What is a premature ventricular contraction (PVC)?

A premature ventricular contraction (PVC) is defined as an ectopic beat that originates in the ventricles. This means that the contraction occurs before the regular heartbeat is due, caused by an abnormal electrical impulse starting in the ventricles rather than the normal conduction pathway initiated by the sinoatrial (SA) node. PVCs are often identified on an electrocardiogram (ECG) as wide and bizarre QRS complexes that appear prematurely in the rhythm.

Understanding this concept is crucial since PVCs can indicate underlying cardiac concerns, particularly if they occur frequently or are associated with symptoms. They are considered part of a broader category of arrhythmias and highlight the importance of the ventricles in the overall cardiac cycle. The characteristics and implications of PVCs are significant in both diagnosing and managing potential heart health issues.