ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. Identify the incorrect interpretation.

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Various waves are observed in a normal ECG:

A. P-wave: It represents the electrical excitation (or depolarization) of the atria, which leads to the contraction of both the atria (atrial systole).

B. QRS complex: It represents the depolarization of the ventricles initiating the ventricular contraction. The starting of ventricular contraction (or beginning of the systole) starts shortly after Q.

C. T-wave: It represents a phase in which the ventricles return from excited to the normal state (repolarisation). The end of the T-wave marks the end of ventricular systole.

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