Sick sinus syndrome (sinus node dysfunction) is a heart rhythm condition that happens because your sinoatrial node (SA node) isn’t working right. When this pacemaker-like node can’t keep a …

Sinus node dysfunction can be caused by intrinsic and extrinsic factors that affect the normal functioning of the sinus node. Intrinsic causes can include degeneration, dysfunction, or …

Sinus node dysfunction affects mainly older adults, especially those with another heart disorder or with diabetes. The most common cause is formation of scar tissue (fibrosis) in the sinus node.

Sinus node dysfunction, previously known as sick sinus syndrome, is characterized by abnormal initiation and propagation of electrical impulses from the sinoatrial node (SAN).

Jul 4, 2023 · 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 …

Jul 18, 2025 · Abnormal results associated with sinus node dysfunction, such as chronotropic incompetence, may complicate the diagnosis.

Apr 29, 2025 · SND causes symptoms such as fatigue, dyspnea on exertion, lightheadedness, presyncope, and syncope. The clinical manifestations and diagnosis of SND will be reviewed …

Oct 8, 2024 · Commonly seen in the elderly but sinus node dysfunction can affect all age groups. Symptoms are due to decreased cardiac output and end-organ hypoperfusion associated with …

May 25, 2023 · What Is Sick Sinus Syndrome? The heart has a natural pacemaker that regulates its heartbeat called the sinus node. When this sinus node does not function correctly, the …

Apr 30, 2022 · 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 …