When the variability indices (SDNN, SDANN, pNN50, etc) are presented low and exist complex ventricular arrhythmias during the monitorizao, the possibility of identification of individuals of bigger risk for sudden death, increase. Some studies have shown that the preditivo value of the Holter increases when the information of the RR variability are added. With the advance of the technology, mainly of computer science, the physician makes use currently of plus a weapon in the stratification of risk of patients with complex ventricular arrhythmias. Still exactly during the accomplishment of the electrocardiographic monitorizao of 24 hours, the analysis of the high resolution eletrocardiograma can supply useful information regarding the presence or not of arritmognico substratum. In a circuit re-entrant, the depolarization of the area of slow conduction occurs at the moment where the depolarization of the fabric normal is finishing or already it was completed. The electric activity of this region is quiet with the methods of conventional electrocardiographic registers. However, with the aid of softwares sophisticated and the manipulation adequate of the electric signals, the activation of the area of slow conduction can be detected by the high resolution eletrocardiograma. The information of this disgnostic modality also can be gotten jointly with the total of extra-sstoles or ventricular arrhythmias and with the variability of interval RR during the electrocardiographic monitorizao 24-hour thus increasing, positive the preditivo value of the gotten results. The studies that analyze the importance of not invasive methods of inquiry in the stratification of risk of patients with cardiac arrhythmias demonstrate that positive the preditivo value of these methods more is raised of what when the information for offered them are considered separately. With the knowledge of that the dispersion of the duration of interval QT as well as, the electric alternation of waves T can indicate the probability of bigger risk of arrhythmic events e, therefore, of sudden death, the incorporation of the analysis of these 0 variable during the electrocardiographic monitorizao 24-hour, will have to improve still more the capacity of this technique to identify the patients of high risk.