idiopathic degenerative disease (changes to the area of the heart around the sinus node that occur with aging)Ĭertain medications can make abnormal heart rhythms worse.What causes sick sinus syndrome is not completely understood, but we do know that disorders that cause scarring, degeneration, or damage to the heart can cause sick sinus syndrome. Of the three arrhythmias that fall under the term sick sinus syndrome, sinus bradycardia is the most common. The average age of a person with sick sinus syndrome is about 68. It is even less common in younger people. One study estimates that sick sinus syndrome occurs in about one in every 600 people with cardiovascular disease older than 65. How many people have it is hard to say because it often doesn't cause any symptoms and therefore many people may be living with it and not know it. Sick sinus syndrome is a relatively uncommon problem. In someone with sick sinus syndrome, these signals do not come at a steady pace. This group of specialized cells in the upper right chamber of the heart controls the heart's rhythm by sending electrical signals that tell the heart to beat. bradycardia-tachycardia, which causes alternating slow and fast heart rhythms.Ī problem with a part of the heart called the sinus node causes these arrhythmias. Types of tachycardias include atrial fibrillation, atrial flutter/ tachycardia, and supraventricular tachycardia
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