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British Journal of Anaesthesia, 2002, Vol. 89, No. 6 849-852
© 2002 The Board of Management and Trustees of the British Journal of Anaesthesia

Clinical Investigations

Effects of intramuscular administration of lidocaine or bupivacaine on induction and maintenance doses of propofol evaluated by bispectral index

M. Senturk*, K. Pembeci, F. Menda, T. Ozkan, B. Gucyetmez, M. Tugrul, E. Camci and K. Akpir

Department of Anaesthesiology, Istanbul University, Istanbul Medical Faculty, Capa 34390, Istanbul, Turkey merthasta@yahoo.com

Background. Interest in combining local and general anaesthesia has lead to studies investigating possible interactions. In a prospective, randomized, double-blind study, we tested whether local anaesthetics administered i.m. potentiate the hypnotic effect of propofol.

Methods. Sixty patients (three groups, n=20) undergoing lower abdominal surgery with total i.v. propofol anaesthesia were investigated. Patients in Group B received i.m. bupivacaine (5 mg ml–1) 1 mg kg–1, patients in Group L received i.m. lidocaine (100 mg ml–1) 2 mg kg–1 and patients in Group C received i.m. saline 5 ml before operation. Hypnosis was measured with bispectral index (BIS).

Results. The induction (BIS <45), and the maintenance doses of propofol (BIS between 40 and 50) were significantly less in Group B and Group L compared with the control group. Induction doses were 1.58 (SD 0.39), 1.56 (0.24) and 2.03 (0.33) mg kg–1 respectively; P<0.0001. Maintenance doses were 6.33 (2.06), 7.08 (1.23) and 9.95 (2.02) mg kg–1 respectively in the first hour; P<0.0001. Groups B and L were associated with an attenuated haemodynamic response to both induction and intubation.

Conclusion. I.M. administered local anaesthetics are associated with a decrease in both the induction and maintenance doses of propofol during total i.v. anaesthesia and a reduction in haemodynamic responses.

Br J Anaesth 2002; 89: 849–52


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