RT Book, Section A1 Bissonnette, Bruno A1 Luginbuehl, Igor A1 Engelhardt, Thomas SR Print(0) ID 1164072961 T1 HHH Syndrome T2 Syndromes: Rapid Recognition and Perioperative Implications, 2e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781259861789 LK accesspediatrics.mhmedical.com/content.aspx?aid=1164072961 RD 2024/04/16 AB HHH is an acronym that stands for Hyperornithinemia-Hyperammonemia-Homocitrullinuria. Homocitrullinuria is a key feature of the HHH Syndrome. It is a genetically transmitted inborn error of metabolism caused by a defect in the transport of ornithine into the mitochondrial matrix characterized clinically by early growth retardation, learning disabilities, periodic confusion, and ataxia.