Identification of Genetic Basis of Atrioventricular Conduction Defects: From Congenital Forms to Degenerative Forms

Congenital atrioventricular block inclusion criteria: * Patients with idiopathic congenital atrioventricular block diagnosed before the age of 15 years. * Non-immune congenital atrioventricular block documented by a maternal serology (negative for anti-nuclear antibodies or anti Ro-SSA antibodies and anti La-SSB antibodies) * Written consent to participate to the study and written consent of both parents. * Parents of children with idiopathic congenital atrioventricular block. Congenital atrioventricular block exclusion criteria * Positive maternal serology * Patients or parents who are unable to sign or who refuse to sign an informed consent Progressive Cardiac Conduction Disease inclusion criteria * Patients with isolated cardiac conduction disorder with a normal morphology of the heart confirmed by echocardiography. * Relatives of patients with isolated cardiac conduction disorder * Written consent to participate to the study Progressive Cardiac Conduction Disease exclusion criteria * Patients with cardiac conduction disorder associated with a structural cardiopathy or due to an identified cause * Patients who are unable to sign or who refuse to sign an informed consent