National Heart, Lung, and Blood Institute. Sick sinus syndrome quiz Take a quiz to find out if you have sick sinus syndrome. Permanent cardiac pacing: Overiew of devices and indications. Causes Treatment & prevention When to see a doctor References Sick sinus syndrome is a condition in which the normal pacemaker of the heart is unable to keep the heart beating at a normal rate to deliver blood to the body. Journal of the American College of Cardiology. 2018 ACC/AHA/HRS guideline on the evaluation and management of patients with bradycardia and cardiac conduction delay: A report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society. In: Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. Sinus node dysfunction: Clinical manifestations, diagnosis, and evaluation. Sinus node dysfunction: Epidemiology, etiology, and natural history. In: Clinical Arrhythmology and Electrophysiology: A Companion to Braunwald's Heart Disease. The heart rate alternates between unusually slow and fast rhythms, often with a long pause between heartbeats. The heart rate is within regular range at rest but doesn't increase as much as it should with physical activity. Signals to the upper heart chambers are slowed or blocked, causing pauses or skipped beats. Signals from the sinus node pause, causing skipped beats. The sinus node produces a slow heartbeat. Neuromuscular diseases, such as muscular dystrophy.Medications to treat irregular heartbeats (arrhythmias).Medications to treat high blood pressure, including calcium channel blockers and beta blockers.Inflammatory diseases affecting the heart.Damage to the sinus node or scarring from heart surgery.Age-related wear and tear of heart tissues.Sick sinus syndrome is relatively uncommon, but the risk of developing it increases with age.Ĭauses of sick sinus node syndrome can include: The heartbeat can be too fast, too slow, interrupted by long pauses - or an alternating combination of these rhythm issues. In sick sinus syndrome, the electrical signals are irregularly paced.
The pace changes depending on activity, emotions and other factors. Typically, the sinus node creates a steady pace of electrical impulses. From the sinus node, electrical signals travel across the atria to the ventricles, causing them to contract and pump blood to the lungs and body. This natural pacemaker produces electrical signals that trigger each heartbeat.
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