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Platelet function suggests cardioembolic aetiology in cryptogenic stroke.

Priya Dev1, Mohammad Ekhlak2, Debabrata Dash3

  • 1Department of Neurology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India.

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Platelets in both cryptogenic and cardioembolic stroke become hyperactive, showing increased aggregation and P-selectin expression. This heightened platelet responsiveness contributes to thrombus formation in acute ischemic stroke.

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Area of Science:

  • Hematology
  • Neurology
  • Cardiology

Background:

  • Platelet-monocyte (PMA) and platelet-neutrophil aggregations (PNA) are crucial in acute ischemic stroke (AIS) development.
  • Understanding platelet behavior in different stroke subtypes is vital for targeted therapies.

Purpose of the Study:

  • To investigate the mechanistic basis of platelet responsiveness in cryptogenic stroke compared to cardioembolic stroke.
  • To compare platelet activation markers and aggregation in stroke patients versus healthy controls.

Main Methods:

  • Analysis of platelet-monocyte and platelet-neutrophil interactions.
  • Measurement of P-selectin expression on platelet surfaces.
  • Assessment of intracellular calcium ([Ca2+]i) levels.
  • Thromboelastography (TEG) to evaluate coagulation parameters.

Main Results:

  • Both cryptogenic and cardioembolic stroke groups showed significantly elevated PMA and PNA compared to controls.
  • P-selectin expression and intracellular calcium levels were significantly higher in both stroke groups.
  • TEG revealed hypercoagulability in cryptogenic stroke, with decreased reaction time and K-value, and an augmented alpha-angle, indicating enhanced thrombus formation.

Conclusions:

  • Platelets in both cryptogenic and cardioembolic stroke exhibit a 'hyperactive' phenotype.
  • Elevated platelet aggregation and activation markers are implicated in the pathophysiology of AIS.
  • These findings highlight the central role of platelet hyperreactivity in stroke.