1978 Volume 42 Issue 8 Pages 961-970
Five cases of chronic acquired atrioventricular block were presented. Two cases (Cases 3 and 4) were thought to be primary block. Two other cases (Cases 1 and 2) were thought to be due to coronary sclerosis. One case (Case 5) was due to invasion of reticulosarcoma cells. Cases 1 and 2 showed bilateral bundle branch fibrosis, and cases 3 and 4, interruption of the penetrating portion of His bundle. In case 4, an abnormal conal muscle pressed against the His bundle. In case 5 reticulosarcoma cells invaded the S-A node, A-V node and bundle branches. Correlations between ECG and histology were discussed. The electrocardiographic finding were found to correlate well with the changes in the conduction system.
