New-onset intra-operative hyperthermia in a large surgical patient population: A retrospective observational study
BACKGROUND Intra-operative hypothermia has been extensively investigated. However, the incidence of intraoperative hyperthermia has not been investigated in detail.
OBJECTIVE The main objective of this study was to assess the incidence and risk factors of new-onset intra-operative hyperthermia in a large surgical patient population.
DESIGN Retrospective database review.
SETTING Tertiary-care teaching hospital.
PATIENTS Patients undergoing surgery with general anaesthesia between 1 January 2002 and 31 December 2017 were included.
MAIN OUTCOME MEASURES The primary outcome measurement was new-onset intra-operative hyperthermia (>37.5℃). A logistic regression model was fitted to identify risk factors for intra-operative hyperthermia.
RESULTS A total of 103 648 patients were included in the final analyses. The incidence of new-onset hyperthermia in the overall patient cohort was 6.45%, reaching 20 to 30% after prolonged (>8 h) surgery, and was up to 26.5% in paediatric patients. The use of forced air active patient warming, larger amounts of fluid administration, longer surgery, younger age and smaller body size were all independently associated with intra-operative hyperthermia. The adoption of the Surgical Care Improvement Project (SCIP) temperature measures was associated with an increased incidence of intra-operative hyperthermia.
CONCLUSION Mild intra-operative hyperthermia is not uncommon particularly in longer procedures and small children.