Electron Microscopic Comparison of Radial Artery Grafts in Non-Diabetic and Diabetic Coronary Bypass Patients

Area of Science:

• Vascular Surgery
• Diabetology
• Histopathology

Background:

• Radial artery grafts are commonly used in coronary artery bypass grafting.
• Diabetes mellitus is a known risk factor for vascular complications.
• The impact of diabetes on radial artery graft histology requires further investigation.

Purpose of the Study:

• To compare electron microscopic histologic changes in radial artery grafts between non-diabetic and diabetic patients.
• To identify risk factors associated with histologic changes in radial artery grafts among diabetic patients.

Main Methods:

• Thirty-six patients were categorized into three groups: non-diabetic, type 2 diabetes with HbA1c <7.5%, and type 2 diabetes with HbA1c >7.5%.
• Distal radial artery grafts were evaluated using scanning electron microscopy by two blinded histologists.
• Electron microscopic scores were statistically compared across the groups.

Main Results:

• Significant differences in radial artery electron microscopic scores were observed between all three patient groups (p < 0.05).
• Linear regression analysis identified the duration of diabetes mellitus and fasting plasma glucose levels as independent risk factors for graft histologic changes.
• Poor glycemic control (HbA1c >7.5%) was associated with more pronounced graft alterations.

Conclusions:

• Duration of diabetes mellitus and poor glycemic control are associated with significant electron microscopic changes in radial artery grafts.
• These findings highlight the detrimental effect of diabetes on vascular graft integrity.
• Further research may explore strategies to mitigate these changes in diabetic patients undergoing bypass surgery.