Inclusion Criteria:  For cases:  Arrhythmogenic right ventricular dysplasia diagnosed (according to 2010 Task Force Criteria) Admitted for right ventricle electrophysiologic mapping For controls * Admitted for ablation procedures (accessory pathway, atrial flutter) on otherwise healthy hearts.  Exclusion Criteria:  Diagnostic of systemic chronic inflammatory disease Presence of possible or proven cardiac involvement of an inflammatory disease, an acute or chronic infectious disease. Taking immunosuppressant or immunomodulating medications