Seeking a Relevant Description of Major Trauma Bleeding: Comparison of Four Major Bleeding Definitions.

Background: The traditional definition of massive transfusion is 10 red blood cell units transfused within 24 hr. This definition has been faulted for excluding patients who die early from exsanguination. Alternative major bleeding definitions in the trauma literature include time-based (e.g., Resuscitation Intensity) and event based (e.g., Sharpe) transfusion thresholds.

Objective: The study objective was to compare four definitions of major bleeding, including a modification to the Sharpe definition, on clinically relevant processes and outcomes.

Methods: This is a retrospective cohort study of adult trauma patients admitted from the field to a Level I trauma center from 2014 to 2019. Data sources were the trauma registry, blood bank, and electronic medical records. Transfusion thresholds were defined as follows: Resuscitation Intensity-4 units of any combination of crystalloids, colloids, or blood products within the first 30 min of arrival; Sharpe-10 red blood cell units from trauma bay presentation to inpatient admission (a proxy for the interval of hemorrhage control); Modified Sharpe-10 units of any combination of blood products during the same interval. The study analysis consisted of descriptive statistics.

Results: The cohort contained 187 subjects. Of 39 deaths, 28 (72%) occurred within 6 hr following arrival. Modified Sharpe captured 27 (96%) of these 28 subjects, whereas Resuscitation Intensity captured 20 (71%). Sharpe and the traditional definition each captured 22 subjects (79%). Modified Sharpe captured 17%-25% of deaths missed by the other definitions.

Conclusion: Modified Sharpe may optimally indicate major bleeding during trauma resuscitation.