Importance of noise reduction for signal averaged electrocardiography

Steinberg, Jonathan S.; Lander, P.

doi:10.1007/978-94-011-0894-2_12

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…The noise component of LP is expressed by the following equation (Steinberg & Lander, 1993):

\sum_{J = 1}^{R} italicnj ()(, i) / R .

…”

Section: Discussionmentioning

confidence: 99%

Increasing averaging beats improves the test accuracy on Holter‐based late potentials in patients with myocardial infarction

Hashimoto,

Harada,

Kimata

et al. 2023

Noninvasive Electrocardiol

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BackgroundThe prevalence of Holter‐based late potentials (H‐LPs) in cases of fatal cardiac events has increased. Although the noise level of H‐LP is higher than that of conventional real‐time late potential (LP) recording, a procedure to reduce the noise severity in H‐LP by increasing the averaging beats has not been investigated.MethodsWe enrolled 104 patients with post‐myocardial infarction (MI) and 86 control participants. Among the patients, 30 reported sustained ventricular tachycardia (VT), and the remaining 74 had unrecorded VT. H‐LPs were measured twice in all groups to evaluate the efficacy of increasing the averaging beats for H‐LPs. Thereafter, the average of LP was calculated at 250 (default setting), 300, 400, 500, 600, 700, and 800 beats.ResultsAcross all three groups (MI‐VT group, MI non‐VT group, and control group), the noise levels significantly decreased in consonance with the increase in averaging beats. In the MI‐VT group, the H‐LP positive rate considerably increased with the increase in the averaging beats from 250 to 800 both at night and daytime. In the MI‐VT group, the LP parameters significantly deteriorated, which led to a positive judgment corresponding to the increment of the averaged night and day beats. The H‐LP positive rates were unchanged in the MI non‐VT and control groups, while the LP parameters remained consistent, despite the increased averaging beats in the MI non‐VT and control groups.ConclusionIncreasing the calculated averaging beats in H‐LPs can improve the sensitivity of predicting fatal cardiac events in patients with MI.

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“…The noise component of LP is expressed by the following equation (Steinberg & Lander, 1993):

\sum_{J = 1}^{R} italicnj ()(, i) / R .

…”

Section: Discussionmentioning

confidence: 99%

Increasing averaging beats improves the test accuracy on Holter‐based late potentials in patients with myocardial infarction

Hashimoto,

Harada,

Kimata

et al. 2023

Noninvasive Electrocardiol

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Identification of post-myocardial infarction patients prone to ventricular tachycardia using time–frequency analysis of QRS and ST segments

et al. 2000

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Time‐Domain Signal‐Averaged Electrocardiogram in Nonischemic Ventricular Tachycardia

Fauchier

Babuty

et al. 1996

Pacing Clinical Electrophis

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The prevalence of late ventricular potentials (LVPs) detected by signal averaged ECG (SAECG) is variable in nonischemic heart diseases. In idiopathic dilated cardiomyopathy, the prevalence increases from about 25% to 70%-90% in cases of spontaneous sustained ventricular tachycardia (VT), is not significantly correlated with hemodynamic and Holter data, and has a good positive predictive value for induced and spontaneous sustained VT. However, its predictive value for cardiac death has not been established. In primary hypertrophic cardiomyopathy, LVPs are rare (about 10%), not correlated to hemodynamic data, enhanced in cases of spontaneous sustained VT (up to 77%), and have a good predictive value of induced VT. LVP-SAECG are frequent in arrhythmogenic right ventricular dysplasia (ARVD) (70%-80%). They can identify patients with VT and an unapparent or limited form of this disease, or ARVD with few ventricular arrhythmias. The prevalence (26%-37%) of LVPs in mitral valve prolapse is clearly higher than in normal individuals or in other valvular diseases and is enhanced in cases of spontaneous and induced VT. Its significance remains speculative. After surgical repair of tetralogy of Fallot, LVPs can identify a group of patients with higher probability of induced and spontaneous risk of VT. The usefulness and significance of LVPs in other nonischemic cardiac diseases have not to date been established. In "true" idiopathic VT, without proved structural cardiac disease, the prevalence of LVPs does not exceed that observed in normal individuals (0%-5%), but in "apparent" idiopathic VT the prevalence of LVPs rises to 20%-40%. In these latter cases more invasive techniques must be used to discover a limited form of myocardiopathy.

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Importance of noise reduction for signal averaged electrocardiography

Cited by 4 publications

References 26 publications

Increasing averaging beats improves the test accuracy on Holter‐based late potentials in patients with myocardial infarction

Increasing averaging beats improves the test accuracy on Holter‐based late potentials in patients with myocardial infarction

Identification of post-myocardial infarction patients prone to ventricular tachycardia using time–frequency analysis of QRS and ST segments

Time‐Domain Signal‐Averaged Electrocardiogram in Nonischemic Ventricular Tachycardia

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