alexa Muscarinic receptor antagonist and an alpha-adrenergic agonist are required in combination to provide stable mydriasis following intravitreal injection in mice
ISSN: 0974-8369

Biology and Medicine
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Research Article

Muscarinic receptor antagonist and an alpha-adrenergic agonist are required in combination to provide stable mydriasis following intravitreal injection in mice

Abstract

Tropicamide (muscarinic receptor antagonist) and phenylephrine (α-adrenergic receptor agonist) are commonly used to dilate the pupils by topical application. These two eye drops are often used, singly or in combination, to dilate the pupil and perform acute light-evoked physiological experiments (electroretinography, for example), before and after intravitreal injections of pharmacological agents, as an assay for their affect on retinal activity. This study wanted to determine whether treatment with one of these drugs, or with both, is most effective in maintaining mydriasis after intravitreal injections. Changes in pupillary dilation before and after intravitreal injection of balanced salt solution (0.5 μl) were recorded. Phenylephrine (α-adrenergic agonist) and tropicamide (muscarinic agonist) when combined, but not singly, produced full and stable pupillary dilation following intravitreal injections. Re-instillation of topical mydriatics after intravitreal injections was required for maximal pupillary dilation. A combination of a muscarinic receptor antagonist and an alpha-adrenergic agonist is required for stable mydriasis following intravitreal injection

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