Third-degree atrioventricular (AV) block, also known as complete heart block, is a type of heart block that occurs when the conduction of electrical signals from the atria to the ventricles is completely impaired. This means that the electrical signals from the atria are not able to reach the ventricles, and the ventricles do not contract in response. As a result, the heart may not be able to pump blood effectively, leading to symptoms such as dizziness, fainting, and fatigue.

Diagnosis of third-degree AV block typically involves a physical exam, electrocardiogram (ECG), and possibly other tests such as an echocardiogram or stress test.

Treatment for third-degree AV block may include the use of a pacemaker to regulate the heart rhythm and ensure that the heart is able to pump blood effectively. In some cases, surgery may be necessary to repair the underlying problem causing the heart block.

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