BACKGROUND: Venous thrombosis is one of the leading causes of maternal morbidity and mortality. OBJECTIVE: In the MEGA study, we evaluated pregnancy and the postpartum period as risk factors for venous thrombosis in 285 patients and 857 control subjects. PATIENTS/ METHODS: Between March 1999 and September 2004, consecutive patients with a first episode of venous thrombosis were included from six anticoagulation clinics. Partners of patients and a random digit dialing group were included as control subjects. Participants completed a questionnaire and DNA was collected. RESULTS: The risk of venous thrombosis was 5-fold (OR, 4.6; 95% CI, 2.7-7.8) increased during pregnancy and 60-fold (OR, 60.1; 95% CI, 26.5-135.9) increased during the first 3 months after delivery compared with non-pregnant women. A 14-fold increased risk of deep venous thrombosis of the leg was found compared with a 6-fold increased risk of pulmonary embolism. The risk was highest in the third trimester of pregnancy (OR, 8.8; 95% CI, 4.5-17.3) and during the first 6 weeks after delivery (OR, 84.0; 95% CI, 31.7-222.6). The risk of pregnancy-associated venous thrombosis was 52-fold increased in factor V Leiden carriers (OR, 52.2; 95% CI, 12.4-219.5) and 31-fold increased in carriers of the prothrombin 20210A mutation (OR, 30.7; 95% CI, 4.6-203.6) compared with non-pregnant women without the mutation. CONCLUSION: We found an increased risk of venous thrombosis during pregnancy and the postpartum period, with an especially high risk during the first 6 weeks postpartum. The risk of pregnancy-associated venous thrombosis was highly increased in carriers of factor V Leiden or the prothrombin 20210A mutation.
BACKGROUND:Venous thrombosis is one of the leading causes of maternal morbidity and mortality. OBJECTIVE: In the MEGA study, we evaluated pregnancy and the postpartum period as risk factors for venous thrombosis in 285 patients and 857 control subjects. PATIENTS/ METHODS: Between March 1999 and September 2004, consecutive patients with a first episode of venous thrombosis were included from six anticoagulation clinics. Partners of patients and a random digit dialing group were included as control subjects. Participants completed a questionnaire and DNA was collected. RESULTS: The risk of venous thrombosis was 5-fold (OR, 4.6; 95% CI, 2.7-7.8) increased during pregnancy and 60-fold (OR, 60.1; 95% CI, 26.5-135.9) increased during the first 3 months after delivery compared with non-pregnant women. A 14-fold increased risk of deep venous thrombosis of the leg was found compared with a 6-fold increased risk of pulmonary embolism. The risk was highest in the third trimester of pregnancy (OR, 8.8; 95% CI, 4.5-17.3) and during the first 6 weeks after delivery (OR, 84.0; 95% CI, 31.7-222.6). The risk of pregnancy-associated venous thrombosis was 52-fold increased in factor V Leiden carriers (OR, 52.2; 95% CI, 12.4-219.5) and 31-fold increased in carriers of the prothrombin 20210A mutation (OR, 30.7; 95% CI, 4.6-203.6) compared with non-pregnant women without the mutation. CONCLUSION: We found an increased risk of venous thrombosis during pregnancy and the postpartum period, with an especially high risk during the first 6 weeks postpartum. The risk of pregnancy-associated venous thrombosis was highly increased in carriers of factor V Leiden or the prothrombin 20210A mutation.
Authors: Shannon M Bates; Ian A Greer; Saskia Middeldorp; David L Veenstra; Anne-Marie Prabulos; Per Olav Vandvik Journal: Chest Date: 2012-02 Impact factor: 9.410
Authors: Hooman Kamel; Babak B Navi; Nandita Sriram; Dominic A Hovsepian; Richard B Devereux; Mitchell S V Elkind Journal: N Engl J Med Date: 2014-02-13 Impact factor: 91.245
Authors: Shannon M Bates; Anita Rajasekhar; Saskia Middeldorp; Claire McLintock; Marc A Rodger; Andra H James; Sara R Vazquez; Ian A Greer; John J Riva; Meha Bhatt; Nicole Schwab; Danielle Barrett; Andrea LaHaye; Bram Rochwerg Journal: Blood Adv Date: 2018-11-27