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Research Article: Conventional cardiac resynchronization therapy upgrading and its effect on functional mitral regurgitation in patients with pacing-induced cardiomyopathy

Date Published: 2026-05-19

Abstract:
Data on the effects of conventional cardiac resynchronization therapy (CRT) upgrading by implantation of a left ventricular lead via the coronary sinus on functional mitral regurgitation (MR) in patients with pacing-induced cardiomyopathy are scarce. This analysis of the UPGRADE study, an investigator-initiated randomized controlled trial to evaluate the effect of conventional CRT on central sleep apnea, evaluated the significance of CRT on MR in all included patients. Differences in all-cause mortality were assessed in patients with significant MR during long-term follow-up. Overall, 54 patients were included in the trial. MR was found in the majority of patients [mild: n =?30 (55.6%), moderate: n =?15 (27.8%), severe: n =?6 (11.1%)], while “none/trace” MR was observed in only three (5.6%) patients. CRT was associated with a significant reduction in MR [“none/trace”: n =?5 (9.6%), mild: n =?37 (71.2%), moderate: n =?6 (11.5%), severe: n =?4 (7.7%); p =?0.035)] after 3–5 months, with all patients either having an improvement in MR grading or it remaining unchanged. Notably, only two patients with severe MR improved to either a mild or moderate level. CRT upgrading was linked to a significant amelioration of vena contracta width [2?mm (1.0–4.3) at baseline versus 2?mm (1.0–3.0) post-CRT; r?=?0.73, 95% CI 0.53–0.85, p <?0.001]. The presence of significant MR at baseline was associated with impaired survival during long-term follow-up [MR?<?2: n =?14 (42.4%), MR???2: n =?19 (90.5%); hazard ratio 0.25 (95% CI 0.12–0.54); log rank p <?0.001]. Conventional CRT upgrading in patients with pacing-induced cardiomyopathy was associated with significant improvement in MR grading. The presence of moderate or severe MR at baseline was associated with impaired outcomes during long-term follow-up, suggesting that these patients represent a high-risk cohort.

Introduction:
Data on the effects of conventional cardiac resynchronization therapy (CRT) upgrading by implantation of a left ventricular lead via the coronary sinus on functional mitral regurgitation (MR) in patients with pacing-induced cardiomyopathy are scarce.

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