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On-line microcomputer system for analysis of precordial maps

M B Henderson, P W Armstrong

Journal of Electrocardiology

|January 1, 1982

Summary

An automated system precisely analyzes ST segment heights and peak areas, offering a practical, economic solution for serial precordial mapping data analysis. This computer-aided method surpasses traditional hand analysis in accuracy and efficiency.

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Area of Science:

Biomedical Engineering
Cardiology
Medical Informatics

Background:

Serial precordial mapping generates large volumes of data.
Manual analysis of electrocardiogram (ECG) parameters like ST segment is time-consuming and prone to imprecision.

Purpose of the Study:

To develop an inexpensive, automated system for on-line analysis of ST segment heights and QRS complex areas.
To evaluate the accuracy and precision of the automated system compared to conventional hand analysis.

Main Methods:

An LSI-11 microcomputer system was developed for automated on-line analysis of ST segment, Q, R, and S heights and areas.
Computer graphics were used for peak magnification and labeling to evaluate system accuracy.
Sigma ST measurements (.06 seconds from S nadir) were compared between the automated system and three blinded observers for 20 maps.

Main Results:

The automated system demonstrated high accuracy, with correct evaluation in all but five of 2058 leads.
Mean computer sigma ST was 3.5 mv (range 0.82-9.3 mv), with a spread of +/-0.45 mv compared to observers.
Observer measurements showed greater variability (mean observer sigma ST 3.2 mv, mean inter-observer SD +/-0.21 mv), with discrepancies attributed to cumulative imprecision.

Conclusions:

The developed automated system is a practical and economic solution for handling large datasets in serial precordial mapping.
The system is considerably more precise than conventional hand analysis.
Its versatility makes it suitable for various clinical and research applications in cardiology.

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