Heart Block

Heart block is a condition in which the electrical signals that control the heartbeat are delayed or blocked as they travel through the heart’s conduction system. Depending on the type and severity, heart block may cause no symptoms or may result in a slow heart rate, dizziness, fainting, and other cardiac symptoms.

At DHEE Hospitals Cardiology, heart block is evaluated using ECG, rhythm monitoring, and other cardiac investigations to determine the type and severity of the electrical conduction problem and whether treatment is required.

What Is Heart Block?

The heart has an electrical system that coordinates each heartbeat. Electrical signals normally travel from the atria to the ventricles through the atrioventricular node and specialised conduction pathways.

Heart block occurs when these signals are slowed or prevented from reaching the lower chambers of the heart normally.

Types of Heart Block

First-Degree Heart Block

In first-degree heart block, electrical signals reach the ventricles but take longer than usual to travel through the conduction system. It often causes no symptoms and may not require specific treatment.

Second-Degree Heart Block

In second-degree heart block, some electrical signals fail to reach the ventricles. It can occur in different forms, and the clinical significance depends on the specific type and the patient’s symptoms.

Third-Degree Heart Block

Third-degree, or complete, heart block occurs when electrical signals from the atria do not reach the ventricles normally. The ventricles then rely on a slower backup rhythm. This can significantly reduce the heart’s ability to maintain adequate blood flow and may require urgent treatment.

Symptoms of Heart Block

Some people with mild heart block have no symptoms. When symptoms occur, they may include:

  • Slow heartbeat
  • Fatigue or weakness
  • Dizziness or light-headedness
  • Fainting or near-fainting
  • Shortness of breath
  • Reduced exercise tolerance
  • Chest discomfort
  • Confusion in severe cases

Causes of Heart Block

Heart block can develop because of changes or damage to the heart’s electrical conduction system. Possible causes include:

  • Age-related changes in the conduction system
  • Coronary artery disease
  • Previous heart attack
  • Heart surgery
  • Cardiomyopathy
  • Heart inflammation
  • Certain medicines
  • Electrolyte abnormalities
  • Some congenital heart conditions

In some patients, the exact cause may not be identified.

How Is Heart Block Diagnosed?

Electrocardiogram

An ECG is the primary test used to identify heart block. It records the heart’s electrical activity and can help determine the type and severity of conduction abnormality.

Holter Monitoring

A Holter monitor records the heart rhythm continuously and can detect intermittent episodes of heart block that may not appear during a standard ECG.

Extended Rhythm Monitoring

Longer-term rhythm monitoring may be recommended when symptoms occur occasionally or when a conduction abnormality needs further evaluation.

Echocardiogram

An echocardiogram may be performed to evaluate the structure and function of the heart and identify underlying heart disease.

Blood Tests

Blood tests may help identify potentially reversible factors such as electrolyte abnormalities or thyroid disorders.

Heart Block Treatment

Treatment depends on the type of heart block, its cause, the patient’s symptoms, and the risk of progression.

Observation and Monitoring

Some mild forms of heart block, particularly when they cause no symptoms, may only require regular monitoring and follow-up.

Treatment of the Underlying Cause

If heart block is related to a reversible condition or a medicine, addressing the underlying cause may improve the conduction abnormality.

Pacemaker

A pacemaker may be recommended for certain patients with significant or symptomatic conduction problems. It delivers electrical impulses to help maintain an appropriate heart rate when the heart’s natural electrical system cannot do so reliably.

When Is Heart Block an Emergency?

Severe or complete heart block can cause a dangerously slow heart rate and inadequate blood flow. Seek emergency medical attention if a suspected heart rhythm problem is accompanied by fainting, severe dizziness, chest pain, severe shortness of breath, confusion, or sudden weakness.

Heart Block and Pacemakers

Not every patient with heart block requires a pacemaker. The need for a pacemaker depends on the specific type of conduction disorder, symptoms, ECG findings, and other clinical factors.

A cardiologist evaluates these factors before recommending permanent pacemaker implantation.

Living With Heart Block

Patients diagnosed with heart block should follow their cardiologist’s recommendations and attend regular follow-up appointments. Monitoring may be particularly important when the conduction abnormality has the potential to progress.

Patients should also inform their doctor about all medicines and supplements they are taking, as some medicines can affect heart rate or electrical conduction.

Can Heart Block Be Prevented?

Some causes of heart block cannot be prevented, particularly age-related changes in the heart’s conduction system. However, maintaining cardiovascular health can help reduce the risk of diseases that may damage the heart.

  • Control high blood pressure.
  • Manage cholesterol and diabetes.
  • Avoid smoking.
  • Maintain a healthy body weight.
  • Follow treatment for coronary artery disease and other heart conditions.
  • Take medicines only as prescribed.
  • Attend recommended cardiac check-ups.

Heart Block Care at DHEE Hospitals Cardiology

DHEE Hospitals Cardiology provides evaluation and management for patients with heart block and other electrical conduction disorders. Assessment may include ECG, Holter monitoring, extended rhythm monitoring, echocardiography, blood tests, and other cardiac investigations when required.

Treatment is planned according to the type of heart block, symptoms, underlying cause, and individual clinical needs. Patients who require device-based treatment may be evaluated for pacemaker therapy.

Frequently Asked Questions About Heart Block

Is heart block the same as a heart attack?

No. A heart attack occurs when blood flow to part of the heart muscle is blocked. Heart block is an electrical conduction problem that affects how signals travel through the heart.

Is first-degree heart block dangerous?

First-degree heart block often causes no symptoms and may not require specific treatment. Its significance depends on the patient’s overall heart health and other clinical findings.

Does complete heart block require a pacemaker?

Complete heart block often requires urgent evaluation and, in many cases, permanent pacing. The appropriate treatment depends on the clinical circumstances and underlying cause.

Can heart block get worse over time?

Some forms of heart block can progress, while others may remain stable. Regular cardiac evaluation helps determine whether monitoring or treatment is required.

Can medicines cause heart block?

Yes. Certain medicines can slow the heart rate or interfere with electrical conduction. A doctor should review medications when heart block is identified.