Thrombin generation profile in non-thrombotic factor V Leiden carriers

Area of Science:

• Hematology
• Genetics
• Thrombosis Research

Background:

• Factor V Leiden (FVL) mutation is a prevalent genetic risk factor for venous thromboembolism.
• FVL is found in 18% of individuals with a family history of thrombosis.
• Thrombin generation (TG) testing is a standard method for assessing thrombotic risk.

Purpose of the Study:

• To evaluate the thrombogenic potential of the FVL mutation.
• To assess FVL's impact in asymptomatic carriers and patients with personal or familial thrombosis history.
• To correlate TG parameters with different thrombosis types and family history.

Main Methods:

• Retrospective single-center study of 160 patients (43 personal history, 117 familial history of thrombosis).
• Thrombin generation assays performed on frozen platelet-poor plasma using standardized tissue factor and phospholipid concentrations.
• Analysis of endogenous thrombin potential (ETP) and thrombin peak to assess thrombotic risk.

Main Results:

• FVL mutation was associated with a global increase in thrombin generation.
• Elevated TG observed in patients with unprovoked and provoked thrombosis.
• In unprovoked thrombosis, pulmonary embolism cases showed higher ETP than deep vein thrombosis (DVT).

Conclusions:

• Measurement of thrombin generation in FVL mutation carriers may identify individuals at increased risk of unprovoked thrombosis.
• A predictive score incorporating age and ETP showed potential for risk stratification in familial history cases.
• Further research is needed to validate predictive models for asymptomatic FVL carriers.