Three or more PVCs in a row at what would be a rate of over 100 beats per minute is called ventricular tachycardia (V-tach).

Sustained ventricular tachycardia is usually defined as VT lasing for more than 30 seconds. VT can be monomorphic (most common) or polymorphic (a.k.a. Torsades de Pointes).

Acceleration to a faster monomorphic VT, polymorphic VT, or VF, is uncommon when ATP is applied to slow VT (CL < 300-320 ms).

The findings, they say, question such routine CAD/ischemia testing in patients like those studied, who had episodes of monomorphic ventricular tachycardia (VT) storm but not an acute coronary ...