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Increased platelet aggregation and activation in peripheral arterial disease

P A Robless1, D Okonko, P Lintott

  • 1Academic Surgical Unit, Imperial College School of Medicine, St Mary's Hospital, Praed St, London W2 1NY, UK.

European Journal of Vascular and Endovascular Surgery : the Official Journal of the European Society for Vascular Surgery
|January 15, 2003
PubMed

Insights

Platelet hyperactivity is common in peripheral arterial disease (PAD) and related conditions like carotid disease and abdominal aortic aneurysm (AAA), even with antiplatelet therapy. Further strategies are needed to protect these high-risk patients.

Area of Science:

  • Cardiovascular Medicine
  • Hematology
  • Vascular Surgery

Background:

  • Peripheral arterial disease (PAD) significantly increases cardiovascular mortality.
  • Standard antiplatelet therapies may not provide consistent benefits across all patient subgroups.
  • Understanding platelet function variations is crucial for optimizing treatment.

Purpose of the Study:

  • To compare platelet function in patients with lower limb PAD, carotid disease, and abdominal aortic aneurysm (AAA).
  • To assess platelet activation and aggregation markers in these patient groups against healthy controls.
  • To investigate the impact of different vascular conditions on platelet behavior.

Main Methods:

  • Studied patients with lower limb PAD (n=20), carotid disease (n=40), AAA (n=13), and healthy controls (n=20).
  • Utilized whole blood methods to measure spontaneous platelet aggregation (SPA) and adenosine diphosphate (ADP)/collagen-induced aggregation.
  • Employed flow cytometry to detect platelet P-selectin and PAC-1 antigen as markers of activation and aggregation.

Main Results:

  • Patients with lower limb PAD or AAA showed higher baseline SPA than controls (p < 0.01).
  • Carotid artery disease patients exhibited significantly higher collagen-induced aggregation (p < 0.01) and P-selectin expression (p < 0.05) versus controls.
  • No significant differences in ADP-induced aggregation or PAC-1 binding were observed between PAD patients and controls.

Conclusions:

  • Platelet hyperactivity persists in PAD patients despite antiplatelet therapy, indicating a need for enhanced treatment strategies.
  • Findings suggest that specific vascular conditions like PAD, carotid disease, and AAA are associated with distinct patterns of platelet activation.
  • Further research into novel antiplatelet strategies is warranted to improve outcomes for these high-risk cardiovascular patients.
Abstract

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