The article deals with 140 cardiotocographic curves during opening and 147 curves during expulsion in puerpera in whom delivery was performed under cardiotocography and pH-metry. During different changes of foetal heart frequency pH values of foetal blood were determined. On the basis of cardiotocographic changes the examined group was divided into several subgroups. In each group the mean values of current pH were compared with the mean values of the control group. The control group consisted of 41 cardiotocographic curves during opening and 41 during expulsion in patients with normal delivery and clear foetal liquid. The pH of foetal blood was determined during opening and expulsion. Mean pH values of foetal blood were significantly lower during opening with expressed variable DIP-I and DIP-II as well as with slight and strong bradicardy. During expulsion a significant fall of mean pH values was observed only in the group with expressed variable DIP-I and DIP-II. Consequently the Apgar score of newborn infants was reduced. The mean pH values in other cardiotocographic changes were decreased but statistically insignificant. The same was observed in Apgar score.
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