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Related Experiment Videos

Microprocessor-based system for collection and storage of the equine vectorcardiogram

P W Physick-Sheard, W I Morris, D Genner

    American Journal of Veterinary Research
    |September 1, 1982
    PubMed
    Summary

    This study developed an affordable digital electrocardiogram (ECG) recording system for horses, enabling computerized vectorcardiographic analysis. The system uses an 8080 microprocessor and an 8-bit analog-to-digital converter for accurate equine cardiac data acquisition.

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    Area of Science:

    • Veterinary Cardiology
    • Biomedical Engineering
    • Equine Health

    Background:

    • Clinical application of semiorthogonal lead systems in horses requires computerized vectorcardiographic analysis.
    • Existing ECG recording and storage methods may not be cost-effective or suitable for computerized analysis.
    • Need for an inexpensive, reliable system for equine ECG data acquisition and processing.

    Purpose of the Study:

    • To develop and evaluate an inexpensive digital electrocardiogram (ECG) recording and storage system for horses.
    • To enable computerized vectorcardiographic analysis of equine cardiac electrical activity.
    • To establish basic requirements for digitizing analogue ECG data for veterinary applications.

    Main Methods:

    • Developed a system utilizing an 8080 microprocessor and an 8-bit analog-to-digital converter.

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  • Ensured signal-level compatibility with laboratory recorders and remote terminal functionality.
  • Implemented machine language programs for data acquisition, storage, and transfer to a central computing facility.
  • Collected 3-channel data at 8-bit accuracy with a sampling rate of 2,702 samples/s/channel and a frequency response of 0.05 to 2,500 Hz.

    • Main Results:

    • The developed system successfully recorded and stored equine ECG data.
    • Data acquisition achieved 8-bit accuracy at 2,702 samples/s/channel.
    • Preliminary analysis indicated a required system frequency response from DC to 1,300 Hz for accurate reproduction.
    • This necessitates a minimum sampling rate of 2,000 samples/s.

    Conclusions:

    • The developed system provides an inexpensive solution for recording and storing equine ECGs for computerized analysis.
    • The system's specifications meet the requirements for accurate vectorcardiographic analysis in horses.
    • Further optimization of the system's frequency response and sampling rate ensures reliable equine cardiac diagnostics.