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European Journal of Pediatrics

, Volume 134, Issue 1, pp 57–63 | Cite as

Peritoneal dialysis in maple-syrup-urine disease: Studies on branched-chain amino and keto acids

  • U. Wendel
  • K. Becker
  • Hildegard Przyrembel
  • Monika Bulla
  • C. Manegold
  • Angelika Mench-Hoinowski
  • U. Langenbeck
Original Investigations

Abstract

We report biochemical data on a child with MSUD who underwent peritoneal dialysis for severe metabolic imbalance. In confirmation of earlier data, the BCKA/BCAA ratios in blood had been found to be fairly stable in this patient during long-term dietary therapy.

The child became comatose at comparatively low levels of leucine and KICA (ca. 2 mM each). At this time the blood/cerebrospinal fluid ratio for BCAA's and BCKA's was markedly diminished. During peritoneal dialysis, peritoneal clearance was highest for KIVA, but less for MEVA and BCAA's (40–50% or urea clearance), and least for the allegedly most toxic metabolite, KICA. The differences for BCKA's may be due to their differential protein binding. Given these individual differences, 1.8 to 8.7 initial plasma volumes were cleared in 14h with 24.21 of dialysis fluid. In the same time, urinary excretion of BCAA's and BCKA's was much less efficient.

The data are discussed with regard to the pathobiochemical significance of high tissue levels of branched chain acids. A quantitative comparison between peritoneal dialysis and exchange transfusion is not yet possible.

Key words

Maple syrup urine disease Peritoneal dialysis Peritoneal clearances Branched-chain α-amino acids Branched-chain α-keto acids 

Abbreviations

BCAA's

branched-chain α-amino acids

BCKA's

branched-chain α-keto acids

KICA

α-keto-isocaproic acid

KIVA

α-keto-isovalerio acid

MEVA

α-keto-β-methyl-n-valeric acid

MSUD

maple syrup urine disease

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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • U. Wendel
    • 1
  • K. Becker
    • 1
  • Hildegard Przyrembel
    • 1
  • Monika Bulla
    • 2
  • C. Manegold
    • 2
  • Angelika Mench-Hoinowski
    • 3
  • U. Langenbeck
    • 3
  1. 1.University Children's Hospital CDüsseldorfFederal Republic of Germany
  2. 2.University Children's HospitalKölnFederal Republic of Germany
  3. 3.Institute of Human GeneticsUniversity of GöttingenGöttingenFederal Republic of Germany

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