160. A post-PVC beat would have what effect on the murmur of aortic stenosis (AS)? What about the murmur of hypertrophic obstructive cardiomyopathy (HOCM)?

A post-PVC beat allows more time for the left ventricle to fill. The more blood in the left ventricle, the more will be ejected. This results in increasing the intensity of the murmur of AS.

In contrast, if there is more blood in the LV, the hypertrophied interventricular septum is pushed out of the left ventricular outflow tract relieving the obstruction to some degree, decreasing the intensity of HOCM.