CV PBL ILO’s Flashcards

1
Q

Outline potential pathways from psychological arousal to physical symptoms

A

The body releases a surge of hormones when under stress.
These hormones cause the heart to beat faster and the blood vessels to narrow.
These actions increase blood pressure for a time.

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2
Q

Demonstrate knowledge of adherence, including strategies used to enhance adherence to treatment and health advice.

A

Adherence Definition : the extent to which a patients behaviour (i.e. taking medication, lifestyle changes, or following a diet) corresponds with the advice given by a healthcare provider.
Strategies to improve adherence:

Simplifying regimen characteristics
Imparting knowledge
Modifying patients beliefs
Patient communication
Leaving the bias behind
Evaluate adherence

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3
Q

Demonstrate knowledge of the pro-inflammatory effects of smoking on the cardiovascular system

A

• Thrombosis
○ Smoking causes walls of blood vessels to become inflamed -> atherosclerosis
○ Atherosclerotic plaque formed: activated monocytes adhere to site of damaged endothelium -> migrate into sub-endothelium -> differentiate into macrophages -> differentiate into foam cells
Rupturing of plaque -> local vasoconstriction and thrombosis

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4
Q

Demonstrate knowledge of the circulatory system, including the anatomy and histology of arteries and veins

A

The circulatory system has two components: the cardiovascular system and the lymphatic vascular system.

The cardiovascular system is composed of the heart and two separate circuits: the pulmonary circuit that carries deoxygenated blood from the heart to the lungs and oxygenated blood from the lungs to the heart, and the systemic circuit that distributes oxygenated blood from the heart to the rest of the body and returns deoxygenated blood from the tissues of the body to the heart. Blood leaves the heart via vessels that belong to the arterial system , whose members decrease in size the farther away they are from the heart, and return to the heart via vessels that belong to the venous system, whose members increase in size as they approach the heart. The smallest branches of the arterial and venous systems are connected to each other by way of capillaries that form extensive capillary beds .

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5
Q

Anatomy of the heart

A

Heart is found in the thorax between two lungs, to the left of the midline. It is between ribs 2 and 5, the apex of heart is on the midclavicular line in the 5th intercostal space.

Heart layers: Endocardium, myocardium, epicardium

The pericardium covers the heart – it is made of two layers an inelastic fibrous parietal layer and a smooth visceral layer.

The fibrous skeleton of the heart is between the atria and ventricles and stops electrical impulses passing from the atria to the ventricles in an uncontrolled manner. The heart valves are suspended from the fibrous skeleton.

There are two types of heart valve:
1. Atrioventricular valves (AV)
a. Bicuspid (Right AV valve)
b. Tricuspid/mitral (Left AV valve)
2. Semilunar Valves
a. Aortic
b. Pulmonary

Atrioventricular Valves:
• Between atria and ventricles
• Flow of blood opens valve
• Anchored by chordae tendinae to papillary muscles
• Contraction of papillary muscles prevents eversion of valves and prevents back flow of blood into atria

Semilunar Valves:
• Between ventricles and aorta/pulmonary trunk
• Opened by flow of blood due to ventricle contraction
Closed by back flow of blood pooling in valve cusps

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6
Q

What does the left and right coronary artery bifurcate into?

A

Left coronary artery bifurcates into:
• Circumflex
• Anterior interventricular

Right coronary artery bifurcates into:
• Posterior interventricular
Marginal

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7
Q

Name the names of the blood vessels layers:

A

Walls of blood vessels are composed of three separate concentric layers: the tunica intima, tunica media, and tunica adventitia.

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8
Q

Name the three types of arteries:

A

Arteries are of three types: elastic arteries (conducting arteries),

The aorta and the branches originating from the aortic arch (the common carotid artery and the subclavian artery), the common iliac arteries, and the pulmonary trunk are elastic (conducting) arteries

muscular arteries (distributing arteries),

Muscular arteries are characterized by a thick tunica media that is composed mostly of smooth muscle cells. Muscular (distributing) arteries include most vessels arising from the aorta, except for the major trunks originating from the arch of the aorta and the terminal bifurcation of the abdominal aorta, which are identified as elastic arteries.

and arterioles

Arteries with a diameter of less than 0.1 mm are considered to be arterioles.

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9
Q

Veins:

A

Veins are classified into three groups on the basis of their diameter and wall thickness: small, medium, and large.

Venules are similar to but larger than capillaries; larger venules possess smooth muscle cells instead of pericytes. As the blood pools from the capillary bed, it is discharged into small venules ( postcapillary venules )

Medium veins are less than 1 cm in diameter. Medium veins are the ones draining most of the body, including most of the regions of the extremities

Large veins return venous blood directly to the heart from the extremities, head, liver, and body wall. Large veins include the vena cava and the pulmonary, portal, renal, internal jugular, iliac, and azygos veins.

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10
Q

Demonstrate understanding of applications of behavioural theories to weight loss

A

Making specific and small goals to calorie intake, physical activity, and diet.
Calorie deficit
150 minutes of moderate activity per week
Reduce amount of saturated fat and salt and sugar intake

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11
Q

Demonstrate knowledge of the benefits of physical activity in managing hypertension:

A

Strengthens heart- improves its ability. To pump blood around the body with less effort. Decreases force on the arteries
Exercise leads to post exercise hypotension therefore frequent exercise can sustain lower blood pressure.

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12
Q

Demonstrate knowledge of the pathophysiology of hypertension, including management options.

A

Involves the impairment of renal pressure natriuresis, the feedback system in which high blood pressure induces an increase in sodium and water excretion by the kidney that leads to a reduction of the blood pressure.

The principal neuroendocrine mechanisms involved in the regulation of blood pressure. RAAS, natriuretic peptide roles, endothelial dysfunction, sympathetic nervous system (SNS) and the immune system. A disruption in any of these systems can lead to hypertension

Management - https://www.nice.org.uk/guidance/ng136

· Lifestyle interventions:
· Weight management
○ BMI 18.5-24.9 Kg/m2
o Dietary advice, use of slimming clubs
· No more than 14 units alcohol per week
· Reduce salt to 4.4g/day
Exercise – should be enjoyable and part of daily routine

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13
Q

Physiological mechanisms involved in development of essential hypertension

A

Cardiac output
Peripheral resistance
Renin-angiotensin-aldosterone system
Autonomic nervous system

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14
Q

Demonstrate knowledge of the pathophysiology of hypercholesterolaemia in the cardiovascular system.

A

Hypercholesterolaemia -> elevated cholesterol levels in the blood stream.

Cholesterol travels through the blood on two lipoprotein subtypes
• Low density lipoproteins (LDL), ‘bad’ cholesterol, which makes up most of your body’s cholesterol
• High density lipoproteins (HDL), ‘good’ cholesterol, absorbs cholesterol in the blood and flushes it back to the liver.

Pathophysiology
• When the blood has elevated LDL levels, it can lead to the disposition of cholesterol in vascular walls. This creates fatty streaks, which over time become fibrous plaques, this is termed atherosclerosis. This causes narrowing of the arteries at the located site, which restricts blood flow. This increases TPR and causes an increase in BP.
• As the body responds to atherosclerosis it causes inflammation, resulting in the plaques to become unstable, resulting in plaque rupture.
• Some of the material is thus made evident in the blood vessel and into the circulatory system, which can lead to thrombosis.
• This can affect the hearts ability to pump blood sufficiently and if blood clots form in one of the arteries leading to the heart, angina or a heart attack can occur.

Aetiology of hypercholesterolaemia
1. Genetic Causes : familial dyslipidaemia
Secondary : obesity, diet, excessive alcohol intake, hyperthyroidism, diabetes, inflammatory disease, liver disease, nephrotic syndrome, chronic renal failure, medications.

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15
Q

Diagnostic Factors of hypertension:

A

headache
visual changes
dyspnoea
chest pain
sensory or motor deficit

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16
Q

Risk factors of hypertension:

A

obesity
aerobic exercise <3 times/week
moderate/high alcohol intake
metabolic syndrome
diabetes mellitus
black ancestry
age >60 years
family history of hypertension or coronary artery disease
sleep apnoea
sodium intake >1.5 g/day
low fruit and vegetable intake
dyslipidaemia

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17
Q

Demonstrate knowledge of arterial blood pressure and its relationship to cardiac output and peripheral resistance

A

Blood pressure or systemic arterial pressure → pressure measured within large arteries in the systemic circulation

Mean arterial blood pressure = cardiac output x total peripheral resistance
Cardiac output = Heart rate x stroke volume
Therefore any changes in the heart rate or stroke volume can impact on the cardiac output and therefore BP

Peripheral vascular resistance factors:
Blood viscosity
Vessel Length
Vessel Diameter

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18
Q

Describe the health risk from tobacco smoking at the individual and population levels

A

Common health risks include:
· Cancer
· Heart disease
· Stroke
· Lung disease
· Diabetes
COPD which includes emphysema and chronic bronchitis

· CVD – 20% of all deaths from CVS are due to smoking
· Respiratory disease – 40% of all are due to smoking, increases risk of pneumonia and TB
Smoking is the main cause of premature death and preventable illness in the UK

Long term effects of smoking:
Increase risk of cancer
Increase risk of heart attack and heart disease
Increase stroke risk
Increase psoriasis risk
Increase T2 diabetes
Increase osteoporosis risk
Increase mental health problems
Increase risk of vision changes
Increase risk of gum disease
Increase risk of chronic lung disease
Delayed wound healing
Fertility problems

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19
Q

What are the two main types of cells in the heart?

A

Heart has 2 main types of cells:
Conducting cells generate and propagate electrical impulses
Contractile cells contract following receipt of electrical impulses. These cells can also propagate and on occasion generate electrical impulses

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20
Q

Where and what is the AV node?

A

• AVN is a group of specialised cells in atrioventricular septum just above the coronary sinus ostium
• AVN receives electrical impulses from atria and then transmits impulse from the atria to ventricles

Slower conduction velocity (0.05m/sec) than the atria, allowing maximal ventricular filling prior to contraction

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21
Q

Pathophysiology of supraventicular tachycardia.

A

Pathophysiology

· SVT is caused by the electrical signal re-entering the atria from the ventricles.
· Normally the electrical signal in the heart can only go from the atria to the ventricles. In SVT the electrical signal finds a way from the ventricles back into the atria.
· Once the signal is back in the atria it travels back through the AV node and causes another ventricular contraction. This causes a self-perpetuating electrical loop without an end point and results in fast narrow complex tachycardia (QRS < 0.12).
· It looks like a QRS complex followed immediately by a T wave, QRS complex, T wave and so on.
· Paroxysmal SVT describes a situation where SVT reoccurs and remits in the same patient over time.

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22
Q

What are the types of supraventricular tachycardia’s?

A

Atrial Fibrillation
Atrial flutter
Atrioventricular reciprocating tachycardia (AVRT)
Atrioventricular modal re entrant tachycardia (AVNRT)

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23
Q

Understand the non pharmacological reduction of cardio vascular risk factors:

A

Smoking cessation
Control hypertension
Control diabetes
Managing cholesterol
Cardioprotective diet
Avoiding alcohol
Exercise
Managing stress
Maintain healthy weight

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24
Q

What is atrial fibrillation?

A

Atrial fibrillation (AF) is a cardiac arrhythmia characterised by disorganised electrical activity within the atria resulting in ineffective atrial contraction and irregular ventricular contraction.

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25
Q

Causes of atrial fibrillation:

A

• Idiopathic
• Ischaemic heart disease
• Heart failure
• Valve disease: mitral stenosis, mitral regurgitation
• Hypertension
• Hyperthyroidism
• Alcohol induced
Familial

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26
Q

Signs of atrial fibrillation

A

Signs:
• AF is the most common cardiac arrhythmia in adults. The prevalence of AF increases with age, particularly over 65 years, such that 10% of over 85-year-olds have atrial fibrillation.
• The resulting chaotic electrical activity is intermittently conducted through the AVN which gives rise to the characteristic irregularly irregular ventricular rate seen in AF.
• In AF, the ventricular rate is very variable and depends on the speed of AVN conduction. Young patients with slick AV nodes are often very symptomatic and tachycardic.
• The presence of chaotic electrical activity within the atria also results in ineffective atrial contraction. The consequence of this is blood stasis within the atria which increases the chance of thrombosis (Virchow’s triad) and subsequently embolic complications including transient ischaemic attacks (TIA), stroke and systemic embolisation.
• It is most commonly associated with hypertension, obesity and alcohol.
• Irregularly irregular pulse when palpating radial/carotid arteries or auscultating at the apex
Radial-apical deficit: this is important to assess because each ventricular contraction may not be sufficiently strong enough to transmit a pulse to the radial artery and palpating only the radial artery can miss tachycardia.

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27
Q

Symptoms of AF

A

• Can be asymptomatic
• Common presenting symptoms include breathlessness, chest discomfort, palpitations, dizziness, syncope, dyspnoea and reduced exercise tolerance
• Transient ischaemic attack or stroke can be the presenting feature of AF. Essential that patients presenting with symptoms or signs of a TIA or stroke are also asked about the features of AF.
Common ECG finding include irregular RR intervals and absent p-waves

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28
Q

Complications of AF:

A

• Stroke and thromboembolism = MAIN COMPLICATIONS
–> dependent of the presence of stroke risk factors though
–> stroke severity greater when stroke is associated with AF
–> Peripheral thromboembolism can also occur
• Heart failure
–> due to disorganised electrical conduction in atria which results in ineffective ventricular filling
• Tachycardia-induced cardiomyopathy and critical cardiac ischaemia as a result of persistently elevated ventricular rate seen in uncontrolled AF
Sudden death

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29
Q

Atrial Fibrillation rate control treatment:

A

○ Rate Control is first line:
▪ Beta blocker – first line (e.g. atenolol 50-100mg once daily)
▪ Rate limiting CCB – diltiazem hydrochloride / verapamil hydrochloride (not preferable in heart failure)
▪ Digoxin – only as primary treatment in predominantly sedentary / if other rate limiting drugs are unsuitable
○ Used as monotherapies first but if it fails to control rate then use as combination
If combination fails use rhythm control

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30
Q

Atrial Fibrillation rhythm control treatment:

A

○ Rhythm Control Drugs – pharmacalogical cardioversion
▪ Flecainide
▪ Amiodarone (drug of choice if patient has structural heart disease)
○ Long term rhythm control drugs:
▪ Beta blockers – 1st line
▪ Dronedarone – 2nd line, maintain normal rhythm when they’ve had successful cardioversion
▪ Amiodarone – in patients with heart failure or left ventricular dysfunction

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31
Q

What medication is used for paroxysmal supraventricular tachycardia?

A

Adenosine initial 6mg, then 12mg, then further 12mg if no improvement

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32
Q

What is digoxin used for?

A

Slows ventricular response in cases of atrial fibrillation and atrial flutter

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33
Q

What medications are used for supraventricular tachycardia?

A

Verapamil
Hydrochloride

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34
Q

How can you achieve rapid control of ventricular rate?

A

IV Beta blockers e.g. esmolol hydrochloride / propranolol hydrochloride

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35
Q

Describe sinus rhythm.

A

A sinus rhythm is any cardiac rhythm in which depolarisation of the cardiac muscle begins at the sinus node. It is characterised by the presence of correctly oriented P waves on the electrocardiogram

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36
Q

Describe sinus arrhythmia.

A

Sinus arrhythmia is a commonly encountered variation of normal sinus rhythm. Sinus arrhythmia characteristically presents with an irregular rate in which the variation in the R-R interval vary by more than 0.12 seconds

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37
Q

Name types of ventricular tachycardia’s:

A

Ventricular tachycardia
Ventricular fibrillation

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38
Q

Name types of bradycardia.

A

AV Heart Block
Asystole

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39
Q

Supraventricular tachycardia’s:
AV Fibrillation vs AV Flutter

A

Atrial Fibrillation:
Irregularly irregular
Abnormal P Waves
R to R uneven

Atrial Fluter:
P waves = saw tooth
Normal QRS
R to R can be even or uneven
Typically 2 or more P waves for every QRS

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40
Q

Supraventricular tachycardia’s:
Atrioventricular nodal re entrant tachycardia (AVNRT) vs Atrioventricular reciprocating tachycardia (AVNT)

A

AVNRT
Originates above the level of the bundle of His
Commonest cause of heart palpitations in patients with no structural abnormality
Slow Fast (Common) P waves often hidden being embedded in QRS complex
Fast Slow (Uncommon) P waves are visible between the QRS and T wave

AVRT: Rate usually 200-300bpm
Orthodromic: Retrograde P waves are usually visible with a long RP Interval
Antidromic: (Rare) Wide QRS complexes due to abnormal ventricular depolarisation

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41
Q

Types of ventricular tachycardia:

A

Ventricular tachycardia
Ventricular fibrillation

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42
Q

Describe ventricular tachycardia:

A

Originates from the ventricles
Several different forms - most common monomorphic VT

ECG Features:
Regular broad QRS Complexes

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43
Q

Describe ventricular fibrillation:

A

Most important shockable cardiac arrest rhythmFatal unless life support is rapidly used

ECG:
Chaotic irregular deflections or varying amplitude
No identifiable P waves, QRS complex, or T waves
Rate 150 to 500 bpm

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44
Q

Name types of bradycardia:

A

AV Heart Block- First Degree Heart Block, Second Degree heart Block type 1 and 2, Third degree heart block
Asystole

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45
Q

Describe heart block

A

Arrhythmia where signal delayed or blocked in the conduction system due to damage or fibrosis

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46
Q

First degree heartblock:

A

PR Interval > 200ms five small squares
There is delay without interruption in conduction from atria to ventricles

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47
Q

Second degree heart block:

A

Type 1 - Mobitz 1 block (Wenckeback Phenomenon)
Progressive prolongation of the PR Interval

Type 2 - Mobitz 2 (Hay Block)
A form of 2nd degree AV Block in which there is intermittent non- conducted p waves without progressive prolongation of the PR Interval

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48
Q

Third degree heart block

A

Single blocked completely
Not shockable in cardiac arrest
Symptoms : syncope, confusion, dyspnea, severe chest pain
Risk of dying

ECG:
Severe bradycardia due to absence of AV conduction
AV Dissociation with independent atrial and ventricular rates

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49
Q

Describe Asystole

A

Flatline
Represents the cessation of electrical and mechanical activity of the heart
Not a shockable rhythm

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50
Q

Aetiology of atrial fibrillation

A

• The cause is unknown BUT:
• Any condition that leads to inflammation, stress, damage, or ischemia affecting the anatomy of the heart can result in the development of atrial fibrillation.

• Electrically active foci within the pulmonary veins.

• Electrical remodeling in the cardiac myocytes causing dilated cardiomyopathy

• Failure of initiation of pharmacological intervention or failure of cardioversion.

• Unresponsive rhythm

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51
Q

What are palpitations or only caused by?

A

Palpitations are most commonly caused by:

Atrial or ventricular extrasystoles (PACs or PVCs) - additional heartbeats that occur outside the physiological heart rhythm).

Narrow QRS complex tachycardia (heart rate more than 100 beats per minute, QRS duration of less than 120 milliseconds).

Atrioventricular nodal reentry tachycardia (AVNRT) is the most common type of supraventricular tachycardia (SVT).

Wolff-Parkinson-White (WPW) syndrome is a condition that makes the heart suddenly beat abnormally fast, in an abnormal heart rhythm called SVTs - short PR intervals.

Atrial fibrillation or flutter.

Also caused by non cardiac related problems: psychiatric disorders and miscellaneous (i.e. Hyperthyroidism, alcohol)

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52
Q

How do you assess a patient experiencing palpitations?

A

Assessment of a person who currently has palpitations involves:

Checking for symptoms suggestive of a serious cause or complication, such as breathlessness, chest pain, syncope or near syncope (fainting).

Checking for a history of ischaemic heart disease, heart failure, cardiomyopathy, or valve disease, which could predispose to a serious arrhythmia.

Asking about sudden cardiac death of a relative younger than 40 years of age.

Examining the person’s heart rate and rhythm, blood pressure, and identifying any heart murmurs or lung crepitations - ensure haemodynamic stability.

	○ Duration of palpitations -instant vs minutes 
	
	○ HR and rhythm regularity – describe the rate + regularity to me - tap it out. 

Taking an ECG immediately.

Lab tests - thyroid function test

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53
Q

Cardiac causes of palpitations:

A

Cardiac causes:

• Underlying structural heart disease (cardiomyopathy - disease of the heart muscle) 

• Identifiable conduction abnormality (long QT syndrome - heart signalling disorder)

• Tachyarrhythmias, bradyarrhythmias, ectopic beats

• Valvular heart disease (mitral valve prolapse - valve flaps of the mitral valve don't close smoothly or evenly)

• Pacemaker syndrome (AV dyssynchrony due to single chamber pacing)

• Atrial myxoma (nonca)ncerous tumor in the atria)

High output cardiac states (resting cardiac output greater than 8 L/min

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54
Q

How to distinguish between causes of heart palpitations:

A

Supraventricular tachycardia - SVT
Atrioventricular nodal reentry tachycardia - AVNRT
Atrioventricular reentrant tachycardia - AVRT
SINCE CHILDHOOD

Paroxysmal supraventricular tachycardia - pSVT
Atrial tachycardia
Atrial fibrillation - AF
OLDER PATIENTS

Premature ventricular contractions - PVCs
Complete heart block
Ventricular tachycardia - VT
POUNDING IN NECK

Atrial fibrillation - AF
Supraventricular arrhythmia
FLUTTERING

Supraventricular tachycardia - SVT
Atrial fibrillation - AF
Flutter
PRESYNCOPE/SYNCOPE

Supraventricular tachycardia - SVT
Ventricular tachycardia - VT
ABRUPT ONSET AND TERMINATION

Atrioventricular nodal reentry tachycardia - AVNRT
MORE AWAR OF PALPITATIONS ONCE STANDING AFTER SITTING

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55
Q

What are rate medications used for in AF and give some examples and their side effects:

A

Rate Control medications:
Reduce heart rate to less than 90bpm when resting
Eg Beta Blockers (atenolol, bisoprolol)
Calcium. Channel Blockers (Verapamil, diltiazem)
Digoxin may be prescribed if other drugs are unsuitable

Side effects:

• beta blockers – tiredness, cold hands and feet, low blood pressure, nightmares and impotence
• verapamil – constipation, low blood pressure, ankle swelling and heart failure
Digoxin – arrythmias, cardiac conduction disorder, cerebral impairment, diarrhoea, dizziness, eosinophillia, nausea, skin reactions, vision disorders, vomiting

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56
Q

What are rhythm medications used for in AF and give some examples of medications and their side effects:

A

Rhythm control medications:
Restore normal heart rhythm

Flecainide, beta blockers (particularly sotalol)

Side effects:
beta blockers – tiredness, cold hands and feet, low blood pressure, nightmares and impotence
flecainide – feeling sick, being sick and heart rhythm disorders

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57
Q

Why are anticoagulations used in atrial fibrillation

A

Reduce the chance of blood clots forming and casing a stroke

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58
Q

Rationale for anticoagulation choice in atrial fibrillation:

A

Rationale for anticoagulation choice in atrial fibrillation:
• Pregnancy – warfarin can affect the unborn baby, apixaban, dabigatran, edoxaban and rivaroxaban are also not recommended during pregnancy. Heparin injections can be given while pregnant
• Breastfedding – warfarin is usually ok while breastfeeding, heparin is safe while breastfeeding. Apixaban, dabigatran, edoxaban and rivaroxaban aren’t recommended if you’re breastfeeding because it’s not clear if they’re safe for the baby.
• Sports/avoiding injury – anticoagulant medicines can make you more prone to bleeding if you are injured
• Interactions with other medicines and remedies – prescription medicines, over the counter medicines and herbal remedies (St Johns Wort)
Food and drink – important to have a healthy, balanced diet if taking anticoagulants and you should avoid making frequent changes to the amount of green vegetables/foods high in vitamin K you eat if you are taking warfarin. Warfarin is affected by alcohol but the restrictions don’t usually apply if taking apixaban, dabigatran, edoxaban or riaroxaban

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59
Q

What is cardio version?

A

Cardioversion may be recommended for some people with atrial fibrillation.
It involves giving the heart a controlled electric shock to try to restore a normal rhythm.
Cardioversion is usually carried out in hospital so the heart can be carefully monitored.
If you have had atrial fibrillation for more than 2 days, cardioversion can increase the risk of a clot forming.
In this case, you’ll be given an anticoagulant for 3 to 4 weeks before cardioversion, and for at least 4 weeks afterwards to minimise the chance of having a stroke.
In an emergency, pictures of the heart can be taken to check for blood clots, and cardioversion can be carried out without going on medicine first.
Anticoagulation may be stopped if cardioversion is successful.
But you may need to continue taking anticoagulation after cardioversion if the risk of atrial fibrillation returning is high and you have an increased risk of having a stroke.

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60
Q

What is catheter ablation?

A

Catheter ablation is a procedure that very carefully destroys the diseased area of your heart and interrupts abnormal electrical circuits.
It’s an option if medicine has not been effective or tolerated.
Catheters (thin, soft wires) are guided through one of your veins into your heart, where they record electrical activity.
When the source of the abnormality is found, an energy source, such as high-frequency radio waves that generate heat, is transmitted through one of the catheters to destroy the tissue.

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61
Q

What is a pacemaker?

A

A pacemaker is a small battery-operated device that’s usually implanted in your chest, just below your collarbone.
It’s usually used to stop your heart beating too slowly, but in atrial fibrillation it may be used to help your heart beat regularly.
Having a pacemaker fitted is usually a minor surgical procedure carried out under a local anaesthetic (the area being operated on is numbed and you’re conscious during the procedure).
This treatment may be used when medicines are not effective or are unsuitable. This tends to be in people aged 80 or over.

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62
Q

NICE GUIDELINES for AF:

A

NICE GUIDELINES

Personalised package of care and information
1.4.1 Offer people with atrial fibrillation a personalised package of care. Ensure that the package of care is documented and delivered, and that it covers:
• stroke awareness and measures to prevent stroke
• rate control
• assessment of symptoms for rhythm control
• who to contact for advice if needed
• psychological support if needed
• up-to-date and comprehensive education and information on:
- cause, effects and possible complications of atrial fibrillation
- management of rate and rhythm control
- anticoagulation
- practical advice on anticoagulation in line with the recommendations on information and support for people having anticoagulation treatment in NICE’s guideline on venous thromboembolic diseases
1.4
- support networks (for example, cardiovascular charities). [2014] 1.4.2 Follow the recommendations in NICE’s guideline on shared decision
making. [2014]

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63
Q

What are the steps if unstable acute AFib was detected in the first 48 hours?

A

Cardioversion
Followed by Amiodarone

64
Q

Treatment for AFib if it is uncertain or has been longer than 48 hours.

A

Perform a transeosophageal to check for atrial thrombus or start a course of anticoagulation egheparin to ensure thrombolysis
Once patient is no longer at a stroke risk, proceed to antiarrythmic drugs for mono therapy. If patient doesn’t respond consider a combination of 2 antiarrythmic drugs

65
Q

Treatment plan for supraventricular tachycardias:

A

Supraventricular Tachycardias
1. Valsalva maneouvre – ask patient to blow hard + fast against resistance
2. Carotid sinus massage – massage carotid on ONE SIDE gently
3. Adenosine
4. Verapamil (CCB)
5. Electrical cardioversion (if above treatment fails)
• Long term management
○ Medication = beta blockers, CCB, or amiodarone
Radiofrequency ablation

66
Q

Name 3 types of acute coronary syndrome

A
  1. Unstable Angina - symptoms come on randomly whilst at rest
    ○ Insufficient oxygen delivery to the heart muscle leading to ischaemia
    1. ST Elevation Myocardial Infarction (STEMI) -ST elevation or new left bundle branch block (occurs when something blocks or disrupts the electrical impulse that causes your heart to beat)
      ○ A STEMI is the most serious type of heart attack where there is a long interruption to the blood supply.
    2. Non-ST Elevation Myocardial Infarction (NSTEMI) - no ST elevation, raised troponin levels and other ECG changes (ST depression or deep T wave inversion or pathological Q waves)
      A NSTEMI is a type of involving partial blockage of one of the coronary arteries, causing reduced flow of oxygen-rich blood to the heart muscle.
67
Q

Management of acute STEMI

A

Patients with STEMI presenting within 12 hours of onset should be discussed urgently with local cardiac centre for either:

• Initial drug therapy
	○ Offer people with acute STEMI a single loading dose of 300-mg aspirin as soon as possible unless there is clear evidence that they are allergic to it.


• Primary PCI (if available within 2 hours of presentation)
	○ Percutaneous Coronary Intervention (PCI) involves putting a catheter into the patient’s brachial or femoral artery, feeding that up to the coronary arteries under xray guidance and injecting contrast to identify the area of blockage. This can then be treated using balloons to widen the gap or devices to remove or aspirate the blockage. Usually a stent is put in to keep the artery open.
	

• Thrombolysis (if PCI not available within 2 hours) Thrombolysis involves injecting a fibrinolytic medication (they break down fibrin) that rapidly dissolves clots
68
Q

Treatment for a NSTEMI

A

B – Beta-blockers unless contraindicated

A – Aspirin 300mg stat dose

T – Ticagrelor 180mg stat dose (clopidogrel 300mg is an alternative if higher bleeding risk)

M – Morphine titrated to control pain

A – Anticoagulant: Fondaparinux (unless high bleeding risk)

N – Nitrates (e.g. GTN) to relieve coronary artery spasm

69
Q

Secondary prevention management for STEMI and NSTEMI

A

Secondary Prevention Medical Management for STEMI and nSTEMI
6 A’s
A – Aspirin
A - Another antiplatelet (ticagrelor or clopidogrel)
A – Atorvastatin
A – ACE inhibitors
A - Atenolol (beta-blocker)
A – Aldosterone antagonist (clinical heart failure)

70
Q

What is atheroma?

A

Fatty material that builds up inside your arteries. Made of cholesterol, protein and other substances.

71
Q

What is a thrombus?

A

Occurs when blood clots block veins/arteries, preventing the correct flow of blood.

72
Q

Describe atherosclerosis:

A

Atherosclerosis
• Atherosclerosis is a combination of atheromas (fatty deposit in the artery walls) and sclerosis (process of hardening or stiffening of blood vessel walls)
• Affect medium and large arteries
• Caused by chronic inflammation and activation of the immune system in the artery wall
• The lipid deposits and inflammatory reaction to atherosclerosis by macrophages causes the development of atheromatous plaques
• These plaques causes:
○ Stiffening of artery walls → leading to hypertension
○ Stenosis (narrowing) → leading to a reduced blood flow (e.g. in angina)
Plaque rupture can give of a thrombus that blocks a distal vessel → may lead to ischaemia

73
Q

Describe thrombosis:

A

• Thrombosis is the formation of a blood clot (partial or complete blockage) within blood vessels.
• Arterial thrombosis typically initiates by the accumulation of lipid plaques in the arterial wall, provoking chronic inflammatory cell and platelet activation.
○ Platelets play a significant role in development of arterial thrombosis → explains why antiplatelet agents form cornerstone of prevention/treatment
• Initial lipid plaques evolve into fibrous plaques. Fibrous plaque could rupture and erosion of the surfaces of some of these plaques could lead to release of additional pro-coagulating factors → atherosclerosis
Atherosclerosis allows activation of platelets, causing adhesion ad aggregation, leading to formation of clot.

• Thrombosis occurs when the plaque rupture gives off a thrombus which travels down  the artery to a distal vessel and causes a blockage in either one of the arteries of veins.  Thrombosis is a main cause of myocardial infarction as the blockage can reduce blood supply to the heart. Myocardial infarction in this case can be secondary to ischaemia as the blockage decreases blood flow and thus oxygen to the heart muscle.
74
Q

How can you calculate a regular heart rate on an ECG:

A

Count the number of large squares present within one R to R interval and divide 300 by the number

75
Q

How can you calculate an irregular heart rate rhythm on an ECG:

A

o Count the number of complexes on the rhythm strip (each rhythm strip is typically 10 seconds long)
Multiply the number of complexes by 6 (giving you the average number of complexes in 1 minute)

76
Q

Describe the waves and complexes of an ECG:

A

o P wave: depolarisation of atria (small amplitude)
o P-R interval: time for conduction through AV node, bundle of His, Purkinje fibres (time from onset of atrial depolarisation to onset of ventricular depolarisation)
o QRS complex: ventricular depolarisation (usually represent left ventricle)
§ Q wave: any initial negative deflection
§ R wave: any positive deflection
§ S wave: any negative deflection after R
o ST segment: end of ventricular depolarisation to beginning of repolarisation
o QT interval: total time for depolarisation and repolarisation of the ventricles
T wave: ventricular repolarisation

77
Q

What is angina?

A

A narrowing of the coronary arteries reduces blood flow to the myocardium (heart muscle). During times of high demand such as exercise there is insufficient supply of blood to meet demand. This causes symptoms the symptoms of angina, typically constricting chest pain with or without radiation to jaw or arms.
• Angina is “stable” when symptoms are always relieved by rest or glyceryl trinitrate (GTN).
• It is “unstable” when the symptoms come on randomly whilst at rest, and this is considered as an Acute Coronary Syndrome

78
Q

Pathophysiology of angina:

A

The pathophysiology of angina
• Angina is caused by reduced blood flow to the heart muscle.
• Blood carries oxygen, which the heart muscle needs to survive.
When the heart muscle isn’t getting enough oxygen, it causes ischemia.

Angina often results from ischemic episodes that excite chemo sensitive and mechanoreceptive receptors in the heart.
• Ischemic episodes release chemicals such as adenosine and bradykinin, that excites the receptors of the sympathetic and vagal afferent pathways.
• Sympathetic afferent fibers from the heart enter the upper thoracic spinal cord and synapse on cells of origin of ascending pathways.
• Excitation of spinothalamic tract cells in the upper thoracic and lower cervical segments, except C7 and C8 segments, contributes to the anginal pain experienced in the chest and arm.
Cardiac vagal afferent fibers synapse in the medulla and then descend to excite upper cervical spinothalamic tract cells. This innervation contributes to the anginal pain experienced in the neck and jaw.

79
Q

What is ischemia?

A

Ischemia is a condition in which blood flow (and thus oxygen) is restricted or reduced in a part of the body. Cardiac ischemia is decreased blood flow and oxygen to the heart muscle.

80
Q

What is referred pain?

A

Pain received in a region other than the site of the painful stimulus

81
Q

What is cardiac failure and what are the three causes of cardiac failure?

A

Cardiac failure is when the cardiac output is not sufficient to meet the body’s metabolic demands.
Pump Failure (systolic failure - can’t pump enough blood despite normal filling of he heart)
Excessive preload
Excessive afterload

82
Q

What is ejection fraction and how is it calculated?

A

Ejection fraction is the proportion of blood present at the end of diastole that is ejected from the ventricle during contraction.

EF = EDV – ESV
EDV

Normal is considered as >0.5 (50-60%)

83
Q

What is cardiac preload and what is the problem when it becomes excessive?

A

CARDIAC PRELOAD : when the cardiac muscle is stretched (more blood enters the ventricle) the muscle contracts with greater force so that the heart can pump extra blood out. Another name for this is left ventricular end-diastolic pressure.
Thus cardiac pre load directly influences stroke volume.

Excessive preload increases stroke volume to a certain point but after this it leads to increased hydrostatic pressure in the pulmonary capillaries and contributes to pulmonary oedema.
Additionally excessive preload causes ventricular remodelling (dilation) which can reduce the ventricles elasticity as they become thin and weak thus impacting myocardial function, leading to a reduction in stroke volume ejected from the LV into the aorta.
This is the primary cause of systolic heart failure.

84
Q

What is cardiac after load and what is the problem when it becomes excessive?

A

CARDIAC AFTERLOAD -> the pressure exerted against the heart which it must overcome to be able to contract to eject blood from the ventricle
Also known as systemic vascular resistance (SVR)
Excessive afterload leads to ventricular remodelling (hypertrophy), the thickening of the ventricular walls to withstand the pressure which overtime results in diastolic dysfunction and congestive heart failure.
This is diastolic heart failure.

85
Q

Describe left ventricular failure

A

Definition: dysfunction of the left ventricle, resulting insufficient delivery of blood to vital organs.

86
Q

Explain left ventricular failure.

A

LVF causes a backlog of blood (like too many buses waiting to pick up people at a bus stop) that increases the amount of blood stuck in the left atrium, pulmonary veins and lungs. As the vessels in these areas are engorged with blood due to the increased volume and pressure they leak fluid and are unable to reabsorb fluid from the surrounding tissues. This causes pulmonary oedema, which is where the lung tissues and alveoli become full of interstitial fluid. This interferes with the normal gas exchange in the lungs, causing shortness of breath, oxygen desaturation and the other signs and symptoms.

87
Q

What are the two types of left ventricular heart failure?

A

There are two types of left ventricular heart failure:
1) Heart failure with reduced ejection fraction (HFrEF) - the left ventricle loses its ability to contract normally
2) Heart failure with preserved ejection fraction (HFpEF) - the left ventricle loses its ability to relax normally

88
Q

Describe chronic heart failure:

A

Chronic heart failure is essentially the chronic version of acute heart failure. It is caused by either impaired left ventricular contraction (“systolic heart failure”) or left ventricular relaxation (“diastolic heart failure”). This impaired left ventricular function results in a chronic back-pressure of blood trying to flow into and through the left side of the heart.

89
Q

Describe right ventricular failure/ Cor Pulmonale

A

Definition: a condition that causes the right side of the heart to fail.

Cor pulmonale is right sided heart failure caused by respiratory disease. The increased pressure and resistance in the pulmonary arteries (pulmonary hypertension) results in the right ventricle being unable to effectively pump blood out of the ventricle and into the pulmonary arteries. This leads to back pressure of blood in the right atrium, the vena cava and the systemic venous system.

Right ventricular heart failure usually occurs as a result of left-sided failure.

90
Q

What is congestive or bi ventricular failure?

A

Definition: a combination of left-sided and right-sided heart failure. It involves both sides of the heart, and can cause a mix of both types of symptoms.

91
Q

How is heart failure classified?

A

Classification of heart failure is by severity. The most commonly used classification is the New York Heart Association functional classification (https://www.heart.org/en/health-topics/heart-failure/what-is-heart-failure/classes-of-heart-failure).

92
Q

What are the management steps of chronic heart failure?

A

Offer diuretic for congestive symptoms and fluid retention.
To relieve symptoms of fluid overload:
· Prescribe diuretic e.g. furosemide
· Titrate the dose up/down according to symptoms
· Review the dose and adjust as necessary after introducing other drug treatments for heart failure
· Monitor renal function and serum electrolytes (before starting treatment, 1-2 weeks after starting treatment, after each dose increase) U+Es need to be monitored closely

To reduce morbidity and mortality prescribe:
· ACE inhibitor AND a beta blocker
· AIIRA considered in patient develops intolerable side effects to ACE inhibitor
*ACE avoided in those with valvular heart disease until indicated by specialist

First line medical treatment - ABAL
· ACE inhibitor (e.g. ramipril titrated as tolerated up to 10mg once daily)
· Beta Blocker (e.g. bisoprolol titrated as tolerated up to 10mg once daily)
· Aldosterone antagonist when symptoms not controlled with A and B (spironolactone or eplerenone) (and there is a reduced ejection fraction) – MRA drugs
· Loop diuretics improves symptoms (e.g. furosemide 40mg once daily

93
Q

How are ACE Inhibitors used to manage heart disease?
Name types of ACE Inhibitors and what is the alternative if patient isn’t tolerable of ACE inhibitors?

A

ACE inhibitors (ACEi)
E.g. Ramipril, lisinopril

  • Decrease symptoms, slow disease progression, and prolong life in heart failure
  • Most appropriate vasodilators – lower BOTH arterial and venous resistance

Angiotensin II receptor antagonist (A2RA)
E.g. Candesartan, losartan

  • Can be given if ACE inhibitors not tolerated
94
Q

Name examples and how do aldosterone antagonists (MRA) work in managing heart failure?

A

Aldosterone antagonists (MRA)
E.g. spironolactone, eplerenone

  • Block activity of aldosterone, an adrenal cortex hormone that causes sodium retention
  • Recommended in patients with NYHA class II to IV heart failure and those with LVEF of 35% or less unless contraindicated
  • Can cause hyperkalaemia
95
Q

Name examples and how do beta blockers work in heart failure management?

A

Beta blockers
E.g. bisoprolol, carvedilol and nebivolol (licenced for heart failure in the UK)

  • Long term – improve survival of stable patients with heart failure by blocking damaging effects of overactive sympathetic activity
  • Patients with heart failure with reduced ejection fraction should be offered this
96
Q

Name some loop diuretics and how do they work in symptom relief of heart failure?

A

(Loop) Diuretics
E.g. furosemide, bumetanide, torasemide

  • Reduce preload to reduce ventricular filling
  • Improve pulmonary vascular congestion by decreasing filling pressures
  • Inhibit sodium-potassium-chloride cotransporter
  • Leads to diuresis and natriuresis
  • Can be given as IV or Oral
97
Q

Name some thiazide diuretics and how do they work in symptom relief of HF?

A

(Thiazide diuretics)
E.g. Bendroflumethiazide, indapamide, metolazone, chlorthalidone

  • Added in addition to loop diuretics to potentiate their action
  • Inhibit sodium-chloride transporter in distal tube
  • Oral only
98
Q

How does Digoxen help to manage HF?

A
  • Increases force of heartbeat and decreases heart rate
  • Induces an increase in intracellular sodium that will drive an influx of calcium in the heart, increase in contractility
  • When added to ACEi, beta blockers, and diuretics – reduce symptoms, prevent hospitalisation, control rhythm, and enhance exercise
99
Q

When are Isosorbide dinitrate & hydralazine used in HF patients?

A

Isosorbide dinitrate & hydralazine

  • Can be used as an alternative vasodilator, where ACEi and A2RA not tolerated
100
Q

When is Ivabradine used in patients with HF?

A

Ivabradine
*Recommended in the UK in those with symptomatic heart failure with reduced ejection fraction (class II to IV)

  • Slows heart rate – look for bradycardia
101
Q

Entresto – Sacubitril / Valsartan

A

Used for patients with HF
Entresto – Sacubitril / Valsartan

  • Valsartan reduces blood vessel tightening and build-up of sodium and fluid
  • Sacubitril – only found in Entresto, relax blood vessel, and decrease sodium and fluid in the body
102
Q

Inotropes

A

Inotropes
Used in HF patients

  • Increase cardiac contractility, improving cardiac output
103
Q

Dapagliflozin and Empagliflozin

A

Dapagliflozin and Empagliflozin
*Diabetic medications used for heart failure

  • Used as an ‘add-on’ to ACE, ARBs, MRAs
  • Helps to remove fluid from body
104
Q

Name some ECG findings associated with HF.

A

ECG findings associated with heart failure include:
• Tachycardia
• Atrial fibrillation (due to enlarged atria)
• Left-axis deviation (due to left ventricular hypertrophy)
• P wave abnormalities (e.g. P.mitrale/P.pulmonale due to atrial enlargement)
• Prolonged PR interval (due to AV block)
• Wide QRS complexes (due to ventricular dyssynchrony)

105
Q

How is an echocardiography used for HF diagnosis?

A

Echocardiography
All patients with suspected chronic heart failure should undergo transthoracic echocardiography, with the urgency determined by their NT-proBNP level.
An echocardiography is an ultrasound of the heart. It gives an accurate picture of the valves and chambers of the heart, and also gives an idea of the velocity of blood flow in certain areas thus helping you to determine if there is backflow / reduced flow in valve defects.
Each valve is independently assessed, and noted whether there is any regurgitation or stenosis. If present, these are usually given a rating of mild, moderate or severe.

106
Q

NT-proBNP

A

NT-proBNP
N-terminal pro-B-type natriuretic peptide (NT-proBNP) should be measured in all patients presenting with symptoms and clinical signs of heart failure to inform the type and urgency of further investigations such as echocardiography:
· NT-proBNP level >2000 ng/L – refer urgently for specialist assessment and transthoracic echocardiography within 2 weeks
· NT-proBNP level 400-2000ng/L – refer routinely for specialist assessment and transthoracic echocardiography within 6 weeks
· NT-proBNP level <400 ng/L – heart failure unlikely

107
Q

How is a cardiac MRI used in HF diagnosis?

A

Cardiac MRI is the gold standard investigation for assessing ventricular mass, volume and wall motion. It can also be used with contrast to identify infiltration (e.g. amyloidosis), inflammation (e.g. myocarditis) or scarring (e.g. myocardial infarction). It is typically used when echocardiography has provided inadequate views.

108
Q

Typical chest X-ray findings associated with CHF include:

A

Typical chest X-ray findings associated with CHF include: ABCDE
• Alveolar oedema (perihilar/bat-wing opacification)
• Kerley B lines (interstitial oedema)
• Cardiomegaly (cardiothoracic ratio >50%)
• Dilated upper lobe vessels
• Effusions (e.g. pleural effusions – blunted costophrenic angles)

109
Q

What is the mitral valve?

A

The mitral valve is the valve separating the left atrium from the right atrium (sometimes known as the bicuspid valve).

110
Q

What is mitral valve disease?

A

Mitral valve disease is split into mitral regurgitation and mitral stenosis:

Mitral Regurgitation- Mitral Valve doesn’t close completely therefore causing blood to re enter the left atrium
Mitral Stenosis- During diastole the valve doesn’t open completely meaning blood can’t flow from the atrium to the ventricles efficiently

111
Q

What is mitral stenosis and what are common causes?

A

Mitral Stenosis (happens during diastole):
The valve becomes fibrotic or calcified causing the flow from the left atrium to left ventricle to be hindered.

Causes:
Most often caused by rheumatic heart disease - auto antibodies are produced which attack and inflate the mitral valve.
(Rheumatic heart disease can also result in mitral regurgitation, aortic stenosis and regurgitation)
Calcium deposition in the Elderly
End stage renal disease due to increase Calcium
Carcinoid syndrome (more likely in tricuspid but can occur in mitral)

112
Q

What is mitral regurgitation and what are common causes?

A

Mitral Valve Regurgitation (happens during systole):

Causes:
Most common cause is mitral valve prolapse: This is when the valve leaflets and papillary muscles and chordae tendinae are weakened (myxomatous degeneration) causing the valve to not fully shut during systole creating a back flow of blood from left ventricle to atrium.
Why this happens is not fully understood but often connected with connective tissue disorders such as Marfan Syndrome and Ehlers Danilo’s syndrome.

Infective endocarditis- bacteria destroys the valves
Rheumatic heart disease
Previous Myocardial Infarction (can cause destruction of papillary muscles)

Secondary causes (not due to the valve leaflet, chordae tendinae or papillary muscles):
Atrial regurgitation
Systolic heart failure
Hypertrophic obstructive cardiomyopathy

Acute mitral regurgitation is a haemodynamic emergency and can be caused by:
Infective endocarditis
Papillary rupture

-Others are most likely to be chronic

113
Q

Diagnosis of mitral stenosis:

A

Mitral Stenosis:

Listening:
On the Left 5th Intercostal Space mid clavicle listen for a diastolic heart murmur

ECG:
ECG but only visible if they have left atrial enlargement (large P wave shaped as an M on V2)
They are high risk of AF so check for AF on ECG
High risk of right ventricular hypertrophy (R wave greater than S wave in V1-V3) - due to increased pulmonary pressure

CXR:
Blood backing up in the lungs - pulmonary oedema
Left atrial enlargement causing left bronchus to lift superiorly

Echo: Most Important
Actually diagnoses Mitral Stenosis as well as severity
-The larger the left atrial diameter, the worse the mitral stenosis
-Look for left atrial thrombus
-Able to measure the mitral valve area (normal is 4-6cm2, moderate <2cm2, severe <1cm2). The smaller the mitral valve area, the higher the pressure would be in the left atrium (mean pressure gradient- also measurable >10mmHg is bad)

114
Q

Diagnosis of mitral regurgitation:

A

Mitral Regurgitation:

Listening:
On the Left 5th Intercostal Space mid clavicle listen for a pansystolic murmur- these murmurs will increase during expiration or any instance of increase venous return (squatting/ leg raises)

ECG:
Same as mitral stenosis

CXR:
Same as mitral stenosis

Echo: Most important
-Regurgitation fraction (>50% = pretty bad)
-Regurgitation jet wave (area) (>0.7cm = pretty bad)
-Left ventricular end systolic diameter (>40mm = pretty bad)
-Ejection Fraction ( < 60% = pretty bad as leading to HF)

115
Q

Treatment for mitral valve disease:

A

Mitral Valve Disease:

If it has lead to Heart Failure treat this first:
Fluid + Sodium restriction
Diuretics
ACE Inhibitors
Beta Blockers

If patient has atrial fibrillation also treat this first:
Anticoagulants- warfarin
Rate and Rhythm Control drugs

Mitral Stenosis:
P.M.B.C - a balloon which opens up the valve (preferred treatment)
Asymptomatic + Severe MVA <1cm2
Symptomatic + Moderate MVA <1.5cm2
ContraIndications of PMBC - large amount of calcification on the valve

If this doesn’t work or large amount of calcification do a Valve replacement:
Mechanical Valve (need anticoagulants forever - so will have to have low bleeding risk)
Bioprosthetic Valve (only lasts about 10 years- give to older/high bleeding risk patients)

Mitral Regurgitation:
Acute Mitral Regurgitation - CV EMERGENCY
Treat severe pulmonary oedema first:
BIPAP
Diuretics
Treat hypOtension as may cause cardiogenic shock:
Inotropes (to increase SV)
Afterload reducers to drop the pressure in the aorta to increase CO and blood pressure
Intraaortic balloon pump

Once this is stabilised get straight to surgery and replace valve ASAP.

Chronic Mitral Regurgitation:
Regular check ups to measure:
LVESD > 40mm
If they have secondary mitral Regurgiation and have failed medical therapy (HF treatment)
If LVEF is less than 60%
Will often get a valve replacement

116
Q

Pathophysiology of cardiac failure:

A

Pathophysiology
• Inability of the heart to maintain adequate cardiac output
• Preload = influenced by venous return and filling time
• Afterload = influenced by vascular resistance and valvular disease
• Contractility = influenced by myocardial strength and the autonomic nervous system

1. When the heart is failing there is an increase in end-systolic volume (amount of blood left in the heart after contraction) this results in a decreased ejection fraction
2. Increased ESV -> increased stretch
3. In a failing heart this causes a reduction in CO (due to the Frank-Starling principle)
4. Body compensates for decreasing CO by:
	a. Increasing preload
	b. Increasing heart rate
	c. Activation of RAAS Activation of sympathetic nervous system
117
Q

Name some causes of cardiac failure:

A

• Causes:
Ischaemic heart disease
Valvular heart disease (commonly aortic stenosis)
Hypertension
Arrhythmias (commonly AF)

118
Q

Signs and Symptoms of cardiac failure:

A

Signs + Symptoms

Symptoms
• Breathlessness (worsened by exertion)
• Cough - this may produce frothy white/pink sputum
• Orthopnoea
• Paroxysmal nocturnal dyspnoea
○ Sudden waking in the night with severe shortness of breath + cough
○ Caused by:
§ Fluid settling across large area of lung as they’re supine
§ Respiratory centre of brain is less responsive .: resp rate and effort doesn’t increase in response to decreased O2 levels
§ Less adrenalin circulating in sleep .: myocardium is more relaxed .: worsens CO
• Peripheral oedema (ankles, pulmonary, sacrum)

Signs
• Raised JVP
○ Due to increased CVP
• Displaced apex
• Crackles
○ Due to pulmonary oedema
• Ankle swelling
• Heart sounds S3/S4
• Pulsus alternans
• Hepatomegaly
○ Backup of blood in the liver due to increased preload
• Ascites
○ Swelling in the abdomen, such as GI tract and liver

119
Q

Pathophysiology of rheumatic disease

A

Pathophysiology
• Develops 1-5 weeks after initial infection with group A beta-haemolytic streptococci, AKA Streptococcus pyogenes, a gram-positive organism
• Initial Streptococcus pyogenes infection typically manifest a pharyngitis (strep throat) but may present in skin infection (i.e. cellulitis)
• Rheumatic fever develops in susceptible hosts due to a hypersensitivity reaction against the bacteria. This type 2 sensitivity reaction causes the immune system to attack cells throughout the body.

120
Q

Diagnosis of rheumatic disease:

A

To establish diagnosis there must be:
• Evidence of recent group A Streptococcus infection:
○ Positive throat swab
○ Positive rapid streptococcal antigen test
○ Raised streptococcal antibody titre (ASO or DNAse B titres)
○ Recent episode of scarlet fever
• Plus either:
○ Two major criteria
○ Or one major criterion and two minor criteria
Major criteria:
• Polyarthritis
○ Multiple joints affected. Become red, hot and swollen
○ Described as ‘flitting’ arthritis because it migrates to other joints within 1-2 months
• Carditis
○ Every heart layer (endo, myo, pericardium) can be affected → pancarditis
○ Endocarditis can cause valvular dysfunction. Clinically significant murmurs
○ Myocarditis may result in heart failure and conduction defects
○ Pericarditis → may present clinically with a failry benign pericardial rub or may lead to more serious complications such as pericardial effusions or cardiac tamponade
○ Most common valve affected in rheumatic fever → mitral valve
○ In a rheumatic fever attack, valve incompetence (i.e. regurgitation) more likely to develop than valve stenosis. Stenosis tends to develop as feature of chronic disease many years later
• Sydenham’s chorea
○ Involuntary, semi-purposeful movements of the body which may be unilateral or bilateral
• Erythema marginatum
○ Rash found in rheumatic fever which may present early on in the disease. Pink macular rash.
Minor criteria
• Polyarthralgia
○ Pain present in multiple joints
• Prolonged PR interval on ECG
• History of rheumatic fever
• Fever
• Raised inflammatory markers
Including CRP, ESR, and leukocytes

121
Q

Management of rheumatic disease:

A

Acute management
Conservative management
• Bed rest recommended as first line
○ Even more important in cases of suspected active myocarditis (indicated by abnormalities seen on the echocardiogram and a raised ESR). Exercise limitation is strongly advised
○ Best rest recommended until CRP has returned to normal range.

Medical management
• Penicillin antibiotic of choice
○ Single stat dose of intravenous benzylpenicillin initially, followed by oral penicillin V for at least 10 days
○ Patients allergic to penicillin → erythromycin or azithromycin give for 10 days
○ To limit inflammatory response → high-dose aspirin should be given with careful monitoring
○ If inflammation and fever do not improve, or child has evidence of moderate to severe carditis → corticosteroids
○ Acute heart failure → involves combination of ACE inhibitors and diuretics

122
Q

Complications of rheumatic disease:

A

Complications
Valvular disease
• Acute episodes may lead to leaky or regurgitant, valves.
• However, long term, valves may become scarred, hardened and stenosed
• Mitral regurgitation is the most common valve lesion in rheumatic fever
○ Mitral stenosis is the most common long-term cardiac complication accounting for approximate 70% of chronic rheumatic valve disease

123
Q

Aortic stenosis:

A

Stenosis (narrowing or restriction of passage):
Obstruction of the LV outflow resulting in decreased cardiac output.
Can be characterised as mild to moderate, and is usually asymptomatic.
Aortic Valve can be auscultated in the right 2nd intercostal space next to the sternum.
Aortic valves in normal hearts should have 3 cusps.

During cardiac cycle, when the aortic valve is open, so is the pulmonary valve
When both of these are open, the tricuspid and the mitral valve are closed.
When the aortic valve is stenosed the heart cannot pump blood effectively.
Stenosis results in decreased blood flow, with decreased blood flow comes decreased cardiac output.

124
Q

3 cardinal signs of stenosis:

A

Dizziness on exertion
Dyspnoea on exertion
Angina on Exertion

125
Q

How to look for aortic stenosis on CV exam?

A

When performing a CVS exam, you can feel signs of aortic stenosis in the carotid pulse, usually this pulse would be fast, but with stenosis it’s abnormally slow and weak.
If you auscultate a stenosed aortic valve on a CVS exam, you should hear a reduced intensity of the 2nd heart sound (S2). The 2nd heart sound is the sound made when both aortic and pulmonary valves snap closed during the cardiac cycle.

126
Q

Aortic murmur:

A

Aortic Murmur explained
• Normally between 1st sound (S1) and 2nd sound (S2) , blood would be flowing normally out of the ventricles and up the aorta. When the aortic valve is stenosed, blood is squeezed through a tighter aperture, so you can hear turbulence of blood passing through the aorta during systole.
• The sound aortic stenosis makes is called “systolic click crescendo decrescendo murmur or Ejection Systolic Murmur)
• Murmur can radiate to the carotids.

127
Q

Most common causes of aortic stenosis in western populations:

A

• Congenital abnormal valves (having 2 cusps instead of 3) 2% of the population
• Calcification of the aortic valve (a result of atherosclerotic processes, coming with the usual risk factors)
• Rheumatic valvular heart disease (less common in the west in the modern era but still occurs especially in those who come from non-western countries or those who may have previously been exposed to tropical diseases)

128
Q

Investigations performed to diagnose aortic stenosis:

A

Investigations performed:
• ECG
• Cardiac catheterisation and angiography
TOE (Transoesophageal Echo) - gold standard for diagnosing valvular heart disease.

129
Q

Management of aortic stenosis:

A

Management
• Valve replacement or repair is best if the patient is a good candidate for surgery.
Mechanical or bioprosthetic valves can be used.
Mechanical valve replacement often used for younger patients as it lasts longer. Use of long term anticoagulants and antibiotics will usually be needed following surgery, potentially for the rest of life.
• For patients who cannot have a mechanical valve replacement, they can have balloon valvuloplasty which is where a balloon is used to dilate the valve via cardiac catheterisation.

130
Q

Difference between sclerosis and stenosis

A

• Sclerosis will progress and be defined as stenosis once aortic valve cusps are clearly restricted upon echocardiogram, as well as an observable increase in “transaortic peak velocity”.

131
Q

Describe aortic regurgitation:

A

Backflow into LV occurring during diastole. This results in a diastolic murmur.
Increased preload causes left ventricular hypertrophy.
Aorta is very elastic, and thus when high pressure blood passes through it expands, and then snaps back into place, acting as a pump in itself to help force blood against TPR. In aortic regurgitation however, this pump action doesn’t force blood forward, but pushes it back through the impaired aortic valve and into the left ventricle.
Results in an increased LVEDV. More blood in the LV at the start of systole means higher systolic blood pressure or an “increased pulse pressure”. This means the difference between systolic bp and diastolic bp is very wide.

132
Q

Symptoms clinical features of atrial regurgitations:

A

Symptoms and clinical features
• Syncope
• Lvh
• Angina - caused by impaired diastolic blood pressure. Diastole is when the coronary arteries are filled, with reduced pressure here, they cannot fill as adequately. This poor supply, in conjunction with an increased demand on the heart due to backflow and high LVEDV causes anginal pain.
• Tachycardia is well tolerated (strangely)
• High pitched murmur at the left sternal border, doing the accentuation manoeuvre of leaning forward
• Austin flint murmur - the murmur occurring when blood flows back through the aortic valve, which interferes with the opening of the mitral valve.
Collapsing water hammer pulse.

133
Q

Causes of aortic regurgitation:

A

Causes
Aortic rood dilation secondary to connective tissue disorder (ehlers danlos, marfans, lupus)
Congenital valve abnormality
Inflammatory or rheumatic disease and infective endocarditis (usually younger px)

134
Q

Investigations for aortic stenosis:

A

Investigations
Echocardiogram
Chest x ray - LVH on x ray and pulmonary

135
Q

Treatment for aortic stenosis

A

Treatment
• Loop diuretics to reduce volume and thus preload.
• Reduce afterload via GTN
• Valve replacement

136
Q

Emergency management of undiagnosed or acute heart failure and cardiogenic shock

A

Suspected acute Heart Failure/Cardiogenic Shock and Pulmonary Oedema….

WHAT SHOULD I DO?

Patient is showing signs of acute heart failure/cardiogenic shock……

You have 30 minutes to save their life……..

Stabilise your patient by:

• Giving patient inotropes, such as dopamine, nitrates and vasopressors.  

• If signs and symptoms persist you may need to refer potential patients for mechanical ventilation or heart transplant
137
Q

Emergency management of pulmonary oedeama

A

Patient is showing signs of pulmonary oedema…..

You have 30 minutes to save their life….

Stabilise your patient by:

• Offering diuretics intravenously (thiazide, furosemide etc) to get rid of excess fluid in the lungs. 

• Monitor intake and output, kidney functions, urine and electrolytes etc.
138
Q

Tricuspid regurgitation

A

Back flow of blood from right ventricles to right atrium during systole

139
Q

Primary causes of tricuspid regurgitation:

A

Primary is less common causes include
• carcinoid tumours
• Blunt chest trauma
• Drugs
• Epstein anomaly - congenital abnormality of the tricuspid.
• Pacemaker leads
• Infective endocarditis
• Rheumatic fever
• Marfans

140
Q

Secondary causes of tricuspid regurgitation:

A

Secondary is more common and is a functional issue caused by:
• pulmonary hypertension which results in changes in the heart and a dilatation of the right atrium and ventricle.
• Anything that causes pulmonary hypertension i.e. Left sided heart failure, Mitral regurgitation,
• Primary pulmonary diseases i.e. PE, COPD.
• Atrial and ventricular septal defects
• Pulmonary valve stenosis
• Hyperthyroidism

141
Q

What would tricuspid regurgitation present on examination?

A

On examination:
• Shortness of breath
• Peripheral cyanosis
• Raised JVP
• A pulsatile jugular vein
• Right ventricular heave due to dilated right ventricle
• Hollow systolic murmur at lower left sternal border. (will be louder during inspiration)
• Hepatomegaly
• Peripheral oedema
• Ascites

142
Q

Investigations for tricuspid regurgitation:

A

Investigations
• ECG - may reveal right ventricular hypertrophy, right axis deviation, atrial fibrillation due to increased pressure in right atrium.
• Chest x ray - may reveal cardiomegaly and pleural effusion
• Echocardiogram
• Cardiac MRI
• Cardiac catheterisation

143
Q

Treatment and management for tricuspid regurgitation:

A

Treatment and management
• Treat underlying cause
• Treating heart failure - i.e. loop diuretics and aldosterone
• Valve replacement and anticoagulation
• Cardiac catheterisation procedures.

144
Q

Pulmonary valve stenosis:

A

Pulmonary Valve Stenosis
• Narrowing of the pulmonary valve.
• In adults it’s usually due to a complication of another issue,
• In children it’s most often caused by a congenital abnormality.
• Ranges from mild to severe.

145
Q

Signs and symptoms of pulmonary valve stenosis:

A

Signs and Symptoms
• Exertional fatigue
• Profound Cyanosis
• Exertional Dyspnoea
• Exertional Anxiety
• Syncope and collapse
• Heart Murmur (mid systolic murmur preceded by an ejection click)
• Chest Pain
• Failure to thrive (in neonates)

146
Q

Causes and risk factors of pulmonary valve stenosis:

A

Causes and risk factors
• Rheumatic Fever
• Noonan Syndrome
• Alagille Syndrome
• Williams Syndrome
• Black ethnicity
• Infectious endocarditis
Myocardial tumours

147
Q

What is the role of diuretics and name the three main types:

A

Diuretics

By reducing salt and water reabsorption from the glomerular filtrate in the kidney, diuretic drugs increase the excretion of Na+, which is followed by water to maintain osmolarity.

• The result is a reduction of the plasma volume and a drop in cardiac output. 

Three types of diuretic are introduced: loop diuretics, thiazide diuretics and aldosterone antagonists.

• All of these drugs lower blood pressure, but only the thiazides are used as mainstream anti-hypertensive drugs. 

Diuretics interfere with the reabsorption process, resulting in an increased loss of salt and water.

Diuretics work at two main sites, the loop of Henle and the distal convoluted tubule.

148
Q

Clinical use of loop diuretics:

A

Reserved for patients with pulmonary oedema, heart failure, renal insufficiency or resistant hypertension.

Reduce oedema

Usually administered as a low dose daily oral tablet, but intravenous infusion gives a rapid effect.

149
Q

Clinical use of thiazides

A

Until a few years ago, thiazides were the first-line treatment for hypertension. Now usually given as an add on, if other drugs are not sufficiently effective on their own.

Thiazides potentiate the effects of other antihypertensive drugs.

Administered as a daily oral tablet only.

150
Q

Clinical use of aldosterone antagonists (MRA):

A

Used in the treatment of:

• heart failure
• hyperaldosteronism
• resistant hypertension, especially with low renin

Prevents hypokalaemia when given with a loop or thiazide diuretic

Given as a daily oral tablet.

151
Q

Main side effects of loop diuretics:

A

Excessive loss of Na+ and water, resulting in hypovolaemia and hypotension.

Decreased cardiac output.

Potassium loss, resulting in hypokalaemia.

Metabolic alkalosis

152
Q

Main side effects of thiazide:

A

Safe drugs with few side effects, including:

• more frequent urination
• hypokalaemia erectile dysfunction (mechanism not known but could relate to vasodilator action
153
Q

Main side effects of aldosterone antagonist:

A

Potentially fatal hyperkalaemia

Gastrointestinal upset

Gynaecomastia, menstrual disorders and testicular atrophy due to actions at other steroid receptors

154
Q

Thiazides:

A

Thiazides

Thiazides and related compounds are moderately potent diuretics; they inhibit sodium reabsorption at the beginning of the distal convoluted tubule through inhibiting the sodium-chloride transported.

They act within 1 to 2 hours of oral administration and most have a duration of action of 6 to 24 hours; they are usually administered early in the day so that the diuresis does not interfere with sleep.

In the management of hypertension a low dose of a thiazide produces a maximal or near-maximal blood pressure lowering effect, with very little biochemical disturbance.

Higher doses cause more marked changes in plasma potassium, sodium, uric acid, glucose, and lipids, with little advantage in blood pressure control.

• Chlortalidone and indapamide are the preferred diuretics in the management of hypertension. 
• Chlortalidone may be given on alternate days to control oedema.
• Bendroflumethiazide can be used for mild or moderate heart failure.
155
Q

Loop diuretics:

A

Loop diuretics

Loop diuretics are used in pulmonary oedema due to left ventricular failure; intravenous administration produces relief of breathlessness, by improving pulmonary vascular congestion by decreasing filling pressure, and reduces pre-load, thus reduces ventricular filling.

Loop diuretics act in the loop of Henle and inhibit the reabsorption of sodium and water. When excess water and sodium are eliminated, less water remains in the bloodstream. They relieve symptoms such as oedema and breathlessness caused by the congestion of fluid.

Loop diuretics are also used in patients with chronic heart failure.

Diuretic-resistant oedema can be treated with a loop diuretic combined with a thiazide or related diuretic (e.g. bendroflumethiazide or metolazone).

Furosemide and bumetanide are similar in activity; both act within 1 hour of oral administration and diuresis is complete within 6 hours so that, if necessary, they can be given twice in one day without interfering with sleep.

156
Q

Mineralocorticoid receptor antagonists (aldosterone antagonists)

A

Mineralocorticoid receptor antagonists (aldosterone antagonists)

Aldosterone receptor antagonists block the effects of aldosterone. This causes reabsorption of sodium by the kidneys and other glands, which encourages water loss, and a subsequent decrease in blood pressure and reduction in fluid around the heart.

Potassium-sparing diuretics are not usually necessary in the routine treatment of hypertension, unless hypokalaemia develops.

Spironolactone potentiates thiazide or loop diuretics by antagonising aldosterone; it is a potassium-sparing diuretic.
K
Spironolactone is of value in the treatment of oedema and ascites caused by cirrhosis of the liver; furosemide can be used as an adjunct. Low doses of spironolactone are beneficial in moderate to severe heart failure and when used in resistant hypertension [unlicensed indication].

Spironolactone is also used in primary hyperaldosteronism (Conn’s syndrome). It is given before surgery or if surgery is not appropriate, in the lowest effective dose for maintenance.

Eplerenone is licensed for use as an adjunct in left ventricular dysfunction with evidence of heart failure after a myocardial infarction; it is also licensed as an adjunct in chronic mild heart failure with left ventricular systolic dysfunction.

Potassium supplements must not be given with mineralocorticoid receptor antagonists.