Q- first heart sound is soft in all of the following conditions , except
a- short PR interval
b- ventricular septal defect
c- mitral regurgitation
d- calcified valve
the answer is a . short PR interval .
the first heart sound also called S1 is loud only in two conditions , one is the short PR interval and the other is the AORTIC STENOSIS .
the first heart sound is soft in the following conditions :
1- LONG PR INTERVAL
2- VENTRICULAR SEPTAL DEFECT
3- MITRAL REGURGITATION
4- CALCIFICATION IN MITRAL STENOSIS .
the first heart sound is normally produced due to the closure of the AV valves .
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