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Related Experiment Videos

Isorhythmic Dissociation--a "physiological" arrhythmia

E Kaplinsky, R Aronson, H N Neufeld

    Journal of Electrocardiology
    |April 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

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    Isorhythmic dissociation (IRD) involves the sino-atrial mechanism and is sustained by the baroreceptor reflex arc. This study observed that IRD occurs when atrial and ventricular rates are similar, influencing blood pressure.

    Area of Science:

    • Cardiology
    • Physiology
    • Electrophysiology

    Background:

    • Isorhythmic dissociation (IRD) is an arrhythmia where atrial and ventricular rhythms are nearly identical.
    • The sino-atrial mechanism's behavior during IRD, especially its relation to the baroreceptor reflex, requires further elucidation.

    Purpose of the Study:

    • To investigate the behavior of the sino-atrial mechanism during spontaneous and pacemaker-induced isorhythmic dissociation.
    • To determine the role of the baroreceptor reflex arc in sustaining IRD.

    Main Methods:

    • Studied 21 patients with spontaneous or pacemaker-induced IRD.
    • Measured successive P-P, R-R, and P-R intervals and blood pressure fluctuations.
    • Graphically interrelated cardiovascular parameters during control and IRD states.

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    Main Results:

    • IRD occurred when atrial and ventricular rates were closely matched.
    • Oscillations in atrial rate correlated with blood pressure fluctuations during IRD.
    • Sinus rate exhibited marked oscillations during IRD, unlike its stability in other conditions.

    Conclusions:

    • The findings support the theory that the baroreceptor reflex arc sustains isorhythmic dissociation.
    • IRD is influenced by the proximity of atrial and ventricular rates and baroreceptor activity.