Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Syndrome, sick sinus
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Syndrome, sick sinus: Symptoms of dizziness, confusion, fainting, and heart failure due to a problem with the sinus node of the heart, which acts as the body's natural pacemaker. If the sinus node is not functioning normally, it is reflected in an abnormally slow heart rate (bradycardia). This can cause poor pumping by the heart, which can impair the circulation.
Diagnosis is usually by electrocardiogram (EKG). Treatment includes medications, such as the class of drugs called calcium antagonists.