Left anterior fascicular block
| Left anterior fascicular block | |
|---|---|
| Other names | "LAFB," "left anterior hemiblock," "LAHB" |
| ECG displaying high lateral Q waves and left axis deviation, characteristic of LAFB. | |
| Specialty | Cardiology |
| Causes | Ischemic heart disease; progressive cardiac conduction disease |
| Diagnostic method | 12-lead ECG |
| Differential diagnosis | Left ventricular hypertrophy (LVH) |
Left anterior fascicular block (LAFB) is an abnormal condition of the left ventricle of the heart, related to, but distinguished from, left bundle branch block (LBBB).
It occurs as a result of a conduction block in the left anterior fascicle, one of the offshoots of the left bundle branch. It manifests on the ECG as left axis deviation (LAD) and QRS prolongation.