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Cognitive skills in achondroplasia
G Brinkmann1, H Schlitt, P Zorowka
1Children's Hospital, University of Mainz, Germany.
Insights
Children with achondroplasia often experience impaired verbal comprehension, potentially linked to ear infections and hypotonia. Early detection and intervention can help mitigate these developmental challenges.
Area of Science:
- Pediatric Neurology
- Developmental Psychology
Background:
- Achondroplasia is frequently associated with increased intracranial pressure and ventricular dilatation.
- Major neurological deficits are rare, but minor cerebral dysfunction warrants investigation.
Purpose of the Study:
- To identify signs of minor cerebral dysfunction in children with achondroplasia.
- To explore potential preventive strategies for these dysfunctions.
Main Methods:
- Compared 30 children with achondroplasia to sibling, dwarfism, and normal-height control groups.
- Assessed early development via questionnaires, cognitive skills using standardized tests, and personality traits.
- Utilized the German version of the Cognitive Abilities Test and Lorge-Thorndike Intelligence Test.
Main Results:
- Children with achondroplasia showed higher rates of delayed motor and speech development and lower language-related school grades.
- Psychometric testing revealed normal overall cognitive scores but significantly lower verbal comprehension subtest scores compared to controls.
- Verbal comprehension deficits were linked to frequent middle ear infections, conductive hearing loss, and hypotonia.
Conclusions:
- Verbal comprehension is significantly impaired in children with achondroplasia.
- Middle ear infections, hearing loss, hypotonia, and altered parental responses may contribute to these deficits.
- Further research into prevention and intervention strategies is recommended.
Abstract:
Increased intracranial pressure and ventricular and subarachnoidal dilatation are common manifestations in achondroplasia. They rarely lead to major neurologic and/or psychomotor deficits and neurosurgical intervention is seldom needed. The present study was undertaken to detect signs of minor cerebral dysfunction and discuss possibilities of their prevention. Thirty children with achondroplasia were compared to 3 control groups: their next-born sibs, 30 children with other forms of dwarfism, and 30 children with normal height. Early development was assessed by means of questionnaires. Cognitive skills were evaluated with the German version of the Cognitive Abilities Test and the Lorge-Thorndike Intelligence Test. Personality data were tested using standardized neuroticism, extraversion, and anxiety scales. Children with achondroplasia had more frequent histories of delayed motor development, retarded speech development, and lower school grades in language-related specialties. Psychometric testing disclosed total and subtest scores in the population-based normal range. In comparison with their sibs and matched controls children with achondroplasia had significantly lower total scores mainly caused by low scores in the subtest "verbal comprehension." We conclude that verbal comprehension is significantly impaired in children with achondroplasia. This partial deficiency is probably related to frequent middle ear infections and resulting conductive hearing loss. Hypotonia with delayed oropharyngeal muscle coordination and parental response to an altered, more infantile instinctive releasing pattern may be contributing factors.