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        "resumen" => "<span class="elsevierStyleSectionTitle">Objective</span><p class="elsevierStyleSimplePara elsevierViewall">TO compare values reflecting oxyhemoglobin saturation obtained by pulse oximetry &#40;SpO<span class="elsevierStyleInf">2</span>&#41; and values for end-tidal carbon dioxide pressure &#40;PETCO<span class="elsevierStyleInf">2</span>&#41; obtained by capnography with direct measures of gas saturation values and pressures &#40;PaO<span class="elsevierStyleInf">2</span> and PaCO<span class="elsevierStyleInf">2</span>&#41; in arterial blood gas samples&#46;</p> <span class="elsevierStyleSectionTitle">Patients and methods</span><p class="elsevierStyleSimplePara elsevierViewall">&#58; We studied 57 consecutive patients ranging in age from 34 to 83 years&#8212;16 of whom were smokers&#8212;who presented for lung function testing&#46;</p> <span class="elsevierStyleSectionTitle">Results</span><p class="elsevierStyleSimplePara elsevierViewall">The mean &#40;SD&#41; SpO<span class="elsevierStyleInf">2</span> was 95&#37; &#40;2&#46;4&#37;&#41;&#44; and oxygen saturation measured directly in arterial blood samples was 95&#46;1&#37; &#40;2&#46;3&#37;&#41; &#40;<span class="elsevierStyleItalic">P</span> &#61; NS&#41;&#46; The mean PETCO<span class="elsevierStyleInf">2</span> was 37&#46;9 &#40;5&#46;3&#41; mm Hg and PaCO<span class="elsevierStyleInf">2</span> by arterial blood gas analysis was 40&#46;6 &#40;5&#46;4&#41; mm Hg &#40;<span class="elsevierStyleItalic">P</span> &#60;&#46;0001&#41;&#46; The correlation between the 2 measurements of oxygen saturation &#40;SpO<span class="elsevierStyleInf">2</span> and direct assessment&#41; was 0&#46;806 &#40;<span class="elsevierStyleItalic">P</span> &#60;&#46;0001&#41;&#44; and the correlation between PETCO<span class="elsevierStyleInf">2</span> and PaCO<span class="elsevierStyleInf">2</span> was 0&#46;845 &#40;<span class="elsevierStyleItalic">P</span> &#60;&#46;0001&#41;&#46; The mean difference between the 2 expressions of oxygen saturation was 0&#46;08&#37; &#40;1&#46;46&#37;&#41; and between PETCO<span class="elsevierStyleInf">2</span> and PaCO<span class="elsevierStyleInf">2</span> was 2&#46;7 &#40;2&#46;9&#41; mm Hg&#46;</p> <span class="elsevierStyleSectionTitle">Conclusion</span><p class="elsevierStyleSimplePara elsevierViewall">Both measurement devices &#40;pulse oximeter and capnograph&#41; are appropriate for use in a lung function laboratory&#46; The difference between PETCO<span class="elsevierStyleInf">2</span> and the PaCO<span class="elsevierStyleInf">2</span> should be kept in mind&#46;</p>"
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Journal Information
Vol. 40. Issue 7.
Pages 311-314 (July 2004)
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Vol. 40. Issue 7.
Pages 311-314 (July 2004)
Original Articles
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Pulse Oximetry and Capnography in Lung Function Laboratories
Visits
4589
J. Giner
Corresponding author
jginer@hsp.santpau.es

Correspondence: Dr. J. Giner. Unitat de Funció Pulmonar. Hospital de la Santa Creu i de Sant Pau. Avda. Antoni M. Claret, 167. 08025 Barcelona. España
, P. Casan
Unitat de Funció Pulmonar, Departament de Pneumologia, Hospital de la Santa Creu i de Sant Pau, Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
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Article information
Objective

TO compare values reflecting oxyhemoglobin saturation obtained by pulse oximetry (SpO2) and values for end-tidal carbon dioxide pressure (PETCO2) obtained by capnography with direct measures of gas saturation values and pressures (PaO2 and PaCO2) in arterial blood gas samples.

Patients and methods

: We studied 57 consecutive patients ranging in age from 34 to 83 years—16 of whom were smokers—who presented for lung function testing.

Results

The mean (SD) SpO2 was 95% (2.4%), and oxygen saturation measured directly in arterial blood samples was 95.1% (2.3%) (P = NS). The mean PETCO2 was 37.9 (5.3) mm Hg and PaCO2 by arterial blood gas analysis was 40.6 (5.4) mm Hg (P <.0001). The correlation between the 2 measurements of oxygen saturation (SpO2 and direct assessment) was 0.806 (P <.0001), and the correlation between PETCO2 and PaCO2 was 0.845 (P <.0001). The mean difference between the 2 expressions of oxygen saturation was 0.08% (1.46%) and between PETCO2 and PaCO2 was 2.7 (2.9) mm Hg.

Conclusion

Both measurement devices (pulse oximeter and capnograph) are appropriate for use in a lung function laboratory. The difference between PETCO2 and the PaCO2 should be kept in mind.

Key Words:
Pulse oximetry
Capnography
Oxyhemoglobin
PaCO2
Objetivo

Comparar los valores de oxihemoglobina, obtenidos mediante un pulsioxímetro, y de presión arterial de anhídrido carbónico (PaCO2) al final de la espiración, medida con un capnógrafo, con los obtenidos a partir de una muestra de sangre arterial (oxihemoglobina y PaCO2).

Pacientes Y Métodos

El estudio se realizó en 57 pacientes consecutivos —16 de ellos fumadores— que acudieron para un estudio de la función pulmonar, de entre 34 y 83 años años de edad.

Resultados

El valor medio (± desviación estándar) de la oxihemoglobina por pulsioximetría fue del 95 ± 2,4% y en sangre arterial del 95,1 ± 2,3% (p = NS). El valor medio de la PaCO2 al final de la espiración, medida por el capnógrafo, fue de 37,9 ± 5,3 mmHg y el de la PaCO2 en sangre arterial de 40,6 ± 5,4 mmHg (p < 0,0001). El coeficiente de correlación entre las 2 determinaciones de oxihemoglobina fue de 0,806 (p < 0,0001) y entre la PaCO2 al final de la espiración y la PaCO2 en sangre arterial fue de 0,845 (p < 0,0001). La media de las diferencias entre ambos valores de oxihemoglobina fue del 0,08 ± 1,46%, y entre la PaCO2 al final de la espiración y la PaCO2 fue de 2,7 ± 2,9 mmHg.

Conclusión

Ambos equipos de lectura (pulsioxímetro y capnógrafo) han demostrado ser correctos para su uso en el laboratorio de función pulmonar. Deben tenerse en cuenta las diferencias apreciadas entre la PaCO2 al final de la espiración y la PaCO2 arterial.

Palabras clave:
Pulsioxímetro
Capnógrafo
Oxihemoglobina
PaCO2
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REFERENCES
[1]
JE Cotes.
Lung function. Assessment and application in medicine, 5th ed., pp. 263-298
[2]
L Martin.
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