Cardiovascular Flashcards
Atrial Fibrillation
Definition (3)
Chaotic, irregular atrial rhythm at 300-600bpm
AV node responds intermittently, hence irregular ventricular rate
Cardiac output drops by 10-20%
Atrial Fibrillation
Aetiology (9)
Heart Failure Hypertension MI PE Mitral valve disease Pneumonia Hyperthyroidism Caffeine/alcohol Low potassium/magnesium
Atrial Fibrillation
Signs + symptoms (5)
Mostly asymptomatic Chest pain Palpitations Dyspnoea Irregularly irregular pulse
Atrial Fibrillation
Investigations (3)
ECG: absent P waves, irregular QRS
Bloods: U&Es, cardiac enzymes, TFTs
Echo: left atrial enlargement, mitral valve disease, poor LV function
Atrial Fibrillation
Acute treatment <48 hours (4)
Emergency cardioversion (amiodarone/flecainide)
Treat associated illness
Control ventricular reate: 1st verapamil/bisoprolol, 2nd digoxin/amiodarone
Anticoagulation: LMWH
Atrial Fibrillation Chronic treatment (3)
Rate control: B-blocker/rate-limiting CCB 1st, then add digoxin, then add amiodarone
Anticoagulation: warfarin (INR aim 2-3), or aspirin if contraindicated
Rhythm control: only if symptomatic, do cardioversion
Atrial Fibrillation
CHA2DS2-VASc Score (4)
Quantifies risk of stroke
Consider anticoagulation
1 point for: part failure, diabetes, hypertension, vascular disease, age >65, female
2 points for: age >75, prior TIA/stroke
Atrial Flutter
Definition (2)
Small group of ectopics
Continuous atrial depolarisation (regular rhythm but faster than waves)
Atrial Flutter
Investigations (1)
ECG: sawtooth baseline +/- 2:1 AV block
Atrial Flutter
Treatment (2)
Anticoagulation then cardioversion
Amiodarone to restore sinus rhythm
Heart Failure
Aetiology (5)
Previous MI Hypertension Heart valve disease Cardiomyopathy Arrhythmias
Heart Failure
Definition (1)
Cardiac output is inadequate for the body’s requirements
Heart Failure Systolic Failure (3)
Inability of ventricle to contract normally
Reduced cardiac output
Caused by ischaemic heart disease, MI, cardiomyopathy
Heart Failure Diastolic Failure (2)
Inability of ventricle to relax and fill normally
Caused by constrictive pericarditis, tamponade, hypertension, restrictive cardiomyopathy
Heart Failure
Left ventricular failure (6)
Body doesn’t get enough oxygenated blood, blood backs up into lungs causing SOB + fluid build up
Dyspnoea
Fatigue
Orthopnoea
Paroxysmal nocturnal dyspnoea and nocturnal cough
Weight loss + muscle wasting
Heart Failure
Right ventricular failure (4)
Usually triggered by left-sided heart failure or lung disease as the right ventricle has to work harder
Peripheral oedema
Ascites
Nausea
Heart Failure
Investigations (3)
CXR: cardiomegaly, prominent upper lobe vessels, pleural effusion
Echo: valvular disease, LV dysfunction
BNP: elevated
Heart Failure
Treatment of acute heart failure (6)
O2
Diamorphine
Furosemide
GTN spray
If systolic BP >100 start nitrate infusion
If worsening give more furosemide, consider CPAP
Heart Failure
Treatment of chronic heart failure (4)
Diuretics: furosemide, bumetanide (these lower K so may need to add K-sparing diuretic- spironolactone)
ACE-i: improves symptoms
B-blockers: start low and go slow
Digoxin: strengthens force of contractions
Arrhythmias Cardiac causes (5)
MI Coronary artery disease LV aneurysm Mitral valve disease Cardiomyopathy
Arrhythmias
Non-cardiac causes (4)
Caffeine/smoking/alcohol
Pneumonia
Drugs (B2 agonists, digoxin)
Metabolic imbalance (K, Ca, Mg, hypoxia)
Arrhythmias
Presentation (5)
Some asymptomatic + incidental, eg. AF palpitation Chest pain Syncope Hypotension
Arrhythmias
Investigations (3)
Bloods: FBC, U+E, glucose, Ca, Mg
ECG: short PR interval (WPW syndrome), long QT interval (drugs, metabolic imbalance, congenital), U waves (hypokalaemia)
Echo: structural disease
Arrhythmias
Bradycardia (4)
Fewer than 60bpm
If >40bpm + asymptomatic, no treatment needed
Causes: drugs, sick sinus syndrome, hypothyroidism, B-blocker, digoxin
If rate <40bpm or symptomatic then give atropine, if no response insert temporary pacing wire
Arrhythmias
Supra ventricular tachycardia (3)
P wave absent/inverted after QRS
Narrow complex tachycardia (rate >100bpm, QRS width <120ms)
Treatment: 1st line vagal manoeuvres, 2nd line IV adenosine, 3rd line verapamil
Arrhythmias
Wolff-Parkinson White Syndrome
Congenital accessory conduction pathway between atria and ventricles
ECG: short PR interval, wide QRS complex
Present with SVT
Treatment: ablation of accessory pathway
Arrhythmias Ventricular Tachycardia (4)
Broad complex tachycardia (rate >100bpm, QRS >120ms)
Acute management: IV amiodarone or IV lidocaine
Maintenance anti arrhythmic: oral amiodarone
Prevention of recurrent VTs: implantation of automatic defibrillators (ICD)
Acute Coronary Syndromes Risk Factors (8)
Age Male Family history of IHD Smoking Hypertension Diabetes Hyperlipidaemia Obesity
Acute Coronary Syndromes
Diagnostic Criteria of Acute MI (4)
Increase followed by decrease in cardiac biomarkers
Symptoms of ischaemia
ECG changes
Loss of myocardium on imaging
Acute Coronary Syndromes
Symptoms (5)
Central chest pain lasting >20 mins Nausea Sweatiness Dyspnoea Palpitations
Acute Coronary Syndromes
Signs (6)
Pallor Sweatiness Pulse high or low BP high or low 4th heart sound May have signs of heart failure (increased JVP, 3rd heart sound, basal crepitations
Acute Coronary Syndromes
Investigations (4)
ECG: tall T waves, ST elevation or new LBBB over hors, T wave inversion and pathological Q waves, over hours- days
CXR: cardiomegaly, pulmonary oedema, widened mediastinum
Bloods: FBC, U+E, glucose, lipids
Cardiac enzymes: cardiac troponin (T + I) levels rise within 3-12 hours and peak at 24-48 hours and creatinine kinase
Acute Coronary Syndromes Differential Diagnosis (6)
Angina Pericarditis Myocarditis Aortic dissection Pulmonary embolism Oesophageal reflux
Acute Coronary Syndromes
Pre-hospital management (3)
Aspirin 300mg
Sublingual GTN
analgesia
Acute Coronary Syndromes
Hospital management of STEMI (4)
Primary angioplasty or thrombolysis
B-blocker
ACE-i if normotensive
CClopidogrel for 30 days
Acute Coronary Syndromes
Hospital management of NSTEMI (3)
B-blocker
Antithrombotic fondaparinux if low risk
Consider clopidogrel
Acute Coronary Syndromes Subsequent Management (8)
Bed rest 48h Aspirin Thomboprophylaxis B-blocker ACE-i Statin Address modifiable risk factors Work after 2 months, sex after 1 month, flying after 2 months
Acute Coronary Syndromes
Complications of MI (9)
Cardiac arrest Bradycardia (give atropine/temporary cardiac pacing) AV block Tachycardias RV failure Pericarditis Embolism Cardiac tamponade Mitral regurgitation
Angina
Definition (1)
Due to myocardial iscahemia and presents as central chest tightness, which is brought on by exertion and relieved by rest
Angina
Aetiology (6)
Atheroma (reduced coronary blood flow, reduced O2 transport, increased myocardial O2 demand) Age Male Smoking Hypertension Tachyarrhythmias
Angina
Stable vs Unstable (2)
Stable- induced by effort, relieved by rest
Unstable- increasing frequency/severity, occurring at minimal exertion or at rest
Angina
Investigations (4)
ECG: mostly normal but may have ST depression or flat/inverted T waves
Angiography
Exercise tolerance test
Functional imaging (stress echo or MRI)
Angina
Canadian Classification of Severity (4)
I- only significant exertion
II- moderate exertion
III- mild exertion
IV- at rest
Angina
Treatment (8)
Modify risk factors: smoking, exercise, weight loss, cholesterol, hypertension
Aspirin: reduces mortality
B-blocker: reduces symptoms and prevent attacks
CCBs: relax arteries
Nitrates: GTN spray/sublingual tablets for symptoms and regular oral nitrate (isosorbide mononitrate) for prophylaxis
Refer if sudden onset, uncontrollable post MI/CABG, unstable
CABG: reroutes blood around affected artery
PCI: widening of artery with stent
Pulmonary Oedema
Definition (2)
Excess fluid in the lungs
Leads to impaired gas exchange and may cause respiratory failure
Pulmonary Oedema
Aetiology (2)
Left ventricular failure
Injury to lung parenchyma/vasculature
Pulmonary Oedema
Signs and symptoms (4)
Difficulty breathing
Haemoptysis
Sweating
End-inspiratory crackles
Pulmonary Oedema
Investigations (2)
CXR: fluid in alveolar walls, Kerley B lines
Echo: heart failure
Pulmonary Oedema
Treatment (2)
Oxygen if hypoxic
Treat underlying cause eg. heart failure, infection
Hypertension Risk factors (10)
Smoking Diabetes Renal disease Male Hyperlipidaemia Previous MI/stroke Genetics Race Age Sodium intake
Hypertension
Stages of Disease (4)
Prehypertension: 120/80mmHg
Stage 1: 140/90mmHg (mild)
Stage 2: 160/100mmHg (moderate)
Stage 3: 180/110mmHg (severe)
Hypertension
Pathology (2)
Increased reactivity of resistance vessels and resultant increase in peripheral resistance
Kidneys unable to secrete appropriate amounts of sodium for any given BP
Hypertension
Types (3)
Essential hypertension: cause unknown
Malignant hypertension: rapid rise in BP leading to vascular damage, severe hypertension and bilateral retinal haemorrhage and exudates, may have papilloedema
Secondary hypertension: renal disease- glomerulitis, systemic sclerosis, PCKD, chronic pyelonephritis OR endocrine disease- Cushing’s, Conn’s, pheochromocytoma OR pregnancy OR steroids
Hypertension
Treatment step 1 (3)
Over 55 or Afro-Caribbeans: CCB
CCB intolerant or heart failure risk: thiazide type diuretic
Under 55: ACE-i or ARB if ACE-i intolerant
Hypertension
Treatment step 2 (1)
Add thiazide type diuretic to CCB or ACE-i
Hypertension
Treatment step 3 (1)
CCB + ACE-i + diuretic
Hypertension
Treatment step 4 (2)
Add spironolactone if serum K+ <4.5mmol/l
Higher dose thiazide type diuretic if K+ >4.5mmol/l
Hypertension
Treatment in pregnancy (2)
Never ACE-i
Thiazide type diuretic and/or amlodipine
Aortic Stenosis
Aetiology (3)
Degeneration (old age calcification)
Rheumatic heart disease
Congenital bicuspid valve
Aortic Stenosis
Signs + symptoms (8)
Triad of angina, syncope and heart failure Dyspnoea Dizziness/syncope Slow rising pulse Heaving, non-displaced apex beat LV heave Aortic thrill Ejection systolic murmur, radiating to carotids
Aortic Stenosis
Investigations (3)
ECG: left bundle branch block or complete AV block may be present
CXR: left ventricular hypertrophy, calcified aortic valve
Echo: diagnostic +/- doppler echo to assess severity
Aortic Stenosis
Treatment (2)
Aortic valve repair/replacement
TAVI if unfit for surgery
Aortic Regurgitation Acute causes (3)
Infective endocarditis
Ascending aortic dissection
Chest trauma
Aortic Regurgitation Chronic causes (4)
Congenital: bicuspid aortic valve
Connective tissue disorders: Marfan’s, Ehlers-Dalos
Rheumatic fever
Rheumatoid arthritis
Aortic Regurgitation
Signs + symptoms (6)
Exertion dyspnoea Orthopnoea Paroxysmal nocturnal dyspnoea Collapsing pulse Displaced apex beat Early diastolic murmur (heard best in expiration sat forward)
Aortic Regurgitation
Investigations (4)
ECG: LVH
CXR: cardiomegaly, pulmonary oedema, dilated ascending aorta
Echo: diagnostic
Cardiac catheterisation: assess severity
Aortic Regurgitation
Treatment (2)
Aortic valve replacement/repair
Medical therapy to reduce systolic hypertension: ACE-i
Mitral Stenosis
Aetiology (3)
Rheumatic
Congenital
Prosthetic valve
Mitral Stenosis
Signs + symptoms (12)
Begin when valve orifice <2cm Dyspnoea Fatigue Palpitations Chest pain Systemic emboli Haemoptysis Malar flush (reduced cardiac output) Low-volume pulse AF Tapping non-displaced apex beat Loud S1, rumbling mid-diastolic murmur, best heard in expiration lying on side
Mitral Stenosis
Investigations (3)
ECG: AF
CXR: left atrial enlargement, pulmonary oedema, mitral valve calcification
Echo: diagnostic
Mitral Stenosis
Treatment (4)
Rate control and anticoagulation if in AF
Diuretics: reduced preload and pulmonary venous congestion
Balloon valvuloplasty if non-calcified
Open mitral valvotomy or replacement
Mitral Stenosis
Complications (3)
Pulmonary hypertension
Emboli
Pressure from large LA on local structures (eg. hoarseness, dysphagia)
Mitral Regurgitation
Aetiology (5)
Degenerative calcification and thickening of valve Rheumatic heart disease Mitral valve proplapse Infective endocarditis LV dilatation
Mitral Regurgitation
Signs + symptoms (8)
Soft S1, split S2 with radiation to axilla, low pitch (bell) Dyspnoea Fatigue Palpitations Infective endocarditis AF Displaced apex beat RV heave
Mitral Regurgitation
Investigations (4)
CXR: enlarged LA + LV, mitral valve calcification, pulmonary oedema
ECG: AF
Cardiac catheterisation
Echocardiography
Mitral Regurgitation
Treatment (3)
Rate control and anticoagulation if AF
Diuretics: improve symptoms
Surgical repair/replacement
Pulmonary Stenosis
Aetiology (2)
Congenital (Turner’s, Noonan’s, William’s, Fallot’s tetralogy)
Rheumatic fever
Pulmonary Stenosis
Signs + symptoms (6)
Dyspnoea Fatigue Oedema Ascites RV heave Ejection systolic murmur radiating to left shoulder
Pulmonary Stenosis
Investigations (3)
ECG: right bundle ranch block
CXR: prominent pulmonary arteries
Cardiac catheterisation
Pulmonary Stenosis
Treatment (1)
Valvuloplasty/valvotomy
Pulmonary Regurgitation
Aetiology (1)
Pulmonary hypertension
Pulmonary Regurgitation
Signs + symptoms (1)
Decrescendo murmur in early diastolic at left sternal edge
Tricuspid Stenosis
Aetiology (3)
Mainly rheumatic fever
Congenital
Infective endocarditis
Tricuspid Stenosis
Signs + symptoms (5)
Fatigue Ascites Oedema AF Early diastolic murmur heard at left sternal edge in inspiration
Tricuspid Stenosis
Investigations (1)
Echo
Tricuspid Stenosis
Treatment (2)
Diuretics
Surgical repair
Tricuspid Regurgitation
Aetiology (3)
RV dilatation
Rheumatic fever
Infective endocarditis
Tricuspid Regurgitation
Signs + symptoms (6)
Fatigue Ascites Jaundice Oedema RV heave Pan systolic murmur, heard best at lower sternal edge in inspiration
Tricuspid Regurgitation
Treatment (3)
Treat underlying cause
Diuretics, digoxin, ACE-i
Valve replacement
Infective Endocarditis
Aetiology (4)
Staph. aureus: IVDU
Strep. viridans: valvular surgery
Strep. mutans: dental procedures
Diabetic soft tissue infections