Thank you for your comment.....I hate being so preoccupied about his heart all the time...it's so time consuming!
There is an indirect connection with CAD and a rhythm disorder. If serious the CAD (can cause chest pain) by enlarging the heart, and an enlarged heart can cause a rhythm disorder. I doubt that is the situation...would be other symptoms.
Or the LBBB can just cause an irregular heart rhythm. For some insight, the left bundle branch is a group of pathways for electrical impulses to follow down the atrium (wall that separates left and right chambers) to the left ventricle (pumping chamber) causing contractions. If a pathway is "blocked" or partially blocked, the electrical impulse may fail to contract the ventricle causing a skipped beat and possibly an extra beat.
The condition (chest pain and LBBB) can be successfully treated.