Platelet activation is increased in peripheral arterial disease

Area of Science:

• Cardiovascular Biology
• Hematology
• Vascular Medicine

Background:

• Peripheral arterial disease (PAD) is a significant risk factor for cardiovascular events.
• Platelet activation plays a crucial role in the pathophysiology of thrombosis and atherosclerosis.
• Understanding platelet behavior in PAD is essential for developing targeted therapeutic strategies.

Purpose of the Study:

• To compare platelet activation markers in patients with PAD (intermittent claudication and critical limb ischemia) against healthy controls.
• To investigate P-selectin expression and fibrinogen binding on platelets in different PAD severity groups.
• To assess the responsiveness of platelets from PAD patients to in vitro stimulation.

Main Methods:

• Prospective comparative study involving 100 subjects: 40 with intermittent claudication, 20 with critical ischemia, and 40 healthy controls.
• Whole blood flow cytometry was used to measure resting and stimulated platelet P-selectin expression and fibrinogen binding.
• Results were quantified by platelet percentage and mean fluorescence intensity.

Main Results:

• Significantly increased P-selectin expression was observed in patients with intermittent claudication and critical ischemia compared to controls.
• Platelets from patients with intermittent claudication showed significantly higher fibrinogen binding than controls.
• Platelets from patients with critical limb ischemia exhibited diminished fibrinogen binding upon stimulation compared to controls.

Conclusions:

• Increased platelet activation is evident in PAD, suggesting an underlying prothrombotic state.
• Platelets in critical limb ischemia demonstrate reduced responsiveness to in vitro stimulation.
• These findings highlight distinct platelet behavior patterns across PAD severity, impacting thrombotic risk.