A 70-year-old woman has a crescendo-decrescendo systolic murmur radiating to the carotids and has syncope on exertion. Which valve is affected?
Answer and explanation
Correct answer: D. Aortic valve
- Step 1: Aortic stenosis causes this murmur and exertional syncope. Answer: Aortic valve. Why not the others: Mitral valve, Tricuspid valve and Pulmonic valve don't fit.
Practise more Cardiovascular, Respiratory and Renal Physiology.
Free questions with an explanation for every one, and full timed USMLE Step 1 mock tests.
More Cardiovascular, Respiratory and Renal Physiology questions
- Ventricular pressure is rising rapidly while ventricular volume stays constant, just before the aortic valve opens. Which phase of the cardi…
- A patient has an end-diastolic volume of 120 mL and an end-systolic volume of 50 mL. What is the ejection fraction?
- Which part of the systemic circulation has the greatest total cross-sectional area and therefore the slowest blood velocity?
- Which change shifts the oxygen-hemoglobin dissociation curve to the right, so that hemoglobin releases oxygen more easily to the tissues?
- A patient has a GFR of 120 mL/min and an effective renal plasma flow of 600 mL/min (from PAH clearance). What is the filtration fraction?
- Which segment of the nephron reabsorbs about two thirds of the filtered sodium and water and essentially all of the filtered glucose and ami…