• Anesthesia and analgesia · Apr 2004

    Randomized Controlled Trial Clinical Trial

    Warm steaming enhances the topical anesthetic effect of lidocaine.

    • Young-Chang P Arai and Wasa Ueda.
    • Department of Anesthesiology, Kochi Municipal Hospital, School of Nursing, Kochi Medical School, Kochi, Japan. arainon@med.kochi-ms.ac.jp
    • Anesth. Analg. 2004 Apr 1; 98 (4): 982-5, table of contents.

    UnlabelledWarm steaming has been used for hydrating the skin, thereby increasing its permeability. We studied whether skin pretreatment with a steamed towel (at 45 degrees C) for 5 min could enhance the anesthetic effect of a topical lidocaine tape in 14 female volunteers. After each volunteer received the skin pretreatment on one of the forearms, lidocaine tape was applied for 30 min on both the treated and the untreated forearms. Superficial anesthesia was scored by recording the number of painful experience during 5 pinpricks delivered with a 27-gauge needle. To assess anesthesia of the deeper layer, single insertion of a 27-gauge needle to a depth of 3 mm was made and pain was scored by a visual analog scale (VAS). There were significant reductions in the scores of superficial anesthesia (median [range]: treated arm, 2 [0-5], versus untreated arm, 4 [1-5]; P < 0.01) and the VAS scores of deeper insertion (median [range]: treated arm, 4.5 [0-8], versus untreated arm, 8 [2-10]; P < 0.01). In conclusion, the application of a warm steamed towel enhanced the anesthetic effect of a topical lidocaine tape.ImplicationsWe showed that the skin pretreatment with a steamed towel (at 45 degrees C) enhanced the anesthetic effect of a topical lidocaine tape in female volunteers.

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