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The Veterinary Record, Vol 147, Issue 21, 603-606
Copyright © 2000 by British Veterinary Association

Phenylephrine eyedrops as a diagnostic test in equine grass sickness

C. N. Hahn BS, DVM, MSc, MRCVS1 and I. G. Mayhew BVSc, PhD, DipACVIM, DipECVN, FRCVS1

1 Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, Easter Bush, Roslin, Midlothian EH25 9RG

The effect of an ocular administration of the agr-1 adrenergic agonist phenylephrine was studied in 23 cases of grass sickness and 12 control horses. In the horses with grass sickness there was a significantly greater mean increase in the size of the palpebral fissure, as measured by the change in the angle of the eyelashes to the head observed from a frontal view.






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