Predictive Factors for Mortality Following Major Lower Extremity Amputation

Background Despite advances in techniques and care, major amputation bears a high risk for mortality. Previously identified factors associated with increased risk of mortality include amputation level, renal function, and pre-operative white cell count. Methods A single center retrospective chart review was conducted identifying patients who had undergone a major amputation. Chi-squared, t-testing, and Cox proportional hazard modeling were performed examining death at 6 months and 12 months. Results Factors associated with an increased risk of six-month mortality include age (OR 1.01-1.05, P < .001), sex (OR 1.08-3.24, P < .01), minority race (OR 1.18-18.19, P < .01), chronic kidney disease (OR 1.40-6.06, P < .001), and use of pressors at the induction of anesthesia for index amputation (OR 2.09-7.85, P < .000). Factors associated with increased risk of 12 month mortality were similar. Discussion Patients undergoing major amputation continue to suffer high mortality. Those patients who received their amputation under physiologically stressful conditions were more likely to die within 6 months. Reliably predicting six-month mortality can assist surgeons and patients in making appropriate care decisions.