Incidence of venous thromboembolism in first-degree relatives of patients with venous thromboembolism who have factor V Leiden

Francis Couturaud; Clive Kearon; Christophe Leroyer; Bernard Mercier; Jean Francois Abgrall; Grégoire Le Gal; Karine Lacut; Emmanuel Oger; Luc Bressollette; Claude Ferec; Michel Lamure; Dominique Mottier; for the Groupe d’Etude de la Thrombose de Bretagne Occidentale (G.E.T.B.O)

doi:10.1160/TH06-06-0328

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2006; 96(06): 744-749
DOI: 10.1160/TH06-06-0328

Blood Coagulation, Fibrinolysis and Cellular Haemostasis

Schattauer GmbH

Incidence of venous thromboembolism in first-degree relatives of patients with venous thromboembolism who have factor V Leiden

Francis Couturaud

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Clive Kearon

⁴McMaster University and the Henderson Research Centre, Hamilton, Ontario, Canada

,

Christophe Leroyer

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Bernard Mercier

²Transfusion Centre, Brest, France

,

Jean Francois Abgrall

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Grégoire Le Gal

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Karine Lacut

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Emmanuel Oger

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Luc Bressollette

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Claude Ferec

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

Michel Lamure

³Statistical Department, Lyon, France

,

Dominique Mottier

¹G.E.T.B.O. (Groupe d’Etude de la Thrombose de Bretagne Occidentale), EA 3878, Department of Internal Medicine and Chest Diseases, Brest, France

,

for the Groupe d’Etude de la Thrombose de Bretagne Occidentale (G.E.T.B.O)

› Author Affiliations

Abstract

Summary

The factor V Leiden (FVL) mutation, a genetic abnormality with an autosomal mode of inheritance, is associated with an increased risk of venous thromboembolism (VTE). We aimed to determine the annual incidence of VTE in first-degree relatives of patients with VTE and FVL and to identify factors in patients and the relatives that influence this incidence. In this retrospective and prospective cohort study, the incidence of objectively diagnosed first episodes of VTE was assessed in 553 first-degree relatives of 161 patients with acute VTE and FVL. The annual incidence of VTE was 0.43% (95% CI, 0.3 to 0.56) with FVL and 0.17 % (95% CI, 0.07 to 0.27) without FVL (relative risk of 2.5, 95% CI, 1.3 to 4.7). A majority (70%) of episodes of VTE were provoked, and this proportion was similar with and without FVL. A larger proportion of VTE was provoked in women (83%) that in men (33%), with the difference accounted for by pregnancy and use of oral contraceptives. The proportion of pregnancies complicated by VTE was 3.9% (95% CI, 2.0–5.8) with FVL and 1.4% (95% CI, 0.04–2.7) without FVL. FVL is associated with a two-to threefold increase in VTE in first-degree relatives of patients with VTE. No subgroup of relatives was identified who require more than routine prophylaxis because of a particularly high risk of VTE.

Keywords

Familial thrombosis - venous thrombosis - factor V Leiden

Full Text

References

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