Heightened thrombin generation in individuals with resistance to activated protein C

Ida Martinelli, Bianca Bottasso, Francesca Duca, Elena Faioni, Pier Mannuccio Mannucci

Research output: Contribution to journalArticle

Abstract

We chose to evaluate whether or not a state of biochemical hypercoagulability was present in 74 individuals (69 heterozygotes and 5 homozygotes) resistant to activated protein C (APC) due to the Arg506 → Gln mutation in the factor V gene. To this end, plasma levels of two markers of thrombin formation, prothrombin fragment 1 + 2 (F1 + 2) and thrombin-antithrombin complexes (TAT), were measured. High levels of F1 + 2 and TAT were found in 32% and 23% of APC-resistant individuals vs 4% in controls. The levels of these markers tended to be particularly elevated in three homozygous subjects. A significant positive correlation between F1 + 2 and TAT was present in APC-resistant individuals. No relationship between marker values and the previous occurrence of thrombotic episodes was found. Therefore, by measuring F1 + 2 and TAT a state of biochemical hypercoagulability has been identified in about one-third of APC-resistant individuals. This frequency is similar to that previously observed in comparable individuals with inherited deficiencies of protein C and protein S, which are usually associated with a stronger thrombotic tendency than APC-resistant individuals.

Original languageEnglish
Pages (from-to)703-705
Number of pages3
JournalThrombosis and Haemostasis
Volume75
Issue number5
Publication statusPublished - May 1996

ASJC Scopus subject areas

  • Hematology

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