Changes in left thoracic duct lymph flow during progressive anemia in the ovine fetus

Article Abstract:

The flow rate of lymphatic fluid may steadily increase in fetuses with progressive anemia without attaining a maximum flow. Researchers instrumented eight fetal sheep near the end of pregnancy to induce progressive anemia. The flow of lymph through the chest duct doubled as the level of red blood cells decreased from 34% to 14%. Large amounts of excess fluid in the fetus were prevented because lymph returned protein to the plasma circulation. Fetal blood pressure did not change or restrict increases in lymph flow. Increased lymph flow increased the filtration rate across capillaries. The transcapillary filtration increase may be caused by a decrease in the ratio of precapillary to postcapillary resistance, which may enable oxygen to continue to reach tissues.

Physiological aspects, Development and progression, Lymph nodes, Fetal diseases, Anemia in children, Pediatric anemia

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Sources of amniotic fluid erythropoietin during normoxia and hypoxia in fetal sheep

Article Abstract:

Study is presented to determine whether erythropoietin is present in ovine amniotic fluid, fetal urine, and/or lung liquid and whether concentrations in these compartments change in parallel with endogenous fetal plasma erythropoietin concentration when the latter is increased experimentally. Conclusions reveal that fetal urinary erythropoietin may contribute to the rise in plasma concentration increase in parallel during anemia.

Health aspects, Care and treatment, Pregnant women, Hypoxia, Anoxia, Erythropoietin, Disease/Disorder overview

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Regulation of amniotic fluid volume: Intramembranous solute and volume fluxes in late gestation fetal sheep

Article Abstract:

The purpose of the present study was to determine simultaneous intramembranous solute and volume fluxes to gain insight into the mechanisms that regulate intramembranous absorption and amniotic fluid (AF) volume. The present data suggest that most intramembranous absorption of AF occurs by a bulk transfer of AF with all of its dissolved solutes into fetal blood.

Science & research, Sheep and goats, Sheep Farming, Sheep & Lambs, Research, Sheep, Amniotic fluid

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