By calculating the absorption by haemoglobin in the patient’s blood stream at these two different wavelengths, the oximeter can calculate the level of oxygenation present. Deoxygenated haemoglobin absorbs a greater amount of red light while allowing more infrared light to pass through. Oxygenated haemoglobin absorbs a greater amount of infrared light while allowing more red light to pass through. Opposite the emitter is a photodetector which receives and measures these streams of light as they pass through. Inside the probe is a light emitter that sends out two streams of light: one red and one infrared. Though they became widespread in the 1980s, oxygen monitors have historical precedence: an 18th century principle known as Beer’s Law, which found that different frequencies of light are absorbed in different volumes.Ī small probe, attached to a separate computerized unit, is clipped to a spot on the body with good blood flow – typically the finger or the earlobe. It is a non-invasive medical device that checks the level of oxygen in a patient’s bloodstream and sounds an alarm as soon as it detects the slightest unsafe change. ![]() A pulse oximeter is the most important monitoring tool in modern anaesthesia practice.
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