When your heart's natural pacemaker isn't working properly, your heart can't perform as efficiently as it should. This can lead to a very slow heart rate, which may cause fainting.
In rare cases, long periods of slow heart rate or fast heart rate can keep your heart from pumping enough blood to meet your body's needs — a condition called heart failure.
If you have a type of sick sinus syndrome called bradycardia-tachycardia syndrome, you also may be at a higher risk of developing a blood clot in your heart that may lead to a stroke. That's because the fast heart rhythm that occurs in bradycardia-tachycardia syndrome is often atrial fibrillation.
Atrial fibrillation is a chaotic rhythm of the upper chambers of the heart that can cause blood pooling in the heart. Blood clots are more likely to form when blood flow through the heart is altered in any way. A blood clot can break loose and travel to the brain, causing a stroke.
May 13, 2014
- Zipes DP, et al. Cardiac Elecrophysiology: From Cell to Bedside. 6th ed. Philadelphia, Pa.: Saunders Elsevier; 2014. http://www.clinicalkey.com. Accessed Jan. 8, 2014.
- Sinus node dysfunction. The Merck Manuals: The Merck Manual for Health Care Professionals. http://www.merckmanuals.com/professional/cardiovascular_disorders/arrhythmias_and_conduction_disorders/sinus_node_dysfunction.html. Accessed Jan. 8, 2014.
- Lau CP, et al. Prospective randomized study to assess the efficacy of site and rate of atrial pacing on long-term progression of atrial fibrillation in sick sinus syndrome: Septal pacing for atrial fibrillation suppression evaluation (SAFE) study. Circulation. 2013;128:687.
- Cheng A. Diagnosis and evaluation of the sick sinus syndrome. http://www.uptodate.com/home. Accessed Jan. 8, 2014.
- Cheng A. Manifestations and causes of the sick sinus syndrome. http://www.uptodate.com/home. Accessed Jan. 8, 2014.
- Semelka M, et al. Sick sinus syndrome: A review. American Family Physician. 2013;87:691.
- What is a pacemaker? National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/health-topics/topics/pace/. Accessed Jan. 8, 2014.
- Tracy CM, et al. 2012 ACCF/AHA/HRS focused update incorporated into the ACCF/AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities. Journal of the American College of Cardiology. 2013;61:e6.
- Non-surgical procedures for atrial fibrillation (Fib or AF). American Heart Association. http://www.heart.org/HEARTORG/Conditions/Arrhythmia/AboutArrhythmia/Non-surgical-Procedures-for-Atrial-Fibrillation-Fib-or-AF_UCM_423782_Article.jsp. Accessed Jan. 8, 2014.
- Your guide to a healthy heart. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/public/heart/other/your_guide/yg_hh.htm. Accessed Jan. 8, 2014.