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Related Experiment Videos

The triangular wave test for electrocardiographic devices: a historical perspective.

James J Bailey1

  • 1Center of Information Technology, National Institutes of Health, Bethesda, MD 20892-5620, USA.

Journal of Electrocardiology
|November 10, 2004
PubMed
Summary

Eliminating baseline wander from ECG recordings is challenging. New nonlinear digital filters effectively suppress baseline wander without distorting the ST segment, unlike traditional filters.

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AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology.

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AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part VI: acute ischemia/infarction: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology.

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Circulation·2009
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AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part V: electrocardiogram changes associated with cardiac chamber hypertrophy: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society: endorsed by the International Society for Computerized Electrocardiology.

Circulation·2009

Area of Science:

  • Biomedical Engineering
  • Signal Processing

Background:

  • Baseline wander in electrocardiogram (ECG) recordings complicates interpretation, particularly ST deviation assessment.
  • Traditional high-pass filters (0.5 Hz cutoff) suppress baseline wander but introduce significant ST segment distortion due to phase nonlinearities.
  • This distortion arises from abrupt changes in frequency content and amplitude at the QRS-ST junction.

Observation:

  • Nonlinear digital filters developed since the 1980s offer a solution.
  • These filters can increase the low-frequency cutoff without introducing phase distortion.
  • The triangular wave test, introduced in 1990 AHA Recommendations, objectively measures baseline wander suppression efficacy without ST segment impact.

Findings:

  • Nonlinear digital filters effectively mitigate baseline wander.

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  • These advanced filters prevent ST segment distortion, a limitation of traditional methods.
  • The triangular wave test serves as a validated metric for filter performance.

    • Implications:

    • Improved accuracy in ECG interpretation, especially for ST deviation analysis.
    • Enhanced diagnostic capabilities through cleaner ECG signals.
    • Standardization of ECG filtering techniques in clinical practice and research.