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The influence on foetal outcome of maternal Pco 2  at caesarean section under general anaesthesia was assessed in 27 “clinically acceptable ideal patients” as defined by Crawford. 1  A standard anaesthetic technique was employed which utilised left lateral tilt and an F 1 o 2  of 0.5. A highly significant relationship (p &lt; 0.001) was found between umbilical vein Po 2  and maternal end-tidal Pco 2  in the range 20-40 mmHg, such that hypocarbia was associated with a lowering of umbilical vein Po 2 . In spite of this relationship, only three values of Po 2  were less than normal (28 mmHg). No relationship was found between clinically measured parameters of foetal outcome and maternal end-tidal Pco 2 . The relevant literature is reviewed.

The Influence on Foetal Outcome of Maternal Carbon Dioxide Tension at Caesarean Section under General Anaesthesia