title: [High resolution electrocardiogram in frequency domain. Use of statistical techniques of spectral correlation for identification of patients with sustained monomorphic ventricular tachycardia].
abstract: OBJECTIVE
  To evaluate the diagnostic accuracy of monomorphic ventricular tachycardia (MVT), in patients with structural heart diseases and episodes of sustained MVT, using the signal-averaged ECG (SAECG) in the time (TD) and the frequency domain (FD) with statistical techniques of spectral correlation.
  
  
  METHODS
  Twenty seven patients with at least one episode of sustained MVT, 30 patients with structural heart diseases and no evidence of ventricular arrhythmias and 80 subjects with no evidence of heart disease have been studied. SAECG was performed in all patients with the following parameters: duration of the filtered QRS, RMS 40 and LAS40 in TD and the mean and the standard deviation of both signal energy intersegmentar spectral correlation and energy frequency edge track in FD.
  
  
  RESULTS
  The sensitivity(S) and positive predict value (PPV) of the SAECG in TD, in FD and combined analysis of both domains were: S = 59.3%, 63.0%, 81.5% and PPV = 80.0%, 81.0%, 84.6%, respectively.
  
  
  CONCLUSIONS
  The combined analysis of SAECG in TD and in FD improves the diagnostic accuracy in patients with S sustained MVT.
authors.affiliation: Universidade do Estado do Rio de Janeiro.
authors.forename: E C
authors.initials: EC
authors.lastname: Barbosa
authors.forename: P R
authors.initials: PR
authors.lastname: Benchimol Barbosa
authors.forename: P
authors.initials: P
authors.lastname: Ginefra
authors.forename: F M
authors.initials: FM
authors.lastname: Albanesi Filho
mesh_terms: D000328:Adult; D000368:Aged; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D017180:Tachycardia, Ventricular / Q000175:diagnosis*; D013997:Time Factors