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Valproic acid modulates platelet and coagulation function ex vivo.

Ted Bambakidis1, Simone E Dekker, Ihab Halaweish

  • 1aDepartment of Surgery, University of Michigan Hospital, Ann Arbor, Michigan bDepartment of Neurological Surgery, Case Western Reserve University, Cleveland, Ohio, USA cDepartment of Surgical Gastroenterology dInstitute for Inflammation Research, Copenhagen University Hospital, Rigshospitalet, Denmark.

Blood Coagulation & Fibrinolysis : an International Journal in Haemostasis and Thrombosis
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PubMed
Summary
This summary is machine-generated.

Valproic acid (VPA) does not affect normal blood coagulation. However, VPA selectively reduces platelet activation and enhances clot strength in blood from trauma and shock patients.

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Area of Science:

  • Biomedical Sciences
  • Pharmacology
  • Trauma Research

Background:

  • Trauma-induced coagulopathy complicates patient outcomes.
  • Histone deacetylase inhibitors, like valproic acid (VPA), show promise in improving survival post-injury in animal models.
  • The direct effect of VPA on coagulopathy versus a general pro-survival effect remains unclear.

Purpose of the Study:

  • To investigate the ex vivo effects of VPA on coagulation and platelet function in swine subjected to traumatic brain injury and hemorrhagic shock.
  • To determine if VPA directly impacts platelet aggregation and clot dynamics.

Main Methods:

  • Swine blood samples were collected before and after traumatic brain injury (TBI) and hemorrhagic shock (HS).
  • Samples were incubated with VPA or a vehicle control ex vivo.
  • Platelet aggregation was assessed using impedance aggregometry.
  • Coagulation parameters were measured using thromboelastography.

Main Results:

  • VPA had no significant effect on platelet aggregation or coagulation in healthy blood samples.
  • In blood from shocked animals, VPA significantly reduced platelet aggregation induced by collagen, arachidonic acid, and adenosine diphosphate.
  • VPA significantly increased clot strength and the rate of clot formation in shock blood.

Conclusions:

  • VPA demonstrates a selective effect, not impacting normal blood but improving coagulation in a shock state.
  • VPA reduces platelet hyperactivation and enhances clot integrity, suggesting a potential therapeutic role in trauma-induced coagulopathy.