18º Congresso Brasileiro de Neurologia Infantil

Dados do Trabalho


Isovaleric Acidemia associated with an intellectual disability: case report

Apresentação do caso

The subject of the study was a 15-years-old girl in the ninth grade of elementary school. She was diagnosed with isovaleric acidemia in the neonatal period through screening tests performed. Despite her being treated with L-carnitine, Biotin, L-Glycine and Metabolic Formula for her pathology, since entering school, the patient had performed poorly, especially in language and calculation subjects. Furthermore, she had difficulty making friends with the same age as her and was socially isolated. The patient was then diagnosed with mild intellectual disability.


Isovaleric acidemia (IVA) is a hereditary metabolic disorder in which there is a inadequacy of isovaleryl-CoA dehydrogenase, an enzyme that catalyzes the third step in leucine catabolism. This metabolic alteration leads to an accumulation of isovaleric acid, isovaleryl-carnitine, 3-hidroxyisovaleric acid and isovalerylglycine.
There are two forms of IVA, an acute and a chronic form. It may present as an acute episode of metabolic acidosis causing a drop in consciousness, coma, and death. The chronic form is associated with episodes of metabolic decompensation in catabolic states, manifesting itself through delayed neuropsychomotor development, which may note be presente until the child is a year old.
Although IVA is, largely, a metabolic disease, it can be presented with other clinical features. Some studies have shown that it can be associated with neurological defities, such as motor sindromes and cognitive disabilities.

Comentários finais

Isovaleric acidemia has a wide range of clinical forms of presentation, and there are forms that are asymptomatic or with mild cognitive changes. In our patient, it started a standard course, but later on the disorder evolved with a mild intellectual disability. The purpose of this report is to show an uncommon finding in an organic aciduria.

Referências (se houver)

1. Khan A, Zahid B, Khan S, Ahmad SA. Isovaleric Acidemia: A Rare Case of an Inborn Error of Metabolism. Cureus. 2020 Feb 29;12(2):e7150. doi: 10.7759/cureus.7150. PMID: 32257695; PMCID: PMC7108672.
2. Grünert SC, Wendel U, Lindner M, Leichsenring M, Schwab KO, Vockley J, Lehnert W, Ensenauer R. Clinical and neurocognitive outcome in symptomatic isovaleric acidemia. Orphanet J Rare Dis. 2012 Jan 25;7:9. doi: 10.1186/1750-1172-7-9. PMID: 22277694; PMCID: PMC3292949.
3. Schlune A, Riederer A, Mayatepek E, Ensenauer R. Aspects of Newborn Screening in Isovaleric Acidemia. Int J Neonatal Screen. 2018 Jan 29;4(1):7. doi: 10.3390/ijns4010007. PMID: 33072933; PMCID: PMC7548899.

Palavras Chave

Isovaleric acidemia ; intellectual disability; metabolic disease.

Fonte de Fomento (se houver)

Declaração de conflito de interesses de TODOS os autores

Não há conflito de interesses




HUB - Distrito Federal - Brasil


Priscila Martins Câmara, Tiago Rocha Araújo, Pedro Guilherme Barros Tavares , Débora Santos Mendes , Henrique Innocencio De Paula, Lisiane Seguti , Jeanne Mazza