Efficacy and safety of ulinastatin on cognitive dysfunction after general anesthesia in elderly patients: A protocol for systematic review and meta-analysis

BACKGROUND: With the aging of society, the incidence of diseases increases. And along with the increase of surgery rate, the number of elderly patients with postoperative cognitive dysfunction (POCD) is also increasing. POCD seriously affects the mental state and quality of life of patients and their families. Clinical studies have shown that POCD is closely related to inflammatory reaction, and Ulinastatin can inhibit the inflammatory reaction and reduce the incidence of POCD in elderly patients under general anesthesia. However. the effect of Ulinastatin on POCD in elderly patients under general anesthesia has not been systematically evaluated. OBJECTIVE: Meta analysis will be used to evaluate the efficacy and safety of Ulinastatin in elderly patients with general anesthesia POCD during perioperative period. METHODS: We will search China Science and Technology Journal Database Chinese database, China National Knowledge Infrastructure, Wanfang, China biomedical database, PubMed, EMBASE, Cochrane Library and web of science for randomized controlled trials of the effect of Ulinastatin on POCD of elderly patients with general anesthesia from the establishment of the database to November 2020. The 2 researchers will independently screen the literature and conducted quality assessment and data extraction for the included studies, Revman5.3 software will be used for risk assessment and meta analysis. RESULTS: In this study, the efficacy and safety of Ulinastatin in elderly patients with general anesthesia POCD will be evaluated by the incidence of postoperative cognitive impairment, mini mental state examination (Mini-Mental State Examination [MMSE]), visual regeneration, associative memory score, S100 β protein, tumor necrosis factor α (TNF- α), interleukin 6 (IL-6), IL- 10 inflammatory factors and the incidence of adverse reactions. CONCLUSION: The use of Ulinastatin in perioperative period can significantly reduce the inflammatory level of elderly patients after general anesthesia, effectively prevent the occurrence of POCD and reduce its incidence. ETHICS AND DISSEMINATION: The private information from individuals will not be published. This systematic review also will not involve endangering participant rights. Ethical approval is not required. The results may be published in a peer-reviewed journal or disseminated in relevant conferences. OSF REGISTRATION NUMBER: DOI 10.17605/OSF.IO/GY3V7