Table 8. – Risk stratification and likelihood of indication for endomyocardial biopsy based on cardiac magnetic resonance (CMR) parameters.

Prognostic risk	CMR parameter	Suggested approach	Indication for biopsy
Low	No changes in T1 and T2 No ventricular dysfunction	Clinical follow-up	No indication
Intermediate	Positive T1 or T2 Nonextensive late enhancement (<17 g and 13% of LV mass) Normal function or mild LV dysfunction	Clinical follow-up, repeat CMR at 1, 3, and 6 months	Stable: no indication Progressive dysfunction: possible indication
High	Positive T1 or T2 Extensive late gadolinium enhancement (>17 g or 13% of LV mass), or interventricular septal involvement, and/or moderate or severe LV dysfunction	Clinical follow-up, repeat CMR at 1, 3, and 6 months	Possible indication

LV: left ventricular.