Blood Clot Risk Elevated in Patch and Vaginal Ring Users

Risk of venous thrombosis higher in non-oral contraceptives compared to oral contraceptives

FRIDAY, May 11 (HealthDay News) -- Compared to nonusers of hormonal contraception, women who use combined contraceptive transdermal patches are at an eight-fold increased risk of venous thrombosis, and vaginal ring users are at a more than six-fold increased risk, according to a study published online May 10 in BMJ.

Øjvind Lidegaard, M.D., from the University of Copenhagen in Denmark, and colleagues analyzed data from four national registries on 1,626,158 non-pregnant Danish women, aged 15 to 49 years, who were free of previous cancer or thrombotic disease.

The researchers found that, over the nine-year study period, there were 3,434 confirmed first-ever venous thrombosis events. The incidence rate of confirmed events was 2.1 per 10,000 woman years in nonusers of hormonal contraception. After adjusting for other variables, the relative risk of confirmed venous thrombosis was 7.9 (95 percent confidence interval [CI], 3.5 to 17.7) in users of transdermal combined contraceptive patches and 6.5 (95 percent CI, 4.7 to 8.9) in users of the vaginal ring, compared to nonusers. There was also increased relative risk in women who used subcutaneous implants (1.4; 95 percent CI, 0.6 to 3.4), but not in those who used the levonorgestrel intrauterine system (0.6; 95 percent CI, 0.4 to 0.8). Compared to users of combined oral contraceptives containing levonorgestrel, the adjusted relative risk of venous thrombosis in transdermal patch and vaginal ring users was 2.3 (95 percent CI, 1.0 to 5.2) and 1.9 (95 percent CI, 1.3 to 2.7), respectively.

"Women who use transdermal patches or vaginal rings for contraception have a 7.9 and 6.5 times increased risk of confirmed venous thrombosis compared with nonusers of hormonal contraception of the same age," the authors conclude.

Several authors disclosed financial ties to the pharmaceutical industry.

Full Text

Copyright © 2012 HealthDay. All rights reserved.

Powered by

jQuery UI Accordion - Default functionality

For life-long learning and continuing professional development, come to Lippincott's NursingCenter.

Nursing Jobs Plus
Featured Jobs
Recommended CE Articles Recommended Nursing Articles

Abdominal Pain: An Approach to a Challenging Diagnosis
AACN Advanced Critical Care, July/September 2014
Free access will expire on October 13, 2014.


HIPAA Compliance Practice Tips
Professional Case Management, July/August 2014
Free access will expire on September 29, 2014.


Follow the leader: How does “followership” influence nurse burnout?
Nursing Management, August 2014
Free access will expire on September 29, 2014.


More Recommended Articles

Subscribe to Recommended Articles

Evidence Based Practice Skin Care Network NursingCenter Quick Links What’s Trending Events