Definition
By Mayo Clinic staffAntiphospholipid syndrome is a disorder in which your immune system mistakenly produces antibodies against certain normal proteins in your blood. Antiphospholipid syndrome can cause blood clots to form within your arteries or veins as well as pregnancy complications, such as miscarriages and stillbirths.
Antiphospholipid syndrome may lead to the formation of blood clots in your legs, a condition known as deep vein thrombosis (DVT). Antiphospholipid syndrome may also cause blood clots to form in organs, such as your kidneys or lungs. Damage depends on the extent and location of the clot. For instance, a clot in your brain can cause stroke.
There's no cure for antiphospholipid syndrome, but medications can be effective in reducing your risk of blood clots.
- Donadini MP, et al. Antiphospholipid syndrome: A challenging hypercoagulable state with systemic manifestations. Hematology/Oncology Clinics of North America. 2010;24:669.
- Erkan D, et al. Antiphospholipid syndrome. In: Firestein GS, et al. Kelley's Textbook of Rheumatology. 8th ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/das/book/body/208746819-6/0/1807/0.html. Accessed Feb. 22, 2011.
- Bermas BL, et al. Pathogenesis of the antiphospholipid syndrome. http://www.uptodate.com/home/index.html. Accessed Feb. 22, 2011.
- Bermas BL, et al. Treatment of the antiphospholipid syndrome. http://www.uptodate.com/home/index.html. Accessed Feb. 22, 2011.
- Blood thinner pills: Your guide to using them safely. U.S. Department of Health and Human Services: Agency for Healthcare Research and Quality. http://www.ahrq.gov/consumer/btpills.htm. Accessed Feb. 22, 2011.
- Long BR, et al. The role of antiphospholipid syndrome in cardiovascular disease. Hematology/Oncology Clinics of North America. 2008;22:79.
- Bermas BL, et al. Clinical manifestations of the antiphospholipid syndrome. http://www.uptodate.com/home/index.html. Accessed Feb. 22, 2011.
- Antiphospholipid syndrome information page. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/antiphosphlipid/antiphospholipid.htm. Accessed Feb. 22, 2011.
- Vitamin K. The National Academies Press. http://books.nap.edu/openbook.php?record_id=10026&page=162. Accessed Feb. 28, 2011.
- Pruthi RK (expert opinion). Mayo Clinic, Rochester, Minn. Feb. 27, 2011.
- Giannakopoulos B, et al. How we diagnose the antiphospholipid syndrome. Blood. 2009;113:985.


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