<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-9532</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. ing. bioméd]]></abbrev-journal-title>
<issn>0188-9532</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ingeniería Biomédica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-95322024000200002</article-id>
<article-id pub-id-type="doi">10.17488/rmib.45.2.2</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Involvement of the Lung Parenchyma Analyzed by Frequency Components of the Tidal Volume Assessed by Electrical Bioimpedance]]></article-title>
<article-title xml:lang="es"><![CDATA[Afectación del Parénquima Pulmonar Analizada por Medio de las Componentes de Frecuencia del Volumen Tidal Evaluado por Bioimpedancia Eléctrica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas Luna]]></surname>
<given-names><![CDATA[Francisco Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgadillo Cano]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Riu Costa]]></surname>
<given-names><![CDATA[Pere Joan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kashina]]></surname>
<given-names><![CDATA[Svetlana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Balleza Ordaz]]></surname>
<given-names><![CDATA[José Marco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guanajuato  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universitat Politécnica de Catalunya Electronics and Biomedical Instrumentation Department ]]></institution>
<addr-line><![CDATA[ Barcelona]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2024</year>
</pub-date>
<volume>45</volume>
<numero>2</numero>
<fpage>23</fpage>
<lpage>34</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-95322024000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-95322024000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-95322024000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Pulmonary function tests are vital for detecting pathologies, especially chronic obstructive pulmonary diseases (COPD), emphasizing the importance of assessing lung parenchyma involvement in maintaining proper gas exchange. Electrical impedance tomography (EIT) offers a non-invasive alternative for respiratory function evaluation while preserving natural breathing. We propose using EIT to detect lung parenchyma conditions by analyzing tidal volume patterns (by averaging the impedance image) in the frequency domain. Twenty COPD patients underwent simultaneous evaluation with a pneumotachometer and an EIT device, performing three 30-second respiratory maneuvers. FFT spectra analysis yielded parameters, including the area under the curve and quartiles (25 %, 50 %, 75 %) of power values in six frequency regions. Correlations between these parameters and clinical test results (pulmonary diffusing capacity and arterial blood gas analysis) revealed significant associations, particularly with PCO2. Multiple linear regression analysis predicted PCO2 with an R2adj = 0.827, suggesting the potential for noninvasively detecting lung parenchyma affectation by correlating FFT bioimpedance ventilatory patterns with gas exchange performance in COPD patients.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las pruebas de función pulmonar son fundamentales para detectar patologías, especialmente enfermedades pulmonares obstructivas crónicas (EPOC), destacando la importancia de evaluar la participación del parénquima pulmonar en el mantenimiento adecuado del intercambio gaseoso. La tomografía por la bioimpedancia eléctrica (TIE) ofrece una alternativa no invasiva para la evaluación de la función respiratoria mientras se conserva la respiración natural. Proponemos utilizar la TIE para detectar condiciones del parénquima pulmonar mediante el análisis de patrones de volumen tidal en el dominio de frecuencia. Veinte pacientes con EPOC fueron evaluados simultáneamente con un neumotacómetro y un dispositivo de TIE, realizando tres maniobras respiratorias de 30 segundos cada una. El análisis de espectros FFT proporcionó parámetros, incluyendo el área bajo la curva y los cuartiles (25 %, 50 %, 75 %) de los valores de potencia en seis regiones de frecuencia. Las correlaciones entre estos parámetros y los resultados de pruebas clínicas (capacidad de difusión pulmonar y análisis de gases en sangre arterial) revelaron asociaciones significativas, especialmente con PCO2. El análisis de regresión lineal múltiple predijo PCO2 con un R2adj = 0.827, sugiriendo la posibilidad de detectar de manera no invasiva la afectación del parénquima pulmonar al correlacionar los patrones ventilatorios de bioimpedancia FFT con el rendimiento del intercambio gaseoso en pacientes con EPOC.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[COPD]]></kwd>
<kwd lng="en"><![CDATA[electrical impedance tomography]]></kwd>
<kwd lng="en"><![CDATA[lungs]]></kwd>
<kwd lng="en"><![CDATA[pulmonary function testing]]></kwd>
<kwd lng="es"><![CDATA[EPOC]]></kwd>
<kwd lng="es"><![CDATA[pulmón]]></kwd>
<kwd lng="es"><![CDATA[test de funciones pulmonares]]></kwd>
<kwd lng="es"><![CDATA[tomografía por impedancia eléctrica]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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