Method and device for analyzing a periodic or semi-periodic...

Surgery – Diagnostic testing – Cardiovascular

Reexamination Certificate

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Reexamination Certificate

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07151957

ABSTRACT:
A device for reducing noise in signals having successive substantially repetitive portions, comprising: an iterative averager operative to superimpose and average said substantially repetitive portions to produce a running average thereof, and an iteration ender comprising a noise analyzer for determining a noise level in said running average and ending operation of said iterative averager when said noise level reaches a predetermined level. Also, a method of obtaining an indication of ischemia in a patient using an ECG signal therefrom, the method comprising: extracting an ECG signal over a duration, extracting from said ECG signal a series of QRS complexes over said duration, extracting high frequency components of said QRS complexes, analyzing said high frequency components over said duration for at least one of a predetermined quality, and inferring from said predetermined quality an indication of ischemia.

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Beker et al, “Analysis of High Frequency QRS Potentials During Exercise Testing”, Proc. On Computers in Cardiology,IEEE Computer Soc., 1992, pp. 33-35.
Becker et al., “Analysis of High Frequency QRS Potential During Exercise Testing in Patients with Coronary Artery Disease and in Healthy Subjects”,PACE, 12:2040-2050, 1996.
Abboud, Shimon, “High-Frequency Electrocardiogram Analysis of the Entire QRS in the Diagnosis and Assessment of Coronary Artery Disease”,Progress in Cardiovascular Diseases, vol. XXXV, No. 5., Mar./Apr. 1993.
Becker et al, “Spectral Analysis of the High Resolution QRS Complex During Excersize-Induced Ischemia”,A.N.E., 1(4):386-392, 1996.

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