To monitor circulation, which parameters are used?

• A. BP, CO, and CI
• B. HR, RR, SpO2
• C. Temperature and EtCO2
• D. Urine output and creatinine

Answer: (A)

Monitoring circulation centers on hemodynamic status: blood pressure, cardiac output, and cardiac index. Blood pressure shows the arterial driving pressure for organ perfusion, while cardiac output is the volume the heart pumps each minute, a direct measure of pump performance. Cardiac index refines that by indexing CO to body surface area, making comparisons across patients meaningful and helping gauge perfusion relative to one’s size. Together, these parameters give a real-time picture of global perfusion and guide fluid therapy, vasopressors, and inotropes during anesthesia. The other options relate more to ventilation, oxygenation, metabolism, or renal function and don’t directly quantify circulatory flow—so they’re not used as the primary circulation monitors.