Code Blue is a standardized hospital alert for a patient with actual or imminent cardiopulmonary arrest. It signals an emergency response focused on cardiopulmonary resuscitation (CPR) and advanced life support. It is primarily an acute care workflow used in inpatient units, procedural areas, and outpatient facilities. It is most commonly used in hospital medicine, emergency care, and cardiology-related emergencies.

Cardiac Triage is the structured prioritization of patients with suspected or known cardiovascular disease based on urgency and risk. It is a clinical workflow concept used in acute care, especially emergency medicine, prehospital care, and inpatient cardiology. It combines symptoms, vital signs, electrocardiography (ECG), biomarkers (for example troponin), and bedside assessment to guide next steps. It is commonly applied to presentations such as chest pain, dyspnea, syncope, palpitations, and hemodynamic instability.

Cardiac Emergency is an umbrella term for sudden, potentially life-threatening heart-related conditions that require immediate evaluation and time-sensitive treatment. It is used in acute care cardiology, emergency medicine, critical care, and prehospital care (paramedic/EMS). It commonly refers to problems of coronary blood flow, cardiac rhythm, pump function, or major cardiovascular structures. It is discussed in triage, resuscitation protocols, and urgent decision-making for diagnostics and intervention.

Basic Life Support is the initial set of emergency actions used to support breathing and circulation in a person who is critically ill or unresponsive. It is an acute-care protocol centered on cardiopulmonary resuscitation (CPR) and early defibrillation with an automated external defibrillator (AED). It is most commonly used for suspected cardiac arrest, severe respiratory failure, and choking emergencies. It is taught for both out-of-hospital and in-hospital settings as a foundational resuscitation skill.