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Pulse oximeters demonstrate different responses during hypothermia and changes in perfusion.
1Department of Anesthesiology, Faculty of Medicine, The University of Tokyo, Tokyo, Japan. nishit-tky@umin.ac.jp
Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|January 26, 2006
Summary
This study compared pulse oximeter performance in hypothermia. The Masimo SET was slowest to respond to perfusion changes, while the Nellcor N-595 was fastest but slowest to initially detect SpO2.
Area of Science:
- Medical Devices
- Physiological Monitoring
Background:
- New pulse oximeters claim resistance to motion and hypoperfusion.
- Clinical validation under challenging conditions is crucial.
Purpose of the Study:
- Compare performance of three pulse oximeters (Dolphin 2100, Nellcor N-595, Masimo SET) under hypothermia and altered perfusion.
- Evaluate device accuracy and responsiveness in simulated low-perfusion states.
Main Methods:
- Ten healthy male volunteers participated after informed consent.
- Oximeter probes were attached to the index finger.
- Measurements included time to signal acquisition, signal loss/reacquisition during tourniquet application/release, and performance at reduced dermal temperature (27°C).
Main Results:
- Nellcor N-595 was slowest to initially acquire SpO2 and pulse wave.
- Masimo SET maintained signal longer during tourniquet application.
- Nellcor N-595 was fastest to reacquire signal after tourniquet release.
Conclusions:
- Nellcor N-595 demonstrated the fastest response to perfusion changes post-occlusion.
- Masimo SET showed slower response to perfusion alterations.
- Nellcor N-595 exhibited the longest initial signal acquisition time.