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A member asked:
How does preload affect the loudness of the murmur of subaortic stenosis?
A doctor has provided 1 answer
Nice question!: Excellent - physiology at work! in subaortic stenosis, it is basically the muscular component of left ventricular outflow tract which is narrow. With increased preload - greater blood in lv - this stretches the muscle and allows for easier exit through the lvot and softer sound of murmur.
Answered 7/15/2012
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