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Title: Preclinical investigation of the retinal biocompatibility of six novel vital dyes for chromovitrectomy
Authors: Rodrigues, Eduardo Buchele [UNIFESP]
Penha, Fernando Marcondes [UNIFESP]
Farah, Michel Eid [UNIFESP]
Costa, Elaine de Paula Fiod [UNIFESP]
Maia, Mauricio [UNIFESP]
Dib, Eduardo [UNIFESP]
Bottos, Juliana [UNIFESP]
Freymuller, Edna [UNIFESP]
Furlani, Bruno de Albuquerque [UNIFESP]
Meyer, Carsten H. [UNIFESP]
Magalhães, Octaviano [UNIFESP]
Lima-Filho, Acacio Alves Souza [UNIFESP]
Safatle, Angélica Mendonça de Vaz
Universidade Federal de São Paulo (UNIFESP)
Univ Bonn
Universidade de São Paulo (USP)
Keywords: chromovitrectomy
indocyanine green
fast green
vital dye
trypan blue
brilliant blue
bromophenol blue
Issue Date: 1-Apr-2009
Publisher: Lippincott Williams & Wilkins
Citation: Retina-the Journal Of Retinal And Vitreous Diseases. Philadelphia: Lippincott Williams & Wilkins, v. 29, n. 4, p. 497-510, 2009.
Abstract: Purpose: To investigate the retinal biocompatibility of six novel vital dyes for chromovitrectomy.Methods: An amount of 0.05 mL of 0.5% and 0.05% light green (LG), fast green (FG), Evans blue (EB), brilliant blue (BriB), bromophenol blue (BroB), or indigo carmine (IC) was injected intravitreally in the right eye, whereas in the left eye balanced salt solution was applied for control in rabbits' eyes. Clinical examination, fluorescein angiography, histology with light microscopy, and transmission electron microscopy were performed after 1 and 7 days. Retinal cell layers were evaluated for morphologic alterations and number of cells. The electroretinographic changes were assessed at baseline, 24 hours and 7 days.Results: Fluorescein angiography disclosed hypofluorescent spots only in the 0.5% EB group. Light microscopy and transmission electron microscopy disclosed slight focal morphologic changes in eyes exposed to 0.05% IC, FG, BriB, similar to the control at 1 and 7 days. In the lower dose groups, EB, LG, and BroB caused substantial retinal alterations by light microscopy. At the higher dose, BroB and EB produced diffuse cellular edema and vacuolization within the ganglion cells, bipolar cells, and photoreceptors. FG and IC at 0.5% caused slight retinal alterations similar to balanced salt solution injection. LG at 0.5% caused diffuse vacuolization of bipolar cells after 1 and 7 days. Injection of 0.5% EB caused a significant decrease in neuroretinal cell counts in comparison to control eyes in the 7-day examination (P < 0.05). Electroretinography revealed intermittent prolonged latency and decreased amplitude in eyes injected with 0.5% EB, LG, BriB, and BroB, while at the lower dose, only LG and EB induced few functional changes.Conclusion: The progressive order of retinal biocompatibility, from safest to most toxic, was IC, FG, BriB, BroB, LG, EB.
ISSN: 0275-004X
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Appears in Collections:Artigo

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