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cerebral oxygen saturation are weighted venous samples (70% venous, 30% arterial) Pulse oximeter values are based on arterial oxygen saturations.

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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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What is the difference between pulse code and pulse amplitude in brief and concise terms?

In pulse amplitude modulation (PAM), you send a single pulse of a certain height (amplitude) that represents the value of the sampled signal at that time. With pulse code modulation (PCM), you take the same sampled value, but now represent that value by N bits, where N is the number of quantized regions. Why send a whole bunch of bits instead of just a single pulse? Because PCM performs better in situations of higher noise (AWGN).


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