<?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>S2448-89092022000400202</article-id>
<article-id pub-id-type="doi">10.35366/105790</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto del óxido nítrico inhalado en la mecánica ventilatoria y oxigenación de pacientes con hipoxemia grave refractaria a prono prolongado y bloqueo neuromuscular secundario a infección por SARS-CoV-2]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of inhaled nitric oxide on ventilatory mechanics and oxygenation of patients with severe hypoxemia refractory to prolonged prone and neuromuscular blockade secondary to SARS-CoV-2]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito do óxido nítrico inalado na mecânica ventilatória e oxigenação de pacientes com hipoxemia grave refratária a pronação prolongada e bloqueio neuromuscular secundário à infecção por SARS-CoV-2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro Serrano]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez Calzada]]></surname>
<given-names><![CDATA[Armando]]></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[Chaires Gutiérrez]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Sánchez]]></surname>
<given-names><![CDATA[Nancy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Médico ABC  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>36</volume>
<numero>4</numero>
<fpage>202</fpage>
<lpage>209</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-89092022000400202&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-89092022000400202&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-89092022000400202&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[resumen está disponible en el texto completo]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Introduction:  Among the patients infected with SARS-CoV-2, 14.6% were admitted to intensive care unit. this 29 to 75% required invasive mechanical ventilation with an associated mortality of 12 to 81%. Acute respiratory distress syndrome (ARDS) is the most serious form of presentation. The pathophysiology of ARDS secondary to SARS-CoV-2 differs from conventional causes. It presents dysregulation in hypoxic pulmonary vasoconstriction, secondary acute pulmonary hypertension and microthrombotic phenomena. The development of refractory severe hypoxemia (PaO2 &lt; 60 mmHg or PaO2/FiO2 &lt; 100 mmHg, with FiO2 80 to 100%, with PEEP &gt; 10 to 20 cmH2O for at least 10 to 12 hours) constitutes the scenario of maximum severity with an associated mortality of 71 to 94%. The use of rescue strategies that impact on the specific pathophysiology of this entity such as the use of inhaled nitric oxide, neuromuscular blockade and prone ventilation have emerged as therapeutic targets of interest. Protective mechanical ventilation (plateau pressure [Pplat] &lt; 27 cmH2O and driving pressure [DP] &lt; 15 cmH2O) continues to be the cornerstone of the management.  Objectives:  To determine whether there is an association between the use of inhaled nitric oxide and prone ventilation with ventilatory mechanics in patients with severe refractory hypoxemia secondary to SARS-CoV-2 infection.  Material and methods:  A historical, retrospective, descriptive, comparative and retrolective cohort study was carried out. Data from the records of patients admitted to the Respiratory ICU of the ABC Medical Center with a diagnosis of ARDS secondary to SARS-CoV-2 infection who required iNO and mechanical ventilation in prone from April 1 to December 31, 2020 were analyzed. A univariate analysis was performed, the statistical analysis was performed in SPSS v 21, measures of trend, dispersion were analyzed as well as the analysis of risk factors with Student&#8217;s t test and &#967;2.  Results:  A total of 108 patients were analyzed, of which 54 received iNO, neuromuscular blockade and prone and 54 only neuromuscular blockade and prone ventilation. 81.5% (n = 88) were men. The most common comorbidity was diabetes mellitus in 51.9% (n = 56). The increase in oxygenation (delta PaO2/FiO2) was with a median of 31.9 ± 15.2 mmHg in the iNO group and 52.9 ± 16.74 mmHg in the control group (p = 0.001). The postintervention Pplat in the iNO group was 26.3 ± 3 and 34.5 ± 1.9 cmH2O in the control group (p = 0.792). The preintervention DP in the iNO group was 17.2 ± 3.9 and 13.4 ± 2.8 cmH2O in control group vs 13.1 ± 1.29 and 12 ± 1.92 cmH2O after the intervention (p = 0.001).  Conclusions:  The use of iNO in patients with severe hypoxemia refractory to prone ventilation and neuromuscular blockade did not produce a statistically significant improvement in oxygenation, however it allowed to reprogram the ventilatory support to keep the patient in goals of alveolar protection.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo:  Introdução:  14.6% dos pacientes infectados com SARS-CoV-2 são internados em terapia intensiva. Destes, 29 a 75% necessitam de ventilação mecânica invasiva com mortalidade associada de 12 a 81%. A síndrome do desconforto respiratório agudo (SDRA) é a forma mais grave de apresentação. A fisiopatologia da SDRA secundária ao SARS-CoV-2 difere das causas convencionais. Apresenta desregulação na vasoconstrição pulmonar hipóxica, hipertensão pulmonar aguda secundária e fenômenos microtrombóticos. O desenvolvimento de hipoxemia grave refratária (PaO2 &lt; 60 mmHg ou PaO2/FiO2 &lt; 100 mmHg, com FiO2 de 80 a 100%, PEEP &gt; 10 a 20 cmH2O por pelo menos 10 a 12 horas) constitui o cenário mais grave com mortalidade associada de 71 a 94%. O uso de estratégias de resgate que impactam na fisiopatologia específica dessa entidade, como o uso de óxido nítrico inalatório (NOi), bloqueio neuromuscular e ventilação prona, surgiram como alvos terapêuticos de interesse. A ventilação mecânica protetora (Pressão de Platô [PPLAT] &lt; 27 cmH2O e Pressão de Condução [CP] &lt; 15 cmH2O) continua sendo a base de seu manejo.  Objetivo:  Determinar se existe associação entre o uso de óxido nítrico inalatório e ventilação prona prolongada com mecânica ventilatória em pacientes com hipoxemia refratária grave secundária à infecção por SARS-CoV-2.  Material e métodos:  Realizou-se um estudo de coorte histórico, retrospectivo, descritivo, comparativo e retroletivo. Analisaram-se dados dos prontuários de pacientes internados na UTI Respiratória do Centro Médico ABC com diagnóstico de SDRA secundária à infecção por SARS-CoV-2 que necessitaram de óxido nítrico inalatório e ventilação mecânica prona no período de 1o de abril a 31 de dezembro de 2020. Realizou-se uma análise univariada , a análise estatística foi realizada no SPSS v 21, foram analisadas as medidas de tendência e dispersão, assim como a análise dos fatores de risco com teste t de Student e &#967;2.  Resultados:  Analisaram-se 108 pacientes, dos quais 54 receberam NOi, bloqueio neuromuscular e prono e 54 apenas bloqueio neuromuscular e ventilação prona. 81.5% (n = 88) eram homens. A comorbidade mais comum foi diabetes mellitus em 51.9% (n = 56). O aumento da oxigenação (Delta PaO2/FiO2) foi com mediana de 31.9 ± 15.2 mmHg no grupo NOi e 52.9 ± 16.74 mmHg no grupo controle (p = 0.001). A PPLAT após a intervenção no grupo NOi foi de 26.3 ± 3 e 34.5 ± 1.9 cmH2O no grupo controle (p = 0.792). A PC antes da intervenção no grupo NOi foi de 17.2 ± 3.9 e 13.4 ± 2.8 cmH2O no grupo controle vs 13.1 ± 1.29 e 12 ± 1.92 cmH2O após a intervenção (p = 0.001).  Conclusões:  O uso de NOi em pacientes com hipoxemia grave refratária à ventilação em pronação e bloqueio neuromuscular não produziu melhora estatisticamente significativa na oxigenação, porém permitiu que o suporte ventilatório fosse reprogramado para manter as metas de proteção alveolar do paciente.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hipoxemia refractaria]]></kwd>
<kwd lng="es"><![CDATA[óxido nítrico inhalado]]></kwd>
<kwd lng="es"><![CDATA[bloqueo neuromuscular]]></kwd>
<kwd lng="es"><![CDATA[protección alveolar]]></kwd>
<kwd lng="es"><![CDATA[ventilación en prono]]></kwd>
<kwd lng="en"><![CDATA[Refractory hypoxemia]]></kwd>
<kwd lng="en"><![CDATA[inhaled nitric oxide]]></kwd>
<kwd lng="en"><![CDATA[neuromuscular blockade]]></kwd>
<kwd lng="en"><![CDATA[alveolar protection]]></kwd>
<kwd lng="en"><![CDATA[prone ventilation]]></kwd>
<kwd lng="pt"><![CDATA[Hipoxemia refratária]]></kwd>
<kwd lng="pt"><![CDATA[óxido nítrico inalado]]></kwd>
<kwd lng="pt"><![CDATA[bloqueio neuromuscular]]></kwd>
<kwd lng="pt"><![CDATA[proteção alveolar]]></kwd>
<kwd lng="pt"><![CDATA[ventilação prona]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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