The role of pre-operative and post-operative glucose control in surgical-site infections and mortality

• Published in: PloS one 2012-09, Vol.7 (9), p.e45616-e45616
• Main Authors: Jeon, Christie Y, Furuya, E Yoko, Berman, Mitchell F, Larson, Elaine L
• Format: Article
• Language: English
• Subjects: Analysis; Anesthesiology; Biology; Blood Glucose - analysis; Blood transfusion; Body mass; Body mass index; Body size; Clinical medicine; Coefficient of variation; Cross infection; Data processing; Death; Diabetes; Diabetes mellitus; Emergency procedures; Endocrinology; Fatalities; Female; Glucose; Health aspects; Hemoglobin; Hospital patients; Hospitals; Humans; Hyperglycemia; Hypoglycemia; Infections; Infectious diseases; Logistic Models; Male; Medicine; Middle Aged; Mortality; Nursing schools; Postoperative Period; Preoperative Period; Prevention; Regression analysis; Regression models; Retrospective Studies; Risk analysis; Studies; Surgery; Surgical outcomes; Surgical site infections; Surgical Wound Infection - blood; Surgical Wound Infection - mortality; Transfusion; Variability
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0045616

The impact of glucose control on surgical-site infection (SSI) and death remains unclear. We examined how pre- and post-operative glucose levels and their variability are associated with the risk of SSI or in-hospital death. This retrospective cohort study employed data on 13,800 hospitalized patients who underwent a surgical procedure at a large referral hospital in New York between 2006 and 2008. Over 20 different sources of electronic data were used to analyze how thirty-day risk of SSI and in-hospital death varies by glucose levels and variability. Maximum pre- and post-operative glucose levels were determined for 72 hours before and after the operation and glucose variability was defined as the coefficient of variation of the glucose measurements. We employed logistic regression to model the risk of SSI or death against glucose variables and the following potential confounders: age, sex, body mass index, duration of operation, diabetes status, procedure classification, physical status, emergency status, and blood transfusion. While association of pre- and post-operative hyperglycemia with SSI were apparent in the crude analysis, multivariate results showed that SSI risk did not vary significantly with glucose levels. On the other hand, in-hospital deaths were associated with pre-operative hypoglycemia (OR = 5.09, 95% CI (1.80, 14.4)) and glucose variability (OR = 1.14, 95% CI (1.03, 1.27) for 10% increase in coefficient of variation). In-hospital deaths occurred more often among those with pre-operative hypoglycemia and higher glucose variability. These findings warrant further investigation to determine whether stabilization of glucose and prevention of hypoglycemia could reduce post-operative deaths.