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MfERG waveform characteristics in the RS1h mouse model featuring a 'negative' ERG
Mathias W Seeliger1, Bernhard H F Weber, Dorothea Besch
1Retinal Electrodiagnostics Research Group, University Eye Hospital Department II, Schleichstr. 12-16, D-72076 Tübingen, Germany. see@uni-tuebingen.de
Documenta Ophthalmologica. Advances in Ophthalmology
|August 9, 2003
Summary
The Rs1h(-/Y) mouse model exhibits a
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Retinal disorders can cause a 'negative' electroretinogram (ERG) waveform, characterized by reduced b-wave amplitude relative to the a-wave.
- X-linked juvenile retinoschisis is a condition associated with 'negative' ERG findings.
Purpose of the Study:
- To characterize multifocal electroretinogram (mfERG) waveforms in the Rs1h(-/Y) mouse model of x-linked juvenile retinoschisis.
- To investigate the influence of recording parameters, specifically high-pass filter settings and artifact removal, on mfERG waveform shape in this model.
Main Methods:
- mfERGs were recorded using a VERIS 4 system integrated with a scanning-laser ophthalmoscope (SLO) for real-time fundus visualization.
- High-pass filter settings were adjusted (from 10 Hz down to 2 Hz) and the artifact removal feature's time interval was varied to assess their impact on waveform morphology.
Main Results:
- The Rs1h(-/Y) mouse model demonstrated a 'negative' mfERG waveform when a lower high-pass filter (around 2 Hz) was employed.
- Standard high-pass filter settings (10 Hz) or short artifact removal intervals obscured the 'negative' waveform, resulting in a predominantly positive peak.
Conclusions:
- The Rs1h(-/Y) mouse is a suitable model for studying retinal diseases with 'negative' ERG waveforms.
- Accurate recording of 'negative' mfERG waveforms in such conditions requires lower high-pass filter cutoff frequencies and careful use of artifact removal settings to prevent waveform distortion.