Left anterior fascicular block what it causes?

What caused it?: These fascicals are the prefered conduction path of the heart beat through the left ventrical, the main pumping chamber of the heart. A block in the fascical is generally caused by a blockage in a heart artery and often that blockage is more important than the fascical. If more fascicals are blocked, you are at risk of needing a pacemaker. Primary cardiomyopathies can cause these problems too.