Chapter·PhysiologyCardiac cycle

Heart sounds and their originDownloads

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1

A 73-year-old man presents to your clinic for a routine checkup. His medical history is notable for a previous myocardial infarction. He states that he has not seen a doctor in "many years". He has no complaints. When you auscultate over the cardiac apex with the bell of your stethoscope, you notice an additional sound immediately preceding S1. This extra heart sound is most likely indicative of which of the following processes?

ADecreased left ventricular compliance

BIncreased left ventricular compliance

CIncreased pulmonary compliance

DDecreased left ventricular filling volume

EIncreased left ventricular filling volume

2

A 64-year-old man presents to the emergency department because he has been experiencing increased shortness of breath for the last 2 weeks. Specifically, he says that he can barely walk up the stairs to his apartment before he feels winded. In addition, he has been waking up at night gasping for breath and has only been able to sleep propped up on 2 more pillows than usual. Physical exam reveals jugular venous distention as well as pitting lower extremity edema. Which of the following abnormal sounds will most likely be heard in this patient?

AOpening snap

BExtra heart sound in early diastole

CExtra heart sound in late diastole

DFixed splitting

EParasternal holosystolic murmur

3

A 31-year-old woman presents to the clinic with shortness of breath, palpitations, and fatigue. She has had these symptoms over the last several weeks. She had been tolerating these symptoms until last night when she could not fall asleep due to palpitations. She has a past medical history of infective endocarditis 6 months ago that was successfully treated with antibiotics. She does not smoke or drink alcohol. Her blood pressure is 138/89 mm Hg and her pulse is 76/min and regular. The cardiac exam reveals a soft S1, S3 gallop, a hyperdynamic apex beat, and a pansystolic murmur that radiates to the axilla on auscultation. Echocardiography reveals incompetence of one of the valves. Which of the following sites is the best position to auscultate this defect?

AMedial end of the 2nd intercostal space on the right side

B4th intercostal space at the midclavicular line on the left side

C5th intercostal space at the midclavicular line on the left side

DMedial end of the 2nd intercostal space on the left side

ERight lower end of the body of the sternum

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