First heart sound (LUBB) coincides with which wave of ECG?

P-wave

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U-wave

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R-wave

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T-wave

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Solution

The correct option is C R-wave
LUBB is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of ventricular systole. This heart sound coincides with R wave of ECG.

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