Which of the following waves in ECG represents ventricular depolarisation?

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U wave

T wave

P wave

R wave

answer is D.

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Detailed Solution

QRS complex represents the depolarisation of the ventricles. QRS complex includes three waves: a small downward Q wave, a large upward R wave and a small downward S wave. Q wave represents the depolarisation of the interventricular septum, R wave represents the early depolarisation of ventricles and S wave represents the late depolarisation of ventricles. P wave represents the depolarisation of the atria. T wave represents the repolarisation of the ventricles. U wave is a waveform that is sometimes seen on an ECG as a small upward deflection after T wave. It is thought to represent the late repolarisation of the Purkinje fibres and papillary muscles.

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