Bifascicular block
Encyclopedia
Bifascicular block is a conduction abnormality in the heart
where two of the three main fascicles of the His/Purkinje system
are blocked.
Most commonly, it refers to a combination of right bundle branch block
(RBBB) and either left anterior fascicular block
(LAFB) or left posterior fascicular block
(LPFB), with the former being more common.
Some authors consider left bundle branch block
(LBBB) to be a technical bifascicular block, since the block occurs above the bifurcation of the left anterior and left posterior fascicles of the left bundle branch.
a pacemaker
is recommended.
Heart
The heart is a myogenic muscular organ found in all animals with a circulatory system , that is responsible for pumping blood throughout the blood vessels by repeated, rhythmic contractions...
where two of the three main fascicles of the His/Purkinje system
Electrical conduction system of the heart
The normal intrinsic electrical conduction of the heart allows electrical propagation to be transmitted from the Sinoatrial Node through both atria and forward to the Atrioventricular Node. Normal/baseline physiology allows further propagation from the AV node to the ventricle or Purkinje Fibers...
are blocked.
Most commonly, it refers to a combination of right bundle branch block
Right bundle branch block
A right bundle branch block is a defect in the heart's electrical conduction system.During a right bundle branch block, the right ventricle is not directly activated by impulses travelling through the right bundle branch. The left ventricle however, is still normally activated by the left bundle...
(RBBB) and either left anterior fascicular block
Left anterior fascicular block
Left anterior fascicular block is a cardiac condition, distinguished from left bundle branch block.It is caused by only the anterior half of the bundle of His being defective...
(LAFB) or left posterior fascicular block
Left posterior fascicular block
A left posterior fascicular block is a condition where the left posterior fascicle, i.e. the backside part of the left cardiac bundle, does not conduct the electrical impulses from the atrioventricular node...
(LPFB), with the former being more common.
Some authors consider left bundle branch block
Left bundle branch block
Left bundle branch block is a cardiac conduction abnormality seen on the electrocardiogram . In this condition, activation of the left ventricle is delayed, which results in the left ventricle contracting later than the right ventricle....
(LBBB) to be a technical bifascicular block, since the block occurs above the bifurcation of the left anterior and left posterior fascicles of the left bundle branch.
Treatment
In those with bifasciular block and no symptoms little with respect to treatment is needed. In those with syncopeSyncope
In phonology, syncope is the loss of one or more sounds from the interior of a word; especially, the loss of an unstressed vowel. It is found bothin Synchronic analysis of languages and Diachronics .-Found synchronically:...
a pacemaker
Pacemaker
An artificial pacemaker is a medical device that uses electrical impulses to regulate the beating of the heart.Pacemaker may also refer to:-Medicine:...
is recommended.