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Over the last ten years, it has become increasingly obvious that sudden death represents the major challenge confronting cardiology in the last part of the XXth Century. Careful epidemiologic studies have established the magnitude of this overall important problem of public health. The frequent association of sudden death with coronary artery disease has been demonstrated. Some of the electrophysiologic mechanisms underlying lethal arrhythmias have been unveiled. In addition, clinical markers permitting identifica- tion of high risk individuals have emerged. Finally, different studies have...

The saying, "What one does not know, one does not recognize", applies to the interpretation of the electrocardiogram. Recently a wealth of new information on the electrocardiogram has become avail- able by correlating electrocardiographic findings with information from new techniques such as His bundle recordings, programmed stimulation of the heart, 24-hour record- ing~, and cardiac scintigraphy. Also, our knowledge about the electrocardiogram has been extended by acquiring new epidemiologic data and by follow-up studies on patients with myocardial infarction and bundle branch block....