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Identification of two subtypes of infantile acid maltase deficiency
1Department of Pediatrics, North Shore University Hospital, New York University School of Medicine, Manhasset, New York 11030, USA.
Insights
Infants with a milder form of acid maltase deficiency may survive longer with respiratory support. This form presents with less severe heart issues and no outflow obstruction, offering a better prognosis for affected infants.
Area of Science:
- Biochemistry
- Genetics
- Pediatric Cardiology
Background:
- Acid maltase deficiency (AMD), also known as Pompe disease, is a rare genetic disorder.
- Infantile-onset AMD typically presents with severe hypertrophic cardiomyopathy and early mortality.
Purpose of the Study:
- To describe a cohort of infantile AMD patients with a distinct clinical presentation.
- To investigate survival outcomes in this subgroup.
Main Methods:
- Retrospective review of 12 infants diagnosed with acid maltase deficiency.
- Clinical data analysis focusing on cardiac function, muscle weakness, and respiratory support.
Main Results:
- Identified 12 infants with AMD exhibiting less severe cardiomyopathy and no left ventricular outflow obstruction.
- Nine of these 12 infants survived longer, benefiting from assisted ventilation and supplemental intubation.
Conclusions:
- A subset of infantile AMD patients may have a less severe phenotype with improved survival.
- Respiratory support strategies can prolong survival in these patients.
Abstract:
Infantile patients with acid maltase deficiency have severe hypertrophic cardiomyopathy, left ventricular outflow obstruction, and generalized muscle weakness and die before 1 year of age. We identified 12 infants with acid maltase deficiency who had a similar clinical presentation but less severe cardiomyopathy and absence of left ventricular outflow obstruction, and 9 of 12 had longer survival with assisted ventilation and supplemental intubation.