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Pacing threshold changes after transvenous catheter countershock.

R Yee, D L Jones, G J Klein

    The American Journal of Cardiology
    |February 1, 1984
    PubMed
    Summary
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    Countershock catheters acutely increase pacing threshold and decrease R-wave amplitude in patients with ventricular tachyarrhythmias. These temporary changes suggest countershock catheters may not be suitable for backup pacing.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Devices

    Background:

    • Recurrent ventricular tachyarrhythmias necessitate advanced management strategies.
    • Countershock catheters are used for managing tachyarrhythmias, but their impact on cardiac pacing parameters is not fully understood.

    Purpose of the Study:

    • To investigate the acute and short-term effects of countershock catheter insertion on pacing threshold and R-wave amplitude.
    • To determine the suitability of countershock catheters as backup pacing devices.

    Main Methods:

    • Serial measurements of pacing threshold and R-wave amplitude in 12 patients undergoing countershock catheter insertion.
    • Monitoring parameters immediately post-countershock and over the first 7 days.

    Main Results:

    Related Experiment Videos

    • A significant acute increase in pacing threshold (1.4 to 2.4 V) and decrease in R-wave amplitude (bipolar and unipolar) was observed immediately after countershock.
    • Pacing threshold increased by 154% within the first 7 days of catheter presence.
    • Parameter values returned to baseline within 10 minutes post-countershock.

    Conclusions:

    • Catheter countershock acutely elevates pacing thresholds and reduces R-wave amplitude.
    • The findings suggest that a catheter used for countershock may compromise its efficacy as a backup pacing catheter.