• Sinus node dysfunction is an abnormality in the natural pacemaker of the heart that causes a slow heart rate.

    People may have no symptoms, or they may feel weak or tired or have palpitations.
    Electrocardiography is used to make the diagnosis.
    A permanent artificial pacemaker is usually needed.

    (See also Overview of Abnormal Heart Rhythms.)
    Dysfunction of the heart’s natural pacemaker (the sinus or sinoatrial node) may result in a persistently slow heartbeat (sinus bradycardia) or complete cessation of normal pacemaker activity (sinus arrest—see figure Tracing the Heart


    Sinus node dysfunction meaning & definition 1 of Sinus node dysfunction.

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