Run of PVC’s and ventricular tachycardia (VT)

A PVC may occur simultaneously with ventricular repolarization (T wave). During ventricular repolarization, some regions of the ventricles are still refractory while other parts are already receptive for activation. As a result, rapid ectopic depolarizations can occur in the ventricles, registering on the ECG as a sequence or "run" of PVC’s.

  • A run of three or more PVC’s is called ventricular tachycardia or "VT."
  • When a VT terminates within 30 seconds or less, it is called a non-sustained VT.
  • When a VT persists for more than 30 seconds, it is called a sustained VT.

A VT is very dangerous and may evolve into a lethal arrhythmia called ventricular fibrillation.


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