0.05). Significantly less amount of hemorrhage was found in women who delivered after 2 hours of massive hemorrhage than those within 2 hours (P

Objective To observe the effects of renin - angiotensin system ( RAS ) and steroid hormones onpregnancy in in vitro fertilization and embryo transfer(IVF-ET). Methods .53 tubal infertility women underwent IV F-ET under control of ovarian hyperstimulation with GnRHa/FSH/hMG/hCG. Plasma total renin, serum estradiol(E2),progesterone(P) and testosterone(T) were measured on the day of injection of injection of hCG and 36h after hCG( before getting the oocytes). ResultsPlasma total renin level on the day of hCG in pregnant group was higher than that in nonpregnant group(P<0.05), E2 and P lower than that in nonpregnant group(P<0.05, P<0.01). Plasma total renin and E2 levels 36h after hCG in pregnant group were lower than that in nonpregnant group( P<0.05). There was no difference in other hormones between the two groups. ConclusionThe high concentration of total renin on the day of hCG injection and its low concentration 36h after hCG administration are probably conducive to pregnancy.