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Prognosis of sinus node dysfunction is mixed; without treatment, mortality is about 2%/year, primarily resulting from an underlying structural heart disorder. Each year, about 5% of patients develop AF with its risks of heart failure and stroke.
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.
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).
Sinus node dysfunction, also known by its historical name sick sinus syndrome, is the inability of the SA node to produce an adequate heart rate that meets the physiologic needs of the individual.
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.