Continuous acid‐base assessment of the human fetus during labour by tissue pH and transcutaneous carbon dioxide monitoring

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Abstract
Summary. Simultaneous monitoring of fetal tissue pH (t‐pH) and transcutaneous carbon dioxide (Tc‐Pco2) was performed in 30 labours. Both t‐pH and Te‐Pco‐2 at delivery were positively correlated with pH (r= 0·69) and Pco2(r= 0·68) of the umbilical artery blood. A tissue/transcutaneous standard base excess (t‐SBE) was derived from the t‐pH and the Tc‐Pco2 and calculated for 13 fetuses a t delivery; there was a correlation with standard base excess of umbilical artery blood. An analysis of t‐pH and Tc‐Pco2 changes during the last hour of labour revealed that only infants who were born with decreased pH of the umbilical artery blood had decreasing t‐SBE, while all others had a constant t‐SBE.

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