Does Cardiac Function Improvement With Coronary Artery Bypass Grafting Reduce All-Cause Mortality?

Area of Science:

• Cardiology
• Cardiac Surgery
• Clinical Outcomes Research

Background:

• The impact of coronary artery bypass grafting (CABG) on cardiac function and life expectancy remains debated.
• Previous studies suggest improved cardiac function post-CABG may not translate to enhanced survival.

Purpose of the Study:

• To investigate if CABG improves cardiac function in patients with reduced left ventricular ejection fraction (LVEF).
• To determine the influence of CABG-induced cardiac function improvement on all-cause mortality.
• To compare patient prognosis based on preoperative cardiac function status.

Main Methods:

• Retrospective analysis of 166 patients with LVEF ≤35% who underwent CABG.
• Cardiac function improvement defined as a ≥10% increase in LVEF.
• Comparison of survival rates and prognosis between patients with and without LVEF improvement, and by preoperative LV dysfunction severity.

Main Results:

• Significant LVEF improvement observed post-CABG (28% to 39%).
• Patients with LVEF improvement of ≥10% had significantly better 7-year survival (85.9% vs. 63.5%, P=.001).
• Survival rates were similar between preoperative LVEF groups (≤25% vs. 25%-35%).

Conclusions:

• CABG can enhance cardiac function in over half of patients with ischemic cardiomyopathy.
• Improved LVEF following CABG correlates with improved all-cause mortality.
• Post-CABG LVEF improvement is a significant predictor of better patient prognosis.