British Journal of Anaesthesia, 1993, Vol. 71, No. 6 823-826
© 1993 The Board of Management and Trustees of the British Journal of Anaesthesia
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PHARMACOKINETICS OF I.V. AND RECTAL PETHIDINE IN CHILDREN UNDERGOING OPHTHALMIC SURGERY
Departments of Ophthalmology and Anaesthesia, University of Helsinki and Department of Pharmacology and Toxicology, National Public Health Institute Helsinki, SF-00290, Finland
Address for correspondence: Department of Ophthalmology, Helsinki University Hospital, Haartmaninkatu 4 C, SF-00290 Helsinki, Finland
We have studied the pharmacokinetics of i.v. and rectal pethidine in 20 children age 48 yr under going ophthalmic surgery. After i.v. administration, the clearance of pethidine was mean 10.4 (SD 1.7) ml kg1 min1, volume of distribution at steady state 2.8 (0.6) litre kg1 and elimination haff-ilfe 3.0 (0.5) h. After rectal administration, plasma pethidine concentrations varied greatly and peak concentrations appeared late, at 147 (44) mm. The mean systemic bioavailabiity after rectal admin istration was approximately 55%. Because the bioavailabiity of rectal pethidine varies greatly, this route is not encouraged in the management of acute pain. (Br. J. Anaesth. 1993; 71: 823826)
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