Third-degree heart block

Third-degree heart block, also known as complete heart block, is a medical condition where the electrical signals from the heart's upper chambers (the atria) are not transmitted to the lower chambers (the ventricles). This results in an independent and usually slower ventricular rhythm.

Symptoms

The symptoms of third-degree heart block can vary greatly depending on the individual and the severity of the block. Some people may not experience any symptoms, while others may experience dizziness, fainting, shortness of breath, chest pain, or fatigue. In severe cases, third-degree heart block can lead to cardiac arrest or sudden cardiac death.

Causes

Third-degree heart block can be caused by a variety of factors. These include congenital heart disease, coronary artery disease, myocardial infarction, cardiomyopathy, Lyme disease, and certain medications. It can also be a complication of heart surgery.

Diagnosis

Diagnosis of third-degree heart block typically involves an electrocardiogram (ECG), which can show the independent atrial and ventricular rhythms characteristic of the condition. Other tests may include a Holter monitor, event monitor, or electrophysiology study.

Treatment

Treatment for third-degree heart block usually involves the implantation of a pacemaker, a device that sends electrical signals to the heart to help it maintain a normal rhythm. In some cases, medication may be used to manage symptoms or treat underlying conditions.

See also

• First-degree heart block
• Second-degree heart block
• Cardiac arrhythmia
• Electrophysiology

References

Third-degree heart block Resources
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