Long-term glycemic control and postoperative infectious complications

Area of Science:

• Surgical Outcomes Research
• Diabetes Management
• Infectious Disease Prevention

Background:

• Postoperative infections are a significant cause of morbidity and mortality.
• Optimal glycemic control is hypothesized to reduce surgical site infections.
• Previous studies have suggested a link between elevated HbA1c and adverse surgical outcomes.

Purpose of the Study:

• To investigate the association between preoperative glycemic control (HbA1c levels) and the incidence of postoperative infectious complications.
• To determine if achieving an HbA1c level below 7% is associated with a reduced risk of infection after major noncardiac surgery.

Main Methods:

• Retrospective observational study utilizing Veterans Affairs National Surgical Quality Improvement Program data.
• Analysis of 490 diabetic patients undergoing major noncardiac surgery.
• Multivariable logistic regression to assess the association of HbA1c levels and other factors with infectious complications.

Main Results:

• Preoperative HbA1c levels <7% were significantly associated with decreased infectious complications (adjusted odds ratio, 2.13; P=.007).
• Factors including age, ASA class, operation length, and wound class were also significantly associated with postoperative infections.
• Emergency/urgent cases and ADL dependence were not significant in the multivariable model.

Conclusions:

• Good preoperative glycemic control, defined as HbA1c <7%, is independently associated with a lower risk of postoperative infectious complications.
• Achieving target glycemic control before surgery is a critical factor in improving patient safety and outcomes.
• These findings support the implementation of strategies to optimize glycemic control in diabetic patients undergoing surgery.