Long-term impact of diabetes and its comorbidities in patients undergoing isolated primary coronary artery bypass...

Area of Science:

• Cardiology
• Diabetology
• Surgical Outcomes

Background:

• Coronary artery bypass graft (CABG) surgery is a common procedure for advanced coronary artery disease.
• The influence of diabetes and its associated comorbidities on long-term survival after CABG requires further elucidation.
• Comorbidities such as chronic renal failure, peripheral vascular disease, and low ejection fraction may affect patient outcomes.

Purpose of the Study:

• To investigate the impact of diabetes and specific comorbidities on the long-term survival of patients undergoing CABG surgery.
• To identify independent risk factors for late cardiac death in patients with and without diabetes after CABG.

Main Methods:

• A unicenter study analyzed 9125 patients who survived isolated CABG surgery between 1992 and 2002.
• Patients were categorized into nondiabetic, noninsulin-dependent diabetes mellitus (NIDDM), and insulin-dependent diabetes mellitus (IDDM) groups.
• Survival analysis was performed to assess cardiac-specific survival and freedom from cardiac-related death, considering comorbidities.

Main Results:

• Cardiac-specific survival was lower in IDDM patients compared to nondiabetic and NIDDM patients.
• Freedom from cardiac death was similar for NIDDM and nondiabetic patients up to 6 years post-CABG, but lower thereafter.
• IDDM, chronic renal failure, peripheral vascular disease, and low ejection fraction were independent predictors of late cardiac death (all P<0.0001).

Conclusions:

• Noninsulin-dependent diabetes mellitus is not an independent predictor of late cardiac death after CABG, with similar survival to nondiabetic patients for 6 years.
• The need for insulin therapy, presence, and number of comorbidities (chronic renal failure, peripheral vascular disease, low ejection fraction) adversely affect cardiac survival in both diabetic and nondiabetic patients.