Bundle Branch Blocks
Bundle branch block is a condition in which there's a delay or obstruction along the conduction pathway that electrical impulses travel to make your heart beat. The delay or blockage may occur on the pathway that sends electrical impulses to the left or the right side of your heart.
Bundle branch block sometimes makes it harder for your heart to pump blood efficiently through your circulatory system.
There's no specific treatment for bundle branch block itself. However, any underlying health condition that caused bundle branch block, such as heart disease, will need to be treated. Sometimes, bundle branch block is associated with other problems in the heart's electrical system that can lead to dangerously slow heartbeats that need treatment with a temporary or permanent pacemaker.
The criteria for diagnosis RBBB
In RBBB, activation of the right ventricle is delayed as depolarisation has to spread across the septum from the left ventricle.
The left ventricle is activated normally, meaning that the early part of the QRS complex is unchanged.
The delayed right ventricular activation produces a secondary R wave (R') in the right precordial leads (V1-3) and a wide, slurred S wave in the lateral leads.
Delayed activation of the right ventricle also gives rise to secondary repolarisation abnormalities, with ST depression and T wave inversion in the right precordial leads.
In isolated RBBB the cardiac axis is unchanged, as left ventricular activation proceeds normally via the left bundle branch.
Criteria for left anterior fascicular block
Left axis's deviation
Small Q-wave in leads I and Avl, small R-wave in II, III, and Avf
Usually normal QRS duration
Late deflection in aVL (>0.045 s)
Increased R-wave voltage in the0]# 1 limb leads
The criteria for...