A 45 year old man is admitted to the ED after developing sev…

A 45 year old man is admitted to the ED after developing severe chest pain while raking leaves. On admission he has mid-chest dullness and a normal EKG. The physician schedules the client for cardiac catheterization with coronary angiography and possible percutaneous coronary intervention (PCI). The nurse prepares the client for the procedure by explaining that, in his case, this procedure is used to: