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This study investigated propofol injection pain in patients undergoing ambulatory anaesthesia. In a randomized, double-blind trial, 90 women were allocated to receive one of three treatments prior to induction of anaesthesia with propofol. Patients in Group C received 2 ml normal saline, Group L, 2 ml, lidocaine 2% (40 mg) and Group T, 2 ml thiopentone 2.5% (50 mg). Venous discomfort was assessed with a visual analogue scale (VAS) 5-15 sec after commencing propofol administration using an infusion pump (rate 1000 micrograms.kg-1.min-1). Loss of consciousness occurred in 60-90 sec. Visual analogue scores (mean +/- SD) during induction were lower in Groups L (3.3 +/- 2.5) and T (4.1 +/- 2.7) than in Group C (5.6 +/- 2.3); P = 0.0031. The incidence of venous discomfort was lower in Group L (76.6%; P &lt; 0.05) than in Group C (100%) but not different from Group T (90%). The VAS scores for recall of pain in the recovery room were correlated with the VAS scores during induction (r = 0.7045; P &lt; 0.0001). Recovery room discharge times were similar: C (75.9 +/- 19.4 min); L 73.6 +/- 21.6 min); T (77.1 +/- 18.9 min). Assessing their overall satisfaction, 89.7% would choose propofol anaesthesia again. We conclude that lidocaine reduces the incidence and severity of propofol injection pain in ambulatory patients whereas thiopentone only reduces its severity.

Thiopentone pretreatment for propofol injection pain in ambulatory patients