Heart Block: Symptoms, Causes, Diagnosis & Treatment

Written by Medicover Team and Medically Reviewed by Dr Kuldeep R Totawar , Cardiologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Heart block, also known as atrioventricular (AV) block, is a heart rhythm disorder in which the electrical signals between the heart's upper and lower chambers are delayed or blocked. Depending on its severity, it may cause dizziness, fatigue, fainting, shortness of breath, or no symptoms at all. Early diagnosis and appropriate treatment, including medications or a pacemaker when needed, help restore normal heart function and prevent complications.

What Are the Types of Heart Block?

Heart block is classified according to the degree of disruption in electrical signal conduction.

First-Degree Heart Block: Electrical signals are slowed but still reach the ventricles.
Second-Degree Heart Block (Mobitz Type I and Type II): Some electrical signals fail to reach the ventricles, resulting in missed heartbeats.
Third-Degree (Complete) Heart Block: No electrical signals pass from the atria to the ventricles, causing the ventricles to beat independently.

What Are the Symptoms, or Warning Signs of Heart Block?

The symptoms of heart block can vary depending on the type and severity of the condition. Common symptoms include:

Mild Symptoms

Fatigue: Feeling unusually tired.
Dizziness: Lightheadedness or feeling faint.
Palpitations: Irregular or skipped heartbeats.

Severe Symptoms

Syncope: Fainting or near-fainting spells.
Chest Pain: Discomfort or pain in the chest.
Shortness of Breath: Shortness of breath, especially during physical activity.
Bradycardia: Abnormally slow heart rate.

What Are the Common Causes of Heart Block?

Heart block can be caused by various factors, including congenital conditions, diseases, and external influences. Understanding these causes is essential for diagnosis and treatment.

Congenital Causes

Some individuals are born with heart block due to genetic factors or developmental abnormalities. This is known as congenital heart block and can be associated with conditions such as:

Congenital Heart Disease: Structural defects in the heart present from birth.
Lupus: Autoimmune disease in the mother that can affect the fetus.

Acquired Causes

Acquired heart block develops later in life and can result from a range of conditions, including:

Coronary Artery Disease: Reduced blood flow to the heart muscle.
Myocardial Infarction ( Heart Attack ): Damage to the heart muscle affects electrical signal transmission.
Cardiomyopathy: Disease of the heart muscle.
Myocarditis : Inflammation of the heart muscle.
Degenerative Diseases: Age-related changes in the heart's electrical system.
Surgical Procedures: Damage to the electrical pathways during heart surgery.
Medications: Certain drugs can interfere with electrical signal transmission.

When to See a Doctor for Heart Block?

Consult a cardiologist if you experience a slow heartbeat, dizziness, fainting, chest discomfort, or unexplained fatigue. Early diagnosis and treatment can prevent serious complications, including heart failure and sudden cardiac arrest.

You should see a doctor if you have:

Persistent dizziness or lightheadedness
A slow or irregular heartbeat
Repeated fainting episodes
Unexplained fatigue or shortness of breath

Get medical help immediately if:

Loss of consciousness
Severe chest pain or pressure
Difficulty breathing
Sudden collapse or signs of cardiac arrest

These could indicate severe heart block or another life-threatening cardiac emergency requiring urgent medical care.

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How is Heart Block Diagnosed?

Accurate diagnosis of heart block is essential for effective treatment. Several diagnostic tools and procedures are used to identify and assess the condition.

Electrocardiogram (ECG or EKG)

An ECG is the primary tool for diagnosing heart block. It records the electrical activity of the heart and can reveal abnormalities in the signal pathways.

Holter Monitor

A Holter monitor is a portable device worn for 24 to 48 hours to continuously record the heart's electrical activity. It helps detect intermittent heart block episodes.

Event Recorder

Similar to a Holter monitor, an event recorder is worn for longer periods, usually up to 30 days. It records heart activity when the patient activates it during symptoms.

Electrophysiological Study (EPS)

An EPS is an invasive procedure where catheters are inserted into the heart to map the electrical pathways. It helps pinpoint the exact location of the block.

What Are the Treatment Options for Heart Block?

The treatment for heart block depends on the type and severity of the condition. Options range from monitoring and medication to surgical interventions.

Medications

For mild cases of heart block, medications may be prescribed to manage symptoms and underlying conditions. These can include:

Beta-Blockers: Help control heart rate and rhythm.
Calcium Channel Blockers: Manage high blood pressure and heart rhythm.
Antiarrhythmic Drugs: Prevent irregular heartbeats.

Pacemaker Implantation

In cases of severe heart block, a pacemaker may be required. A pacemaker is a small device implanted under the skin that sends electrical signals to regulate the heartbeat. Types of pacemakers include:

Single-chamber Pacemaker: Regulates the heartbeat in one chamber of the heart.
Dual-chamber Pacemaker: Coordinates the timing between the atria and ventricles.
Biventricular Pacemaker (CRT): Used for heart failure patients to improve the efficiency of the heart's pumping action.

Lifestyle and Activity Adjustments

Patients with heart block may need to make lifestyle and activity adjustments to manage their condition. These can include:

Regular Monitoring: Keeping track of heart rate and symptoms.
Avoiding Strenuous Activities: Limiting activities that place excessive strain on the heart.
Following Medical Advice: Adhering to prescribed treatment plans and attending follow-up appointments.

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How Can Heart Block Be Prevented?

While some causes of heart block cannot be prevented, certain lifestyle changes and medical interventions can reduce the risk.

Lifestyle Modifications

Healthy Diet: Eating a balanced diet rich in fruits, vegetables, and whole grains.
Regular Exercise: Engaging in physical activity to maintain cardiovascular health.
Avoiding Tobacco: Quitting smoking and avoiding secondhand smoke.
Managing Stress: Practicing stress-reduction techniques such as meditation and yoga.

Medical Interventions

Medication Management: Regular monitoring and adjustment of medications that may affect heart function.
Treating Underlying Conditions: Managing conditions like hypertension, diabetes, and coronary artery disease.
Regular Check-Ups: Routine medical exams to monitor heart health and detect issues early.