Aminosyn HF 8
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Aminosyn HF 8%
Aminosyn-HF 8% (amino acid injection 8%) provides a mixture of essential and nonessential amino acids with high concentrations of the branched chain amino acids (isoleucine, leucine, and valine) and low concentrations of methionine and the aromatic amino acids (phenylalanine and tryptophan) relative to general purpose amino acid injections. This amino acid composition has been specifically formulated to provide a well tolerated nitrogen source for nutritional support and therapy of patients with liver disease who have hepatic encephalopathy.
The precise mechanisms which produce the therapeutic effects of Aminosyn-HF 8% are not known. The etiopathology of hepatic encephalopathy is also unknown and is thought to be of multifactorial origin. The rationale for Aminosyn-HF 8% is based on observations of plasma amino acid imbalances in patients with liver disease and on theories which postulate that these abnormal patterns are causally related to the development of hepatic encephalopathy.
Clinical studies in patients with hepatic encephalopathy showed that infusion of a solution identical to Aminosyn-HF 8% reversed the abnormal plasma amino acid pattern characterized by decreased levels of branched chain amino acids and elevated levels of aromatic amino acids and methionine. The trend toward normalization of these amino acids was generally associated with an improvement in mental status and EEG patterns. This clinical response was observed in the majority of patients studied. Nitrogen balance was significantly improved and mortality reduced in these typically protein-intolerant patients who received substantial amounts of protein equivalent from the amino acid solution.
When infused with hypertonic dextrose as a calorie source, supplemented with electrolytes, vitamins, and minerals, Aminosyn-HF 8% provides total parenteral nutrition in patients with liver disease, with the exception of essential fatty acids.
Phosphate is a major intracellular anion which participates in providing energy for metabolism of substrates and contributes to significant metabolic and enzymatic reactions in all organs and tissues. It exerts a modifying influence on calcium levels, a buffering effect on acid-base equilibrium, and has a primary role in the renal excretion of hydrogen ions.
It is thought that the acetate from lysine acetate and acetic acid, under the conditions of parenteral nutrition, does not impact net acid-base balance when renal and respiratory functions are normal. Clinical evidence seems to support this thinking; however, confirmatory experimental evidence is not available.
Last reviewed on RxList: 1/13/2009
This monograph has been modified to include the generic and brand name in many instances.
Additional Aminosyn HF 8% Information
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