MULTIPLE PREGNANCY INDUCTION AND SELECTIVE FETAL REDUCTION IN HIGH GENETIC RISK COUPLES

Couples at risk for an inherited disorder often have several pregnancy interruptions because of affected fetuses and difficulty in achieving their desired family. We evaluated the efficiency and acceptability o f selective fetal reduction after chorionic villus sampling (CVS) of m ultiple pregnancy induced by ovarian stimulation and gamete intra-Fall opian transfer (GIFT). This approach has been offered to nine patients at risk of Mendelian diseases and one patient carrier of reciprocal t ranslocation. The acceptance has been very high (90%). One patient at risk of an autosomic recessive disease opted for artificial donor inse mination, one conceived spontaneously, and one was a poor responder to ovarian stimulation. Seven patients actually underwent a single GIFT procedure with six achieving pregnancy (86%), all but two being a mult iple pregnancy (67%). Ah pregnancies concluded uneventfully at term an d newborns were alive and healthy. Prenatal diagnosis, including fetal karyotyping in all cases, was performed at 8.5-11.5 weeks of gestatio n and confirmed either on amniotic fluid aspirated at reduction or at birth. The number of fetuses was reduced to one or two because the gen etic disease was present and/or to reduce the risk of premature delive ry and improve the likelihood of successful pregnancy. The new approac h seems to be highly effective and might be considered a practical and useful alternative to preimplantation genetic diagnosis.