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Arterial and venous pressures in the human umbilical cord

1967; Elsevier BV; Volume: 98; Issue: 2 Linguagem: Inglês

10.1016/s0002-9378(16)34596-3

1097-6868

Percy Malpas, Michael Symonds,

Neonatal Respiratory Health Research

Measurements of the pressure in the umbilical arteries and vein were made during eleven cesarean sections performed under general anesthesia. The maternal blood pressure was recorded at the same time. Nine of the babies were normal with no signs of depression. In 8 cases the average umbilical arterial pressure was 88 mm. Hg with an average pulse pressure of 12 mm. Hg. In 3 of the cases arterial spasm precluded measurement of the arterial pulse pressure. In the umbilical vein the average pressure was 41 mm. Hg and no venous pulse pressure was observed. The high venous pressure is discussed in the light it throws on the pressure gradients of the placenta. A further observation was made at the fourteenth week of pregnancy. The lower transplacental pressure gradient which was present suggests that the modes of transplacental interchange between fetus and mother become modified as pregnancy proceeds and the fetus assumes its full role as the organizer of development. Measurements of the pressure in the umbilical arteries and vein were made during eleven cesarean sections performed under general anesthesia. The maternal blood pressure was recorded at the same time. Nine of the babies were normal with no signs of depression. In 8 cases the average umbilical arterial pressure was 88 mm. Hg with an average pulse pressure of 12 mm. Hg. In 3 of the cases arterial spasm precluded measurement of the arterial pulse pressure. In the umbilical vein the average pressure was 41 mm. Hg and no venous pulse pressure was observed. The high venous pressure is discussed in the light it throws on the pressure gradients of the placenta. A further observation was made at the fourteenth week of pregnancy. The lower transplacental pressure gradient which was present suggests that the modes of transplacental interchange between fetus and mother become modified as pregnancy proceeds and the fetus assumes its full role as the organizer of development.