Clinical courses of three patients with immune-related myocarditis concomitant with complete AVB. (a, c, e) Cardiac biomarkers of three patients increased after developing myocarditis and gradually decreased with the initiation of therapy. (b, d, f) Doses of steroids over time and pacemaker implantation in three patients. TNTsh, high-sensitivity troponin T; NT-proBNP, n-terminal pro-brain natriuretic peptide; cTnI, cardiac troponin I; AVB, atrioventricular block; IVIG, intravenous immunoglobulin; and CPR, cardiopulmonary resuscitation.