<?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>0124-8146</journal-id>
<journal-title><![CDATA[Investigaciones Andina]]></journal-title>
<abbrev-journal-title><![CDATA[Investig. andina]]></abbrev-journal-title>
<issn>0124-8146</issn>
<publisher>
<publisher-name><![CDATA[Fundación Universitaria del Área Andina - FUNANDI]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0124-81462010000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[SOPORTE NUTRICIONAL EN ENFERMEDAD PULMONAR: UNA REVISIÓN SISTEMÁTICA]]></article-title>
<article-title xml:lang="en"><![CDATA[PARENTERAL NUTRITION IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE: UMA REVISÃO SISTEMÁTICA]]></article-title>
<article-title xml:lang="pt"><![CDATA[SUPORTE NUTRICIONAL EM ENFERMIDADE PULMONAR]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cobróles Vega]]></surname>
<given-names><![CDATA[Rodolfo A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Tecnológica de Pereira Programa de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<volume>12</volume>
<numero>21</numero>
<fpage>71</fpage>
<lpage>86</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0124-81462010000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0124-81462010000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0124-81462010000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: los pacientes con enfermedad pulmonar aguda (Síndrome de Dificultad Respiratoria Aguda -SDRA/ Lesión Pulmona Aguda-LPA) o crónica (Enfermedad Pulmonar Obstructiva Crónica- EPOC), presentan una importante alteración de su estado nutricional. La pérdida de peso tiene un efecto negativo en el curso clínico de estos pacientes. Las causas incluyen un disbalance energético, un incremento en las citoquinas, hipoxia y uso de glucocorticoides. El soporte nutricional está usualmente indicado como terapéutica o como apoyo en el tratamiento. Métodos: ésta es una revisión sistemática de literatura que consultó 1.026 números y seleccionó 87 artículos por su calidad y pertinencia. Resultados: se han propuesto diversas fórmulas de Nutrición Enteral (NE) y parenteral (NP) para contrarrestar los efectos adversos relacionados con el incremento en las demandas de ventilación mecánica de los pacientes alimentados con fórmulas estándar con altos contenidos de carbohidratos. Sin embargo, el uso de fórmulas especiales en pacientes con enfermedad pulmonar sigue siendo objeto de controversia. Conclusión: esta revisión sistemática tuvo como propósito mostrar los principales factores asociados con la malnutrición en las enfermedades pulmonares y examinar objetivamente el uso de las fórmulas de nutrición enteral y parenteral en enfermedad pulmonar aguda y crónica. Incluye los estudios que evalúan la eficacia de estas fórmulas y aporta recomendaciones básicas para su uso en enfermedades pulmonares específicas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: the potential for altered nutritional status in critically ill patients with either acute (Acute Respiratory Distress Syndrome-ARDS/Acute Lung Injury-ALI) or chronic pulmonary disease (Chronic Obstructive Pulmonary Disease) is significant. Weight loss in patients with chronic obstructive pulmonary disease has a negative effect on the clinical course of the patient. Causes of weight loss in this population are known to include effects of an energy imbalance, increased cytokines, hypoxia, and glucocorticoid use. Nutritional support is often indicated as a treatment modality. Methods: we searched 1026 articles and was selected 87 articles. Results: several enteral and parenteral formulas (EN-PN) have been suggested to help counteract the possible adverse respiratory effects associated with a standard formula with higher carbohydrates content to reduce ventilator demand of the patients. However, the use of these specialized enteral formulas in individuals with pulmonary disease remains controversial. Conclusion: the purposes of this systematic review was to synthesize the factors associated with malnutrition in pulmonary diseases and to evaluate the rationale for use of modified parenteral and enteral formulas in both chronic and acute pulmonary disease. This paper includes the available studies evaluating the efficacy of these formulas, and provides overall recommendations for the use of specialized formulas in individuals with pulmonary disease.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Introdução: os pacientes com enfermidade pulmonar aguda (Síndrome de Dificuldade Respiratória Aguda -SDRA/ Lesão Pulmonar Aguda -LPA) ou crônica (Enfermidade Pulmonar Obstrutiva Crônica- EPOC), apresentam uma importante alteração de seu estado nutricional. A perda de peso tem um efeito negativo no curso clínico destes pacientes. As causas incluem um desequilíbrio energético, um incremento nas citoquimicas, hipoxia e uso de glucocorticoides. O suporte nutricional está usualmente indicado como terapêutico ou como apoio no tratamento. Métodos: este é uma revisão sistemática da literatura que consultou 1026 números e selecionou 87 artigos por sua qualidade e pertinência. Resultados: têm-se proposto diversasfórmulas de Nutrição Enteral (NE) e parenteral (NP) para contra restar os resultados adversos relacionados ao incremento nas demandas de ventilação mecânica dos pacientes alimentados com fórmulas uniformes com altos conteúdos de carboidratos. Mas o uso de fórmulas especiais em pacientes com doenças pulmonar segue sendo objeto de controvérsia. Conclusão: esta revisão sistemática teve como propósito mostrar os principais fatores associados à má nutrição nas enfermidades pulmonares e examinar objetivamente o uso das fórmulas de nutrição enteral e parenteral em enfermidades pulmonares agudas e crônicas. Inclui estudos que avaliam a eficácia destas fórmulas e traz recomendações básicas para seu uso em enfermidades pulmonares específicas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[síndrome de dificultad respiratoria del adulto (SDRA)]]></kwd>
<kwd lng="es"><![CDATA[lesión pulmonar aguda (LPA)]]></kwd>
<kwd lng="es"><![CDATA[enfermedad pulmonar obstructiva crónica (EPOC)]]></kwd>
<kwd lng="es"><![CDATA[nutrición enteral]]></kwd>
<kwd lng="es"><![CDATA[nutrición parenteral]]></kwd>
<kwd lng="es"><![CDATA[ácidos grasos poliinsaturados omega 3]]></kwd>
<kwd lng="en"><![CDATA[acute respiratory distress syndrome]]></kwd>
<kwd lng="en"><![CDATA[acute lung injury]]></kwd>
<kwd lng="en"><![CDATA[chronic obstructive pulmonary disease]]></kwd>
<kwd lng="en"><![CDATA[enteral nutrition]]></kwd>
<kwd lng="en"><![CDATA[parenteral nutrition]]></kwd>
<kwd lng="en"><![CDATA[omega-3 fatty acids]]></kwd>
<kwd lng="pt"><![CDATA[síndrome de dificuldade respiratória do adulto (SDRA)]]></kwd>
<kwd lng="pt"><![CDATA[lesão pulmonar aguda (LPA)]]></kwd>
<kwd lng="pt"><![CDATA[enfermidade pulmonar obstrutiva crônica (EPOC)]]></kwd>
<kwd lng="pt"><![CDATA[nutrição enteral]]></kwd>
<kwd lng="pt"><![CDATA[nutrição parenteral]]></kwd>
<kwd lng="pt"><![CDATA[ácidos grassos poliinsaturados omega 3]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="center"><font size="4"><b>SOPORTE NUTRICIONAL EN ENFERMEDAD PULMONAR: UNA REVISI&Oacute;N SISTEM&Aacute;TICA</b></font></p>     <p align="center"><b><font size="3">PARENTERAL NUTRITION IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE</font></b></p>     <p align="center"><font size="3"><b>SUPORTE NUTRICIONAL EM ENFERMIDADE PULMONAR:  UMA REVIS&Atilde;O SISTEM&Aacute;TICA</b></font></p>     <p><b>Rodolfo A. Cobr&oacute;les Vega - MD*</b></p>     <p>*     Especialista en Cirug&iacute;a General. Instructor Nacional TNT Coordinador GSMN Hospital Universitario San Jorge de Pereira. Profesor Asociado Programa de Medicina Universidad Tecnol&oacute;gica de Pereira. Env&iacute;o de correspondencia: <a href="mailto:rocabster@gmail.com">rocabster@gmail.com</a></p> <hr>     <p><b><font size="3">Resumen</font></b></p>     <p><b><i>Introducci&oacute;n: </i></b><i>los pacientes con enfermedad pulmonar aguda (S&iacute;ndrome de Dificultad Respiratoria Aguda -SDRA/ Lesi&oacute;n Pulmona Aguda-LPA) o cr&oacute;nica (Enfermedad Pulmonar Obstructiva Cr&oacute;nica- EPOC), presentan una importante alteraci&oacute;n de su estado nutricional. La p&eacute;rdida de peso tiene un efecto negativo en el curso cl&iacute;nico de estos pacientes. Las causas incluyen un disbalance energ&eacute;tico, un incremento en las citoquinas, hipoxia y uso de glucocorticoides. El soporte nutricional est&aacute; usualmente indicado como terap&eacute;utica o como apoyo en el tratamiento.</i></p>     <p><b><i>M&eacute;todos: </i></b><i>&eacute;sta es una revisi&oacute;n sistem&aacute;tica de literatura que consult&oacute; 1.026 n&uacute;meros y seleccion&oacute; 87 art&iacute;culos por su calidad y pertinencia.</i></p>     <p><b><i>Resultados: </i></b><i>se han propuesto diversas f&oacute;rmulas de Nutrici&oacute;n Enteral (NE) y parenteral (NP) para contrarrestar los efectos adversos relacionados con el incremento en las demandas de ventilaci&oacute;n mec&aacute;nica de los pacientes alimentados con f&oacute;rmulas est&aacute;ndar con altos contenidos de carbohidratos. Sin embargo, el uso de f&oacute;rmulas especiales en pacientes con enfermedad pulmonar sigue siendo objeto de controversia.</i></p>     ]]></body>
<body><![CDATA[<p><b><i>Conclusi&oacute;n: </i></b><i>esta revisi&oacute;n sistem&aacute;tica tuvo como prop&oacute;sito mostrar los principales factores asociados con la malnutrici&oacute;n en las enfermedades pulmonares y examinar objetivamente el uso de las f&oacute;rmulas de nutrici&oacute;n enteral y parenteral en enfermedad pulmonar aguda y cr&oacute;nica. Incluye los estudios que eval&uacute;an la eficacia de estas f&oacute;rmulas y aporta recomendaciones b&aacute;sicas para su uso en enfermedades pulmonares espec&iacute;ficas.</i></p>     <p><b><i><font size="3">Palabras clave:</font> </i></b>s&iacute;ndrome de dificultad respiratoria del adulto (SDRA); lesi&oacute;n pulmonar aguda (LPA); enfermedad pulmonar obstructiva cr&oacute;nica (EPOC); nutrici&oacute;n enteral, nutrici&oacute;n parenteral, &aacute;cidos grasos poliinsaturados omega 3</p> <hr>     <p><b><font size="3">Abstract</font></b></p>     <p><b><i>Introduction: </i></b><i>the potential for altered nutritional status in critically ill patients with either acute (Acute Respiratory Distress Syndrome-ARDS/Acute Lung Injury-ALI) or chronic pulmonary disease (Chronic Obstructive Pulmonary Disease) is significant. Weight loss in patients with chronic obstructive pulmonary disease has a negative effect on the clinical course of the patient. Causes of weight loss in this population are known to include effects of an energy imbalance, increased cytokines, hypoxia, and glucocorticoid use. Nutritional support is often indicated as a treatment modality.</i></p>     <p><b><i>Methods: </i></b><i>we searched 1026 articles and was selected 87 articles.</i></p>     <p><b><i>Results: </i></b><i>several enteral and parenteral formulas (EN-PN) have been suggested to help counteract the possible adverse respiratory effects associated with a standard formula with higher carbohydrates content to reduce ventilator demand of the patients. However, the use of these specialized enteral formulas in individuals with pulmonary disease remains controversial.</i></p>     <p><b><i>Conclusion: </i></b><i>the purposes of this systematic review was to synthesize the factors associated with malnutrition in pulmonary diseases and to evaluate the rationale for use of modified parenteral and enteral formulas in both chronic and acute pulmonary disease. This paper includes the available studies evaluating the efficacy of these formulas, and provides overall recommendations for the use of specialized formulas in individuals with pulmonary disease.</i></p>     <p><b><i><font size="3">Keywords:</font> </i></b>acute respiratory distress syndrome, acute lung injury, chronic obstructive pulmonary disease, enteral nutrition, parenteral nutrition, omega-3 fatty acids</p> <hr>     <p><b><font size="3">Resumo</font></b></p>     <p><b><i>Introdu&ccedil;&atilde;o: </i></b><i>os pacientes com enfermidade pulmonar aguda (S&iacute;ndrome de Dificuldade Respirat&oacute;ria Aguda -SDRA/ Les&atilde;o Pulmonar Aguda -LPA) ou cr&ocirc;nica (Enfermidade Pulmonar Obstrutiva Cr&ocirc;nica- EPOC), apresentam uma importante altera&ccedil;&atilde;o de seu estado nutricional. A perda de peso tem um efeito negativo no curso cl&iacute;nico destes pacientes. As causas incluem um desequil&iacute;brio energ&eacute;tico, um incremento nas citoquimicas, hipoxia e uso de glucocorticoides. O suporte nutricional est&aacute; usualmente indicado como terap&ecirc;utico ou como apoio no tratamento.</i></p>     ]]></body>
<body><![CDATA[<p><b><i>M&eacute;todos: </i></b><i>este &eacute; uma revis&atilde;o sistem&aacute;tica da literatura que consultou 1026 n&uacute;meros e selecionou 87 artigos por sua qualidade e pertin&ecirc;ncia.</i></p>     <p><b><i>Resultados: </i></b><i>t&ecirc;m-se proposto diversasf&oacute;rmulas de Nutri&ccedil;&atilde;o Enteral (NE) e parenteral (NP) para contra restar os resultados adversos relacionados ao incremento nas demandas de ventila&ccedil;&atilde;o mec&acirc;nica dos pacientes alimentados com f&oacute;rmulas uniformes com altos conte&uacute;dos de carboidratos. Mas o uso de f&oacute;rmulas especiais em pacientes com doen&ccedil;as pulmonar segue sendo objeto de controv&eacute;rsia.</i></p>     <p><b><i>Conclus&atilde;o: </i></b><i>esta revis&atilde;o sistem&aacute;tica teve como prop&oacute;sito mostrar os principais fatores associados &agrave; m&aacute; nutri&ccedil;&atilde;o nas enfermidades pulmonares e examinar objetivamente o uso das f&oacute;rmulas de nutri&ccedil;&atilde;o enteral e parenteral em enfermidades pulmonares agudas e cr&ocirc;nicas. Inclui estudos que avaliam a efic&aacute;cia destas f&oacute;rmulas e traz recomenda&ccedil;&otilde;es b&aacute;sicas para seu uso em enfermidades pulmonares espec&iacute;ficas.</i></p>     <p><b><i><font size="3">Palavras chave:</font></i></b><font size="3"><i> </i></font>s&iacute;ndrome de dificuldade respirat&oacute;ria do adulto (SDRA); les&atilde;o pulmonar aguda (LPA); enfermidade pulmonar obstrutiva cr&ocirc;nica (EPOC); nutri&ccedil;&atilde;o enteral, nutri&ccedil;&atilde;o parenteral, &aacute;cidos grassos poliinsaturados omega 3</p>     <p><b><i>Fecha de recibo: </i></b>Febrero/2010     <br>     <b><i>Fecha aprobaci&oacute;n:</i></b><i> </i>Agosto/2010</p> <hr>     <p><b><font size="3">Introducci&oacute;n</font></b></p>     <p>La enfermedad pulmonar obstructiva cr&oacute;nica y la falla respiratoria constituyen patolog&iacute;as de alta prevalencia en los centros hospitalarios de Colombia y del mundo. Su presentaci&oacute;n aguda o cr&oacute;nica reagudizada implica entre otras consecuencias prolongadas estancias hospitalarias, y en Unidades de Cuidado Intensivo (UCI) tiempos largos de dependencia al ventilador, en resumen, una alta morbilidad y mortalidad, as&iacute; como enormes costos hospitalarios.</p>     <p>Adicionalmente, muchos de estos pacientes cursan con pobres estados nutricionales que influyen negativamente en todas las variables antes mencionadas.</p>     <p>Pese a los importantes avances de los &uacute;ltimos a&ntilde;os, algunos aspectos de la terapia nutricional en pacientes con Enfermedad Pulmonar Obstructiva Cr&oacute;nica (EPOC), Lesi&oacute;n Pulmonar Aguda/Sindrome de Dificultad Respiratoria del Adulto (LPA/ SDRA) permanecen sin respuesta clara. A pesar de las investigaciones realizadas, existen serias controversias en lo que respecta al tipo de nutriente ideal, la ruta de administraci&oacute;n, la clase de mezcla y sus reales ventajas, principalmente en t&eacute;rminos de la disminuci&oacute;n en la morbilidad, la mortalidad, la estancia en UCI y el tiempo de uso del ventilador.</p>     ]]></body>
<body><![CDATA[<p>La presente revisi&oacute;n pretende mostrar los m&aacute;s importantes avances en este campo y proponer, a la luz de la medicina basada en la evidencia, algunas recomendaciones sobre el manejo nutricional de este grupo de pacientes.</p>     <p><b><font size="3">M&eacute;todo</font></b></p>     <p>Se realiz&oacute; una b&uacute;squeda en las siguientes bases de datos: OVID (Full Text) (20002010), SCIENCE DIRECT (20002010), MEDLINE v&iacute;a PubMed (20002010), Cochrane Central Register of Controlled Trials (2000-Abril de 2010) and  ClinicalTrials.gov  (2000-2010).</p>     <p>Adicionalmente se revisaron las revistas especializadas: <i>Journal of Parenteral and Enteral Nutrition, Nutrition and Clinical Practice, American Journal of Clinical Nutrition, Clinical Nutrition </i>y <i>Nutrition, </i>durante el m&iacute;smo per&iacute;odo con el fin de soportar conceptualmente la fisiopatolog&iacute;a y las implicaciones nutricionales del paciente con EPOC o LPA/SDRA.</p>     <p>Se incluyeron solo estudios controlados aleatorizados (ERCT), estudios antes-despu&eacute;s de tratamiento (pre-post) y metaan&aacute;lisis referidos exclusivamente a la relaci&oacute;n terapia nutricional: enfermedad pulmonar aguda (LPA/SDRA) o cr&oacute;nica (EPOC).</p>     <p>La estrategia de b&uacute;squeda incluy&oacute; los siguientes t&eacute;rminos MESH: LUNG DISEASE, PULMONARY DISEASE, ACUTE LUNG INJURY, CHRONIC OBSTRUCTIVE PULMONAR DISEASE, ACUTE RESPIRATORY DISTRESS SYNDROME combinado con el operador booleano AND a los t&eacute;rminos MESH: NUTRITION, NUTRITIONAL SUPPORT, ENTERAL NUTRITION, PARENTERAL NUTRITION, CRITICAL CARE.</p>     <p>La etapa de selecci&oacute;n arroj&oacute; un total de 1026 art&iacute;culos relacionados, de los cuales 87 cumplieron los requisitos de inclusi&oacute;n. (<a href="#c1">Cuadro 1</a>)</p>     <p align="center"><a name="c1"><img src="img/revistas/inan/v12n21/v12n21a07i1.jpg"></a></p>     <p>Basado en estos hallazgos se presentan una serie de recomendaciones cl&iacute;nicas respecto al soporte nutricional en el grupo de pacientes con enfermedad pulmonar aguda o cr&oacute;nica.</p>     <p><b>Enfermedad pulmonar y desnutrici&oacute;n</b></p>     ]]></body>
<body><![CDATA[<p>La magnitud del problema de la desnutrici&oacute;n en el paciente hospitalizado qued&oacute; evidenciado en el estudio publicado por <i>Nutrition </i>en el 2003. Los resultados muestran que uno de cada dos pacientes hospitalizados por cualquier causa presenta desnutrici&oacute;n, siendo de moderada a severa hasta en el 50% de la poblaci&oacute;n de estudio (1).</p>     <p>La Enfermedad Pulmonar Obstructiva Cr&oacute;nica (EPOC) es una causa frecuente de hospitalizaci&oacute;n en muchos centros de atenci&oacute;n del mundo. La desnutrici&oacute;n puede llegar al 60% para los pacientes hospitalizados y oscilar entre el 25 y el 65% para los pacientes ambulatorios. Datos del Instituto Nacional de Salud de Estados Unidos reportan que cerca del 10% de los americanos mayores de 45 a&ntilde;os padecen de esta enfermedad y se constituye en la cuarta causa de muerte.</p>     <p>En cifras netas, aproximadamente 14 millones de personas tienen EPOC, 12.5 millones cursan con bronquitis cr&oacute;nica y casi 2 millones padecen de enfisema. Globalmente el EPOC se convierte en la duod&eacute;cima enfermedad del mundo con mayor prevalencia, y se proyecta hacia el quinto lugar en la prevalencia y el tercero en mortalidad, hacia el a&ntilde;o 2020 (2).</p>     <p>Adicionalmente, la p&eacute;rdida de peso y la malnutrici&oacute;n proteico-cal&oacute;rica son aspectos prominentes de los pacientes con EPOC, especialmente en el grupo con enfisema. Las reservas pulmonares se agravan con la p&eacute;rdida progresiva de peso, al punto que el volumen espiratorio forzado en un segundo (VEF-1) puede estar hasta en un 35% por debajo de lo predicho. Esta fatiga respiratoria se manifiesta en forma de disnea, infecciones respiratorias frecuentes y disminuci&oacute;n en la funci&oacute;n de los m&uacute;sculos principales y accesorios respiratorios (3,4,5).</p>     <p>Esta asociaci&oacute;n desnutrici&oacute;n-EPOC es letal. El bajo peso y la p&eacute;rdida importante de masa magra se encuentran asociadas a un pobre pron&oacute;stico. La supervivencia de un paciente con EPOC asociada a caquexia y FEV1 &lt;50% es aproximadamente de 2-4 a&ntilde;os (Evidencia tipo IIb) (6).</p>     <p>El esfuerzo respiratorio se traduce en un hipermetabolismo agravado por el gasto energ&eacute;tico basal elevado, la ingesta insuficiente de nutrientes y el ineficiente uso de los sustratos energ&eacute;ticos. (<a href="#f1">Figuras 1</a> y <a href="#f2">2</a>)</p>     <p align="center"><a name="f1"><img src="img/revistas/inan/v12n21/v12n21a07i2.jpg"></a></p>     <p align="center"><a name="f2"><img src="img/revistas/inan/v12n21/v12n21a07i3.jpg"></a></p>     <p>El car&aacute;cter inflamatorio que ahora se le reconoce a la enfermedad explica algunos de los cambios bioqu&iacute;micos de los pacientes con EPOC. Se destacan una disminuci&oacute;n de las enzimas oxidativas y ca&iacute;da en los insumos necesarios para el ciclo de Krebs (7).</p>     <p>Existe un aumento en la producci&oacute;n de las citoquinas y su actividad catab&oacute;lica. Por ejemplo, en pacientes con enfisema se aprecia una reducci&oacute;n en la s&iacute;ntesis de prote&iacute;na y aumento en su tasa de degradaci&oacute;n a nivel muscular tal y como ocurrre cuando se administra Factor de Necrosis Tumoral (FNT-a) a miocitos in vitro.<sup>8</sup> Adem&aacute;s de esta citoquina, se observan aumentos en el factor soluble (sFNT-R 55 y sFNT-R75) y en la interleukina-6, entre otros. La hipoxia cr&oacute;nica de los pacientes con enfisema tambi&eacute;n incrementa los niveles de interleucina-1B y de FNT-a a nivel del macr&oacute;fago alveolar.</p>     ]]></body>
<body><![CDATA[<p>Adicional a la astenia que induce la desnutrici&oacute;n, los pacientes con EPOC cursan con pobre tolerancia al ejercicio secundaria a la obstrucci&oacute;n al flujo de aire, al deterioro de la mec&aacute;nica pulmonar y a la disfunci&oacute;n muscular, secundaria al bajo aporte de ox&iacute;geno (9, 10).</p>     <p>Es previsible que, el grupo de pacientes con EPOC exacerbado, tienda a presentar mayor p&eacute;rdida de peso, en una espiral de deterioro que puede conllevar a la muerte (11).</p>     <p>La disnea cr&oacute;nica tambi&eacute;n contribuye en forma indirecta a la desnutrici&oacute;n, porque induce ingesti&oacute;n involuntaria de aire al est&oacute;mago e impide la masticaci&oacute;n y la degluci&oacute;n. El uso cr&oacute;nico de esteroides o de medicamentos P2 agonistas, ambos agentes hipercatab&oacute;licos, contribuyen a agravar a&uacute;n m&aacute;s el problema. Esa catabolia de los glucocorticoides se explica en un aumento de la prote&oacute;lisis y en una inhibici&oacute;n de la s&iacute;ntesis y transporte de los amino&aacute;cidos en la c&eacute;lula muscular. Un mecanismo sin&eacute;rgico con la acidosis y la malnutrici&oacute;n, que contribuyen a una degradaci&oacute;n mayor de la prote&iacute;na muscular (12).</p>     <p>En resumen, el paciente con EPOC es un paciente desnutrido. Ello significa una alteraci&oacute;n en una importante serie de eventos metab&oacute;licos &iacute;ntimamente relacionados, entre los cuales se destacan: la interacci&oacute;n de c&eacute;lulas inmunes y fagocitos; la liberaci&oacute;n de poderosas citoquinas que comprometen el uso de los sustratos nutricionales; la evocaci&oacute;n de una respuesta inmune espec&iacute;fica, secundaria a la exposici&oacute;n del ant&iacute;geno por parte del macr&oacute;fago al linfocito; la supresi&oacute;n de la lipoproteinlipasa del adipocito y la desaparici&oacute;n de la ingesta de alimento a nivel central.</p>     <p><b>Soporte Nutricional en EPOC</b></p>     <p>Mallampalli public&oacute; una completa revisi&oacute;n sobre este t&oacute;pico en la revista <i>Nutrition in Clinical Practice </i>en el 2004 (13). Los resultados mostrados permiten inferir que aunque es claro que la desnutrici&oacute;n aumenta la morbilidad en EPOC, la instauraci&oacute;n de reg&iacute;menes nutricionales agresivos no se traduce en una mejor&iacute;a en el pron&oacute;stico final (14).</p>     <p>Ferreira, Lacasse y cols. revisaron la evidencia existente sobre los reales beneficios de una suplementaci&oacute;n nutricional en pacientes con EPOC estables. Se tuvieron en cuenta 14 estudios (487 pacientes). El efecto del soporte nutricional fue peque&ntilde;o. Con la excepci&oacute;n de dos estudios (15,16), en general no se demostr&oacute; efecto ben&eacute;fico sobre las medidas antropom&eacute;tricas ni sobre la funci&oacute;n pulmonar o la capacidad para el ejercicio (17).</p>     <p>Las f&oacute;rmulas enriquecidas con &aacute;cidos grasos poliinsaturados (del grupo co-3) han mostrado su efectividad en pacientes estables con EPOC. Su uso prolongado produce mejor&iacute;as en par&aacute;metros cl&iacute;nicos y de laboratorio, tales como el test de disnea al ejercicio y la disminuci&oacute;n de citoquinas del tipo Leucotrieno B4, FNT-a e interleuquina-8 en esputo, respectivamente (18).</p>     <p>Lo anterior se podr&iacute;a explicar de la siguiente manera: Un individuo normal requiere en promedio 25 a 30 calor&iacute;as por kilo por d&iacute;a. Es evidente que una disminuci&oacute;n en el aporte cal&oacute;rico diario tendr&aacute; efectos en las funciones corporales, entre ellas, la pulmonar. Si a una persona sana se la somete en forma voluntaria a una restricci&oacute;n cal&oacute;rica severa (menos de 500 calor&iacute;as al d&iacute;a), este r&eacute;gimen hipocal&oacute;rico se traduce en disminuci&oacute;n del volumen minuto y en una ca&iacute;da de la respuesta compensatoria a la hipoxia.</p>     <p>En forma cr&oacute;nica, la restricci&oacute;n cal&oacute;rica produce p&eacute;rdida de la masa muscular, alteraciones de la funci&oacute;n y movilidad del diafragma y de los m&uacute;sculos accesorios de la respiraci&oacute;n. Adicionalmente, el trabajo respiratorio se incrementa en promedio diez veces m&aacute;s por efectos de la disnea. La desnutrici&oacute;n conlleva disminuci&oacute;n de las prote&iacute;nas s&eacute;ricas pulmonares, alteraciones en la tensi&oacute;n superficial intraalveolar y efectos delet&eacute;reos en la s&iacute;ntesis y degradaci&oacute;n del surfactante pulmonar, lo cual se traduce en una mayor dificultad para la movilizaci&oacute;n de secreciones y en un aumento secundario de la probabilidad de infecci&oacute;n (19.</p>     ]]></body>
<body><![CDATA[<p>Basados en la anterior argumentaci&oacute;n, la opci&oacute;n terap&eacute;utica m&aacute;s l&oacute;gica ser&iacute;a la de aumentar la cantidad de nutrientes como una manera de contrarrestar los nocivos efectos de la desnutrici&oacute;n sobre el sistema respiratorio. Sin embargo, esta iniciativa puede acarrear otros problemas, el mayor de los cuales se resume en el aumento de la producci&oacute;n final de di&oacute;xido de carbono, que, a su vez, implica un aumento en el aporte cal&oacute;rico mediado por carbohidratos. Este incremento en el di&oacute;xido de carbono debe ser excretado por v&iacute;a a&eacute;rea, lo que conlleva un incremento en el trabajo respiratorio de un paciente con una limitada funci&oacute;n pulmonar.</p>     <p>Y es que cada uno de los tres macronutrientes utiliza una cantidad definida de ox&iacute;geno y produce un total definido de di&oacute;xido de carbono. La divisi&oacute;n produce lo que se conoce como cociente respiratorio. Los carbohidratos tiene el RQ m&aacute;s alto y las grasas el menor.</p>     <p align="center"><img src="img/revistas/inan/v12n21/v12n21a07i4.jpg"></p>     <p>El efecto de la ingesta de carbohidratos en el paciente con EPOC fue estudiado por Talpers y cols. Cuando se compar&oacute; la producci&oacute;n de di&oacute;xido de carbono en pacientes con f&oacute;rmulas fijas 60: 20 (60% de carbohidratos y 20% de grasa) Vs. pacientes con f&oacute;rmulas isocal&oacute;ricas variables (porcentaje de carbohidratos que oscilaron entre 45% y 75% del gasto cal&oacute;rico total) se hall&oacute; que la producci&oacute;n de di&oacute;xido de carbono era directamente proporcional al incremento en las calor&iacute;as (por encima del 50% de los requerimientos basales) lo cual permite concluir que m&aacute;s que modificar el porcentaje de los macronutrientes en la dieta, lo que importa es evitar el exceso de calor&iacute;as no proteicas.</p>     <p>En resumen, un objetivo racional para instaurar terapia nutricional en pacientes con EPOC, es calcular el Gasto Energ&eacute;tico Basal (GEB) e incrementar no m&aacute;s de un 30% adicional al gasto calculado. En cuanto al aporte proteico aunque no existe consenso en la literatura, es probable que c&aacute;lculos que oscilen alrededor de 1.5 gramos/kilogramo/d&iacute;a, sean razonablemente seguros.</p>     <p>Sobre el uso de f&oacute;rmulas espec&iacute;ficas en EPOC, las revisiones objeto de este art&iacute;culo tuvieron en cuenta al menos dos variables: la condici&oacute;n general del paciente (ambulatorio u hospitalizado) y su estado nutricional. Los resultados de estudios no controlados sugieren que la relaci&oacute;n l&iacute;pido-carbohidrato afecta la producci&oacute;n de CO2, pero solamente en pacientes sobrealimentados en Unidad de Cuidados Intensivos (UCI) y a la producci&oacute;n de CO2 y lipog&eacute;nesis secundaria inducida por el exceso del aporte cal&oacute;rico (20).</p>     <p>En pacientes ambulatorios estables, se compararon f&oacute;rmulas orales ricas en grasa (55.2% grasa, 28.1% carbohidratos) con f&oacute;rmulas a expensas de carbohidratos (31.5% grasa, 54.5% carbohidratos). A diferencia de los pacientes control y de aquellos que recibieron la f&oacute;rmula hipergrasa, los pacientes que tomaron alta carga de carbohidratos experimentaron mayores consumos de ox&iacute;geno, mayor producci&oacute;n de CO2, incrementos en el RQ y tiempos mayores de ventilaci&oacute;n-minuto (21).</p>     <p>Adicionalmente los estudios aciertan al demostrar un efecto ben&eacute;fico de los suplementos orales ricos en grasa, en aquellos pacientes con EPOC y   desnutrici&oacute;n,   principalmente   enpar&aacute;metros como el RQ, VCO2, VO2 y el volumen espiratorio forzado (22,23).</p>     <p>Desde la d&eacute;cada de los 80, se han publicado diferentes estudios que eval&uacute;an el papel de las f&oacute;rmulas hipergrasas para facilitar el destete del ventilador en el grupo de pacientes con EPOC que se encuentran hospitalizados. La mayor&iacute;a de los resultados obtenidos reportan una reducci&oacute;n en los tiempos de ventilador del grupo de estudio, al compararlos con pacientes que recibieron f&oacute;rmula est&aacute;ndar debido a una disminuci&oacute;n del RQ (24).</p>     <p>Sin embargo, m&aacute;s que la constituci&oacute;n misma de la f&oacute;rmula, lo importante es evitar el exceso de calor&iacute;as. Se resalta el efecto sobre el RQ y los aumentos proporcionales en el VCO2 con algunas desventajas, entre las que se destacan: el retardo en el vaciamiento g&aacute;strico y el alto costo de la f&oacute;rmula.</p>     ]]></body>
<body><![CDATA[<p>Pese a que a&uacute;n no existe consenso en el porcentaje de grasa ideal de la f&oacute;rmula enteral, la ruta de administraci&oacute;n genera menos controversia. Como son pacientes con alto riesgo de padecer eventos de broncoaspiraci&oacute;n, (25) la ruta pospil&oacute;rica parece ser la elecci&oacute;n. Sin embargo, reportes recientes sugieren que la ruta intrag&aacute;strica es segura y bien tolerada. La suspensi&oacute;n de la nutrici&oacute;n enteral debido a la presencia repetida de altos residuos g&aacute;stricos, es una raz&oacute;n suficiente para cambiar a una ruta pospil&oacute;rica. Adicionalmente la elecci&oacute;n de la ruta ser&aacute; considerada por el equipo de trabajo, como la adherencia a protocolos espec&iacute;ficos institucionales (26, 27).</p>     <p><b>Soporte nutricional en LpA/SDRA</b></p>     <p>A pesar de haber sido descrita desde 1967,  los  criterios  diagn&oacute;sticos  del S&iacute;ndrome de Dificultad Respiratoria del Adulto (SDRA) s&oacute;lo fueron establecidos hasta 1994. De lo anterior podr&iacute;a inferirse el car&aacute;cter polim&oacute;rfico de la enfermedad y su etiolog&iacute;a variada. Independiente de la definici&oacute;n de SDRA que se utilice, el cuadro incluye a la Lesi&oacute;n Pulmonar Aguda (LPA) como una forma m&aacute;s precoz y menos grave de una enfermedad que, en pleno desarrollo, puede constituirse en la forma cl&iacute;nica m&aacute;s severa de falla respiratoria hipox&eacute;mica.</p>     <p>La incidencia de LPA/SDRA en Estados Unidos oscila entre 56 y 82 casos por 100.000 personas/a&ntilde;o. En Norteam&eacute;rica y Europa, la sepsis severa (de origen pulmonar o extrapulmonar), se constituye en el evento precedente en la aparici&oacute;n de LPA/SDRA (28).</p>     <p>Pese al alto perfil de morbimortalidad que conlleva (30% a 40%), (29) cercano al de enfermedades como el c&aacute;ncer de seno y el complejo VIH/SIDA (30), la etiolog&iacute;a del evento LPA/SDRA permanece oscura. Su tratamiento, por lo tanto, s&oacute;lo est&aacute; dirigido a brindar el soporte ventilatorio y no ventilatorio que, de otra manera, conllevar&iacute;a a la muerte.</p>     <p>El soporte nutricional en SDRA tiene un importante espacio dentro de la terapia, porque muchos de estos pacientes presentan ayuno prolongado (entre 5 y 10 d&iacute;as) agravado por el estado hipermetab&oacute;lico generado por el SDRA.</p>     <p>Explicado como un fen&oacute;meno de car&aacute;cter inflamatorio, es decir, como una respuesta inflamatoria de car&aacute;cter agudo que ocasiona da&ntilde;o a las c&eacute;lulas endoteliales y epiteliales, alteraciones del complejo alveolo-capilar y edema pulmonar secundario, (31, 32, 33) los &uacute;ltimos 15 a&ntilde;os de investigaci&oacute;n en nutrici&oacute;n han introducido f&aacute;rmaconutrientes con un efecto potencial como moduladores de la cascada inflamatoria caracter&iacute;stica de esta patolog&iacute;a. Espec&iacute;ficamente se han estudiado las f&oacute;rmulas enterales con alta proporci&oacute;n de &Aacute;cidos Grasos &omega;-3 (PUFA &omega;-3).</p>     <p>La <a href="#f3">Figura 3</a> presenta en forma resumida el ciclo metab&oacute;lico de los &aacute;cidos grasos en atenci&oacute;n a su origen y estructura qu&iacute;mica. Los peces de agua fr&iacute;a (v.g sardinas, at&uacute;n) son ricos en &aacute;cido eicosapentaenoico (EPA) y en &aacute;cido docosahexaenoico (DHA), metabolitos activos del &aacute;cido alfa linol&eacute;nico (ALA). Esta alta relaci&oacute;n EPA/DHA es el resultado de la ingesta de alimentos ricos en fitoplancton presentes en su cadena alimenticia. Aunque el plancton marino puede ser metabolizado en forma eficiente de ALA a EPA y DHA por la v&iacute;a de las desaturasas, los seres humanos tienen una limitada capacidad para sintetizar EPA y DHA en condiciones basales (s&oacute;lo el 8% de la dieta es metabolizado) lo cual los hace necesarios en la dieta y fundamentales en la suplementaci&oacute;n de pacientes en estado cr&iacute;tico (34).</p>     <p align="center"><a name="f3"><img src="img/revistas/inan/v12n21/v12n21a07i5.jpg"></a></p>     <p>En presencia de SDRA, la s&iacute;ntesis de &aacute;cidos grasos se deriva, v&iacute;a &Aacute;cido Araquid&oacute;nico (AA), hacia la producci&oacute;n de leucotrienos de la serie 4 y prostanoides de la serie 2, con claros efectos proinflamatorios e inmunosupresores.</p>     ]]></body>
<body><![CDATA[<p>Espec&iacute;ficamente se forman prostanoides de la serie 2 (v.g. tromboxano A2, prostaglandina E2) con actividad proinflamatoria, al promover la incorporaci&oacute;n plaquetaria, la trombosis microvascular y la producci&oacute;n de otras citoquinas inflamatorias. La PGE2 tiene actividad proinflamatoria e inmunosupresora, induce fiebre, incrementa la permeabilidad vascular y suprime la proliferaci&oacute;n de linfocitos T. Adicionalmente, el metabolismo del AA por parte de la 5-lipooxigenasa incrementa la producci&oacute;n de leucotrienos de la serie 4, los cuales tambi&eacute;n tienen actividades proinflamatorias (35).</p>     <p>De otra parte, el metabolismo de EPA y DHA por las mismas enzimas forma prostanoides y leucotrienos de las series 3 y 5 respectivamente, entre ellos el tromboxano A3, la prostaglandina E3 y el leucotrieno B5. Sus principales acciones son de tipo antiinflamatorio al inhibir la agregaci&oacute;n plaquetaria, la quimiotaxis y la adhesi&oacute;n celular (36). (<a href="#F3">Figura 3</a>)</p>     <p>Por lo anterior, es previsible dado este car&aacute;cter inflamatorio, que su modulaci&oacute;n puede afectar favorablemente el pron&oacute;stico de SDRA. Surgen as&iacute; los inmunonutrientes, con una actividad antinflamatoria y utilidad en aquel grupo de patolog&iacute;as en las cuales el componente inflamatorio sea crucial (37).</p>     <p>Ahora se sabe que la relaci&oacute;n de los l&iacute;pidos &omega;6:&omega;3 de la dieta, tiene la potencial capacidad de influenciar la respuesta inmune (38).</p>     <p>En el grupo de las f&oacute;rmulas especializadas, aquellas que contienen predomino de &aacute;cidos grasos poliinsaturados &omega;-3 (PUFAs &omega;-3), son probablemente los m&aacute;s importantes y estudiados. Una f&oacute;rmula que contenga una mezcla espec&iacute;fica de l&iacute;pidos con altas fuentes de &aacute;cido &gamma;-linol&eacute;nico (GLA; 18:3 n-6) y de &aacute;cido eicosapentaenoico (EPA; 20:5 n-3) puede revertir la tendencia inflamatoria en SDRA, al incrementar la producci&oacute;n de prostaglandinas de la serie 1 y leucotrienos de la serie 5 cuyos metabolitos est&aacute;n asociados a un estado antiinflamatorio y vasodilatador. Adicionalmente estas f&oacute;rmulas contienen altas cantidades de &alpha;-tocoferol, &beta; caroteno, &aacute;cido asc&oacute;rbico y antioxidantes que pueden tener un papel ben&eacute;fico en el curso de una SDRA (39).</p>     <p>Los resultados de los diferentes estudios de aplicaci&oacute;n de f&oacute;rmulas enterales especializadas para pacientes pulmonares son controvertidos. Aunque en algunos par&aacute;metros se aprecia una clara mejor&iacute;a, la mayor&iacute;a de ellos no acierta a demostrar una disminuci&oacute;n notable en la mortalidad, lo cual al compararlo con los costos que ocasiona su uso, hace cuestionable su indicaci&oacute;n y masificaci&oacute;n. Es probable que una formula densa (1.5 - 2.0 Kcal/ ml) deba ser considerada en aquellos pacientes que requieran restricci&oacute;n en la ingesta de l&iacute;quidos (40).</p>     <p>Los datos precl&iacute;nicos demuestran efectos positivos del uso de EPA y GLA sobre la producci&oacute;n de mediadores inflamatorios, el intercambio gaseoso y el transporte de ox&iacute;geno. Espec&iacute;ficamente los estudios de SDRA inducida por endotoxinas en murinos, muestran importantes diferencias en la poblaci&oacute;n alimentada con aceite de ma&iacute;z, en comparaci&oacute;n con aquella sometida a dietas ricas en EPA y GLA. En el primer grupo se apreci&oacute; un incremento m&aacute;s temprano y prolongado en la permeabilidad pulmonar y en la aparici&oacute;n de hipotensi&oacute;n. El efecto ben&eacute;fico observado en la dieta suplementada, muy posiblemente se debi&oacute; a la disminuci&oacute;n de mediadores proinflamatorios dependientes del AA tales como leucotrienos de la serie 4 (LTB4), tromboxanos de la serie 2 (TXB2) y Prostaglandina E2 (PGE2). <sup>41,</sup> <sup>42</sup></p>     <p>Estudios en humanos muestran por su parte, una mejor&iacute;a significativa en los par&aacute;metros de ventilaci&oacute;n, disminuci&oacute;n del n&uacute;mero de d&iacute;as de soporte ventilatorio y de estancia en Unidad de Cuidados Intensivos (UCI). (43,44). Los pacientes con SDRA que recibieron EPA m&aacute;s GLA presentaron un incremento en la oxigenaci&oacute;n arterial (PaO2/FIO2) y una disminuci&oacute;n significativa en el n&uacute;mero de neutr&oacute;filos en fluido bronquial, al compararlos con el grupo sometido a f&oacute;rmula est&aacute;ndar. Incluso se ha llegado a demostrar un efecto preventivo en la formaci&oacute;n de nuevas &uacute;lceras de dec&uacute;bito en pacientes con LPA. (45).</p>     <p>Pontes-Arruda y cols. en Brasil, demostraron efectos ben&eacute;ficos de una dieta enteral enriquecida con EPA y GLA m&aacute;s antioxidantes, en pacientes con sepsis severa y choque s&eacute;ptico sometidos a ventilaci&oacute;n mec&aacute;nica. En efecto, al compararlos con una dieta isonitr&oacute;gena, los pacientes sometidos a la f&oacute;rmula especial presentaron una reducci&oacute;n del 19.4% en la mortalidad (p=.037). Adem&aacute;s tuvieron mejores par&aacute;metros ventilatorios, un mayor n&uacute;mero de d&iacute;as libres de ventilador (13.4 vs 5.8 p&lt; .001), mayor n&uacute;mero de d&iacute;as fuera de UCI (10.8 vs 4.6 p&lt; .001) y menor desarrollo de SDOM (46). Singer y col. revisaron la evidencia y registran beneficios similares a los de Pontes-Arruda y cols. pero tambi&eacute;n advierten pocos beneficios e incluso riesgos de su uso en otro grupo de pacientes cr&iacute;ticos en UCI (47,48).</p>     <p>La &uacute;nica revisi&oacute;n sistem&aacute;tica existente hasta la fecha de esta revisi&oacute;n concluye que, en pacientes con LPA/SDRA y s&eacute;psis, las f&oacute;rmulas con EPA + GLA pueden modular la respuesta inflamatoria sist&eacute;mica, mejorar el intercambio de gases, reducir la tasa de SDOM, el tiempo de ventilaci&oacute;n mec&aacute;nica y el riesgo de mortalidad (49).</p>     ]]></body>
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<page-range>177-182</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
