What is a bundle branch block?

What is a bundle branch block?

A bundle branch block (BBB) is when something blocks or disrupts the electrical signal that causes your heart to beat. This block leads to an abnormal heart rhythm.

Your heart’s tissue sends electrical impulses that travel through pathways called bundle branches. These impulses normally travel through the bottom chambers of your heart (ventricles). Your heart’s two ventricles usually contract at the same time. But a bundle branch block delays the electrical signal, therefore, the ventricle that receives the delayed signal will contract at a later time.

Healthcare providers don’t always treat bundle branch blocks. But they may treat the underlying health problems that cause the block.