Background: Most individuals with dementia in the UK die in care homes. 70% of these are residential, relying on external healthcare professionals to manage the complex needs. eHealth can help facilitate the delivery of holistic care in care homes, yet adoption has traditionally been faced with resistance. Innovative approaches employing Methods from implementation science are required to promote the uptake of eHealth in care homes.

Aim: To evaluate the feasibility of a theoretically-informed co-designed implementation plan for an eHealth intervention to support holistic assessment and decision making for people with dementia in care homes and their family carers, and to identify opportunities to strengthen it.

Methods: An embedded mixed-Methods study conducted in two residential care homes. Qualitative data comprised non-participant observations of the intervention in use, focus groups and semi-structured interviews with care home staff. Data was analysed using a codebook thematic analysis underpinned by the Normalistion Process Theory. Quantitative data included app usage data and two implementation measures, analysed using descriptive statistics. Patient and public involvement informed development and conduct of the study.

Results: 20 care home staff across two care homes used the intervention with 26 residents. Whilst there was some evidence of adoption, reach within the care home and feasibility of its implementation, usage data indicated that the intervention was largely not utilised as intended. Whilst there was sufficient coherence around the intervention, staff faced barriers related to collective action including workload and incompatibility with practice. Reflexive monitoring was therefore low as individuals could not appraise its impact, which compromised staff cognitive participation. Revisions to the plan related to strategies to provide further staff support, including encouraging family involvement and a more tailored approach to training.

Conclusions: Evaluating feasibility of the implementation plan of the intervention was a vital step in its development. Rapid evaluation and iterative response to barriers to use informed learning and allowed for real- time adjustments to implementation strategies, and a set of updated recommendations for use. Further collaboration on the revised strategies with people living with dementia and their family carers is required.