Which device is used to monitor pulse rate and oxygenation during anesthesia?

• A. Ventilator
• B. Capillary refill time
• C. Pulse oximeter
• D. Flow meter

Answer: (C)

Monitoring pulse rate and oxygenation during anesthesia relies on a device that provides both heart rate and arterial oxygen saturation in real time. The pulse oximeter fits this role by clipping onto a thin area of the body (such as an ear, paw, or tongue in animals) and using light absorption to estimate SpO2 (blood oxygen saturation) while also detecting pulsatile blood flow to calculate the pulse rate. This dual readout helps you assess whether the patient is adequately oxygenated and whether the heart is beating with a normal rate. In contrast, a ventilator delivers breaths but doesn’t measure oxygenation or heart rate; capillary refill time is a quick, indirect perfusion check rather than continuous monitoring; and a flow meter measures gas flow through the anesthesia machine, not the patient’s oxygenation or pulse rate.