• T S Shomaker, J Zhang, G Love, S Basta, and M A Ashburn.
• Department of Anesthesiology, University of Utah School of Medicine, Salt Lake City 84132, USA. samuel.shomaker@hsc.utah.edu
• Clin J Pain. 2000 Sep 1; 16 (3): 200-4.

ObjectiveThe objective of this study was to evaluate the depth and duration of skin anesthesia after the administration of a local anesthetic system consisting of an S-Caine (Zars, Salt Lake City, UT) patch coupled with a controlled heat-aided drug delivery (CHADD; Zars) patch.DesignThe study design was a randomized, double-blind, placebo-controlled, two-period crossover trial.PatientsTwelve healthy adult volunteers between the ages of 18 and 50 years were enrolled.Interventions And Outcome MeasuresAfter administration of the study drug or placebo, vital signs (blood pressure, pulse, respiratory rate) were monitored and recorded, and depth and duration of anesthesia were determined and recorded at defined intervals for 10 to 120 minutes after treatment. Depth of anesthesia was measured with a 21-gauge short-bevel needle attached to a depth gauge, and duration was measured using a 0 to 2 (0 = no sensation, 1 = dull sensation, 2 = sharp scratching sensation) verbal report scale.ResultsStatistically significant differences were noted in both depth and duration of anesthesia between the active and placebo groups. The posttreatment mean for anesthetic depth in the active group was 6.8 mm compared with 4.7 mm for control group (p = 0.050). The median anesthetic duration was greater than 120 minutes for the active group compared with less than 10 minutes for the placebo group (p = 0.001).ConclusionsThe local anesthetic system consisting of a combination of S-Caine and CHADD patches provided a statistically significant dermal anesthesia effect compared with placebo in this volunteer study. If confirmed in other studies, this system has promise as a noninvasive method of producing dermal anesthesia for minor surgical procedures or intravenous insertion.

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