393. What does the ECG show for a PJC? Causes of PVCs and ventricular tachycardia / When does a PVC appear narrow? July 6th, 2008 by reuben in arrhythmia Back Top Tags: card 392. Features of PACs vs. PVCs 394. An RV source for a PVC results in what morphology QRS? / What is a fusion beat? / What is an interpolated PVC? / What is the treatment for PVCs? / What is the Lown classification of PVCs? Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.