Cardiovascular Flashcards
What is the heart sound S1? (2)
- Caused by the closure of AV valves
- Marks the end of diastole, the beginning of systole
What is the heart sound S2? (2)
- Caused by closure of the semilunar valves
- Marks the end of systole, beginning of diastole.
What is S2 splitting on inspiration caused by?
Right bundle branch block
What makes S2 louder?
Pulmonary Embolism
What is S3? (2)
- Caused by a rapid of rush of blood into a dilated ventricle
- Associated with heart failure; may occur before crackles.
What is S3 Caused by? (2)
- Pulmonary hypertension and cor pulmonale.
- Mitral, aortic, or tricuspid insufficiency
What are the 5 auscultatory points?
Aortic, pulmonic, erb’s point, tricuspid, mitral (apical)
What is S4?
- Caused by atrial contraction of blood into a noncompliant ventricle
What is S4 associated with? (6)
Myocardial ischemia, infarction, hypertension, ventricular hypertrophy and aortic stenosis
What is pulse pressure?
Systolic- Diastolic = Pulse pressure
Systolic blood pressure is an indirect measurement of what?
Cardiac output and stroke volume
What is narrowing pulse pressure usually seen with?
Severe hypovolemia or severe drop in cardiac output
Diastolic blood pressure is an indirect measurement of what?
Systemic vascular resistance
A widened pulse pressure may indicate what?
Vasodilation, a drop in systemic vascular resistance - sepsis or septic shock
Coronary arteries are perfused during what?
diastole
Causes of valvular heart disease
- CAD/ Ischemia, MI
- Cardiomyopathy
- Bicuspid aortic valve
- Fever/ infection
- Connective tissue diseases
Murmurs of insufficiency occur when the valve is what?
Closed
Murmurs of stenosis occur when the valve is what?
Open
Murmurs of stenosis are acute or chronic?
Chronic
The semilunar (pulmonic, aortic) are what during systole?
OPEN
The AV valves (tricuspid, mitral) valves are what during systole?
CLOSED
The semilunar valves are what during diastole?
CLOSED