Passive permeability and outward active transport of fluorescein across the blood-retinal barrier in early ARM

The British Journal of Ophthalmology
B MoldowH Lund-Andersen

Abstract

To study the passive and active transport of fluorescein across the blood-retina barrier in early age related maculopathy (ARM) (soft drusen > 63 microm, hyperpigmentation and/or hypopigmentation in patients above 50 years of age). 15 patients and 10 healthy subjects were included. Morphological changes were graded from 30 degrees fundus photographs using a simplified version of the epidemiological ARM study group classification system. Differential vitreous spectrofluorophotometry was used to assess the transport properties of the blood-retina barrier (that is, passive permeability and unidirectional permeability caused by outward active transport from the vitreous to the blood). The passive permeability of the patient group was not significantly different from that of the control group. Four patients with passive permeability more than 3 SD above the mean of the control group (mean 1.8 (SD 0.7) nm/s, range 1.0-3.0 nm/s, data normally distributed) all had centrally located drusen > 500 microm and superjacent pigment clumps of 63-500 microm in diameter. There was no significant difference between the unidirectional permeabilities for the patient group and for the control group (mean 47.4 (29.3) nm/s, range 12.7-91.1 nm/s). Ther...Continue Reading

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Citations

Dec 18, 2013·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Kalika L BandamwarQian Garrett
Oct 22, 2010·Current Eye Research·Nikhil Kumar PalakurthiRupak K Banerjee
Sep 30, 2008·NMR in Biomedicine·Gary L TrickBruce A Berkowitz
May 1, 2021·Biomedical Physics & Engineering Express·Aisling MannTraian V Chirila

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