Edin Mujagic1, Walter R Marti2, Michael Coslovsky3, Savas D Soysal4, Robert Mechera4, Marco von Strauss2, Jasmin Zeindler4, Franziska Saxer5, Alexandra Mueller2, Christoph A Fux6, Christoph Kindler7, Lorenz Gurke4, Walter P Weber4. 1. Department of Surgery, University of Basel and University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland. edin.mujagic@usb.ch. 2. Department of Surgery, Kantonsspital Aarau, Tellstrasse 15, 5001, Aarau, Switzerland. 3. Clinical Trial Unit, University of Basel and University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland. 4. Department of Surgery, University of Basel and University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland. 5. Department of Orthopedic Trauma Surgery, University of Basel and University Hospital Basel, Spitalstrasse 21, 4031, Basel, Switzerland. 6. Department of Infectious Diseases and Hospital Hygiene, Kantonsspital Aarau, Tellstrasse 15, 5001, Aarau, Switzerland. 7. Department of Anesthesiology, Kantonsspital Aarau, Tellstrasse 15, 5001, Aarau, Switzerland.
Abstract
BACKGROUND: Surgical site infections (SSI) are a major cause of morbidity and mortality in surgical patients. Postoperative and total hospital length of stay (LOS) are known to be prolonged by the occurrence of SSI. Preoperative LOS may increase the risk of SSI. This study aims at identifying the associations of pre- and postoperative LOS in hospital and intensive care with the occurrence of SSI. METHODS: This observational cohort study includes general, orthopedic trauma and vascular surgery patients at two tertiary referral centers in Switzerland between February 2013 and August 2015. The outcome of interest was the 30-day SSI rate. RESULTS: We included 4596 patients, 234 of whom (5.1%) experienced SSI. Being admitted at least 1 day before surgery compared to same-day surgery was associated with a significant increase in the odds of SSI in univariate analysis (OR 1.65, 95% CI 1.25-2.21, p < 0.001). More than 1 day compared to 1 day of preoperative hospital stay did not further increase the odds of SSI (OR 1.08, 95% CI 0.77-1.50, p = 0.658). Preoperative admission to an intensive care unit (ICU) increased the odds of SSI as compared to hospital admission outside of an ICU (OR 2.19, 95% CI 0.89-4.59, p = 0.057). Adjusting for potential confounders in multivariable analysis weakened the effects of both preoperative admission to hospital (OR 1.38, 95% CI 0.99-1.93, p = 0.061) and to the ICU (OR 1.89, 95% CI 0.73-4.24, p = 0.149). CONCLUSION: There was no significant independent association between preoperative length of stay and risk of SSI while SSI and postoperative LOS were significantly associated.
BACKGROUND: Surgical site infections (SSI) are a major cause of morbidity and mortality in surgical patients. Postoperative and total hospital length of stay (LOS) are known to be prolonged by the occurrence of SSI. Preoperative LOS may increase the risk of SSI. This study aims at identifying the associations of pre- and postoperative LOS in hospital and intensive care with the occurrence of SSI. METHODS: This observational cohort study includes general, orthopedic trauma and vascular surgery patients at two tertiary referral centers in Switzerland between February 2013 and August 2015. The outcome of interest was the 30-day SSI rate. RESULTS: We included 4596 patients, 234 of whom (5.1%) experienced SSI. Being admitted at least 1 day before surgery compared to same-day surgery was associated with a significant increase in the odds of SSI in univariate analysis (OR 1.65, 95% CI 1.25-2.21, p < 0.001). More than 1 day compared to 1 day of preoperative hospital stay did not further increase the odds of SSI (OR 1.08, 95% CI 0.77-1.50, p = 0.658). Preoperative admission to an intensive care unit (ICU) increased the odds of SSI as compared to hospital admission outside of an ICU (OR 2.19, 95% CI 0.89-4.59, p = 0.057). Adjusting for potential confounders in multivariable analysis weakened the effects of both preoperative admission to hospital (OR 1.38, 95% CI 0.99-1.93, p = 0.061) and to the ICU (OR 1.89, 95% CI 0.73-4.24, p = 0.149). CONCLUSION: There was no significant independent association between preoperative length of stay and risk of SSI while SSI and postoperative LOS were significantly associated.
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