Signal represents the patient information and noise is extraneous information at the detector within the sensor.
High Perfusion Index So, besides telling you that your pulse may be strong or weak in an extremity such as your fingers or toes, what does the perfusion index indicate? Should the perfusion index reading be under0.
Once again, studies have proved a correlation between an increase in Perfusion Index levels and dilation of the peripheral blood vessel, which usually occurs just before anesthesia.
The authors concluded that more research is needed to understand and correct this racial bias.
A value of less than 0.
Outside of general practice, pulse oximetry is most frequently used to monitor patients with lung and heart disorders, who are at risk of low levels of blood oxygen.