Challenging the Paradigm: Long-Term Outcomes in Dialysis-Dependent Patients Undergoing CABG

Area of Science:

• Cardiovascular Surgery
• Nephrology
• Outcomes Research

Background:

• Coronary artery bypass grafting (CABG) in dialysis-dependent (DD) patients presents considerable challenges and poorer outcomes.
• Despite surgical advancements, DD patients remain a high-risk group with limited survival.
• Understanding the specific risks and benefits for DD patients undergoing CABG is crucial.

Purpose of the Study:

• To compare outcomes of CABG between dialysis-dependent (DD) and non-dialysis-dependent (NDD) patients.
• To identify predictors of mortality and major adverse cardiac and cerebrovascular events (MACCE) in DD patients.
• To evaluate the effectiveness of arterial grafting and the predictive accuracy of EuroSCORE II in this population.

Main Methods:

• Retrospective cohort study comparing 97 DD patients with 488 NDD controls from 2010-2015.
• Primary endpoint: all-cause mortality. Secondary endpoint: MACCE.
• Median follow-up of 5.4 years; analysis included risk factor identification and EuroSCORE II performance evaluation.

Main Results:

• DD patients exhibited significantly higher perioperative mortality (10.3% vs. 3.1%) and reduced 5-year overall survival (40.8% vs. 82.1%).
• Dialysis dependence increased mortality risk 8.4-fold and MACCE risk 2.6-fold.
• Arterial grafting did not improve survival in DD patients; EuroSCORE II showed poor discrimination for long-term survival.

Conclusions:

• Dialysis dependence is a strong independent predictor of adverse outcomes after CABG.
• Current risk stratification models like EuroSCORE II are inadequate for predicting long-term survival in DD patients.
• Development of dialysis-specific risk models and tailored surgical strategies is urgently needed for this high-risk population.