To the Editor Dr Neuman and colleagues1 concluded that the use of regional anesthesia compared with general anesthesia after hip fracture surgery was not associated with lower 30-day mortality. This finding suggests that previous large observational studies have overestimated the mortality benefit of regional anesthesia.2,3 The authors attempted to overcome the potential selection bias of previous studies by using multivariable matching and instrumental variable analysis.
Dillane D, Green J. Anesthesia Technique and Outcomes After Hip Fracture Surgery. JAMA. 2014;312(17):1801-1802. doi:10.1001/jama.2014.11226