Viscoelastic haemostatic assays in the perioperative period of surgical procedures: Systematic review and meta-analysis.

Objective: The aim of this study is to evaluate the safety and efficacy of Viscoelastic Haemostatic Assays (VHA) to guide transfusions in patients undergoing surgical procedures.

Design: Systematic review with meta-analysis of randomized controlled trials up until June 5, 2019.

Setting: Hospitalized patients.