[Uteroplacental circulation and functional status of the fetoplacental unit in risk pregnancies with special reference to late gestosis].

Trial to define position and variability of radioisotope functional diagnostics of placental perfusion in comparison with urinary estrogen excretion by serial examinations. - In case of placental insufficiency estrogen values are significantly reduced starting from the 32nd to 35th gestational week as compared with normal values. In general, placenta perfusion shows delayed half-life periods of the increase in activity in all risk pregnancies beginning from the 28th week of pregnancy. A direct correlation between estrogen values and placenta perfusion can only be detected in cases of chronic placental insufficiency with intrauterine growth retardation. A prolonged perfusion time reveals a fetal hypotrophy in 53% of the cases. Late gestosis takes the first place about all risk pregnancies, connected with placental insufficiency in 30% of the cases. The tendency towards a development of placental insufficiency can be early detected by determination of placental perfusion time.