Effects of a Web-based Support Programme for Cardiac Arrest Survivors

The overall goal of this clinical trial is to learn if a web-based support programme can improve wellbeing in cardiac arrest survivors by helping them manage emotional, cognitive, and physical challenges. The study also explores how the programme is used and experienced in practice. The main questions it aims to answer are: * Can access to a web-based support programme improve overall wellbeing in cardiac arrest survivors? * Can it also enhance quality of life, cognitive function, life satisfaction, and sleep, while reducing anxiety, depression, post-traumatic stress, and fatigue? Researchers will compare cardiac arrest survivors who receive a web-based support programme in addition to standard care with those who receive standard care alone, to see if the programme improves wellbeing and other health outcomes. After the study, the control group will also gain access to the programme. Participants will: * Be asked to complete online questionnaires at three time points: at the start of the study, after 3 months, and after 6 months. * Be encouraged to use a web-based support programme for 3 months, with unlimited access, at their own pace and according to their individual needs (intervention group only).