37. How can you distinguish the murmur of aortic stenosis from that of hypertrophic obstructive cardiomyopathy (HOCM)?

A. Aortic stenosis is low pitched and HOCM is high pitched.

B. Aortic stenosis gets louder with standing from a squatting position and that of HOCM becomes softer

C. Aortic stenosis gets softer after a premature ventricular contraction while HOCM gets louder

D. Aortic stenosis gets softer with Valsalva and HOCM gets louder