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Recurrent Episodes of Twilight State due to Ornithine Transcarbamylase Deficiency: an adolescent female case treated successfully with phenylacetic acid Yuji Takahash 1 , Tetsuo Shimizu 1 , Kazuo Mishima 1 , Yasuo Hishkawa 1 , Goro Takada 2 1Department of Psychiatry, Akita Unversity, School of Medicine 2Department of Pediatrics, Akita University, School of Medicine Keyword: Ornithine transcarbamylase deficiency , Hyperammonemia , Phenylacetic acid , Mental retardation , Sodium valproate pp.373-382
Published Date 1992/4/15
DOI https://doi.org/10.11477/mf.1405903226
  • Abstract
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 A 16 year-old female patient with ornithine transcarbamylase (OTC) deficiency was presented. She had mental retardation. At the age of 12 when she entered a junior high school for handicapped children and boarded at a dormitory of the school, she was corrected for a longlasting unbalanced dietary habit. For 4 years after this, she repeatedly underwent episodes of twilight state lasting for 2 to 4 days nearly once every month. One month after the start of oral ingestion of sodium valproate (VPA), she suffered from ataxic gait, flapping finger tremor, sleepiness and childish, retarded behavior associated with aremarkably high level of blood ammonia (308.4 μg/ml). Laboratory examinations disclosed an increased orotic acid secretion in the urine. Final diagnosis of OTC deficiency was made by liver biopsy and measurement of OTC activity in the liver.

 After oral ingestion of phenylacetic acid, her blood ammonia was kept at a normal level even without dietary protein restriction. Simultaneously, her clinical symptoms, EEG abnormalities and the degree of her adaptation to school life were much improved.

 It was discussed that, had her condition had been properly diagnosed and appropriately treated during the early developmental stage, it is possible that her mental deterioration could have been prevented.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-126X 印刷版ISSN 0488-1281 医学書院

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