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Obesity in diabetic patients undergoing coronary artery bypass graft surgery is associated with increased
Wei Pan1, Katja Hindler, Vei-Vei Lee
1Baylor College of Medicine, The Texas Heart Institute at St.Luke's Episcopal Hospital, Houston, Texas 77030, USA. wpan@heart.thi.tmc.edu
Insights
Obesity increases adverse outcomes for diabetic patients after coronary artery bypass surgery, but not for nondiabetic patients. This highlights the importance of managing weight in diabetic individuals undergoing cardiac procedures.
Area of Science:
- Cardiovascular Surgery
- Metabolic Disease Research
- Surgical Outcomes Analysis
Background:
- Obesity is a known cardiovascular disease risk factor.
- Previous studies yielded conflicting results on obesity's impact on coronary artery bypass graft (CABG) surgery outcomes in nondiabetic patients.
- The influence of obesity on postoperative outcomes in diabetic versus nondiabetic patients undergoing CABG requires further investigation.
Purpose of the Study:
- To investigate the independent association between obesity and adverse postoperative outcomes in patients undergoing primary coronary artery bypass surgery.
- To compare these outcomes between diabetic and nondiabetic patient populations.
- To identify specific complications linked to obesity in the context of CABG surgery.
Main Methods:
- Retrospective cohort study of 9,862 patients undergoing primary CABG surgery.
- Patients were stratified by diabetes status and categorized into five body mass index (BMI) groups: normal weight, overweight, mild, moderate, and morbid obesity.
- Multivariate logistic regression analysis was employed, controlling for demographic, medical history, and medication variables.
Main Results:
- Obesity was not independently associated with increased adverse outcomes in nondiabetic patients.
- In diabetic patients, obesity was independently linked to significantly higher risks of respiratory failure, ventricular tachycardia, atrial fibrillation, atrial flutter, renal insufficiency, and leg wound infection.
- Obesity in diabetic patients did not independently increase the risk of mortality, stroke, myocardial infarction, sepsis, or sternal wound infection.
Conclusions:
- Obesity is an independent predictor of poorer postoperative outcomes in diabetic patients following primary CABG surgery.
- The findings underscore the critical need for careful management of obesity in diabetic patients scheduled for cardiac surgery.
- Further research may explore targeted interventions to mitigate obesity-related risks in this vulnerable patient group.
Background:
Despite the fact that obesity is a known risk factor for cardiovascular disease, many studies have failed to demonstrate that obesity is independently associated with an increased risk of cardiovascular morbidity and mortality in nondiabetic patients undergoing coronary artery bypass graft surgery. The authors investigated the influence of obesity on adverse postoperative outcomes in diabetic and nondiabetic patients after primary coronary artery bypass surgery.
Methods:
A retrospective cohort study of patients undergoing primary coronary artery bypass surgery (n = 9,862) between January 1995 and December 2004 at the Texas Heart Institute was performed. Diabetic (n = 3,374) and nondiabetic patients (n = 6,488) were classified into five groups, according to their body mass index: normal weight (n = 2,148), overweight (n = 4,257), mild obesity (n = 2,298), moderate obesity (n = 785), or morbid obesity (n = 338). Multivariate, stepwise logistic regression was performed controlling for patient demographics, medical history, and preoperative medications to determine whether obesity was independently associated with an increased risk of adverse postoperative outcomes.
Results:
Obesity in nondiabetic patients was not independently associated with an increased risk of adverse postoperative outcomes. In contrast, obesity in diabetic patients was independently associated with a significantly increased risk of postoperative respiratory failure (odds ratio [OR], 2.26; 95% confidence interval [CI], 1.41-3.61; P < 0.001), ventricular tachycardia (OR, 2.27; 95% CI, 1.18-4.35; P < 0.02), atrial fibrillation (OR, 1.56; 95% CI, 1.03-2.38; P < 0.04), atrial flutter (OR, 2.38; 95% CI, 1.29-4.40; P < 0.01), renal insufficiency (OR, 1.66; 95% CI, 1.10-3.41; P < 0.03), and leg wound infection (OR, 5.34; 95% CI, 2.27-12.54; P < 0.001). Obesity in diabetic patients was not independently associated with an increased risk of mortality, stroke, myocardial infarction, sepsis, or sternal wound infection.
Conclusion:
Obesity in diabetic patients is an independent predictor of worsened postoperative outcomes after primary coronary artery bypass graft surgery.
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