Objectives: Describe clinical characteristics, treatment and outcomes of children treated for life-threatening pertussis in paediatric intensive care units during the 2023-2024 outbreak in Great Britain.
Design: National multi-centre audit.
Setting: All paediatric intensive care units (PICUs) in Great Britain.
Patients: Between November 2023 and June 2024, 54 children with a proven diagnosis of Bordetella pertussis as the primary reason for intensive care admission requiring invasive ventilation.
Interventions: None.
Main outcome measures: Mortality on PICU, length of stay and number of invasive ventilation days.
Results: Median admission age 43 days, with peak blood white cell count (WCC) from 6×109/L to 149×109/L. 23% of infants' mothers were vaccinated during pregnancy (national average 59%). Mortality was 11/54 (20%), with 10 in infants <3 months. The survivor with the highest WCC peaked at 82×109/L prior to exchange transfusion (XT), and the highest peak WCC in a survivor without XT was 71×109/L. Eighteen patients underwent 27 XTs for leucoreduction, initiated at median peak WCC of 54×109/L (range 32-148). All who died had XT planned, with nine completing. None with a peak WCC of <51×109/L died, although four patients underwent XTs. In patients with rising WCC, survivors' rise rate was lower than those who died (0.23×109/L/hour vs 1.4×109/L/hour).
Conclusions: In children invasively ventilated due to Bordetella pertussis, higher peak WCC, rapid WCC rise and a primary admission reason other than apnoeas are associated with mortality. XTs can be avoided in WCC <50×109/L. Maternal vaccination rate was lower in this cohort than the general population.
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