Effect of Intra-Operative Hypothermia on Post-Operative Morbidity in Patients with Colorectal Cancer

Background: Current guidelines recommend maintaining intra-operative normothermia to avoid surgical site infections (SSI) after colorectal cancer surgery. The aim of this study was to assess whether compliance with normothermia as part of temperature management measures is an effective strategy to reduce post-operative SSI and complications. Patients and Methods: This was a cohort study of patients undergoing surgery for primary colorectal cancer in 2011-2017 in a large teaching hospital in which temperature management using the Bair Hugger (TM) system (3M (TM) Center, St. Paul, MN) was standard care. Data from the prospective Dutch Surgical Audit (DCRA) database were complemented by highly granular intra-operative central body temperature data. A multivariable logistic regression model was used. Results: A total of 1,015 patients undergoing surgery for primary colorectal cancer were included. Temperature outcomes for the entire study cohort were as follows: mean temperature was 36.3 degrees C (standard deviation [SD] +/- 0.5 degrees C), median temperature nadir was 35.8 degrees C (interquartile range [IQR] 35.6 degrees C-36.1 degrees C), median percentage of time at nadir was 2.0% (IQR 0.8%-10.7%), and median percentage of time less than 36.0 degrees C was 1.0% (IQR 0.0%-33.3%). Thirty-day SSI rate was 10% (n = 101). Logistic regression models adjusting for gender, diabetes mellitus, body mass index (BMI), rectal cancer, duration of surgery, open surgery, emergency surgery, and period of surgery showed no association between any of the four temperature outcomes and SSI. Multivariable analysis also failed to show an association between intra-operative hypothermia and 30-day complications, mortality, or re-admission. Conclusions: In a hospital in which temperature management is standard care, intra-operative hypothermia and SSI rates in patients undergoing colorectal cancer surgery were low. Compliance with normothermia appears to be an effective strategy to reduce SSI.