• Cristina Del Río, Elena Martín-Hernández, Alicia Ruiz, Pilar Quijada-Fraile, and Paloma Rubio.
• Department of Pediatric Anesthesiology, University Hospital 12 de Octubre, Madrid, Spain.
• Paediatr Anaesth. 2020 Jul 1; 30 (7): 780-791.

BackgroundUrea cycle disorders are congenital metabolism errors that affect ammonia elimination. Clinical signs and prognosis are strongly influenced by peak ammonia levels. Numerous triggers associated with metabolic decompensation have been described with many of them, including fasting or stress, being related to the perioperative period.AimsWe aimed to assess perioperative complications in pediatric patients with urea cycle disorders requiring general anesthesia in our center.MethodsWe reviewed the clinical history of all the pediatric patients with a confirmed urea cycle disorders diagnosis requiring surgery or a diagnostic procedure with anesthesia between January 2002 and June 2018.ResultsWe included 33 operations (major surgery, minor surgery, and diagnostic procedures) carried out on 10 patients via different anesthetic techniques. We observed the following complications: intraoperative hyperglycemia in one case, postoperative vomiting in eight cases, and slightly increased postoperative ammonia levels (54, 59, and 69 µmol/L) with normal preoperative levels in three cases without associated metabolic decompensation. There were two cases of perioperative hyperammonemia (72 and 69 µmol/L) secondary to preoperative metabolic decompensation (137 and 92 µmol/L) with the levels progressively dropping and normalizing in the first 24-48 hours, respectively.ConclusionsProcedures under anesthesia on pediatric patients with urea cycle diseases should be performed by experienced multidisciplinary teams at specialized centers. Perioperative management focused on avoiding catabolism (especially during fasting) and monitoring signs associated with metabolic decompensation to allow for its early treatment should be included in routine anesthetic techniques for children with urea cycle disorders.© 2020 John Wiley & Sons Ltd.

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