What is the ECG abnormality for premature ventricular contraction (PVC)?

The correct choice highlights that a sinus rhythm can coexist with premature ventricular contractions (PVCs). In a normal sinus rhythm, the heart's electrical activity is initiated by the sinoatrial (SA) node, and the contractions occur in a regular pattern. When PVCs occur, they are characterized by a premature heartbeat that arises from the ventricles rather than the usual conduction pathway through the atria.

The phenomenon of "sinus rhythm with PVC" indicates that while the underlying rhythm remains normal, there are intermittent episodes where the ventricles contract earlier than expected due to these PVCs. This leads to the classic waveform seen on an ECG, where each PVC typically presents as a wide, bizarre QRS complex that occurs before the next expected beat.

This understanding is crucial not only for recognizing the ECG pattern but also for evaluating the clinical significance of PVCs. In many cases, PVCs can be benign, especially if they occur infrequently in an otherwise normal heart. However, if PVCs become frequent or are associated with other abnormalities, they may warrant further investigation and management.

The other options either describe rhythms that are not consistent with the occurrence of PVCs or do not capture the essence of a sinus rhythm combined with PVCs. Recognizing the presence of