Oxygen measurements in endometrial and trophoblastic tissues during early pregnancy.
Placental and endometrial partial pressures of oxygen (PO2) were measured using a polarographic oxygen electrode during the first trimester of pregnancy. Between 8-10 weeks' gestation, placental PO2 levels were significantly lower (P less than .001) than endometrial levels. A significant (P less than .001) increase was observed for placental PO2 values measured at 12-13 weeks compared with those obtained at 8-10 weeks. We suggest that the increase of placental PO2 at the end of the first trimester is related to the establishment of continuous maternal blood flow in the intervillous space.
Rodesch
F
F
Department of Obstetrics and Gynecology, University Hospital Erasme, Brussels, Belgium.
Simon
P
P
Donner
C
C
Jauniaux
E
E
D004717:Endometrium / Q000378:metabolism*; D005260:Female; D006801:Humans; D010100:Oxygen / Q000378:metabolism*; D010313:Partial Pressure; D010920:Placenta / Q000378:metabolism; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014327:Trophoblasts / Q000378:metabolism*
D010100:Oxygen