About Heart Block

Overview

Heart block, also known as a conduction disorder, is a type of arrhythmia where the electrical signals in the heart do not function properly. Normally, electrical signals travel from the upper chambers (atria) to the lower chambers (ventricles) through a group of cells called the AV node. However, in heart block, these signals are delayed, disrupted, or completely obstructed along their pathway. There are different degrees of heart block, ranging from first-degree (least serious) to third-degree (most serious). Heart block can cause symptoms such as lightheadedness, fainting, and palpitations. In severe cases, it can be life-threatening. Treatment options may include lifestyle changes, medication, or a pacemaker. It is important to adopt a heart-healthy diet and lifestyle to help prevent the development of heart block.

Causes and Risk Factors

The causes of heart block can include:

• Fibrosis of the heart: This is a normal process of aging where the heart's tissues become stiff and less flexible, which can interfere with the conduction of electrical signals.
• Medications: Certain medications can cause heart block as a side effect.
• Infection: Infections of the heart tissue can disrupt the normal electrical pathways.

The non-modifiable risk factors for heart block cannot be changed or controlled. These include:

• Increasing age
• Genetic factors: Having a positive family history of heart block or related cardiac conditions can increase your risk.
• Congenital conditions: In rare cases, heart block can be present from birth and may be associated with autoimmune disorders in the mother.

The modifiable risk factors for heart block can be influenced or changed. These include:

• High blood pressure
• Elevated blood glucose levels (elevated blood sugar)

It's important to note that while these modifiable factors are associated with a higher risk of developing heart block, they do not directly cause it. It's always best to consult with a healthcare professional for personalized advice on managing these risk factors.

Symptoms

The most common early symptoms of heart block include:

• Feeling more tired than usual
• Chest discomfort (angina)
• Difficulty breathing, especially during physical activity
• Lightheadedness or dizziness

As heart block progresses or reaches a higher severity, the following symptoms may occur:

• Chest pain that occurs even at rest or during minimal activities
• Fainting or syncope
• Very slow pulse or no pulse
• Shortness of breath
• Nausea
• Heart palpitations (feeling as though the heart is skipping a beat)

It's important to note that some people with a milder form of heart block may not experience any symptoms. If you have any symptoms of heart block, it's essential to seek medical attention for proper diagnosis and management.

Diagnosis

To diagnose heart block, the following examinations, tests, and procedures are commonly performed:

• Medical history: The doctor will ask about your symptoms, medical history, and any risk factors.
• Physical exam: The doctor will perform a physical exam, including listening to your heart for any abnormalities.
• Electrocardiogram (ECG): This test records the electrical activity of your heart and can help diagnose heart block by detecting abnormal wave patterns.
• Holter monitor: This portable device records your heart's electrical activity over a period of 24 to 48 hours while you go about your normal activities.
• Cardiac event monitor: Similar to a Holter monitor, this device records your heart's electrical activity over a longer period, usually up to 12 days.

To determine the degree or severity of heart block, additional examinations, tests, and procedures may be performed:

• Echocardiogram: This test uses sound waves to create images of your heart and can assess its structure and function.
• Stress test: This involves exercising on a treadmill or stationary bike while your heart is monitored to evaluate its response to physical activity.
• Electrophysiology study: This invasive procedure involves inserting catheters into your blood vessels to measure the electrical activity in your heart and identify the location of the blockage.

Remember that these tests and procedures should be conducted by a healthcare professional. They will evaluate the results and provide an accurate diagnosis and assessment of heart block.

Treatment Options

The goals of treatment for heart block are to restore a healthy heart rate and rhythm, improve symptoms, and prevent complications. Here are the recommended treatments and how they work to achieve these goals:

Medications:

• Atropine: This medication restores healthy electrical activity in the heart and improve heart rhythm.
• Blood thinners
• Pain relievers
• Cholesterol lowering medications
• Blood pressure medications

Therapeutic procedures:

• Angioplasty and stenting: Opens blocked arteries, improving blood flow to the heart
• Temporary pacemakers: Used to help restore the heart's rate and rhythm until the heart muscle recovers
• Permanent implantable pacemakers: These are often the solution for long-term management of heart block. They send electrical signals to maintain a steady heart rhythm.
• Bypass surgery: Creates alternate routes for blood flow, bypassing blocked arteries

Health behavior changes:

• Exercising regularly
• Following a heart-healthy diet
• Quitting smoking
• Managing stress

It's important to remember that treatment plans should be individualized based on each person's specific condition. Consult with your healthcare professional for personalized advice.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Other side effects can occur. Check with your health care professional or read the information provided with your medication for additional side effect information.