INCREASED VENTILATION REQUIREMENTS DURING OBSTETRIC GENERAL ANAESTHESIA |
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Authors: | RAMPTON, A. J. MALLAIAH, S. GARRETT, C. P. O. |
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Affiliation: | Department of Anaesthesia, University College Hospital Gower Street, London WC1E 6AU. |
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Abstract: | The inspiratory fresh gas flow rate (FGF) required to producean end-tidal carbon dioxide tension (PE' CO2)of 4kPa duringgeneral anaesthesia, neuromuscular blockade and artificial ventilation,was compared in a group of 46 obstetric patients and a matchedgroup of 50 non-pregnant female patients. The non-pregnant patientsrequired a mean (SD) inspiratory FGF of 77 (10.6) ml kg1min1, whereas the pregnant patients required a mean FGFof 121 (24.6) ml kg1 min1 before delivery (inthose who reached a stable state), and 109 (19.3) ml kg1min1 after delivery. These represent significant (P <0.0001) increases of 57% and 42%, respectively, over the non-pregnantstate. *Anaesthetics Unit, The London Hospital, Whitechapel, LondonEl IBB.335, Southampton Road, Titchfield, Hants PO14 4AX.Northampton General Hospital, Whitechapel, London E1 1BB. |
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