A Method for Ventricular Late Potentials Detection Using Time-Frequency Representation and Wavelet Denoising

Gadaleta, Matteo; Giorgio, Agostino

doi:10.5402/2012/258769

Cited by 20 publications

(9 citation statements)

References 8 publications

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“…The VLP is a high-frequency and very-low-intensity signal that is localized at the end of QRS duration, and on the beginning part of ST segment [ 34 ], as shown in Fig. 6 .…”

Section: The Ten Potential Ecg Parametersmentioning

confidence: 99%

ECG Parameters for Malignant Ventricular Arrhythmias: A Comprehensive Review

Mandala

2017

J. Med. Biol. Eng.

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Many studies showed electrocardiogram (ECG) parameters are useful for predicting fatal ventricular arrhythmias (VAs). However, the studies have several shortcomings. Firstly, all studies lack of effective way to present behavior of various ECG parameters prior to the occurrence of the VAs. Secondly, they also lack of discussion on how to consider the parameters as abnormal. Thirdly, the reports do not include approaches to increase the detection accuracy for the abnormal patterns. The purpose of this study is to address the aforementioned issues. It identifies ten ECG parameters from various sources and then presents a review based on the identified parameters. From the review, it has been found that the increased risk of VAs can be represented by presence and certain abnormal range of the parameters. The variation of parameters range could be influenced by either gender or age. This study also has discovered the facts that averaging, outliers elimination and morphology detection algorithms can contribute to the detection accuracy.

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“…The VLP is a high-frequency and very-low-intensity signal that is localized at the end of QRS duration, and on the beginning part of ST segment [ 34 ], as shown in Fig. 6 .…”

Section: The Ten Potential Ecg Parametersmentioning

confidence: 99%

ECG Parameters for Malignant Ventricular Arrhythmias: A Comprehensive Review

Mandala

2017

J. Med. Biol. Eng.

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“…The appearance of VLPs in SAECG may indicate myocardial scar tissue in ventricles leading to delayed ventricular activation 14 . SAECG is being used in identifying the patients with a higher risk of ventricular dysfunction and reentrant ventricular tachyarrhythmia and hence, detecting the patients with a predisposition toward SCD 15 . In a study by Tahara et al 16 the filtered QRS duration was measured in SAECG in patients with ventricular dyssynchrony.…”

Section: Discussionmentioning

confidence: 99%

Signal averaged ECG in patients with early repolarization

Hassanzadeh

Mardani

Hosseinpour

et al. 2021

Journal of Arrhythmia

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Background Early repolarization (ER) pattern is diagnosed when the J‐point is elevated on the patient's electrocardiogram. The aim of this study was to evaluate signal‐averaged electrocardiography (SAECG) in patients with ER pattern. Methods Subjects were divided into three groups: 1‐patients with normal ECG pattern (control group); 2‐patients with J‐point elevation in the inferior leads; and 3‐patients with J‐point elevation in non‐inferior leads. Results The mean filtered QRS duration in groups with J‐point elevation in inferior leads and non‐inferior leads and in the control, was 86.4 ± 23.4 msec, 84.8 ± 26.6 msec, and 85.8 ± 24.8 msec, respectively, indicating no significant difference across the three groups. The mean duration of terminal QRS < 40µV was 21.2 ± 4.2 msec, 22.8 ± 4.6 msec, and 23.1 ± 4.5 msec in the mentioned groups, respectively, without a significant difference between the groups. Additionally, the mean root‐mean‐square voltage of terminal 40 msec was 34.5 ± 8.3 µV, 35.3 ± 8.6µV, and 35.7 ± 9.2 µV in patients with increased J‐point in inferior leads, non‐inferior leads, and the control group, respectively, showing no difference between the groups. Conclusion In conclusion, we found that parameters in SAECG did not have any significant difference between patients with ER pattern and healthy individuals. Moreover, we concluded that SAECG cannot distinguish the patients with elevated J‐point in inferior leads from non‐inferior leads. Overall, SAECG does not appear to be a reliable diagnostic tool for the assessment of ER pattern.

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“…The end of the QRS complex is a particular area of interest, as ventricular late potentials falling outside the standard QRS duration window may represent areas of diseased myocardium and substrate for reentry ventricular tachycardia. These late potentials are commonly visualized using high‐resolution ECGs, where increasing evidence for abnormal signal‐averaged electrograms (SAECGs) can be used as a powerful predictor of worse outcomes in arrhythmia patients (Gadaleta & Giorgio, 2012 ). In relation of electrograms to revascularization procedures, evidence from the Coronary Artery Bypass Graft (CABG) Patch Trial has demonstrated up to two times the mortality rate reported after 2 years post‐surgery in patients with abnormal SAECGs at baseline compared to patients with normal electrocardiograms (Curtis et al., 1997 ; The CABG Patch Trial Investigators & Coordinators, 1993 ).…”

Section: Discussionmentioning

confidence: 99%