Definitions for "Sick sinus syndrome"
abnormal functioning of the structure that regulates the heartbeat, causing episodes of abnormal heart rhythm
The failure of the sinus node to regulate the heart's rhythm.
A disorder in the heart's sinus node that affects how heartbeats are generated and how they are conducted. It usually causes a slow heart rate that may cause a person to faint. A related disorder is bradycardia-tachycardia syndrome, which involves alternating bouts of fast and slow rhythms.