Definitions for sick sinus syndrome
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Sick sinus syndrome
Sick sinus syndrome, also called sinus node dysfunction, is an umbrella term for a group of abnormal heart rhythms presumably caused by a malfunction of the sinus node, the heart's primary pacemaker. Bradycardia-tachycardia syndrome is a variant of sick sinus syndrome in which slow arrhythmias and fast arrhythmias alternate. In recent years, the syndrome has become increasingly prevalent in dogs. The reason is unknown.
U.S. National Library of Medicine
Sick Sinus Syndrome
A condition caused by dysfunctions related to the SINOATRIAL NODE including impulse generation (CARDIAC SINUS ARREST) and impulse conduction (SINOATRIAL EXIT BLOCK). It is characterized by persistent BRADYCARDIA, chronic ATRIAL FIBRILLATION, and failure to resume sinus rhythm following CARDIOVERSION. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects.
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"sick sinus syndrome." Definitions.net. STANDS4 LLC, 2014. Web. 25 Jul 2014. <http://www.definitions.net/definition/sick sinus syndrome>.