Sick sinus syndrome (SSS) is a heterogeneous disorder consisting of abnormalities of supraventricular impulse generation and conduction that produce a wide variety of intermittent supraventricular tachy- and bradydysrhythmias. The tachydysrhythmias are usually atrial fibrillation, junctional tachycardia, reentrant SVT, and atrial flutter. The bradydysrhythmias are marked sinus bradycardia, prolonged sinus arrest, and sinoatrial block, usually associated with AV nodal conduction abnormalities and inadequate AV junctional escape rhythms.
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