A tale of the spontaneous variability of premature ventricular contractions.

Asdata from mobile coronary units and coronary care units in the early 1970s accumulated, we saw a strong association between the incidence of premature ventricular contractions (PVCs) and sudden coronary death.1 The profession devised and delivered treatment in a climate charged with the fear that PVCs would inevitably trigger ventricular fibrillation. The picture was a familiar one in CCUs: physicians and nurses regarded every PVC on CCU monitors as life-threatening and aggressively treated these arrhythmias, especially in their complex forms,