Coronary artery bypass grafting alone for advanced ischemic left ventricular dysfunction with significant mitral...

Area of Science:

• Cardiology
• Cardiac Surgery
• Cardiovascular Research

Background:

• Ischemic left ventricular dysfunction often coexists with mitral regurgitation.
• The optimal management strategy for this combined condition remains debated.
• Revascularization's impact on ischemic mitral regurgitation requires further investigation.

Purpose of the Study:

• To assess the outcomes of isolated coronary artery bypass grafting in patients with ischemic left ventricular dysfunction and mitral regurgitation.
• To evaluate the effect of myocardial revascularization on mitral regurgitation severity and left ventricular function.
• To identify predictors of late mortality after revascularization in this patient cohort.

Main Methods:

• Retrospective analysis of 31 consecutive patients undergoing coronary bypass grafting alone.
• Assessment of preoperative and postoperative New York Heart Association functional class, left ventricular ejection fraction, and mitral regurgitation severity.
• Midterm follow-up to evaluate cardiac death and functional outcomes.

Main Results:

• All patients survived the operation with significant improvements in functional class (3.64 to 1.32), ejection fraction (0.25 to 0.43), and mitral regurgitation (2.87 to 1.35).
• Five late cardiac deaths occurred; postoperative ejection fraction and mitral regurgitation correlated with late mortality.
• No preoperative variables predicted late death.

Conclusions:

• Isolated coronary bypass grafting can significantly improve ischemic mitral regurgitation and left ventricular function.
• Myocardial revascularization alone may be sufficient for managing ischemic mitral regurgitation, even if severe.
• Mitral valve intervention should be reserved for cases with organic valvular disease, not solely for ischemic dysfunction.