Vector spectral analysis of ventricular late potentials using the Hartley transform

OJ Escalona, RH Mitchell, DE Balderson, DWG Harron

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Frequency-domain analysis of ventricular late potentials in the three orthogonal leadsXYZ, signal-averaged ECG can reveal features of these bio-signals that can be of clinical importance. However, a consistent and simple method of spectral analysis has not been agreed. Consistency and simplicity of the method may be enhanced by optimising the windowing technique and by combining the spectral information of the three orthogonal leads. A convenient windowing technique and a novel method of vector spectral analysis of ventricular late potentials is presented in this paper. The method exploits the property of zero-phase normalisation in the N amplitude coefficients (real-valued) of the Discrete Hartley Transform. This property of the DHT allows an advantageous way of combining the three orthogonal spectra, SX, SY, and SZ, into a vector magnitude spectrum, (SX^2 + SY^2 + SZ^2)^1/2. Summation of amplitude coefficients in the -300 to -60 Hz and 60 to 300 Hz frequency ranges in the DHT vector spectrum provided a simple clinical parameter, S. A clinical evaluation of S indicated that S is of significantly greater value (38.3 ± 12.6 μV) in patients at risk than in healthy subjects (27 ± 10.3 μV), p <0.01.
LanguageEnglish
Title of host publicationActes du Sixieme Forum Jeunes Chercheurs en Genie Biologique et Medical
EditorsJ Moschetto
Place of PublicationLille Cedex, France
Pages70-71
Publication statusPublished - 29 Oct 1992

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spectral analysis
transform
method

Keywords

  • Late potentials
  • frequency-domain analysis
  • vector spectrum
  • discrete Hartley transform
  • windows.

Cite this

Escalona, OJ., Mitchell, RH., Balderson, DE., & Harron, DWG. (1992). Vector spectral analysis of ventricular late potentials using the Hartley transform. In J. Moschetto (Ed.), Actes du Sixieme Forum Jeunes Chercheurs en Genie Biologique et Medical (pp. 70-71). Lille Cedex, France.
Escalona, OJ ; Mitchell, RH ; Balderson, DE ; Harron, DWG. / Vector spectral analysis of ventricular late potentials using the Hartley transform. Actes du Sixieme Forum Jeunes Chercheurs en Genie Biologique et Medical. editor / J Moschetto. Lille Cedex, France, 1992. pp. 70-71
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Escalona, OJ, Mitchell, RH, Balderson, DE & Harron, DWG 1992, Vector spectral analysis of ventricular late potentials using the Hartley transform. in J Moschetto (ed.), Actes du Sixieme Forum Jeunes Chercheurs en Genie Biologique et Medical. Lille Cedex, France, pp. 70-71.

Vector spectral analysis of ventricular late potentials using the Hartley transform. / Escalona, OJ; Mitchell, RH; Balderson, DE; Harron, DWG.

Actes du Sixieme Forum Jeunes Chercheurs en Genie Biologique et Medical. ed. / J Moschetto. Lille Cedex, France, 1992. p. 70-71.

Research output: Chapter in Book/Report/Conference proceedingChapter

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N2 - Frequency-domain analysis of ventricular late potentials in the three orthogonal leadsXYZ, signal-averaged ECG can reveal features of these bio-signals that can be of clinical importance. However, a consistent and simple method of spectral analysis has not been agreed. Consistency and simplicity of the method may be enhanced by optimising the windowing technique and by combining the spectral information of the three orthogonal leads. A convenient windowing technique and a novel method of vector spectral analysis of ventricular late potentials is presented in this paper. The method exploits the property of zero-phase normalisation in the N amplitude coefficients (real-valued) of the Discrete Hartley Transform. This property of the DHT allows an advantageous way of combining the three orthogonal spectra, SX, SY, and SZ, into a vector magnitude spectrum, (SX^2 + SY^2 + SZ^2)^1/2. Summation of amplitude coefficients in the -300 to -60 Hz and 60 to 300 Hz frequency ranges in the DHT vector spectrum provided a simple clinical parameter, S. A clinical evaluation of S indicated that S is of significantly greater value (38.3 ± 12.6 μV) in patients at risk than in healthy subjects (27 ± 10.3 μV), p <0.01.

AB - Frequency-domain analysis of ventricular late potentials in the three orthogonal leadsXYZ, signal-averaged ECG can reveal features of these bio-signals that can be of clinical importance. However, a consistent and simple method of spectral analysis has not been agreed. Consistency and simplicity of the method may be enhanced by optimising the windowing technique and by combining the spectral information of the three orthogonal leads. A convenient windowing technique and a novel method of vector spectral analysis of ventricular late potentials is presented in this paper. The method exploits the property of zero-phase normalisation in the N amplitude coefficients (real-valued) of the Discrete Hartley Transform. This property of the DHT allows an advantageous way of combining the three orthogonal spectra, SX, SY, and SZ, into a vector magnitude spectrum, (SX^2 + SY^2 + SZ^2)^1/2. Summation of amplitude coefficients in the -300 to -60 Hz and 60 to 300 Hz frequency ranges in the DHT vector spectrum provided a simple clinical parameter, S. A clinical evaluation of S indicated that S is of significantly greater value (38.3 ± 12.6 μV) in patients at risk than in healthy subjects (27 ± 10.3 μV), p <0.01.

KW - Late potentials

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Escalona OJ, Mitchell RH, Balderson DE, Harron DWG. Vector spectral analysis of ventricular late potentials using the Hartley transform. In Moschetto J, editor, Actes du Sixieme Forum Jeunes Chercheurs en Genie Biologique et Medical. Lille Cedex, France. 1992. p. 70-71