Cardiac nursing is a speciality of nursing that works with patients suffering from various diseases of the cardiovascular system. Under the direction of a cardiologist, cardiac nurses help treat conditions such as unstable angina, cardiomyopathy, coronary artery disease, congestive heart failure, myocardial infarction, and arrhythmias. Cardiac nurses perform postoperative care in the operating room, stress test evaluations, cardiac monitoring, vascular monitoring, and health assessments. Cardiac nurses must be certified in Basic Life Support and Advanced Cardiac Life Support. In addition, cardiac nurses must have specialized skills such as ECG monitoring, defibrillation, and drug delivery via continuous intravenous infusion. Cardiac nurses are used in coronary care units (CCU), cardiac catheterization, intensive care units (ICU), operating rooms, cardiac rehabilitation centres, clinical research, cardiac surgery wards, cardiovascular intensive care units (CVICU), cardiology wards, etc., working in different environments.