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Sensors 2018, 18(2), 560; https://doi.org/10.3390/s18020560

Analysis of the High-Frequency Content in Human QRS Complexes by the Continuous Wavelet Transform: An Automatized Analysis for the Prediction of Sudden Cardiac Death

1
Arrhythmia Unit, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain
2
Instituto de Investigación Sanitaria del Principado de Asturias, 33011 Oviedo, Spain
3
Grupo para la Modelización Matemática Avanzada (MOMA), Universidad de Oviedo, 33004 Oviedo, Spain
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 6 February 2018 / Accepted: 7 February 2018 / Published: 12 February 2018
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2017)
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Abstract

Background: Fragmentation and delayed potentials in the QRS signal of patients have been postulated as risk markers for Sudden Cardiac Death (SCD). The analysis of the high-frequency spectral content may be useful for quantification. Methods: Forty-two consecutive patients with prior history of SCD or malignant arrhythmias (patients) where compared with 120 healthy individuals (controls). The QRS complexes were extracted with a modified Pan-Tompkins algorithm and processed with the Continuous Wavelet Transform to analyze the high-frequency content (85–130 Hz). Results: Overall, the power of the high-frequency content was higher in patients compared with controls (170.9 vs. 47.3 103nV2Hz−1; p = 0.007), with a prolonged time to reach the maximal power (68.9 vs. 64.8 ms; p = 0.002). An analysis of the signal intensity (instantaneous average of cumulative power), revealed a distinct function between patients and controls. The total intensity was higher in patients compared with controls (137.1 vs. 39 103nV2Hz−1s−1; p = 0.001) and the time to reach the maximal intensity was also prolonged (88.7 vs. 82.1 ms; p < 0.001). Discussion: The high-frequency content of the QRS complexes was distinct between patients at risk of SCD and healthy controls. The wavelet transform is an efficient tool for spectral analysis of the QRS complexes that may contribute to stratification of risk. View Full-Text
Keywords: electrocardiographic analysis; wavelet transform; high-frequency content; sudden cardiac death electrocardiographic analysis; wavelet transform; high-frequency content; sudden cardiac death
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García Iglesias, D.; Roqueñi Gutiérrez, N.; De Cos, F.J.; Calvo, D. Analysis of the High-Frequency Content in Human QRS Complexes by the Continuous Wavelet Transform: An Automatized Analysis for the Prediction of Sudden Cardiac Death. Sensors 2018, 18, 560.

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