Table 1.

Process stages of the development of the intervention.

Step	Type	Content	Exercises	Attendees
Panel discussion	FGDa with patient research partners group	Open discussion, information gathering	None	2 researchers, 3 patient representatives
Panel discussion	FGD with patient research partners group	Open discussion, identification of problems	Asked to go through some questionnaires, including the CAQb	3 researchers, 3 patient representatives
Panel discussion	FGD with patient research partners group	Open discussion, thoughts and feedback of material, and ideas for iCBTc intervention	Were presented with a brochure	3 researchers, 3 patient representatives
Panel discussion	FGD with patient participatory group	Open discussion, some testing of relevant material, feedback used to gauge usefulness	Reviewed material from an existing online intervention, tested a homework exercise on fear after a cardiac event, reviewed a video interview with a cardiologist talking about MINOCAd	2 researchers, 2 patient representatives
Portal introduction	Phone call with patient representatives	Instructions/introduction to online portal	Logging in to the portal, testing of user account	N/Ae
Prototype 1	Online iCBT testing	Introduction and “Fear after MINOCA” content	Describe own experience of MINOCA	7 patient representatives invited, of which 6 logged in
Feedback	Telephone feedback interviews	Feedback via phone	N/A	6 patient representatives
Prototype 2	Online iCBT testing	Stressors and stress reactions	Listing own stressors and self-observation of stress reactions	6 patient representatives
Feedback	Telephone/mail feedback interviews	Feedback via phone	N/A	6 patient representatives
Prototype 3	Online iCBT testing	The importance of consequences, recovery, and relaxation	Trying alternative behaviors and relaxation exercises	6 patient representatives
Feedback	Telephone feedback interviews	Feedback via phone	N/A	6 patient representatives
Prototype 4	Online iCBT testing	Values	Formulating values and planning activities accordingly	6 patient representatives
Feedback	Telephone feedback interviews	Feedback via phone	N/A	6 patient representatives
Prototype 5	Online iCBT testing	Summary, evolution, and maintenance	Formulating a plan for relapse prevention and future development	4 patient representatives
PRPf panel meeting and interviews	Open-group interview with semistructured guide	Overall feedback on the intervention and the process of being part of a patient panel	N/A	2 researchers, 4 patient representatives
Expert panel meeting	Discussion of the intervention from the perspectives of psychologists and cardiologists with previous knowledge/experience	Current version of the intervention with all 9 steps and material	Going through content in own time, online and through the PDF handout version	2 researchers, 2 external psychologists, and 1 external cardiologist

^aFGD: focus group discussion.

^bCAQ: Cardiac Anxiety Questionnaire.

^CiCBT: internet-based cognitive behavioral therapy.

^dMINOCA: myocardial infarction with nonobstructive coronary arteries.

^eN/A: not applicable.

^fPRP: patient research partner.