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Local hemostasis in subarachnoid hemorrhage.
European Neurology
|January 1, 1987
Summary
Platelet proteins like Fibrinopeptide A (FPA) clear quickly after subarachnoid hemorrhage. Their limited presence suggests they primarily initiate early vasospasm and neurological deficits.
Area of Science:
- Neuroscience
- Hematology
- Pharmacology
Background:
- Subarachnoid hemorrhage (SAH) carries a high risk of rebleeding and vasospasm.
- Cerebrospinal fluid (CSF) protein levels may indicate pathological processes post-SAH.
- Early detection of thrombotic activity in CSF is crucial for managing neurological deficits.
Purpose of the Study:
- To measure Fibrinopeptide A (FPA) and other platelet proteins in CSF after SAH.
- To assess the role of these proteins in the early stages of vasospasm and neurological deficits.
- To evaluate the impact of antifibrinolytic agents (tranexamic acid, aprotinin) on CSF protein levels.
Main Methods:
- CSF samples were collected from SAH patients treated with tranexamic acid or aprotinin.
- Levels of Fibrinopeptide A (FPA), platelet factor 4, and beta-thromboglobulin were quantified.
- Protein clearance from CSF was monitored over time post-SAH.
Main Results:
- Platelet-secreted proteins, including FPA, were cleared from CSF within 3 days post-SAH.
- The vasoactive and thrombotic potential of these proteins is confined to the initial phase of vasospasm (3-8 days post-bleeding).
- Elevated CSF thrombotic activity, indicated by high FPA and platelet protein levels, correlated with neurological deficits.
Conclusions:
- Fibrinopeptide A (FPA) and other platelet proteins have a transient role in the early pathophysiology of SAH.
- Their limited window of activity suggests they are involved in initiating vasospasm and neurological deficits.
- Understanding these early thrombotic markers may inform future therapeutic strategies for SAH complications.