Heart block

Heart block is a condition where the heart's electrical signals are slowed or disrupted as they move through the heart. This can lead to a slow or irregular heartbeat, known as bradycardia or arrhythmia respectively.

Right bundle branch block (RBBB) of the human heart

Types of Heart Block

There are three main types of heart block:

1. First-degree heart block: This is the mildest form of heart block. In this condition, the electrical signals are slowed as they move from the heart's upper chambers (the atria) to the lower chambers (the ventricles). This rarely causes symptoms and usually does not require treatment.
2. Second-degree heart block: In this condition, some signals from the atria do not reach the ventricles. This can cause the heart to beat irregularly and often more slowly than normal, which can result in symptoms such as fatigue, dizziness, or fainting. Treatment may include medication or a pacemaker.
3. Third-degree heart block: This is the most serious type of heart block. In this condition, none of the electrical signals from the atria reach the ventricles. This can cause the heart to beat very slowly or even stop, which can be life-threatening. Treatment usually involves the immediate installation of a pacemaker.

Causes of Heart Block

Heart block can be caused by several factors, including:

• Heart disease
• Heart attack
• Cardiomyopathy
• Certain medications
• Genetic conditions

Symptoms of Heart Block

Symptoms of heart block can vary depending on the type and severity of the condition. They may include:

• Fatigue
• Dizziness or fainting
• Shortness of breath
• Chest pain
• Palpitations

Diagnosis of Heart Block

Heart block is usually diagnosed through an electrocardiogram (ECG), which records the electrical activity of the heart. Other tests may include a Holter monitor, which records the heart's activity over a 24-hour period, or an exercise stress test, which monitors the heart's activity while the patient exercises.

Treatment of Heart Block

Treatment of heart block depends on the type and severity of the condition. It may include:

• Monitoring: For mild cases of heart block, no treatment may be necessary. However, regular check-ups will be needed to monitor the condition.
• Medication: Certain medications can help regulate the heart's rhythm.
• Pacemaker: For more severe cases of heart block, a pacemaker may be needed. This small device is implanted under the skin and sends electrical signals to the heart to help it beat regularly.

See Also

• Cardiology
• Electrocardiogram
• Pacemaker

Heart block Resources
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