It sounds like the key issue is that a division has been created. To rectify this issue, the team leader or manager needs to help the team understand that EP is just like angio's and everything else, that it's all part of the days work, that there is no division.
Perhaps the team leader (or manager, however your day is structured) needs to start with a prioritisation of the EP side, and then when they are relieved get someone to relieve angio. Or put a responsible team member in the "angio side" in charge of the breaks and set up for the EP side...somehow make the division less. Or, alternatively, train more people for EP so everyone gets a go. Or, perhaps, identify what seperates the two, and remove that.
If all else fails, perhaps in departmental meeting state the issue.