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It's About Time: Transfusion effects on postinjury platelet aggregation over time
Lucy Z Kornblith1, Anna Decker, Amanda S Conroy
1From the Department of Surgery (L.Z.K., A.D., A.S.C., A.T.F., A.J.R., R.A.C.), Zuckerberg San Francisco General Hospital; Department of Surgery, (L.Z.K., A.D., A.S.C., A.T.F., A.J.R., R.A.C., C.M.H.), the University of California, San Francisco Department of Medicine (C.M.H.), San Francisco General Hospital, San Francisco, California; and Department of Surgery (M.J.C.), Denver Health Medical Center and the University of Colorado; Denver, Colorado.
Platelet transfusions show increasing benefits for platelet aggregation over time after injury. The greatest effect is observed 4-5 days post-injury, suggesting tailored resuscitation strategies are crucial.
Area of Science:
- Trauma and Emergency Medicine
- Hematology
- Critical Care
Background:
- Impaired platelet aggregation is common after injury, but its response to transfusion is not well understood.
- Existing data suggest platelet transfusions may not always correct post-injury platelet dysfunction.
- The predictive value of impaired platelet aggregation for transfusion needs remains unclear.
Purpose of the Study:
- To investigate the impact of transfusions on post-injury platelet aggregation over time.
- To determine if the timing of transfusion influences its effectiveness.
- To identify potential periods of resistance or enhanced response to platelet transfusions.
Main Methods:
- Serial blood samples collected from 248 severely injured trauma patients over 96 hours.
- In vitro platelet aggregation assessed using aggregometry with ADP, collagen, and TRAP-6.
- Regression analysis modeled transfusion effects on platelet aggregation, adjusting for confounders and time intervals.
Main Results:
- Platelet transfusions demonstrated progressively increasing effects on subsequent platelet aggregation over time.
- The maximal expected benefit of platelet transfusion on aggregation occurred late, 4-5 days post-injury.
- Severely injured patients (ISS 21±19) showed normal baseline platelet counts, with 62% receiving transfusions within 24 hours.
Conclusions:
- Transfusion effects on post-injury platelet aggregation are time-dependent, with maximal impact seen with late transfusions.
- A potential early period of resistance to platelet transfusion may resolve by 96 hours post-injury.
- Findings support tailored resuscitation strategies based on the timing of transfusion after severe injury.