Blood Gas Analysis of Placental and Uterine Blood During Cesarean Delivery
| Autor: | Joji Yoshida, Toshio Fujikura |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Gynecology
medicine.medical_specialty Fetus business.industry Placenta Uterus Obstetrics and Gynecology Physiology Intervillous space Venous blood Fetal Blood Veins medicine.anatomical_structure Pregnancy medicine Humans Gestation Female Blood Gas Analysis Vein business reproductive and urinary physiology Artery |
| Zdroj: | Obstetrics & Gynecology. 87:133-136 |
| ISSN: | 0029-7844 |
| DOI: | 10.1016/0029-7844(95)00300-2 |
| Popis: | Objective To measure blood gases in uterine venous blood and maternal and fetal blood from the placenta, and to characterize gas exchange in the intervillous space. Methods Blood gas measurements were performed immediately after collecting placental and uterine blood from the subchorial and marginal lakes, from the chorionic vein and artery in the placenta in utero, and from the uterine vein during 12 cesarean deliveries. Results The mean oxygen pressure (PO 2 ) values of the chorionic vein and subchorial lake were 28.7 ± 6.0 and 29.9 ± 7.5 mmHg, respectively, with a difference of 1.2 mmHg. The individual data for PO 2 of the chorionic vein exceeded those of the subchorial lake in five subjects and were almost equal in two of the 12 subjects. The mean values of carbon dioxide pressure (PCO 2 ) and bicarbonate were greater in the chorionic vein than in the subchorial lake, but the mean pH values were the same in the two groups. The mean values of blood gas analysis were not different between subchorial and marginal lakes with similar blood composition. The mean PO 2 of the uterine vein in ten subjects was 45.9 mmHg, significantly higher than that of the subchorial lake. Conclusions The human placenta may be defined as a multivillous model with a high degree of oxygen transfer. Arteriovenous anastomoses are suspected in the pregnant uterus beyond 37 weeks' gestation. Subchorial and marginal lakes contain similar admixed blood, which circulates and performs gas exchange. |
| Databáze: | OpenAIRE |
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