Electrophysiologic and electroanatomic changes in the human atrium associated with age

Journal of the American College of Cardiology
Peter M KistlerJonathan M Kalman

Abstract

The purpose of this study was to characterize the pattern of atrial remodeling seen with human aging. Atrial fibrillation (AF) occurs in 3% to 4% of the population over 65 years of age. It is associated with thromboembolic complications, worsening heart failure, and increased mortality, yet the electrical and structural remodeling that occurs with human aging remains unknown. Thirteen patients (66.4 +/- 1.7 years) > or =60 years (group A), 13 patients (50 +/- 2.1 years) age 31 to 59 years (group B), and 15 patients (24.7 +/- 1.0 years) < or =30 years (group C) underwent conventional electrophysiologic studies and electroanatomic mapping. We measured atrial refractoriness (ERP) at the distal coronary sinus (CS); low and high lateral right atrium (LRA) and the high septal right atrium at 600, 500, and 400 ms; maximum corrected sinus node recovery time (CSNRT); P-wave duration (PWD); conduction time (CT) along the CS and LRA; and discrete double potentials (DP) along the crista. Aging was associated with an increase in atrial ERP, prolonged CT along the CS, increased PWD and CSNRT. There was no significant change in dispersion of refractoriness or rate adaptation. Electroanatomic mapping revealed diffuse areas of low voltage with ...Continue Reading

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