1988 Volume 34 Issue 3 Pages 344-356
Sixty-one patients with intra -His bundle (BH) block were studied, comparing to patients with A-H and H-V block. Postmortem pathological examinations were performed in 4 patients with BH block. In 160 cases of advanced or complete A-V block, BH block was found in 61 cases (38%) and was generally recognized in elderly women. According to the ECG findings, most patients with BH block showed narrow QRS complex, but the increasing ratio of heart rate was poor during exercise and after the administration of atropine sulfate. Adams-Stokes attack was found in 32 cases (52%) of these patients. The prognosis after implanting pacemakers was relatively satisfactory. Postmortem examination revealed the presence of interruptive lesions in the mid portion and distal His bundle along with proximal bundle branches. In conclusion, BH block was similar to H-V block in clinical severity, and this may explain the fact that the lesion was sometimes extended to bundle branches.
