Reversible cardiac dysfunction associated with physiologic high-rate dual-chamber pacing in an infant with acquired complete atrioventricular heart block

摘要

Progression of left ventricular end-diastolic dimension (LVEDD) based on diameter in cm and z-score, and ventricular function based on the biplane ejection fraction (EF) relative to the duration since pacemaker implantation (PMI). The start and discontinuation of atenolol is indicated by the in each graph. The transition in shading represents the change in the pacemaker upper tracking rate from 210 to 160 beats per minute (bpm).