There are a few papers that discuss what the Compensatory reserve index (CRI) is, and its relevance during simulated hemorrhage. These papers only elude that the CRI is calculated using a unique algorithm. How exactly then, is it calculated. i.e which parameters does one need to calculate (MAP, HR, SV, TRP, etc)? Also, can one calculate the CRI retrospectively?
Hello Michael,
unfortunately I am not able to help you in this matter.
Best regards
Jochim
Hello Michael,
I have published multiple papers on the CRI, and I work for a leading researcher in this area. The CRI is a proprietary algorithm that has recently been approved by the FDA for use in clinical settings. It is sold by a company called Flashback Technologies. The algorithm uses a proprietary signal processing method whereby hundreds of features of the PPG waveform are extracted from beat-to-beat data obtained from a standard pulse oximeter. The latest version of the Flashback device connects via bluetooth to a small tablet with a readout of the waveform and the continuous CRI value plotted on the screen with a red/yellow/green gauge. Unfortunately, at present there is no way to calculate the CRI without a Flashback device. It is possible to retrospectively calculate CRI values on previously obtained data, but you would have to go through Flashback to request this for research purposes, the continuous PPG waveform is all you need to do this. We have a lot of research ongoing on this topic, including experimental (LBNP) and clinical studies. You can contact me if you would like to learn more, and I'd be happy to share our papers with you.
I hope this is helpful,
Jeff
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