• Rosaya Phahonthep, Wannasri Sindhuphak, and Pin Sriprajittichai.
• Division of Dermatology, Department of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
• J Med Assoc Thai. 2004 Sep 1; 87 Suppl 2: S15-8.

BackgroundTopical anesthesia for skin surgery has widely been used for a long time. Various preparations are used. The EMLA cream is the most popular one.ObjectiveThe authors compared the local analgesic effect of topical lidocaine iontophoresis and EMLA cream in a crossover study design.MethodAfter informed consent, 16 patients with seborrheic keratosis, who required CO2 laser surgery, were enrolled. Two lesions on the opposite side of the body with a comparable size, shape and location were selected from each patient. The lidocaine iontophoresis was done on one lesion and the EMLA cream was applied on the other The CO2 laser surgery was performed after 10 min of lidocaine iontophoresis and 60 min after EMLA cream. The level of pain was recorded using a 100-mm visual analog scale. Ratings of patient satisfaction were also assessed.ResultsThere were no significant differences in pain scores between the two groups (p=0.968), but significantly higher in satisfaction scores (1-5 scale) in the iontophoretic group than the EMLA group (p=0.005). Fifteen patients preferred lidocaine iontophoresis (93.8%), none preferred EMLA cream. All patients in the present study tolerated the tingling and burning sensations. No severe adverse events and side effects were detected.ConclusionLidocaine iontophoresis provides effective pain relief for CO2 laser surgery of seborrheic keratosis as well as the EMLA cream. The effect is as fast as 10 min after application. There is no significant side effect. Most of the patients were satisfied. Lidocaine iontophoresis is a useful, noninvasive local anesthesia for CO2 laser surgery of superficial skin lesions.

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