title: QT interval measurement using RMED curve; a novel approach based on wavelet techniques.
abstract: OBJECTIVE
  Prolonged QT interval is an index of propensity for dangerous ventricular tachyarrhythmias. The aim of this article is to establish an automatic algorithm for QT interval measurement.
  
  
  METHODS
  The proposed method is based on the continuous wavelet transform. In this method, the concepts of the rescaled wavelet coefficients and dominant scales of the electrocardiogram (ECG) components are used to perform detection of ECG characteristic points. A new concept of rescaled maximum energy density is introduced so as to perform the estimation of the QT interval.
  
  
  CONCLUSIONS
  We have applied the algorithm to the PTB database of the Physiobank∖Physionet in lead II. Then, the results were evaluated using pertinent reference QT. The criterion used for evaluation of the method's performance is the root mean square (RMS) error. The method approached the RMS error of 27.89 ms for 549 subjects. The proposed method is fast, simple and is applicable to a wide range of ECG cardio cycle morphologies.
authors.affiliation: Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Ghasemi
authors.forename: A
authors.initials: A
authors.lastname: Ghaffari
authors.forename: H
authors.initials: H
authors.lastname: SadAbadi
authors.forename: H
authors.initials: H
authors.lastname: Golbayani
mesh_terms: D000465:Algorithms; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology; D006801:Humans