• C M Ho, M Y Tsou, M S Sun, C C Chu, and T Y Lee.
• Department of Anesthesiology, Veterans General Hospital-Taipei, Taiwan, R.O.C. hocm@ms29.hinet.net
• J Clin Anesth. 1999 Jun 1;11(4):296-300.

Study ObjectiveTo determine the optimal concentration of lidocaine that reduces pain on injection of a propofol-lidocaine mixture.DesignProspective, randomized, double-blinded, clinical investigation.SettingMedical center, university teaching hospital.Patients240 ASA physical status I and II female outpatients, aged 21 to 65 years, undergoing dilation and curettage with propofol for anesthesia induction.InterventionsPatients were randomized to one of four groups in double-blinded fashion. In Group A (control), patients were given propofol containing normal saline; in Group B, Group C, and Group D, patients received propofol containing 0.05% lidocaine (Group B), propofol containing 0.1% lidocaine (Group C), and propofol containing 0.2% lidocaine (Group D) for induction.Measurements And Main ResultsThe incidence of pain on injection of propofol was significantly decreased in Group C and Group D (8.3% and 10.0%, respectively) in comparison to the control group (91.7%) (p < 0.001). Although the result in Group B (76.7%) was better than that in the control group, the difference was not statistically significant. No significant difference was seen between Group C and Group D.ConclusionsThe optimal effective concentration of lidocaine, which decreased the incidence of pain caused by propofol injection, was 0.1% in the currently studied population.

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