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Ventricular tachycardia in 4 patients evaluated by programmed electrical stimulation of heart and treated in 2 patients by surgical division of anterior radiation of left bundle-branch.

Four patients with intractable ventricular tachycardia have been studied using His bundle electrograms and programmed electrical stimulation of the heart. A re-entry mechanism occurring in the main bundle-branches has been shown to be the most likely basis for the tachycardias. As a result of the deductions madefrom the electrophysiological studies, 2 patients underwent section of the anterior radiation of the left bundle-branch during open heart surgery to correct other cardiac lesions, in an attempt to interrupt the re-entry circuit.