Outcomes After the MitraClip Procedure in Patients at Very High Risk for Conventional Mitral Valve Surgery

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiac Surgery

Background:

• Severe symptomatic mitral regurgitation (MR) affects many patients, with approximately 50% deemed too high-risk for conventional surgical repair or replacement.
• The MitraClip procedure has emerged as a less invasive alternative for this high-risk patient group.
• Assessing outcomes is crucial at institutions with established mitral valve surgery programs.

Purpose of the Study:

• To evaluate the clinical outcomes and survival rates of patients with severe symptomatic mitral regurgitation who underwent the MitraClip procedure.
• To compare these outcomes within an institution that routinely performs mitral valve surgery.
• To identify predictors of mortality in this patient cohort.

Main Methods:

• A retrospective analysis was conducted on 50 consecutive patients who received the MitraClip procedure.
• Data collected included baseline characteristics, perioperative outcomes, and follow-up echocardiographic and clinical data.
• Survival was the primary endpoint, with secondary endpoints including technical success, reoperation, symptom status, and mortality.

Main Results:

• The study included elderly patients (average age 83) with high surgical risk (STS score 9.4%) and severe MR (86% with 4+ MR).
• The MitraClip procedure resulted in significant reduction of MR in most patients (86% achieved 2+ or less MR).
• One- and two-year survival rates were 75% and 63%, respectively. Higher STS predicted risk and prior cardiac surgery were associated with increased mortality.

Conclusions:

• The MitraClip procedure is a viable and effective treatment option for patients with severe mitral regurgitation who are unsuitable for open-heart surgery.
• The procedure demonstrated technical success in most patients, with acceptable postoperative outcomes and survival.
• These findings support the use of MitraClip in high-risk MR patients, even in centers with robust surgical programs.