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British Journal of Anaesthesia, 1980, Vol. 52, No. 1 55-60
© 1980 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

LUMBAR EXTRADURAL INJECTION PRESSURES IN PREGNANT WOMEN

An investigation of relationships between rate of injection, injection pressures and extent of analgesia

R. P. HUSEMEYER, M.R.C.O.G. and D. C. WHITE, F.F.A.R.C.S.

Division of Perinatal Medicine Clinical Research Centre and Northwick Park Hospital, Watford Road, Harrow, Middlesex, HA1 3UJ
Department of Anaesthesia Clinical Research Centre and Northwick Park Hospital, Watford Road, Harrow, Middlesex, HA1 3UJ

Before the induction of labour in 34 pregnant women 1.5% lignocaine 10 ml was injected into the lumbar extradural space at constant rates between 0.143 and 0.333 ml s–1. Injection pressures and residual pressures were recorded and the extent of analgesia to pinprick was assessed. No significant correlation was found between the rate of injection and injection pressures or residual pressures over the range investigated. Analgesia was significantly more extensive on the side dependent during injections, but there was no significant correlation between the overall extent of analgesia and the rate of injection, injection pressures or residual pressures in the extradural space. It is concluded that there is no advantage from rapid extradural injections.


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