Differences in partial oxygen saturation obtained from three pulse oximeters
Keywords:
Reproducibility of Results, Oximetry, Lung DiseasesAbstract
Background: It may be estimated certain variability in the measurement of partial oxygen saturation between pulse oximeters.
Objective: Describe the variability of partial oxygen saturation obtained from three different pulse oximeters.
Material and methods: Cross design, consecutive subjects. Data related to demographic variables, occupation, diseases and differences in variability of three pulse oximeters was obtained. Nominal variables were reported with frequencies and percentages, numerical with averages and standard deviation; the variability was calculated with the Bland-Altman statistic and its magnitude with the intraclass correlation coefficient (95% confidence interval).
Results: The 255 patients studied were aged between 61 ± 15 years, body mass index ranked 30.28 ± 6.59 kg/m2, 145 (56.8%) were female and 136 (53.33%) had tobacco smoking habit. The most frequent occupation were worker (98; 38.43%), and disease chronic obstructive pulmonary disease (143; 56.08%). Group average of arterial oxygen saturation vs. partial oxygen saturation: 91.28 ± 4.07% vs. 90.64 ± 3.89% (p < 0.0001). For the three oxymeters, the mean difference (limits of agreement) and the intraclass correlation coefficient (95% confidence interval) were respectively: Onyx-II −0.5 (3.4, −4.3), 0.949 (0.935, 0.960), Hergom 0.2 (3.4, −2.9), 0.951 (0.937, 0.962) and Rossmax SB220 −1.6 (36.2, −39.5), 0.784 (0.724, 0.831).
Conclusions: Onyx II and Hergom pulse oximeters had low variability, while SB220 showed ample variability and it is therefore, not advisable to use in clinical practice.
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