When does 1:1 resuscitation really matter? An analysis of 4,858 patients from four traumatic hemorrhage studies.
Thomas W Clements, James Williams, Jeremy Cannon et al.
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In 30 seconds
This analysis pooled four studies of bleeding trauma patients, including a multicenter randomized trial, to examine when balanced red blood cell (RBC)-to-plasma transfusion was associated with mortality differences. Patients receiving balanced resuscitation (1:1 or less) were compared with those receiving ratios above 1:1 across early RBC transfusion volumes. Mortality differences generally emerged after more than 10 RBC units in the two pre-whole-blood studies and after more than 6 units in the two studies involving whole blood. In the whole-blood multicenter study, mortality at 11–20 units was 17% versus 31% (p = 0.030).
Key findings
- In both pre-whole-blood studies, mortality differences were observed at 21–30 RBC units: 43% vs. 71% (p = 0.013) and 32% vs 61% (p = 0.017).
- In the whole-blood SWAT study, mortality at 11–20 RBC units was 17% vs. 31% (p = 0.030) for balanced versus unbalanced resuscitation.
- Absolute mortality differences tended to widen as RBC transfusion volume increased.
Why it matters
The findings suggest that the association between balanced transfusion and mortality may depend on how much blood is given, with differences appearing at lower RBC volumes in studies involving whole blood. This volume-specific pattern may help frame research and resuscitation planning for severe traumatic hemorrhage, while recognizing that the pooled analysis includes studies with different designs and settings.
What to keep in mind
This analysis combines four studies, including single-institution cohorts and a randomized trial; the reported volume-specific mortality differences do not establish a uniform causal effect across all settings.