Ventricular tachycardia refers to a wide QRS complex heart rhythm — that is, a QRS duration beyond 120 milliseconds — originating in the ventricles at a rate of greater than 100 beats per minute.

These QRS complexes are exactly three large boxes ... This rhythm is actually an accelerated idioventricular rhythm, or slow ventricular tachycardia. The atrial rate is indicated by the P waves.