Abstract
The configuration and progression of the ERG in two children with mucopolysaccharidosis (MPS) I H/S (Hurler–Scheie syndrome) and MPS I H (Hurler syndrome) is described. Physical examination, biochemical analysis, ophthalmic examination and electroretinography were performed. The Hurler–Scheie patient (case 1) showed negative scotopic but normal photopic ERGs, which remained unchanged over 2 years. The Hurler patient (case 2) showed negative scotopic and photopic ERGs which did not alter after bone marrow transplantation (BMT). One year after BMT, further b-wave amplitude reduction had caused the ERGs to become more negative. The electronegative configuration of the ERGs suggests that, in these cases of MPS, the primary retinal abnormality in MPS I may be faulty synaptic transmission from photoreceptors to more proximal elements, deficient bipolar responsivity, or Muller cell disease. Further degradation with time suggests the defect to be progressive with BMT causing little or no improvement. In the Hurler–Scheie syndrome case, the defect appears to spare the cone system and to show little or no progression.
Notes
To maximise the chance of obtaining ERG data from unsedated infants and children, our clinical protocols include both full-field and hand-held Grass flash stimulation with normative data for both. In adult comparisons, ERGs using the full-field stimulus show larger amplitudes (despite the lower luminance, 2.5 phot cd s m−2 compared to 11.8 phot cd s m−2), particularly for the b-wave.
Abbreviations
- BMT:
-
Bone marrow transplant
- GAG:
-
Glycosaminoglycans
- MPS:
-
Mucopolysaccharidoses
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Tzetzi, D., Hamilton, R., Robinson, P.H. et al. Negative ERGs in mucopolysaccharidoses (MPS) Hurler–Scheie (I-H/S) and Hurler (I-H)-syndromes. Doc Ophthalmol 114, 153–158 (2007). https://doi.org/10.1007/s10633-007-9047-z
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DOI: https://doi.org/10.1007/s10633-007-9047-z