Normal values and methodologic recommendations for signal-averaged electrocardiography in children and adolescents

Fallah-Najmabadi, Hessameddin; Dahdah, Nagib; Palcko, Molly; Mehta, Sudhir

doi:10.1016/s0002-9149(97)89373-3

Cited by 17 publications

(7 citation statements)

References 19 publications

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“…This might explain the reduction of noise level when high-pass ®lter setting is increased to greater than 40 Hz frequency in our study. Similar trend is also observed in the study of Gomez et al 4 and Fallah-Najmabadi et al 18 Gomez et al 4 evaluated the effects of different band-pass ®lters on the SAECG variables both in normal subjects and in patients with organic heart disease. They showed that the noise level was highest at 10 Hz but declined progressively as the ®lter frequencies increased to 80 Hz, a function of ®ltering.…”

Section: Discussionsupporting

confidence: 64%

Evaluation of signal-averaged electrocardiogram in healthy obese women: effects of subcutaneous adipose tissue

et al. 1997

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OBJECTIVE: To determine the correlations between signal-averaged electrocardiography (SAECG) indices and various anthropometric parameters in obese women. SUBJECTS: Twenty-seven healthy obese women (mean age 29.7 AE 9.6 y, mean body mass index 35.2 AE 6.0 kg/m 2 ). MEASUREMENTS: SAECG was performed using a Marquette, MAC 12/15 system. Bidirectional ®ltering, low-pass ®ltering 250 Hz and 25, 40 and 80 Hz high-pass ®lter settings were employed on the same averaged beats. At least 200 beats were averaged to achieve a noise level`1 mV. Body mass index, waist to hip circumference ratio, neck circumference, arm circumference and conicity index were determined for all subjects. Skinfold thicknesses were measured in triceps, biceps, subscapular, supra-iliac and para-umbilical regions. RESULTS: Signi®cant correlations were observed between the root mean square (RMS) voltage of the terminal 40 ms of the ®ltered QRS complex at 25 and 40 Hz and skinfold thicknesses measured at different sites. Signi®cant correlations were obtained between the noise level at 25 and 40 Hz and skinfold thicknesses measured at subscapular, biceps and triceps regions also. The only SAECG parameter correlated signi®cantly with the noise level was the RMS voltage at 25 and 40 Hz high-pass ®lter settings. CONCLUSIONS: In obese women SAECG must be performed with 80 Hz high-pass ®lter setting which eliminates the random noise originating from the subcutaneous adipose tissue. In addition RMS voltage which shows positive linear correlations with the noise level of 25 and 40 Hz high-pass ®lter settings might be inappropriate for the de®nition of abnormal SAECG criteria in obese women.

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Section: Discussionsupporting

confidence: 64%

Evaluation of signal-averaged electrocardiogram in healthy obese women: effects of subcutaneous adipose tissue

et al. 1997

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“…16 Normal values for children have been published. 17 The 12-lead ECG was performed at rest and included the standard-limb and augmented-limb leads and precordial leads V 3 R, V 1 , V 2 , V 4 , V 6 , and V 7 . Corrected QT interval (QTc) was calculated using Bazett's formula.…”

Section: Cardiac Evaluationmentioning

confidence: 99%

“…SA-ECG was performed on those who were 6 years or older and evaluated for the presence of late potentials, with an abnormal SA-ECG defined as abnormalities in the duration of the high-frequency, low-amplitude signals (Ͻ40 V), filtered total QRS duration, and the root-mean-squared voltage in the terminal 40 milliseconds. 17 TWA was performed according to previously published guidelines 14,18 in those who were 10 years or older. Recording of the TWA was done at rest and during a state of increased heart rate, using a stationary bicycle to achieve a heart rate of ϳ70% of the predicted maximum or Ͼ120 beats per minute (bpm).…”

Section: Cardiac Evaluationmentioning

confidence: 99%

Cardiac and Clinical Phenotype in Barth Syndrome

Spencer¹,

et al. 2006

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Our cohort demonstrated clinical variability, but most had cardiomyopathy and diminished growth velocity, with a propensity toward neutropenia and low cholesterol. There was increased incidence of ventricular arrhythmia, predominantly in adolescents and young adults. Barth syndrome should be considered when boys present with cardiomyopathy, especially when associated with increased left ventricular trabeculations, neutropenia, skeletal muscle weakness, or family history indicating an X-linked pattern of inheritance.

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“…Normal values for the pediatric population have been established in multiple studies [ Table 4] [50].…”

Section: Signal-averaged Electrocardiogrammentioning

confidence: 99%

Role of invasive and noninvasive testing in risk stratification of sudden cardiac death in children and young adults: an electrophysiologic perspective

Attari

Dhala

2004

Pediatric Clinics of North America

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Normal values and methodologic recommendations for signal-averaged electrocardiography in children and adolescents

Cited by 17 publications

References 19 publications

Evaluation of signal-averaged electrocardiogram in healthy obese women: effects of subcutaneous adipose tissue

Evaluation of signal-averaged electrocardiogram in healthy obese women: effects of subcutaneous adipose tissue

Cardiac and Clinical Phenotype in Barth Syndrome

Role of invasive and noninvasive testing in risk stratification of sudden cardiac death in children and young adults: an electrophysiologic perspective

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