Left anterior hemiblock
| Classification according to ICD-10 | |
|---|---|
| I44.4 | Left anterior fascicular left anterior fascicular block |
| ICD-10 online (WHO version 2019) | |
A left anterior hemiblock ( abbr. LAH , LAHB ) is a disorder of the conduction of excitation in the heart . It is the most common conduction disorder at the heart chamber level and can also occur in people and animals with healthy hearts.
frequency
In the majority of cases, however, it is caused by coronary artery disease involving the anterior descending coronary artery ( Ramus interventricularis anterior or RIVA ). LAH itself does not cause any complaints. The diagnosis is made using an electrocardiogram (EKG).
Pathophysiology
In the left anterior hemiblock, the anterior fascicle of the left tawara thigh is blocked. By blocking the rapid conduction of excitation through the tawara thigh, the anterior wall of the heart muscle is stimulated via the slower connections of the normal heart muscle cells. Over time, the heart muscle cells in the anterior wall depolarize later than in healthy people. The electrical axis of the heart is rotated to the left.
diagnosis
The ECG shows an over-turned left type and S-waves up to V6. The QRS complex can be significantly widened (> 120 ms).