- Unstable angina or myocardial infarction within 4 months prior to inclusion, heart failure NYHA class III or IV angina, uncontrolled, history of severe coronary artery disease, an uncontrolled serious ventricular arrhythmia, a sick sinus syndrome, or electrocardiographic evidence of acute ischemia or conduction disturbances grade 3 unless the patient has a pacemaker