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Syndromic retinitis pigmentosa: ERG and phenotypic changes
J Fleischhauer1, W A Njoh, G Niemeyer
1University Hospital of Zürich, Department of Ophthalmology, Zürich, Switzerland. johannes.fleischhauer@usz.ch
Klinische Monatsblatter Fur Augenheilkunde
|March 24, 2005
Summary
Syndromic Retinitis Pigmentosa (SRP) presents with diverse phenotypes and Electroretinogram (ERG) changes that are not specific to individual syndromes. ERG testing is crucial for diagnosis and detecting associated handicaps.
Area of Science:
- Ophthalmology
- Genetics
- Clinical Neuroscience
Background:
- Syndromic Retinitis Pigmentosa (SRP) encompasses a group of inherited retinal diseases with systemic manifestations.
- Understanding the specific clinical features and Electroretinogram (ERG) patterns in SRP is essential for accurate diagnosis and management.
Purpose of the Study:
- To review the phenotypic characteristics and the extent of ERG changes in patients with syndromic Retinitis Pigmentosa (SRP).
- To determine if ERG findings can aid in differentiating between various subtypes of SRP.
Main Methods:
- A retrospective chart review of 82 patients diagnosed with SRP over 20 years.
- Comparison of clinical data with full-field ERG results, including rod-driven, maximal dark-adapted, and cone-driven responses.
- Classification of ERG changes as normal, reduced, or extinguished.
Main Results:
- The study included patients with Usher syndrome (45), Laurence-Moon-Bardet-Biedl (LMBB) syndrome (17), Kearns-Sayre syndrome (10), Batten disease (6), Refsum disease (3), and Senior-Loken syndrome (1).
- ERG changes exhibited significant variation across different SRP subgroups and were not specific for any particular syndrome.
- Clinical presentations varied widely, often without apparent ophthalmoscopic changes.
Conclusions:
- The wide variability in clinical presentation of SRP mirrors that of isolated Retinitis Pigmentosa.
- Electroretinogram (ERG) testing is a critical tool for the differential diagnosis of SRP.
- ERG is vital for the early detection of multiple handicaps associated with syndromic forms of RP.