• Charmaine S Gray, Powell Colin V E CVE Emergency Department, Sidra Medical and Research Center, Doha, Qatar. Emergency Dep, Franz E Babl, Stuart R Dalziel, Simon Craig, and PREDICT (Paediatric Research In Emergency Departments International Collaborative) Research Network.
• Emergency Department, Women's and Children's Hospital, University of Adelaide, North Adelaide, South Australia, Australia.
• Emerg Med J. 2019 Apr 1; 36 (4): 225-230.

ObjectiveTo determine the variability of primary and secondary outcomes used in trials of intravenous bronchodilators in children with acute severe paediatric asthma.MethodsSystematic search of MEDLINE, EMBASE, Cochrane CENTRAL and the WHO International Clinical Trials Registry Platform for randomised trials in children (less than18 years) with acute severe paediatric asthma comparing intravenous bronchodilator therapy to another treatment. Initial search was performed on 7 January 2016 with an updated search performed on 6 September 2018. Primary and secondary outcomes were collated.ResultsWe identified 35 published papers and four registered study protocols. 56 primary outcomes were found, the most common being a clinical asthma score (23/56; 41%). Other identified primary outcomes included bedside tests of respiratory function (11/56; 20%) and measures of length of stay (9/56; 16%). There were a total of 60 different secondary outcomes, the most common were various length of stay measures (24/60; 40%) and adverse events (11/60; 18%).ConclusionStudies comparing intravenous treatment modalities for children with acute severe paediatric asthma exhibit great variation in the type, number and timing of outcome measures used. There are no patient or family-specific outcomes reported. There is a need to develop international consensus.Trial Registration NumberCRD42017055331.© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.

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