J Clin Monit Comput - Skin conductance for monitoring of acute pain in adult postoperative patients: influence of electrode surface area and sampling time.

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Resumo

Aim of this prospective randomized study was to determine the influence of the electrode surface area and sampling time on the accuracy of the number of fluctuations in skin conductance per second to distinguish different states of acute pain. These methodological issues have been previously suggested as an explanation for contradictory data related to the accuracy of the skin conductance monitor. A total of 541 pain ratings on a numeric rating scale (0-10) were obtained from 120 adult postoperative patients. The number of fluctuations in skin conductance per second was recorded using two different electrode types (surface area 254 vs. 474 mm(2)) and sampling times (7.5 vs. 30 s). A longer sampling time did result in higher values for the number of fluctuations in skin conductance per second, though without improving its accuracy to distinguish different states of pain. However, the latter was found improved when the smaller surface area electrodes were used. A combination of small surface area electrodes and a 30 s sampling time resulted in the highest area under the curve in the receiver operating curve analysis of the method to identify states of moderate to severe pain (numeric rating scale > 3): 0.68 vs. e.g. 0.55 [data from all patients combined]). We conclude that the type of electrodes used but only to a lesser degree the sampling time influence the accuracy of the number of fluctuations in skin conductance per second to identify states of moderate or severe postoperative pain.

Resumo Limpo

aim prospect random studi determin influenc electrod surfac area sampl time accuraci number fluctuat skin conduct per second distinguish differ state acut pain methodolog issu previous suggest explan contradictori data relat accuraci skin conduct monitor total pain rate numer rate scale obtain adult postop patient number fluctuat skin conduct per second record use two differ electrod type surfac area vs mm sampl time vs s longer sampl time result higher valu number fluctuat skin conduct per second though without improv accuraci distinguish differ state pain howev latter found improv smaller surfac area electrod use combin small surfac area electrod s sampl time result highest area curv receiv oper curv analysi method identifi state moder sever pain numer rate scale vs eg data patient combin conclud type electrod use lesser degre sampl time influenc accuraci number fluctuat skin conduct per second identifi state moder sever postop pain

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