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What tests will be done to diagnose left anterior fascicular block? Your healthcare provider will use an electrocardiogram (EKG) to diagnose left anterior fascicular block. Other tests can include: Cardiac MRI. Nuclear imaging. Stress test. Echocardiogram.
Left anterior fascicular block (LAFB), a pattern (formerly called left anterior hemiblock) seen on the surface electrocardiogram (ECG), results when normal electrical activity in the His-Purkinje system is delayed or interrupted (figure 1).
Typical ECG of LAFB, demonstrating: rS complexes in leads II, III, aVF, with small R waves and deep S waves. qR complexes in leads I, aVL, with small Q waves and tall R waves. Left Axis Deviation (LAD): Leads II, III and aVF are NEGATIVE; Leads I and aVL are POSITIVE. Associated features include:
Learn about left anterior fascicular block (hemiblock) and left posterior fascicular block, with emphasis on ECG criteria, causes, effects and management.
Left anterior fascicular block (LAFB) is considered a benign electrocardiographic (ECG) finding, 1 but its long-term consequences have not been comprehensively studied.
Left anterior fascicular block (LAFB) is considered a failure or delay of conduction in the left anterior fascicle. 1 Despite the fact that little is known about the long-term prognosis associated with LAFB, it has generally been thought of as a benign electrocardiographic (ECG) finding. 2 This view was recently challenged in an article by ...
It is caused by only the left anterior fascicle – one 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.