Thrombocyte activation increases with the degree of carotid artery stenosis

Area of Science:

• Cardiovascular Medicine
• Hematology
• Cerebrovascular Disease Research

Background:

• Platelet activation and aggregation are critical in arterio-arterial embolism, particularly in severe carotid artery stenosis.
• Understanding the relationship between stenosis degree and platelet activation is crucial for assessing cerebrovascular disease risk.

Purpose of the Study:

• To investigate if the level of in vivo platelet activation correlates with the degree of carotid artery stenosis.
• To evaluate the utility of P-selectin expression and soluble P-selectin as biomarkers for carotid stenosis severity.

Main Methods:

• Whole blood flow cytometry was used to measure platelet P-selectin expression before and after thrombin stimulation.
• Serum concentrations of soluble P-selectin (sP-selectin) were quantified using ELISA.
• Study groups included patients with high-grade stenosis (>70%), low-grade stenosis (<70%), and healthy controls.

Main Results:

• Platelet activation, measured by P-selectin expression, significantly increased with the degree of carotid stenosis.
• Both platelet P-selectin expression and sP-selectin levels could differentiate patient groups in multivariate analysis.
• Platelet P-selectin expression emerged as an independent variable associated with stenosis severity.

Conclusions:

• In vivo platelet activation is elevated in patients with increasing degrees of carotid artery stenosis.
• Flow cytometry assessment of platelet activation is valuable for evaluating patients with cerebrovascular disease.
• Platelet P-selectin expression serves as a key indicator of platelet activation in relation to carotid stenosis.