When is a PVC not a PVC? Definitions vary regarding 3 or more PVCs; Some authors define three PVCs as a triplet of PVCs; whilst others describe this as a 'short burst of VT'; but more commonly as NSVT; A consensus definition would be: 3-30 consecutive PVCs with a rate >100bpm described as non-sustained VT (ventricular rhythm if rate <100bpm)