Endocardial Fibroelastosis, also known as endomyocardial fibroelastosis, is related to barth syndrome and hypoplastic left heart syndrome. An important gene associated with Endocardial Fibroelastosis is TAFAZZIN (Tafazzin, Phospholipid-Lysophospholipid Transacylase), and among its related pathways/superpathways are Cardiac conduction and 22q11.2 copy number variation syndrome. Affiliated tissues include heart and lung, and related phenotypes are cognitive impairment and hypoglycemia