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Accuracy of pulse oximetry during hypoxemia
1Department of Anesthesiology, University of South Florida College of Medicine, Tampa 33612.
Southern Medical Journal
|April 1, 1994
Summary
Pulse oximeter accuracy declines with worsening arterial hypoxemia (low oxygen levels). Co-oximetry confirmation is vital for critical arterial oxyhemoglobin saturation measurements.
Area of Science:
- Medical Devices
- Respiratory Physiology
- Clinical Diagnostics
Background:
- Pulse oximetry is a common non-invasive method for estimating arterial oxygen saturation.
- Accuracy of pulse oximeters may be compromised under conditions of hypoxemia.
- Limited data exists on the performance of multiple pulse oximeter devices during varying degrees of hypoxemia.
Purpose of the Study:
- To evaluate the accuracy of four different pulse oximeters.
- To assess device performance during mild and moderate arterial hypoxemia.
- To compare pulse oximetry saturation (SpO2) with co-oximetry-derived arterial oxyhemoglobin saturation (SaO2).
Main Methods:
- Healthy volunteers underwent stepwise induced arterial desaturation.
- Four pulse oximeters (Dinamap Plus Model 8700, Oxyshuttle, Ohmeda 3700, MiniOx IV) were tested.
- SpO2 readings were compared against SaO2 measurements from co-oximetry at defined oxygen saturation plateaus.
Main Results:
- Pulse oximeter accuracy significantly deteriorated as SaO2 decreased.
- In 14 instances with SaO2 below 90%, SpO2 readings were falsely reported above 90%.
- All tested devices showed reduced accuracy at lower arterial oxygen saturation levels.
Conclusions:
- The accuracy of pulse oximetry is inversely related to the severity of hypoxemia.
- Reliance on pulse oximetry alone can lead to inaccurate assessments during hypoxemia.
- Co-oximetry is essential for precise arterial oxyhemoglobin saturation determination when critical.