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Identified aetiologies of AV block in patients <50 years (n = 1027). aAmyloidosis (n = 2), myocarditis (n = 2), severe right ventricular dilation (n = 2), cardiac tumour (n = 1), Kearn–Sayre syndrome (n = 1), rheumatic fever (n = 1), side-effect to radiation therapy (n = 1), and graft vs. host reaction (n = 1). AV, atrioventricular.
