USMLE Step 1 Quiz
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CARDIOVASCULAR SYSTEM
Question 1 of 20
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A 17-year-old high school basketball player collapses during practice. On examination, he has a harsh crescendo-decrescendo systolic murmur at the left sternal border that increases in intensity with the Valsalva maneuver. Echocardiography confirms hypertrophic cardiomyopathy.
Which of the following mechanisms best explains the dynamic left ventricular outflow tract obstruction in this patient?
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