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Sick Sinus Dysfunction - Dysfunction of the Sinus Node

Written by
Dr. Isaac Gana
and medically reviewed by iCliniq medical review team.

Published on Apr 06, 2017 and last reviewed on Sep 07, 2018   -  2 min read



The article is about the dysfunction of the sinus node, its causes, presenting symptoms, ways to diagnose, and treatment.

Sick Sinus Dysfunction - Dysfunction of the Sinus Node

The sinus node is a structure located in the upper part of the right side of the heart, which serves as the heart's pacemaker. Electrical impulses are produced there and travel from the sinus node down to the ventricles, that is the lower part of the heart.

What Is Sick Sinus Dysfunction?

Sick sinus dysfunction is the inability of the sinus node to perform its duty of sending the right amount of electrical impulses to the other parts of the heart. It is commonly presented in three forms:

  1. Tachy-Brady syndrome: A situation where there is an either too fast heartbeat or too slow heartbeat.
  2. SA (sinoatrial) nodal exit block: The duration of the impulse traveling is increased because of blockage. It could be partial or total, like in the case of AV (atrioventricular) block.
  3. Sinus arrest: Is when there is prolonged blockage, leading to the absence of an impulse.

This disease is more common amongst older adults.

What Are the Causes of Sick Sinus Dysfunction?

  1. Long years of poorly managed arterial hypertension.
  2. It could occur after undergoing heart surgery.
  3. Old age, because in elder people, there is degeneration of tissues of the heart.
  4. Diseases like amyloidosis and sarcoidosis.
  5. Prior history of a heart attack.
  6. Hypothyroidism.

What Are the Presenting Signs and Symptoms?

  1. Dizziness.
  2. Shortness of breath.
  3. Fast or slow heart rate.
  4. Syncope or lightheadedness.
  5. Weakness.

What Are the Tests Necessary to Diagnose This Disease?

Ways to Treat Sick Sinus Syndrome.

For more information consult a cardiac arrhythmia specialist online -->


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Last reviewed at:
07 Sep 2018  -  2 min read


Dr. Isaac Gana

Dr. Isaac Gana

Cardiology Speciality

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