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Differences in partial oxygen saturation obtained from three pulse oximeters
Luis Efrén Santos-Martínez1, Martha Vianey Ureña-Plascencia2, Javier Quevedo-Paredes2
1Instituto Mexicano del Seguro Social, Centro Médico Nacional Siglo XXI, Hospital de Cardiología, Departamento de Hipertensión Pulmonar y Corazón Derecho.
IntroduccióN:
Se estima que existe variabilidad en la medición de la saturación parcial de oxígeno entre distintos oxímetros de pulso.
Objetivo:
Conocer la variabilidad de la medición de acuerdo con el oxímetro de pulso utilizado en la práctica clínica.
Material Y MéTodos:
Diseño transversal, sujetos consecutivos. Se obtuvieron variables demográficas, ocupación y enfermedad. Se estimaron las diferencias en la variabilidad de tres oxímetros de pulso. Las variables nominales se informaron con frecuencias y porcentajes; las numéricas, con promedios y desviación estándar. La variabilidad se calculó con el estadístico de Bland-Altman y su magnitud con el coeficiente de correlación intraclase (intervalo de confianza del 95%).
Resultados:
Se estudiaron 255 pacientes con una edad promedio de 61 ± 15 años y un índice de masa corporal de 30.28 ± 6.59 kg/m2, de los cuales 145 (56.8%) fueron mujeres y 136 (53.33%) tuvieron hábito tabáquico. La ocupación y la enfermedad con mayor frecuencia fueron obrero (98; 38.43%) y enfermedad pulmonar obstructiva crónica (143; 56.08%). El promedio grupal de saturación arterial de oxígeno frente a saturación parcial de oxígeno fue de 91.28 ± 4.07% frente a 90.64 ± 3.89% (p < 0.0001). La diferencia media (límites de acuerdo) y el coeficiente de correlación intraclase (intervalo de confianza del 95%) fueron, respectivamente, para los tres oxímetros: Onyx II -0.5 (3.4, -4.3) y 0.949 (0.935, 0.960), Hergom 0.2 (3.4, -2.9) y 0.951 (0.937, 0.962), y Rossmax SB220 -1.6 (36.2, -39.5) y 0.784 (0.724, 0.831).
Conclusiones:
Los oxímetros de pulso Onyx II y Hergom tuvieron menor variabilidad, mientras que el Rossmax SB220 la tuvo muy amplia, por lo que no resulta aconsejable para uso clínico.
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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