2025年2月18日 · Depolarisation spreads from endocardium to epicardium and thus the initial vector is directed downwards and rightwards, towards inferior leads. This produces small R waves in leads II, III and aVF, and small Q waves in leads I and aVL.

What is left anterior fascicular block? A left anterior fascicular block is the term for something interfering with your heartbeat’s signal when it gets to the left anterior fascicle of your heart’s …

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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 LV.

2024年11月18日 · 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.

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Block in the anterior fascicle causes left anterior fascicular block (LAFB). Block in the posterior fascicle causes left posterior fascicular block (LPFB). In a fascicular block, the myocardium without fascicular supply will depend on impulses spreading from other parts of the ventricle (where the fascicle is intact). Figure 1.

Left anterior fascicular block (LAFB) commonly presents with symptoms such as dizziness, fainting spells or syncope, shortness of breath, palpitations, and heart failure. These symptoms arise because of a disruption in the left bundle branch system, leading to delayed contraction of the left ventricle.

A conduction abnormality within the His-Purkinje system that manifests with marked left axis deviation on ECG. Isolated LAFB can occur as a benign consequence of aging or can be caused by coronary artery disease, valvular disease, hypertension, or cardiomyopathies.