[Changes in the amount of blood in the uterus and placenta of rats in prolonged pregnancy].

The authors examined the amount of blood in the vessels of the placenta, uterus, liver and kidneys of white rats with prolonged pregnancy. The model of prolonged gestation is obtained after administration of progesterone during the last days of pregnancy. The results reveal that the amount of blood in the vessels of the uterus and placenta of rats with prolonged pregnancy is statistically significantly reduced (in the uterus 3,7 and 4,8 gammas per 100 mg of tissue, but in the placenta 3,76 and 8,8 gammas respectively and p less than 0,05). the authors explain these changes in the altered permeability of the vessels of the uterus and placenta in rats with prolonged pregnancy. These results clarify the high percentage of hypoxia in rats with prolonged pregnancy, which is of clinical significance.