THE EFFECT OF EXTRADURAL ANALGESIA COMBINED WITH LIGHT GENERAL ANAESTHESIA AND SPONTANEOUS VENTILATION ON ARTERIAL BLOOD-GASES AND PHYSIOLOGICAL DEADSPACE
Open Access
- 1 September 1975
- journal article
- research article
- Published by Elsevier in British Journal of Anaesthesia
- Vol. 47 (9) , 955-961
- https://doi.org/10.1093/bja/47.9.955
Abstract
SUMMARYArterial Po2 and Pco2 were measured at half-hourly intervals in eleven patients anaesthetized for lower limb vascular surgery with a combination of nitrous oxide 67% and halothane 0.3-0.5% in oxygen, and an extradural injection of bupivacaine. Values for the alveolar-arterial oxygen tension difference, physiological deadspace and deadspace-tidal volume ratio were calculated. Although both the alveolar-arterial oxygen tension difference and physiological deadspace were large, spontaneous ventilation was adequate to maintain both Po2 and Pco2 of arterial blood at acceptable values. Over the course of 2 hr following the extradural injection there were no significant changes in any measured value.Keywords
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