Pseudo-2:1 bundle branch block. "Fusion causes confusion".

Published in: Journal of arrhythmia (2023)

The fusion of narrow-QRS sinus-generated beats with end-diastolic ventricular extrasystoles occurring in bigeminy can produce an electrocardiographic pattern difficult to differentiate from parasystole. Such an ECG should not be interpreted as 2:1 RBBB because of the variability of the PR intervals.

Keyphrases

left ventricular
cardiac resynchronization therapy
heart failure
blood pressure
left atrial
heart rate variability
heart rate
ejection fraction
atrial fibrillation