Factor V Leiden mutation and pregnancy-related venous thromboembolism: what is the exact risk? Results from a meta-analysis.

Full Abstract

The magnitude of the association of factor V Leiden mutation with pregnancy-related venous thrombosis remains unclear. Our objective was to undertake a systematic review and a metaanalysis of the literature to estimate precisely the association of factorV Leiden mutation with the risk of first, or recurrent, pregnancy-related venous thromboembolism. Studies published before October 2005 were identified by Medline((R)). Using both fixed and random effect models, odds ratios (OR) with accompanying 95% confidential intervals (CI) were calculated for the factor V Leiden mutation and the clinical end-point (Yusuf-Peto adaptation of the Mantel-Haenszel, DerSimonian and Laird method). We identified 13 studies including 7 cohorts and 6 casecontrol studies relating to factor V Leiden and pregnancy-related venous thrombosis. The results from the cohorts showed a pooled OR of 4.46 (95% CI, 1.82-10.94; 7,879 pooled women), with no evidence of statistical heterogeneity (p = 0.36), for the risk of a first venous thromboembolism during pregnancy or the postpartum period associated with the factor V Leiden mutation. Case-control studies revealed a higher risk (OR 8.6, 95% CI, 5.85-12.63; 1,433 [corrected] pooled women) with significant heterogeneity (p < 0.005). Because of insufficient data, an analysis for the risk of recurrence could not be performed. Our findings emphasize the fact that limited data are available on this topic. This meta-analysis provides clinicians with an estimate of the average risk of a first thrombosis occurring during pregnancy in women carrying the factor V Leiden to assist the management of such women.

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Author information

Author/s: Biron-Andreani, Christine (C); Schved, Jean-Francois (JF); Daures, Jean-Pierre (JP);

Affiliation: Hopital Saint-Eloi, Laboratoire d' Hematologie, Montpellier, France. c-biron(-atsign-)chu-montpellier.fr

Journal and publication information

Publication Type: Journal Article; Meta-Analysis

Journal: Thrombosis and haemostasis (Thromb Haemost), published in Germany. (Language: eng)

Reference: 2006-Jul; vol 96 (issue 1) : pp 14-8

Dates: Created 2006/06/29; Completed 2006/10/30; Revised 2006/10/31;

PMID: 16807645, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

Comments and Corrections

ErratumIn: Thromb Haemost. 2006 Sep;96(3):389.

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