Cong 2016.

Study name	Nerve block anesthesia and general anesthesia: influence on postoperative cognitive dysfunction after hip arthroplasty of aged patients with femoral neck fracture (a randomized controlled trial)
Methods	Parallel RCT Approved by the ethics committee and informed consents obtained Site: Shanghai 10th Hospital, Shanghai, China Data collection: 1 June 2017 to 1 October 2019 Funding: departmental/institutional Registration: ChiCTR‐INR‐16009481
Participants	100 participants between 60 and 80 years of age with normal mental status and unilateral hip fracture undergoing hip arthroplasty Excluded: severe respiratory disease, preoperative cognitive dysfunction Type of fracture:  femoral neck fracture Anaesthetic technique for surgery:  to be determined Surgical technique: hip arthroplasty Mean age: (range ): to be determined Percentage female: % to be determined Length of follow‐up:  3 months
Interventions	Intervention 1: nerve block plus enhanced recovery protocol (N = 25) Intervention 2: nerve block without enhanced recovery protocol (N = 25) Comparator 1: no block plus general anaesthesia (N = 25) Comparator 2: no block and no general anaesthesia (N = 25)
Outcomes	Relevant to this review. Acute confusional state (up to 3 months after surgery). Not relevant to this review. Cognition function. Bispectral index. S100B protein. Functional recovery. Cerebral oxygen saturation. Minerals.
Starting date	First posted: 18 October 2016 Study start date: to be determined Study completion date: to be determined Last update posted: 18 April 2017
Contact information	Ruijun Cong
Notes	Conflict of interest: to be determined DOI: to be determined