• Robert J Hoffman and Khalid Alansari.
• Sidra Medical and Research Center, Department of Emergency Medicine, PO Box 26999, Doha, Qatar.
• Am J Emerg Med. 2018 May 1; 36 (5): 754-757.

BackgroundThe potential for ondansetron to cause QT prolongation and fatal dysrhythmia is well-reported, including a 2011 FDA report on the topic. Few clinical trials evaluating this phenomenon in the ED setting exist, and only one is pediatric.ObjectiveWe have sought to determine the effect of a standardized dose of intravenous ondansetron on the QTc duration of children under 14years of age treated for gastroenteritis-associated vomiting in a pediatric ED. This study is modeled closely after an FDA "thorough QT study".MethodsEGCs were obtained before and 15, 30, 45, and 60min after a 0.15mg/kg IV dose of ondansetron given for gastroenteritis-associated vomiting. QT intervals were measured manually with digital calipers, and the QTc interval calculated both by Bazett's (QTcB) and Fridericia's (QTcF) correction. A paired t-test comparing QTc was conducted, and frequency of categorical outcomes of prolongation>30msec, >60 msec, and absolute prolongation >450 msec, >480 msec, and >500msec were evaluated.ResultsIn a 4-month period, 134 patients were included in the study, 46% were male. The average QTc prior to ondansetron administration was: QTcB 415 msec (95% CI 343-565) and QTcF 373 (95% CI 304-499). The mean difference in QTc after ondansetron was 0.4msec for QTcB (95% CI -35-45msec) and 0.1msec for QTcF (95% CI -40-18msec).ConclusionIn these children, 0.15mg/kg of intravenous ondansetron did not cause prolongation of QTcB or QTcF measured 15min after administration, nor at later times.Copyright © 2017 Elsevier Inc. All rights reserved.

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