[Bifascicular block: its course and prognostic significance in 52 cases followed-up for 15 years]

The authors report the results of a 15 years follow-up in a group of 52 patients with right bundle branch block and left anterior hemiblock. The incidence of complete AV block and sudden death in this group is compared to the one observed in a suitable control group. Among the bifascicular block group there was only one sudden death and one case of complete AV block. However, the groups did not differ statistically for mortality rates and average survival time. The authors suggest that bifascicular blocks should be regarded as a mere risk factor for complete AV block.