Thromb Haemost 1995; 74(04): 1103-1106
DOI: 10.1055/s-0038-1649888
Original Article
Coagulation
Schattauer GmbH Stuttgart

Factor VIIa in Patients with C1-Inhibitor Deficiency

Erik Waage Nielsen
1   The Department of Anaesthesiology, Nordland Central Hospital, Bodø and University of Tromsø, Norway
,
James Morrissey
2   The Oklahoma Medical Research Foundation, Oklahoma City, USA
,
Jan Ole Olsen
3   The Institute of medical Biology, University of Tromsø, Norway
,
Bjarne Østerud
3   The Institute of medical Biology, University of Tromsø, Norway
› Author Affiliations
Further Information

Publication History

Received 08 February 1995

Accepted after resubmission 23 June 1995

Publication Date:
09 July 2018 (online)

Summary

In hereditary angioedema (HAE), normal C1-inhibitor (CI-INH) is low and the contact system aetivated. Recently, the findings of a tissue factor mutant selectively deficient in promoting the conversion of FVII to FVIIa, but with retained cofactor for FVIIa, made it possible to examine reliably the pre-existing content of FVIIa in HAH patients. This was of interest as FXIIa (mainly inhibited by (CI-INH) is able to activate FVII directly. FVIIa in 21 remission HAH patients were within normal limits but nearly doubled as compared to their 23 normal siblings (p = 0.0017). Cold promoted activation of FVII (CPA) (common Clot assay) was displayed in plasma of all 5 untreated patients (CI-INH function <35%), but not in plasma of 2 patients treated prophylactically with danazol (CI-INH function about 40%). These results suggest that there is a minute, yet significant activation of FVII in patients with CI-INH deficiency.

 
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