Electronic Cardiac Rehabilitation (eCardiacRehab) Feasibility Study

Based on previous studies, the success criteria will be one login to the website on average once per week, and that 50% of participants will watch some or all the video messages on the website. Usage will be assessed as time spent using the programme, number of logins with start and end time, summary of number of sessions, messages sent, modules completed, and registrations per patient, number of completed questionnaires per patient, and start and end time for all modules in the programme. This will be assessed based on website usage statistics gathered by a website visit tracking system. Further, participants will be asked to report login-errors.

Acceptability of the secondary and primary outcomes is assessed through response and completion rates. The proportion of missing data in each completed questionnaire at baseline and at the end of the intervention of less than 20% is acceptable.

A success criterion to reduce the threats to validity is an attrition rate of no more than 20%. When possible, the reasons for participants leaving the study are obtained and reported in a study log.

Composite end-point of Emergency Department (ED) contact and home, ED and observation, ED and admission (>24 hours), and death, whichever comes first.

The Beliefs about Medicines Questionnaire (BMQ) assesses beliefs and perceptions about medicines and treatment. The BMQ comprises two sections: the BMQ-Specific which assesses representations of medication prescribed for personal use and the BMQ-General which assesses beliefs about medicines in general. The two sections of the BMQ can be used in combination or separately. For this study, the BMQ-Specific will be used. Respondents rate 11 items on a 5-point scale ranging from 1 (strongly agree) to 5 (strongly disagree).

The Heart Continuity of Care Questionnaire (HCCQ) comprises 33 items covering eight topic areas regarding continuity of care. Respondents rate each item on a 6-point scale ranging from 1 (strongly disagree) to 5 (strongly agree) or 6 (not applicable).

The Health literacy questionnaire (HLQ) has nine scale scores that each measure an aspect of the multidimensional construct of health literacy. Each score provides insight into the strengths and limitations of the respondent, but the scores are most powerful when viewed together to show the 'health literacy profile' of the respondent

The Hospital Anxiety and Depression Scale (HADS). The HADS is a fourteen item scale where seven of the items relate to anxiety and seven relate to depression. The respondent rates each item on a 4-point scale ranging from 0 (absence) to 3 (extreme presence). The total score is 42 (21 per subscale).

Maximal oxygen consumption (VO2max) as measured by cardiopulmonary exercise testing (CPET).

Healthcare utilization will be assessed during follow-up, including patients' use of primary care services (general practitioner visits) and secondary care services (inpatient admissions and outpatient visits). The data source will be nationwide registries. The measurement unit will be mean number of visits.

Health care (associated) costs will be valued using the tariffs of national agreements between the professional associations of medical specialists and the National Health Services. In secondary care, inpatient admissions and outpatient visits will be valued using the tariffs of the national case-mix system of the diagnosis-related groupings (DRG) and the ambulatory grouping system (DAGS). In addition, data will be collected on prescription of medication, which will be valued using the retail price. The data source will be nationwide registries. The measurement unit will be mean costs in Euros.

The Myocardial Infarction Dimensional Assessment Scale (MIDAS) is a PRO measure developed and validated to specifically measure the health status of individuals who have suffered a myocardial infarction. It consist of 7 domains, and is a 35 item scale where respondents rate each item on a 5-point scale ranging from 1 (never) to 5 (always). The function of the MIDAS is to indicate the extent of ill health in each of the seven domains assessed, therefore each dimension is scored separately using a simple scoring methodology.

A visual analog scale ranging from 0 (fatigue is not a problem) to 10 (fatigue is a major problem) is used to measure change in fatigue.

The eHealth Literacy Scale (Eheals) is an 8-item measure of eHealth literacy developed to measure consumers' combined knowledge, comfort, and perceived skills at finding, evaluating, and applying electronic health information to health problems. Respondents indicate their agreement with statements on a 5-point Likert scale ranging from 1 (Strongly Disagree) to 5 (Strongly agree).

Data related to consumption of prescribed medication are identified through national prescription registries. The registries cover all prescriptions dispensed at pharmacies nationwide. The registries also include information about date of dispensation, quantity and strength dispensed. This will serve as complimentary information to patients' self-reported adherence.

The my experience of taking medicines (MYMEDS) questionnaire consists of six sections. Section 1: essential contextual information (e.g. the medicines taken). Section 2: overall understanding and satisfaction with medicines (four-point Likert scale (strongly agree, agree, disagree, strongly disagree)). Section 3: areas of anxiety about medicines (e.g. worry that they will cause more harm than good). Section 4: four separate practical concerns associated with medicines taking (e.g. swallowing problems). Section 5: assesses three issues in fitting medicines into patients' daily routine (e.g. relating to forgetfulness or inconvenience). Section 6: asks about adherence to each individual medicine over the past month (five point Likert scale). .

RAND-12 measures physical and mental dimensions of health. The 12 items in the questionnaire correspond to eight principal physical and mental health domains. The 12 items are summarized into two scores, a "Physical Health Summary Measure (PCS-physical component score)" and a "Mental Health Summary Measure (MCS-mental component score)".

The HeartQoL questionnaire is a core ischemic heart disease specific health related quality of life (HRQL) questionnaire. The questionnaire comprises 14-items with 10-item physical and 4-item emotional subscales which are scored from 0 (poor HRQL) to 3 (better HRQL) with a global score if needed.

The Seattle Angina Questionnaire (SAQ-7) comprises 7 dimensions of coronary artery disease. Each scale is transformed to a score of 0 to 100, where higher scores indicate better function (eg, less physical limitation, less angina, and better quality of life).

EQ-5D-5L is an 5 item (plus a VAS scale) self-report-questionnaire assessing self-reported health. Each question has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.

Responses to the Digital Health Readiness Questionnaire (DHRQ) are scored on a 5-point Likert scale (strongly disagree to strongly agree). The sum of the first 4 domains gives the total score on the DHRQ. The minimum score of the DHRQ is 15, and the maximum score of the DHRQ is 75. Additionally, a fifth domain called digital learnability is assessed.

The Minimal Insomnia Symptom Scale (MISS) comprises 3 items assessing major features of insomnia, i.e. difficulties initiating sleep, waking at night and not feeling refreshed by sleep.

The Sleep Sufficient Index (SSI) comprises 2 items assessing amount of actual and desired sleep.

Serum levels of cardiac medications (quantified using liquid chromatography with mass spectrometry)

HbA1c (≤7.0%), lipids, cardiac and inflammation markers(e.g. troponins, natriuretic peptides and CRP).

Blood pressure targets (<120/70 mmHg at nurse visit; <120/70 mmHg at home measurement)

BMI (WHO- classification), visceral fat, muscle mass, body fat.

Self-reported change in nicotine status

The the physical activity frequency, intensity, and duration (PAFID) questionnaire contains three items on physical activity: (i) frequency [never (0), less than once per week (0.5), once per week (1), 2-3 times per week (2.5), or almost every day (5)]; (ii) duration of each exercise session [<15 min (7.5), 15-29 min (22.5), 30-60 min (45), or over 60 min (75)]; and (iii) intensity [low ('I take it easy, I don't get out of breath or break a sweat'), moderate ('I push myself until I'm out of breath or break into a sweat'), or high ('I practically exhaust myself')]. The number of minutes of physical activity is calculated as the average time spent per session multiplied by the average frequency of exercise per week multiplied by the weighted intensity [low (0.5), moderate (1), and high (2)] based on the values in brackets.

Biosensor data is collected throughout the 12-week program, and include time spent sedentary and in light-, moderate- and vigorous-intensity physical activity, daily step count, resting/maximal heart rate, sleep time and quality and time and duration of wearing the wearable device.