Under the supervision of cardiologists, cardiac nurses perform a variety of duties to treat both acute and long-term heart diseases. Defibrillators are used for people who have acute heart failure, such as heart attacks or cardiac arrest. Cardiac nurses can help surgeons during cardiac operations as well. https://www.completeassignmenthelp.com/blog/the-key-to-get-good-grades-cardiac-nursing-assignment-and-cardiac-nursing-homework