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Abstract

A system for detection, measurement, analysis and plotting of electrocardiographic signals with amplitudes ranging down to one microvolt (micropotentials) employing long term ambulatory (Holter) recordings. Multi-channel electrocardiograms are recorded on a Holter recorder that inscribes calibration pulses at the beginning of each tape. The tape is played back at high speed on a scanner which uses the recorded calibration pulses to automatically calibrate the signal gains for each signal channel. The played back signals are digitized at sufficient resolution and sampling rate to permit analysis of micropotentials. The digitized raw data is stored in a permanent computer file available for multiple further analyses. A template heart beat is designated and the raw data file is signal averaged to reduce random noise. The averaged beat thus produced is permanently stored, and analyzed using a variety of operator selected standard signal processing techniques to reveal and evaluate micropotential signals of clinical significance.

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First Claim