What device can help in determining the oxygen saturation of a patient?

The pulse oximeter is a device specifically designed to measure the oxygen saturation levels in a patient's blood. It works by utilizing light absorption characteristics of oxygenated and deoxygenated hemoglobin to provide a non-invasive indication of blood oxygen saturation. This is crucial in clinical settings, allowing healthcare providers to quickly assess a patient's respiratory function and the efficiency of oxygen delivery throughout the body.

In contrast, an electrocardiogram (ECG) is used primarily to assess the electrical activity of the heart, not the oxygen saturation in the blood. A capnometer measures the concentration of carbon dioxide in exhaled air, providing information about ventilation rather than oxygen levels. Lastly, a blood pressure cuff is used to measure blood pressure and does not provide any information regarding a patient's oxygen saturation. The pulse oximeter is therefore the most appropriate and relevant device for determining oxygen saturation.