Bifascicular block

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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W8MD medical weight loss NYC and sleep center NYC

Bifascicular block
Synonyms
Pronounce	N/A
Specialty	N/A
Symptoms	Syncope, dizziness, palpitations
Complications	Complete heart block, sudden cardiac death
Onset
Duration
Types	Right bundle branch block with either left anterior fascicular block or left posterior fascicular block
Causes	Coronary artery disease, hypertension, cardiomyopathy, myocardial infarction
Risks
Diagnosis	Electrocardiogram (ECG)
Differential diagnosis	Trifascicular block, complete heart block
Prevention
Treatment	Pacemaker implantation if symptomatic
Medication
Prognosis	Variable, depends on underlying cause and presence of symptoms
Frequency
Deaths

Bifascicular block is a cardiological condition characterized by blockage of two of the three main fascicles in the heart's conduction system. These include the left anterior fascicle, the left posterior fascicle, and the right bundle branch.

Introduction

In a bifascicular block, two of the three main fascicles, or branches, of the heart's electrical conduction system are blocked. This can lead to a delay or complete blockage of the electrical signals that control the heart's rhythm. The condition can be asymptomatic or it can cause symptoms such as dizziness, fainting, or heart failure.

Causes

Bifascicular block can be caused by a variety of conditions, including coronary artery disease, myocardial infarction, cardiomyopathy, and hypertension. It can also be a result of aging or damage to the heart from surgery or other medical procedures.

Diagnosis

Diagnosis of bifascicular block is typically made through an electrocardiogram (ECG), which can show the characteristic changes in the heart's electrical activity. Other diagnostic tests may include a stress test, echocardiogram, or cardiac catheterization.

Treatment

Treatment for bifascicular block depends on the underlying cause and the severity of the blockage. In some cases, no treatment may be necessary. In others, treatment may include medications to control the heart rate or rhythm, a pacemaker to regulate the heart's electrical signals, or surgery to repair the damaged fascicles.

Prognosis

The prognosis for individuals with bifascicular block varies depending on the underlying cause and the severity of the blockage. With appropriate treatment, many individuals can lead normal, healthy lives. However, in some cases, bifascicular block can lead to serious complications, including sudden cardiac death.

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