Page 2, USMLE, Dr. D. Penney



USMLE-Type Examination Questions - Cardiac Cycle:


154.  In a resting, healthy individual, the pulmonary valve opens when the pressure in the right ventricle is approximately
	(A)	10 mmHg
	(B)	30 mmHg
	(C)	50 mmHg
	(D)	80 mmHg
	(E)	120 mmHg


159.  The second component of the first heart sound is most closely associated with what event during the cardiac cycle?
	(A)	opening of the mitral valve
	(B)	closure of the mitral valve
	(C)	closure of the aortic valve
	(D)	closure of the pulmonary valve
	(E)	closure of the tricuspid valve


162.  A systolic murmur was heard over the manubrium of the sternum. The most likely diagnosis is
	(A)	an increased hematocrit
	(B)	aortic stenosis
	(C)	aortic insufficiency
	(D)	mitral stenosis
	(E)	patent ductus arteriosus


164.  A continuous murmur is heard over the manubrium of the sternum.  The most likely diagnosis is
	(A)	an increased hematocrit
	(B)	aortic stenosis
	(C)	aortic insufficiency
	(D)	mitral stenosis
	(E)	patent ductus arteriosus


180.  The following data were collected in the right heart (ventricle and pulmonary artery) and the left heart (ventricle and aorta):
						Right		Left
	Ventricular pressure (mm Hg) 		70/8		100/8
	Arterial pressure (mm Hg)		70/20		100/70
	On the basis of these data, what conclusions can you draw?
	(A)	right ventricular systolic pressure is higher than normal
	(B)	pulmonary arterial pressure is lower than normal
	(C)	the abnormal data may be due to tricuspid incompetence
	(D)	the abnormal data may be due to tricuspid stenosis
	(E)	the abnormal data may be due to pulmonic stenosis


184.  Which of the following will cause an increase in left ventricular preload?
	(A)	a decreased end-diastolic volume
	(B)	an increased end-diastolic pressure
	(C)	an increased end-systolic radius
	(D)	an increased stroke volume


193.  Which of the following is true regarding mitral valve motion?
	(A)	the posterior leaflet is the most mobile
	(B)	the valve annulus area decreases during valve closure
	(C)	papillary muscle contraction plays no role in valve closure
	(D)	closure is entirely due to the increase in ventricular pressure
	(E)	the valve leaflets remain far apart throughout ventricular diastole


197.  In working up cardiac data on a patient, a physician notes the following: left ventricular volume is decreasing, left ventricular pressure is rising, and the first heart sound has just ended. What phase of the cardiac cycle is this?
	(A)	early ejection
	(B)	mid-ejection
	(C)	late ejection
	(D)	rapid filling
	(E)	isovolumic ventricular diastole


205.  An event resulting from the backward movement of a pressure wave through the aorta
	(A)	early ejection
	(B)	late ejection
	(C)	atrial contraction
	(D)	dicrotic notch
	(E)	aortic valve opening



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