<?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>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112017000600005</article-id>
<article-id pub-id-type="doi">10.20960/nh.1238</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nuestros grandes olvidados, los enfermos respiratorios crónicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Our great forgotten, chronic respiratory sufferers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bordejé Laguna]]></surname>
<given-names><![CDATA[M.ª Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Germans Trias i Pujol Servicio de Medicina Intensiva ]]></institution>
<addr-line><![CDATA[Badalona ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>34</volume>
<fpage>38</fpage>
<lpage>45</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112017000600005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112017000600005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112017000600005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las peculiaridades del pulmón hacen que el soporte nutricional, además de cubrir los requerimientos, pueda modular su respuesta inflamatoria. El pulmón tiene mínima capacidad de almacenar glucosa. Los lípidos son el sustrato energético de elección de los neumocitos tipo II que los utilizan para formar fosfolípidos, componentes esenciales del surfactante. Su síntesis y liberación disminuyen en la lesión pulmonar aguda (LPA). La glutamina es un buen sustrato para las células endoteliales y los neumocitos tipo II. La valoración nutricional de los pacientes con EPOC y SDRA es fundamental dado su alto riesgo nutricional. La calorimetría indirecta evalúa la respuesta del soporte nutricional y ventilatorio, evitando la sobrenutrición. La hipofosfatemia del síndrome de realimentación es frecuente y debe evitarse por la morbilidad que conlleva. En críticos, la desnutrición puede mantener la insuficiencia respiratoria y prolongar el tiempo de ventilación mecánica (VM). En fase de weaning se deberían controlar los aportes de glucosa para evitar la retención de CO2. Fórmulas con un alto cociente grasas/hidratos de carbono no han demostrado una clara utilidad en el paciente EPOC ni en la retirada de la VM. Los pacientes con LPA se benefician del soporte nutricional precoz y del control del aporte de volumen. Las dietas enterales con alto contenido en grasas (EPA, DHA y &#947;-linolénico) y antioxidantes no han demostrado superioridad. En nutrición parenteral, las emulsiones con mayor contenido de ácidos grasos omega-3 parecen modular positivamente la inflamación y la inmunosupresión. La utilización de glutamina, vitaminas o antioxidantes en estos pacientes podría estar justificada.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Lung's own properties make that nutritional support, besides covering the requirements can modulate its inflammatory response. Lung tissue has a low glucose stock. Fatty acids are the main energy producer of type II pneumocytes, which use them in order to form phospholipids, essential for surfactant whose creation and release decrease in acute lung injury (ALI). Glutamine is a good substratum for endocrine cells and type II pneumocytes. Due to high nutritional risk, it is important its assessments in disorders as COPD and acute respiratory distress syndrome (ADRS). Indirect calorimetry values the effect of ventilation and nutritional support, avoiding overfeeding. Hypophosphatemia and refeeding syndrome are frequent and need to be avoided because of their morbidity. In critically ill patients, malnutrition can lead to respiratory failure and increasing mechanical ventilation time. To avoid hypercapnia in weaning, glucose levels should be controlled. High lipids/carbohydrates ratio do not show usefulness in COPD neither mechanical ventilation removal. ALI patients beneficiate from an early start and the volume administered. Enteral nutrition with high fatty acids ratio (EPA, DHA and &#947;-linolenic acid) and antioxidants do not show any superiority. Omega-3 fatty acid in parenteral nutrition could modulate inflammation and immunosuppression in a positive manner. The use of glutamine, vitamins or antioxidants in these patients could be justified.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[EPOC]]></kwd>
<kwd lng="es"><![CDATA[LPA]]></kwd>
<kwd lng="es"><![CDATA[SDRA]]></kwd>
<kwd lng="es"><![CDATA[VCO2]]></kwd>
<kwd lng="es"><![CDATA[Hipermetabolismo]]></kwd>
<kwd lng="es"><![CDATA[Desnutrición]]></kwd>
<kwd lng="en"><![CDATA[COPD]]></kwd>
<kwd lng="en"><![CDATA[ALI]]></kwd>
<kwd lng="en"><![CDATA[ARDS]]></kwd>
<kwd lng="en"><![CDATA[VCO2]]></kwd>
<kwd lng="en"><![CDATA[Hypermetabolism]]></kwd>
<kwd lng="en"><![CDATA[Malnutrition]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 

    <p><font face="Verdana" size="2"><a name="top"></a><b>ARTÍCULOS</b></font></p>
    <p>&nbsp;</p>

<font face="Verdana" size="4">

    <p><b>Nuestros grandes olvidados, los enfermos respiratorios cr&oacute;nicos</b></p>
    <p><b>Our great forgotten, chronic respiratory sufferers</b></p>
</font>
    <p>&nbsp;</p>
    <p>&nbsp;</p>

<font face="Verdana" size="2">
    <p><b>M.ª Luisa Bordej&eacute; Laguna</b></p>
    <p>Servicio de Medicina Intensiva. Hospital Germans Trias i Pujol. Badalona, Barcelona</p>

    <p><a href="#bajo">Direcci&oacute;n para correspondencia</a></p>
</font>

    ]]></body>
<body><![CDATA[<p>&nbsp;</p>
    <p>&nbsp;</p>
<hr size="1">

<font face="Verdana" size="2">
    <p><b>RESUMEN</b></p>
    <p>Las peculiaridades del pulm&oacute;n hacen que el soporte nutricional, adem&aacute;s de cubrir los requerimientos, pueda modular su respuesta inflamatoria. El pulm&oacute;n tiene m&iacute;nima capacidad de almacenar glucosa. Los l&iacute;pidos son el sustrato energ&eacute;tico de elecci&oacute;n de los neumocitos tipo II que los utilizan para formar fosfol&iacute;pidos, componentes esenciales del surfactante. Su s&iacute;ntesis y liberaci&oacute;n disminuyen en la lesi&oacute;n pulmonar aguda (LPA). La glutamina es un buen sustrato para las c&eacute;lulas endoteliales y los neumocitos tipo II.    <br>
La valoraci&oacute;n nutricional de los pacientes con EPOC y SDRA es fundamental dado su alto riesgo nutricional. La calorimetr&iacute;a indirecta eval&uacute;a la respuesta del soporte nutricional y ventilatorio, evitando la sobrenutrici&oacute;n. La hipofosfatemia del s&iacute;ndrome de realimentaci&oacute;n es frecuente y debe evitarse por la morbilidad que conlleva.    <br>
En cr&iacute;ticos, la desnutrici&oacute;n puede mantener la insuficiencia respiratoria y prolongar el tiempo de ventilaci&oacute;n mec&aacute;nica (VM). En fase de weaning se deber&iacute;an controlar los aportes de glucosa para evitar la retenci&oacute;n de CO<sub>2</sub>.    <br>
F&oacute;rmulas con un alto cociente grasas/hidratos de carbono no han demostrado una clara utilidad en el paciente EPOC ni en la retirada de la VM. Los pacientes con LPA se benefician del soporte nutricional precoz y del control del aporte de volumen. Las dietas enterales con alto contenido en grasas (EPA, DHA y &gamma;-linol&eacute;nico) y antioxidantes no han demostrado superioridad. En nutrici&oacute;n parenteral, las emulsiones con mayor contenido de &aacute;cidos grasos omega-3 parecen modular positivamente la inflamaci&oacute;n y la inmunosupresi&oacute;n. La utilizaci&oacute;n de glutamina, vitaminas o antioxidantes en estos pacientes podr&iacute;a estar justificada.</p>
    <p><b>Palabras clave:</b> EPOC. LPA. SDRA. VCO<sub>2</sub>. Hipermetabolismo. Desnutrici&oacute;n.</p>
<hr size="1">

    <p><b>ABSTRACT</b></p>
    <p>Lung's own properties make that nutritional support, besides covering the requirements can modulate its inflammatory response.    ]]></body>
<body><![CDATA[<br>
Lung tissue has a low glucose stock. Fatty acids are the main energy producer of type II pneumocytes, which use them in order to form phospholipids, essential for surfactant whose creation and release decrease in acute lung injury (ALI). Glutamine is a good substratum for endocrine cells and type II pneumocytes.    <br>
Due to high nutritional risk, it is important its assessments in disorders as COPD and acute respiratory distress syndrome (ADRS). Indirect calorimetry values the effect of ventilation and nutritional support, avoiding overfeeding. Hypophosphatemia and refeeding syndrome are frequent and need to be avoided because of their morbidity.    <br>
In critically ill patients, malnutrition can lead to respiratory failure and increasing mechanical ventilation time. To avoid hypercapnia in weaning, glucose levels should be controlled.    <br>
High lipids/carbohydrates ratio do not show usefulness in COPD neither mechanical ventilation removal. ALI patients beneficiate from an early start and the volume administered. Enteral nutrition with high fatty acids ratio (EPA, DHA and &gamma;-linolenic acid) and antioxidants do not show any superiority. Omega-3 fatty acid in parenteral nutrition could modulate inflammation and immunosuppression in a positive manner. The use of glutamine, vitamins or antioxidants in these patients could be justified.</p>
    <p><b>Key words:</b> COPD. ALI. ARDS. VCO<sub>2</sub>. Hypermetabolism. Malnutrition.</p>
<hr size="1">
    <p>&nbsp;</p>

    <p><b>INTRODUCCI&Oacute;N</b></p>
    <p>En los &uacute;ltimos a&ntilde;os se ha despertado un gran inter&eacute;s en la relaci&oacute;n entre nutrici&oacute;n y pulm&oacute;n, tanto en el paciente con enfermedad pulmonar obstructiva cr&oacute;nica (EPOC) en ventilaci&oacute;n espont&aacute;nea, como en el paciente en fase de insuficiencia respiratoria aguda (IRA) con ingreso en unidades de cr&iacute;ticos, con especial referencia al s&iacute;ndrome de distr&eacute;s respiratorio del adulto (SDRA).</p>
    <p>La EPOC forma parte de las patolog&iacute;as m&aacute;s frecuentes del paciente cr&oacute;nico complejo. Se caracteriza por la obstrucci&oacute;n del flujo a&eacute;reo, por estrechamiento de las v&iacute;as respiratorias en la bronquitis cr&oacute;nica o por p&eacute;rdida del tejido el&aacute;stico pulmonar y destrucci&oacute;n de las paredes alveolares en el enfisema. En ambos casos, la entrada de aire a los pulmones estar&aacute; comprometida con atrapamiento del aire no expulsado. Esta situaci&oacute;n provoca cambios en la din&aacute;mica respiratoria caracterizados por sobreesfuerzo muscular y cambios anat&oacute;micos como el aplanamiento del diafragma y ensanchamiento de la caja tor&aacute;cica. Se asocia a una respuesta inflamatoria anormal de los pulmones ante gases o part&iacute;culas nocivas, fundamentalmente el humo del tabaco. Es de car&aacute;cter progresivo y con pocas posibilidades de reversibilidad. Adem&aacute;s, no solo se manifiesta por alteraciones pulmonares, sino que puede afectar a otros &oacute;rganos y sistemas por reacci&oacute;n inflamatoria (1-4).</p>
    <p>La situaci&oacute;n nutricional del paciente EPOC es uno de los factores determinantes en el fracaso respiratorio. El bajo peso y la p&eacute;rdida importante de masa magra se asocian a un peor pron&oacute;stico (4,5). Existe poca evidencia acerca del estado nutricional y las anormalidades metab&oacute;licas del resto de neumopat&iacute;as cr&oacute;nicas.</p>
    ]]></body>
<body><![CDATA[<p>El SDRA es originado por la respuesta inflamatoria secundaria a un insulto pulmonar o extrapulmonar que se caracteriza por la aparici&oacute;n de edema pulmonar de origen no cardiog&eacute;nico que condiciona la alteraci&oacute;n en el intercambio gaseoso, caracterizado por la hipoxia refractaria (6). Cursa con hipercatabolismo intenso, donde las prote&iacute;nas se degradan para ser utilizadas como sustrato energ&eacute;tico y el enfermo presenta una p&eacute;rdida de masa muscular con miopat&iacute;a secundaria que hace que el destete de la VM sea complejo.</p>
    <p>En las unidades de cr&iacute;ticos nos podemos encontrar con las dos patolog&iacute;as respiratorias que pueden confluir en un mismo punto, se convierten en pacientes cr&iacute;ticos cr&oacute;nicos. Dicha entidad representa entre un 6-10% de los ingresos en unidades de cr&iacute;ticos, con un gran consumo de recursos. Estos enfermos se caracterizan por un estado de inflamaci&oacute;n e inmunosupresi&oacute;n persistente, mayor p&eacute;rdida de masa muscular y lenta desconexi&oacute;n del respirador que alarga el tiempo de ingreso en UCI. Estos enfermos dif&iacute;cilmente pueden regresar a su domicilio y se asocian con un alto riesgo de discapacidad, sufrimiento y muerte (7).</p>
    <p>El soporte nutricional seg&uacute;n el tipo de patolog&iacute;a respiratoria junto un buen programa de rehabilitaci&oacute;n tienen un papel preponderante en los pacientes con insuficiencia respiratoria, ya que pueden mejorar los resultados cl&iacute;nicos, disminuyendo los d&iacute;as de VM, la duraci&oacute;n de la estancia hospitalaria y la mortalidad (1,4).</p>
    <p>&nbsp;</p>

    <p><b>METABOLISMO PULMONAR</b></p>
    <p>El pulm&oacute;n presenta algunas peculiaridades metab&oacute;licas (8-10):</p>
    <p>- Su VO<sub>2</sub> es bajo en situaci&oacute;n de normalidad y similar al del intestino y al del m&uacute;sculo esquel&eacute;tico en reposo. En la lesi&oacute;n pulmonar aguda (LPA) y/o el SDRA, el empleo de energ&iacute;a puede suponer el 15-20% del VO2 total, con disminuci&oacute;n de la s&iacute;ntesis y liberaci&oacute;n del surfactante, por efecto del factor de necrosis tumoral (TNF).</p>
    <p>- Los &aacute;cidos grasos (AG) constituyen su sustrato energ&eacute;tico fundamental y las velocidades pulmonares de captaci&oacute;n y oxidaci&oacute;n de AG son elevadas en comparaci&oacute;n con las de otros tejidos. Los neumocitos tipo II los utilizan para formar fosfol&iacute;pidos, componente esencial del surfactante.</p>
    <p>- No tiene capacidad de almacenar glucosa como gluc&oacute;geno o l&iacute;pidos, pareci&eacute;ndose en esto al m&uacute;sculo esquel&eacute;tico. En el pulm&oacute;n el 75% de la glucosa es convertida en lactato y un 10% interviene en la s&iacute;ntesis de amino&aacute;cidos. Otra peque&ntilde;a parte se incorpora a los l&iacute;pidos, formando parte del &alpha;-glicerofosfato de los fosfol&iacute;pidos que componen el surfactante.</p>
    <p>- La glutamina es un buen sustrato energ&eacute;tico para las c&eacute;lulas endoteliales y los neumocitos tipo II. Cuando el endotelio pulmonar se lesiona, por la acci&oacute;n de las endotoxinas, el TNF o las interleuquinas muestra un alto consumo de glutamina. La s&iacute;ntesis pulmonar de glutamina aumenta y la glutamina sintetasa en las c&eacute;lulas endoteliales alcanza concentraciones m&aacute;s altas que el m&uacute;sculo esquel&eacute;tico.</p>
    ]]></body>
<body><![CDATA[<p>- Los neumocitos tipo II, que sintetizan el surfactante, muestran una actividad muy alta del ciclo de las pentosas, mientras que los neumocitos tipo I y las c&eacute;lulas endoteliales presentan escaso consumo de glucosa por esta v&iacute;a metab&oacute;lica. Ello explica la resistencia de los neumocitos tipo II en la agresi&oacute;n y en el estr&eacute;s oxidativo.</p>
    <p>- Las c&eacute;lulas endoteliales desempe&ntilde;an un importante papel en el metabolismo de la arginina, generando &oacute;xido n&iacute;trico. En la sepsis la producci&oacute;n de &oacute;xido n&iacute;trico se incrementa, con independencia de los niveles de arginina.</p>
    <p>&nbsp;</p>

    <p><b>MANEJO NUTRICIONAL</b></p>
    <p>La valoraci&oacute;n nutricional en pacientes con lesi&oacute;n pulmonar (EPOC/LPA) es necesaria para identificar a aquellos que tienen mayor riesgo de descompensaci&oacute;n. Los antecedentes nutricionales que identifiquen la evoluci&oacute;n del peso, la ingesta de nutrientes y la situaci&oacute;n cl&iacute;nica son &uacute;tiles para desarrollar los objetivos del soporte nutricional. Para su an&aacute;lisis sirven los mismos par&aacute;metros que se utilizan en el resto de enfermedades (IMC, bioimpedancia, marcadores bioqu&iacute;micos, VSG).</p>
    <p> En el c&aacute;lculo de requerimientos cal&oacute;ricos es de elecci&oacute;n la calorimetr&iacute;a indirecta, dado que eval&uacute;a la respuesta del soporte nutricional y ventilatorio, evitando la sobrenutrici&oacute;n. Pero su uso es limitado, sobre todo si se aplican altas dosis de ox&iacute;geno. En su defecto utilizaremos ecuaciones predictivas (11,12).</p>
    <p>&nbsp;</p>

    <p><b>ESTADO NUTRICIONAL EN LA EPOC</b></p>
    <p>La desnutrici&oacute;n es un problema com&uacute;n en las personas con EPOC con tasas de prevalencia que var&iacute;an del 20% en pacientes estables a 35% en pacientes con enfermedad avanzada (13). En el paciente enfisematoso existe un deterioro progresivo del &iacute;ndice de masa corporal (IMC), llegando a desnutrici&oacute;n cal&oacute;rica grave, mientras que el paciente con bronquitis cr&oacute;nica suele acompa&ntilde;arse de obesidad (14,15). Pero en ambos casos existe una frecuente disfunci&oacute;n de la musculatura y cambios estructurales de la misma debidos a inflamaci&oacute;n, estr&eacute;s oxidativo, el tratamiento corticoideo y la situaci&oacute;n nutricional, fen&oacute;meno que puede aparecer en fases precoces de la enfermedad (16-18).</p>
    <p>La p&eacute;rdida de masa libre de grasa (MLG), como medida indirecta de la masa muscular, afecta a la funci&oacute;n muscular respiratoria (sobre todo al diafragma) y perif&eacute;rica, a la capacidad de ejercicio, al curso cl&iacute;nico e incluso a la mortalidad (19). La presencia de atrofia muscular evaluada a trav&eacute;s de MLG (&lt; 16 y &lt; 15 kg/m<sup>2</sup>en hombres y mujeres respectivamente) y el bajo peso evaluado por el IMC (IMC &lt; 20 kg/m<sup>2</sup>o p&eacute;rdida de peso en EPOC con IMC &lt; 25 kg/m<sup>2</sup>) son factores predictores de mortalidad y morbilidad (mayor n&uacute;mero de reingresos y reagudizaciones m&aacute;s severas) (2). Las comorbilidades del paciente EPOC, especialmente la obesidad pueden condicionar la situaci&oacute;n nutricional y requerir&aacute;n una atenci&oacute;n nutricional espec&iacute;fica.</p>
    ]]></body>
<body><![CDATA[<p>La desnutrici&oacute;n tambi&eacute;n tiene efectos sobre el par&eacute;nquima pulmonar, ya que produce alteraci&oacute;n del surfactante pulmonar que recubre las paredes alveolares e incrementa el agua pulmonar total, produciendo un descenso en la capacidad de difusi&oacute;n del mon&oacute;xido de carbono a trav&eacute;s de la membrana alveolo-capilar (8).</p>
    <p>Tambi&eacute;n aparecen alteraciones sist&eacute;micas condicionadas por la enfermedad, que, junto a las comorbilidades habituales de estos pacientes (osteoporosis, diabetes, s&iacute;ndrome metab&oacute;lico y enfermedad cardiovascular), propician una mala evoluci&oacute;n de la situaci&oacute;n nutricional (18) (<a href="#t1">Tabla I</a>).</p>
    <p align="center"><a name="t1"></a><img src="/img/revistas/nh/v34s1/05_bordeje_tabla1.jpg" alt="tabla1"></p>
    <p>&nbsp;</p>

    <p><b>SOPORTE NUTRICIONAL EN EL PACIENTE EPOC (<a href="#f1">Fig. 1</a>)</b></p>
    <p>El soporte nutricional debe ser capaz de mejorar la utilizaci&oacute;n de ox&iacute;geno y la respuesta hemodin&aacute;mica, disminuir el consumo de ox&iacute;geno y optimizar el intercambio gaseoso. En enfermos estables debe realizarse una dieta variada, sana y equilibrada al igual que en las personas sanas. Solo con car&aacute;cter excepcional puede ser necesario manipular la cantidad, la calidad o la proporci&oacute;n de los nutrientes. Disminuir el aporte de nutrientes como medida terap&eacute;utica para disminuir el trabajo respiratorio puede resultar una alternativa peligrosa que conduzca a la desnutrici&oacute;n (20).</p>
    <p>En nutrici&oacute;n artificial, el aporte cal&oacute;rico no debe superar el gasto energ&eacute;tico basal (GEB) multiplicado por 1,2. Se desconoce cu&aacute;l es la cantidad de l&iacute;pidos m&aacute;s adecuada, as&iacute; que se propone que la proporci&oacute;n de l&iacute;pidos respecto a las calor&iacute;as no proteicas ha de ser al menos del 35% pero no m&aacute;s del 65% (21-23). Se han desarrollado productos de nutrici&oacute;n enteral con alto contenido en grasas y bajo contenido en hidratos de carbono (50-55% grasas, alrededor del 30% hidratos de carbono y el resto prote&iacute;nas), por las ventajas te&oacute;ricas de un menor VCO<sub>2</sub> debido a la oxidaci&oacute;n grasa (<a href="#t2">Tabla II</a>). Estas dietas no han conseguido demostrar un claro beneficio en el paciente EPOC en VM, excepto cuando se comparan con pacientes sobrenutridos (24,25).</p>
    <p align="center"><a name="t2"></a><img src="/img/revistas/nh/v34s1/05_bordeje_tabla2.jpg" alt="tabla2"></p>
    <p>&nbsp;</p>

    <p>La enfermedad respiratoria no modifica los requerimientos de nitr&oacute;geno que van a depender sobre todo del nivel de estr&eacute;s. Aportes de 1-1,5 g/kg/d&iacute;a de prote&iacute;nas son suficientes en pacientes no hipercatab&oacute;licos, mientras que aquellos que sufren una intensa agresi&oacute;n necesitar&aacute;n 1,5-2 g/kg/d&iacute;a. El exceso en el aporte proteico puede originar un est&iacute;mulo ventilatorio excesivo que incremente la fatiga muscular (24).</p>
    ]]></body>
<body><![CDATA[<p>La glutamina sigue siendo objeto de numerosos estudios, dada su importancia como transportadora de nitr&oacute;geno y precursora de amino&aacute;cidos, prote&iacute;nas y nucle&oacute;tidos. En condiciones normales, el m&uacute;sculo y el pulm&oacute;n son los principales donantes de glutamina del organismo. En situaciones como en la sepsis, el pulm&oacute;n pasa a consumir gran cantidad de ella. Pero hasta el momento no hay evidencia para recomendar el uso de glutamina de forma rutinaria (26).</p>
    <p>En cuanto a los micronutrientes, los aportes de magnesio, fosfato, calcio y potasio son importantes para restablecer la funcionalidad de la musculatura respiratoria. El fosfato es esencial para la s&iacute;ntesis de ATP y 2,3-difosfoglicerato, imprescindibles en la funci&oacute;n pulmonar. El riesgo de realimentaci&oacute;n es frecuente en estos pacientes que se encuentran en estado carencial por lo que se debe sospechar y tratar (27,28).</p>
    <p>En fases de reagudizaci&oacute;n se produce una alteraci&oacute;n en la fosforilaci&oacute;n oxidativa, donde determinadas vitaminas desempe&ntilde;an un papel importante por su acci&oacute;n antioxidante (29). Las vitaminas antioxidantes A, C y E parecen tener un efecto favorable sobre la respuesta inmunitaria, y la E, adem&aacute;s, sobre la inflamaci&oacute;n cr&oacute;nica. La vitamina D reduce las exacerbaciones si hay d&eacute;ficit previo (los niveles de vitamina D se deben corregir teniendo en cuenta los niveles de alb&uacute;mina) (30-32). El selenio es un cofactor esencial como antioxidante de la glutati&oacute;n peroxidasa, que contrarresta la posibilidad de lesi&oacute;n pulmonar sobre todo en pacientes fumadores (33). </p>
    <p>&nbsp;</p>

    <p><b>SOPORTE NUTRICIONAL EN EL PACIENTE CON LPA Y SDRA (<a href="#f1">Fig. 1</a>)</b></p>
    <p align="center"><a name="f1"></a><img src="/img/revistas/nh/v34s1/05_bordeje_fig1.jpg" alt="fig1"></p>
    <p>&nbsp;</p>

    <p>En el paciente con insuficiencia respiratoria aguda (LPA/SDRA) en situaci&oacute;n de hipercatabolismo, la enfermedad de base (s&eacute;ptico, politraumatismo, posquir&uacute;rgico) es la que determina el c&aacute;lculo de requerimientos. Estos procesos cursan con aumento del catabolismo proteico, de las necesidades energ&eacute;ticas y con resistencia a la insulina. Uno de los objetivos del soporte nutricional debe ser garantizar al menos entre el 50-65% del gasto energ&eacute;tico en reposo. Adem&aacute;s, no se debe olvidar la importancia de la restricci&oacute;n de l&iacute;quidos (utilizar f&oacute;rmulas concentradas) para evitar el edema pulmonar y perif&eacute;rico. Por todo ello, el soporte nutricional resulta complejo y debe ser din&aacute;mico, individualizado y ajustado a cada fase de la evoluci&oacute;n del paciente (34).</p>
    <p>Diferentes estudios han demostrado el beneficio de iniciar un soporte nutricional precoz (35-37) en los pacientes cr&iacute;ticos, pero sin olvidar que un aporte excesivo de energ&iacute;a provoca lipog&eacute;nesis con incremento de la producci&oacute;n de CO<sub>2</sub>. En el paciente con VM este hecho no supone un gran problema, pero en el paciente con ventilaci&oacute;n protectora o en fase de retirada de la VM, este incremento de las necesidades ventilatorias puede hacerlo fracasar.</p>
    <p>La estrategia nutricional para alcanzar los requerimientos cal&oacute;rico-proteicos, depender&aacute; del riesgo nutricional del paciente. Existe controversia al respecto, as&iacute; en pacientes con SDRA y/o necesidades de ventilaci&oacute;n mec&aacute;nica &gt; 72 h, con un riesgo nutricional moderado o bajo, las estrategias de un aporte nutricional completo inicial mediante NE o el uso de NE tr&oacute;fica (con un volumen inicial bajo e hipocal&oacute;rica) se han mostrado igualmente apropiadas, aunque el uso de NE tr&oacute;fica se ha asociado a menores complicaciones gastrointestinales. Sin embargo, en pacientes con necesidad de VM prolongada (&gt; 8 d&iacute;as) con un riesgo nutricional elevado, recibir unos requerimientos cal&oacute;ricos medios (&gt; 80%) en los primeros 8 d&iacute;as de ventilaci&oacute;n mec&aacute;nica y estancia en UCI, ya sea mediante NE y/o nutrici&oacute;n parenteral (NP) total o complementaria, parece ser m&aacute;s apropiado debido a que se ha asociado a una mayor supervivencia a los 6 meses y mejor recuperaci&oacute;n f&iacute;sica a los 3 meses de alta de UCI (38). Hay que ser prudentes a la hora de disminuir los aportes cal&oacute;ricos en el paciente cr&iacute;tico en insuficiencia respiratoria, porque estudios posteriores vuelven a demostrar que los pacientes con menor d&eacute;ficit cal&oacute;rico-proteico en la primera semana de ingreso no solo obtienen mejores resultados cl&iacute;nicos, sino que el destino al alta es a domicilio en vez de a un centro de rehabilitaci&oacute;n (36). En el momento actual, parece que en la primera semana de ingreso en cr&iacute;ticos debemos disminuir el aporte cal&oacute;rico (20-25 kcal/kg/d) con un aumento del aporte proteico (&gt; 1,5 g/kg/d), pero desconocemos d&oacute;nde est&aacute; el l&iacute;mite (39).</p>
    ]]></body>
<body><![CDATA[<p>En el paciente con SDRA la cantidad de glucosa aportada no debe superar el 40-50% de las calor&iacute;as no proteicas, y ello dependiendo de los niveles plasm&aacute;ticos de glucosa y triglic&eacute;ridos. Aunque la cantidad de glucosa captada por el pulm&oacute;n es peque&ntilde;a, sus funciones no energ&eacute;ticas son trascendentes (34,40).</p>
    <p>Las grasas, sustrato energ&eacute;tico ideal en la insuficiencia respiratoria por su bajo cociente respiratorio y su alta densidad cal&oacute;rica, pueden presentar problemas en el paciente con SDRA (34). Los triglic&eacute;ridos de cadena larga (TCL), que aportan &aacute;cidos grasos esenciales, son bien tolerados a dosis &lt; 2 g/kg/d&iacute;a en los pacientes con bajo grado de estr&eacute;s, pero su eficacia nutricional es cuestionada en el paciente cr&iacute;tico (34). Numerosos estudios han comprobado un aumento del <i>shunt</i> pulmonar y descensos en la presi&oacute;n arterial de ox&iacute;geno en pacientes con neumon&iacute;a o SDRA. Este hecho se explicar&iacute;a por el efecto de los eicosanoides y tromboxanos, generados a partir del &aacute;cido araquid&oacute;nico (producido por el exceso de &aacute;cido linoleico de las emulsiones de TCL) sobre la vasoconstricci&oacute;n hip&oacute;xica pulmonar (34,41). Las mezclas de TCL con triglic&eacute;ridos de cadena media (TCM), en proporci&oacute;n 1:1 o 1:2, consiguen reducir la cantidad de &aacute;cido linoleico y disminuir los efectos sobre la funci&oacute;n pulmonar, el bloqueo del sistema reticuloendotelial y los cambios inmunitarios desfavorables (34,41).</p>
    <p>Otras fuentes lip&iacute;dicas como los omega-3 (abundante en el aceite de oliva y de colza) permitir&iacute;an una menor liberaci&oacute;n de eicosanoides, con el objetivo de modular la respuesta inflamatoria pulmonar (34,41). Pero hasta el momento, los estudios han sido contradictorios en demostrar la eficacia cl&iacute;nica de las dietas con combinaciones de grasas ricas en &aacute;cidos eicosapentanoico (EPA), docosahexaenoico (DHA), &gamma;-linol&eacute;nico (GLA) y antioxidantes en el complejo mundo de la LPA y el SDRA (42-51). La heterogenicidad de los estudios, la ausencia de informaci&oacute;n sobre el manejo cl&iacute;nico, la utilizaci&oacute;n de f&oacute;rmulas con mezclas de farmaconutrientes y la disparidad de resultados hacen que no se pueda recomendar el uso rutinario de estas f&oacute;rmulas enterales (52).</p>
    <p>Sin embargo, estudios en NP donde se utilizan emulsiones lip&iacute;dicas enriquecidas con omega-3 provenientes del aceite de pescado (53,54), se&ntilde;alan una disminuci&oacute;n en el n&uacute;mero de infecciones nosocomiales, un incremento de los d&iacute;as libres de infecci&oacute;n en pacientes m&eacute;dicos y quir&uacute;rgicos, con una menor duraci&oacute;n de la VM y de la estancia hospitalaria, siendo, adem&aacute;s, un tratamiento coste-efectivo (55). Estas emulsiones se consideran seguras y no se han reportado efectos adversos significativos e incluso han mejorado o revertido la toxicidad hep&aacute;tica de la NP (56). En consecuencia, parece l&oacute;gico recomendar NP enriquecida con omega-3 en pacientes cr&iacute;ticos con SDRA que precisan NP (54).</p>
    <p>No existen recomendaciones espec&iacute;ficas para el aporte proteico en el SDRA, se deben ajustar al grado de estr&eacute;s metab&oacute;lico del paciente (34,40). Del metabolismo pulmonar se desprende el posible beneficio de aportar glutamina y hay que considerar el efecto del aporte de amino&aacute;cidos, especialmente los de cadena ramificada, aumentando el impulso o <i>drive</i> respiratorio. Este efecto puede ser de utilidad en el destete del respirador, pero puede contribuir al agotamiento de los pacientes con escasa reserva alveolar. No disponemos de estudios para establecer recomendaciones sobre el empleo glutamina, amino&aacute;cidos ramificados, vitaminas o antioxidantes en este grupo de pacientes, aunque la utilizaci&oacute;n de antioxidantes en forma de suplementos vitam&iacute;nicos parece l&oacute;gica y razonablemente segura (39,57).</p>
    <p>&nbsp;</p>

    <p><b>OTRAS MEDIDAS EN EL MANEJO DEL PACIENTE CON PATOLOG&Iacute;A PULMONAR</b></p>
    <p>M&uacute;ltiples estudios epidemiol&oacute;gicos han se&ntilde;alado el potencial efecto protector de los vegetales y frutas debido a su alta concentraci&oacute;n en sustancias antioxidantes (vitamina A, vitamina E) y de la fibra con propiedades antiinflamatorias (enlentecimiento de la absorci&oacute;n de glucosa y de almid&oacute;n, disminuci&oacute;n de oxidaci&oacute;n lip&iacute;dica o mediante la influencia de producci&oacute;n de citoquinas antiinflamatorias por la flora intestinal) (58,59). Por tanto, debe recomendarse este tipo de dieta en prevenci&oacute;n primaria de la enfermedad (60).</p>
    <p>En el paciente con EPOC la combinaci&oacute;n de asesoramiento diet&eacute;tico, autocontroles y tratamiento conductual puede ayudar a mejorar la ingesta y conseguir un aporte nutritivo adecuado para evitar la p&eacute;rdida de peso (61). Solo excepcionalmente ser&iacute;a necesario modificar la proporci&oacute;n de macronutrientes, siendo m&aacute;s &uacute;til procurar que el paciente reciba una dieta variada y adaptada a sus necesidades. Evitar alimentos productores de gas y el fraccionamiento en varias tomas (5-6 comidas al d&iacute;a) puede resultar &uacute;til a la hora de conseguir una mayor ingesta (62). Tambi&eacute;n se ha podido comprobar la efectividad de acetato de megestrol como estimulante del apetito (63). Nuevos estudios est&aacute;n en marcha con utilizaci&oacute;n de otros f&aacute;rmacos como los an&aacute;logos de la grelina para el tratamiento de la caquexia (64).</p>
    <p>La utilizaci&oacute;n de suplementos es controvertida, aunque un reciente estudio demuestra que el soporte nutricional en forma de suplementos consigue aumentar la ingesta, mejorar las medidas antropom&eacute;tricas e incluso aumentar la fuerza muscular (65).</p>
    ]]></body>
<body><![CDATA[<p>En caso de necesitar nutrici&oacute;n artificial la v&iacute;a de elecci&oacute;n es la enteral, pero es importante ser conscientes de la dificultad que existe para conseguir administrar &gt; 80% de los requerimientos calculados en NE en un paciente cr&iacute;tico con SDRA habitualmente sometido a sedaci&oacute;n y relajaci&oacute;n profunda, con alteraci&oacute;n de la motilidad intestinal y del vaciado g&aacute;strico. Cuando se produce intolerancia a la NE, a pesar de procin&eacute;ticos y descartada la complicaci&oacute;n abdominal, la primera medida a considerar es la NE transpil&oacute;rica y, en el caso de que tambi&eacute;n fracase o no consigamos el aporte adecuado, deberemos pensar en la NP complementaria o total. Es importante hacer &eacute;nfasis en evitar las sobrecargas cal&oacute;ricas y en reducir el aporte cal&oacute;rico en el momento del destete del respirador. Tambi&eacute;n, un buen programa de rehabilitaci&oacute;n respiratoria es fundamental para la desconexi&oacute;n de la VM (7).</p>
    <p>La necesidad de maniobras como el dec&uacute;bito prono en los pacientes con insuficiencia respiratoria grave no contraindica la utilizaci&oacute;n de la NE. Recientes estudios han demostrado que el grado de tolerancia a la NE no depende de la posici&oacute;n y no se asocia a mayores complicaciones gastrointestinales ni aumento de las neumon&iacute;as por broncoaspiraci&oacute;n (66,67).</p>
    <p>En definitiva, todos nuestros esfuerzos deben ir encaminados a evitar la desnutrici&oacute;n y mejorar la calidad de vida de los pacientes cr&oacute;nicos complejos, evitando con la prevenci&oacute;n los ingresos hospitalarios por reagudizaci&oacute;n respiratoria. La optimizaci&oacute;n del soporte nutricional en fase de descompensaci&oacute;n respiratoria, junto con un buen programa de rehabilitaci&oacute;n, ayudar&aacute;n a evitar una mayor p&eacute;rdida de peso y de masa magra que condicionen una peor evoluci&oacute;n al alta.</p>
    <p>&nbsp;</p>

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</font>
    <p>&nbsp;</p>
    <p>&nbsp;</p>

<font face="Verdana" size="2">
    <p><a href="#top"><img border="0" src="/img/revistas/nh/v34s1/seta.gif"></a><a name="bajo"></a><b>Direcci&oacute;n para correspondencia:</b>    <br>
M.ª Luisa Bordej&eacute; Laguna.    <br>
Servicio de Medicina Intensiva.    <br>
Hospital Germans Trias i Pujol.    <br>
Ctra. Canyet, s/n.    <br>
08916 Badalona, Barcelona    ]]></body>
<body><![CDATA[<br>
e-mail: <a href="mailto:luisabordeje@gmail.com">luisabordeje@gmail.com</a></p>
</font>

     ]]></body><back>
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