Left Bundle Branch Block by ECG Finding

**Semantic type:** Finding

**Definition:** An electrocardiographic finding of a wide QRS complex with evidence of delayed conduction to the left ventricle, manifested as a widened initial portion of the QRS complex in leads V5, V6, I and aVL and with QRS duration greater than or equal to 120 ms. (CDISC)

**Synonyms:** - Complete LBBB - LBBB - LBBB - LEFT BUNDLE BRANCH BLOCK - Left Bundle Branch Block - Left Bundle Branch Block by EKG Finding - Left bundle branch block - Left bundle-branch block