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Abstract
Between 10 and 15% of clinically-recognized pregnancies abort spontaneously, usually
during the first trimester. Thus, miscarriage is the most common complication of pregnancy.
Recurrent spontaneous abortion (RSA), defined as the loss of three or more consecutive
pregnancies, affects approximately 2% of women of childbearing age. In most cases,
RSA is associated with random occurrence of chromosomally abnormal conceptions. Parental
structural chromosomal rearrangements, congenital and acquired anatomic faults, endocrine
disorders and silent infection of the genital tract each make a contribution to the
etiology of RSA. In approximately one-half of the patients a putative cause can be
identified, but whether it really is a cause of RSA often remains elusive. Although
little is known about the exact mechanisms involved in the maternal-fetal immunological
interaction, recent evidence indicates that in the pathogenesis of RSA, decidual natural
killer cells play a vital role. One of the most promising areas for future research
is, therefore, to elucidate the complex immunological mechanisms underlying pregnancy
failure.
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© 1999 Published by Elsevier Inc.