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RBBB and LAFB. Is it trifascicular block? The complexities of Wenckebach, with Ken Grauer analysis.

Dr. Smith's ECG Blog

That said — I strongly suspect that instead of AFib — that this patient was in the same 2nd-Degree, Mobitz I AV Block on the pre-operative ECG , that was done 2 months earlier ( = ECG #2 in Figure-4 ). That said — the term, “trifascicular block” is no longer recommended ( Surawicz et al, Circulation — AHA/ACCF/HRS Recs, 2009 ).