Better understand the semiology of the dysgraphia in DCD children by highlighting a motor control disorder
Notice bibliographique
Résumé
Introduction Handwriting is mainly a motor process involving an efficient level of motor organization lead-ing to fine coordination of movements, thus, children with developmental coordination disorder (DCD) are particularly affected with handwriting disorders. Objectives We aimed to investigate handwriting disorders in DCD children in order to better understand the semiology of dysgraphia. Methods Data from 65 children aged 5 to 15 years (mean age 8.9 years, SD = 2.5) with DCD were collected on DSM-V criteria. They had no other medical or psychiatric condition and born full-term. They were assessed with handwriting testing and standardized assessments of neuropsychological, neurovisual, MRI and neuropsychomotor functions (NP-MOT neurodevelopmental battery), including muscular tone examination. Particular attention was paid to minor neurological dysfunctions (MND) which can be detected with the NP-MOT battery, such as a mild phasic stretch reflex (PSR). Results Findings showed a high rate of visual perceptual motor, visuo-spatial, and visuo-constructional impairments (> 82%), visual pursuit disorders (93%) and 89% of handwriting disorders (HD, n=58). Among these HD, there are 83% of poor handwriting (PH) and 17% of dysgraphia (DysG). Moreover, we found in HD, 36% of PSR (with 29% in PH vs 70% in DysG) correlated to imbalance of axial tone (hyper-extension) associated with increase of neuropsychomotor disorders such as dissonance between spontaneous gestural, usual and psychosocial lateralities (P = 0.03), impairments of coordination between upper and lower limbs (P = 0.001), impairments of manual dexterity (P < 0.001), impairments of dynamic balance (P = 0.002), and dysdiadochokinesis (P < 0.001). Comparing PH and DysG groups, dysgraphia is associated to PSR (P = 0.04). 38% of abnormal MRI scans were heterogeneous and non-specific to the level of handwriting disorder and to PSR. Conclusions Dysgraphia appears to be a singular disorder as a comorbidity of DCD, which is significantly associated with a high incidence of motor impairments, suggesting a disturbance of the motor pathway (mild distal spasticity of the pyramidal corticospinal tract dysfunction). The presence of MND such as PSR highlights a mild impairment of the motor voluntary movement from the premotor cortex. PH appears primarily due to an immaturity of handwriting gesture consecutive to disorders of coordination programming in DCD. Dysgraphia should be assessed not only with a simple handwriting test (legibility and speed) but completed with a developmental standardized physical neuropsychomotor examination assessing the presence of MND because to know the nature of the disorder is useful in clinical decision-making processes for handwriting remediation. Disclosure of Interest None Declared
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».