Background: The aim of this study was to determine whether perioperative stress hyperglycemia is correlated with surgical site infection (SSI) rates in non-diabetes mellitus (DM) patients undergoing elective colorectal resections within an SSI bundle.
Methods: American College of Surgeons National Surgical Quality Improvement Program data of patients treated at a single institution in 2006-2012 were supplemented by institutional review board-approved chart review. A multifactorial SSI bundle was implemented in 2009 without changing the preoperative 8-h nil per os, and in the absence of either a carbohydrate loading strategy or hyperglycemic management protocol. Hyperglycemia was defined as blood glucose level > 140 mg/dL. The primary endpoint was SSI defined by the Centers for Disease Control National Nosocomial Infections Surveillance.
Results: Of 690 patients included, 112 (16.2%) had pre-existing DM. Overall SSI rates were significantly higher in DM patients as compared to non-DM patients (28.7 vs. 22.3%, p = 0.042). Postoperative hyperglycemia was more frequently seen in non-DM patients (46 vs. 42.9%). The SSI bundle reduced SSI rates (17 vs. 29.3%, p < 0.001), but the rate of hyperglycemia remained unchanged for DM or non-DM patients (pre-bundle 59%; post-bundle 62%, p = 0.527). Organ/space SSI rates were higher in patients with pre- and postoperative hyperglycemia (12.6%) (p = 0.017). Overall SSI rates were higher in DM patients with hyperglycemia as compared to non-DM patients with hyperglycemia (35.6 vs. 20.8%, p = 0.002). At multivariate analysis DM, chronic steroid use, chemotherapy and SSI bundle were predictive factors for SSI.
Conclusions: This study showed that non-DM patients have a postoperative hyperglycemia rate as high as 46% in spite of the SSI bundle. A positive correlation was found between stress hyperglycemia and organ/space SSI rates regardless of the DM status. These data support the need for a strategy to prevent stress hyperglycemia in non-DM patients undergoing colorectal resections.
Keywords: Colorectal resection; Perioperative hyperglycemia; Surgical site infection.