ASSOCIATION BETWEEN COMPLICATIONS AND DEATH WITHIN 30 DAYS AFTER ORTHOPEDIC SURGERY: A VASCULAR EVENTS IN NONCARDIAC SURGERY PATIENTS COHORT EVALUATION (VISION) SUBSTUDY (Preprint)

BACKGROUND: The contemporary causes of postoperative mortality in orthopedic surgery are not well characterized. OBJECTIVE: The objective was to describe the epidemiology of postoperative complications among adult orthopedic surgery patients and inform their relationships with 30-day mortality. METHODS: Vascular Events in Noncardiac Surgery Patients Cohort Evaluation (VISION) was a prospective cohort study involving 40,004 adult patients who underwent noncardiac surgery across 28 centres in 14 countries. For the subset of orthopedic surgery patients, a Cox proportional hazards model was used to determine time-dependent associations between various surgical complications and 30-day postoperative mortality. Analyses were adjusted for preoperative and surgical variables. RESULTS: Among 8385 patients who underwent an orthopedic surgery in VISION, 132 (1.6%) patients died within 30 days of surgery. Of these deaths, 84 (63.6%) occurred in hospital during the index hospitalization, while 48 (36.4%) deaths occurred after discharge. The incidence of death across the subcategories of orthopedic surgery was: above knee amputation (30/221, 13.6%), internal fixation of femur (29/750, 3.9%), lower leg amputation (9/252, 3.6%), major hip or pelvic surgery (49/2898, 1.7%), major spine surgery (8/1405, 0.6%), and knee arthroplasty (7/2876, 0.2%). Six postoperative complications (myocardial injury after noncardiac surgery MINS, major bleeding, infection without sepsis, sepsis, stroke, atrial fibrillation) were associated with death on adjusted analyses. The greatest attributable fraction of postoperative mortality (i.e., proportion of deaths in the cohort that can be attributed to each complication, if causality were established) were from MINS (N=1454, 17.3%, hazard ratio HR 2.08, 95% confidence interval CI 1.38-3.14, P<.001, attributable fraction 20.7%), major bleeding (N=2422, 28.9%, HR 1.95, 95%CI 1.34-2.85, P<.001, attributable fraction 16.5%), and sepsis (N=318, 3.8%, HR 6.24, 95%CI 3.85-10.12, P<.001, attributable fraction 9.7%). CONCLUSIONS: The complications most attributable to 30-day mortality following orthopedic surgery were MINS, major bleeding, and sepsis. These findings highlight areas for further study to mitigate perioperative mortality in orthopedic surgery. MINS demonstrated the highest attributable fraction for mortality (20.7%), emphasizing the importance of appropriate MINS screening, diagnosis and management.