Table 2.

Inclusion and exclusion criteria

Include if study involves

Exclude if study involves

Women Including cis and trans women Also include if sex/gender is not specified Adults aged 18 and older One or more of the following diagnoses: Heart disease Ischaemic heart disease Coronary heart disease Coronary artery disease Acute coronary syndrome Myocardial infarction Unstable angina MINOCA (myocardial infarction with non-obstructive coronary arteries) Spontaneous coronary artery dissection Microvascular coronary disease Coronary artery spasm Coronary embolism Kounis syndrome Congestive heart failure Cardiomyopathy HFrEF (heart failure with reduced ejection fraction) HFpEF Takotsubo syndrome Stroke or Cerebrovascular accident A support intervention led by a peer(s) Could be Individual (1:1) support or group programmes Virtual/online programmes The provision of emotional, appraisal and/or informational assistance

Men only Exclusively the following diagnoses (if none of the inclusion diagnoses on the left are also present): Peripheral arterial disease Peripheral vascular disease Heart valve diseases Stenosis Regurgitation/leaky valve Arrhythmias Atrial fibrillation Atrial flutter Supraventricular tachycardia Palpitations Hypertension Risk factors for cardiovascular disease (eg, physical inactivity or sedentary lifestyle, smoking, depression), but no diagnosis of a cardiovascular disease Support programmes led by healthcare professionals, and not peers with lived experience Informal social support from family, friends, or caregivers, and not peers with lived experience Systematic reviews and meta-analyses, scoping reviews (these types of studies should be flagged and documented in a group Google doc for reference) Descriptive or qualitative papers presenting general principles, frameworks, conceptual models or qualities of peer support, but that do not evaluate a peer support intervention(s), specifically (these types of studies might be useful to flag in our Google doc as reference papers)