title: [High resolution electrocardiogram and late potential monitoring].
abstract: The signal-averaged ECG became an important noninvasive method for identifying life-threatening ventricular arrhythmias. It is most accurate in patients with coronary artery disease and can be helpful in predicting whether a patient with an unexplained syncope or nonsustained VT is at risk of developing sustained ventricular tachycardia or not. A patient with an entirely normal signal-averaged ECG is at very low risk of sustained VT. In contrast, an abnormal signal-averaged ECG should raise suspicion about VT, and prompt further studies, including electrophysiological testing. Signal-averaged ECG can also be used repeatedly with acceptable reproducibility. Technological advances and improvements in the frequency analysis of the averaged signal may increase the predictive accuracy of the technique and consequently enhance its clinical applications.
authors.affiliation: Serviço de Terapêutica Médica, Faculdade de Medicina do Porto.
authors.forename: O
authors.initials: O
authors.lastname: Costa
authors.forename: J
authors.initials: J
authors.lastname: Puig
authors.forename: J
authors.initials: J
authors.lastname: Freitas
authors.forename: M J
authors.initials: MJ
authors.lastname: Carvalho
authors.forename: P
authors.initials: P
authors.lastname: Fernandes
authors.forename: F
authors.initials: F
authors.lastname: de Freitas
mesh_terms: D004562:Electrocardiography / Q000379:methods*; D006801:Humans; D013610:Tachycardia / Q000503:physiopathology*
vernacular_title: O electrocardiograma de alta resolução e o registo de potenciais tardios.