If heart sound recording and ECG are superimposed, the first heart sound would occur

At P-wave

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Just after P-wave

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Just before QRS complex

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Just after QRS complex.

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Solution

The correct option is D Just after QRS complex.
D. Just after QRS complex
EXPLANATION: QRS complex represents ventricular depolarisation. Atrioventricular valves close after the ventricular contraction. It produces the first heart sound. So the QRS complex of the ECG precedes the first heart sound.

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