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

Options

A. At the P wave
B. Just after the P wave
C. Just before the QRS complex
D. Just after the QRS complex

Answer

D

Explanation

The first heart sound is lub sound produced during ventricular depolarization or ventricular systole. If the heart sound superimposed with ECG then first wave form is QRS wave represent ventricular systole.