Bedside recordings of His-bundle electrograms using conventional twelve-lead surface electrocardiography.

Introduction: Endocavitary His-bundle electrograms are usually recorded using high fidelity amplifiers and special filters. Methods and Results: To evaluate whether similar recordings could be obtained using a 12-lead surface electrocardiograph, we compared recordings obtained during an electrophysiologic study in 33 patients to those obtained by connecting the two poles of the bipolar catheter, used during the study as the His catheter, to the right and left arm leads of the surface electrocardiograph. We recorded His-bundle electrograms using both techniques in all patients. There were no differences in measurements obtained between the two techniques. Conclusion: His-bundle electrograms can be recorded reliably with a conventional electrogram without sophisticated systems.