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Journal of Child Neurology
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Topical Review Article: Organic Acidurias: A Review. Part 1

Pinar T. Ozand, MD, PhD

Department of Pediatrics, Biological and Medical Research, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia

Generoso G. Gascon, MD

Department of Pediatrics

Organic acidemias are disorders of intermediary metabolism that lead to accumulation of organic acids in biologic fluids, disturb acid-base balance, and derange intracellular biochemical pathways. Their clinical presentation reflects the resultant systemic disease and progressive encephalopathy. While in some organic acidemias, disturbed acid-base metabolism is the predominant presenting feature, in others it is less prominent or even absent. The etiologies of the more than 50 different phenotypes include impaired metabolism of branched-chain amino acids, vitamins, glucose, lipids, glutathione, and {gamma}-aminobutyric acid and defects of oxidative phosphorylation. Most organic acidemias present with neurologic manifestations, which include acutely or subacutely progressive encephalopathy that involves different parts of the nervous system. The age of presentation and the associated systemic, hematologic, and immune findings provide additional guidelines for differential diagnosis. We summarize major organic acidemias, while emphasizing their usual and unusual neurologic presentations. ( J Child Neurol 1991;6:196-219).

Journal of Child Neurology, Vol. 6, No. 3, 196-219 (1991)
DOI: 10.1177/088307389100600302
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