Transient ischemic attacks due to increased platelet aggregation and adhesiveness. Ultrastructural and functional...

Area of Science:

• Neurology
• Hematology
• Vascular Medicine

Background:

• Transient ischemic attacks (TIAs) are often attributed to cerebrovascular disease, emboli, or other conditions.
• Identifying the precise cause of TIAs is crucial for effective treatment and prevention.

Purpose of the Study:

• To investigate a potential subgroup of patients experiencing TIAs due to isolated platelet function abnormalities.
• To evaluate the efficacy of antiplatelet therapy in this specific patient group.

Main Methods:

• Case series of 22 patients with TIAs lacking common etiological factors.
• Assessment of platelet adhesiveness and aggregation.
• Clinical follow-up (1-5 years) with repeated coagulation studies.
• Treatment with antiplatelet drugs and observation of response.
• Platelet morphology analysis using electron microscopy in two cases.

Main Results:

• Patients exhibited abnormally increased platelet adhesiveness and/or aggregation without evidence of atherosclerotic disease, intracranial lesions, cardiac emboli, arteritis, or migraine history.
• Antiplatelet drug therapy led to significant clinical improvement, with decreased platelet aggregation and adhesiveness.
• Discontinuation of antiplatelet medication resulted in TIA recurrence, correlating with increased platelet activity.

Conclusions:

• A distinct group of TIA patients may have TIAs solely caused by platelet function disorders.
• Antiplatelet therapy offers a specific and effective treatment for these patients.
• Monitoring platelet adhesiveness and aggregation can guide treatment efficacy.