Untangling adaptive functioning of PMM2-CDG across age and its impact on parental stress: a cross-sectional study.

Phosphomannomutase deficiency (PMM2-CDG) leads to cerebellar atrophy with ataxia, dysmetria, and intellectual deficits. Despite advances in therapy, the cognitive and adaptive profile remains unknown. Our study explores the adaptive profile of 37 PMM2-CDG patients, examining its association with parental stress and medical characteristics. Assessment tools included ICARS for the cerebellar syndrome and NPCRS for global disease severity. Behavioral and adaptive evaluation consisted of the Vineland Adaptive Behavior Scale and the Health of the Nation Outcome Scales. Psychopathological screening involved the Child Behavior Checklist and the Symptom Check-List-90-R. Parental stress was evaluated using Parental Stress Index. Results were correlated with clinical features. No significant age or sex differences were found. 'Daily living skills' were notably affected. Patients severely affected exhibited lower adaptive skill values, as did those with lipodystrophy and inverted nipples. Greater severity in motor cerebellar syndrome, behavioral disturbances and the presence of comorbidities such as hyperactivity, autistic features and moderate-to-severe intellectual disability correlated with greater parental stress. Our study found no decline in adaptive abilities. We provide tools to assess adaptive deficits in PMM2-CDG patients, emphasizing the importance of addressing communication, daily living skills, and autonomy, and their impact on parental stress in clinical monitoring and future therapies.

[Spanish multicenter study: hyperammonemia not associated with inborn errors of metabolism in children]. / Estudio multicéntrico español: niños con hiperamoniemia no asociada a errores innatos del metabolismo.

INTRODUCTION: The hyperammonemic encephalopathy induced by causes different from inborn errors of metabolism is a relatively uncommon but severe complication. OBJETIVES: To study the characteristics of a secondary hyperammonemia episode to discern the triggering causes to get to the diagnosis, and the development in the therapeutic intervention. METHODS: A multicenter retrospective study of children with hyperammonemia unrelated to inborn errors of metabolism, conducted in Spanish hospitals. RESULTS: Nineteen patients were selected; hyperammonemia developed in infants under one year old in 47% of them, being diagnosed mostly with two or more symptoms. The most common clinical finding was an altered consciousness level similar to that of intoxication symptoms, followed by seizures. These clinical symptoms were present in 14 patients, with one of them or both. Twelve of the 19 patients were in treatment with more than two antiepileptic drugs routinely. All children were treated with protein restriction (n: 10), scavengers (n: 10) and/or carglumic acid (n: 12) for the treatment of hyperammonemia. CONCLUSIONS: This study suggests that secondary hyperammonemia could be underdiagnosed because it is only detected when severe symptoms appear. Risk seems to be higher in those patients receiving antiepileptic drugs or those critically ill with a restricted diet or incremented metabolism. The response to specific treatment is adequate but should be established earlier to avoid neurological sequelae of this entity.

INTRODUCCIÓN: la encefalopatía hiperamoniémica inducida por causas diferentes a los errores innatos del metabolismo es una complicación relativamente infrecuente, pero muy grave. OBJETIVOS: conocer las características de un episodio de hiperamoniemia secundaria, tratar de discernir las causas desencadenantes, cómo se llega al diagnóstico del episodio y cómo se desarrolla la actuación terapéutica. MÉTODOS: es un estudio multicéntrico retrospectivo de casos pediátricos con hiperamoniemia no relacionada con errores innatos del metabolismo, llevado a cabo en hospitales españoles. RESULTADOS: fueron seleccionados 19 pacientes y en un 47% el episodio de hiperamoniemia apareció en menores de un año, que fueron diagnosticados mayoritariamente con dos o más síntomas. La clínica más frecuente fue la de alteración del nivel de conciencia tipo intoxicación, seguida de las crisis convulsivas, sumando en ambas hasta 14 pacientes con alguna de ellas o las dos. Doce de los 19 pacientes utilizaban más de dos fármacos antiepilépticos de forma habitual. Todos los niños recibieron tratamiento con restricción proteica (n: 10), quelantes (n: 10) y/o ácido carglúmico (n: 12) para el tratamiento de la hiperamoniemia. CONCLUSIONES: este estudio sugiere que la hiperamoniemia secundaria puede estar infradiagnosticada y solo se detecta cuando aparece una sintomatología grave. Parecen ser pacientes de riesgo aquellos que reciben fármacos antiepilépticos o aquellos críticos con una alimentación restringida o un metabolismo elevado. La respuesta con tratamiento específico es adecuada pero debe ser precoz para evitar las secuelas neurológicas de esta entidad.