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

*Corresponding author for this work

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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