Sick sinus syndrome: The sinus node does not fire its signals properly, so that the heart rate slows down. Sometimes the rate changes back and forth between a slow (bradycardia ... more about Sick sinus syndrome.
Sick sinus syndrome: Heart rhythm disorder. More detailed information about the symptoms, causes, and treatments of Sick sinus syndrome is available below.
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The sinus node does not fire its signals properly, so that the heart rate slows down. Sometimes the rate changes back and forth between a slow (bradycardia) and fast (tachycardia) rate. (Source: excerpt from NHLBI, Arrhythmia: NHLBI)
Dysfunction of the sinoatrial node manifested by persistent sinus bradycardia, sinus arrest, sinoatrial exit block, chronic atrial fibrillation and inability of the heart to resume sinus rhythm following cardioversion for atrial fibrillation. - (Source - Diseases Database)
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