Reddy, Keerthana

Abstract Background Adults with congenital heart disease (ACHD) frequently experience gaps in lifelong ACHD specialty care, leading to preventable complications, hospitalizations, and premature mortality. However, effective, scalable, accessible, and sustainable strategies to reduce these gaps are lacking. Digital health offers potential solutions but requires a rigorous scientific approach in its design to address the needs of the target population. Objective To describe the development of a theory-based, community co-designed digital health intervention to improve lifelong ACHD care. Methods We integrated theory-based behavioral frameworks, semi-structured qualitative interviews with patients and clinicians, and a community-engaged approach to develop a digital health intervention for ACHD. The primary behavioral target was completing an ACHD specialist appointment. We conducted Capability, Opportunity, Motivation, and Behavior (COM-B)-guided semi-structured interviews with ACHD patients and clinicians to identify barriers to specialized care amenable to a digital intervention and patient-centered goals for the digital tool. The community partners helped develop key intervention objectives, create a theory-driven framework, and specify how each intervention component targets specific COM-B barriers. Results We interviewed 54 participants (37 ACHD patients and 17 clinicians) and engaged 21 community partners representing 4 advocacy organizations. Design objectives emphasized addressing patient loneliness, ensuring accessibility and credibility, and enabling scalability while centering patient perspectives. Participants identified four priorities: providing credible resources, uplifting patient voices, customizing to patient needs, and centering positivity and joy. The digital tool, named by community partners as Empower My Congenital Heart (EMCH), was designed within the web- and mobile-based, Apple- and Android-compatible, Eureka Digital Research platform (University of California, San Francisco). Key intervention components included educational modules, peer support, appointment planning nudges, and a digital medical passport. The EMCH’s theory-driven framework specifies how each intervention component targets specific COM-B barriers to specialized ACHD care. Conclusions The theory-driven, community co-designed EMCH digital tool is a rapidly scalable approach to improve guideline-recommended specialized ACHD care. Future studies will evaluate the acceptability, feasibility, effectiveness, and implementation outcomes to provide insight into a novel tool to reduce preventable morbidity and mortality in ACHD. Trial Registration The National Clinical Trial number for this study is NCT06581484 .