PC based high resolution ECG system

Author

Ider, Y. Ziya ; Oto, Ali

Author_Institution

Dept. of Electr. Eng., Middle East Tech. Univ., Ankara, Turkey

fYear

1990

fDate

23-26 Sep 1990

Firstpage

665

Lastpage

668

Abstract

A PC-based high-resolution electrocardiography system is developed. The system consists of an add-on card, a computer and a printer. The add-on card has all the analog and digital circuits needed for data acquisition. Bipolar X, Y, Z signals are first acquired to RAM without any interruption and then transferred to disc. Two-Mbyte RAM is required for uninterrupted 2.5-minute raw data to be collected. An operator-controlled template selection is followed by signal averaging, high-pass filtering (25-250 Hz) and calculation of Simson´s criteria for detection of late potentials. It is shown that terminal portion of the QRS can be modeled as sum of decaying sinusoids with less than 25-Hz frequency. When this model signal is estimated and subtracted from the QRS signals, higher-frequency (25-250 Hz) activity is much better isolated both in the time and the frequency domains

Keywords

biomedical equipment; computerised instrumentation; electrocardiography; microcomputer applications; 2 MB; 2.5 min; 25 to 250 Hz; PC based high resolution ECG system; QRS; Simson´s criteria; add-on card; analog circuits; bipolar signals; data acquisition; decaying sinusoids; digital circuits; frequency domain; high-pass filtering; late potential detection; model signal; operator-controlled template selection; printer; signal averaging; time domain; Data acquisition; Electrocardiography; Frequency estimation; Hardware; Instruments; Microcomputers; Printers; Read-write memory; Signal resolution; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology 1990, Proceedings.

Conference_Location

Chicago, IL

Print_ISBN

0-8186-2225-3

Type

conf

DOI

10.1109/CIC.1990.144307

Filename

144307