title: Comparison of subcutaneous and intravenous administration of a solution of amino acids in older patients.
abstract: OBJECTIVE
  To compare the plasma amino acid (AA) concentrations obtained by the infusion of an AA solution (660 mOsm/L, pH 7) using the subcutaneous (SC) with that using the intravenous (i.v.) route in older patients.
  
  
  METHODS
  A prospective, randomized, cross-over study.
  
  
  METHODS
  A hospital geriatric ward.
  
  
  METHODS
  Six patients with a mean age of 84 years.
  
  
  METHODS
  The infusion of the AA solution (IV or SC) lasted 6 hours. Blood was sampled at 0, 2, 4, 6, 8, 10, 14, 18, and 24 hours from the start of the infusion to determine plasma AA level by the phenyl-isothiocyanate method.
  
  
  RESULTS
  Compared with baseline values, plasma AA concentrations increased to a significantly higher level from the second to the tenth hour and from the second to the fourteenth hour during i.v. and SC infusions, respectively. Plasma AA levels did not differ between the two routes. SC infusion was well tolerated.
  
  
  CONCLUSIONS
  Assuming that nutritional sufficiency is the desired result of plasma AA infusion, we conclude the SC route is well tolerated and offers the possibility of nitrogen supplementation for older patients over short periods of time, when oral protein intake is transiently insufficient or impossible, as a way to limit, but not to treat, protein-energy malnutrition.
authors.affiliation: Service de Gériatrie, Centre Hospitalier de Valence, France.
authors.forename: M
authors.initials: M
authors.lastname: Ferry
authors.forename: X
authors.initials: X
authors.lastname: Leverve
authors.forename: T
authors.initials: T
authors.lastname: Constans
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000596:Amino Acids / Q000008:administration & dosage* / Q000097:blood; D018592:Cross-Over Studies; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D007279:Injections, Subcutaneous; D008297:Male; D018529:Nutritional Support; D011446:Prospective Studies; D011502:Protein-Energy Malnutrition / Q000628:therapy; D012996:Solutions
chemical_list: D000596:Amino Acids; D012996:Solutions