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- W2060482007 abstract "To test the hypothesis that late potentials may be more enhanced by signal processing of intracardiac and epicardial electrograms, we performed a comparative analysis of signal averaging (SA) of the surface QRS complex (method I), signal averaging of an endocardial electrode catheter recording (method II), and epicardial recording (method III) in 24 patients (mean age = 55 ± 14 years). Sixteen of (he 24 patients (66%) had spontaneous as well as induced sustained ventricular tachycardia (VT), whereas the remaining 8 patients (33%) had spontaneous non-sustained VT. SA by the three methods was performed within ≤24 hours of each other, utilizing a band pass jilter frequency of 25 to 250 Hz. The duration of the SA-QRS complex, low amplitude signals (LAS) of <40 μV and the RMS-voltage (V) of the terminal 40 ms were determined for the three methods. There was a significant correlation between method I and methods II and III for the SA-QfiS duration (r = .928, p < .001), RMS-V(r = .634. p < .002) and LAS (r = .783, p < .001). There was no significant difference in the quantitative signal-averaged parameters between the three methods. The incidence of the RMS-V of <25 μV (37.5% vs 21%); LAS of >32 ms (46% vs 37.5%) and SA-QRS of >120 ms (54% vs 42%) was higher but statistically non-significant by methods II and III when compared to method I. We concluded that: (1) SA of intracardiac electrograms correlate well with SA of the surface QKS. This observation further validates the technique of surf ace SA to detect delayed ventricular activation. (2) SA of intracardiac electrograms may provide additional information on quantitative SA parameters relative to surface QRS in some patients with VT." @default.
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- W2060482007 date "1988-03-01" @default.
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- W2060482007 title "A Comparative Analysis of Signal Averaging of the Surface QRS Complex and Signal Averaging of Intracardiac and Epicardial Recordings in Patients with Ventricular Tachycardia" @default.
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- W2060482007 doi "https://doi.org/10.1111/j.1540-8159.1988.tb05004.x" @default.
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