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        "resumen" => "<span class="elsevierStyleSectionTitle">Objective</span><p class="elsevierStyleSimplePara elsevierViewall">To compare differential lung function estimated by 2 methods&#58; electrical impedance tomography &#40;EIT&#41; and ventilation-perfusion lung scintigraphy&#46;</p> <span class="elsevierStyleSectionTitle">Patients and methods</span><p class="elsevierStyleSimplePara elsevierViewall">This prospective clinical study was carried out in the pulmonary function laboratory of a general hospital&#46; Twenty patients diagnosed with lung cancer &#40;17 men and 3 women&#44; ranging in age from 25 to 77 years&#41; who were candidates for lung resection underwent ventilation-perfusion lung scanning breathing radioactive gas&#46;</p><p class="elsevierStyleSimplePara elsevierViewall">Differential lung function was estimated based on images taken at 2 intercostal spaces in which ventilation and perfusion were represented by changes in bioelectrical impedance&#46; Each lung&#39;s contribution to overall respiratory function was also calculated based on scintigraphy&#46;</p> <span class="elsevierStyleSectionTitle">Results</span><p class="elsevierStyleSimplePara elsevierViewall">The right lung contributed a mean &#40;SD&#41; of 54&#37; &#40;9&#37;&#41; of ventilation &#40;range&#44; 32&#37;-71&#37;&#41; according to EIT&#46; Scintigraphy similarly estimated the right lung&#39;s contribution to be 52&#37; &#40;10&#37;&#41; of total ventilation &#40;range&#44; 31&#37;-80&#37;&#41; and 50&#37; &#40;9&#37;&#41; of perfusion &#40;range&#44; 37&#37;-71&#37;&#41;&#46; The difference between the 2 estimates was not significant &#40;t test&#41;&#44; and the correlation coefficients between them were <span class="elsevierStyleItalic">r</span> &#61; 0&#46;90 for ventilation and <span class="elsevierStyleItalic">r</span>&#61;0&#46;72 for perfusion &#40;<span class="elsevierStyleItalic">P</span>&#60;&#46;05 in both cases&#41;&#46; The analysis of agreement showed that the mean difference between the methods was 1&#46;9&#37; &#40;95&#37; confidence interval &#91;CI&#93;&#44; 10&#46;5&#37; to &#8722;6&#46;8&#37;&#41; for ventilation and 3&#46;4&#37; &#40;95&#37; CI&#44; 17&#46;1&#37; to &#8722;10&#46;3&#37;&#41; for perfusion&#46;</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p class="elsevierStyleSimplePara elsevierViewall">EIT is able to estimate differential lung function as accurately as ventilation-perfusion scintigraphy&#46;</p>"
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        "resumen" => "<span class="elsevierStyleSectionTitle">Objetivo</span><p class="elsevierStyleSimplePara elsevierViewall">Comparar la funci&#243;n pulmonar unilateral &#40;FPU&#41; estimada mediante tomograf&#237;a por impedancia el&#233;ctrica &#40;TIE&#41; con la misma determinaci&#243;n obtenida a partir de la gammagraf&#237;a de ventilaci&#243;n y perfusi&#243;n pulmonar</p> <span class="elsevierStyleSectionTitle">Pacientes y m&#233;todos</span><p class="elsevierStyleSimplePara elsevierViewall">Se trata de un estudio cl&#237;nico prospectivo&#44; realizado en un laboratorio de funci&#243;n pulmonar de un hospital general&#46; Se incluy&#243; a 20 pacientes diagnosticados de c&#225;ncer de pulm&#243;n &#40;17 varones y 3 mujeres&#44; con edades comprendidas entre los 25 y los 77 a&#241;os&#41;&#44; candidatos a cirug&#237;a resectiva pulmonar&#44; a quienes se realiz&#243; un estudio de ventilaci&#243;n&#47;perfusi&#243;n pulmonar con radiois&#243;topos&#46;</p><p class="elsevierStyleSimplePara elsevierViewall">La FPU se calcul&#243; a partir de im&#225;genes en 2 espacios intercostales en las que se representaban la ventilaci&#243;n y la perfusi&#243;n relacionadas con los cambios en la bioimpedancia el&#233;ctrica&#46; Se determin&#243; asimismo la participaci&#243;n de cada pulm&#243;n en la funci&#243;n global a partir de estudios isot&#243;picos&#46;</p> <span class="elsevierStyleSectionTitle">Resultados</span><p class="elsevierStyleSimplePara elsevierViewall">El valor promedio &#177; desviaci&#243;n est&#225;ndar de ventilaci&#243;n en el pulm&#243;n derecho obtenido mediante TIE fue del 54 &#177; 9&#37; &#40;rango&#58; 32&#8211;71&#37;&#41;&#46; El mismo valor mediante radiois&#243;topos fue del 52 &#177; 10&#37; &#40;rango&#58; 31&#8211;80&#37;&#41; para la ventilaci&#243;n y del 50 &#177; 9&#37; &#40;rango&#58; 37&#8211;71&#37;&#41; para la perfusi&#243;n &#40;prueba de la t de Student&#44; p no significativa&#41;&#46; El coeficiente de correlaci&#243;n entre ambas determinaciones fue de r &#61; 0&#44;90 &#40;p &#60; 0&#44;05&#41; para la ventilaci&#243;n y de r &#61; 0&#44;72 &#40;p &#60; 0&#44;05&#41; para la perfusi&#243;n&#46; El an&#225;lisis de concordancia mostr&#243; una media de las diferencias del 1&#44;9&#37; &#40;intervalo de confianza del 95&#37;&#44; del 10&#44;5 al &#8722;6&#44;8&#37;&#41; para la ventilaci&#243;n y del 3&#44;4&#37; &#40;intervalo de confianza del 95&#37;&#44; entre el 17&#44;1 y el &#8722;10&#44;3&#37;&#41; para la perfusi&#243;n&#46;</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p class="elsevierStyleSimplePara elsevierViewall">La TIE es capaz de cuantificar la FPU con una precisi&#243;n similar a la gammagraf&#237;a de ventilaci&#243;n o perfusi&#243;n con radiois&#243;topos&#46;</p>"
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Vol. 44. Issue 8.
Pages 408-412 (January 2008)
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Vol. 44. Issue 8.
Pages 408-412 (January 2008)
Original Articles
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Assessment of Differential Lung Function by Electrical Impedance Tomography
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J. Bruno de Lemaa, Ernesto Serranob, Teresa Feixasa, Núria Calafa, María del Valle Camachoc, Pere J. Riub, Pere Casana,
Corresponding author
pcasan@santpau.es

Correspondence: Dr P. Casan Unitat de Funció Pulmonar, Departament de Pneumologia Hospital de la Santa Creu i Sant Pau Sant Antoni Maria Claret, 167 08025 Barcelona, Spain
a Unitat de Funció Pulmonar, Departament de Pneumologia, Hospital de la Santa Creu i Sant Pau, Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
b Centre de Recerca en Enginyeria Biomèdica (CREB), Universitat Politècnica de Catalunya, Barcelona, Spain
c Servei de Medicina Nuclear, Hospital de la Santa Creu i Sant Pau, Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain
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Abstract
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Objective

To compare differential lung function estimated by 2 methods: electrical impedance tomography (EIT) and ventilation-perfusion lung scintigraphy.

Patients and methods

This prospective clinical study was carried out in the pulmonary function laboratory of a general hospital. Twenty patients diagnosed with lung cancer (17 men and 3 women, ranging in age from 25 to 77 years) who were candidates for lung resection underwent ventilation-perfusion lung scanning breathing radioactive gas.

Differential lung function was estimated based on images taken at 2 intercostal spaces in which ventilation and perfusion were represented by changes in bioelectrical impedance. Each lung's contribution to overall respiratory function was also calculated based on scintigraphy.

Results

The right lung contributed a mean (SD) of 54% (9%) of ventilation (range, 32%-71%) according to EIT. Scintigraphy similarly estimated the right lung's contribution to be 52% (10%) of total ventilation (range, 31%-80%) and 50% (9%) of perfusion (range, 37%-71%). The difference between the 2 estimates was not significant (t test), and the correlation coefficients between them were r = 0.90 for ventilation and r=0.72 for perfusion (P<.05 in both cases). The analysis of agreement showed that the mean difference between the methods was 1.9% (95% confidence interval [CI], 10.5% to −6.8%) for ventilation and 3.4% (95% CI, 17.1% to −10.3%) for perfusion.

Conclusions

EIT is able to estimate differential lung function as accurately as ventilation-perfusion scintigraphy.

Key words:
Differential lung function
Electrical impedance tomography
Lung cancer
Objetivo

Comparar la función pulmonar unilateral (FPU) estimada mediante tomografía por impedancia eléctrica (TIE) con la misma determinación obtenida a partir de la gammagrafía de ventilación y perfusión pulmonar

Pacientes y métodos

Se trata de un estudio clínico prospectivo, realizado en un laboratorio de función pulmonar de un hospital general. Se incluyó a 20 pacientes diagnosticados de cáncer de pulmón (17 varones y 3 mujeres, con edades comprendidas entre los 25 y los 77 años), candidatos a cirugía resectiva pulmonar, a quienes se realizó un estudio de ventilación/perfusión pulmonar con radioisótopos.

La FPU se calculó a partir de imágenes en 2 espacios intercostales en las que se representaban la ventilación y la perfusión relacionadas con los cambios en la bioimpedancia eléctrica. Se determinó asimismo la participación de cada pulmón en la función global a partir de estudios isotópicos.

Resultados

El valor promedio ± desviación estándar de ventilación en el pulmón derecho obtenido mediante TIE fue del 54 ± 9% (rango: 32–71%). El mismo valor mediante radioisótopos fue del 52 ± 10% (rango: 31–80%) para la ventilación y del 50 ± 9% (rango: 37–71%) para la perfusión (prueba de la t de Student, p no significativa). El coeficiente de correlación entre ambas determinaciones fue de r = 0,90 (p < 0,05) para la ventilación y de r = 0,72 (p < 0,05) para la perfusión. El análisis de concordancia mostró una media de las diferencias del 1,9% (intervalo de confianza del 95%, del 10,5 al −6,8%) para la ventilación y del 3,4% (intervalo de confianza del 95%, entre el 17,1 y el −10,3%) para la perfusión.

Conclusiones

La TIE es capaz de cuantificar la FPU con una precisión similar a la gammagrafía de ventilación o perfusión con radioisótopos.

Palabras clave:
Función pulmonar unilateral
Tomografía por impedancia eléctrica
Cáncer de pulmón
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Copyright © 2008. Sociedad Española de Neumología y Cirugía Torácica (SEPAR)
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