How and why digital information interventions support patients and carers during hospital-to-home transitions: a protocol for a realist systematic review.

introductionThe transition from hospital to home is a vulnerable stage in the patient pathway. Patients and carers often report unmet information needs regarding diagnoses, medication changes, follow-up arrangements and escalation pathways during the post-hospital discharge period. Digital information interventions-such as electronic health records, patient portals or remote communication systems-have been proposed to improve discharge pathways. However, evidence on their impact is unproven. The aim of this review is to understand what works for whom, how, why and in what circumstances in relation to digital information interventions during the hospital-to-home journey. METHODS AND ANALYSIS: Pawson's realist review approach will be used. The Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols and Realist and Meta-narrative Evidence Syntheses: Evolving Standards quality and reporting standards will also be followed. The review will follow five steps: (1) Development of the initial programme theory; (2) evidence search; (3) selection and appraisal of data; (4) extraction and organisation of data and (5) data synthesis and analysis. The search will be conducted in MEDLINE (Ovid); Embase; PsycINFO; Web of Science and Cochrane Library and supplemented with citation tracking, grey literature, relevant organisational websites, programme evaluation reports and through consultation with stakeholders. The realist review will be an iterative process, and the initial realist programme theory will be tested (confirmed, refuted or refined) in response to the data searches and stakeholder discussions. Patient and public involvement and engagement will be embedded throughout the review. Patients, carers and health and care stakeholders will contribute to refining the initial programme theory, interpreting emerging programme theory and co-developing dissemination outputs to ensure findings remain grounded in lived realities. ETHICS AND DISSEMINATION: Ethical approval is not required for this review as it involves secondary analysis of published literature. The review will be conducted in accordance with principles of research integrity, transparency and responsible stakeholder involvement. Findings will inform the co-design of future digital discharge interventions and contribute to national priorities around digital transformation, safety and equity in transitional care. Dissemination will include conference presentations, a peer-reviewed journal article and accessible summaries co-developed with stakeholders to support equitable implementation and impact.