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Vatinoxan Prevents Medetomidine-Associated Exophthalmos and Increased Glucose Concentrations in Blood and Aqueous

Minna P Mustikka1, Emily K-M Lindh1, Karoliina Alm2

  • 1Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.

Journal of Ocular Pharmacology and Therapeutics : the Official Journal of the Association for Ocular Pharmacology and Therapeutics
|July 14, 2026
PubMed
Abstract

Insights

Vatinoxan, an alpha2-adrenoceptor antagonist, prevented medetomidine-induced eye issues in rats, including exophthalmos and lens opacification. These ophthalmic changes appear independent of blood glucose levels.

Area of Science:

  • Ophthalmology
  • Pharmacology
  • Veterinary Medicine

Background:

  • Medetomidine is an alpha2-adrenoceptor agonist used for sedation in animals.
  • Medetomidine administration can cause acute ophthalmic changes, including exophthalmos and increased intraocular pressure.
  • The specific mechanisms underlying these medetomidine-associated ophthalmic changes are not fully understood.

Purpose of the Study:

  • To investigate the efficacy of vatinoxan, a peripherally selective alpha2-adrenoceptor antagonist, in preventing medetomidine-associated ophthalmic changes in rats.
  • To determine if vatinoxan can mitigate acute effects like exophthalmos, changes in intraocular pressure, and corneal thickness.
  • To explore the relationship between glycemic control and medetomidine-induced ophthalmic pathologies.

Main Methods:

  • Adult male Wistar rats were administered medetomidine and midazolam, with or without vatinoxan or insulin.
  • Ophthalmic parameters including globe position, lens clarity, intraocular pressure, and central corneal thickness were assessed.
  • Blood glucose and aqueous humor glucose concentrations were measured post-treatment.

Main Results:

  • Vatinoxan significantly prevented exophthalmos, lens opacification, and decreased intraocular pressure compared to controls.
  • Hyperglycemia and increased aqueous humor glucose were observed with medetomidine alone, partially mitigated by insulin but fully prevented by vatinoxan.
  • Acute alpha2-adrenoceptor agonist-mediated ophthalmic changes were found to be independent of glycemic control.

Conclusions:

  • Vatinoxan effectively counteracted medetomidine-induced ophthalmic alterations in rats.
  • The findings suggest that alpha2-adrenoceptor antagonism is key in preventing these specific ocular side effects.
  • Ophthalmic pathologies induced by alpha2-adrenoceptor agonists are not directly linked to hyperglycemia or altered glucose levels in aqueous humor.
Keywords:
alpha2-agonistcataractexophthalmosproptosisratvatinoxan

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