Updated Echocardiographic Effects of Long Term Pacing on Left Ventricle and Left Atrial Function in Patients with Congenital Heart Block: Outflow Tract vs. Apical Pacing Sites

Abstract

Background: Pacing sites vary among symptomatic patients with congenital complete heart block (CHB) with right ventricle (RV) apex (Ap) and outflow tract (OT), both of which alter contractility, as commonly-cited lead implant locations. However, controversy exists as to the best site based on only ECHO-derived ejection fraction (EF) as a marker for contractility. With recent ECHO updates, the question now arises if use of other indices of left (L) V function offer advantages in comparing function between pacing sites. Objective: To compare newer LV functional ECHO …