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High risk of pregnancy‐related venous thromboembolism in women with multiple thrombophilic defects
Author(s) -
Folkeringa Nienke,
Brouwer Jan Leendert P.,
Korteweg Fleurisca J.,
Veeger Nic J.G.M.,
Erwich Jan Jaap H.M.,
Van Der Meer Jan
Publication year - 2007
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.2007.06624.x
Subject(s) - medicine , pregnancy , obstetrics , factor v leiden , relative risk , protein s , thrombophilia , risk factor , odds ratio , protein s deficiency , gynecology , cohort study , confidence interval , protein c , venous thrombosis , thrombosis , genetics , biology
Summary Pregnancy is associated with an increased risk of venous thromboembolism, which probably varies according to the presence of single or multiple thrombophilic defects. This retrospective family cohort study assessed the risk of venous thromboembolism during pregnancy and puerperium, and the contribution of concomitant thrombophilic defects in families with hereditary antithrombin, protein C or protein S deficiencies. Probands were excluded. Of 222 female relatives, 101 were deficient and 121 non‐deficient. Annual incidences of venous thromboembolism were 1·76% in deficient women versus 0·19% in non‐deficient women [adjusted relative risk (RR) 11·9; 95% confidence interval (CI), 3·9–36·2]. Other single and multiple thrombophilic defects increased the risk in deficient women from 1·55% to 2·14% and 2·92%, and in non‐deficient women from 0·16% to 0·09% and 0·54% respectively. Deficient women were at lower risk (1·37%; 0·80–2·19) than deficient women that had never been pregnant (2·96%; 1·53–5·18); RR 0·5 (0·2–0·99). This difference was due to the predominance of events related to oral contraceptives in deficient women that had never been pregnant (75%), while 71% of events in deficient women that had had at least one pregnancy were pregnancy‐related. In conclusion, women with hereditary deficiencies of antithrombin, protein C or protein S are at high risk of pregnancy‐related venous thromboembolism. This risk is increased by multiple additional thrombophilic defects.