An abnormal systemic and regional hypercoagulable state in patients with mitral stenosis

Area of Science:

• Cardiology
• Hematology
• Thrombosis Research

Background:

• Mitral stenosis is a significant health issue in Southeast Asia, linked to thromboembolism and left atrial thrombus formation.
• The exact mechanisms leading to left atrial thrombus in mitral stenosis patients are not fully understood.

Purpose of the Study:

• To investigate coagulation and platelet activity in the left atrium and peripheral circulation of mitral stenosis patients.
• To compare hematologic markers in patients with mitral stenosis versus a control group.

Main Methods:

• Blood samples analyzed for markers of coagulation and platelet activation (F1+2, TAT, beta-TG, thrombomodulin, PAI-1).
• Samples collected from left atrium, femoral artery/vein, and pulmonary artery in patients; antecubital vein in controls.
• Study included 36 patients with moderate to severe mitral stenosis, some with atrial fibrillation.

Main Results:

• Left atrial levels of F1+2, TAT, and beta-TG were significantly higher in mitral stenosis patients compared to peripheral circulation.
• Thrombomodulin levels were significantly lower in the left atrium of patients versus peripheral circulation.
• Peripheral venous blood showed higher TAT and PAI-1, and lower thrombomodulin in mitral stenosis patients compared to controls.

Conclusions:

• Mitral stenosis patients exhibit a hypercoagulable state in the left atrium and systemic circulation.
• Abnormalities in coagulation, platelets, and endocardial function contribute to left atrial thrombus formation.
• Findings suggest a potential mechanism for thromboembolism in mitral stenosis patients.