Organic acidemia, also called organic aciduria, is a term used to classify a group of metabolic disorders which disrupt normal amino acid metabolism, particularly branched-chain amino acids, causing a buildup of acids which are usually not present.
Organic acids refer to the amino acids and certain odd-chained fatty acids which are affected by these disorders.
The branched-chain amino acids include isoleucine, leucine and valine.
Diagnosis and Symptoms
Organic acidemias are usually always diagnosed in infancy, characterized by urinary excretion of abnormal amounts or types of organic acids. The diagnosis is usually made by detecting an abnormal pattern of organic acids in a urine sample by gas chromatography - mass spectrometry. In some conditions, the urine is always abnormal, in others the characteristic substances are only present intermittently. Many of the organic acidemias are detectable by newborn screening with tandem mass spectrometry.
Most of the organic acidemias result from defective autosomalgenes for various enzymes important to amino acid metabolism. Neurological and physiological harm is caused by this impaired ability to synthesize a key enzyme required to break down a specific amino acid, or group of amino acids, resulting in acidemia and toxicity to specific organs systems. Most are inherited as autosomal recessive diseases.
Treatment or management of organic acidemias vary. There are no effective treatments for all of the conditions, though treatment for some may include a limited protein/high carbohydrate diet, intravenous fluids, amino acid substitution, vitamin supplementation, carnitine, induced anabolism, and in some cases, tube-feeding.
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