For example, while working with a cardiologist, these nurses might help treat patients who have heart problems, such as congestive heart failure, cardiac dysrhythmia, myocardial infarction, cardiomyopathy, or angina-related problems.eople work as cardiac nurses in many different settings. For example, they might work in intensive care units (ICU) in hospitals, cardiac rehabilitation units, coronary care units (CCU) in hospitals, catheterization labs, or other heart-related medical settings.