Barth Syndrome, also known as 3-methylglutaconic aciduria type 2, is related to endocardial fibroelastosis and myopathy, and has symptoms including fatigue and proximal weakness. An important gene associated with Barth Syndrome is TAFAZZIN (Tafazzin, Phospholipid-Lysophospholipid Transacylase). The drug Pyruvate has been mentioned in the context of this disorder. Affiliated tissues include heart and skeletal muscle, and related phenotypes are dilated cardiomyopathy and abnormality of neutrophils