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left anterior fascicular block
Left anterior fascicular block, sometimes abbreviated LAFB, is a cardiac condition, distinguished from left bundle branch block.
It is caused by only the anterior half of the left bundle branch being defective. It is manifested on the ECG by left axis deviation.
It is much more common than left posterior fascicular block.
==Characteristics==
Normal activation of the left ventricle proceeds down the left bundle branch, which consist of three fascicles, the left anterior fascicle, the left posterior fascicle, and the septal fascicle. The posterior fascicle supplies the posterior and inferoposterior walls of the left ventricle, the anterior fascicle supplies the upper and anterior parts of the left ventricle and the septal fascicle supplies the septal wall with innervation. Left Anterior Fascicular Block (LAFB), which is also known as Left Anterior Hemiblock (LAHB), occurs when a cardiac impulse spreads first through the left posterior fascicle, causing a delay in activation of the anterior and upper parts of the left ventricle. Although there is a delay or block in activation of the left anterior fascicle there is still preservation of initial left to right septal activation as well as preservation of the inferior activation of the left ventricle (preservation of septal Q waves in I and aVL and predominantly negative QRS complex in leads II, III, and aVF). The delayed and unopposed activation of the remainder of the left ventricle now results in a shift in the QRS axis leftward and superiorly, causing marked left axis deviation. This delayed activation also results in a widening of the QRS complex, although not to the extent of a complete LBBB.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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