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This study looks back at medical records of 1500 adults hospitalized for acute myocarditis (heart muscle inflammation). The goal is to find out how often dangerous heart rhythms occur and what factors predict them. No new treatments are tested—researchers will use existing data t…

This observational study will follow 100 patients in Belgium who have received an extravascular implantable cardioverter-defibrillator (EV-ICD) as part of their routine care. Researchers will collect data from medical records on device performance, complications, and patient outc…