Adherence to Cied Implantation Guidelines and Cardiac Rehabilitation

Inclusion Criteria: * Admission to an in-hospital cardiac rehabilitation program because of a recent index event; * Provision of signed and dated informed consent form; * Age ≥ 18 years. * NYHA II-III class at the admittance in the cardiac rehabilitation facility; * LVEF ≤ 40% at echocardiography at the admittance in the cardiac rehabilitation facility; * Presence of a time-dependent indication to an ICD/CRT-D implantation: * \<3 month of optimal medical therapy; * \<40 days from the index myocardial infarction in patients with acute coronary syndrome; * 3 months from the revascularization procedure in patients with surgery; * \<3 months in patients with a de-novo heart failure episode of no ischemic etiology. * Patients who have already received an ICD/CRT-D for primary prevention before the admittance in the cardiac rehabilitation facility, despite a time-dependent indication to an ICD/CRT-D implantation; * Indication to ICD-CRT-D implantation for primary prevention. Exclusion Criteria: * Inability to give informed consent (diminished understanding or comprehension); * Age \< 18 years; * NYHA Class I or IV during the cardiac rehabilitation in-hospital stay; * LVEF \> 40% at echocardiography performed at the admittance in the cardiac rehabilitation facility * Absence of a time-dependent indication to an ICD/CRT-D implantation; * Indication to ICD-CRT-D implantation for secondary prevention.