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Erschienen in: Pediatric Nephrology 7/2022

18.11.2021 | Original Article

Clinical and neurophysiological characterization of early neuromuscular involvement in children and adolescents with nephropathic cystinosis

verfasst von: Nour Elkhateeb, Rasha Selim, Neveen A. Soliman, Fatma M. Atia, Ihab Ibrahim Abouelwoun, Mohamed. A. Elmonem, Rasha Helmy

Erschienen in: Pediatric Nephrology | Ausgabe 7/2022

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Abstract

Background

Nephropathic cystinosis is a rare autosomal recessive lysosomal storage disorder characterized by kidney and extra-renal complications due to the accumulation of cystine crystals in various tissues and organs. Herein, we describe the early neuromuscular complications in a cohort of pediatric nephropathic cystinosis patients.

Methods

We prospectively evaluated the clinical, biochemical, and neurophysiological data of 15 cystinosis patients. Neurophysiological evaluation was performed to confirm or exclude presence of neuropathy and/or myopathy.

Results

Patients’ age ranged between 20 and 216 months at time of examination. Nine patients were males. Three patients had early abnormal neurophysiological features consistent with neuromuscular involvement (clinically asymptomatic proximal myopathy with a patchy distribution in one patient and isolated asymptomatic sensory nerve conduction changes in two patients). A fourth patient had mixed abnormal motor and sensory axonal neuropathic changes associated with overt clinical features (predominantly motor symptoms). Patients with abnormal neuromuscular features were significantly older in age than the unaffected group (P = 0.005) and had a diagnosis of cystinosis with subsequent cysteamine therapy at a significantly older age than the unaffected group (P = 0.027 and 0.001, respectively).

Conclusions

We expanded the recognized phenotypes of cystinosis neuromuscular complications with early proximal skeletal myopathy and symptomatic motor and sensory axonal neuropathy. Early asymptomatic neuromuscular complications could develop in pediatric patients and would require neurophysiological studies for early detection prior to development of overt clinical manifestations. Prompt diagnosis and timely initiation of cysteamine therapy with recommended dose can delay the development of neuromuscular complications.

Graphical abstract

A higher resolution version of the Graphical abstract is available as Supplementary information
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Metadaten
Titel
Clinical and neurophysiological characterization of early neuromuscular involvement in children and adolescents with nephropathic cystinosis
verfasst von
Nour Elkhateeb
Rasha Selim
Neveen A. Soliman
Fatma M. Atia
Ihab Ibrahim Abouelwoun
Mohamed. A. Elmonem
Rasha Helmy
Publikationsdatum
18.11.2021
Verlag
Springer Berlin Heidelberg
Erschienen in
Pediatric Nephrology / Ausgabe 7/2022
Print ISSN: 0931-041X
Elektronische ISSN: 1432-198X
DOI
https://doi.org/10.1007/s00467-021-05343-x

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