[Evaluation of adhesive tape containing lidocaine using current perception threshold measurement].
Lidocaine adhesive tape (Penles; Wyeth Lederle Japan, Ltd, Tokyo, Japan) is placed for pain relief prior to puncturing a vein with a needle. We investigated the optimal time interval from application of Penles to vein puncture by measuring current perception threshold (CPT) levels with a Neurometer, by which it was possible to measure the extent of nerve block in a non-invasive and quantitative manner with 3 electrical stimulus rates (2000 Hz, 250 Hz, and 5 Hz). Penles was applied to the dorsum of volunteers' hands for 1, 2, 4, 6 and 12 hours before measuring CPT levels. With a stimulation rate of 2000 Hz and 250 Hz, CPT, levels were found to increase 4 hours after the Penles application, while peak CPT levels for 5 Hz stimulation were observed from 6 to 12 hours after application. However, CPT levels tended to decrease 12 hours after application, regardless of the stimulus rate. From the result, we conclude that Penles provides maximum benefit when applied 6 hours prior to vein puncture.
Egi
A
A
Department of Anesthesia and Intensive Care, Hiroshima City Asa Hospital, Hiroshima 731-0293.
Sanuki
M
M
Kinoshita
H
H
Fujii
K
K
D000287:Administration, Topical; D000328:Adult; D004056:Differential Threshold; D004304:Dosage Forms; D004558:Electric Stimulation; D006801:Humans; D008012:Lidocaine / Q000008:administration & dosage* / Q000494:pharmacology; D008297:Male; D008875:Middle Aged; D012677:Sensation / Q000187:drug effects*; D013997:Time Factors
D004304:Dosage Forms; D008012:Lidocaine