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Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems

BACKGROUND: A specific problem using the public access defibrillators (PADs) arises at the railway stations. Some countries as Germany, Austria, Switzerland, Norway and Sweden are using AC railroad net power-supply system with rated 16.7 Hz frequency modulated from 15.69 Hz to 17.36 Hz. The power su...

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Detalles Bibliográficos
Autores principales: Christov, Ivaylo I, Iliev, Georgi L
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2005
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1079897/
https://www.ncbi.nlm.nih.gov/pubmed/15766390
http://dx.doi.org/10.1186/1475-925X-4-16
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author Christov, Ivaylo I
Iliev, Georgi L
author_facet Christov, Ivaylo I
Iliev, Georgi L
author_sort Christov, Ivaylo I
collection PubMed
description BACKGROUND: A specific problem using the public access defibrillators (PADs) arises at the railway stations. Some countries as Germany, Austria, Switzerland, Norway and Sweden are using AC railroad net power-supply system with rated 16.7 Hz frequency modulated from 15.69 Hz to 17.36 Hz. The power supply frequency contaminates the electrocardiogram (ECG). It is difficult to be suppressed or eliminated due to the fact that it considerably overlaps the frequency spectra of the ECG. The interference impedes the automated decision of the PADs whether a patient should be (or should not be) shocked. The aim of this study is the suppression of the 16.7 Hz interference generated by the power supply of the railway systems. METHODS: Software solution using adaptive filtering method was proposed for 16.7 Hz interference suppression. The optimal performance of the filter is achieved, embedding a reference channel in the PADs to record the interference. The method was tested with ECGs from AHA database. RESULTS: The method was tested with patients of normal sinus rhythms, symptoms of tachycardia and ventricular fibrillation. Simulated interference with frequency modulation from 15.69 Hz to 17.36 Hz changing at a rate of 2% per second was added to the ECGs, and then processed by the suggested adaptive filtering. The method totally suppresses the noise with no visible distortions of the original signals. CONCLUSION: The proposed adaptive filter for noise suppression generated by the power supply of the railway systems has a simple structure requiring a low level of computational resources, but a good reference signal as well.
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spelling pubmed-10798972005-04-15 Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems Christov, Ivaylo I Iliev, Georgi L Biomed Eng Online Research BACKGROUND: A specific problem using the public access defibrillators (PADs) arises at the railway stations. Some countries as Germany, Austria, Switzerland, Norway and Sweden are using AC railroad net power-supply system with rated 16.7 Hz frequency modulated from 15.69 Hz to 17.36 Hz. The power supply frequency contaminates the electrocardiogram (ECG). It is difficult to be suppressed or eliminated due to the fact that it considerably overlaps the frequency spectra of the ECG. The interference impedes the automated decision of the PADs whether a patient should be (or should not be) shocked. The aim of this study is the suppression of the 16.7 Hz interference generated by the power supply of the railway systems. METHODS: Software solution using adaptive filtering method was proposed for 16.7 Hz interference suppression. The optimal performance of the filter is achieved, embedding a reference channel in the PADs to record the interference. The method was tested with ECGs from AHA database. RESULTS: The method was tested with patients of normal sinus rhythms, symptoms of tachycardia and ventricular fibrillation. Simulated interference with frequency modulation from 15.69 Hz to 17.36 Hz changing at a rate of 2% per second was added to the ECGs, and then processed by the suggested adaptive filtering. The method totally suppresses the noise with no visible distortions of the original signals. CONCLUSION: The proposed adaptive filter for noise suppression generated by the power supply of the railway systems has a simple structure requiring a low level of computational resources, but a good reference signal as well. BioMed Central 2005-03-15 /pmc/articles/PMC1079897/ /pubmed/15766390 http://dx.doi.org/10.1186/1475-925X-4-16 Text en Copyright © 2005 Christov and Iliev; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Christov, Ivaylo I
Iliev, Georgi L
Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems
title Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems
title_full Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems
title_fullStr Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems
title_full_unstemmed Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems
title_short Public access defibrillation: Suppression of 16.7 Hz interference generated by the power supply of the railway systems
title_sort public access defibrillation: suppression of 16.7 hz interference generated by the power supply of the railway systems
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1079897/
https://www.ncbi.nlm.nih.gov/pubmed/15766390
http://dx.doi.org/10.1186/1475-925X-4-16
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