In 2006, we published a study that indicated that the new transdermal contraceptive patch containing ethinyl estradiol (EE) and the progestin norelgestromin did not increase the risk for venous thromboembolism (VTE) compared to oral contraceptive containing norgestimate and 35 ��g of EE.
This report updates information on the risk of nonfatal VTE in women using the contraceptive patch in comparison to women using oral contraceptives containing norgestimate (either monophasic or triphasic) and 35 ��g of EE (norgestimate-35) using an additional 17months of data.
Design, Setting and Participants
Nested case-control design based on information from PharMetrics, a US-based company that collects and organizes information on claims paid by managed care plans. The study was nested among all women, aged 15 to 44 years, who started either the contraceptive patch or norgestimate-35 after April 1, 2002. Cases were women with current use of one of these two study drugs and a documented diagnosis of VTE in the absence of identifiable clinical risk factors (idiopathic VTE) who were not in the earlier study. Up to four controls were matched to each case by age and calendar time.
Main Outcome Measures
Odds ratios (ORs) comparing the risk of nonfatal VTE in new users of the two contraceptives.
We identified 56 new cases of newly diagnosed, idiopathic VTE in the updated study population. The OR comparing the contraceptive patch to norgestimate-35 was 1.1 (95% CI 0.6���2.1).
After evaluating an additional 17 months of data, the results indicate that the risk of nonfatal VTE for the contraceptive patch is closely similar to the risk for oral contraceptives containing 35 ��g of EE and norgestimate.
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- Risk of non-fatal venous thromboembolism in women using a contraceptive transdermal patch and oral contraceptives containing norgestimate and 35 ��g of ethinyl estradiol.Contraception. 2006; 73: 223-228
- Venous thromboembolism, myocardial infarction, and stroke among transdermal contraceptive system users.Obstet Gynecol. 2007; 109: 339-346
Published online: May 11, 2007
Accepted: March 10, 2007
Received in revised form: March 7, 2007
Received: January 30, 2007
© 2007 Published by Elsevier Inc.