Improved selection of patients for programmed ventricular stimulation by frequency analysis of signal-averaged electrocardiograms.
作者： B D Lindsay , H D Ambos , K B Schechtman , M E Cain
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摘要: Improved selection of patients with suspected sustained ventricular tachycardia (VT) for programmed stimulation is needed. To determine if frequency analysis detects in whom VT might be induced, we first obtained fast-Fourier transforms (FFT) signal-averaged electrocardiograms (ECGs) from 20 spontaneous (group 1) and compared them the results single double extrastimuli during two cycle lengths burst pacing right sites. The FFT data were expressed as an area ratio that quantified relative contributions to 50 Hz frequencies terminal QRS ST segment. A logistic regression inducibility dependent variable was used help define values greater than abnormal. Sustained monomorphic induced 18 patients, each value 20. not less then prospectively 38 II) nonsustained (12 patients) or syncope (26 referred electrophysiologic study. In none 26 group II normal inducible. five 12 abnormal values. Thus, correctly predicted 88% studied 82% VT. Moreover, all identified correctly.(ABSTRACT TRUNCATED AT 250 WORDS)
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