Table 2.

Suggested changes made by patient research partners and the expert panel regarding the design and content of the intervention.

Group	Platform design		Treatment content
	Identified suggestion	Modification	Identified suggestion	Modification
PRPsa	- Move the interview films - Include a chat function with the psychologist - Automatic message sent directly via email or SMS when something new is commented on in the portal	- Interview video content moved to introduction - Chat function considered but currently not implemented - Feature under construction, to be added	- Remove deadlines for homework tasks - Mandatory fear steps as opposed to only optional	- Replaced with recommended submission date instead - First cardiac-related fear step made mandatory, with 2 steps as optional
Expert panel	- Shorten interview video content - Add a follow-up video of patient interview - Visual representation of intervention progress - Captioning of videos	- Videos shortened - Video with patient with MINOCAb added to include an update posttreatment - Stepwise diagram created and added to each step - Text captions added to videos	- Include measurements every step/week of the treatment - Add sleep-related content - Give a clearer message about exercise and physical exertion - Exposure therapy content that focuses less on habituation	- GAD-2c and PHQ-2d questionnaire measurements added weekly - Addition of “things to think about” regarding sleep in step 4 - Short text added to clarify “mixed messages” around the benefits of exercise for those who can - The heart-related fear section slightly rewritten to be more in line with an inhibitory learning model of exposure [41]

^aPRPs: patient research partners.

^bMINOCA: myocardial infarction with nonobstructive coronary arteries.

^cGAD-2: 2-item Generalized Anxiety Disorder scale.

^dPHQ-2: 2-item Patient Health Questionnaire.