Thrombin generation potential is increased in patients with autoimmune inflammatory myopathies

Area of Science:

• Rheumatology
• Hematology
• Immunology

Background:

• Dermatomyositis and polymyositis (DM/PM) are rare autoimmune inflammatory myopathies.
• These conditions are associated with an elevated risk of cardiovascular and thromboembolic events.
• Prothrombotic plasma properties are suspected contributors to these risks.

Purpose of the Study:

• To evaluate the in vitro thrombin generation profile in DM/PM patients.
• To assess thrombin generation as a potential biomarker for plasma procoagulant properties in DM/PM.

Main Methods:

• Calibrated Automated Thrombinography (CAT) was used to measure plasma thrombin generation potential.
• The study included 58 clinically stable DM/PM patients and 67 matched controls.
• Analysis correlated thrombin generation with clinical disease characteristics and autoantibody profiles.

Main Results:

• DM/PM patients exhibited significantly increased endogenous thrombin potential (ETP), peak thrombin concentration, and thrombin generation rate compared to controls.
• Elevated ETP in DM was linked to higher fibrinogen, C-reactive protein, and total cholesterol.
• In PM, increased ETP correlated with arthritis and higher platelet count; a strong inverse relationship was observed with serum troponin.

Conclusions:

• DM/PM patients demonstrate enhanced thrombin generation potential, suggesting underlying prothrombotic plasma properties.
• Further research is necessary to elucidate the clinical significance and role of this finding in the disease course and outcomes of DM/PM.