A 35-year-old presents with pulmonary hypertension and is diagnosed as being in right heart failure. Which is the most likely cause of this condition?
a. Aortic stenosis
b. Tricuspid regurgitation
c. Aortic regurgitation
d. Mitral regurgitation
ANS: B
Tricuspid regurgitation leads to volume overload in the right atrium and ventricle, increased sys-temic venous blood pressure, and right heart failure. Aortic stenosis is manifested by narrowed pulse pressure. Aortic regurgitation is manifested by widened pulse pressure resulting from in-creased stroke volume and diastolic backflow. Mitral regurgitation is manifested by heart failure but not pulmonary hypertension.
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