British Journal of Anaesthesia, 1986, Vol. 58, No. 4 394-400
© 1986 The Board of Management and Trustees of the British Journal of Anaesthesia
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COMPARISON OF THE INCIDENCE AND NATURE OF CARDIAC ARRHYTHMIAS OCCURRING DURING ISOFLURANE OR HALOTHANE ANAESTHESIA
Studies During Dental Surgery
Department of Anaesthetics, Faculty of Dentistry, University of Hong Kong, Prince Philip Dental Hospital 34 Hospital Road, Hong Kong
Cardiology Unit, Faculty of Medicine, University of Hong Kong, Queen Mary Hospital Pokfulam Road, Hong Kong
* Address for correspondence: Block 4, 14th Floor, Flat E, Pokfulam Gardens, 180 Pokfulam Road, Hong Kong.
Seventy-six Chinese patients aged between 15 and 30 yr, undergoing 3rd molar extraction, were randomly allocated to two groups. One group received halothane and the other isoflurane. The incidence of arrhythmia during surgery under anaesthesia with isoflurane was significantly less than with halothane. Sinus tachycardia was a significant feature under anaesthesia with isoflurane. Under anaesthesia with halothane, the arrhythmias occurring most frequently during surgery were ventricular ectoplcs, the commonest being ventricular bigemlny. The frequency and nature of arrhythmias during surgery on right and left sides were similar. In three patients a slight decrease in arterial pressure was recorded in association with the arrhythmia, but on stopping the stimulus, both rhythm and arterial pressure returned to normal. The incidence of arrhythmia with halothane in the Chinese population in this study was significantly higher than that reported previously in non-Chinese patients.