a left bundle branch block in the heart is a cardiac conduction abnormality.
a left bundle branch block in the heart is a cardiac conduction abnormality.
what is a left bundle branch block in the heart?
a cardiac conduction abnormality
left bundle branch block









































left bundle branch block (lbbb) is a cardiac conduction abnormality seen on the electrocardiogram (ecg). in this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle.









































section::::causes.









































among the causes of lbbb are:









































bullet::::- aortic stenosis









































bullet::::- dilated cardiomyopathy









































bullet::::- acute myocardial infarction









































bullet::::- extensive coronary artery disease









































bullet::::- primary disease of the cardiac electrical conduction system









































bullet::::- long standing hypertension leading to aortic root dilatation and subsequent aortic regurgitation









































bullet::::- lyme disease
left bundle branch block
depending on the anatomical location of the defect which leads to a bundle branch block, the blocks are further classified into:









































bullet::::- right bundle branch block









































bullet::::- left bundle branch block









































the left bundle branch block can be further sub classified into:









































bullet::::- left anterior fascicular block. in this case only the anterior half of the left bundle branch (fascicle) is involved









































bullet::::- left posterior fascicular block. only the posterior part of the left bundle branch is involved









































other classifications of bundle branch blocks are;
bundle branch block