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British Journal of Anaesthesia, 2000, Vol. 84, No. 6 777-782
© 2000 Oxford University Press

Laboratory Investigation

Vagally mediated sympathoexcitation and central depression by desflurane in rabbits

C. K. Pac-Soo1,2, C. Wang1, D. Ma1, M. K. Chakrabarti1 and J. G. Whitwam1

1 Department of Anaesthetics and Intensive Care, Imperial College School of Medicine, Hammersmith Hospital, Du Cane Road, London W12 ONN, UK

Abstract

The effects of desflurane on renal sympathetic nerve activity (RSNA) were studied in intact or vagotomized anaesthetized rabbits with initial concentrations of 4.5–18%, subsequently equilibrated to end-tidal concentrations from 3%, 6%, 9% and 12% each for 20 min allowing sympathetic activity to stabilize. In intact animals, immediate transient increases in mean sympathetic activity from 27% to 63% were closely related to initial concentrations from 4.5% to 18%. During subsequent equilibration this remained elevated by 25–30% up to 6%, returned to control at 9% and fell by 33% at 12%. Bilateral vagotomy abolished sympathoexcitation apart from small increases in sympathetic activity, for example 14% at 4.5% (P<0.05). We conclude that increases in inspired desflurane concentrations evoked rapid transient vagally mediated reflex sympathoexcitation with a small extra-vagal contribution. Central depression of sympathetic activity started at 6% and was 33% below baseline at 12%.

Footnotes

2 Present address: Department of Anaesthetics, Wycombe Hospital, Queen Alexandra Road, Buckinghamshire HP11 2TT, UK


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