Valvular Heart Disease USMLE Step 1 Practice Question

An otherwise healthy 27-year-old woman is referred to a cardiologist because of a murmur detected by her general practitioner during a routine health maintenance examination. She has a history of recurrent episodes of sore throat and fever during childhood. She emigrated from Kenya 6 years ago. Cardiac examination shows an opening snap followed by a late diastolic rumble, which is best heard at the fifth intercostal space in the left midclavicular line. Which of the following pressure-volume loop graphs is most likely to correspond to this patient's cardiac condition?