We observed higher rates of hospital cardiac arrest (IHCA), and poorer outcomes at night. However, in those admitted to ICU, this variation was absent. This suggests patient factors and processes of care issues contribute to the variation in IHCA seen throughout the day.

We identified 115,690 eligible patients in the NCAA database.

Pulseless electrical activity was the commonest presenting rhythm (54.8%).

66,885 patients died in the immediate post resuscitation period.

Overall, hospital survival in the NCAA cohort was 21.3%.

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