Venous thrombosis in users of non-oral hormonal contraception: follow-up study, Denmark 2001-10.

BMJ : British Medical Journal
O LidegaardEllen Løkkegaard

Abstract

To assess the risk of venous thrombosis in current users of non-oral hormonal contraception. Historical national registry based cohort study. Four national registries in Denmark. All Danish non-pregnant women aged 15-49 (n=1,626,158), free of previous thrombotic disease or cancer, were followed from 2001 to 2010. Incidence rate of venous thrombosis in users of transdermal, vaginal, intrauterine, or subcutaneous hormonal contraception, relative risk of venous thrombosis compared with non-users, and rate ratios of venous thrombosis in current users of non-oral products compared with the standard reference oral contraceptive with levonorgestrel and 30-40 µg oestrogen. Diagnoses were confirmed by at least four weeks of anticoagulation therapy after the diagnosis. Within 9,429,128 woman years of observation, 5287 first ever venous thrombosis events were recorded, of which 3434 were confirmed. In non-users of hormonal contraception the incidence rate of confirmed events was 2.1 per 10,000 woman years. Compared with non-users of hormonal contraception, and after adjustment for age, calendar year, and education, the relative risk of confirmed venous thrombosis in users of transdermal combined contraceptive patches was 7.9 (95% confiden...Continue Reading

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Methods Mentioned

BETA
contraception
bilateral oophorectomy

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