The clinical value of the His-bundle electrogram in intraventricular conduction defects.

A study concerned with the clinical significance of the His-bundle ECG was carried out in association with upper atrial stimulation in 20 patients with intraventricular conduction defect. On the ground of the results the His-bundle ECG is regarded as a procedure of diagnostic value in intraventricular conduction defects by contributing to the accuracy of information on the severity and extent of the lesion. In the framework of published observations, including the present findings, questions relating to prognosis and to the necessity for pacing in bifascicular block are discussed.