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Related Experiment Videos

Computer versus manual measurement of ST-segment deviation

M M Pelter1, M G Adams, B J Drew

  • 1University of California, San Francisco 94143, USA.

Journal of Electrocardiology
|April 1, 1997
PubMed
Summary

Computerized electrocardiogram (ECG) ST scores correlate highly with manual measurements, but computers detect subtle ischemia missed by human analysis. Manual measurements show high interrater reliability, though computer and manual scores should not be combined in research.

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Area of Science:

  • Cardiology
  • Medical Technology
  • Biomedical Engineering

Background:

  • Total ST scores from electrocardiograms (ECGs) estimate ischemic burden and predict reperfusion.
  • Computerized systems offer higher precision (10 microV) than human analysis (50 microV) for ST deviation measurements.

Purpose of the Study:

  • Compare computer-derived versus manually derived ST scores in ischemic 12-lead ECGs.
  • Assess interrater reliability of manual ST score measurements between two experts.

Main Methods:

  • Analyzed 58 subjects with ≥100 microV ST deviation during percutaneous transluminal coronary angioplasty.
  • Measured ST deviation at J+80 ms across all 12 leads, comparing computer and blinded manual assessments.
  • Used paired t-tests and Pearson correlation coefficients for statistical analysis.

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Main Results:

  • High correlation observed between computer and manual ST scores (r = .96).
  • Excellent interrater reliability between two manual reviewers (r = .96).
  • Computer measurements were consistently higher, suggesting detection of subtle ischemia missed by humans.

Conclusions:

  • Manual ST deviation measurements demonstrate high interrater reliability.
  • Computerized ECG analysis offers superior precision and may identify ischemia missed by manual review.
  • Researchers should avoid mixing computer and manual ST deviation scores in studies.