Phenylephrine eyedrops as a diagnostic test in equine grass sickness.
The effect of an ocular administration of the alpha-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.
Hahn
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CN
Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, Roslin, Midlothian.
Mayhew
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D000316:Adrenergic alpha-Agonists / Q000008:administration & dosage; D000818:Animals; D001342:Autonomic Nervous System Diseases / Q000150:complications / Q000175:diagnosis / Q000662:veterinary*; D001763:Blepharoptosis / Q000175:diagnosis / Q000209:etiology / Q000662:veterinary*; D016022:Case-Control Studies; D006734:Horse Diseases / Q000175:diagnosis* / Q000209:etiology; D006736:Horses; D009883:Ophthalmic Solutions; D010656:Phenylephrine / Q000008:administration & dosage; D006109:Poaceae; D011237:Predictive Value of Tests
D000316:Adrenergic alpha-Agonists; D009883:Ophthalmic Solutions; D010656:Phenylephrine