Left anterior fascicular block

A left anterior hemiblock ( LAH abbr, LAHB ) is a disorder of impulse conduction in the heart. It is the most common conduction disturbance on ventricular level, and may also in heart- healthy people and animals occur.

Frequency

However, in the majority of cases it is caused by coronary heart disease with involvement of the anterior descending coronary artery ( left anterior descending artery or LAD ). A LAH does not cause any discomfort. The diagnosis is made on the basis of the electrocardiogram (ECG).

Pathophysiology

When linksanteriorem hemiblock of the left front fascicle of the left bundle branch is blocked. By blocking the rapid conduction through the bundle branch, the front wall of the heart muscle on the slower connections of ordinary cardiac muscle cells is energized. In the time course of the anterior wall of the heart depolarized later than in healthy individuals. The electrical heart axis is rotated to the left.

Diagnosis

The ECG shows an overtightened links type and a S wave of V6. The QRS complex is not significantly broadened, which is below 120 ms.