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British Journal of Anaesthesia, Vol 76, Issue 2 214-220, Copyright © 1996 by The Board of Management and Trustees of the British Journal of Anaesthesia

CLINICAL INVESTIGATIONS

Influence of oral clonidine on the ventilatory response to acute and sustained isocapnic hypoxia in human males

I. T. Foo, P. M. Warren and G. B. Drummond
Department of Anaesthetics, Royal Infirmary, Edinburgh, University of Edinbrugh, Edinburgh; Rayne Laboratory, Unit of Respiratory Medicine, Department of Medicine, Royal Infirmary, Edinburgh, University of Edinbrugh, Edinburgh

Animal studies suggest that alpha 2 agonists inhibit the chemoreceptor response to hypoxia. We have examined the effect of oral clonidine on the ventilatory response to sustained, isocapnic hypoxia (SpO2 79.7% (SD 1.1%) for 20 min) in eight male subjects. The hypoxic ventilatory response was measured before and after both clonidine and placebo. Clonidine had no significant effect on baseline ventilation or gas exchange. After clonidine, the acute hypoxic response (AHR) (mean 5.81 (95% confidence limits 1.94, 9.68) litre min-1) was significantly less than control (10.40 (5.97, 14.83) litre min-1) and hypoxic ventilatory decline (HVD) (3.42(2.35, 4.49) litre min-1) was also significantly less than control (6.49(3.92, 9.06) litre min-1) (P < 0.05). After placebo, AHR was similar to control but HVD was significantly larger (6.82(5.28, 8.36) litre min-1) than control (4.79(3.03, 6.55) litre min- 1) (P < 0.05). Thus clonidine reduced both AHR and HVD but the absolute level of ventilation at the end of hypoxia was unchanged.
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