<?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>2448-8909</journal-id>
<journal-title><![CDATA[Medicina crítica (Colegio Mexicano de Medicina Crítica)]]></journal-title>
<abbrev-journal-title><![CDATA[Med. crít. (Col. Mex. Med. Crít.)]]></abbrev-journal-title>
<issn>2448-8909</issn>
<publisher>
<publisher-name><![CDATA[Colegio Mexicano de Medicina Crítica A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-89092023000100021</article-id>
<article-id pub-id-type="doi">10.35366/109958</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Índice de PaO2/FAO2: ¿un mejor indicador de oxigenación para valorar la hipoxemia? Resultados de un análisis de concordancia con el índice de PaO2/FiO2]]></article-title>
<article-title xml:lang="en"><![CDATA[PaO2/FAO2 index: a better oxygenation indicator to assess hypoxemia? Results of an analysis of agreement with the PaO2/FiO2 index]]></article-title>
<article-title xml:lang="pt"><![CDATA[Índice PaO2/FAO2: melhor indicador de oxigenação para avaliar hipoxemia? Resultados de uma análise de concordância com o índice de PaO2/FiO2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas Corona]]></surname>
<given-names><![CDATA[Lizeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vidal Andrade]]></surname>
<given-names><![CDATA[Erick]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerón Díaz]]></surname>
<given-names><![CDATA[Ulises W]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Español  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>37</volume>
<numero>1</numero>
<fpage>21</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-89092023000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-89092023000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-89092023000100021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  el cociente PaO2/FiO2 ajustado a la presión barométrica se utiliza para evaluar la oxigenación en la falla respiratoria; sin embargo, no toma en cuenta la PaCO2, a diferencia del índice PaO2/FAO2 (PaO2 dividida entre la fracción alveolar de oxígeno).  Objetivo:  evaluar la concordancia entre PaO2/FiO2 y PaO2/FAO2.  Material y métodos:  estudio observacional, ambispectivo, transversal y analítico en pacientes mayores de 18 años, bajo ventilación mecánica invasiva, con falla respiratoria hipoxémica y con diferentes valores de PaCO2.  Resultados:  se analizó la concordancia en 64 mediciones gasométricas tomadas al ingreso y cuando se documentó la mayor PaCO2 de 32 enfermos. El análisis de Bland y Altman mostró una media de las diferencias (bias) de 13 y un límite de concordancia de 95%, entre 54 y -24. La concordancia es mejor cuando la PaO2/FiO2 es menor de 150. Veintidós por ciento de las mediciones no concordaron en la asignación a grupos con hipoxemia leve, moderada o grave.  Conclusiones:  existe una moderada concordancia entre la PaO2/FAO2 y la PaO2/FiO2; sin embargo, en los enfermos con hipoxemia severa la concordancia es mejor. En los pacientes con PaO2/FiO2 &#8805; 150, la hipercapnia explica en parte la baja concordancia. Posiblemente la PaO2/FAO2 es una mejor forma de evaluar el grado del trastorno en la oxigenación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  the PaO2/FiO2 ratio adjusted to barometric pressure is used to assess oxygenation in respiratory failure; however, it does not take PaCO2 into account, unlike the PaO2/FAO2 ratio (PaO2 divided by the alveolar fraction of oxygen).  Objective:  to evaluate the agreement between PaO2/FiO2 and PaO2/FAO2.  Material and methods:  observational, ambispective, cross-sectional and analytical study in patients older than 18 years, under invasive mechanical ventilation with respiratory failure and with different PaCO2 values.  Results:  agreement was analyzed in 64 gasometric measurements taken at admission and when the highest PaCO2 was documented, of 32 patients. The Bland and Altman analysis showed a mean of the differences (bias) of 13 and a 95% limit of agreement, between 54 and -24. Agreement is better when PaO2/FiO2 is greater than 150. Twenty two percent of the measurements did not agree in the assignment to groups with mild, moderate, or severe hypoxemia.  Conclusions:  there is moderate agreement between PaO2/FAO2 and PaO2/FiO2; however, in patients with severe hypoxemia, agreement is better. In patients with PaO2/FiO2 &#8805; 150, hypercapnia partly explains the low agreement. PaO2/FAO2 is possibly a better way to assess the degree of oxygenation disturbance.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo:  Introdução:  o cociente PaO2/FiO2 ajustado à pressão barométrica é utilizada para avaliar a oxigenação na insuficiência respiratória; entretanto, não considera a PaCO2, ao contrário da relação PaO2/FAO2 (PaO2 dividida pela fração alveolar de oxigênio).  Objetivo:  Avaliar a concordância entre PaO2/FiO2 e PaO2/FAO2.  Material e métodos:  estudo observacional, ambispectivo, transversal e analítico em pacientes maiores de 18 anos, sob ventilação mecânica invasiva com insuficiência respiratória hipoxêmica e com diferentes valores de PaCO2.  Resultados:  analisou-se a concordância em 64 gasometrias feitas na admissão e quando documentou-se a maior PaCO2, de 32 pacientes. A análise de Bland e Altman mostrou uma média das diferenças (bias) de 13 e limite de concordância de 95%, entre 54 e -24. A concordância é melhor quando a PaO2/FiO2 é maior que 150. 22% das medidas não concordaram na alocação dos grupos com hipoxemia leve, moderada ou grave.  Conclusões:  existe uma concordância moderada entre PaO2/FAO2 e a PaO2/FiO2; no entanto, em pacientes com hipoxemia grave a concordância é melhor. Em pacientes com PaO2/FiO2 &#8805; 150, a hipercapnia explica em parte a baixa concordância. Possivelmente a PaO2/FAO2 seja a melhor forma de avaliar o grau de distúrbio da oxigenação.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[índice de Kirby]]></kwd>
<kwd lng="es"><![CDATA[índice PaO2/FAO2]]></kwd>
<kwd lng="es"><![CDATA[índice PaO2/FiO2]]></kwd>
<kwd lng="en"><![CDATA[Kirby index]]></kwd>
<kwd lng="en"><![CDATA[PaO2/FAO2 index]]></kwd>
<kwd lng="en"><![CDATA[PaO2/FiO2 index]]></kwd>
<kwd lng="pt"><![CDATA[índice de Kirby]]></kwd>
<kwd lng="pt"><![CDATA[índice PaO2/FAO2]]></kwd>
<kwd lng="pt"><![CDATA[índice PaO2/FiO2]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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