Table 1.
Demographics and laboratory data of the patients.
Fig 1.
SaO2 (oxyhemoglobin saturation) data of 32 patients obtained immediately after arterial catheter placement.
Before right heart catheterization, each patient had an arterial catheter placed into their radial artery ipsilateral to the pulse oximeter probes. Arterial blood was sampled, and the SaO2 was measured by blood gas analyzer (ABL 825). Closed squares indicate initial SaO2 values of 32 patients enrolled in this study.
Table 2.
Calculated biases between SaO2 (oxyhemoglobin saturation measured by blood gas analyzer [ABL 825]) and SpO2 (oxyhemoglobin saturation measured by 3 pulse oximeters) among 5 healthy volunteers.
Table 3.
Calculated biases between SaO2 (oxyhemoglobin saturation measured by blood gas analyzer [ABL 825]) and SpO2 (oxyhemoglobin saturation measured by 3 pulse oximeters).
Fig 2.
Bland Altman plot comparing SaO2 (oxyhemoglobin saturation measured by blood gas analyzer (ABL 825)) and SpO2 (oxyhemoglobin saturation measured by 3 pulse oximeters).
For each data point, the mean value ([SpO2 +SaO2]/ 2) is presented on the x-axis, and the difference value (SpO2—SaO2) on the y-axis. Black lines represent the 95% confidence interval for SpO2 [bias ± 2 standard deviation (SD)]. The mean difference value (SpO2—SaO2) represents the bias, and SD represents the precision. Oximeters are: A. Nihonkohden OLV-3100, B. Nellcor N-BS, and C. Masimo Radical. Bias was 0.19% +/- 1.79% (mean +/- SD) by Nihonkohden oximeter, 0.18% +/- 1.64% by Nellcor oximeter, and 1.61% +/- 1.93% by Masimo oximeter.
Table 4.
Calculated biases between SaO2 (oxyhemoglobin saturation measured by blood gas analyzer [ABL 825]) and SpO2 (oxyhemoglobin saturation measured by 3 pulse oximeters) among patients under room air condition.
Fig 3.
Bias (mean ± SD) for the 3 oximeters in the 5% range of SaO2 (oxyhemoglobin saturation measured by blood gas analyzer [ABL 825]).
Bias is calculated as SpO2 (oximeter-measured value of oxyhemoglobin saturation) minus SaO2. SpO2 measured by Nihonkohden 3100 are indicated with closed circles, SpO2 by Nellcor N-BS with gray circles, and SpO2 by Masimo radical with open circles. Data are presented as the mean ± SD and analyzed by one-way analysis of variance followed by Tukey’s test: * p<0.0001 vs. Nihonkohden 3100 and Nellcor N-BS.
Table 5.
Optimal SpO2 value and ability of 3 pulse oximeters to detect hypoxemia (SaO2≦90%).
Table 6.
Optimal SpO2 value and ability of 3 pulse oximeters to detect hypoxemia (PaO2≦60 mmHg).