Cardiomyopathy, Infantile Histiocytoid, also known as histiocytoid cardiomyopathy, is related to early myoclonic encephalopathy and mitochondrial disease. An important gene associated with Cardiomyopathy, Infantile Histiocytoid is MT-CYB (Mitochondrially Encoded Cytochrome B), and among its related pathways/superpathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.. Affiliated tissues include heart and cardiac myocytes, and related phenotypes are tachycardia and ventricular tachycardia