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Carbamoyl phosphate synthetase I deficiency (CPS I deficiency) [1] is an autosomal recessive metabolic disorder that causes ammonia to accumulate in the blood due to a lack of the enzyme carbamoyl phosphate synthetase I. Ammonia, which is formed when proteins are broken down in the body, is toxic if the levels become too high.
The underlying mechanism is believed to involve the buildup of ammonia in the blood, a substance that is normally removed by the liver. [2] The diagnosis is typically based on symptoms after ruling out other potential causes. [2] [6] It may be supported by blood ammonia levels, an electroencephalogram, or computer tomography (CT scan) of the ...
This biochemical phenotype (increased ammonia, low citrulline and increased orotic acid) is classic for OTC deficiency, but can also be seen in neonatal presentations of ornithine aminotransferase deficiency. [4] Only severely affected males consistently demonstrate this classic biochemical phenotype. [citation needed]
Adenosine production and lack of ammonia overproduction seem to strongly suppress rhabdomyolysis down to the purine nucleotide energy charge level, where the cell is able to signal pain, or where individual muscle fibers start cramping (fail to relax from contraction in sync with the rest of the muscle), or the whole muscle fails to contract ...
Ornithine translocase deficiency, also called hyperornithinemia-hyperammonemia-homocitrullinuria (HHH) syndrome, [1] is a rare autosomal recessive [2] urea cycle disorder affecting the enzyme ornithine translocase, which causes ammonia to accumulate in the blood, a condition called hyperammonemia.
Hyperammonemia, or high ammonia levels, is a metabolic disturbance characterised by an excess of ammonia in the blood. Severe hyperammonemia is a dangerous condition that may lead to brain injury and death. It may be primary or secondary. Ammonia is a substance that contains nitrogen. It is a product of the catabolism of protein.
Ammonia is normally metabolized by the liver; as cirrhosis causes both decreased liver function and increased portosystemic shunting (allowing blood to bypass the liver), systemic ammonia levels gradually rise and lead to encephalopathy. [137] Most pharmaceutical approaches to treating hepatic encephalopathy focus on reducing ammonia levels. [138]
Protein toxicity is the effect of the buildup of protein metabolic waste compounds, like urea, uric acid, ammonia, and creatinine.Protein toxicity has many causes, including urea cycle disorders, genetic mutations, excessive protein intake, and insufficient kidney function, such as chronic kidney disease and acute kidney injury.