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Encyclopedia > Left bundle branch block
Left bundle branch block
Classification & external resources
DiseasesDB 7352
eMedicine ped/2501 
ECG characteristics of a typical LBBB showing wide QRS complexes with abnormal morphology in leads V1 and V6.
ECG characteristics of a typical LBBB showing wide QRS complexes with abnormal morphology in leads V1 and V6.

Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle is delayed, which results in the left ventricle contracting later than the right ventricle. The Disease Bold textDatabase is a free website that provides information about the relationships between medical conditions, symptoms, and medications. ... eMedicine is an online clinical medical knowledge base that was founded in 1996. ... Image File history File links No higher resolution available. ... Lead II An electrocardiogram (ECG or EKG, abbreviated from the German Elektrokardiogramm) is a graphic produced by an electrocardiograph, which records the electrical activity of the heart over time. ... In the heart, a ventricle is a heart chamber which collects blood from an atrium (another heart chamber that is smaller than ventricle) and pumps it out of the heart. ...


ECG criteria

The ECG diagnosis of LBBB requires a supraventricular rhythm with a QRS complex = or > than 0.12 sec (120 ms), an rS or QS complex in lead V1, and a monophasic R wave in leads I and V6. A minority will show an S wave in lead V6. The T wave should be deflected opposite the terminal deflection of the QRS complex. A terahertz (THz) is 1012 hertz or a thousand gigahertz, a measure of frequency. ... The QRS complex is a record of the measurement of the movement of electrical impulses through the lower heart chambers (ventricles). ...


Among the causes of LBBB are:

For other forms of hypertension, see Hypertension (disambiguation). ... Acute myocardial infarction (AMI or MI), commonly known as a heart attack, is a disease state that occurs when the blood supply to a part of the heart is interrupted. ... This article or section does not adequately cite its references or sources. ...


  • Medical Care: Patients with LBBB require complete cardiac evaluation, and those with LBBB and near-syncope or syncope may require a pacemaker.
  • Surgical Care: Some patients with LBBB, a markedly prolonged QRS, and congestive heart failure may benefit from a pacemaker, which provides rapid left ventricular contractions.

See also

  Results from FactBites:
Arrhythmias (abnormal heart rhythms) (1770 words)
Bundle branch block (BBB) is a disruption in the normal flow of electrical pulses that drive the heart beat.
The right bundle carries nerve impulses that cause contraction of the right ventricle (the lower chamber of the heart) and the left bundle carries nerve impulses that cause contraction of the left ventricle.
Bundle heart block may be caused by damage to the heart muscle resulting from a heart attack.
  More results at FactBites »



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