The phenomenon of concealed conduction in a case of His bundle pacing (HBP).

The phenomenon of concealed conduction in His bundle pacing (HBP) has rarely been reported. We report here a patient who had 2: 1 atrioventricular block and complete left bundle branch block was used because of HBP. The patient developed continuous right bundle branch block after the operation. After excluding mechanical damage, we speculate that the mechanism of right bundle branch block in this case was due to concealed conduction.