Premium
Effect of auriculopalpebral nerve block on Schirmer tear test I values in normal horses
Author(s) -
Visser Hannah E.,
Diehl Kathryn A.,
Whitley R. David,
Myrna Kathern E.
Publication year - 2017
Publication title -
veterinary ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.594
H-Index - 50
eISSN - 1463-5224
pISSN - 1463-5216
DOI - 10.1111/vop.12419
Subject(s) - schirmer test , horse , medicine , nerve block , block (permutation group theory) , ophthalmology , anesthesia , mathematics , dry eyes , paleontology , geometry , biology
Objective To compare Schirmer tear test I ( STTI ) values collected in normal horses with and without an auriculopalpebral nerve block. Procedure Schirmer tear test I values were measured in 20 clinically normal horses (38 eyes) with a median age of 12 years. The order of eyes tested was randomized. Within 24–48 h, at the same time of day, tear measurements were collected again after administration of an auriculopalpebral nerve block. Each block was performed a minimum of 5 min prior to each STT I. A repeated‐measures model was used to analyze differences between STT I values in eyes with and without nerve blocks incorporating within horse correlation between eyes. The mixed‐model included fixed factors of treatment and eye and a random intercept for each horse. An unstructured covariance structure was used. Results On average, STT I values measured in eyes after auriculopalpebral nerve blocks were 0.55 mm/min greater than those without nerve blocks. This difference was not statistically significant ( P = 0.5268). Conclusions There was no effect of auriculopalpebral nerve block on STT I values in normal horses.