When is an appropriate time to consider endomyocardial biopsy for non-ischemic cardiomyopathy?  

Endomyocardial biopsy is mostly indicated when there is a suspicion for acute myocarditis specially if related with arrhythmias at presentation to r/o giant cell myocarditis,  chemotherapy agents related cardiomyopathy specially a tracy clones and immune checkpoint inhibitors, restrictive disea...