Premature ventricular contractions (premature ventricular complex, premature ventricular beats)
Premature ventricular contractions (premature ventricular complex, premature ventricular beats): ECG & clinical implications Premature ventricular complexes are also referred to as premature ventricular beats , premature ventricular contractions, or just ventricular beats/contractions/complexes . These terms will be used interchangeably in this discussion. A premature ventricular complex is recognized on the ECG as an abnormal and wide QRS complex occurring earlier than expected in the cardiac cycle. It is caused by an impulse discharged from an ectopic focus which may be located anywhere in the ventricles. The ectopic impulse depolarizes the ventricles; because the impulse is discharged in the ventricles it will spread partly or entirely outside of the conduction system and thus produce a wide QRS complex (QRS duration ≥0.12 s). Refer to Figure 1 for an example. The premature ventricular impulse replaces a sinus beat and induces a delay to the next sinus beat (the RR interval is incre…
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