COVID-19 Vaccine-induced Inflammatory Heart Disease Prevalence Registry

The study will consist of two components. 1) The vaccine-induced inflammatory heart disease database will be established. There will be a retrospective chart review looking at vaccine myocarditis/pericarditis (Brighton Criteria Levels 1-3). 2\) There will be a prospective, pragmatic design case-control study for vaccine myocarditis/pericarditis. This will be a multi-center study conducted in centers in Canada that treat post-vaccine inflammatory heart disease in both the inpatient and outpatient settings. Patients will be invited to participate in the Registry when they present to the Emergency Department, during inpatient admission, or in the Cardiology Outpatient Clinic. Patients will be invited to ask a relative or friend to contact the research site to serve as controls. The retrospective component of the study will be conducted by identifying patients previously diagnosed with this condition at participating centers. At some centers, we will collect clinical information and include blood samples for biomarkers at the baseline/recruitment visit and first follow-up visit for cases and at a research study visit for controls. The follow-up visit is expected to be between 4 and 12 weeks after the initial visit. The UOHI will see the patients for clinical purposes and the research data will be captured at the same time points. These are expected at baseline/initial visit and then a 4-12-weeks follow-up visit. Clinical assessments and bloodwork will be conducted at the two visits. Subsequent follow-up via telephone interview will be conducted after 6 months, 12 months and every year for 4 years, with a script-based questionnaire to ascertain the patient's clinical status and the achievement of clinical endpoints. Patients will be asked to complete a quality-of-life questionnaire.