Using a digital health intervention “INTERCEPT” to improve secondary prevention in coronary heart disease (CHD) patients: protocol for a mixed methods non-randomised feasibility study

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Background Digital health interventions (DHIs) are increasingly used for the secondary prevention of cardiovascular disease (CVD). The aim of this study is to determine the feasibility of “INTERCEPT”, a co-designed DHI developed to improve secondary prevention in hospitalised coronary heart disease patients (CHD). Methods This non-randomised, pilot feasibility study with embedded process evaluation will be conducted with a sample of 40 patients in an acute hospital setting. Informed by behaviour change theory, INTERCEPT integrates a smartphone interface, health care professional portal, a fitness wearable and a blood pressure monitor. INTERCEPT is designed to support and motivate patients to set goals, self-monitor lifestyle and medical risk factors, and manage their medications, with the health care professional portal enabling monitoring and communication with patients. Using consecutive sampling, eligible patients will be recruited in two phases, a pre-implementation phase and an implementation phase. Commencing with pre-implementation (1 month duration), participants will not immediately receive INTERCEPT, however, they will be invited to receive INTERCEPT at 3 months follow-up. This will enable early learning about the processes of recruitment and conducting the assessment prior to full scale deployment of INTERCEPT in the next step implementation phase. During the implementation phase (2 months duration), participants will be invited to download INTERCEPT to their smartphone prior to hospital discharge. Qualitative interviews will be conducted among a subset of patients and health care professionals to gain a greater insight into their experience of using INTERCEPT. Primary outcomes will be assessed at baseline and 3-month follow-up. Using pre-defined feasibility criteria, including recruitment, retention and engagement rates, together with data on intervention acceptability, will determine the appropriateness of progressing to a definitive trial. Discussion This study will provide important insights to help inform the feasibility of conducting a definitive trial of “INTERCEPT” among coronary heart disease patients in a critical health care setting.

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