Patient: I would like to ask you, I found complete right bundle branch block and sinus rhythm during my physical examination, and I didn’t know it from my previous physical ECG. Then I had a cardiac ultrasound, and it was fine and normal. Is there something wrong with my heart? What should I pay attention to or take some heart tonic or reassuring medicine? Chen Taibo: The human heart depends on electricity every time it beats, and the conduction of electricity has to pass through the “electric wire”, the right bundle branch is the “electric wire”, besides the right bundle branch, there is also the left bundle branch accordingly. The right bundle branch is thinner than the left bundle branch, so the conduction of electricity in the right bundle branch is sometimes not as smooth as the left bundle branch, which is called “right bundle branch conduction block”. Because of the physiological characteristics of the right bundle branch, 80% of right bundle branch block occurs in normal healthy people (right bundle branch block is divided into complete and incomplete, which is irrelevant; right bundle branch block in healthy people is sometimes called “functional block”), which is very common in clinical work. This is very common in clinical practice. In the case of left bundle branch block, it is almost 99% or even completely related to organic heart disease. A young person with no clear history of heart disease and a normal cardiac ultrasound can consider a right bundle branch block to be a functional block and can consider himself to be a completely healthy heart person.