Renal dysfunction and long-term risk of heart failure after coronary artery bypass grafting

Area of Science:

• Cardiology
• Nephrology
• Public Health

Background:

• Renal dysfunction is a known risk factor for adverse outcomes after coronary artery bypass grafting (CABG), including mortality and myocardial infarction.
• The long-term impact of renal dysfunction on heart failure development post-CABG requires further investigation.

Purpose of the Study:

• To examine the association between varying degrees of renal dysfunction and the long-term incidence of new-onset heart failure following primary isolated CABG.
• To identify renal function as a predictive factor for heart failure in patients undergoing CABG.

Main Methods:

• A cohort of 29,602 patients undergoing primary isolated CABG between 2000-2008 in Sweden was analyzed.
• Estimated glomerular filtration rate (eGFR) was calculated using the Modification of Diet in Renal Disease equation.
• Hazard ratios were computed to assess the risk of first hospitalization for heart failure based on eGFR levels.

Main Results:

• The study population had a mean age of 67 years, with 20% having an eGFR <60 mL/min/1.73 m².
• Over a mean follow-up of 4.5 years, 5.7% of patients (1,690) experienced heart failure.
• Patients with eGFR between 45-60, 30-45, and 15-30 mL/min/1.73 m² had significantly increased adjusted hazard ratios for heart failure (1.53, 2.08, and 2.14, respectively) compared to those with eGFR >60 mL/min/1.73 m².

Conclusions:

• Impaired renal function is a significant long-term predictor of new-onset heart failure after primary isolated CABG.
• These findings underscore the importance of assessing renal function in patients undergoing CABG to stratify heart failure risk.