부산대학교 도서관

Background: Cardiac resynchronization therapy (CRT) is indicated for patients with heart failure with reduced left ventricular ejection fraction (LVEF) and chronic right ventricular (RV) pacing burden ≥40% (pacing‐induced cardiomyopathy, PICM). It is uncertain whether baseline RV pacing burden impacts response to CRT. Methods: We conducted a retrospective study of all CRT upgrades for PICM at our hospital from January 2017 to December 2018. Univariate and multivariable‐adjusted changes in LVEF, and echocardiographic response (≥10% improvement in LVEF) at 3–12 months post‐CRT upgrade were compared in those with RV pacing burden ≥90% versus <90%. Results: We included 75 patients (age 74 ± 11 years, 71% male) who underwent CRT upgrade for PICM. The baseline RV pacing burden was ≥90% in 56 patients (median 99% [IQR 98%–99%]), and <90% in 19 patients (median 79% [IQR 73%–87%]). Improvement in LVEF was greater in those with baseline RV pacing burden ≥90% versus <90% (15.7 ± 9.3% vs. 7.5 ± 9.6%, p =.003). Baseline RV pacing burden ≥90% was a strong predictor of an improvement in LVEF ≥10% after CRT upgrade both in univariate and multivariate‐adjusted models (p =.005 and.02, respectively). Conclusion: A higher baseline RV pacing burden predicts a greater improvement in LVEF after CRT upgrade for PICM. [ABSTRACT FROM AUTHOR]