PI blood flow perfusion index and perfusion index:
   Generally, PI, as a parameter index, can reflect the body perfusion status of the subject, indicating the accuracy of the machine. That is, under the condition of low perfusion and weak perfusion, it can still be detected.
   And, through the PI shows, but also shows that be defined body condition itself, namely when low perfusion, whether that be defined itself causes such as heart problems, shock, etc., at the same time also can reflect whether there are external factors such as the cause of such as the day is cold, and peripheral circulation is poor, and through the above situation to judge!
   PI refers to Perfusion Index (PI), and the PI value reflects pulsating blood flow, that is, the capacity of blood Perfusion. The larger the blood flow, the larger the component and the larger the PI. Thus, both the measurement site (skin, nail, bone, etc.) and the patient's own blood perfusion (arterial blood flow) will affect PI values. Since sympathetic nerves can affect heart rate and arterial blood pressure (affect pulse artery blood flow), the human body's neuromodulation system or mental state can also indirectly affect PI values. Thus, under different anesthesia, the PI value will be different.