Visual electrophysiologic findings in patients from an extensive Brazilian family with Leber's hereditary optic neuropathy - Visual electrophysiology in LHON

Visual electrophysiologic findings in patients from an extensive Brazilian family with Leber's hereditary optic neuropathy - Visual electrophysiology in LHON

Author Salomão, Solange Rios Autor UNIFESP Google Scholar
Berezovsky, Adriana Autor UNIFESP Google Scholar
Andrade, R. E. Google Scholar
Belfort, R. Google Scholar
Carelli, Valerio Google Scholar
Sadun, Alfredo A. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Bologna
Univ So Calif
Abstract Leber's hereditary optic neuropathy (LHON) is a maternally inherited disease, associated with mitochondrial DNA (mtDNA) point mutations and characterized by bilateral, usually sequential, rapid loss of central vision. the purpose of this study was to investigate electrophysiologically a small cohort of members from an extensive Brazilian family affected by LHON. Pattern-reversal visual evoked potentials (PVEP), and full-field electroretinograms (ERG) were performed on the four index members, all carrying the 11778 homoplasmic mtDNA mutation. They were a 14-year-old recently affected male, his unaffected mother, and her two affected brothers. the three affected members all had bilateral profound visual loss with visual acuities that ranged from 20/250 to CF, cecocentral defects, and severe dyschromatopsia (by FM-100). the unaffected (carrier) female had normal visual acuities, visual fields and color discrimination. Severely prolonged P100 latencies and decreased N75-P100 peak amplitudes were found in pattern-reversal VEPs for three affected members. Normal PVEP responses were found in the carrier female. Rod and cone ERG responses were normal in two affected members, but both the carrier mother and her affected son showed reduced peak-to-peak amplitude for single-flash cone response and 30 Hz flicker, with normal b-wave implicit times. Thus, optic nerve function, evaluated by PVEP, was severely reduced in LHON affected members and normal in the carrier female. However, reduced ERG cone responses suggest that LHON can also affect retinal elements, even in the absence of fundus and other clinical changes that constitute the full and classical expression of LHON.
Keywords electroretinography
LHON
visual acuity
visual fields
visually evoked potentials
Language English
Date 2004-03-01
Published in Documenta Ophthalmologica. Dordrecht: Kluwer Academic Publ, v. 108, n. 2, p. 147-155, 2004.
ISSN 0012-4486 (Sherpa/Romeo, impact factor)
Publisher Kluwer Academic Publ
Extent 147-155
Origin http://dx.doi.org/10.1023/B:DOOP.0000036829.37053.31
Access rights Closed access
Type Article
Web of Science ID WOS:000223605400005
URI http://repositorio.unifesp.br/handle/11600/27659

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