Capsaicin-induced pain sensitivity in short tear break-up time dry eye

Minako Kaido, Sachiko Inoue, Motoko Kawashima, Reiko Ishida, Shigeru Nakamura, Kazuo Tsubota

研究成果: Article査読

抄録

Purpose: To evaluate transient receptor potential vanilloid 1 (TRPV1)-mediated pain sensitivity in patients with short tear break-up time (TBUT) dry eye (DE) by using the capsaicin stimulus test. Methods: This prospective cross-sectional comparative study included 22 eyes of 22 patients with short TBUT DE and 11 eyes of 11 non-DE control subjects. Patients were divided into two groups based on response to standard DE treatments: 10 non-responders (intractable DE) and 12 responders (responsive DE). Mechanical touch (M-touch) and mechanical pain (M-pain) were measured using a Cochet-Bonnet esthesiometer. Capsaicin-induced pain (C-pain) and C-pain duration (C-pain DT) were measured using a capsaicin stimulus test. Psychological distress was also assessed. Results: M-touch sensitivity was similar among all three groups. M-pain sensitivity was higher in the responsive DE group than in the intractable DE and control groups (P <.001). C-pain sensitivity was lower (P <.001) in the intractable DE group than in the responsive DE and control groups, and C-pain DT was shorter (P =.006) in the intractable DE group than in the responsive DE group. Psychological distress was higher in the intractable DE group than in the control group (P <.001). Conclusions: Patients with intractable short TBUT DE were less sensitive to the effects of capsaicin than patients with responsive short TBUT DE and controls. Altered neural activation may contribute to the development of DE symptoms in the short TBUT DE subjects. The capsaicin stimulus test may be used to better understand pain sensitivity in short TBUT DE patients.

本文言語English
ページ(範囲)620-626
ページ数7
ジャーナルOcular Surface
18
4
DOI
出版ステータスPublished - 2020 10

ASJC Scopus subject areas

  • Ophthalmology

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