Table 1.

Diagnostic criteria used to define noncompaction cardiomyopathy

Echocardiographic criteria
Jenni et al. 13	A two‐layer structure with a thin, compacted layer (C) and a thickened non‐compacted layer (NC) at end‐systole	A ratio of NC/C > 2	Intertrabecular spaces are filled by blood flow on colour Doppler
Chin et al. 16	Distance from the epicardial surface to the trough of the trabecular recess (X) and distance from the epicardial surface to peak of trabeculation (Y) at end‐diastole	A ratio of X/Y ≤ 0.5	Focus on the trabeculations at the LV apex
Stöllberger et al. 17	≥3 trabeculations along the LV endocardial borders, different from the papillary muscles, false tendons, and aberrant muscle bands	Trabeculations with the same echogenicity as the myocardium and synchronous movement with ventricular contractions	Perfusion of the intertrabecular recesses from the LV cavity
Paterick et al. 18	Identification of the bilayered myocardium in the short‐axis views at the middle and apical levels	A ratio of NC/C > 2, measured at end‐diastole on short‐axis parasternal views

MRI criteria
Petersen et al. 14	A ratio of NC/C > 2.3 measured at end‐diastole
Jacquier et al. 15	Trabeculated LV mass > 20% of global LV mass
Grothoff et al. 19	Percentage of LV trabeculation > 25% and trabeculated LV mass > 15 g/m2	A ratio of NC/C ≥ 2 in segments 4–6	A ratio of NC/C ≥ 3 in at least one of the other segments

C, compacted; LV, left ventricular; MRI, magnetic resonance imaging; NC, non‐compacted.