Serum albumin levels predict which patients are at increased risk for complications following surgical management of acute osteoporotic vertebral compression fractures

Abstract

BACKGROUNDOsteoporotic vertebral compression fractures (OVCF) account for a substantial portion of the US healthcare financial burden. With a growing elderly population, the number of fractures contributing to sagittal imbalance is expected to increase. For those patients undergoing surgery, preoperative markers, such as albumin, may help to predict the occurrence of postoperative complications. PURPOSETo evaluate the association between preoperative serum albumin levels and the incidence of postoperative complications, mortality, and 30-day readmissions following surgical intervention for OVCF. STUDY DESIGNRetrospective study. PATIENT SAMPLEPatient data were obtained from the American College of Surgeons National Surgery Quality Improvement Project (ACS-NSIP) database between the years 2007 and 2014. OUTCOME MEASURESNo outcome measures related to self-reporting, physiology, or functionality were evaluated in this study. Primary outcome measures analyzed included various postoperative complications, patient mortality, and 30-day readmission. METHODSA retrospective analysis of the American College of Surgeons National Surgery Quality Improvement Project (ACS-NSQIP) database between 2007 and 2014 was performed, identifying 1,979 patients who met inclusion criteria. Patients were subcategorized into three groups based on preoperative nutritional status as defined by albumin levels. Outcome measures for this study included minor postoperative complication(s), major postoperative complication(s), patient mortality, 30-day readmission due to any cause, 30-day readmission related to OVCF, and total length of hospital stay. Analysis of variance was used to evaluate for associations between continuous variables and preoperative albumin levels. Spearman's rank correlation coefficient, chi-square trend, and Kruskal-Wallis analyses were utilized, as appropriate, for categorical variables. A multivariate logistic regression analysis was then conducted to calculate odds ratios with corresponding p values and 95% confidence intervals. RESULTSFunctional status showed a statistically significant decline when correlated with preoperative albumin levels. Sepsis, septic shock, pulmonary embolism, reintubation, prolonged intubation, and major complications in general are statistically more likely to occur in patients with hypoalbuminemia. Among minor complications evaluated in this study, only surgical site complications failed to demonstrate a statistical correlation with nutritional status. No statistically significant associations were identified between postoperative outcomes and age, sex, or BMI. CONCLUSIONSPreoperative albumin levels were statistically correlated to the likelihood of minor complications, major complications, or mortality.