الفهرس 
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Abstract
Antenatal administration of corticosteroids accelerate lung maturation, reduce neonatal mortality, respiratory distress syndrome, intraventricular hemorrhage, and necrotizing enterocolitis and neonatal death. Antenatal administration of betamethasone (corticosteroid) has been recommended before 34 weeks of gestation. Serious side-effects to the neonate have not been reported after treatment during the second half of pregnancy. However, reduction in fetal body movements, fetal breathing movements and heart rate variation have been reported after betamethasone administration. These changes were transient and returned to normal values within 4 days following treatment. Doppler examination is an essential tool to assess fetal well-being. Betamethasone effect on the fetal Doppler indices in normal or complicated pregnancies, by any cause, is, however, differently reported by authors. The administration of betamethasone to pregnant women could improve the blood flow in the uterine arteries, fetal MCA, and umbilical artery 24 hours after its administration. The aim of the present study was to evaluate the effect of betamethasone administration on both umbilical artery and fetal middle cerebral artery doppler velocities in pregnancies with normal fetoplacental vascular resistance. This study was conducted on 55 pregnant women in the department of obstetrics and Gynecology, Tanta university Hospitals. Patients were received two doses of betamethasone 8 mg intramusclarl, 24h apart. All patients were subjected to: full history taking, general examination, Local examination, laboratory investigation, and US scanning.