TNNT2 and Ventricular arrhythmia: According to this in our study cardiac MRI was performed only in 17% of the population, after abnormal results highlighted by Holter ECG monitoring and/or treadmill test (repetitive and/or frequent ventricular arrhythmias), echocardiography (pericardial effusion) and/or serological test (abnormal values of cTnT).