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Performance improvement of a phase space detection algorithm for electrocardiogram wave morphology classification

  • Alberto Herreros
  • Enrique Baeyens Lázaro
  • Pedro Riverta
  • Rolf Johansson
Publiceringsår: 2011
Språk: Engelska
Sidor: 31-31
Publikation/Tidskrift/Serie: Journal of Electrocardiology
Volym: 44
Nummer: 2
Dokumenttyp: Artikel i tidskrift
Förlag: Elsevier


An algorithm based on embedding phase space signal was developed by the authors in previous works. The algorithm detects the characteristic points of the waves of a multilead electroacardiogram (ECG). In the present work, the parameters of this algorithm are optimized to improve its performance. The algorithm uses 2 configurable parameters to obtain the phase spacethe dimension of the phase space and the delayand a threshold to select the points of the ECG. By a proper selection of these parameters, the algorithm obtains all the points in the ECG that are similar to a reference one that was selected by the analyst. Several strategies have been developed and incorporated in the phase space algorithm to obtain the optimal values of these parameters based on the sampling rate and the number of leads in the records. The professional only needs to mark the reference point and the associated wave to it, for example, the start and end of a P wave and its peak. The algorithm obtains every P wave of the ECG record and a classification of their morphology using clustering techniques. Moreover, a simple graphical interface has been developed to ease its use.

The algorithm was applied to detect the start, peak, and end of the P waves of a collection of ECG records of 6 minutes. Using this information, the algorithm extracts and classifies the P waves by applying clustering techniques to study their variability. The algorithm can also be used online to detect and classify different types of morphologies in any ECG wave. A future use of this algorithm will be the detection of several extracardiac pathologies in the ECG Holter, for example, sleep apnea.


  • Control Engineering


  • LCCC-lup-obsolete
  • ISSN: 1532-8430

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