pulzoximéteres

A pulzoximéteres, or pulse oximeter, is a non-invasive medical device used to measure an individual's oxygen saturation in the blood and their pulse rate. It works by shining two beams of light, one red and one infrared, through a thin part of the body, typically a fingertip, earlobe, or toe. The device then measures the difference in light absorption between oxygenated hemoglobin and deoxygenated hemoglobin. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through, while deoxygenated hemoglobin absorbs more red light and allows more infrared light to pass through. By calculating the ratio of red to infrared light absorbed, the pulse oximeter can determine the percentage of hemoglobin that is carrying oxygen, known as SpO2.

Pulse oximeters are commonly used in various healthcare settings, including hospitals, clinics, and during anesthesia. They are also increasingly used for home monitoring of conditions like COPD, asthma, and sleep apnea, as well as by athletes to track performance. The device displays the SpO2 percentage and pulse rate on a digital screen. Normal SpO2 levels are typically between 95% and 100%. Readings below this range can indicate hypoxemia, a condition where there is insufficient oxygen in the blood, which may require medical attention. While pulse oximeters are generally accurate and reliable, certain factors such as poor circulation, nail polish, or excessive movement can affect readings.