Q-T interval

0.01 sec.

Q-T interval

The time elapsing from the beginning of the QRS complex to the end of the T wave in an electrocardiogram, representing the total duration of electrical activity of the ventricles.

Q-T interval,

the period from the beginning of the QRS complex to the end of the T wave on an electrocardiogram. It reflects the refractory period of the heart. A long Q-T interval is associated with the life-threatening ventricular tachycardia known as torsades de pointes. Quinidine, procainamide, and disopyramide can lengthen the Q-T interval.

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