Timing for endomyocardial biopsy throughout fulminant myocarditis management. ANM, acute necrotizing myocarditis; Cath-lab, catheterization laboratory; CMR, cardiac magnetic resonance; ECLS, extracorporeal life support; EMB, endomyocardial biopsy; GCM, giant cell myocarditis; GDHF, guideline-directed heart failure; HTx, heart transplant; LVMU, left ventricle mechanical unloading; MCS, mechanical circulatory support; RVAD, right ventricular assisted device; SCAI, Society for Cardiovascular Angiography & Interventions.