Table 1.

Inclusion and exclusion criteria

Inclusion	Exclusion
Population: Adult patients admitted to the ICU or HDU and/or their families AND/OR palliative care professionals or teams	Studies solely considering children and adolescents (defined as those aged ≤ 18)
Intervention: Palliative care intervention occurring in/in relation to the ICU
Comparator: No palliative care intervention or, to include studies that compare separate palliative care interventions; alternative palliative care intervention(s)
Outcomes: Any of the following implementation outcomes; acceptability, adoption, appropriateness, costs, feasibility, fidelity, penetration, sustainability AND/OR any system/content/clinical/patient and family related palliative care outcomes	Studies with no reported outcomes Studies with no information of implementation
Study design: Controlled trials (randomised and non-randomised including observational studies). Process evaluations (quantitative, qualitative or mixed-methods), conducted either alongside a comparative study or stand-alone	Case reports or series Editorials/commentaries Opinion papers Publications only as abstracts Review papers
Dates: All dates
Language: Not limited to language or location