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

S Serge Barold, Harry G Mond
Journal of Arrhythmia 2023 December
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.

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