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British Journal of Anaesthesia, 1985, Vol. 57, No. 8 743-746
© 1985 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

EFFECT OF SPEED OF INJECTION ON INDUCTION OF ANAESTHESIA USING PROPOFOL

G. ROLLY, M.D, L. VERSICHELEN, M.D, L. HUYGHE, M.D and H. MUNGROOP, M.D

University of Ghent, Department of Anaesthesia, Academic Hospital, De Pintelaan 185, B-9000 Ghent, Belgium.

Sixty unpremedicated patients (30 male) were randomly allocated to three groups. They received an induction dose of propofol 2 mg kg-1 over 5, 20 or 60 s to a forearm vein. Anaesthesia was maintained with conventional inhalation anaesthetic agents. Anaesthesia was induced satisfactorily in all 20 of the patients in the 5-s group, in 19 of the patients in the 20-s group and in 18 of the patients in the 60s group. The rate of injection had a significant influence on induction time. Mean induction time increased from 21.5 to 34.7 and 50.5s, when injection time was increased from 5- to 20 to 60s, respectively. Similar induction times were found in male and female patients. There was no significant difference between the groups, in depth of anaesthesia obtained — as assessed by the eyelash reflex. Mean arterial pressure decreased to the same extent in all three groups. Two minutes after induction, mean systolic arterial pressure was reduced by 15.1, 13.5 and 19.3 mm Hg in the 5-, 20- and 60-s groups, respectively, and mean diastolic arterial pressure by 10.3, 13.2 and 13.7 mm Hg. Heart rate changes were insignificant. Apnoea of more than 10 s duration was seen frequently in all three groups, but the results suggest that the incidence was not influenced by the rate of injection. Three patients experienced mild pain at the time of injection. No major adverse reactions occurred during or after anaesthesia.


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