[Acid-base equilibrium in umbilical blood vessels of fetuses with perinatal hypoxemia symptoms].

The aim of the study was to compare acid-base parameters in umbilical cord blood of fetus from groups with hypoxaemia symptoms and from the control group (physiological deliveries). 111 fetuses were divided into 8 groups. Group I consisted of 33 fetuses with normal heart rate baseline while groups II-VIII involved fetuses from complicated labours with hypoxaemia symptoms. The following characteristics of umbilical vessels blood: low pH, normal or increased PCO2, increased base deficit, low PO2 and PO2 in chronic hypoxaemia were found out. Acute hypoxaemia was characterised by lower pH, high PCO2, normal BE and lower PO2 and SO2.