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How does preload affect the loudness of the murmur of subaortic stenosis?

3 doctors weighed in
Dr. Shalabh Bansal
Pediatrics
2 doctors agree

In brief: 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.

In brief: 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.
Dr. Shalabh Bansal
Dr. Shalabh Bansal
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