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Related Experiment Videos

Late fractionated potentials and continuous electrical activity caused by electrode motion.

R E Ideker, G K Lofland, G H Bardy

    Pacing and Clinical Electrophysiology : PACE
    |September 1, 1983
    PubMed
    Summary

    Electrode motion can create artificial late fractionated potentials during cardiac mapping. These artifacts may mimic genuine signals used to locate ventricular arrhythmias, highlighting the need for careful interpretation.

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    Area of Science:

    • Electrophysiology
    • Cardiac Arrhythmia Research
    • Biomedical Engineering

    Background:

    • Late fractionated potentials are crucial for localizing ventricular arrhythmias during cardiac mapping.
    • These signals are often assumed to indicate re-entry when spanning diastole during tachycardia.

    Purpose of the Study:

    • To investigate the potential for artifactual generation of late fractionated potentials.
    • To determine if electrode motion can mimic these clinically significant signals.

    Main Methods:

    • A saline-soaked sponge with attached electrodes was placed on the canine right ventricle epicardium.
    • Electrodes were positioned 3 cm from the myocardium to isolate motion effects.
    • Recordings were highly amplified (4,000-40,000x) and filtered (50-300 Hz).

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    Main Results:

    • Artifactual late fractionated potentials were observed in 7 of 15 electrode recordings.
    • These potentials mimicked the amplitude, fractionation, and reproducibility of true signals.
    • Eliminating motion between the electrode and sponge abolished the artifactual activity.

    Conclusions:

    • Electrode motion, under high amplification and filtering, can produce artifacts that resemble late fractionated potentials.
    • These findings challenge the assumption that all observed late potentials are indicative of arrhythmogenic sources.
    • Careful consideration of mechanical factors is essential during cardiac mapping to avoid misinterpretation.