The effect of nipradilol, an a-ß blocker, on retinal blood flow in healthy volunteers

Abstract

PURPOSE: To study the effects of topically applied nipradilol, an alpha-beta blocker recently developed in Japan as an ocular hypotensive drug, on retinal blood flow (RBF) in healthy volunteers. METHODS: Seven healthy volunteers (mean age, 33 years) underwent measurement of RBF using a newly developed stabilized laser Doppler velocimetry system. In a double-blind trial, retinal arterial blood flow, intraocular pressure (IOP), and blood pressure (BP) were measured before and after the instillation of nipradilol or saline every hour for 5 hours. RESULTS: Retinal arterial blood flow and the diameter of the retinal artery significantly (p< 0.05) increased at 4 hours after instillation in nipradilol-treated eyes. Retinal blood velocity did not change significantly. Nipradilol evoked a significant (p< 0.05) bilateral decrease in IOP. Mean BP decreased significantly (p< 0.05) 3 hours after instillation. Ocular perfusion pressure (OPP), calculated from the mean BP and IOP, did not change significantly during the study. CONCLUSION: Topical nipradilol significantly increased retinal arterial blood flow in healthy volunteers, not through a secondary effect dependent on a change in OPP, but likely through the vasodilatory action of the drug.