In Vitro Alteration of Schirmer's Tear Strip Wetting by Commonly Instilled Anesthetic Agents
作者:
Michael Hodkin,
Mont Cartwright,
Usha Kurumety,
期刊:
Cornea
(OVID Available online 1994)
卷期:
Volume 13,
issue 2
页码: 141-147
ISSN:0277-3740
年代: 1994
出版商: OVID
关键词: Schirmer's tear test;Fluress;Fluoracaine;Fluorescein;Dacriose;Dry eyes;Keratitis sicca;Schirmer's tear strip;Viscosity;Surface tension;Tonometry;Povidone;Glycerin;Tear secretion;Topical anesthesia
数据来源: OVID
摘要:
The Schirmer's tear test is often performed with topical anesthesia to reduce reflex tearing. Fluress (Barnes- Hind, Sunnyvale, CA, U.S.A.) and Fluoracaine (Akorn, Abita Springs, LA, U.S.A.) are commonly used anesthetic- fluorescein preparations that contain viscous additives. Because the rate of Schirmer's strip wetting is dependent on capillary action, a property related to solution viscosity and surface tension, spurious results may be obtained if these agents are used for anesthesia. We report in vitro Schirmer's strip wetting rates for various concentrations of Fluress and Fluoracaine, as well as pure fluorescein solution using a tear substitute (Dacriose; IOLAB, Claremont, CA, U.S.A.) as a diluent. Results showed a direct concentration-dependent reduction of Schirmer's strip wetting with time for both Fluress and Fluoracaine dilutions compared with Dacriose alone (p < 0.001) or Dacriose-fluorescein solutions (p < 0.001). In addition, Schirmer's wetting with Dacriose-fluorescein solutions caused a separation of the Dacriose and fluorescein wetting fronts (p < 0.001) but did not affect the overall Dacriose wetting. These data have clinical implications concerning false-positive results when testing for dry eyes.
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