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The pattern described, where a premature ventricular contraction (PVC) occurs every other beat, is referred to as bigeminy. Bigeminy specifically indicates that there is a regular alternating pattern of a normal beat followed by a PVC. This is characterized by the sequence of a normal heartbeat (also known as a sinus beat) followed by a PVC, which creates a repetitive cycle of two beats.

In contrast, trigeminy would denote a situation where a PVC occurs after every two normal beats, meaning you would see a normal beat followed by a normal beat and then a PVC repeatedly. Quadrigeminy involves a PVC occurring after every three normal beats. Normal sinus rhythm, on the other hand, refers to a stable rhythm of heartbeats originating from the sinoatrial (SA) node without the presence of ectopic beats like PVCs. Thus, identifying the correct term for the heart's rhythm pattern involves understanding how frequently the PVCs occur relative to the normal sinus beats, which in this case is captured accurately by the term bigeminy.