Sick sinus syndrome is common in elderly people. It is caused by a disease sinus (SA) node. It can result in various arrhythmias including sinus bradycardia, sinus arrest, SA block, alternating with sinus tachycardia, atrial tachycardia, atrial flutter or atrial fibrillation. The slow rhythms often require a pacemaker, while the fast rhythms often require medications (e.g. beta blockers).See also: Syndromes
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