<?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>S2448-89092018000100020</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Determinación del poder mecánico en pacientes en ventilación mecánica invasiva en modalidad espontánea]]></article-title>
<article-title xml:lang="en"><![CDATA[Determination of the mechanical power in patients in invasive mechanical ventilation in spontaneous mode]]></article-title>
<article-title xml:lang="pt"><![CDATA[Determinação da potência mecânica em pacientes com ventilação mecânica invasiva no modo espontâneo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Ramírez]]></surname>
<given-names><![CDATA[José Israel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monares Zepeda]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Carmona]]></surname>
<given-names><![CDATA[Brenda Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camarena Alejo]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre Sánchez]]></surname>
<given-names><![CDATA[Janet Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco Granillo]]></surname>
<given-names><![CDATA[Juvenal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Médico ABC  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2018</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>20</fpage>
<lpage>26</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-89092018000100020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-89092018000100020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-89092018000100020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Objetivo: Determinar cuál es el poder mecánico (mediante un modelo matemático que puede englobar las posibles causas de lesión pulmonar) otorgado por el ventilador en pacientes bajo ventilación mecánica invasiva en modalidad espontánea VAP (ventilación asisto-proporcional).  Material y métodos: Se calculó el poder mecánico y de distensión con las fórmulas:        p o d e r  m e c a n i c o  r s = F R .    &#8710;   V  2 .      1  2 .   E L  r s  +  F R .      1  +  I :  E  60  .  I  :  E  .    R  a w  + &#8710; V  .  P E E P 2. Poder mecánico rs = (0.098) · (FR . &#916;V) · (Ppico &#8722; ½ · &#916;P) 3. PD = (0.098) · (PPL &#8722; PEEP) · Vt · FR Se realizó en 60 pacientes, la mitad de ellos con ventilación mecánica invasiva en modalidad espontánea VAP, estimando la presión meseta (P  pl ) mediante el volumen corriente (Vt), la distensibilidad (C  rs ) y la presión positiva al final de la espiración total (PEEPt) dadas por el ventilador mecánico.  Resultados: Se incluyeron datos de 60 pacientes bajo ventilación mecánica invasiva, 30 de ellos en la modalidad espontánea: ventilación asisto-proporcional (VAP), de los cuales 100% tuvo retiro de la ventilación exitoso; 30 pacientes como controles emparejados en modalidades controladas, con edad de 65 (DE ± 15) años, 63% hombres y parámetros generales: frecuencia respiratoria (FR) media de 18 (DE ± 5.5) min-1, Vt medio de 0.46 (DE ± 0.1) Lts, Crs media de 55 (DE ± 22) mL/cm H2O, PEEPt de 7.6 (DE ± 3.3) cm H2O, presión pico (P  pico ) 20.4 (DE ± 6.9) cm H2O, Ppl de 17.05 (DE ± 5.8) cm H2O. Al calcular el poder mecánico, todas las comparaciones fueron menores en pacientes en modalidad espontánea versus aquellos ventilados con modalidad controlada; se determinaron los siguientes valores: 6.98 (DE ± 1.69) versus 18.49 (DE ± 8.20) J/min (p &lt; 0.001), 7.17 (DE ± 1.67) versus 20.92 (DE ± 9.05) J/min (p &lt; 0.001) y de 4.6 (DE ± 1.64) versus 12.33 (DE ± 7.04) J/min (p &lt; 0.001), en las fórmulas 1, 2 y 3 respectivamente, con un valor promedio para los pacientes en modalidad espontánea de 6.25 (DE ± 1.66) J/min.  Conclusiones: La posibilidad de determinar un valor promedio del poder mecánico en pacientes bajo ventilación mecánica invasiva en modalidad VAP puede permitir obtener un parámetro como objetivo a seguir bajo el contexto de su equivalencia estimada en condiciones fisiológicas y, sobre todo, en pacientes en quienes se desean conservar medidas de protección pulmonar y progresar para retirar la ventilación invasiva.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Objective: To define which would be the mechanical power (using a mathematical model that can apply to possible causes for lung injury) used by a ventilator, in patients undergoing invasive mechanical ventilation in spontaneous PAV (proportional assist ventilation).  Material and methods: The mechanical and distention powers are calculated using the equations:        p o d e r  m e c a n i c o  r s = F R .    &#8710;   V  2 .      1  2 .   E L  r s  +  F R .      1  +  I :  E  60  .  I  :  E  .    R  a w  + &#8710; V  .  P E E P 2. Mechanical power rs = (0.098) . (FR . &#916;V) . (Ppeak &#8722; ½ . &#916;P) 3. PD = (0.098) . (PPL &#8722; PEEP) . Vt . RF Sixty patients were selected, half of them with invasive mechanical ventilation PAV in spontaneous mode, estimating the plateau pressure (P  pl ) though tidal volume value (Vt), distensibility (C  rs ), and the positive pressure at the end of a normal exhalation (PEEPt) given by the mechanical ventilator.  Results:  Data from 60 patients undergoing invasive mechanical ventilation was included, 30 of them through spontaneous modality: proportional assist ventilation (PAV), from which 100% had a successful ventilator tube removal; 30 patients were paired as controls with controlled modalities, with age 65 years (SD ± 15), 63% were men, with the general parameters: mean respiratory frequency (RF) of 18 (SD ± 5.5) min-1, mean Vt of 0.46 (SD ± 0.1) Lts, mean C  rs of 55 (SD ± 22) mL/cm H2O, PEEPt of 7.6 (SD ± 3.3) cm H2O, peak pressure (Ppico) 20.4 (SD ± 6.9) cm H2O, Ppl of 17.05 (SD ± 5.8) cm H2O. When comparing the mechanical power, all the results were inferior in patients with spontaneous modality versus patients undergoing controlled modality ventilation, determining the following values: 6.98 (SD ± 1.69) versus 18.49 (SD ± 8.20) J/min (p &lt; 0.001), 7.17 (SD ± 1.67) versus 20.92 (SD ± 9.05) J/min (p &lt; 0.001) and of 4.6 (SD ± 1.64) versus 12.33 (SD ± 7.04) J/min (p &lt; 0.001), in the equations 1, 2, and 3 respectively, with an average value for the patients undergoing spontaneous modality of 6.25 (SD ± 1.66) J/min.  Conclusions:  The probability of determining a mean value for the mechanical power used in patients undergoing invasive mechanical ventilation on a PAV mode may allow to obtain a standard parameter to follow under the context of its estimated equivalence in physiological conditions, mainly for patients in whom lung protective measures are desired in order to obtain a positive progress and the eventual removal of the invasive ventilation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo:  Objectivo:  Determinar qual seria a potência mecânica (usando um modelo matemático que pode englobar às possíveis causas de lesão pulmonar) outorgada pelo ventilador, em pacientes submetidos a ventilação mecânica invasiva no modo espontâneo PAV (Ventilação assistida proporcional).  Métodos:  Calculamos a potência mecânica e de distensão com as fórmulas:        p o d e r  m e c a n i c o  r s = F R .    &#8710;   V  2 .      1  2 .   E L  r s  +  F R .      1  +  I :  E  60  .  I  :  E  .    R  a w  + &#8710; V  .  P E E P 2. Poder mecánico rs = (0.098) · (FR · &#916;V) · (Ppico &#8722; ½ · &#916;P) 3. PD = (0.098) · (PPL &#8722; PEEP) · Vt · FR Foram selecionados 60 pacientes, metade com ventilação mecânica invasiva PAV, estimando a pressão de platô (Ppl) mediante o volume corrente (Vt), distensibilidade (Crs), e a pressão positiva ao final de uma expiração total (PEEPt) dadas pelo ventilador mecânico.  Resultados:  Foram incluídos dados de 60 pacientes com ventilação mecânica invasiva, 30 no modo espontâneo: ventilação assistida proporcional a (PAV), dos quais 100% tinham remoção bem sucedida de ventilação, 30 pacientes com controles em modalidades controladas, com idade de 65 (SD ± 15) anos, 63% homens e parâmetros gerais: frequência respiratória (FR) média de 18 (SD ± 5.5) min-1, Vt médio 0.46 (SD ± 0.1) Lts, Crs média de 55 (SD ± 22) mL/cm H2O, PEEPt de 7.6 cm (SD ± 3.3) com H2O, pressão de pico (Ppico) 20.4 (SD ± 6.9) cm H2O, Ppl de 17.05 (SD ± 5.8) cm H2O. Todas as comparações ao calcular a potência mecânica, foram menores em pacientes no modo espontâneo vs os pacientes ventilados com modo controlado, determinando os seguintes valores: 6.98 (SD ± 1.69) vs 18.49 (SD ± 8.20) J/min (p &lt; 0.001), 7.17 (SD ± 1.67) vs 20.92 (SD ± 9.05) J/min (p &lt; 0.001) e 4.6 (SD ± 1.64) vs 12.33 (SD ± 7.04) J/min (p &lt; 0.001), nas fórmulas 1, 2 e 3, respectivamente, com um valor médio para os pacientes em modo espontâneo de 6.25 (SD ± 1.66) J/min.  Conclusões:  A possibilidade de determinar um valor médio da potência mecânica em pacientes sob ventilação mecânica invasiva no modo PAV, permitiu obter um parâmetro como objetivo a seguir; no contexto da sua equivalência estimada em condições fisiológicas e acima de tudo, os pacientes que desejamos preservar medidas de proteção pulmonar e progressar para remover a ventilação invasiva.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Poder mecánico]]></kwd>
<kwd lng="es"><![CDATA[ventilación asisto-proporcional (VAP)]]></kwd>
<kwd lng="es"><![CDATA[lesión pulmonar inducida por el ventilador (VILI)]]></kwd>
<kwd lng="en"><![CDATA[Mechanical power]]></kwd>
<kwd lng="en"><![CDATA[proportional assist ventilation (PAV)]]></kwd>
<kwd lng="en"><![CDATA[ventilator-induced lung injury (VILI)]]></kwd>
<kwd lng="pt"><![CDATA[Potência mecânica]]></kwd>
<kwd lng="pt"><![CDATA[ventilação assistida proporcional (PAV)]]></kwd>
<kwd lng="pt"><![CDATA[lesão pulmonar induzida pelo ventilador (LPIV)]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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