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Related Experiment Videos

Simultaneous right atrial appendage sensing with a target tip, a solid tip and J orthogonal electrodes.

A E Aubert, B N Goldreyer, M G Wyman

    The American Journal of Cardiology
    |March 1, 1987
    PubMed
    Summary

    Orthogonal noncontacting electrodes significantly improve atrial electrogram sensing compared to standard tip electrodes. This enhances P-wave detection and QRS rejection for critical atrial sensing applications.

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    Medical engineering & physics·2011

    Area of Science:

    • Biomedical Engineering
    • Electrophysiology
    • Medical Device Technology

    Background:

    • Accurate atrial electrogram sensing is crucial for cardiac device function.
    • Traditional pacing leads use tip electrodes for myocardial contact sensing.
    • Limitations exist in distinguishing atrial signals from ventricular signals with current methods.

    Purpose of the Study:

    • To compare the sensing characteristics of orthogonal noncontacting electrodes versus standard tip electrodes.
    • To evaluate P-wave amplitude, slew rate, and frequency content for both electrode types.
    • To determine the efficacy of orthogonal electrodes for improved atrial sensing.

    Main Methods:

    • Simultaneous recording of atrial electrograms from 11 patients using two pacing leads.

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  • Comparison of data from solid tip/target tip electrodes and orthogonal electrodes in the right atrial appendage.
  • Analysis of P-wave and QRS amplitudes, slew rates, and spectral content.

    • Main Results:

    • No significant difference in P-wave or QRS characteristics between solid tip and target tip electrodes.
    • Orthogonal electrodes demonstrated significantly higher P-wave amplitude (6.1 mV vs. 3.0-3.1 mV) and slew rate (1 V/s vs. 0.4-0.6 V/s).
    • Orthogonal electrodes showed superior P-wave frequency content (34 Hz vs. 8-9 Hz) and better QRS rejection (0.13 mV vs. 1.0-1.2 mV).

    Conclusions:

    • Orthogonal noncontacting sensing electrodes provide substantially better P-wave amplitude detection.
    • These electrodes offer superior QRS rejection compared to contacting tip electrodes.
    • Orthogonal electrodes represent a significant advancement for applications requiring discriminate atrial sensing.