1. Blood ammonia and glutamine as predictors of hyperammonemic crises in patients with urea cycle disorder
- Author
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Lee, Brendan, Diaz, George A, Rhead, William, Lichter-Konecki, Uta, Feigenbaum, Annette, Berry, Susan A, Le Mons, Cindy, Bartley, James A, Longo, Nicola, Nagamani, Sandesh C, Berquist, William, Gallagher, Renata, Bartholomew, Dennis, Harding, Cary O, Korson, Mark S, McCandless, Shawn E, Smith, Wendy, Cederbaum, Stephen, Wong, Derek, Merritt, J Lawrence, Schulze, Andreas, Vockley, Gerard, Kronn, David, Zori, Roberto, Summar, Marshall, Milikien, Douglas A, Marino, Miguel, Coakley, Dion F, Mokhtarani, Masoud, and Scharschmidt, Bruce F
- Subjects
Clinical Research ,Adolescent ,Adult ,Ammonia ,Child ,Child ,Preschool ,Female ,Glutamine ,Humans ,Hyperammonemia ,Infant ,Male ,Middle Aged ,Predictive Value of Tests ,Urea Cycle Disorders ,Inborn ,Young Adult ,glycerol phenylbutyrate ,hyperammonemia ,RAVICTI ,sodium phenylbutyrate ,UCD Consortium ,Genetics ,Clinical Sciences ,Genetics & Heredity - Abstract
PurposeThe aim of this study was to examine predictors of ammonia exposure and hyperammonemic crises in patients with urea cycle disorders.MethodsThe relationships between fasting ammonia, daily ammonia exposure, and hyperammonemic crises were analyzed in >100 patients with urea cycle disorders.ResultsFasting ammonia correlated strongly with daily ammonia exposure (r = 0.764; P < 0.001). For patients with fasting ammonia concentrations 200% (P < 0.0001), respectively. The relationship between ammonia and hyperammonemic crisis risk seemed to be independent of treatment, age, urea cycle disorder subtype, dietary protein intake, or blood urea nitrogen. Fasting glutamine correlated weakly with daily ammonia exposure assessed as 24-hour area under the curve and was not a significant predictor of hyperammonemic crisis.ConclusionFasting ammonia correlates strongly and positively with daily ammonia exposure and with the risk and rate of hyperammonemic crises, suggesting that patients with urea cycle disorder may benefit from tight ammonia control.
- Published
- 2015