• Yuki Itagaki, Mineji Hayakawa, Yuki Takahashi, and Kazuma Yamakawa.
• Emergency and Critical Care Centre, Sapporo City General Hospital.
• Medicine (Baltimore). 2021 Mar 12; 100 (10): e25099e25099.

IntroductionThe occurrence of massive hemorrhages in various emergency situations increases the need for blood transfusions and the risk of mortality. Use of fibrinogen concentrate (FC) may increase plasma fibrinogen levels more rapidly than the use of fresh-frozen product or cryoprecipitate. However, thus far, the efficacy of FC in significantly improving the risk of mortality and significantly reducing transfusion requirements has not been effectively demonstrated in several systematic reviews and meta-analyses.Methods And AnalysisWe will conduct a systematic review and meta-analysis of FC for hemorrhages in emergency situations. We will include controlled trials, but will exclude randomized controlled trials in elective surgeries. We will include patients with hemorrhages in emergency situations. Intervention will be emergency supplementation of FC. The control group will be administered with ordinal transfusion or placebo. The primary outcome of the study is in-hospital mortality.We will search in electronic databases such as MEDLINE (PubMed), Web of Science, and the Cochrane Central Register of Controlled Trials. Two reviewers will independently screen the title and abstract, retrieve the full text of the selected articles, and extract the essential data. We will apply uniform criteria for evaluating the risk of bias associated with individual randomized controlled trial based on the Cochrane risk of bias tool. Values of the risk ratio will be expressed as a point estimate with 95% confidence intervals (CIs). Data of continuous variables will be expressed as the mean difference along with their 95% CIs and P values. We will assess the strength of evidence using the Grading of Recommendations Assessment, Development and Evaluation approach.Ethics And DisseminationThis systematic review will provide physicians with updated information on the efficacy and safety of using FC for hemorrhage in emergency settings. Approval from the ethics board and patient consent were not required in our study.This study protocol has been funded through a protocol registry. The registry number is UMIN000041598.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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