Hereditary Protein S Deficiency and Venous Thrombo-Embolism

Summary

Protein S, a vitamin K-dependent coagulation factor, is involved in the regulation of the anticoagulant activity of activated protein C.

Using an immunoradiometric assay for total protein S in plasma we identified 14 patients (7 male and 7 female) in three unrelated Dutch families as fulfilling the criteria for an isolated protein S deficiency. In 9 patients who were not receiving oral anticoagulant treatment the mean total protein S antigen concentration was 0.50 ± 0.08 U/ml (± S.D.) and the calculated free protein S concentration was 0.15 ± 0.01 U/ml (± S.D.). In the five patients who were on oral anticoagulant treatment the mean total protein S antigen was 0.23 ± 0.05 U/ml (± S.D.).

Seven of the 14 patients had a history of venous thromboembolism occurring at a mean age of 25 years and often without an apparent cause. Protein S deficiency is inherited as an autosomal dominant trait.

Keywords

Hereditary protein S deficiency - Thrombotic disease - Oral anticoagulant treatment

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