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PURPOSE:To determine the effect of an adrenergic agonist and a cholinergic agonist on the lumen width of the nasolacrimal drainage system.DESIGN:Prospective,nonrandomized,clinical trial.METHODS:The asymptomatic sides of 33 patients(23 women,10 men)with unilateral stenosis/obstruction of the nasolacrimal drainage system were studied.The tear meniscus height of the asymptomatic side was normal,with a patent lacrimal system as reveled by dacryocystography.The nasolacrimal drainage system of the asymptomatic side was infused with 100 μ L of 5% phenylephrine hydrochloride(an α-1 adrenoceptor agonist)or 100 μ L of 2% pilocarpine hydrochloride(a cholinergic agonist),and dacryocystography was performed to determine the lumen width of the nasolacrimal drainage system.RESULTS:Phenylephrine caused a significant increase of the lumen width of the nasolacrimal drainage system,and the changes were more marked in the nasolacrimal duct(NLD),especially the upper and middle regions,than in the lacrimal sac.In contrast,pilocarpine reduced the lumen width of the NLD significantly,especially in the middle and lower regions,and the lumen width of the lacrimal sac was not significantly changed.CONCLUSION:The alterations of the lumen width of the nasolacrimal drainage system,especially the lumen width of the NLD by adrenergic and cholinergic agonists,suggest that the lumen width can be changed by the autonomic nervous system.
PURPOSE: To determine the effect of an adrenergic agonist and a cholinergic agonist on the lumen width of the nasolacrimal drainage system. DESIGN: Prospective, nonrandomized, clinical trial. METHODS: The asymptomatic sides of 33 patients (23 women, 10 men) with unilateral stenosis / obstruction of the nasolacrimal drainage system were studied. The tear meniscus height of the asymptomatic side was normal, with a patent lacrimal system as reveled by dacryocystography. nasalcrimal drainage system of the asymptomatic side was infused with 100 μL of 5% phenylephrine hydrochloride (an α-1 adrenoceptor agonist) or 100 μL of 2% pilocarpine hydrochloride (a cholinergic agonist), and dacryocystography was performed to determine the lumen width of the nasolacrimal drainage system .RESULTS: Phenylephrine caused a significant increase of the lumen width of the nasolacrimal drainage system, and the changes were more marked in the nasolacrimal duct (NLD), especially the upper and middle regions, than in the lacrim al sac. contrast, pilocarpine reduced the lumen width of the nasolacrimal drainage system, especially in the middle and lower regions, and the lumen width of the lacrimal sac was not significantly changed. CONCLUSION: The alterations of the lumen width of the nasolacrimal drainage system , especially the lumen width of the NLD by adrenergic and cholinergic agonists, suggest that the lumen width can be changed by the autonomic nervous system.