An emergency operation is required in a patient with severe systemic disease that is a constant threat to life (for example, decompensated heart failure). Which designation should be used?

• A. ASA IV E
• B. ASA IV
• C. ASA III E
• D. ASA III

Answer: (A)

In perioperative risk assessment, the ASA Physical Status classification communicates how sick the patient is. A patient with severe systemic disease that is a constant threat to life—such as decompensated heart failure—fits ASA IV. When the surgery must be performed emergently, an emergency modifier is added, yielding ASA IV E. This combination captures both the life-threatening systemic illness and the urgent need for surgery, guiding anesthesia planning and risk communication. The other designations miss either the severity (ASA III) or the emergency aspect (lacking the E), so they don’t reflect both elements as accurately.