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Oximeter measured indicators, respectively, pulse rate, blood pressure, oxygen saturation and perfusion index (PI). Blood oxygen saturation (oxygen saturation SpO2 for short) is one of the most important basic data on the clinical. Blood oxygen saturation refers to the total blood volumes were O2 O2 capacity of the total combined percentage of capacity.

Body oxygen consumption come from hemoglobin (hemoglobin in normal blood, there are four: oxygenated hemoglobin (HbO2), restores hemoglobin (Hb), carbon-oxygen hemoglobin (CoHb), methemoglobin (MetHb). Reversible binding is reduced hemoglobin and oxygen, and oxygen is combined with the were carboxyhemoglobin and methemoglobin. ) Carry oxygen. Usually called blood oxygen content refers to the amount of oxygenated hemoglobin in the blood, the physical quantities in blood oxygen saturation to describe changes in blood oxygen levels.