<?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>S0028-37462017000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Procalcitonina sérica como biomarcador diagnóstico de derrame paraneumónico o empiema]]></article-title>
<article-title xml:lang="en"><![CDATA[Procalcitonin as diagnostic biomarker of parapneumonic pleural effusion or empyema]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega-Sánchez]]></surname>
<given-names><![CDATA[Ángel Emmanuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Che-Morales]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Mendoza]]></surname>
<given-names><![CDATA[Gary Kosai]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manjarrez-Martín]]></surname>
<given-names><![CDATA[Danielle Aimee]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés-Telles]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Regional de Alta Especialidad de la Península de Yucatán  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>76</volume>
<numero>1</numero>
<fpage>7</fpage>
<lpage>13</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0028-37462017000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0028-37462017000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0028-37462017000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes:  La relevancia del derrame paraneumónico (DPN) y empiema, radica en su morbimortalidad y tendencia ascendente. Recién ha tomado interés la exploración de nuevos biomarcadores capaces de incidir en su desenlace. La procalcitonina (PCT) es un sólido marcador de infección sistémica; sin embargo, son escasos los trabajos que describen su comportamiento en DPN y empiema. Este estudio exploró si la PCT tiene un papel en el abordaje diagnóstico del derrame pleural unilateral de causa infecciosa manifestado como DPN y/o empiema.  Material y métodos:  Diseñamos un estudio clínico observacional prospectivo que incluyó a pacientes ingresados a nuestra institución con derrame pleural unilateral por un período de 18 meses. Se analizó el contraste del valor absoluto de PCT sérica en dos grupos de estudio y la probabilidad de predecir infección definida como DPN y/o empiema.  Resultados:  Se incluyeron 49 pacientes divididos en dos grupos (infeccioso vs. no infeccioso). Al ingreso, el valor de PCT sérica fue diferente entre ambos grupos (1.42 ng/mL vs. 0.83 ng/mL). El análisis de regresión identificó que PCT sérica tuvo adecuada asociación con infección pleural. El valor de PCT que mejor discriminó este hallazgo fue &#8805; 2 ng/mL, OR 4.1 (IC 95% 1.1-15.3; p = 0.038).  Conclusiones:  Procalcitonina es un biomarcador sérico útil en el diagnóstico de infección pleural. Sin embargo, deben realizarse más estudios para comprobar nuestros resultados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  The relevance of parapneumonic effusion (DPN) and empyema lies in it&#8217;s morbidity and mortality and the upward trend. It has recently taken interest in exploring new biomarkers able to influence its outcome. Procalcitonin is a solid marker of systemic infection, however, few studies describe the role in DPN and empyema. The current study analyzed if procalcitonin has a role in the approach of unilateral pleural effusion such as parapneumonic pleural effusion and/or empyema.  Material and methods:  We designed a prospective observational clinical study involving patients admitted to our institution with unilateral pleural effusion for a period of 18 months. The contrast of the absolute value of serum PCT in 2 groups of study and the ability to discriminate infection such as parapneumonic pleural effusion and/or empyema was analyzed.  Results:  49 patients divided into 2 groups (infectious vs. noninfectious) were included. At admission, the value of serum PCT was different between the two groups (1.42 ng/mL vs. 0.83 ng/mL). Regression analysis identified that serum PCT had adequate association with pleural infection. The PCT value that best discriminated this finding was &#8805; 2 ng/mL, OR 4.1 (95% CI 1.1-15.3; p = 0.038).  Conclusions:  Procalcitonin is a useful serum biomarker in the diagnosis of pleural infection. However, more studies should be performed to reinforce our results.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biomarcadores]]></kwd>
<kwd lng="es"><![CDATA[derrame paraneumónico]]></kwd>
<kwd lng="es"><![CDATA[neumonía]]></kwd>
<kwd lng="es"><![CDATA[procalcitonina]]></kwd>
<kwd lng="en"><![CDATA[Biomarkers]]></kwd>
<kwd lng="en"><![CDATA[parapneumonic effusion]]></kwd>
<kwd lng="en"><![CDATA[pneumonia]]></kwd>
<kwd lng="en"><![CDATA[procalcitonin]]></kwd>
</kwd-group>
</article-meta>
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