Left bundle branch block (LBBB) is a type heart block. It results from a problem with the electrical conduction system that enables the heart to beat. It may cause no symptoms, but an ...

A person with RBBB typically does not have symptoms and may not know they have the condition. On rare occasions, a person may faint due to a severe block, though this is unlikely to occur unless other ...

DEAR DOCTOR K >> I recently had an ECG that showed that I have a "left bundle branch block." What does this mean? DEAR READER >> When your heart beats, it does so in response to electrical signals.

Dear Doctor K: I recently had an ECG that showed that I have a “left bundle branch block.” What does this mean? Dear Reader: When your heart beats, it does so in response to electrical signals. Your ...