Sp02 is an abbreviation for arterial oxygen saturation. Please Keep in mind Sp02 is a measurement of arterial blood (not venous blood) because arteries contain the red blood cells that have most recently passed through the lungs, where they collect oxygen. PR refers to pulse rate, the number of times your heart beats per minute. PI refers to perfusion index, which is the ratio of the pulsatile blood flow to the non-pulsatile or static blood in peripheral tissue.
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