<?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>1870-7203</journal-id>
<journal-title><![CDATA[Acta médica Grupo Ángeles]]></journal-title>
<abbrev-journal-title><![CDATA[Acta méd. Grupo Ángeles]]></abbrev-journal-title>
<issn>1870-7203</issn>
<publisher>
<publisher-name><![CDATA[Grupo Ángeles, Servicios de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-72032025000300254</article-id>
<article-id pub-id-type="doi">10.35366/119952</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cambios en la fracción inspiratoria de oxígeno 24 horas previas como predictor de positividad en PCR múltiplex respiratoria en pacientes con sospecha de neumonía: un estudio de casos y controles]]></article-title>
<article-title xml:lang="en"><![CDATA[Changes in the inspiratory oxygen fraction 24 hours prior as a predictor of positivity in respiratory multiplex PCR in patients with suspected pneumonia: a case-control study]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Fosado]]></surname>
<given-names><![CDATA[Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A1"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís Ayala]]></surname>
<given-names><![CDATA[Emmanuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Francés Frangos]]></surname>
<given-names><![CDATA[Estefanía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez Duarte]]></surname>
<given-names><![CDATA[Jacqueline]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esponda Prado]]></surname>
<given-names><![CDATA[Juan Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Angeles del Pedregal Dirección de Enseñanza y Servicios Clínicos ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad La Salle México Facultad Mexicana de Medicina ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>23</volume>
<numero>3</numero>
<fpage>254</fpage>
<lpage>257</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-72032025000300254&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-72032025000300254&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-72032025000300254&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  La neumonía, una de las principales causas de morbilidad y mortalidad a nivel global, destaca la urgencia de la administración temprana de antibióticos. Sin embargo, la complejidad en la identificación rápida del agente etiológico lleva a la adopción de tratamientos empíricos, a pesar de los avances en técnicas diagnósticas como la PCR múltiplex, que facilita la detección eficaz de patógenos.  Objetivo:  Determinar si los pacientes con PCR múltiplex respiratoria positiva tuvieron un mayor requerimiento de oxígeno 24 horas previas a la obtención del resultado del estudio.  Material y métodos:  Se exploró la relación entre el incremento en la necesidad de oxígeno y la positividad de la prueba de PCR múltiplex respiratoria en pacientes hospitalizados, utilizando un diseño retrospectivo, transversal y observacional de casos y controles en el Hospital Angeles Pedregal.  Resultados:  El estudio mostró una distribución equitativa de género y variadas comorbilidades entre los pacientes, se encontraron diferencias significativas en la edad y el requerimiento de oxígeno según los resultados de la PCR, sin diferencias significativas en la estancia hospitalaria o leucocitos; además, se asoció significativamente el tabaquismo con la positividad de la PCR, mientras que la mortalidad, admisión a UCI y la necesidad de ventilación mecánica no mostraron asociaciones significativas.  Conclusión:  Se ha reafirmado la importancia de la monitorización del oxígeno como indicador clínico en el diagnóstico de infecciones respiratorias y se ha ampliado la comprensión de cómo las comorbilidades y hábitos de vida impactan en la evolución y pronóstico de estas condiciones.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  Pneumonia, one of the leading causes of morbidity and mortality globally, highlights the urgency of early antibiotic administration. However, the complexity in quickly identifying the etiological agent often leads to the adoption of empirical treatments, despite advances in diagnostic techniques such as multiplex PCR, which facilitates the effective detection of pathogens and their resistances.  Objective:  To determine if patients with positive multiplex respiratory PCR had a higher requirement of oxygen 24 hours prior to obtaining the study result.  Material and methods:  This study explored the relationship between the increase in oxygen need and the positivity of the multiplex respiratory PCR test in hospitalized patients, using a retrospective, cross-sectional, case-control design at Hospital Angeles Pedregal.  Results:  The study revealed an equitable gender distribution and varied comorbidities among patients, showing significant differences in age and oxygen requirement based on PCR results, without significant differences in hospital stay or leukocyte counts; additionally, smoking was significantly associated with PCR positivity, while mortality, ICU admission, and the need for mechanical ventilation showed no significant associations.  Conclusion:  The importance of oxygen monitoring as a clinical indicator in diagnosing respiratory infections has been reaffirmed, and an understanding of how comorbidities and lifestyle habits impact the evolution and prognosis of these conditions has been expanded.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[neumonía]]></kwd>
<kwd lng="es"><![CDATA[reacción en cadena de la polimerasa múltiple]]></kwd>
<kwd lng="es"><![CDATA[consumo de oxígeno]]></kwd>
<kwd lng="es"><![CDATA[hospitalización]]></kwd>
<kwd lng="es"><![CDATA[comorbilidad]]></kwd>
<kwd lng="en"><![CDATA[pneumonia]]></kwd>
<kwd lng="en"><![CDATA[multiplex polymerase chain reaction]]></kwd>
<kwd lng="en"><![CDATA[oxygen consumption]]></kwd>
<kwd lng="en"><![CDATA[hospitalization]]></kwd>
<kwd lng="en"><![CDATA[comorbidity]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bassetti]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Mularoni]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Giacobbe]]></surname>
<given-names><![CDATA[DR]]></given-names>
</name>
<name>
<surname><![CDATA[Castaldo]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Vena]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[New antibiotics for hospital-acquired pneumonia and ventilator-associated pneumonia]]></article-title>
<source><![CDATA[Semin Respir Crit Care Med]]></source>
<year>2022</year>
<volume>43</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>280-94</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Astasio-Picado]]></surname>
<given-names><![CDATA[Á]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[FJP]]></given-names>
</name>
<name>
<surname><![CDATA[López-Sánchez]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Jurado-Palomo]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Zabala-Baños M del]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pneumonia associated with mechanical ventilation: management and preventive aspects]]></article-title>
<source><![CDATA[Appl Sci]]></source>
<year>2022</year>
<volume>12</volume>
<numero>20</numero>
<issue>20</issue>
<page-range>10633</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zaragoza]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Vidal-Cortés]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Update of the treatment of nosocomial pneumonia in the ICU]]></article-title>
<source><![CDATA[Crit Care]]></source>
<year>2020</year>
<volume>24</volume>
<page-range>383</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Papazian]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Klompas]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Luyt]]></surname>
<given-names><![CDATA[CE]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ventilator-associated pneumonia in adults: a narrative review]]></article-title>
<source><![CDATA[Intensive Care Med]]></source>
<year>2020</year>
<volume>46</volume>
<page-range>888-906</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jain]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Self]]></surname>
<given-names><![CDATA[WH]]></given-names>
</name>
<name>
<surname><![CDATA[Wunderink]]></surname>
<given-names><![CDATA[RG]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Community-acquired pneumonia requiring hospitalization among U.S. adults]]></article-title>
<source><![CDATA[N Engl J Med]]></source>
<year>2015</year>
<volume>373</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>415-27</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[SH]]></given-names>
</name>
<name>
<surname><![CDATA[Ruan]]></surname>
<given-names><![CDATA[SY]]></given-names>
</name>
<name>
<surname><![CDATA[Pan]]></surname>
<given-names><![CDATA[SC]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Performance of a multiplex PCR pneumonia panel for the identification of respiratory pathogens and the main determinants of resistance from the lower respiratory tract specimens of adult patients in intensive care units]]></article-title>
<source><![CDATA[J Microbiol Immunol Infect]]></source>
<year>2019</year>
<volume>52</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>920-8</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pulido]]></surname>
<given-names><![CDATA[MR]]></given-names>
</name>
<name>
<surname><![CDATA[Moreno-Martínez]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[González-Galán]]></surname>
<given-names><![CDATA[V]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Application of BioFire FilmArray Blood Culture Identification panel for rapid identification of the causative agents of ventilator-associated pneumonia]]></article-title>
<source><![CDATA[Clin Microbiol Infect]]></source>
<year>2018</year>
<volume>24</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1213.e1-4</page-range></nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cisneros]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Rosso-Fernández]]></surname>
<given-names><![CDATA[CM]]></given-names>
</name>
<name>
<surname><![CDATA[Roca-Oporto]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Colistin versus meropenem in the empirical treatment of ventilator-associated pneumonia (Magic Bullet study): an investigator-driven, open-label, randomized, noninferiority controlled trial]]></article-title>
<source><![CDATA[Crit Care]]></source>
<year>2019</year>
<volume>23</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>383</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[López-de-Andrés]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Albaladejo-Vicente]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[de Miguel-Diez]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gender differences in incidence and in-hospital outcomes of community-acquired, ventilator-associated and nonventilator hospital-acquired pneumonia in Spain]]></article-title>
<source><![CDATA[Int J Clin Pract]]></source>
<year>2021</year>
<volume>75</volume>
<numero>3</numero>
<issue>3</issue>
</nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brunetti]]></surname>
<given-names><![CDATA[VC]]></given-names>
</name>
<name>
<surname><![CDATA[Ayele]]></surname>
<given-names><![CDATA[HT]]></given-names>
</name>
<name>
<surname><![CDATA[Yu]]></surname>
<given-names><![CDATA[OHY]]></given-names>
</name>
<name>
<surname><![CDATA[Ernst]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Filion]]></surname>
<given-names><![CDATA[KB]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Type 2 diabetes mellitus and risk of community-acquired pneumonia: a systematic review and meta-analysis of observational studies]]></article-title>
<source><![CDATA[CMAJ Open]]></source>
<year>2021</year>
<volume>9</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>E62-70</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pant]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Prasai]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Rauniyar]]></surname>
<given-names><![CDATA[AK]]></given-names>
</name>
<name>
<surname><![CDATA[Adhikary]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Basnet]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Khadka]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pneumonia in patients with chronic kidney disease admitted to nephrology department of a tertiary care center: a descriptive cross-sectional study]]></article-title>
<source><![CDATA[JNMA J Nepal Med Assoc]]></source>
<year>2021</year>
<volume>59</volume>
<numero>242</numero>
<issue>242</issue>
<page-range>1000-3</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wong]]></surname>
<given-names><![CDATA[JL]]></given-names>
</name>
<name>
<surname><![CDATA[Evans]]></surname>
<given-names><![CDATA[SE]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Bacterial pneumonia in patients with cancer: novel risk factors and management]]></article-title>
<source><![CDATA[Clin Chest Med]]></source>
<year>2017</year>
<volume>38</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>263-77</page-range></nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baskaran]]></surname>
<given-names><![CDATA[V]]></given-names>
</name>
<name>
<surname><![CDATA[Murray]]></surname>
<given-names><![CDATA[RL]]></given-names>
</name>
<name>
<surname><![CDATA[Hunter]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Lim]]></surname>
<given-names><![CDATA[WS]]></given-names>
</name>
<name>
<surname><![CDATA[McKeever]]></surname>
<given-names><![CDATA[TM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of tobacco smoking on the risk of developing community acquired pneumonia: A systematic review and meta-analysis]]></article-title>
<source><![CDATA[PLoS One]]></source>
<year>2019</year>
<volume>14</volume>
<numero>7</numero>
<issue>7</issue>
</nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramirez]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Wiemken]]></surname>
<given-names><![CDATA[TL]]></given-names>
</name>
<name>
<surname><![CDATA[Peyrani]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Adults hospitalized with pneumonia in the united states: incidence, epidemiology, and mortality]]></article-title>
<source><![CDATA[Clin Infect Dis]]></source>
<year>2017</year>
<volume>65</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1806-12</page-range></nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ferrer]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Sequeira]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Cilloniz]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ventilator-associated pneumonia and PaO2/FIO2 diagnostic accuracy: changing the paradigm?]]></article-title>
<source><![CDATA[J Clin Med]]></source>
<year>2019</year>
<volume>8</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>1217</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
