Platelet dysfunction persists after trauma despite balanced blood product resuscitation

Area of Science:

• Trauma Hemorrhage
• Coagulopathy
• Platelet Physiology

Background:

• Platelet activation and aggregation are crucial for hemostasis following trauma-induced hemorrhage.
• Platelet dysfunction is a significant factor in trauma-induced coagulopathy.
• Understanding the timing and severity of platelet dysfunction is vital for patient outcomes.

Purpose of the Study:

• To evaluate the timing and severity of platelet dysfunction in massively transfused trauma patients within 72 hours of injury.
• To determine the association between platelet dysfunction and 30-day survival.

Main Methods:

• Retrospective analysis of platelet count and function from the Pragmatic Randomized Optimal Platelet and Plasma Ratios trial.
• Measurement of platelet characteristics at 8 timepoints within 72 hours post-hospital admission.
• Assessment of platelet count via flow cytometry and function using thrombelastography and impedance aggregometry with multiple agonists.

Main Results:

• Nonsurvivors exhibited significantly lower platelet counts and aggregation compared to survivors at all measured timepoints.
• The nadir of platelet aggregation occurred 2-6 hours post-admission.
• Significant improvements in clot formation and aggregation were observed by 12 hours, independent of platelet count.

Conclusions:

• Platelet aggregability recovers approximately 12 hours post-injury, irrespective of decreasing platelet counts.
• Failure of platelet function to recover is associated with a poor prognosis in trauma patients.