Physiology of cardiac pacing in children: the importance of the ventricular pacing site

Pacing Clin Electrophysiol. 2008 Feb:31 Suppl 1:S24-7. doi: 10.1111/j.1540-8159.2008.00950.x.

Abstract

Children with congenital or acquired atrioventricular block are provided with ventricular rate support from a pacing lead that traditionally is positioned at the right ventricular (RV) apex. However, RV apical pacing causes dyssynchronous electrical activation and left ventricular (LV) contraction, resulting in decreased LV function. Chronic RV apical pacing leads to deterioration of LV function and morphology, resulting in cardiac failure in approximately 7% of children. This review describes the pathophysiology of pacing-induced dyssynchronous LV activation and contraction, especially as a result of chronic RV apical pacing. Furthermore, this review provides an overview of the possible alternative pacing sites, such as the RV outflow tract, His-bundle, LV apex, and biventricular pacing.

Publication types

  • Review

MeSH terms

  • Atrioventricular Block / congenital
  • Atrioventricular Block / physiopathology*
  • Atrioventricular Block / therapy*
  • Cardiac Pacing, Artificial / methods*
  • Child
  • Heart Conduction System / physiopathology*
  • Heart Ventricles / physiopathology*
  • Humans
  • Infant, Newborn
  • Myocardial Contraction
  • Ventricular Dysfunction, Left / congenital
  • Ventricular Dysfunction, Left / physiopathology*
  • Ventricular Dysfunction, Left / prevention & control*