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Sick sinus syndrome is a type of heart rhythm disorder. It affects the heart's natural pacemaker (sinus node), which controls the heartbeat. Sick sinus syndrome causes slow heartbeats, pauses (long periods between heartbeats) or irregular heartbeats (arrhythmias).
Coronary heart disease, high blood pressure, and aortic and mitral valve diseases may occur with sick sinus syndrome. However, these diseases may have nothing to do with the syndrome. Sick sinus syndrome is uncommon, but not rare. It is the most common reason people need to have an artificial pacemaker implanted.
Per definition, sinus node dysfunction should include symptoms and EKG findings simultaneously such as sinus bradycardia, sinus pauses or arrest, sinus exit blocks, or chronotropic incompetence (inadequate heart rate response to activity).
SND may also manifest as chronotropic incompetence with inappropriate heart rate responses to physiologic demands during activity. SND can also be accompanied by AV nodal conduction disturbances and by atrial tachyarrhythmias as part of the tachycardia-bradycardia syndrome.
If the sinus node is not functioning normally ? due to damage from surgery, drugs, congenital heart defects or other causes ? the heartbeat may become very slow with a decrease in blood pressure. Sinus node dysfunction may lead to an abnormally slow heart rhythm called bradycardia.