57-year-old man, former high-level athlete, asymptomatic; routine electrocardiogram;

Patient: 81-year-old man with previous history of extensive anterior infarction; hospitalization for 2 episodes of syncope;

Patient: 64-year-old man, hypertensive treated with amlodipine; control surface ECG; asymptomatic patient;

Patient: 63-year-old man with multiple risk factors (tobacco use, hypertension, NIDDM), chest pain since 1 hour; called the emergency services; ECG recorded on arrival at the emergency room.