A Simplified Method for the Measurement of Nocturnal Scratching with an Infrared Video Camera.

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  • IZUMI Hirono
    Department of Dermatology, Jikei Universitiy School of Medicine
  • EBATA Toshiya
    Department of Dermatology, Jikei Universitiy School of Medicine
  • SATO Yuko
    Department of Dermatology, Jikei Universitiy School of Medicine
  • AIZAWA Hiroshi
    Department of Dermatology, Jikei Universitiy School of Medicine
  • KAMIDE Ryoichi
    Department of Dermatology, Jikei Universitiy School of Medicine
  • NIIMURA Michihito
    Department of Dermatology, Jikei Universitiy School of Medicine

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Other Title
  • 赤外線ビデオカメラを用いた夜間掻破の測定の簡便法

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Abstract

Measurement of nocturnal scratching with an infrared video camera accurately catches the action of scratching, but its quantitative analysis is troublesome. When we played the video tape using the search mode five times as fast as the real speed, we could distinguish scratching bouts lasting (a) 10-29 seconds, (b) 30-59 seconds and (c) 60 seconds. Thus, we counted the presence of each type of scratching bouts on a minute basis and calculated the simplified score (SS) as (a+b×2+c×3)/hr. SS proved to correlate extremely highly with TST%(total scratching time %), the index of amount of scratching we have been using for the measurement of itch in atopic dermatitis. TST% is the percent rate of summed durations of scratching to the total recording time throughout the night. The relationship between the two parameters was found to be TST%= 0.57×SS. This simplified method can be performed easily and it reliably reflects the amount of scratching and thus, can be used to expect TST%.

Journal

  • Skin research

    Skin research 39 (6), 560-563, 1997

    Meeting of Osaka Dermatological Association

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