Unifocal PVCs are

• A. Unifocal PVCs Look Different Across the Strip
• B. Unifocal PVCs Always Have a P Wave Before Them
• C. Unifocal PVCs Only Occur in One Lead
• D. Unifocal PVCs Look the Same in the Same Strip

Answer: (D)

Unifocal PVCs come from a single site in the ventricles, so each premature beat has the same electrical pattern. On the ECG strip, all the PVCs from that site show identical morphology, appearing the same from beat to beat within the same strip. If PVCs change shape from beat to beat on the same strip, they’re coming from different ventricular sites (multifocal). The presence or absence of a preceding P wave isn’t the defining feature, since a PVC often has no visible P wave at all. So the description that fits best is that unifocal PVCs look the same in the same strip.