Abstract Objective To identify predictors of length of stay(LOS) after lumbar spine surgery.Methods Retrospective analysis was made on the clinical data of patients who were underwent open,posterior lumbar instrumented fusion with decompression by the orthopedic spine service at one institution between May 2016 and May 2017.LOS was determined from the date of surgery to the date of discharge.Predictors of LOS were investigated with a multivariate stepwise regression model,including pre-surgery factors(patient demographics,American Society of Anesthesiologists score and major medical comorbidities including diabetes,hypertension,pulmonary disease,heart disease or renal insufficiency) and perioperative factors(estimated blood loss,blood transfusion,fluids administered,surgery time,the methods of decompression,number of levels fused,drainage duration,blood transfusion after surgery,postoperative drainage volume and complications).Results A total of 226 patients were identified.LOS ranged from 6 days to 34 days,with a median of 15 days.60(26.5%) patients were defined as the extended LOS group.Multivariate stepwise regression identified age(P=0.010),estimated blood loss(EBL)(P<0.001),and the methods of decompression(P<0.001) as significant predictors of extended LOS.Conclusion Age,estimated blood loss and the way of decompression in the surgery are the identified variables associating with LOS.Therefore,controlling blood loss during surgery and electing appropriate techniques of posterior decompression may be beneficial to shorten the length of hospital stay after surgery.
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