ArticleOrphanet journal of rare diseases2025
Late-onset Pompe's disease in pediatrics: results from an Italian national survey on 38 patients and proposal of a targeted diagnostic algorithm.
Article in Orphanet journal of rare diseases, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundLate-onset Pompe's disease (LOPD) is a progressive treatable metabolic myopathy due to partial acid α-glucosidase (GAA) deficiency, with potential onset during the pediatric age. To date, Pompe's disease is not widely included in newborn screening panels, so that clinical suspect remains essential for timely diagnosis and management. Clinical identification of LOPD was shown to be challenging in adult patients, whereas data in children and adolescents are scanty. We conducted an Italian nationwide multicentric survey in order to delineate the characteristics of LOPD in the pediatric population. This prompted us to propose a diagnostic algorithm to facilitate the identification of LOPD in pediatrics.
resultsThe survey provided information on 38 Italian pediatric patients with a definite biochemical and molecular diagnosis of LOPD firstly suspected based on clinical approach. Nineteen patients (50%) reached medical attention because of clinical symptoms of LOPD (79% within 3 years of age; 21% at 3-18 years of age) and 19 (50%) because of incidental finding of asymptomatic hyperCKemia. All the 38 LOPD patients showed hyperCKemia (56%: range 500-1000 U/l; 18%; range 250-500 U/l; 18% range 1000-2000 U/l; 8% >2000 U/l), almost invariably accompained by concomitant hypertransaminasemia (91%). Main clinical symptoms before 3 years of age were inability to (1) sit at 8 months, (2) walk indipendently at 18 months, and (3) climb stairs at 30 months. Later pediatric presentations (3-18 years of age) were limitation to (1) get up from supine position, (2) perform sport activity, and (3) run. In symptomatic patients, diagnostic latency (i.e. the time interval between clinical onset and diagnosis of LOPD) ranged from < 1 year (58%) to 2-12 years (42%).
conclusionsClinical diagnosis of LOPD in pediatrics is challenging in spite of its frequent presentation within 3 years of age. A selective screening by measuring GAA activity on dried blood spot in the two main clinical diagnostic contexts of LOPD in pediatrics - namely (1) age-related myopathic symptoms or (2) asymptomatic hyperCKemia (and hypertransaminasemia) - will likely ensure diagnostic anticipation for those patients not screened for Pompe's disease in the neonatal period.
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