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Q.

‘Lub’ sound coincides with which of the following waves of a standard ECG?

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a

T wave

b

Q wave

c

R wave

d

P wave

answer is B.

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Detailed Solution

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The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves. QRS complex in ECG represents ventricular depolarisation. Ventricular systole occurs in response to depolarisation, shortly after Q wave. Closure of tricuspid and bicuspid valves takes place during ventricular systole and it coincides with R wave on ECG.

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