SIGNAL AVERAGING TECHNIQUE FOR NONINVASIVE RECORDING OF LATE POTENTIALS IN PATIENTS WITH CORONARY ARTERY DISEASE.

Shimon Abboud, Charles M. Blatt, Bernard Lown, Thomas B. Graboys, Dror Sadeh, Richard J. Cohen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

An advanced noninvasive signal averaging technique was used to detect late potentials in two groups of patients: Group A (24 patients) with coronary artery disease (CAD) and without sustained ventricular tachycardia (VT) and Group B (8 patients) with CAD and sustained VT. Recorded analog data were digitized and aligned using a cross correlation function with fast Fourier transform schema, averaged and bandpass filtered between 60 and 200 Hz with a nonrecursive digital filter. Averaged filtered waveforms are analyzed by computer program for three parameters: (1) filtered QRS (fQRS) duration; (2) interval between the R wave peak and the end of fQRS (R-LP), and (3) RMS value of last 40 ms of fQRS (RMS). Significant change was found between Groups A and B in fQRS (101 plus or minus 13 ms vs. 123 plus or minus 15 ms, p less than 0. 0005) and in R-LP (52 plus or minus 11 ms vs. 71 plus or minus 18 ms, p less than 0. 002). It is concluded that (1) the use of a cross correlation triggering method and nonrecursive digital filter enables a reliable recording of late potentials from the body surface, and (2) fQRS and R-LP durations are sensitive indicators of CAD patients susceptible to VT.

Original languageEnglish
Title of host publicationComputers in Cardiology
PublisherIEEE
Pages525-528
Number of pages4
ISBN (Print)081860817X
StatePublished - 1987

Publication series

NameComputers in Cardiology
ISSN (Print)0276-6574

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