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Method of Detecting Pacemaker Spikes in an Electrocardiograph Signal and Uniquely Encoding Them on an Ambulatory Recorder

IP.com Disclosure Number: IPCOM000042290D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Doran, SK: AUTHOR

Abstract

This article describes a method of detecting cardiac pacemaker spikes with simple parallel circuits before bandwidth limiting in a digital ambulatory ECG (electrocardiograph) system. The detected spike can be uniquely coded and recorded with the normal ECG data. A digital ambulatory system takes two or more ECG channels and converts them to digital data to be recorded on magnetic tape for 24 hours or more. The tape is then played back at a faster speed and any abnormal heart activity during the recording period can be detected. Fig. 1 is a simplified diagram of a digital ambulatory signal processor and recorder showing the additional circuit block required to implement the novel function. The signal from the patient electrodes enters the amplifiers 10 and 11 which respectively feed to anti-aliasing filters 12 and 13.

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Method of Detecting Pacemaker Spikes in an Electrocardiograph Signal and Uniquely Encoding Them on an Ambulatory Recorder

This article describes a method of detecting cardiac pacemaker spikes with simple parallel circuits before bandwidth limiting in a digital ambulatory ECG (electrocardiograph) system. The detected spike can be uniquely coded and recorded with the normal ECG data. A digital ambulatory system takes two or more ECG channels and converts them to digital data to be recorded on magnetic tape for 24 hours or more. The tape is then played back at a faster speed and any abnormal heart activity during the recording period can be detected. Fig. 1 is a simplified diagram of a digital ambulatory signal processor and recorder showing the additional circuit block required to implement the novel function. The signal from the patient electrodes enters the amplifiers 10 and 11 which respectively feed to anti-aliasing filters 12 and 13. The switch 15 permits an attending technician to select the channel that has the strongest pacemaker signal or, in the absence of a pacemaker, to turn off the spike detector. The box 16 is a schematic representation of a multiplexer that sequences the outputs of the filters 12 and 13, and any other channels connected to the patient, under control of a microprocessor 20, which also times the operation of the sample- and-hold circuit 22, the analog-to-digital (A/D) converter 24, and the spike detector 26. The microprocessor 20 recei...