The perfusion index or PI is the relationship between two types of blood flow, in the peripheral tissue of a patient, such as the fingertips, the toes or the earlobe.
The perfusion index is an indication of the strength of the pulse at the site where it is monitored.
PI values range from 0.02% for a very weak pulse to 20% for an extremely strong pulse.
The perfusion index varies according to patients, physiological conditions, and monitoring sites.
Due to this variability, each patient must establish their own “normal” perfusion rate for a given location and use it for monitoring purposes.
Normal perfusion index levels
The peripheral perfusion index is a numerical value that reflects the relative strength of the different components of the infrared (IR) signal returning from the monitoring site and reflects real-time changes in peripheral blood flow.
It is displayed on the oximeter monitor and its measurement is mainly influenced by the amount of blood at the monitoring site.
Detecting compromised circulation as early as possible can be valuable in detecting heart disease.
The perfusion rate is normally monitored with pulse oximeters. The PI is also a good indicator of the reliability of the pulse oximeter reading.
For most general purpose pulse oximeters, the reading is unreliable or unavailable if the PI is equal to or less than 0.4%.
Other uses of the perfusion index can be found in various publications. As we learn more about PI, more clinical applications are discovered.
Pulse oximeter for check Perfusion Index
Interested in monitoring your PI?
The perfusion index derived from a pulse oximeter is calculated as the ratio of blood flow in peripheral tissue, and can be measured non-invasively.
There are a variety of pulse oximeters and sensors designed to suit the individual needs of each user.
This includes handheld pulse oximeters, recommended for spot monitoring or continuous use at night.
There are a variety of sensors available to pair with this device, each designed to meet different user requirements.
There are also handheld digital pulse oximeters with fingertip control. These devices are great for monitoring on the go.
If you are looking for an easy-to-use night pulse oximeter, we suggest you check out the wrist oximeter, designed for comfortable and continuous use.
How to increase perfusion index?
First, you have to understand the perfusion index and the Spo2 values (Plethysmograph).
What is Normal Spo2 and pr bpm?
what is Normal Spo2 and pr bpm?