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Related Experiment Videos

Dual mode sensing by a variable cycle ventricular synchronous pulse generator.

L M Edwards, R G Hauser

    Pacing and Clinical Electrophysiology : PACE
    |May 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    The Intermedics Cyberlith pacemaker

    Area of Science:

    • Cardiology
    • Biomedical Engineering

    Background:

    • The Intermedics Cyberlith pulse generator utilizes an R-wave synchronous (VVT) mode for pacing.
    • This mode involves a variable timing cycle with distinct periods for sensing and pacing responses.

    Purpose of the Study:

    • To elucidate the dual-mode response of the Intermedics Cyberlith pulse generator in VVT mode.
    • To explain the impact of sensed events during specific timing periods on pacemaker output.

    Main Methods:

    • Analysis of the Intermedics Cyberlith pulse generator's operational logic in VVT mode.
    • Examination of the interplay between sensed cardiac events and the device's timing cycle, including the inhibit alert period (IAP) and synchronous alert period (SAP).

    Main Results:

    Related Experiment Videos

  • Sensed events during the inhibit alert period (IAP) lead to inhibition of stimulus pulse output and reset the timing circuit.
  • Sensed events during the synchronous alert period (SAP) trigger stimulus pulses.
  • This dual response can result in observed synchronous and inhibited sensing, and a pacing rate below the programmed setting on an ECG rhythm strip.

    • Conclusions:

    • The variable timing cycle, comprising IAP and SAP, governs the dual response of the Intermedics Cyberlith pulse generator in VVT mode.
    • Understanding these periods is crucial for interpreting pacemaker behavior and ECG findings in patients with this device.