• Kieren P Fahey, Ben Gelbart, Felix Oberender, Jenny Thompson, Tom Rozen, Christopher James, Catriona McLaren, Jonathan Sniderman, and Wonie Uahwatanasakul.
• Paediatric Intensive Care Unit, Royal Children's Hospital Melbourne, Melbourne, VIC, Australia.
• Crit Care Resusc. 2021 Sep 6; 23 (3): 292299292-299.

AbstractObjective: To investigate the rate of interhospital emergency transport for bronchiolitis and intensive care admission following the introduction of high flow nasal cannula and standardised paediatric observation and response charts. Design: Retrospective cohort study. Setting: A statewide paediatric intensive care transport service and its two referral paediatric intensive care units (PICUs) in Victoria, Australia. Participants: Children less than 2 years old emergently transported with bronchiolitis during two time periods: 2008-2012 and 2015-2019. Main outcome measures: Incidence rates of bronchiolitis transport episodes, PICU admissions and respiratory support. Results: 802 children with bronchiolitis were transported during the study period, 233 in the first period (2008-2012) and 569 in the second period (2015-2019). The rate of interhospital transport for bronchiolitis increased from 32.9 to 71.8 per 100 000 children aged 0-2 years. The population-adjusted rate of PICU admission increased from 16.2 to 36.6 per 100 000 children aged 0-2 years. Metropolitan hospitals were the predominant referral source and this increased from 60.1% of transports to 78.6% (P < 0.001). In children admitted to a PICU, the administration of high flow nasal cannula during transport increased significantly from 1.7% to 75.9% (P < 0.001) and a concomitant reduction in continuous positive airway pressure and mechanical ventilation occurred (40-12.4% and 27-6.9% respectively; P < 0.001). The proportion of mechanical ventilation as well as PICU and hospital length of stay decreased over time. Conclusions: The population-adjusted rate of interhospital transport and admission to the PICU for bronchiolitis increased over time. This occurred despite a lower rate of non-invasive and invasive mechanical ventilation during transport and in the PICU.© 2021 College of Intensive Care Medicine of Australia and New Zealand.

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