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Ventricular tachyarrhythmias: Ventricular tachycardia and ventricular fibrillation

Ventricular tachyarrhythmias are abnormal patterns of electrical activity arising from the ventricular tissue (myocardium and conduction tissue). Ventricular tachycardia (VT) is an abnormal rapid heart rhythm originating from the ventricles. The rhythm may arise from the ventricular myocardium and/or from the distal conduction system. The normal heart rate is usually regular, between 60 and 100 bpm, and there is synchronized atrial and ventricular contraction. In VT, the ventricles contract at a rate greater than 120 bpm and typically from 150 to 300 bpm, and are no longer coordinated with the atria. There is still organized contraction of the ventricles in VT, with discrete QRS complexes. It is a potentially life-threatening arrhythmia, with the risk of degenerating into ventricular fibrillation and resulting in sudden cardiac death. It is characterized by a broad-complex tachycardia on ECG.