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Ventricular repolarization in the human heart: (a) begins in the atria and travels in the same...

Ventricular repolarization in the human heart: (a) begins in the atria and travels in the same direction as the depolarization wave. (b) results from phase 2 of the fast action potential. (c) is represented by the T wave on the electrocardiogram (ECG). (d) is represented by the QRS complex on the electrocardiogram (ECG)

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(c) is represented by the T wave on the electrocardiogram (ECG).

The T wave represents the current of rapid phase 3 ventricular repolarization. The polarity of this wave normally follows that of the main QRS deflection in any lead. The ventricles are electrically unstable during that period of repolarization extending from the peak of the T wave to its initial downslope. A stimulus (e.g. a runaway heartbeat called a premature beat) falling on this vulnerable period has the potential to precipitate ventricular fibrillation: the so call R-on-T phenomenon.

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