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Medicine

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Cardiology

Question
4 out of 19
 

Loud S1 in Mitral stenosis is caused by: (NEET 2013)



A Prolonged flow through mitral valve

B 1st degree heart block

C Calcification of the valve

D Immobilization of valve

Ans. A

Prolonged flow through mitral valve

S1 – It is produced primarily by closure of AV valve.

1. Loud S1 (Causes): Mitral stenosis, Tricuspid stenosis, Tachycardia, Short PR interval

ASD (Increase AV flow in L à R & increase AV flow in hyperkinetic state)

2. Soft S1 (Causes): Mitral valve calcification, MR, TR, Obesity, Prolonged PR interval ,

Left pleural effusion, bradycardia.

3. S1 split is seen in Ebstein anomaly, RBBB

Extra Edge:

1. S1 is of Lower frequency than S2

2. S1 is cause by closure of mitral valve

3. S1 is soft in Left pleural effusion, obesity because of poor conduction of sound through chest wall.

4. S1 is Loud due to.

a. Prolonged flow through mitral vale

b. Short PR interval

Cardiology Flashcard List

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