Conduction Disorders: Causes, Diagnosis & Treatment

Written by Medicover Team and Medically Reviewed by Dr Pabba Anish , Cardiologists

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

Conduction disorders occur when the electrical impulses that coordinate heartbeats are delayed or blocked. This can lead to arrhythmias, where the heart beats too fast, too slow, or irregularly. The heart's conduction system includes the sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, and Purkinje fibers, all of which play a pivotal role in maintaining a normal cardiac rhythm.

What are the Types of Conduction Disorders?

There are several types of conduction disorders, each affecting different parts of the heart's electrical pathway.

Atrioventricular (AV) Block: Occurs when electrical conduction between the atria and ventricles is impaired. It is classified into first-, second-, and third-degree AV block depending on the severity.
Bundle Branch Block: Involves a delay or blockage in the electrical pathway that carries impulses to the left or right ventricle. It may affect the right bundle branch (RBBB) or left bundle branch (LBBB).
Sick Sinus Syndrome: A group of rhythm disorders caused by malfunction of the sinoatrial (SA) node, leading to irregular heartbeats.
Wolff-Parkinson-White Syndrome: A condition caused by an extra electrical pathway between the atria and ventricles, resulting in episodes of rapid heart rate.

What are the Causes of Conduction Disorders?

Conduction disorders can develop due to several medical conditions and factors that interfere with the heart's electrical system.

Coronary Artery Disease: Reduced blood flow damages the heart's conduction pathways.
Myocardial Infarction (Heart Attack): Scar tissue following a heart attack can interrupt electrical signal transmission.
Cardiomyopathy: Diseases affecting the heart muscle may alter the structure and function of the conduction system.
Electrolyte Imbalances: Abnormal potassium, calcium, or magnesium levels can disrupt normal heart rhythm.
Genetic Factors: Certain inherited disorders, such as Long QT syndrome, increase the risk of conduction abnormalities.
Medications: Some medicines that affect heart rhythm can cause conduction disturbances.
Aging: Degenerative changes in the heart's conduction system occur naturally with age.

What are the Symptoms of Conduction Disorders?

The symptoms of conduction disorders vary depending on the type and severity of the condition. Some individuals may have no symptoms, while others develop noticeable heart rhythm abnormalities.

Palpitations: Sensations of a rapid or irregular heartbeat.
Dizziness or Lightheadedness: Caused by reduced blood flow to the brain.
Shortness of Breath: Especially during physical activity.
Fatigue: Persistent tiredness due to reduced cardiac efficiency.
Chest Pain: May occur in some individuals with rhythm abnormalities.
Syncope: Temporary loss of consciousness caused by inadequate blood flow to the brain.

When to See a Doctor for Conduction Disorders?

Conduction disorders are conditions that affect the heart's electrical system, causing the heartbeat to become too slow, too fast, or irregular. While some conduction disorders may not cause noticeable symptoms, others can lead to serious complications such as fainting, heart failure, or cardiac arrest if left untreated.

If you experience symptoms of an abnormal heart rhythm or have risk factors for heart disease, consult a Cardiologist for a thorough evaluation and appropriate treatment.

Persistent or recurrent episodes of dizziness or lightheadedness.
Fainting (syncope) or unexplained loss of consciousness.
A slow, fast, or irregular heartbeat (palpitations).
Chest pain or discomfort associated with an abnormal heart rhythm.
Shortness of breath during activity or while at rest.
Unexplained fatigue or weakness that affects daily activities.
Difficulty exercising due to rapid exhaustion or heart-related symptoms.
Swelling in the legs, ankles, or feet accompanied by heart rhythm abnormalities.
A family history of conduction disorders, arrhythmias, or sudden cardiac death.
Severe chest pain, persistent fainting, or sudden collapse requiring immediate emergency medical attention.

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How are Conduction Disorders Diagnosed?

Diagnosing conduction disorders involves a detailed clinical evaluation along with specialized tests that assess the heart's electrical activity and structure.

Electrocardiogram (ECG)

An ECG is the primary diagnostic test used to record the electrical activity of the heart and identify conduction abnormalities and arrhythmias.

Holter Monitor

A Holter monitor is a portable ECG device worn for 24 to 48 hours to detect intermittent conduction abnormalities that may not appear during a routine ECG.

Event Recorder

An event recorder is used for patients with infrequent symptoms and records the heart's electrical activity when activated during an episode.

Electrophysiological Study (EPS)

An electrophysiological study is an invasive procedure that maps the heart's electrical pathways to identify the exact location and type of conduction disorder.

Echocardiogram

An echocardiogram uses ultrasound imaging to evaluate the heart's structure and function and detect conditions contributing to conduction disorders.

How are Conduction Disorders Treated?

Treatment depends on the underlying cause, severity of symptoms, and type of conduction disorder. The goal is to restore a normal heart rhythm and prevent complications.

Medications

Antiarrhythmic medications, beta-blockers, calcium channel blockers, and other medicines may be prescribed to control heart rhythm and relieve symptoms.

Pacemaker

A pacemaker may be implanted in patients with complete heart block or sick sinus syndrome to maintain a regular heartbeat.

Catheter Ablation

Catheter ablation is performed to eliminate abnormal electrical pathways responsible for certain conduction disorders, including Wolff-Parkinson-White syndrome.

Lifestyle Changes

Maintaining a heart-healthy lifestyle, limiting caffeine and alcohol intake, managing stress, exercising regularly, and eating a balanced diet can support heart function.