Restrictive annuloplasty or replacement on reverse remodeling for nonischemic dilated cardiomyopathy

Area of Science:

• Cardiology
• Cardiac Surgery
• Heart Failure Research

Background:

• The optimal surgical strategy for secondary mitral regurgitation (MR) in patients with nonischemic dilated cardiomyopathy (NIDCM) remains debated.
• This study investigates the efficacy of mitral annuloplasty versus mitral replacement in patients with advanced NIDCM and clinically significant secondary MR.

Purpose of the Study:

• To compare the effectiveness of mitral annuloplasty and mitral replacement in reducing left ventricular (LV) volumes post-surgery for secondary MR in NIDCM patients.
• To assess the impact of these surgical strategies on LV reverse remodeling and recurrent MR.

Main Methods:

• Retrospective review of 65 patients with NIDCM (LVEF < 40%) undergoing mitral surgery for secondary MR.
• Patients were divided into two groups: mitral annuloplasty (n=47) and mitral replacement (n=18).
• Primary endpoint was the postoperative reduction in indexed LV end-systolic volume (LVESVI).

Main Results:

• Mitral annuloplasty resulted in a significantly greater reduction in LVESVI at 6 months compared to mitral replacement (96 ± 59 vs. 154 ± 61 ml/m², P < 0.001).
• The annuloplasty group showed improved LVEF and a lower rate of moderate/severe recurrent MR (17% vs. 0%).
• Mitral annuloplasty was independently associated with favorable LV reverse remodeling (OR 6.10, P = 0.035).

Conclusions:

• Mitral annuloplasty is superior to mitral replacement in achieving LV reverse remodeling in NIDCM patients with secondary MR.
• These findings suggest mitral annuloplasty as a potentially preferred surgical option for managing secondary MR in this patient population.