Progressive Familial Heart Block, also known as hereditary bundle branch system defect, is related to progressive familial heart block, type ia and left bundle branch hemiblock, and has symptoms including dyspnea and syncopal episode. An important gene associated with Progressive Familial Heart Block is TRPM4 (Transient Receptor Potential Cation Channel Subfamily M Member 4), and among its related pathways/superpathways are Cardiac conduction and Neuroscience. The drugs Prednisolone and Prednisolone acetate have been mentioned in the context of this disorder. Affiliated tissues include heart and atrioventricular node, and related phenotypes are Decreased shRNA abundance and muscle