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  • 1
    Electronic Resource
    Electronic Resource
    Later potentials on signal-averaged electrocardiograms in children after right ventriculotomy (1995)
    Springer
    Pediatric cardiology 16 (1995), S. 114-119 
    Details
    ISSN: 1432-1971
    Keywords: Operated congenital heart defect ; Children ; Signal-averaged electrocardiography ; Late potentials ; Arrhythmias
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract After corrective surgery for congenital heart defects, scars may create fractionation and delay of the electrical signals in the heart muscle, providing a substrate for arrhythmias. Signalaveraged electrocardiograms (SAECGs) were obtained from 33 children after right ventriculotomy, on average 6 years after surgery, and from 38 healthy controls of the same age. The duration of the filtered QRS complex (fQRS), the duration of the low amplitude signal (〈40μV) in the terminal QRS complex (LAS40), and the root mean square amplitude of the terminal 40 ms of the QRS complex (RMS40) were determined. The values of fQRS ≥117 ms, RMS40≤25μV, and LAS40≥35 ms, which were beyond the mean ±2 SD of the healthy controls, were considered abnormal. Most patients had right bundle branch block and therefore a prolonged fQRS. Late potentials were defined as present if both the RMS40 and LAS40 were abnormal. Altogether nine patients (27%) had late potentials. In the patients with late potentials the incidence of serious ventricular arrhythmias was 44% (4 of 9) and in the patients without late potentials 0% (0 of 24). In seven patients with enlargement of the right ventricle, the incidence of arrhythmias was 57% (4 of 7) when late potentials were present and 0% (0 of 7) when they were absent. In the present study late potentials were associated with a history of arrhythmias, especially when the right ventricle was enlarged. Therefore the SAECG may be useful for determining the risk of serious arrhythmia events in children operated for congenital heart defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00801908
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of post-myocardial infarction patients with ventricular tachycardia by time-domain intra-QRS analysis of signal-averaged electrocardiogram and magnetocardiogram (2000)
    Springer
    Medical & biological engineering & computing 38 (2000), S. 659-665 
    Details
    ISSN: 1741-0444
    Keywords: Risk stratification ; Magnetocardiography ; High-resolution electrocardiography ; Ventricular tachycardia ; Sudden cardiac death ; Myocardial infarction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A new time-domain analysis method, which quantifies ECG/MCG intra-ORS fragmentation, is applied to parts of the QRS complex to identify postmyocardial infarction patients with ventricular tachycardia. Three leads of signalaveraged electrocardiograms and nine leads of magnetocardiograms were band-pass filtered (74Hz to 180Hz). The filtered signals showed fragmentation in the QRS region, which was quantified by the number of peaks M and a score S, that is the product of M and the sum of the peak amplitudes. Both parameters were determined for the first 80 ms of the QRS complex and the total QRS complex in each channel. For classification, the mean-values of the parameters M and S of the three electrical leads and the nine magnetic leads were calculated. Late potential and late field analyses were performed for the same signals. 31 myocardial infarction patients were included, 20 of them with a history of documented ventricular tachycardia (VT). Identification of VT patients using the SAECG led to better results (sensitivity 95%, specificity 91%) considering the entire QRS complex than with the standard late potential analysis suggested by Simson (sensitivity 90%, specificity 73%). For the SAMCG and the entire QRS complex results using the parameters S and M are also better (sensitivity 95%, specificity 100%) than for the late field analysis (sensitivity 90% and specificity 100%). For the first 80 ms, the performance of the parameters M and S is only slightly decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344872
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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