<?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>0028-3746</journal-id>
<journal-title><![CDATA[Neumología y cirugía de tórax]]></journal-title>
<abbrev-journal-title><![CDATA[Neumol. cir. torax]]></abbrev-journal-title>
<issn>0028-3746</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Neumología y Cirugía de Tórax; Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas; Sociedad Cubana de Neumología; Sociedad Paraguaya de Neumología; Sociedad Boliviana de Neumología.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0028-37462023000200072</article-id>
<article-id pub-id-type="doi">10.35366/115393</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Utility of Balik&#8217;s formula for the quantification of pleural effusion by ultrasound in the postoperative period of cardiac surgery]]></article-title>
<article-title xml:lang="es"><![CDATA[Utilidad de la fórmula de Balik para la cuantificación del derrame pleural por ultrasonido en el posoperatorio de cirugía cardiaca]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Rodríguez]]></surname>
<given-names><![CDATA[Camelia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Cruz]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gopar-Nieto]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lazcano-Díaz]]></surname>
<given-names><![CDATA[Emmanuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ordaz-Figueroa]]></surname>
<given-names><![CDATA[Diana Lizbeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Elizalde-Silva]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Velasco]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manzur-Sandoval]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez  ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>82</volume>
<numero>2</numero>
<fpage>72</fpage>
<lpage>78</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0028-37462023000200072&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0028-37462023000200072&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0028-37462023000200072&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  pleural effusion is caused by an imbalance between oncotic and hydrostatic pressure through the pulmonary capillaries or by increased permeability. Ultrasound at the patient&#8217;s bedside allows for efficient diagnosis in various areas, due to its portability and low cost, enabling the quantification of pleural fluid, determination of its characteristics, and guidance for percutaneous drainage. Post cardiac surgery, large pleural effusions can affect the patient&#8217;s recovery journey.  Material and methods:  we conducted a cross-sectional study of 26 nonconsecutive adult patients who underwent cardiac surgery in whom pleural effusion was detected by ultrasound in the postoperative period. The pleural effusion volume, quantified by Balik&#8217;s formula, correlated with the amount of pleural fluid drained. In addition, the characteristics of the fluid were defined to determine any correlation with Light&#8217;s criteria.  Results:  there was a strong positive correlation between the volume quantified by Balik&#8217;s formula and the amount of pleural fluid drained. We also found that the characteristics of drained pleural effusion, as determined through ultrasound, had sufficient diagnostic accuracy to differentiate between transudate and exudate compared with Light&#8217;s criteria.  Conclusions:  there is a strong positive correlation between the fluid volume quantified by ultrasound with Balik&#8217;s formula and the volume drained in the postoperative period of cardiac surgery, in addition to high diagnostic accuracy in the identification of the fluid as transudate or exudate.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  el derrame pleural es causado por un desequilibrio entre la presión oncótica e hidrostática a través de los capilares pulmonares o por un aumento de la permeabilidad. La ecografía a pie de cama del paciente permite un diagnóstico eficiente en diversas áreas, por su portabilidad y bajo costo, posibilitando la cuantificación del líquido pleural, determinación de sus características y orientación para el drenaje percutáneo. Después de una cirugía cardíaca, los derrames pleurales grandes pueden afectar el proceso de recuperación del paciente.  Material y métodos:  realizamos un estudio transversal de 26 pacientes adultos no consecutivos intervenidos de cirugía cardíaca en quienes se detectó derrame pleural mediante ecografía en el posoperatorio. El volumen del derrame pleural, cuantificado por la fórmula de Balik, se correlacionó con la cantidad de líquido pleural drenado. Además, se definieron las características del fluido para determinar cualquier correlación con los criterios de Light.  Resultados:  hubo una fuerte correlación positiva entre el volumen cuantificado por la fórmula de Balik y la cantidad de líquido pleural drenado. También encontramos que las características del derrame pleural drenado, determinadas por ultrasonido, tenían suficiente precisión diagnóstica para diferenciar entre trasudado y exudado en comparación con los criterios de Light.  Conclusiones:  existe una fuerte correlación positiva entre el volumen de líquido cuantificado por ultrasonido con la fórmula de Balik y el volumen drenado en el posoperatorio de cirugía cardíaca, además de una alta precisión diagnóstica en la identificación del líquido como trasudado o exudado.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[pleural effusion]]></kwd>
<kwd lng="en"><![CDATA[lung ultrasound]]></kwd>
<kwd lng="en"><![CDATA[point-of-care ultrasound]]></kwd>
<kwd lng="es"><![CDATA[derrame pleural]]></kwd>
<kwd lng="es"><![CDATA[ecografía pulmonar]]></kwd>
<kwd lng="es"><![CDATA[ecografía en el punto de atención]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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