A cardiac nurse, more commonly referred to as a cardiac care nurse, is a professional who cares specifically for patients who heart problems. While the duties and responsibilities of a nurse with this title may vary from setting to setting, CCN’s will help to treat patients who have suffered or suffer from congestive heart failure, cardiac dysrhythmia, cardiomyopathy, or angina problems. The nurse may perform stress tests, complete health assessments, care for a patient after an operation, or closely monitor the patient’s heart rate.