Left posterior fascicular block

Left Posterior Fascicular Block (LPFB) is a cardiac conduction abnormality seen on an electrocardiogram (ECG). It is one of the types of bundle branch block, specifically affecting the left posterior fascicle of the left bundle branch in the heart's electrical conduction system.

Overview

The human heart has a complex electrical system that controls the rate and rhythm of the heartbeats. The left bundle branch is one of the main components of this system, and it is divided into two main fascicles: the anterior and the posterior. In LPFB, the electrical signals are delayed or blocked along the pathway of the posterior fascicle. This condition is less common than left anterior fascicular block (LAFB).

Causes

LPFB can be caused by various conditions that damage the heart muscle or its electrical system. These include coronary artery disease, hypertension, cardiomyopathy, and myocardial infarction. It can also occur as a result of aging or can be a congenital condition.

Diagnosis

LPFB is diagnosed primarily through an ECG. The characteristic ECG findings include right axis deviation and rS complex in leads I and aVL.

Treatment

The treatment of LPFB primarily involves managing the underlying condition causing the block. In some cases, no treatment may be necessary if the block is not causing any symptoms or complications. In severe cases, a pacemaker may be required to regulate the heart's rhythm.

Prognosis

The prognosis for individuals with LPFB varies depending on the underlying cause and the presence of other heart conditions. In general, it is considered a benign condition, but it can be a marker of underlying heart disease.

See also

• Bundle branch block
• Left anterior fascicular block
• Right bundle branch block