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Thirddegree heart block, also known as complete heart block, is a serious medical condition that affects the heart's electrical system, leading to a disruption in the normal rhythm of the heart. In a healthy heart, electrical signals travel from the atria (upper chambers) to the ventricles (lower chambers), coordinating the heartbeat and allowing the heart to pump blood effectively.

In thirddegree heart block, the electrical signals between the atria and ventricles are completely blocked. This means that the atria and ventricles beat independently of each other. The atria may maintain a normal rhythm, but the ventricles beat at a slower rate, often driven by a backup or escape pacemaker located lower in the heart. As a result, the heart may not pump enough blood to meet the body's needs, leading to symptoms such as dizziness, fatigue, fainting, and shortness of breath.

Thirddegree heart block can be caused by various factors, including:

1. *Heart diseases:* Such as myocardial infarction (heart attack), cardiomyopathy, or heart valve disorders can damage the heart's electrical system, leading to heart block.

2. *Aging:* Degeneration of the heart's electrical pathways is a common cause in older adults.

3. *Medications:* Certain medications, especially those used to treat heart conditions, can interfere with the heart's electrical signals.

4. *Infections:* Infections such as Lyme disease or rheumatic fever can damage the heart tissue, including the electrical pathways.

5. *Congenital heart defects:* Some individuals are born with abnormal heart structures that can lead to heart block.

The treatment for thirddegree heart block depends on the underlying cause and the severity of symptoms. In some cases, a temporary or permanent pacemaker may be implanted to regulate the heart's rhythm. A pacemaker is a small device placed under the skin, usually near the collarbone, that uses electrical pulses to prompt the heart to beat at a normal rate.

It's important for individuals with thirddegree heart block to receive appropriate medical care and monitoring, as untreated heart block can be lifethreatening. Regular followups with a healthcare provider and adherence to recommended treatments can significantly improve the quality of life for individuals living with this condition.