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Electrophysiology of type II mesangiocapillary glomerulonephritis with associated fundus abnormalities
C O'Brien1, J Duvall-Young, M Brown
1Royal Liverpool University Hospital.
Abstract:
The retinal electrophysiology is reported in four patients with type II mesangiocapillary glomerulonephritis and partial lipodystrophy with associated fundus abnormalities and no visual symptoms. The histological hallmark of the condition is that of widespread electron dense deposits in the renal glomerulus and in the choriocapillaris and Bruch's membrane of the eye. Three of the four patients had the typical fundal appearance of multiple, yellow, drusen-like lesions at the posterior pole of the eye with normal visual acuity. These three patients had abnormally low Arden ratios on electro-oculography with normal electroretinography responses. This is the first clinical model of disease known to be isolated to the choriocapillaris and Bruch's membrane causing an electro-oculographic abnormality without any clinically detectable deficit in visual function.
Insights
This study reports on retinal electrophysiology in four patients with mesangiocapillary glomerulonephritis and partial lipodystrophy. Findings reveal electro-oculography abnormalities in the absence of visual symptoms, highlighting a novel disease model.
Area of Science:
- Ophthalmology
- Nephrology
- Genetics
Background:
- Mesangiocapillary glomerulonephritis (MCG) with partial lipodystrophy is a rare condition.
- Histological findings include electron-dense deposits in renal glomeruli and ocular tissues.
- Ocular manifestations can occur but visual symptoms are not always present.
Purpose of the Study:
- To investigate retinal electrophysiology in patients with MCG and partial lipodystrophy.
- To characterize fundus abnormalities and their correlation with visual function.
- To establish a clinical model for diseases affecting the choriocapillaris and Bruch's membrane.
Main Methods:
- Retinal electrophysiology, including electro-oculography (EOG) and electroretinography (ERG).
- Ophthalmic examination and fundus photography.
- Review of clinical and histological data.
Main Results:
- Four patients with MCG and partial lipodystrophy were studied.
- Three patients exhibited drusen-like lesions and abnormal Arden ratios on EOG, despite normal visual acuity and ERG.
- Electron-dense deposits were observed in the renal glomeruli, choriocapillaris, and Bruch's membrane.
Conclusions:
- This study presents the first clinical model of disease isolated to the choriocapillaris and Bruch's membrane.
- Electrophysiological abnormalities (EOG) can precede clinically detectable visual deficits.
- Ocular findings in this condition highlight the importance of comprehensive eye examinations.