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Neurocognitive functioning in school-aged cystinosis patients

M T P Besouw1, G M Hulstijn-Dirkmaat, R E A van der Rijken

  • 1Department of Pediatrics/Pediatric Nephrology, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium.

Journal of Inherited Metabolic Disease
|September 4, 2010
PubMed

Insights

Children with cystinosis, a rare genetic disorder, often face learning difficulties despite normal intelligence. This study found specific neurocognitive deficits in treated patients, highlighting the need for early diagnosis and support.

Area of Science:

  • Pediatric Nephrology
  • Neurodevelopmental Disorders
  • Genetic Diseases

Background:

  • Cystinosis is an inherited disorder causing cystine accumulation, leading to kidney failure and potential learning difficulties in children.
  • While cysteamine treatment manages physical symptoms, its effect on cognitive function remains unclear.
  • Learning problems in cystinosis patients may stem from specific neurocognitive deficits rather than solely kidney issues.

Purpose of the Study:

  • To assess the neurocognitive functioning of school-aged cystinosis patients receiving cysteamine treatment.
  • To identify specific cognitive deficits that may contribute to learning difficulties in this population.

Main Methods:

  • Evaluated 14 Dutch and Belgian school-aged cystinosis patients.
  • Assessed general intelligence, visual-motor integration, attention, memory, planning, processing speed, and behavior using standardized tests.
  • Estimated glomerular filtration rate (GFR) using the Schwartz formula.

Main Results:

  • Median full-scale intelligence quotient (IQ) was below average, with a notable gap between verbal and performance IQ.
  • Over half of the patients exhibited deficits in visual-motor integration, sustained attention, visual memory, planning, and motor speed.
  • GFR varied widely (22-120 ml/min/1.73 m²), but cognitive deficits were observed independently of renal function levels.

Conclusions:

  • Neurocognitive assessment is crucial for children with cystinosis.
  • Early identification of specific cognitive deficits can guide interventions.
  • Special education support may mitigate learning difficulties and improve academic outcomes for cystinosis patients.
Abstract

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