ILP 5: Cardiac Conditions Flashcards
Left side of the heart receives blood from the______ (_____)
Lungs (oxygenated)
Right side of the heart receives blood from the______ (_____)
Rest (of the body) (deoxygenated)
Arteries pump blood _____ (Towards/Away) from the heart to the body (veins return blood to the heart)
Away
What prevents blood mixing between the right and left sides of the heart?
Interatrial septum & interventricular septum
Which has the thickest wall – the atria (left or right) or ventricles (left or right) – and why?
The left ventricle has the thickest wall as it needs to pump blood around the body [remember, the Left receives oxygenated blood from the Lungs and pumps this around the body, whereas the Right ventricle only needs to pump deoxygenated blood from the Rest of the body to the lungs]. The atria only need to squeeze blood into the adjoining ventricle (much closer, so the atria are smaller and thinner walled).
What is the role of the pericardial fluid? What happens when there is an increase in pericardial fluid? What is this condition?
The pericardial fluid lubricates and creates a frictionless environment for the heart. An increase in pericardial fluid will compress the heart and impair its ability to pump. This is termed cardiac tamponade.
How many cusps does the right atrioventricular valve have? And the left?
RIght = tRIcuspid valve (3) ; Left = bicuspid valve (2) (also termed ‘mitral’).
Are the coronary arteries superficial or deep? What is the implication of this for surgery?
Superficial. This means they are relatively easily located for coronary artery bypass graft (CABG) surgery.
What is systole? And diastole?
Heart contracts ; heart relaxes.
Heart Sounds
How many heart sounds are there? What are they termed?
Two heart sounds = ‘lub, dup’
Electrical Conductivity of the Heart
Where is the first electrical stimulus generated?
Sinoatrial (SA) node in the right atrium
Electrical Conductivity of the Heart
Where is the next impulse? How does this then travel to the ventricles?
Atrioventricular (AV) node –> AV Bundle of His & Purkinje fibres to the ventricles.
What does ECG (Electrocardiogram) look like?
What are 4 ECG physiotherapy considerations?
- Be able to identify a normal and abnormal rhythm and know what arrhythmias means.
- If patient is on ECG monitoring, ensure that all leads are on firmly and that you can identify a good rhythm trace prior to treatment.
- When repositioning the patient you may have to recheck the trace.
- Percussion & vibration may interfere with the trace.
Autonomic Regulation of Heart Rate
An increase in sympathetic nervous system (SNS) will have what result on the heart? What hormones stimulate this action?
↑SNS activation –> ↑HR. This is caused by release of catecholamines, adrenalin and noradrenalin.
Blood Pressure & Total Peripheral Resistance
What three mechanisms affect blood pressure (BP)?
- HR (beats per minute)
- Stroke volume (SV) (volume of blood ejected from a ventricle per contraction)
- Total peripheral resistance (TPR) (friction encountered by blood as it passes through a peripheral artery)
Blood Pressure & Total Peripheral Resistance
What is CO? How is it calculated?
Cardiac Output = SV x HR (the amount of blood ejected from a ventricle per minute)
Stroke Volume
What three methods can increase stroke volume (SV)?
- Increased venous return (Frank Starling’s law)
- Reduced after-load
- Increased contractility of the ventricle (inotropy)
Renal System & Auto Regulation of Blood Pressure
What organ has an important role in regulating blood pressure by secreting the hormone renin?
Kidneys
Renal System & Auto Regulation of Blood Pressure
Along with the kidneys, what other factors influence TPR?
- Temperature (cold vasoconstriction)
- Chemicals
- nicotine –> vasoconstriction –> ↑BP
- alcohol –> vasodilation –> ↓BP
- Diet (salt, saturated fat, cholesterol –> narrowed vessels –> ↑BP)
Renal System & Auto Regulation of Blood Pressure
If blood volume is low, which hormone is released from the pituitary gland? What does this hormone do?
Antidiuretic Hormone (ADH). This causes the renal system to increase the reabsorption of water (ie, less urine is produced) to increase blood volume, VR and pre-load.
What are the 6 Cardiac conditions & implications for physiotherapy?
- Hypertension
- Ischaemic heart disease (IHD)
- Cardiomyopathy
- Heart Failure
- Peripheral artery disease (PAD)
- Venous thrombombolism (VTE)
What are 5 characteristics of hypertension? What is primary and secondary hypertension?
- A consistent elevation of blood pressure
- Systolic >140mmHg; Diastolic >90mmHg
- ~30% of population have hypertension
- Primary (idiopathic): accounts for >90% of cases
- Secondary: renal disease, adrenal tumour, recreational drugs, medications
What are 8 risk factors for hypertension?
What are 4 managements for hypertension?
- Alter modifiable risk factors
- Dietary = restrict sodium intake, increase potassium (K+) intake
- Exercise (level I evidence for 40-70% VO2 max)
- Medications:
- Diuretics to increase urine output, eg: Frusemide (Lasix)
- Angiotensin-converting enzyme (ACE) inhibiters, eg: Captopril (Capoten)
What are the physiotherapy implications for hypertension?
Monitor BP - if too high (actual figure depends on patient) then physiotherapy may have to be delayed as activity may further increase BP. Ensure patient is having their regular medications and reassess.
What is Ischaemic Heart Disease (IHD)?
A relative decrease in perfusion to the heart muscle (myocardium), whereby it is not adequate to meet metabolic demands of the myocardium.
When does Ischaemic Heart Disease (IHD) appear?
Often appears on exertion because the coronary arteries are unable to provide adequate blood to the myocardium to meet the increased metabolic demand
The _______ is most susceptible to ischaemia and injury due to its higher myocardial oxygen demand and larger mass
left ventricle
Why is the left ventricle the most susceptible to ischaemia and injury?
- higher myocardial oxygen demand
- larger mass
What is ischaemia heart disease (IHD) caused by?
Caused by atherosclerosis, a chronic and progressive inflammatory disease of the arterial endothelium with formation of ‘plaques’ (intimal thicke ning and accumulation of lipids)
As IHD is caused by __________ , the term IHD is often used interchangeably with ‘coronary artery disease’ (CAD) or ‘coronary heart disease’ (CHD).
atherosclerosis of the coronary arteries
What are the risk factors of IHD?