CARDIS (Cardiac ARrest DIgital Support): study protocol for a randomised controlled trial of a web-based support intervention for cardiac arrest survivors

The CARDIS trial will investigate the use of more accessible and standardised follow-up pathways by complementing existing care structures, thereby enhancing equity in long-term recovery and quality-of-life without requiring additional healthcare resources. The process evaluation will provide data on adherence, social selection, and engagement, essential for future implementation.<b>Trial registration:</b> The trial is registered at clinicaltrials.gov (NCT07240714).