Impact of hyperglycemia on perioperative mortality after coronary artery bypass graft surgery

Area of Science:

• Cardiovascular Surgery
• Metabolic Disorders
• Clinical Risk Stratification

Background:

• The impact of perioperative hyperglycemia and diabetes on outcomes after coronary artery bypass graft (CABG) surgery remains incompletely understood.
• Accurate risk stratification is crucial for optimizing patient care and resource allocation in complex surgical procedures like CABG.

Purpose of the Study:

• To investigate the association between perioperative hyperglycemia and in-hospital mortality following CABG surgery.
• To determine if hyperglycemia poses a risk for mortality in both diabetic and nondiabetic patients undergoing CABG.

Main Methods:

• A prospective, observational study involving 5050 patients undergoing CABG surgery with cardiopulmonary bypass across 70 international centers.
• Collected data included 7500 variables per patient, with central adjudication of outcomes.
• Postoperative blood glucose levels (days 0-3) and multivariable logistic regression were used to analyze the association between hyperglycemia and hospital mortality in 4799 patients.

Main Results:

• Overall in-hospital mortality was 3.2% (164 deaths).
• Nondiabetic patients with maximum postoperative glucose levels of 250-300 mg/dL or ≥300 mg/dL exhibited significantly increased mortality risk compared to those with levels <200 mg/dL.
• Postoperative insulin treatment was also an independent risk factor for mortality in nondiabetic patients. Hyperglycemia was not associated with increased mortality in diabetic patients.

Conclusions:

• Perioperative hyperglycemia is a significant independent risk factor for increased in-hospital mortality specifically in nondiabetic patients after CABG surgery.
• The findings suggest that glycemic control strategies may be particularly important for nondiabetic patients undergoing CABG to mitigate mortality risk.