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There are a number of them: the Pulse Oximeter- requiresa pulse so is placed on an artery. It uses red and infrared light to measure the colour of the blood. If blood is oxygenated it is bright red and absorbs/reflects light differently to darker blood which is deoxygenated. Benarons monitor is similar to pulse oximeter but uses shorter light (blue and green). This is used to monitor capillaries and does not require a pulse hence is suitable when perforning things like bypass surgey.

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16y ago

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