Physiologic Variants of Cardiac Conduction (Aberration, Gap, Supernormal Conduction)

William M Miles; Philip George

doi:10.1016/j.ccep.2021.07.002

Physiologic Variants of Cardiac Conduction (Aberration, Gap, Supernormal Conduction)

Card Electrophysiol Clin. 2021 Dec;13(4):607-624. doi: 10.1016/j.ccep.2021.07.002. Epub 2021 Sep 25.

Authors

William M Miles¹, Philip George²

Affiliations

¹ University of Florida College of Medicine, 1329 S.W. 16th Avenue, PO Box 100288, Gainesville, Florida 32608, USA. Electronic address: william.miles@medicine.ufl.edu.
² University of Florida College of Medicine, 1329 S.W. 16th Avenue, PO Box 100288, Gainesville, Florida 32608, USA.

PMID: 34689890
DOI: 10.1016/j.ccep.2021.07.002

Abstract

Wide QRS complexes during supraventricular rhythms can be caused by fixed bundle branch block, functional (intermittent) bundle branch block, preexcitation, or toxic/metabolic causes. Functional bundle branch block can be caused by long-short aberrancy (usually physiologic), or acceleration/deceleration dependent aberrancy (usually pathologic). Electrocardiogram criteria have been proposed to differentiate aberration from ventricular tachycardia; they are not always accurate. The gap phenomenon "paradox" is that with increasingly premature extrastimuli, progressive proximal conduction delay allows time for distal recovery of excitability. Supernormal conduction may explain unusual conduction phenomena in patients with abnormal His-Purkinje function or poorly conducting accessory pathways.

Keywords: Aberration; Bundle branch block; Gap phenomenon; Long-short aberration; Rate-dependent aberration; Supernormal conduction.

Publication types

Review

MeSH terms

Arrhythmias, Cardiac
Bundle of His
Bundle-Branch Block
Electrocardiography
Heart Conduction System*
Humans
Pre-Excitation Syndromes*