• John Young, John Green, Amanda Farrin, Michelle Collinson, Suzanne Hartley, Jane Smith, Elizabeth Teale, Najma Siddiqi, and Sharon K Inouye.
• Academic Unit for Ageing and Stroke Research, University of Leeds, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK.
• Age Ageing. 2020 Jul 1; 49 (4): 640-647.

Objectiveto provide a preliminary estimate of the effectiveness of the prevention of delirium (POD) system of care in reducing incident delirium in acute hospital wards and gather data for a future definitive randomised controlled trial.Designcluster randomised and controlled feasibility trial.Settingsixteen acute care of older people and orthopaedic trauma wards in eight hospitals in England and Wales.Participantspatients 65 years and over admitted to participating wards during the trial period.Interventionsparticipating wards were randomly assigned to either the POD programme or usual care, determined by existing local policies and practices. The POD programme is a manualised multicomponent delirium prevention intervention that targets 10 risk factors for delirium. The intervention wards underwent a 6-month implementation period before trial recruitment commenced. Main outcome measure incidence of new-onset delirium measured using the Confusion Assessment Method (CAM) measured daily for up to 10 days post consent.Resultsout of 4449, 3274 patients admitted to the wards were eligible. In total, 714 patients consented (713 registered) to the trial, thirty-three participants (4.6%) withdrew. Adherence to the intervention was classified as at least medium for seven wards. Rates of new-onset delirium were lower than expected and did not differ between groups (24 (7.0%) of participants in the intervention group versus 33 (8.9%) in the control group; odds ratio (95% confidence interval) 0.68 (0.37-1.26); P = 0.2225).Conclusionsbased on these findings, a definitive trial is achievable and would need to recruit 5220 patients in 26 two-ward hospital clusters. Trial registration: ISRCTN01187372. Registered 13 March 2014.© The Author(s) 2020. Published by Oxford University Press on behalf of the British Geriatrics Society.

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