Background: There is sparse evidence on the benefit of neuraxial (NA) vs general anesthesia (GA) as the primary anesthetic in postoperative outcomes following bilateral total knee arthroplasty. We sought to elucidate differences in outcomes in this surgical population using a national database.
Methods: We used data from the National Surgical Quality Improvement Program from 2007 to 2013 and compared rates of various postoperative outcomes in propensity-matched cohorts (NA vs GA).
Results: After exclusion, there were 1957 patients included in the final analysis, of which 26% received NA as the primary anesthetic. Propensity-matched cohorts were generated to ensure no differences in various comorbidities (including bleeding disorders or inadequate cessation of anticoagulation therapy), case duration, and patient demographics between both cohorts. Among the matched cohorts, there were no differences in preoperative platelet count, hematocrit, or international normalized ratio. NA was associated with decreased blood transfusion requirement and decreased total number of units of blood products transfused (P < .0001 for both outcomes). However, there were no differences in other outcomes, including hospital length of stay, pulmonary embolism, deep vein thrombosis, or urinary tract infections.
Conclusion: Our study demonstrates that in matched cohorts, NA is associated with decreased blood transfusion requirements in patients undergoing bilateral total knee arthroplasty when compared to GA as the primary anesthetic.
Keywords: arthroplasty; knee; neuraxial; outcome; transfusion.
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