Abstract
During several weeks' time the ECG's of a patient showed a Mobitz type 2, A-V block, and a combined CRBBB and marked left axis deviation (LAH). Finally a record was obtained exhibiting CRBBB combined with either LAH or LPH. This last tracing was interpreted as an example of the occurrence of an “intraventricular trifascicular block.” The patient died four days later in cardiac arrest. The peculiar pattern of transition from LAH to LPH is discussed and it is concluded that it clearly points to a Wenckebach phenomenon in the posterior division of the bundle branch, a conduction defect not hitherto described.
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