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J Am Coll Cardiol, 1986; 8:221-224
© 1986 by the American College of Cardiology Foundation
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Combined use of warfarin and adjusted subcutaneous heparin during pregnancy in patients with an artificial heart valve

PK Lee, RY Wang, JS Chow, KL Cheung, VC Wong, and TK Chan

Adjusted subcutaneous heparin was used for thromboembolism prophylaxis during 18 pregnancies in 16 women with an artificial heart valve. Oral warfarin was replaced by subcutaneous heparin as soon as pregnancy was confirmed. The dosage of heparin was adjusted to maintain a partial thromboplastin time at 1.5 times the control value and treatment was administered during the first trimester and the last 3 weeks of gestation. Warfarin was used between the 13th and 37th week. There were no maternal thromboembolic complications and none of the live-born infants showed congenital malformations, indicating that this regimen is effective. However, there were nine spontaneous abortions, including five that occurred in the first 12 weeks. The early abortions were probably related to warfarin exposure at the beginning of pregnancy. The preconception replacement of warfarin by heparin in these patients may be indicated.


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Copyright © 1986 by the American College of Cardiology Foundation.