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Left Bundle Branch Block

A conduction disturbance caused by delayed conduction through the left bundle branch, often indicating structural heart disease.

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Kardiyoloji department. Book Appointment →

What is Left Bundle Branch Block?

Left bundle branch block (LBBB) is a conduction disturbance in which delayed or absent conduction in the left bundle branch results in late depolarization of the left ventricle relative to the right. In complete LBBB the QRS duration exceeds 120 ms.

LBBB is frequently a marker of structural heart disease and occurs in hypertensive, ischemic and dilated cardiomyopathies. New-onset LBBB with chest pain is considered a STEMI equivalent.

LBBB masks classic ECG ischemia criteria; the Sgarbossa and Smith-modified Sgarbossa criteria are used to diagnose acute MI in this setting. In heart failure LBBB causes dyssynchrony and is an important indication for cardiac resynchronization therapy.

Symptoms

Palpitations and irregularity
Dyspnea
Reduced exercise tolerance
Syncope
Chest pain with associated ischemia
Fatigue
Sometimes discovered incidentally on ECG

Risk Factors

Hypertension
Coronary artery disease
Dilated cardiomyopathy
Aortic valve disease
Heart failure
Advanced age
History of myocarditis

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • When new-onset LBBB is identified
  • Chest pain with LBBB
  • Syncope or presyncope during exertion
  • Signs of heart failure
  • For planned regular cardiology follow-up

Treatment Methods

01
Treatment of the underlying heart disease
02
Functional assessment with echocardiography
03
Reperfusion in acute chest pain guided by Sgarbossa criteria
04
Heart failure medication (ACE/ARB, beta-blocker, MRA)
05
Cardiac resynchronization therapy for LV dyssynchrony
06
Regular follow-up and risk factor control

Which Department to Visit?

You can visit our Kardiyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Related Health Topics

Other articles from the same department you may want to explore.

Hypertension (High Blood Pressure)

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Hypertension is a condition in which blood pressure readings remain above 140/90 mmHg; early treatment helps prevent serious complications.

Coronary Artery Disease

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Narrowing of the coronary arteries due to atherosclerosis can cause chest pain (angina) and heart attack.

Heart Failure

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Heart failure is a chronic cardiac condition characterized by shortness of breath, leg swelling, and fatigue.

Heart Attack (Myocardial Infarction)

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A heart attack is a medical emergency; because heart muscle is lost by the minute, immediate intervention saves lives.

Atrial Fibrillation

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Atrial fibrillation is a common arrhythmia characterized by an irregular heartbeat and increased risk of stroke.

Heart Palpitations

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Palpitations are usually due to benign causes, but underlying cardiac rhythm disorders must be ruled out.

Heart Valve Diseases

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Valve stenosis or regurgitation increases the workload of the heart and, over time, can lead to heart failure.

Aortic Aneurysm

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Aortic aneurysms are often silent; early diagnosis allows treatment before rupture (a life-threatening tear).

Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.