<?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>S0212-16112008000700003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tratamiento nutricional en la enfermedad inflamatoria intestinal]]></article-title>
<article-title xml:lang="en"><![CDATA[Nutritional management of inflammatory bowel disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Tárrago]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Puebla Maestu]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miján de la Torre]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Complejo Asistencial de Burgos Servicio de Medicina Interna ]]></institution>
<addr-line><![CDATA[Burgos ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Complejo Asistencial de Burgos Servicio Aparato Digestivo ]]></institution>
<addr-line><![CDATA[Burgos ]]></addr-line>
<country>España</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Complejo Asistencial de Burgos Servicio Medicina Interna Nutrición Clínica]]></institution>
<addr-line><![CDATA[Burgos ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2008</year>
</pub-date>
<volume>23</volume>
<numero>5</numero>
<fpage>418</fpage>
<lpage>428</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112008000700003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112008000700003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112008000700003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los pacientes con enfermedad inflamatoria intestinal presentan mayor riesgo de malnutrición. Por este motivo es muy frecuente que se precise un adecuado soporte nutricional. En estos pacientes se debe utilizar la nutrición enteral a menos que existan contraindicaciones. El soporte nutricional como tratamiento primario no está indicado en adultos (al haberse demostrado una mayor eficacia del tratamiento esteroideo) salvo en caso de intolerancia o falta de respuesta al tratamiento médico. Por el contrario, la nutrición enteral se considera el tratamiento de primera línea en niños. No existe un claro beneficio con el uso de fórmulas específicas (grasa modificada, glutamina...) por lo que no se aconseja su uso rutinario. A pesar de los grandes avances técnicos y científicos existen aún numerosos campos en los que ampliar conocimientos; algunos de los mismos se esbozan en la presente publicación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Patients with inflammatory bowel disease present higher risk for hyponutrition. For this reason, an adequate nutritional support is frequently needed. In these patients, enteral nutrition should be used unless there exist contraindications. Nutritional support as the primary therapy is no indicated in adults (since steroidal therapy has shown to be more effective) but in the case of intolerance or lack of response to medical treatment. By contrast, enteral nutrition is considered a first line therapy in children. There is no clear benefit with the use of specific formulas (modified fat, glutamine...), so that their routine use is not recommended. In spite of the great technical and scientific advances, there are still many fields in which knowledge should be broaden; some of them are pointed out in this publication.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enfermedad de Crohn]]></kwd>
<kwd lng="es"><![CDATA[Colitis ulcerosa]]></kwd>
<kwd lng="es"><![CDATA[Revisión]]></kwd>
<kwd lng="es"><![CDATA[Nutrición artificial]]></kwd>
<kwd lng="es"><![CDATA[Nutrición enteral]]></kwd>
<kwd lng="es"><![CDATA[Nutrición parenteral]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad inflamatoria intestinal]]></kwd>
<kwd lng="en"><![CDATA[Crohn's disease]]></kwd>
<kwd lng="en"><![CDATA[Ulcerative colitis]]></kwd>
<kwd lng="en"><![CDATA[Review]]></kwd>
<kwd lng="en"><![CDATA[Artificial nutrition]]></kwd>
<kwd lng="en"><![CDATA[Enteral nutrition]]></kwd>
<kwd lng="en"><![CDATA[Parenteral nutrition]]></kwd>
<kwd lng="en"><![CDATA[Inflammatory bowel disease]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana" size="2"><a name="top"></a><b>REVISIÓN</b></font></p>     <p align="right">&nbsp;</p>     <p align="left"><font face="Verdana" size="4"><b>Tratamiento nutricional en la enfermedad inflamatoria intestinal</b></font></p>     <p align="left"><font face="Verdana" size="4"><b>Nutritional management of inflammatory bowel disease</b></font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana" size="2"><b>C. Pérez Tárrago<sup>1</sup>, A. Puebla Maestu<sup>2</sup> y A. Miján de la Torre<sup>3</sup></b></p>     <p><font face="Verdana" size="2"><sup>1</sup>Servicio de Medicina Interna. Complejo Asistencial de Burgos.    <BR><sup>2</sup>Servicio Aparato Digestivo. Complejo Asistencial de Burgos.    <br><sup>3</sup>Nutrición Clínica. S. Medicina Interna. Complejo Asistencial de Burgos. Nutrición Humana y Dietética. Facultad de Medicina. Universidad de Valladolid. España.</font></p>     ]]></body>
<body><![CDATA[<p><a href="#back">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">Los pacientes con enfermedad inflamatoria intestinal presentan mayor riesgo de malnutrici&oacute;n. Por este motivo es muy frecuente que se precise un adecuado soporte nutricional. En estos pacientes se debe utilizar la nutrici&oacute;n enteral a menos que existan contraindicaciones. El soporte nutricional como tratamiento primario no est&aacute; indicado en adultos (al haberse demostrado una mayor eficacia del tratamiento esteroideo) salvo en caso de intolerancia o falta de respuesta al tratamiento m&eacute;dico. Por el contrario, la nutrici&oacute;n enteral se considera el tratamiento de primera l&iacute;nea en ni&ntilde;os. No existe un claro beneficio con el uso de f&oacute;rmulas espec&iacute;ficas (grasa modificada, glutamina...) por lo que no se aconseja su uso rutinario. A pesar de los grandes avances t&eacute;cnicos y cient&iacute;ficos existen a&uacute;n numerosos campos en los que ampliar conocimientos; algunos de los mismos se esbozan en la presente publicaci&oacute;n.</font></p>     <p><font face="Verdana" size="2"><B>Palabras clave:</B> Enfermedad de Crohn. Colitis ulcerosa. Revisi&oacute;n. Nutrici&oacute;n artificial. Nutrici&oacute;n enteral. Nutrici&oacute;n parenteral. Enfermedad inflamatoria intestinal.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><B>ABSTRACT</B></font></p>     <p><font face="Verdana" size="2">Patients with inflammatory bowel disease present higher risk for hyponutrition. For this reason, an adequate nutritional support is frequently needed. In these patients, enteral nutrition should be used unless there exist contraindications. Nutritional support as the primary therapy is no indicated in adults (since steroidal therapy has shown to be more effective) but in the case of intolerance or lack of response to medical treatment. By contrast, enteral nutrition is considered a first line therapy in children. There is no clear benefit with the use of specific formulas (modified fat, glutamine...), so that their routine use is not recommended. In spite of the great technical and scientific advances, there are still many fields in which knowledge should be broaden; some of them are pointed out in this publication.</font></p>     <p><font face="Verdana" size="2"><B>Key words:</B> Crohn's disease. Ulcerative colitis. Review. Artificial nutrition. Enteral nutrition. Parenteral nutrition. Inflammatory bowel disease.</font></p> <hr size="1">     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana"><B>Conceptos generales</B></font></p>     <p><font face="Verdana" size="2"><i>Definici&oacute;n</i></font></p>     <p><font face="Verdana" size="2">La enfermedad inflamatoria intestinal (EIIC) es un grupo de enfermedades que cursan con inflamaci&oacute;n del tubo digestivo pero, en la pr&aacute;ctica cl&iacute;nica, se hace referencia a la colitis ulcerosa, a la enfermedad de Crohn y a la colitis indeterminada. Es importante realizar la distinci&oacute;n cl&iacute;nica entre colitis ulcerosa y enfermedad de Crohn, ya que la evidencia demuestra que el curso cl&iacute;nico, su pron&oacute;stico, la respuesta al tratamiento m&eacute;dico, la necesidad de tratamiento quir&uacute;rgico y la tasa de recurrencia postquir&uacute;rgica difieren significativamente en las dos entidades<sup>1,2</sup>.</font></p>     <p><font face="Verdana" size="2">En la <i>colitis ulcerosa</i> el proceso inflamatorio afecta exclusivamente al colon. La inflamaci&oacute;n est&aacute; confinada en la mucosa y submucosa (<a target="_blank" href="/img/revistas/nh/v23n5/revision_f1.gif">fig. 1</a>), se inicia en el recto y, de forma continua y sim&eacute;trica, se extiende proximalmente a otros segmentos del colon. En la <i>enfermedad de Crohn</i>, cualquier parte del tubo digestivo puede estar afectada, desde la boca hasta el ano, de forma focal, segmentaria, y discontinua, si bien las localizaciones m&aacute;s habituales son el &iacute;leon terminal y diversos segmentos del colon. En esta enfermedad, el proceso inflamatorio puede abarcar todo el espesor de la pared del tubo digestivo (<a target="_blank" href="/img/revistas/nh/v23n5/revision_f2.gif">fig. 2</a>), desde la mucosa a la serosa, con la consiguiente aparici&oacute;n de fisuras, f&iacute;stulas o abscesos. El t&eacute;rmino de <i>colitis indeterminada</i> fue introducido para describir las piezas de colectom&iacute;a que presentaban caracter&iacute;sticas histol&oacute;gicas que no son definitorias de colitis ulcerosa ni enfermedad de Crohn<sup>3</sup>. En un reciente estudio prospectivo de base poblacional se ha podido observar c&oacute;mo a los 2 a&ntilde;os del diagn&oacute;stico de colitis indeterminada, un 33% de ellos eran diagnosticados de colitis ulcerosa y un 17% de enfermedad de Crohn<sup>4</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Etiopatogenia</i></font></p>     <p><font face="Verdana" size="2">La etiopatogenia de la EIIC contin&uacute;a siendo desconocida; aunque se han realizado importantes avances. Todas las evidencias actuales indican que la disregulaci&oacute;n, gen&eacute;ticamente determinada, de la respuesta inmune del hu&eacute;sped frente a la flora bacteriana residente y otros ant&iacute;genos luminales, jugar&iacute;a un papel clave en la patogenia del da&ntilde;o tisular en la enfermedad inflamatoria intestinal<sup>5,6</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Diagn&oacute;stico</i></font></p>     <p><font face="Verdana" size="2">La enfermedad inflamatoria cr&oacute;nica intestinal se sospecha ante la presencia de algunos de los siguientes signos y/o s&iacute;ntomas con car&aacute;cter recurrente: rectorragia, dolor abdominal, distensi&oacute;n, retortij&oacute;n, episodios de diarrea, tenesmo o urgencia defecatoria, presencia de lesiones anogenitales y de determinadas manifestaciones extraintestinales como p&eacute;rdida de peso, retraso del crecimiento en ni&ntilde;os, aftas y ulceraciones en la boca, lesiones d&eacute;rmicas, oculares, articulares y hep&aacute;ticas<sup>7</sup>.</font></p>     <p><font face="Verdana" size="2">El diagn&oacute;stico de colitis ulcerosa o enfermedad de Crohn se realizar&aacute; seg&uacute;n la definici&oacute;n de Lennard-Jones, que incluye cuatro grupos de criterios diagn&oacute;sticos: cl&iacute;nicos, radiol&oacute;gicos, endosc&oacute;picos y anatomopatol&oacute;gicos<sup>8</sup>.</font></p>     <p><font face="Verdana" size="2">La valoraci&oacute;n de la gravedad cl&iacute;nica en la colitis ulcerosa se realiza mediante el &iacute;ndice de Truelove-Witts, que permite definir la severidad del brote y establecer la pauta de tratamiento m&aacute;s adecuada. No obstante, en la cl&iacute;nica diaria para no depender de par&aacute;metros bioqu&iacute;micos se puede utilizar el &iacute;ndice de severidad cl&iacute;nico<sup>9</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En la enfermedad de Crohn existen varios &iacute;ndices para evaluar la gravedad de la enfermedad. Entre estos los m&aacute;s habitualmente utilizados son el &iacute;ndice de Best y el &iacute;ndice de actividad de la enfermedad de Crohn (CDAI). La valoraci&oacute;n cl&iacute;nica de la enfermedad perianal se valora con el PDAI (Perianal Disease Activity Index)<sup>10</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Epidemiolog&iacute;a</i></font></p>     <p><font face="Verdana" size="2">En cuanto a la epidemiolog&iacute;a, la incidencia de colitis ulcerosa y enfermedad de Crohn es alta en los pa&iacute;ses industrializados y est&aacute; aumentando en los pa&iacute;ses en desarrollo. La mayor&iacute;a de los enfermos inicia su enfermedad entre los 15 y los 40 a&ntilde;os, con un segundo pico para la colitis ulcerosa entre los 55-65 a&ntilde;os<sup>11</sup>.</font></p>     <p><font face="Verdana" size="2">En Espa&ntilde;a la incidencia de colitis ulcerosa es de 8 por 100.000 habitantes/a&ntilde;o y la de la enfermedad de Crohn de 5,5 por 100.000 habitantes/a&ntilde;o<sup>12</sup>. La prevalencia presenta variaciones en los distintos grupos &eacute;tnicos, siendo mayor en los cauc&aacute;sicos y especialmente entre los jud&iacute;os Ashkenazi centroeuropeos<sup>13</sup>.</font></p>     <p><font face="Verdana" size="2">La relaci&oacute;n familiar est&aacute; claramente demostrada, siendo la historia familiar el principal factor de riesgo conocido para el desarrollo de estas enfermedades. El modelo de herencia es complejo, no mendeliano, y es el resultado de una compleja interacci&oacute;n entre factores gen&eacute;ticos (se han implicado al menos diez genes; el m&aacute;s estudiado es el CARD15/NOD2) y ambientales<sup>14</sup>.</font></p>     <p><font face="Verdana" size="2">Se han descrito numerosos factores medioambientales que parecen contribuir a la aparici&oacute;n de esta enfermedad (dieta, estr&eacute;s, flora ent&eacute;rica, apendicectom&iacute;a...). Los datos no son concluyentes en la mayor&iacute;a de los estudios a excepci&oacute;n del tabaco (papel preventivo en la colitis ulcerosa e influencia negativa en la enfermedad de Crohn), y ciertos f&aacute;rmacos como los anticonceptivos orales y sobre todo los AINEs<sup>15-17</sup>. Se ha observado adem&aacute;s una mayor incidencia de otras enfermedades autoinmunes en estos pacientes.</font></p>     <p>&nbsp;</font></p>     <p><font face="Verdana"><b>Malnutrici&oacute;n en la enfermedad inflamatoria intestinal</b></font></p>     <p><font face="Verdana" size="2"><i>Introducci&oacute;n</i></font></p>     <p><font face="Verdana" size="2">La malnutrici&oacute;n es una caracter&iacute;stica com&uacute;n de la enfermedad inflamatoria cr&oacute;nica intestinal. Las deficiencias nutricionales o la incapacidad para mantener el peso ideal ocurren en 50-70% de pacientes con enfermedad de Crohn y en 18-62% de pacientes con colitis ulcerosa<sup>18</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La sociedad Americana de Nutrici&oacute;n Parenteral y Enteral (ASPEN) considera que los pacientes con enfermedad inflamatoria intestinal est&aacute;n en riesgo de desnutrici&oacute;n, por los que se deber&iacute;a realizar un cribado nutricional a todos ellos para identificar a los pacientes que requieran una valoraci&oacute;n nutricional formal que permita desarrollar un tratamiento nutricional adecuado (<i>grado de recomendaci&oacute;n B</i>). Dicho estudio habitualmente incluye: control del peso corporal, determinaci&oacute;n de los par&aacute;metros nutricionales antropom&eacute;tricos y de las prote&iacute;nas de s&iacute;ntesis visceral, determinaci&oacute;n de vitaminas y minerales y en algunos casos la realizaci&oacute;n de una densitometr&iacute;a &oacute;sea<sup>19</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Factores que influyen</i></font></p>     <p><font face="Verdana" size="2">Existen varios factores que influyen en la patog&eacute;nesis de la malnutrici&oacute;n en la enfermedad inflamatoria cr&oacute;nica intestinal: reducci&oacute;n de la ingesta (anorexia, ayuno "terap&eacute;utico", obstrucci&oacute;n intestinal, dispepsia inducida por f&aacute;rmacos), malabsorci&oacute;n de nutrientes (diarrea, inflamaci&oacute;n de la mucosa, resecciones intestinales, sobrecrecimiento bacteriano...), aumento del metabolismo (inflamaci&oacute;n y ulceraci&oacute;n de la mucosa, complicaciones s&eacute;pticas, tratamiento con corticoides) y p&eacute;rdida enteral de prote&iacute;nas (inflamaci&oacute;n/ulceraci&oacute;n de la mucosa, f&iacute;stulas...)<sup>20</sup>.</font></font></p>     <p><font face="Verdana" size="2"><i>Efectos de la malnutrici&oacute;n</i></font></p>     <p><font face="Verdana" size="2">La alteraci&oacute;n del estado nutricional produce graves alteraciones sobre el estado general, como adelgazamiento, retraso del crecimiento y desarrollo puberal en ni&ntilde;os y adolescentes, osteoporosis con disminuci&oacute;n de la densidad &oacute;sea, atrofia de las vellosidades intestinales, d&eacute;ficit en el transporte plasm&aacute;tico de f&aacute;rmacos, inmunosupresi&oacute;n, dificultad para la reparaci&oacute;n tisular, hiperhomocisteinemia y aumento del riesgo tromb&oacute;tico (complejo B), hipogonadismo, alopecia, rash cut&aacute;neo (d&eacute;ficit de zinc), anemia, incremento de la morbi-mortalidad, per&iacute;odos de remisi&oacute;n m&aacute;s cortos y aumento del riesgo quir&uacute;rgico. Por todo &eacute;sto es de gran importancia restaurar un estado nutricional adecuado<sup>21</sup>.</font></p>     <p><font face="Verdana" size="2">Respecto a la gravedad de la malnutrici&oacute;n, depende principalmente de la enfermedad de base, de la localizaci&oacute;n y extensi&oacute;n de la afectaci&oacute;n intestinal, de la severidad del brote, de las complicaciones asociadas y de la terapia farmacol&oacute;gica.</font></p>     <p><font face="Verdana" size="2"><i>D&eacute;ficits nutricionales</i></font></p>     <p><font face="Verdana" size="2">En pacientes con EIIC podemos encontrar gran variedad de d&eacute;ficits nutricionales:</font></p>     <p><font face="Verdana" size="2">- Vitamina A. Es conocida actualmente la importancia de suplementar la dieta deficitaria con vitamina A por el mayor riesgo que existe de fracturas &oacute;seas.</font></p>     <p><font face="Verdana" size="2">- Vitaminas antioxidantes. Debido al estr&eacute;s oxidativo que existe en los pacientes con enfermedad de Crohn, se produce disminuci&oacute;n de las concentraciones plasm&aacute;ticas de vitaminas antioxidantes (&aacute;cido asc&oacute;rbico, alfa y beta caroteno, licopenos). La suplementaci&oacute;n con Vitamina E y C puede reducir el estr&eacute;s oxidativo<sup>22</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">- Vitamina B<sub>12</sub>. En el 20-60% de los pacientes con enfermedad de Crohn y afectaci&oacute;n o resecci&oacute;n del &iacute;leon terminal existe deficiencia de vitamina B<sub>12</sub><sup> 23</sup>.</font></p>     <p><font face="Verdana" size="2">- Cobre. Existe un incremento de las p&eacute;rdidas en pacientes con diarrea profusa, f&iacute;stulas u ostom&iacute;as<sup>24</sup>.</font></p>     <p><font face="Verdana" size="2">- Calcio. Aproximadamente en el 13% de pacientes con enfermedad de Crohn existe malabsorci&oacute;n de calcio<sup>25</sup>.</font></p>     <p><font face="Verdana" size="2">- Vitaminas liposolubles (vitaminas A, D, E K). Su d&eacute;ficit se produce por deficiencia de &aacute;cidos biliares debido a ile&iacute;tis terminal, tras resecci&oacute;n intestinal o por el uso de f&aacute;rmacos como la colestiramina. Tambi&eacute;n contribuye la malabsorci&oacute;n de grasas. La vitamina D es la vitamina liposoluble que se afecta con mayor frecuencia en los pacientes con EIIC y su deficiencia contribuye al desarrollo de osteoporosis<sup>26</sup>. Algunos estudios han observado niveles descendidos de vitamina D en el 61,6% de los pacientes<sup>27</sup>.</font></p>     <p><font face="Verdana" size="2">- &Aacute;cido f&oacute;lico. Su d&eacute;ficit se observa en aproximadamente el 40% de pacientes con enfermedad de Crohn y el 60% de pacientes con colitis ulcerosa<sup>23</sup>. El tratamiento con sulfasalazina y metotrexato pueden incrementar la deficiencia de folato.</font></p>     <p><font face="Verdana" size="2"><font face="Verdana" size="2">- Homociste&iacute;na. Los niveles de homociste&iacute;na est&aacute;n elevados en adultos con enfermedad de Crohn y en ni&ntilde;os con enfermedad inflamatoria intestinal<sup>28,29</sup>.</font></p>     <p><font face="Verdana" size="2">- Hierro. Alrededor de 66% de pacientes con colitis ulcerosa y 25-40% de pacientes con enfermedad de Crohn presentan deficiencia de hierro<sup>30</sup>. Esto produce un impacto negativo en la calidad de vida y puede producir anomal&iacute;as importantes en ni&ntilde;os y adolescentes<sup>31</sup>. El d&eacute;ficit de hierro en la enfermedad inflamatoria intestinal es causado por p&eacute;rdidas cr&oacute;nicas de sangre; por la supresi&oacute;n de la producci&oacute;n de eritropoyetina y la alteraci&oacute;n del metabolismo del hierro por citoquinas proinflamatorias, metabolitos reactivos y &oacute;xido n&iacute;trico<sup>32</sup>.</font></p>     <p><font face="Verdana" size="2">- Vitamina K. Es un cofactor en la carboxilaci&oacute;n de osteocalcina, prote&iacute;na fundamental para unir el calcio al hueso. La vitamina K participa en la carboxilaci&oacute;n de los residuos del &aacute;cido glut&aacute;mico en las proteinas-GLA, como la osteocalcina. Su deficiencia puede ocasionar alteraciones en el metabolismo &oacute;seo y contribuir al desarrollo de osteoporosis en los pacientes con enfermedad inflamatoria intestinal<sup>33</sup>.</font></p>     <p><font face="Verdana" size="2">- Lipoprote&iacute;nas. Son transportadoras de grasas y vitaminas liposolubles en la circulaci&oacute;n y contribuyen al mantenimiento de la membrana celular. El colesterol LDL y lipoprote&iacute;nas A-I y B est&aacute;n disminuidos en la enfermedad de Crohn. Estos cambios no est&aacute;n en relaci&oacute;n con la actividad de la enfermedad<sup>34</sup>.</font></p>     <p><font face="Verdana" size="2"><font face="Verdana" size="2">- Niacina. La pelagra (d&eacute;ficit de niacina) se ha descrito en algunos casos excepcionales de pacientes con enfermedad de Crohn<sup>35</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">- Prote&iacute;nas. El d&eacute;ficit proteico se produce por disminuci&oacute;n de la ingesta, p&eacute;rdida enteral de prote&iacute;nas y aumento del catabolismo. La medici&oacute;n de alfa 1 antitripsina fecal, que indica p&eacute;rdidas prote&iacute;cas intestinales, est&aacute; incrementada en estos pacientes. La depleci&oacute;n prote&iacute;ca se asocia a mayor mortalidad postquir&uacute;rgica<sup>21</sup>.</font></p>     <p><font face="Verdana" size="2">- Magnesio. Puede estar bajo por la disminuci&oacute;n de la ingesta oral, malabsorci&oacute;n y p&eacute;rdidas intestinales. Su d&eacute;ficit puede contribuir a producir osteopenia<sup>36</sup>.</font></p>     <p><font face="Verdana" size="2">- Selenio. Se ha descrito su deficiencia en pacientes con enfermedad de Crohn con resecci&oacute;n intestinal&gt; 200 cm y en aquellos que reciben nutrici&oacute;n enteral<sup>37</sup>.</font></p>     <p><font face="Verdana" size="2">- Zinc. Al menos el 40-50% de pacientes con enfermedad de Crohn tienen concentraciones bajas de Zinc en sangre. Pero los niveles s&eacute;ricos se correlacionan poco con el pull total, por lo que la deficiencia de zinc es probablemente menos com&uacute;n. El d&eacute;ficit de zinc se refleja por el descenso s&eacute;rico de la concentraci&oacute;n de fosfatasa alcalina, dado que &eacute;sta es una metaloenzima del zinc.</font></p>     <p><font face="Verdana" size="2"><i>Osteoporosis y EIIC</i></font></p>     <p><font face="Verdana" size="2">La osteoporosis es una manifestaci&oacute;n extraintestinal de la EII en cuyo desarrollo influyen diversos factores: la inactividad, el tratamiento corticoideo prolongado, m&uacute;ltiples d&eacute;ficits nutricionales que son frecuentes en estos pacientes, ciertos determinantes gen&eacute;ticos que comienzan a conocerse y la propia enfermedad en s&iacute;, en la que el hueso constituye un &oacute;rgano diana de la respuesta inflamatoria sist&eacute;mica<sup>38,39</sup>. Como mecanismos patog&eacute;nicos de este proceso en el seno de la enfermedad inflamatoria intestinal se han demostrado tanto la supresi&oacute;n de la formaci&oacute;n de hueso, como el incremento de la resorci&oacute;n del mismo<sup>40,41</sup>.</font></p>     <p><font face="Verdana" size="2">Los bifosfonatos son f&aacute;rmacos an&aacute;logos del pirofosfato inorg&aacute;nico capaces de inhibir la resorci&oacute;n &oacute;sea. Su efecto beneficioso se ha demostrado en la reducci&oacute;n de la incidencia de fracturas tanto en mujeres postmenop&aacute;usicas como en varones, as&iacute; como en la prevenci&oacute;n y tratamiento de la osteoporosis esteroidea<sup>42,43</sup>. Se ha publicado un ensayo randomizado controlado en 32 pacientes con enfermedad de Crohn y osteopenia que observa que el tratamiento con 10 mg diarios de alendronato incrementa de forma significativa la densidad mineral &oacute;sea<sup>44</sup>. Otro estudio randomizado de 74 pacientes con enfermedad de Crohn y baja densidad &oacute;sea compar&oacute; el efecto que ten&iacute;an 500 mg de Calcio y 400 UI de vitamina D diarios solos o asociados a infusiones de 30 mg pamidronato intravenoso 3 &oacute; 4 veces al mes. Se observ&oacute; que, aunque con ambos tratamientos aumentaba la densidad mineral&oacute;sea, el tratamiento combinado produc&iacute;a un aumento significativo<sup>45</sup>.</font></p>     <p><font face="Verdana" size="2"><i>¿Cu&aacute;ndo y como debemos utilizar el soporte nutricional en los pacientes con EIIC?</i></font></p>     <p><font face="Verdana" size="2">El objetivo de la estrategia nutricional en los pacientes con EIIC es evitar la aparici&oacute;n de la malnutrici&oacute;n y sus consecuencias negativas en la evoluci&oacute;n cl&iacute;nica de la enfermedad. El soporte nutricional artificial es esencial para el cuidado de pacientes con enfermedad inflamatoria cr&oacute;nica intestinal, especialmente aquellos con malnutrici&oacute;n, intolerancia al tratamiento m&eacute;dico y en los ni&ntilde;os, en los que la malnutrici&oacute;n puede producir un retraso del crecimiento<sup>46</sup>.</font></p>     <p><font face="Verdana" size="2">La nutrici&oacute;n enteral, ya sea suplementando la dieta normal (nutrici&oacute;n enteral parcial) o en forma de nutrici&oacute;n enteral total, es normalmente la t&eacute;cnica de elecci&oacute;n. La nutrici&oacute;n enteral puede administrarse por v&iacute;a oral, a trav&eacute;s de sonda de alimentaci&oacute;n u otro acceso digestivo (gastrostom&iacute;a, yeyunostom&iacute;a). La nutrici&oacute;n parenteral est&aacute; indicada s&oacute;lo en caso de no ser posible controlar las necesidades energ&eacute;tico-prote&iacute;cas mediante nutrici&oacute;n enteral o bien en caso de contraindicaci&oacute;n de la misma.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Las contraindicaciones de la nutrici&oacute;n enteral en la enfermedad de Crohn son: la existencia de f&iacute;stulas intestinales de alto flujo, &iacute;leo paral&iacute;tico, obstrucci&oacute;n intestinal, sepsis intraabdominal y hemorragia digestiva grave.</font></p>     <p>Las contraindicaciones de la nutrici&oacute;n enteral en la colitis ulcerosa son: megacolon t&oacute;xico, &iacute;leo paral&iacute;tico, hemorragia digestiva, obstrucci&oacute;n intestinal y perforaci&oacute;n intestinal<sup>47</sup>.</font></p>     <p>&nbsp;</font></p>     <p><font face="Verdana"><b>Papel de la nutrición como terapia primaria de la EIIC</b></font></p>     <p><font face="Verdana" size="2">Se desconoce el mecanismo exacto de acci&oacute;n de la nutrici&oacute;n enteral mediante el cual puede provocar un efecto terap&eacute;utico primario en la enfermedad de Crohn activa. Se han barajado una serie de hip&oacute;tesis: descanso intestinal con alteraci&oacute;n de la flora intestinal y eliminaci&oacute;n o reducci&oacute;n de la captaci&oacute;n de ant&iacute;genos alimentarios, aporte de micronutrientes, mejor&iacute;a del estado nutricional y/o aumento en la absorci&oacute;n de sustratos as&iacute; como la reducci&oacute;n de p&eacute;rdidas intestinales de prote&iacute;nas<sup>48</sup>. De acuerdo con otras hip&oacute;tesis una mayor exposici&oacute;n a micropart&iacute;culas en la dieta occidental (part&iacute;culas inorg&aacute;nicas de tama&ntilde;o bacteriano de origen inflamatorio; consisten normalmente en &oacute;xidos de titanio, aluminio y silicona que ingerimos en aditivos como colorantes, antiaglutinantes...) podr&iacute;a potenciar la inflamaci&oacute;n mucosa<sup>49</sup>. Asimismo, ciertas caracter&iacute;sticas de la dieta (alta en polioles y carbohidratos de cadena corta) parecen aumentar la permeabilidad intestinal, lo cual se cree un factor predisponente para el desarrollo de la enfermedad de Crohn<sup>50</sup>. Por todo ello, se ha valorado la posibilidad de que parte de la eficacia de la nutrici&oacute;n enteral est&eacute; en relaci&oacute;n con su bajo contenido en micropart&iacute;culas y ciertos h&aacute;bitos diet&eacute;ticos.</font></p>     <p><font face="Verdana" size="2"><i>Indicaciones en adultos</i></font></p>     <p><font face="Verdana" size="2">Enfermedad de Crohn</font></p>     <p><font face="Verdana" size="2">- <i>Fase activa:</i> En los adultos no est&aacute; indicado el tratamiento con nutrici&oacute;n enteral de forma aislada en la fase aguda pero s&iacute; asociada a los corticoides para prevenir y tratar la malnutrici&oacute;n, y en caso de fracaso o contraindicaci&oacute;n de los tratamientos m&eacute;dicos<sup>51,52</sup>.</font></p>     <p><font face="Verdana" size="2">Los distintos meta-an&aacute;lisis que comparan la nutrici&oacute;n enteral con los corticosteroides han demostrado un mayor beneficio terap&eacute;utico a favor de &eacute;stos<sup>53,54</sup>. No existen ensayos controlados de nutrici&oacute;n enteral frente a placebo ni otros tratamientos como mesalamina o corticoides t&oacute;picos aunque los datos sugieren que, aunque su eficacia no es igual al tratamiento con corticoides, s&iacute; existe un beneficio terap&eacute;utico<sup>53</sup>.</font></p>     <p><font face="Verdana" size="2">Por otro lado, con el uso de la nutrici&oacute;n enteral se ha demostrado un efecto directo sobre la inflamaci&oacute;n intestinal objetiv&aacute;ndose una reducci&oacute;n de la p&eacute;rdida proteica intestinal, disminuci&oacute;n de la permeabilidad intestinal y de la secreci&oacute;n fecal de leucocitos marcados con indio<sup>55</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Existen varios estudios en los que se compara nutrici&oacute;n enteral total, parenteral total y parenteral asociada a alimentaci&oacute;n. Los resultados son similares con una nutrici&oacute;n parenteral parcial m&aacute;s una dieta oral, una dieta elemental administrada por sonda nasog&aacute;strica o bien nutrici&oacute;n parenteral total y reposo intestinal completo<sup>56,57</sup>. Un estudio reciente compara de forma aleatoria un grupo de ni&ntilde;os con enfermedad de Crohn activa en 2 grupos: nutrici&oacute;n enteral aislada y nutrici&oacute;n mixta (50% enteral y 50% alimentaci&oacute;n oral normal) consiguiendo mejores resultado en el primer grupo (posiblemente por la existencia de menores p&eacute;rdidas intestinales)<sup>58</sup>. Se necesitan m&aacute;s estudios para investigar el efecto de la nutrici&oacute;n enteral parcial.</font></p>     <p><font face="Verdana" size="2">Desde el punto de vista del beneficio nutricional no se han observado diferencias en cuanto al uso de nutrici&oacute;n enteral o parenteral existiendo una mayor incidencia de complicaciones con la segunda por lo que habitualmente utilizaremos la nutrici&oacute;n enteral (a trav&eacute;s de f&oacute;rmulas administradas como suplementos de la dieta o como nutrici&oacute;n &uacute;nica o total a trav&eacute;s de sondas enterales), a menos que existan contraindicaciones. Se asociar&aacute; la nutrici&oacute;n parenteral si no cubrimos los requerimientos energ&eacute;ticos. En un estudio reciente la nutrici&oacute;n enteral se ha mostrado superior a la parenteral en los pacientes con enfermedad inflamatoria intestinal, pancreatitis aguda, quemados y s&eacute;pticos con un nivel A de evidencia<sup>59</sup>.</font></p>     <p><font face="Verdana" size="2">Algunos estudios concluyen que la enfermedad de Crohn col&oacute;nica sin afectaci&oacute;n ileal responde peor al tratamiento con nutrici&oacute;n enteral que la ileocolitis o enfermedad aislada de intestino delgado<sup>60</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Fase de mantenimiento:</i> La mayor&iacute;a de los pacientes en remisi&oacute;n tienen un estado nutricional aparentemente normal. Aunque varios estudios concluyen que la nutrici&oacute;n enteral suplementaria continuada despu&eacute;s de la fase activa prolonga el intervalo libre de reca&iacute;da de la enfermedad<sup>61</sup>, se aconseja utilizar la nutrici&oacute;n enteral (suplementos nutricionales orales o a trav&eacute;s de sonda nasog&aacute;strica) o suplementos (vitaminas..) s&oacute;lo si existen d&eacute;ficits nutricionales. En remisiones cl&iacute;nicas largas (&gt; 1 a&ntilde;o) y en ausencia de d&eacute;ficits nutricionales, no se han demostrado beneficios en el uso de la nutrici&oacute;n enteral o suplementos (vitaminas...). La duraci&oacute;n de la remisi&oacute;n inducida por la nutrici&oacute;n enteral es comparable a la conseguida tras el tratamiento con corticoides en ni&ntilde;os y adultos. En el caso de inflamaci&oacute;n persistente (p. ej., corticodependientes) los suplementos orales parecen ser beneficiosos<sup>52</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Nutrici&oacute;n perioperatoria:</i> En cuanto a la nutrici&oacute;n perioperatoria varios estudios han valorado su papel en la enfermedad de Crohn, sin observarse una mejor&iacute;a en la morbilidad ni en la longitud del intestino resecado<sup>62</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Colitis ulcerosa</i></font></p>     <p><font face="Verdana" size="2">La influencia del tratamiento nutricional sobre la actividad inflamatoria en la colitis ulcerosa no ha sido demostrada<sup>63,64</sup>. No obstante, se aconseja un soporte nutricional especializado en los pacientes con brotes graves de colitis ulcerosa, sobre todo si se prev&eacute; la necesidad de tratamiento quir&uacute;rgico a corto plazo o existe malnutrici&oacute;n energ&eacute;tico-proteica asociada. Existe un estudio controlado en el que se comparan la nutrici&oacute;n enteral y parenteral como &uacute;nico soporte nutricional en pacientes con un brote grave de colitis ulcerosa tratados con corticoides a dosis de 1 mg/kg. En este estudio no se observan diferencias en cuanto a la evoluci&oacute;n cl&iacute;nica pero el n&uacute;mero de infecciones en el postoperatorio y de complicaciones relacionadas con el soporte nutricional fue significativamente m&aacute;s frecuente con la nutrici&oacute;n parenteral total. Se considera la nutrici&oacute;n enteral como la modalidad de elecci&oacute;n en el soporte nutricional de la colitis ulcerosa grave a menos que existan contraindicaciones<sup>64</sup>. Los datos conocidos en cuanto a los beneficios de f&oacute;rmulas espec&iacute;ficas (glutamina,...) son, as&iacute; mismo, contradictorios<sup>65,66</sup>.Tampoco hay datos claros en cuanto al efecto de estas f&oacute;rmulas y terapia nutricional para el mantenimiento de la remisi&oacute;n por lo que la nutrici&oacute;n enteral no se recomienda para ello<sup>52</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Indicaciones en poblaci&oacute;n infantil</i></font></p>     <p><font face="Verdana" size="2">El 10-15% de los casos de enfermedad de Crohn se producen en ni&ntilde;os. En estos pacientes la NE est&aacute; considerada como terapia de primera l&iacute;nea en la enfermedad de Crohn activa. Como tratamiento &uacute;nico o asociada a otros f&aacute;rmacos como la mesalazina es claramente efectiva consiguiendo la remisi&oacute;n de la enfermedad en hasta un 80% de los casos y con ello una mejor&iacute;a en el crecimiento, en el estado nutricional y en la calidad de vida, evitando los efectos secundarios de la corticoterapia cr&oacute;nica<sup>67,68</sup>. En varios metaan&aacute;lisis no se han observado diferencias en el tratamiento con nutrici&oacute;n enteral o con corticoides en estos pacientes<sup>53,69</sup>. Se ha objetivado un efecto temprano de la nutrici&oacute;n enteral sobre la inflamaci&oacute;n sist&eacute;mica y sobre el sistema factor de crecimiento insulinoide que precede a cualquier cambio en los par&aacute;metros nutricionales con mejor&iacute;a en los par&aacute;metros inflamatorios, el &iacute;ndice de actividad de la enfermedad de Crohn pedi&aacute;trica, IGF-1 y la PCR<sup>70</sup>. Por el contrario, en la colitis ulcerosa se precisa habitualmente tratamiento m&eacute;dico antiinflamatorio a&ntilde;adido al tratamiento nutricional<sup>71</sup>.</font></p>     <p><font face="Verdana" size="2">La nutrici&oacute;n enteral debe administrarse entre 6 y 8 semanas como tratamiento &uacute;nico sin ingerir otros alimentos salvo l&iacute;quidos. La cantidad requerida va a depender del d&eacute;ficit nutricional y de la ingesta de nutrientes recomendada. Si no es bien tolerada (palatabilidad, cantidad...) podemos empezar administr&aacute;ndola mediante sonda naso-g&aacute;strica, normalmente con un aumento gradual de la cantidad y vigilando la aparici&oacute;n de un posible s&iacute;ndrome de realimentaci&oacute;n. Al final del per&iacute;odo del nutrici&oacute;n enteral reintroduciremos los alimentos de forma progresiva y lentamente (continuando con soporte nutricional para conseguir el aporte cal&oacute;rico requerido)<sup>72</sup>. Algunos estudios han observado un efecto beneficioso de la nutrici&oacute;n enteral intermitente aunque es controvertido y se debe valorar en funci&oacute;n del estado nutricional del paciente<sup>73,74</sup>. No hay estudios que realicen un seguimiento a largo plazo en ni&ntilde;os aunque parece que, al igual que en los adultos, el &iacute;ndice de recidiva oscila entre 50 y 90% a los 12 meses<sup>75</sup>.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</font></p>     <p><font face="Verdana"><b>Nutrientes espec&iacute;ficos en la EIIC</b></font></p>     <p><font face="Verdana" size="2">Revisemos a continuaci&oacute;n algunos sustratos y nutrientes empleados en la EIIC.</font></p>     <p><font face="Verdana" size="2"><i>Prote&iacute;nas</i>: Los datos de los meta-an&aacute;lisis disponibles no confirman la ventaja de las f&oacute;rmulas elementales con amino&aacute;cidos al compararse con formulaciones polim&eacute;ricas. Las dietas con prote&iacute;na entera son, en general, mejor toleradas, por lo que son las recomendadas habitualmente. Las dietas a base de amino&aacute;cidos o p&eacute;ptidos son hiperosmolares, lo cual puede limitar la cantidad a administrar sin originar diarrea, con lo que el aporte nitrogenado puede ser insuficiente. Estas dietas s&oacute;lo est&aacute;n indicadas si la funci&oacute;n intestinal est&aacute; muy comprometida (enfermedad de Crohn muy extensa o con resecciones amplias) o si existe mala tolerancia a la dieta con prote&iacute;na entera<sup>51,54,76-78</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Grasas</i>: La influencia de las grasas en la eficacia de la f&oacute;rmula no est&aacute; bien definida y los resultados observados en distintos estudios son, incluso, contradictorios. Parece que puede conseguirse un peque&ntilde;o beneficio si se reduce el contenido de grasa total o de &aacute;cidos grasos poliinsaturados n-6 (ejemplo: aceites de semillas como girasol, ma&iacute;z y c&aacute;rtamo), ya que &eacute;stos pueden ser predecesores de eicosanoides y citocinas proinflamatorias. En un ensayo europeo randomizado doble ciego se llega a la conclusi&oacute;n de que la composici&oacute;n de la grasa de la dieta podr&iacute;a explicar el efecto terap&eacute;utico primario de la nutrici&oacute;n enteral como tratamiento en el Crohn. Para ello comparan 62 pacientes con enfermedad de Crohn activa y los dividen de forma aleatoria en tres grupos: el primero recibe una dieta enteral con 35g de l&iacute;pidos por 1.000 kcal, alto en oleico (79%) y bajo en linoleico (6,5%), un segundo recibe una dieta similar pero con diferente tipo de grasas, con mayor cantidad de linoleico (45%) y baja en oleico (28%) y un tercero es tratado con prednisona oral a las dosis habituales. Se objetiva una peor respuesta en el primer grupo<sup>79</sup>.</font></p>     <p><font face="Verdana" size="2">Los &aacute;cidos grasos de cadena corta (AGCC) son hidrocarbonos monocarboxilados producidos por la digesti&oacute;n de carbohidratos no reabsorbibles (fibra diet&eacute;tica, almid&oacute;n resistente, fructo-oligosac&aacute;ridos) que alcanzan el colon, por la flora end&oacute;gena bacteriana. Incluyen el acetato, propionato y butirato, siendo, sobre todo este &uacute;ltimo, el principal nutriente de los colonocitos.</font></p>     <p><font face="Verdana" size="2">Los AGCC tienen adem&aacute;s otros m&uacute;ltiples efectos beneficiosos incluidos la estimulaci&oacute;n de la secreci&oacute;n mucosa, el aumento del flujo vascular, la motilidad y la absorci&oacute;n de sodio. Se ha objetivado as&iacute; mismo un efecto citoprotector y antiinflamatorio, reductor de la permeabilidad paracelular e inductor de la respuesta inmune<sup>80</sup>. Existen varios estudios con butirato t&oacute;pico para tratar la inflamaci&oacute;n con resultados contradictorios<sup>81-83</sup>. La mayor&iacute;a de ellos aportan fibra v&iacute;a oral con buenos resultados objetiv&aacute;ndose en algunos casos un aumento del butirato fecal y mejor&iacute;a de los s&iacute;ntomas y signos de la enfermedad<sup>84,85</sup>. Asimismo, en un estudio se investigan los efectos de la fibra en la reservoritis, confirm&aacute;ndose una mejor&iacute;a en la inflamaci&oacute;n<sup>86</sup>. No obstante, no existen suficientes datos que apoyen el uso de dietas enriquecidas con fibra diet&eacute;tica en la enfermedad inflamatoria intestinal activa, moderada o grave.</font></p>     <p><font face="Verdana" size="2"><i>Hidratos de carbono:</i> Respecto de los mismos, las f&oacute;rmulas con lactosa o elevado contenido en sacarosa u otros disac&aacute;ridos pueden producir diarrea por lo que no se aconseja su utilizaci&oacute;n, siendo la fuente de hidratos de carbono en la mayor&iacute;a de las dietas enterales las maltodextrinas o los pol&iacute;meros lineales de glucosa.</font></p>     <p><font face="Verdana" size="2"><i>F&oacute;rmulas enriquecidas con factor transformador del crecimiento-&beta;:</i> El factor transformador del crecimiento-&beta; (TGF-&beta;<sub>2</sub>) es una citoquina presente de forma natural en la leche con actividad inmunomoduladora y"curativa" de la mucosa. Las f&oacute;rmulas enterales enriquecidas con TGF&beta;<sub>2</sub> han mostrado en estudios no controlados una reducci&oacute;n de la inflamaci&oacute;n mucosa, una disminuci&oacute;n de las citoquinas proinflamatorias en el&iacute;leon y colon y un aumento de TGF&beta;<sub>2</sub> m-RNA<sup>87</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Glutamina</i>: La glutamina es la mayor fuente nutritiva para los enterocitos. Los estudios al efecto, han resultado contradictorios. Un estudio, de tama&ntilde;o muestral reducido, ha sugerido que puede ser beneficiosa en el tratamiento del postoperatorio de pacientes con pouchitis pero no serlo en el tratamiento de pacientes con enfermedad de Crohn<sup>88</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Otros muestran un posible beneficio de la glutamina en la NPT en cuanto que puede aumentar las concentraciones plasm&aacute;ticas de Inmunoglobulinas, reduce el da&ntilde;o intestinal, mejora el balance nitrogenado y puede mejorar el curso de la enfermedad<sup>89,90</sup>. Por el contrario, las f&oacute;rmulas enterales enriquecidas con glutamina no han demostrado ventajas respecto a las standard en cuanto al descenso de la actividad inflamatoria ni a la mejor&iacute;a en los par&aacute;metros cl&iacute;nicos ni antropom&eacute;tricos<sup>88,91</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Antioxidantes/micronutrientes:</i> Los radicales libres del ox&iacute;geno ejercen efectos delet&eacute;reos sobre las c&eacute;lulas epiteliales. Varios estudios han puesto de manifiesto menores niveles de antioxidantes y vitaminas en la mucosa intestinal y plasma de pacientes con enfermedad de Crohn<sup>92</sup>. Existen varios estudios controlados en pacientes con enfermedad inflamatoria intestinal cr&oacute;nica suplementados con vitamina C y E en los que se objetiv&oacute; un aumento de los niveles en sangre de estas vitaminas y un descenso del estr&eacute;s oxidativo<sup>93</sup>.</font></p>     <p><font face="Verdana" size="2">En otro estudio en pacientes con Crohn se examin&oacute; la suplementaci&oacute;n con una f&oacute;rmula antioxidante o con&aacute;cidos grasos omega 3. Las concentraciones de vitamina C y E y la actividad super&oacute;xido dismutasa aumentaron despu&eacute;s de los suplementos antioxidantes. Los &aacute;cidos grasos omega 3 disminuyeron de forma significativa la proporci&oacute;n de &aacute;cido araquid&oacute;nico, lo que condujo a la producci&oacute;n de eicosanoides con actividad proinflamatoria atenuada. No se examin&oacute; el efecto sobre la actividad inflamatoria<sup>94</sup>.</font></p>     <p><font face="Verdana" size="2">Otros estudios también han demostrado las ventajas de estos suplementos en disminuir la necesidad de corticoides. Se objetiv&oacute; que el uso de suplementos orales enriquecidos con aceite de pescado, fructooligosac&aacute;ridos, vitamina C, vitamina E y selenio en adultos con brote leve-moderado de colitis ulcerosa consegu&iacute;a una mejor&iacute;a en la respuesta cl&iacute;nica as&iacute; como un descenso en las dosis de corticoides requeridas<sup>95</sup>.</font></p>     <p><font face="Verdana" size="2">Otros micronutrientes que deben ser correctamente evaluados en pacientes con EIIC incluyen el potasio, magnesio, calcio, f&oacute;sforo, vitamina D y zinc, mereciendo estudio ocasionalmente el selenio y el glutati&oacute;n. Asimismo podemos, a veces, observar en estos pacientes un d&eacute;ficit de vitaminas liposolubles (sobre todo si existe una esteatorrea significativa).</font></p>     <p><font face="Verdana" size="2">Por otro lado, los suplementos de antioxidantes, caso de utilizarlos, se deber&iacute;an utilizar combinados. El uso de antioxidantes &uacute;nicos a dosis altas, no es seguro desde el punto de vista bioqu&iacute;mico puesto que todos ellos interact&uacute;an en la cadena de defensa contra los radicales libres. No obstante, se necesitan m&aacute;s estudios en este campo<sup>96</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Fibra y prebi&oacute;ticos</i>: Los prebi&oacute;ticos son carbohidratos no digeribles que estimulan el crecimiento y metabolismo de las bacterias protectoras ent&eacute;ricas end&oacute;genas. Muchos forman parte de la fibra diet&eacute;tica. El t&eacute;rmino fibra incluye un conjunto de sustancias muy variadas que se caracterizan por la imposibilidad de ser digeridas por las enzimas digestivas humanas. Incluyen fructoligosac&aacute;ridos como la inulina, disac&aacute;ridos, polisac&aacute;ridos no almid&oacute;nicos, polisac&aacute;ridos no fermentables derivados del almid&oacute;n como la peptina... Sus efectos beneficiosos se asocian principalmente con la formaci&oacute;n de &aacute;cidos grasos de cadena corta en el colon aunque algunos tienen efectos biol&oacute;gicos beneficiosos por s&iacute; mismos (funci&oacute;n antioxidante...). Estos datos han sido desarrollados en el apartado anterior: grasas-&aacute;cidos grasos de cadena corta.</font></p>     <p><font face="Verdana" size="2"><i>Probi&oacute;ticos</i>: Los probi&oacute;ticos han sido definidos por la The Food Agricultural Organization/World Health Organization (FAO/WHO) como "organismos vivos que administrados a dosis adecuadas aportan un beneficio de salud al hu&eacute;sped". Son organismos no patog&eacute;nicos (levaduras o bacterias) de la comida (sobre todo comercializado en forma de productos l&aacute;cteos fermentados como el yogurt) que pueden producir beneficios en la salud del hu&eacute;sped se cree que al mejorar el balance microbiano. En la patogenia de la EIIC, entre otras m&uacute;ltiples hip&oacute;tesis se habla de la existencia de alteraciones en la flora intestinal y una barrera mucosa defectuosa como factores contribuyentes. Existen varios estudios en animales con enfermedad inflamatoria intestinal cr&oacute;nica que utilizan los probi&oacute;ticos con resultados prometedores<sup>97</sup> aunque s&oacute;lo un peque&ntilde;o n&uacute;mero se ha realizado en humanos<sup>98,99</sup>. La mayor&iacute;a consiguieron resultados alentadores (aumento Ig A, mejor&iacute;a cl&iacute;nica, reducci&oacute;n de la tasa de reca&iacute;das, descenso de la necesidad de corticoides...)<sup>100-103</sup> aunque alguno de ellos resulta claramente ineficaz<sup>104</sup>.</font></p>     <p><font face="Verdana" size="2">Existen, as&iacute; mismo, (aunque en menor n&uacute;mero) varios estudios en pacientes con colitis ulcerosa con buenos resultados<sup>98,105</sup>. Uno de ellos concluye que el preparado probi&oacute;tico VSL#3, compuesto por cepas de bifidobacterium, lactobacilos y estreptococos, comercializado recientemente en Espa&ntilde;a, es efectivo para mantener a remisi&oacute;n en pacientes con colitis ulcerosa intolerantes o al&eacute;rgicos a la mesalazina<sup>105</sup>. Gionchetti y cols., utilizaron tambi&eacute;n este producto y hallaron que preven&iacute;a el desarrollo de pouchitis tras la cirug&iacute;a con anastomosis reservorio-ileal en pacientes con colitis ulcerosa<sup>98</sup>. Tambi&eacute;n parece que VSL#3 previene la reca&iacute;da de la colitis ulcerosa quiescente aunque el efecto cede tras la retirada del producto<sup>98,105</sup>.</font></p>     <p><font face="Verdana" size="2">Los estudios con Escherichia coli Nissle 1917 sugieren una reducci&oacute;n de la actividad inflamatoria en la colitis ulcerosa y en la enfermedad de Crohn y as&iacute; mismo parece prevenir la reca&iacute;da<sup>107</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En ni&ntilde;os, algunos estudios concluyen que el suplemento con ciertas preparaciones de probi&oacute;ticos tiene un efecto beneficioso en cuanto a que parecen prevenir la reca&iacute;da de la colitis ulcerosa quiescente y la pouchitis recidivante<sup>106</sup>. Sin embargo, otros ensayos cl&iacute;nicos no han probado un beneficio significativo como tratamiento primario en la pouchitis<sup>108</sup>.</font></p>     <p><font face="Verdana" size="2">Por ello, a pesar del efecto beneficioso en algunos estudios de VSL#3 y E coli Nissle 1917 en la prevenci&oacute;n de la reca&iacute;da de la pouchitis se necesitan m&aacute;s ensayos cl&iacute;nicos para evaluar las cepas y dosis adecuadas de prebi&oacute;ticos para la prevenci&oacute;n y tratamiento de esta enfermedad.</font></p>     <p><font face="Verdana" size="2">Como resumen de este apartado podemos decir que no existe un claro beneficio en el uso de f&oacute;rmulas espec&iacute;ficas en la EIIC. El uso rutinario de f&oacute;rmulas enterales modificadas (grasa modificada, &aacute;cidos grasos omega 3, glutamina, enriquecidas con factor transformador del crecimiento-&beta;), por tanto, no se recomienda. Sin embargo, si se a&ntilde;adir&aacute;n suplementos de vitaminas (B<sub>12</sub>...) o minerales en caso de existir un d&eacute;ficit de los mismos en relaci&oacute;n con malabsorci&oacute;n u otras causas<sup>52</sup>.</font></font></p>     <p><font face="Verdana" size="2">&nbsp;</font></p>     <p><font face="Verdana"><b>Conclusiones</b></font></p>     <p><font face="Verdana" size="2">(Extra&iacute;das de las gu&iacute;as 2006 de la Sociedad Europea de Nutrici&oacute;n Cl&iacute;nica y Metabolismo (ESPEN)<sup>52</sup>).</font></p>     <p><font face="Verdana" size="2"><i>Enfermedad de Crohn:</i> En la fase aguda de la enfermedad de Crohn se usar&aacute; la nutrici&oacute;n enteral como terapia aislada en adultos si el tratamiento con corticoides no es factible (fracaso o contraindicaci&oacute;n) (grado de recomendaci&oacute;n A) o bien en terapia combinada con f&aacute;rmacos en pacientes malnutridos y en aquellos con estenosis inflamatoria del intestino. En ni&ntilde;os, es considerada como tratamiento de primera l&iacute;nea (<i>grado de recomendaci&oacute;n B</i>).</font></font></p>     <p><font face="Verdana" size="2">Una vez conseguida la remisi&oacute;n, si persiste la inflamaci&oacute;n intestinal (p. ej., en pacientes corticodependientes) usaremos suplementos nutricionales. En aquellos pacientes con remisi&oacute;n cl&iacute;nica duradera (desde hace m&aacute;s de 1 a&ntilde;o) no se ha demostrado beneficio de la nutrici&oacute;n enteral o suplementos en ausencia de d&eacute;ficits nutricionales, lo cual es poco habitual (<i>ambas grado de recomendaci&oacute;n B</i>).</font></p>     <p><font face="Verdana" size="2">Se aconseja, as&iacute; mismo, el uso de nutrici&oacute;n en el perioperatorio cuando existe una p&eacute;rdida de peso e hipoalbuminemia previa a la cirug&iacute;a (<i>grado de recomendaci&oacute;n C</i>). Se usar&aacute; nutrici&oacute;n a trav&eacute;s de SNG y/o suplementos v&iacute;a oral a&ntilde;adidos a la dieta habitual para mejorar el estado nutricional y eliminar las consecuencias de la malnutrici&oacute;n (<i>grado de recomendaci&oacute;n A</i>).</font></p>     <p><font face="Verdana" size="2">Se corregir&aacute;n los d&eacute;ficits espec&iacute;ficos (vitaminas...) (<i>grado de recomendaci&oacute;n C</i>).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Es m&aacute;s beneficioso la nutrici&oacute;n enteral continua que en bolos al asociarse a una menor incidencia de complicaciones (<i>grado de recomendaci&oacute;n B</i>).</font></p>     <p><font face="Verdana" size="2">No se recomienda el uso de f&oacute;rmulas elementales ni modificadas (glutamina, &aacute;cidos grasos omega 3) al no haberse encontrado beneficios (<i>grado de recomendaci&oacute;n A</i>).</font></p>     <p><font face="Verdana" size="2">La nutrici&oacute;n enteral puede mejorar la calidad de vida en pacientes malnutridos con enfermedad de Crohn.</font></p>     <p><font face="Verdana" size="2"><i>Colitis ulcerosa:</i> En el caso de la colitis ulcerosa no es posible recomendar la nutrici&oacute;n enteral en la enfermedad activa ni para mantener la remisi&oacute;n al no existir estudios concluyentes (<i>grado de recomendaci&oacute;n C</i>).</font></p>     <p><font face="Verdana" size="2">Si existe malnutrici&oacute;n o ingesta deficiente, debe iniciarse el soporte nutricional (<i>grado de recomendaci&oacute;n C</i>).</font></p>     <p><font face="Verdana" size="2">Se tratar&aacute;n las deficiencias de sustratos con suplementos (<i>grado de recomendaci&oacute;n C</i>).</font></font></p>     <p><font face="Verdana" size="2">El valor de f&oacute;rmulas espec&iacute;ficas (&aacute;cidos grasos omega 3...) no est&aacute; probado y no se recomienda (<i>grado de recomendaci&oacute;n C</i>).</font></p>     <p><font face="Verdana" size="2">No existen datos que asocien la malnutrici&oacute;n y el riesgo aumentado de complicaciones en el postoperatorio, aunque se asume razonablemente una asociaci&oacute;n al igual que en la enfermedad de Crohn.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Preguntas sin responder</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">A pesar de todos los conocimientos y avances desarrollados en los &uacute;ltimos a&ntilde;os quedan importantes &aacute;reas en las que seguir investigando.</font></p>     <p><font face="Verdana" size="2">¿Podemos mejorar la tolerancia y eficacia de la nutrici&oacute;n modificando la composici&oacute;n de la f&oacute;rmula?</font></p>     <p><font face="Verdana" size="2">¿Hasta qu&eacute; punto el contenido lip&iacute;dico de la dieta puede influir en la respuesta inflamatoria?</font></p>     <p><font face="Verdana" size="2">¿Existen grupos de pacientes que pueden beneficiarse m&aacute;s?</font></p>     <p><font face="Verdana" size="2">¿Por qu&eacute; el tratamiento nutricional no presenta similar eficacia en la colitis ulcerosa?</font></p>     <p><font face="Verdana" size="2">¿Por qu&eacute; es menos eficaz en la enfermedad de Crohn col&oacute;nica que si se afecta el intestino delgado?</font></p>     <p><font face="Verdana" size="2">¿Qu&eacute; papel juega la nutrici&oacute;n en el contexto de los distintos tratamientos? ¿Debemos realizar estudios que comparen la nutrici&oacute;n enteral asociada con otros tratamientos?</font></p>     <p><font face="Verdana" size="2">¿Qu&eacute; papel juegan sustancias como los antioxidantes?¿En qu&eacute; dosis y forma debemos administrarlos?</font></p>     <p><font face="Verdana" size="2">¿Cu&aacute;l es la relaci&oacute;n entre la microbiota intestinal y la EIIC? ¿Hasta qu&eacute; punto son beneficiosos los pre- y probi&oacute;ticos? ¿Qu&eacute; cepas son las que debemos seleccionar y en qu&eacute; cantidad son efectivas?</font></p>     <p><font face="Verdana" size="2">Los importantes descubrimientos que se vienen realizando en cuanto a la etiopatogenia de estas enfermedades y los grandes avances en el campo nutricional nos permitir&aacute;n muy probablemente responder a estas preguntas en un futuro pr&oacute;ximo.</font></font></p>     ]]></body>
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Aliment Pharmacol Ther 2003; 17:509-515.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3533425&pid=S0212-1611200800070000300108&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b><a name="back"></a><a href="#top"><img border="0" src="/img/revistas/nh/v23n5/seta.gif" width="15" height="17"></a> Dirección para correspondencia:</b>    <br>A. Mij&aacute;n de la Torre.    <br>Servicio de Medicina Interna (Nutrici&oacute;n).    <br>Hospital Gral. Yag&uuml;e, 8.ª planta.    <br>Avda. del Cid, 96.    <br>09005 Burgos.    <br>E-mail: <a href="mailto:mijan@hgy.es">mijan@hgy.es</a></font></p>     <p><font face="Verdana" size="2">Recibido: 11-I-2008.    ]]></body>
<body><![CDATA[<br>Aceptado: 9-VI-2008.</font></p>      ]]></body><back>
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