Problems in the management of patients with artificial valves during pregnancy.

During the past 15 years, 12 patients with prosthetic valves were treated during 18 pregnancies in the four Dublin maternity hospitals. These patients were on long-term anticoagulants and their pregnancies were reviewed to assess the problems associated with anticoagulation. One baby had warfarin embryopathy, six pregnancies ended in spontaneous abortions and there were two intrauterine deaths. On the basis of the findings a policy on the most appropriate anticoagulant regimen in such cases was formulated.