| Autor: |
Gill, Robert W., Trudinger, Brian J., Garrett, William J., Kossoff, George, Warren, Peter S. |
| Zdroj: |
American Journal of Obstetrics and Gynecology; March 1981, Vol. 139 Issue: 6 p720-725, 6p |
| Abstrakt: |
Umbilical venous blood flow was measured with a pulsed Doppler unit, which was used in combination with a B-mode ultrasonic imaging system to permit location of the umbilical vein and measurement of its cross-sectional area. The accuracy and limitations of the method are discussed. Forty-seven normal fetuses with gestational ages ranging from 22 weeks to term were studied on a total of 61 occasions. Flow increased with gestational age until 36 weeks, was maximal between 37 and 38 weeks, then decreased during the last 2 weeks of pregnancy. Flow per unit of fetal weight was constant during pregnancy until 36 to 37 weeks, when a reduction occurred. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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