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Related Experiment Videos

Low voltage electrical activity preceding right atrial depolarisation in man.

A F Mackintosh, M J English, R Vincent

    British Heart Journal
    |August 1, 1979
    PubMed
    Summary

    Researchers detected early electrical signals in the high right atrium before atrial depolarization. This low-voltage activity, potentially from the sinus node, was observed in most patients during cardiac catheterization.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Signal Processing

    Background:

    • Conventional electrocardiography (ECG) records atrial activity.
    • Understanding the precise electrical activation sequence in the atrium is crucial for diagnosing arrhythmias.

    Purpose of the Study:

    • To investigate low-voltage electrical activity in the high right atrium preceding atrial depolarization.
    • To explore the potential origin of these early signals, possibly related to the sinus node.

    Main Methods:

    • High right atrial electrical recordings were obtained during cardiac catheterization.
    • Signals were filtered, amplified (3-10 million times), and processed using signal averaging in a digital computer.

    Main Results:

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  • Technically satisfactory recordings were achieved in 28 patients and 3 volunteers.
  • Low-voltage electrical activity preceding the conventionally-recorded atrial depolarization was observed in 23 subjects (82%).
  • This early activity commenced 50-200 ms before atrial deflection and exhibited variable morphology.

    • Conclusions:

    • The detected low-voltage signals represent a distinct electrical event in the high right atrium.
    • These findings suggest that the observed activity may originate from the sinus node region.
    • This technique could offer new insights into atrial electrophysiology and sinus node function.