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  • Title: A new perspective on canine keratoconjunctivitis sicca. Treatment with ophthalmic cyclosporine.
    Author: Kaswan RL, Salisbury MA.
    Journal: Vet Clin North Am Small Anim Pract; 1990 May; 20(3):583-613. PubMed ID: 2194349.
    Abstract:
    Keratoconjunctivitis sicca is the major cause of chronic or recurrent conjunctivitis in dogs. The diagnosis of KCS is often delayed or mistaken for allergic or bacterial conjunctivitis and inappropriate or insufficient treatment leads to progressive corneal scarring and blindness in many dogs. The cause of KCS in dogs has not been proven, but evidence supports an immune-mediated etiology for the majority of cases. In an attempt to specifically treat the cause of KCS, a new immunosuppressant drug, cyclosporine, has been used in a topical preparation. Treatment results using ophthalmic cyclosporine are dramatic compared with historical treatments. Resolution of corneal scarring and increased lacrimation are seen in most dogs. Investigations of the mechanism of action of ophthalmic cyclosporine suggest the efficacy may have been serendipitous. A local neuroendocrine effect of cyclosporine on the lacrimal gland may actually be responsible for the increased lacrimation. Early diagnosis of KCS and treatment with ophthalmic cyclosporine may avert a major cause of blindness in dogs.
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