User-Centered Development of HEARTPrep, a Digital Health Psychosocial Intervention for Prenatally Diagnosed Congenital Heart Disease.

User-centered models for the development of digital health interventions are not consistently applied in healthcare settings. This study used a five-phase, user-centered approach to develop HEARTPrep^©, a psychosocial intervention delivered via mobile app and telehealth to mothers expecting a baby with congenital heart disease (CHD) to promote maternal, family, and child well-being. Phases of intervention development were: (I) establishing partnerships; (II) creating content; (III) developing prototype and testable intervention; (IV) conducting think-aloud testing; and (V) completing beta testing. Partnerships with parents, clinicians, and design/technology experts were integral throughout the development of HEARTPrep^©. Parents of children with CHD also served as participants in Phases II-V, contributing to the creation of content and providing feedback to inform the iterative refinement of HEARTPrep^©. These five phases produced a refined digital health intervention with promising feasibility, usability, and acceptability results. This user-centered approach can be used to develop digital health interventions targeting various health outcomes.