Table 2 Diagnostic criteria for isolated non‐compaction of the myocardium.

1.	Absence of coexisting cardiac abnormalities (other than 2–4) by definition
2.	Typical two‐layered structure of the myocardium with a thin, compacted outer (epicardial) band and a much thicker, non‐compacted inner (endocardial) layer consisting of trabecular meshwork with deep endocardial spaces (the maximum end systolic ratio of the non‐compacted endocardial layer to the compacted myocardium of >2 is characteristic)
3.	Predominant segmental location of the abnormality (that is, non‐compacted myocardium is predominantly (>80%) found in the apical and mid‐ventricular areas of both the inferior and the lateral wall).
4.	Colour Doppler echocardiographic evidence of deeply perfused intertrabecular recesses (in contrast to myocardial sinusoids, intertrabecular spaces do not communicate with the coronary circulation)