Du är här

A Gaussian mixture model for time-frequency analysis during atrial fibrillation electrocardiograms

Författare:
Publiceringsår: 2007
Språk: Engelska
Sidor: 271-274
Publikation/Tidskrift/Serie: 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2007.
Dokumenttyp: Konferensbidrag
Förlag: IEEE Press

Sammanfattning

During atrial fibrillation (AF), time-frequency analysis of atrial signal has been applied to describe fibrillatory frequency trends. Recently, temporal changes in spectral shape have been investigated using the spectral profile technique. This profile is computed recursively by fitting each short-time log-spectrum to a spectral template, using amplitude scaling and frequency shifting. The purpose of the present study was to develop a Gaussian mixture model of the spectral profile in order to characterize the shape of AF waveforms. A novel index is introduced, the so-called harmonic index (HI), which reflects properties of the fundamental frequency peak and related harmonics peaks as estimated from the model. The index was tested on recordings from 9 patients with persistent AF, obtained before and after exercise testing. The HI succeeded in monitoring the response to exercise, i.e. change in the spectral profile to a less harmonic pattern, which is consistent with a reduction in AF organization (HI: 0.61±0.11 vs. 0.50±0.19, rest vs. exercise; p≪0.05).

Disputation

Nyckelord

  • Technology and Engineering

Övrigt

29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2007.
2007-08-22/2007-08-26
Lyon
Published
Yes
  • Signal Processing Group
  • ISSN: 1557-170X
  • ISBN: 978-1-4244-0788-0

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen

LERU logo U21 logo