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Sick Sinus Syndrome
Definition 1
A constellation of signs and symptoms which may include syncope, fatigue, dizziness, and alternating periods of bradycardia and atrial tachycardia, which is caused by sinoatrial node dysfunction. (NCI Thesaurus)
Definition 2
A disorder characterized by a dysrhythmia with alternating periods of bradycardia and atrial tachycardia accompanied by syncope, fatigue and dizziness. (NCI Thesaurus/CTCAE)
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