Abstract
We describe on a 3-year-old child referred for evaluation and therapy of a cerebral vascular accident with residual hemiplegia and partial epilepsy. Metabolic investigations initially showed normal urinary organic acids as well as normal blood and urinary amino acids. Blood carnitine fractions had been pathological and a secondary carnitine deficiency was diagnosed and treated by oral L-carnitine supplementation. During carnitine treatment, abnormal urinary acylcarnitine profiles were noticed with excessive amounts of several carnitine esters including propionylcarnitine, butyryl-and/or isobutyryl-carnitine, isovaleryl- and/or 2-methylbutyryl-carnitine, hexanoylcarnitine and octanoyl-carnitine. Subsequently, an urinary organic acid profile suggestive of glutaric aciduria type 11 was recorded during a clinical decompensation crisis. Morphological and biochemical studies on skeletal muscle and skin fibroblasts were performed and confirmed the existence of a defect of the mitochondrial β-oxidadation pathways with lipidic myopathy, reduced palmitate and octanoate oxidation rates in cultured fibroblasts. Glutaric aciduria type 11 increases the list of metabolic disorders characterized by hemiplegia and other sequelae of brain ischaemia such as stroke-like episode, seizures, aphasia, ataxia and myoclonia, similar to those seen in MELAS.
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Abbreviations
- ETF :
-
electron transfer flavoprotein
- ETF:QO :
-
electron transfer flavoprotein ubiquinone oxidoreductase
- MADD :
-
multipe acyl-CoA dehydrogenase deficiency (glutaric aciduria type II)
- MELAS :
-
mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes
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Vallée, L., Fontaine, M., Nuyts, JP. et al. Stroke, hemiparesis and deficient mitochondrial β-oxidation. Eur J Pediatr 153, 598–603 (1994). https://doi.org/10.1007/BF02190669
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DOI: https://doi.org/10.1007/BF02190669