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In a double-blind, double-dummy study, the efficacy of topical 5% EMLA cream was compared with that of lignocaine infiltration in alleviating the pain of arterial cannulation. Forty unpremedicated adults were allocated randomly to four groups to receive EMLA cream alone, EMLA and 0.9% saline infiltration, EMLA and 1% lignocaine infiltration or placebo cream and 1% lignocaine infiltration. Following arterial cannulation, pain was assessed by the patient using a visual analogue score and by an independent observer using a four-category verbal rating score. Significantly lower pain scores were observed in all patients receiving EMLA compared with those receiving placebo cream and lignocaine infiltration by both patient (P less than 0.01) and observer (P less than 0.001) assessments. There were no significant differences between the three EMLA groups.
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