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"Invisible" pseudo-pseudofusion beats.

A Castellanos, L Zaman, R J Myerburg

    Pacing and Clinical Electrophysiology : PACE
    |March 1, 1982
    PubMed
    Summary
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    Pseudo-pseudofusion beats from atrial pacemaker spikes were observed in ECG lead II. These events were nearly invisible in lead I and completely invisible in lead VI due to lead placement and timing.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Electrophysiology

    Background:

    • AV sequential (DVI) pacemakers are designed for synchronized atrial and ventricular pacing.
    • Pacemaker function is typically monitored using surface electrocardiogram (ECG) leads.
    • Understanding pacemaker artifact and its visibility across different ECG leads is crucial for accurate interpretation.

    Observation:

    • Simultaneous ECG leads (I, II, and VI) were recorded in a patient with a functioning DVI pacemaker.
    • Ineffectual atrial pacemaker spikes superimposed on QRS complexes created pseudo-pseudofusion beats.
    • These pseudo-pseudofusion beats were clearly visible in lead II but minimally or not visible in leads I and VI.

    Findings:

    • The visibility of pseudo-pseudofusion beats varied significantly across different ECG leads.

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  • Lead placement and the timing of ventricular depolarization relative to atrial spike delivery influenced artifact visibility.
  • Atrial spikes were detected in lead II but were obscured or absent in leads I and VI.

    • Implications:

    • This phenomenon highlights potential challenges in ECG interpretation of pacemaker function.
    • Variability in artifact visibility can lead to misinterpretation of pacemaker performance.
    • Careful lead selection and analysis are necessary to accurately assess pacemaker function and detect subtle abnormalities.