HOCM and afterload

[Day man]

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In UW, one of the explanations lists increasing TPR will result in a decreased HOCM murmur...uh, anyone know if this is true? I've been taught/read the dynamic outflow obstruction seen in HOCM decreases with increased blood in the heart (preload) via squatting, slowing heart rate to increase filling time w/ beta blockers. I searched the step II threads and nothing mentions this...so if anyone has some ideas, I'd much appreciate the knowledge.

 

[DuxburyPembroke]

Do you think squatting increases preload more than afterload?