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[Uremia after hemorrhages in the upper digestive tract]
C H Dejong1, S W Olde Damink, N E Deutz
1Academisch Ziekenhuis, afd. Algemene Heelkunde, Maastricht.
Nederlands Tijdschrift Voor Geneeskunde
|February 24, 1999
Summary
Upper gastrointestinal bleeding can cause severe urea and ammonia buildup. Supplementing the essential amino acid isoleucine prevented this in pigs, suggesting it may help patients with GI bleeding.
Area of Science:
- Biochemistry
- Gastroenterology
- Metabolic Disorders
Context:
- Upper gastrointestinal (GI) bleeding is a significant clinical issue.
- The precise mechanisms leading to severe uraemia and hyperammonaemia post-GI hemorrhage remain unclear.
- Previous observations noted decreased arterial isoleucine levels following intragastric blood administration in pigs.
Purpose:
- To investigate the role of the essential amino acid isoleucine in the development of uraemia and hyperammonaemia after gastrointestinal bleeding.
- To test the hypothesis that the absence of isoleucine in blood protein contributes to these metabolic disturbances.
- To evaluate the therapeutic potential of isoleucine administration in preventing these conditions.
Summary:
- Intragastric blood administration in pigs led to decreased arterial isoleucine levels, elevated ammonia and urea, and uraemia.
- Blood protein analysis revealed a complete absence of isoleucine, indicating low biological value.
- Simultaneous intravenous isoleucine administration prevented uraemia in pigs, supporting a causal link between isoleucine deficiency and GI bleeding complications.
- Similar effects were observed in human patients with both normal and impaired liver function.
Impact:
- The findings suggest that isoleucine deficiency following GI hemorrhage contributes to uraemia and hyperammonaemia.
- This deficiency may impair protein synthesis, exacerbating metabolic derangements.
- Intravenous isoleucine supplementation presents a potential therapeutic strategy for patients experiencing GI bleeding.