Original Articles
Assessment of Differential Lung Function by Electrical Impedance Tomography
J. Bruno de Lemaa, Ernesto Serranob, Teresa Feixasa, Núria Calafa, María del Valle Camachoc, Pere J. Riub, Pere Casana,
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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
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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Bruno de Lema, Ernesto Serrano, Teresa Feixas, Núria Calaf, María del Valle Camacho, Pere J. Riu, Pere Casan" "autores" => array:7 [ 0 => array:3 [ "nombre" => "J." "apellidos" => "Bruno de Lema" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] ] ] 1 => array:3 [ "nombre" => "Ernesto" "apellidos" => "Serrano" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff2" ] ] ] 2 => array:3 [ "nombre" => "Teresa" "apellidos" => "Feixas" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] ] ] 3 => array:3 [ "nombre" => "Núria" "apellidos" => "Calaf" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] ] ] 4 => array:3 [ "nombre" => "María" "apellidos" => "del Valle Camacho" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff3" ] ] ] 5 => array:3 [ "nombre" => "Pere J." "apellidos" => "Riu" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff2" ] ] ] 6 => array:4 [ "nombre" => "Pere" "apellidos" => "Casan" "email" => array:1 [ 0 => "pcasan@santpau.es" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor1" ] ] ] ] "afiliaciones" => array:3 [ 0 => array:3 [ "entidad" => "Unitat de Funció Pulmonar, Departament de Pneumologia, Hospital de la Santa Creu i Sant Pau, Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain" "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff1" ] 1 => array:3 [ "entidad" => "Centre de Recerca en Enginyeria Biomèdica (CREB), Universitat Politècnica de Catalunya, Barcelona, Spain" "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff2" ] 2 => array:3 [ "entidad" => "Servei de Medicina Nuclear, Hospital de la Santa Creu i Sant Pau, Facultat de Medicina, Universitat Autònoma de Barcelona, Barcelona, Spain" "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff3" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "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" ] ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2007-07-05" "fechaAceptado" => "2007-11-20" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Key words" "identificador" => "xpalclavsec155340" "palabras" => array:3 [ 0 => "Differential lung function" 1 => "Electrical impedance tomography" 2 => "Lung cancer" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec155341" "palabras" => array:3 [ 0 => "Función pulmonar unilateral" 1 => "Tomografía por impedancia eléctrica" 2 => "Cáncer de pulmón" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:1 [ "resumen" => "<span class="elsevierStyleSectionTitle">Objective</span><p class="elsevierStyleSimplePara elsevierViewall">To compare differential lung function estimated by 2 methods: electrical impedance tomography (EIT) and ventilation-perfusion lung scintigraphy.</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. 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.</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. Each lung's contribution to overall respiratory function was also calculated based on scintigraphy.</p> <span class="elsevierStyleSectionTitle">Results</span><p class="elsevierStyleSimplePara elsevierViewall">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 <span class="elsevierStyleItalic">r</span> = 0.90 for ventilation and <span class="elsevierStyleItalic">r</span>=0.72 for perfusion (<span class="elsevierStyleItalic">P</span><.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.</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p class="elsevierStyleSimplePara elsevierViewall">EIT is able to estimate differential lung function as accurately as ventilation-perfusion scintigraphy.</p>" ] "es" => array:1 [ "resumen" => "<span class="elsevierStyleSectionTitle">Objetivo</span><p class="elsevierStyleSimplePara elsevierViewall">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</p> <span class="elsevierStyleSectionTitle">Pacientes y métodos</span><p class="elsevierStyleSimplePara elsevierViewall">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.</p><p class="elsevierStyleSimplePara elsevierViewall">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.</p> <span class="elsevierStyleSectionTitle">Resultados</span><p class="elsevierStyleSimplePara elsevierViewall">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.</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p class="elsevierStyleSimplePara elsevierViewall">La TIE es capaz de cuantificar la FPU con una precisión similar a la gammagrafía de ventilación o perfusión con radioisótopos.</p>" ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:1 [ "bibliografiaReferencia" => array:16 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "The physiologic evaluation of patients with lung cancer being considered for resectional surgery" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:4 [ 0 => "MA Beckles" 1 => "SG Spiro" 2 => "GL Colice" 3 => "RM Rudd" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:6 [ "tituloSerie" => "Chest" "fecha" => "2003" "volumen" => "123" "numero" => "Suppl 1" "paginaInicial" => "105" "paginaFinal" => "114" ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Temporary unilateral occlusion of the pulmonary artery; 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| Year/Month | Html | Total | |
|---|---|---|---|
| 2024 November | 3 | 1 | 4 |
| 2024 October | 28 | 17 | 45 |
| 2024 September | 34 | 11 | 45 |
| 2024 August | 39 | 35 | 74 |
| 2024 July | 28 | 23 | 51 |
| 2024 June | 30 | 23 | 53 |
| 2024 May | 36 | 20 | 56 |
| 2024 April | 24 | 26 | 50 |
| 2024 March | 26 | 17 | 43 |
| 2024 February | 31 | 15 | 46 |
| 2023 March | 3 | 3 | 6 |
| 2023 February | 20 | 23 | 43 |
| 2023 January | 18 | 32 | 50 |
| 2022 December | 23 | 36 | 59 |
| 2022 November | 28 | 25 | 53 |
| 2022 October | 23 | 26 | 49 |
| 2022 September | 23 | 26 | 49 |
| 2022 August | 24 | 45 | 69 |
| 2022 July | 26 | 52 | 78 |
| 2022 June | 18 | 33 | 51 |
| 2022 May | 26 | 35 | 61 |
| 2022 April | 20 | 35 | 55 |
| 2022 March | 28 | 37 | 65 |
| 2022 February | 21 | 27 | 48 |
| 2022 January | 19 | 30 | 49 |
| 2021 December | 19 | 50 | 69 |
| 2021 November | 24 | 48 | 72 |
| 2021 October | 17 | 51 | 68 |
| 2021 September | 20 | 53 | 73 |
| 2021 August | 9 | 48 | 57 |
| 2021 July | 13 | 34 | 47 |
| 2021 June | 23 | 38 | 61 |
| 2021 May | 17 | 31 | 48 |
| 2021 April | 45 | 102 | 147 |
| 2021 March | 24 | 34 | 58 |
| 2021 February | 13 | 22 | 35 |
| 2021 January | 15 | 19 | 34 |
| 2020 December | 9 | 28 | 37 |
| 2020 November | 12 | 16 | 28 |
| 2020 October | 15 | 19 | 34 |
| 2020 September | 5 | 9 | 14 |
| 2020 August | 13 | 15 | 28 |
| 2020 July | 14 | 25 | 39 |
| 2020 June | 10 | 4 | 14 |
| 2020 May | 15 | 14 | 29 |
| 2020 April | 13 | 25 | 38 |
| 2020 March | 23 | 10 | 33 |
| 2020 February | 19 | 12 | 31 |
| 2020 January | 22 | 17 | 39 |
| 2019 December | 21 | 17 | 38 |
| 2019 November | 13 | 13 | 26 |
| 2019 October | 11 | 9 | 20 |
| 2019 September | 5 | 13 | 18 |
| 2019 August | 16 | 12 | 28 |
| 2019 July | 11 | 17 | 28 |
| 2019 June | 7 | 6 | 13 |
| 2019 May | 14 | 13 | 27 |
| 2019 April | 43 | 14 | 57 |
| 2019 March | 22 | 21 | 43 |
| 2019 February | 18 | 16 | 34 |
| 2019 January | 21 | 12 | 33 |
| 2018 December | 15 | 22 | 37 |
| 2018 November | 39 | 17 | 56 |
| 2018 October | 33 | 24 | 57 |
| 2018 September | 12 | 10 | 22 |
| 2018 May | 4 | 0 | 4 |
| 2018 April | 21 | 12 | 33 |
| 2018 March | 6 | 4 | 10 |
| 2018 February | 7 | 8 | 15 |
| 2018 January | 10 | 11 | 21 |
| 2017 December | 8 | 8 | 16 |
| 2017 November | 3 | 9 | 12 |
| 2017 October | 8 | 9 | 17 |
| 2017 September | 3 | 12 | 15 |
| 2017 August | 5 | 9 | 14 |
| 2017 July | 13 | 13 | 26 |
| 2017 June | 8 | 13 | 21 |
| 2017 May | 7 | 10 | 17 |
| 2017 April | 3 | 4 | 7 |
| 2017 March | 6 | 24 | 30 |
| 2017 February | 4 | 8 | 12 |
| 2017 January | 2 | 4 | 6 |
| 2016 December | 8 | 8 | 16 |
| 2016 November | 12 | 5 | 17 |
| 2016 October | 16 | 9 | 25 |
| 2016 September | 15 | 9 | 24 |
| 2016 August | 12 | 3 | 15 |
| 2016 July | 10 | 5 | 15 |
| 2016 March | 1 | 0 | 1 |
| 2016 February | 1 | 0 | 1 |
| 2015 December | 2 | 0 | 2 |
| 2015 October | 72 | 11 | 83 |
| 2015 September | 65 | 11 | 76 |
| 2015 August | 49 | 15 | 64 |
| 2015 July | 58 | 8 | 66 |
| 2015 June | 53 | 4 | 57 |
| 2015 May | 54 | 7 | 61 |
| 2015 April | 53 | 6 | 59 |
| 2015 March | 53 | 7 | 60 |
| 2015 February | 53 | 5 | 58 |
| 2015 January | 44 | 4 | 48 |
| 2014 December | 50 | 6 | 56 |
| 2014 November | 50 | 7 | 57 |
| 2014 October | 64 | 11 | 75 |
| 2014 September | 40 | 8 | 48 |
| 2014 August | 53 | 11 | 64 |
| 2014 July | 50 | 8 | 58 |
| 2014 June | 65 | 10 | 75 |
| 2014 May | 71 | 10 | 81 |
| 2014 April | 83 | 7 | 90 |
| 2014 March | 58 | 11 | 69 |
| 2014 February | 61 | 9 | 70 |
| 2014 January | 39 | 8 | 47 |
| 2013 December | 48 | 13 | 61 |
| 2013 November | 38 | 8 | 46 |
| 2013 October | 52 | 8 | 60 |
| 2013 September | 45 | 10 | 55 |
| 2013 August | 42 | 8 | 50 |
| 2013 July | 62 | 12 | 74 |
| 2013 June | 33 | 8 | 41 |
| 2013 May | 44 | 6 | 50 |
| 2013 April | 31 | 4 | 35 |
| 2013 March | 10 | 3 | 13 |
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