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Asystolic episodes during pacemaker implantation

E A Astrinsky, S Furman, J Florio

    Circulation
    |June 1, 1981
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    Pulse generator programming can cause brief impulse suppression, leading to ventricular asystole up to 2.8 seconds. This occurs within a specific programming window but without significant clinical complications.

    Area of Science:

    • Cardiovascular physiology
    • Medical device engineering

    Background:

    • Pulse generators are crucial for cardiac rhythm management.
    • Normal rate programming involves adjusting pacing intervals.
    • Understanding device behavior during programming is vital for patient safety.

    Observation:

    • Rate programming of pulse generators can induce impulse suppression.
    • This suppression occurs within a specific 'susceptible window' during interval changes.
    • The duration of suppression is linked to the programmed interval, up to 3.935 seconds.

    Findings:

    • Four documented incidents of ventricular asystole (up to 2.8 seconds) were observed.
    • These events are directly attributed to the pulse interval control system during rate programming.
    • Suppression is avoided if programming occurs immediately after an output pulse.

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    Implications:

    • Physicians must be aware of this potential for asystole during pulse generator programming.
    • Device algorithms may require refinement to mitigate this programming-induced risk.
    • Despite documented asystole, no significant clinical complications were reported, suggesting a generally safe operational profile.