Sick Sinus Syndrome (SSS)

Sick Sinus Syndrome (SSS) is a condition that affects the heart's natural pacemaker, called the sinus node, which controls the heart's rhythm. This disorder causes the heart to beat too slowly, pause irregularly, or sometimes beat too fast, leading to symptoms like dizziness, fatigue, and fainting. The heart is part of the cardiovascular system, and its proper rhythm is essential for pumping blood effectively throughout the body. When the sinus node malfunctions, the heart cannot maintain a steady rhythm, which can reduce blood flow to vital organs. This condition often occurs in older adults and can significantly impact daily activities and overall health.

Sick Sinus Syndrome (SSS) is a group of arrhythmias caused by dysfunction of the sinus node, the heart's primary pacemaker located in the right atrium. The core pathology involves impaired automaticity or conduction within the sinus node, often due to fibrosis, ischemia, or degenerative changes. This leads to inappropriate sinus bradycardia, sinus pauses or arrest, and sometimes alternating bradycardia and tachycardia (tachy-brady syndrome). The usual mechanism is intrinsic sinus node disease, but it can also be caused by extrinsic factors such as medications or autonomic dysfunction. Clinically, SSS is significant because it can cause syncope, heart failure, and increased risk of thromboembolism due to atrial arrhythmias. Diagnosis and management are critical to prevent complications and improve quality of life.