Alterations in platelet behavior after major trauma: adaptive or maladaptive?

Area of Science:

• Hematology
• Trauma Pathophysiology
• Immunology

Background:

• Platelets act as critical sentinels in the vascular system, initiating responses to tissue injury.
• Severe trauma and hemorrhage significantly alter platelet behavior, affecting both coagulation and inflammation.
• Altered platelet function post-trauma is linked to coagulopathy, mortality, and thrombotic events.

Purpose of the Study:

• To review current understanding of platelet biology alterations following severe trauma.
• To explore the mechanisms underlying these adaptive and maladaptive platelet changes.
• To discuss potential platelet-targeted therapies and identify research gaps.

Main Methods:

• This is a review article, synthesizing existing research on platelet function in trauma.
• The review examines studies on platelet ex vivo agonist responsiveness, inflammatory roles, and clinical outcomes.
• Mechanisms of platelet alteration and therapeutic implications are discussed based on current literature.

Main Results:

• Platelets exhibit impaired ex vivo agonist responsiveness in the acute phase post-trauma, independent of count, correlating with coagulopathy and mortality.
• In survivors, platelets become hyper-responsive, increasing the risk of thrombotic events.
• Platelets contribute to sterile inflammatory responses, influencing leukocyte behavior and potentially leading to secondary organ injury.

Conclusions:

• Severe trauma induces complex, biphasic alterations in platelet function with both procoagulant and proinflammatory consequences.
• These platelet dysfunctions have significant implications for secondary organ injury and multiple-organ dysfunction syndromes.
• Further research is needed to address knowledge gaps and develop effective platelet-focused therapies for trauma patients.