• Anna Bryans, Najma Siddiqi, Lisa Burry, Mike Clarke, Jonathan Koffman, Meera R Agar, and Louise Rose.
• Department of Health Sciences (A.B.), University of York, York, UK.
• J Pain Symptom Manage. 2023 Oct 1; 66 (4): 293300.e8293-300.e8.

ContextDelirium is a serious neurocognitive syndrome which is highly prevalent in people approaching the end of life. Existing trials of interventions to prevent or treat delirium in adults receiving palliative care report heterogeneous outcomes.ObjectivesTo undertake an international consensus process to develop a core outcome set for trials of interventions, designed to prevent and/or treat delirium, for adults receiving palliative care.MethodsThe core outcome set development process included a systematic review, qualitative interviews, modified Delphi method and virtual consensus meetings using nominal group technique (Registration http://www.comet-initiative.org/studies/details/796). Participants included family members, clinicians, and researchers with experience of delirium in palliative care.ResultsForty outcomes were generated from the systematic review and interviews informing the Delphi Round one survey. The international Delphi panel comprised 92 participants including clinicians (n = 71, 77%), researchers (n = 13, 14%), and family members (n = 8, 9%). Delphi Round two was completed by 77 (84%) participants from Round one. Following the consensus meetings, four outcomes were selected for the core outcome set: 1) delirium occurrence (incidence and prevalence); 2) duration of delirium until resolution defined as either no further delirium in this episode of care or death; 3) overall delirium symptom profile (agitation, delusions or hallucinations, delirium symptoms and delirium severity); 4) distress due to delirium (person with delirium, and/or family and/or carers [including healthcare professionals]).ConclusionUsing a rigorous consensus process, we developed a core outcome set comprising four delirium-specific outcomes for inclusion in future trials of interventions to prevent and/or treat delirium in palliative care.Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

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