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CHANGES IN FETAL TCPO2 VALUES OCCURRING DURING LABOUR IN ASSOCIATION WITH LUMBAR EXTRADURAL ANALGESIA |
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| Authors: | WILLCOURT, ROBIN J. PAUST, JOAN C. QUEENAN, JOHN T. |
| Affiliation: | Department of Obstetrics and Gynecology, Kapiolari-Children's Medical Center 1319 Punahou Street, Honolulu, Hawaii 96826 Department of Anesthesia, Louisville General Hospital Louisville, Kentucky, U.S A Department of Obstetrics and Gynecology, Georgetown University Hospital Washington, D.C , U.S.A |
| Abstract: | Forty-six of 64 high risk labours were managed with continuouslumbar extradural analgesia. Fetal heart rate (FHR) and continuoustranscutaneous PO2 (tcPO2) measurements were made in the 64patients. Abnormal fetal heart rate patterns and low tcP02 valuesassociated with the onset of the extradural block were notedin 9% of these cases A decrease in maternal arterial pressureand uterine hypertonus appeared to be responsible, singly orm combination, for the changes. These effects and the changesin FHR were not seen in the 18 mothers not receiving extraduralanalgesia. The supine position was associated with slightlysmaller fetal tcPo2 values than the preferred lateral positions,with a significant worsening of the fetal tcPo2 values afterinduction of the extradural block although, overall, extraduralanalgesia neither improved nor impaired the fetal tcPo2 |
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