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[Accuracy of a pulse oximeter during hypoxia]
C Tachibana1, T Fukada, R Hasegawa
1Tokyo Women's Medical College Daini Hospital, Japan.
Masui. the Japanese Journal of Anesthesiology
|April 1, 1996
Summary
Pulse oximetry is useful for monitoring oxygen saturation in hypoxic patients with congenital heart disease. However, accuracy decreases at lower saturation levels, requiring comparison with direct measurements during severe hypoxemia.
Area of Science:
- Cardiology
- Medical Devices
- Physiology
Context:
- Hypoxic patients, particularly those with cyanotic congenital heart disease (CCHD), require accurate monitoring of arterial oxygen saturation (SaO2).
- Pulse oximetry (SpO2) is a non-invasive method commonly used for this purpose, but its accuracy in specific patient populations needs validation.
Purpose:
- To evaluate the accuracy of pulse oximetry (SpO2) compared to arterial blood gas analysis (SaO2) in patients with CCHD during surgery.
- To determine the reliability of SpO2 readings across different levels of oxygen saturation, especially during hypoxemia.
Summary:
- A study involving 11 CCHD patients compared SpO2 and SaO2 measurements, yielding 90 data points.
- A mean bias of 1.7 +/- 6.9% was observed, with SpO2 values generally higher than SaO2 in CCHD patients.
- Pulse oximetry showed reduced accuracy at SaO2 levels below 80% and a strong positive correlation (r=0.93) between SpO2 and SaO2.
Impact:
- Pulse oximetry provides a valuable tool for continuous oxygen saturation monitoring in hypoxic CCHD patients.
- Clinical decisions based on pulse oximetry readings, especially during severe hypoxemia (SaO2 < 80%), should be corroborated with direct arterial blood gas measurements.