Uterine artery blood flow response to correction of amniotic fluid volume
Article Abstract:
Changes in amniotic fluid volume may affect blood flow through the uterine artery. Too much amniotic fluid may increase intrauterine pressure, which could potentially impair blood flow within the placenta. Color Doppler ultrasound studies were done of blood flow within the uterine arteries of three groups of women. Group 1 consisted of eight women pregnant with twins who were having excess fluid withdrawn from one twin's amniotic sac. Group 2 consisted of seven women with low levels of amniotic fluid who received saline infusions through the uterine wall. Group 3, the control group, comprised six women having needles passed through the abdominal wall for other procedures. Four of the eight women having amniotic fluid withdrawn had measurements indicating impaired blood flow. Only one had abnormal values after removal of excess fluid. However, resistance to blood flow increased among group 2 women after adding saline. No changes were seen in the control group.
Publication Name: American Journal of Obstetrics and Gynecology
Subject: Health
ISSN: 0002-9378
Year: 1995
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Hydrostatic and osmotic pressure gradients produce manifestations of fetofetal transfusion syndrome in a computerized model of monochorial twin pregnancy
Article Abstract:
The exchange of fluids from one twin fetus to another in fetofetal transfusion syndrome may be more severe when the predominant flow is in one direction. Researchers designed a computer model of fluid flow in a pregnancy complicated by fetofetal transfusion syndrome. When the direction of flow goes mostly from one twin to the other, both twins may be harmed. The donor twin loses fluid to the point that urine output may stop, and fluid pressure in the recipient twin may be too high. The donor twin may experience anemia, while the recipient twin may have too many red blood cells. Twin pregnancies with fluid flow going both directions may result in normal fluid pressure for both twins. In this situation, doctors may not be able to diagnose a twin transfusion syndrome. There is evidence that the syndrome may resolve on its own.
Publication Name: American Journal of Obstetrics and Gynecology
Subject: Health
ISSN: 0002-9378
Year: 1996
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