left anterior fascicular block

Left anterior fascicular block.

Left anterior fascicular block is a cardiac condition, distinguished from left bundle branch block.

Common causes of LAD include left ventricular hypertrophy, left anterior fascicular block (or hemiblock) and inferior myocardial infarction.

There are also partial blocks of the left bundle branch: "left anterior fascicular block" (LAFB) and a "left posterior fascicular block" (LPFB).

A subset of individuals with the triad of first-degree heart block, right bundle branch block, and either left anterior fascicular block or left posterior fascicular block (known as trifascicular block) may be at an increased risk of progression to complete heart block.