PMID: 9713004Aug 26, 1998Paper

Neurological outcome of methylmalonic acidaemia

Archives of Disease in Childhood
P NicolaidesR A Surtees


To assess the long term outcome of patients with methylmalonic acidaemia in a cross sectional study. All 35 patients with methylmalonic acidaemia seen at Great Ormond Street Hospital for Children in London, UK between 1970 and 1996 were studied. They were divided into cobalamin responsive (n = 6) and non-responsive (n = 29), and early and late onset groups. There was a significant difference between cobalamin responsive and non-responsive groups in severity, survival, and incidence of neurological sequelae. Cobalamin responsive patients had mild disease, irrespective of age at presentation, their neurological complications were less severe, and they are all alive. The cobalamin non-responsive group comprised 19 early and nine late onset patients. The early onset patients had more severe disease at presentation and 14 have died; all late onset patients are alive. There was no significant difference in abnormal neurological signs, although early onset patients had a significantly reduced full scale intelligence quotient and poor cognitive outcome. In both groups, abnormal neurological signs continue to increase with age. Cobalamin responsive patients have a better long term outcome. The outcome in the non-responsive patients, par...Continue Reading


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