<?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>S0212-16112007000400008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Relación entre la intervención nutricional y la calidad de vida en el paciente con cáncer]]></article-title>
<article-title xml:lang="en"><![CDATA[Relationship between nutritional intervention and quality of life in cancer patients]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marín Caro]]></surname>
<given-names><![CDATA[Mª]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laviano]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pichard]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Candela]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario de Ginebra Nutrición Clínica ]]></institution>
<addr-line><![CDATA[Ginebra ]]></addr-line>
<country>Suiza</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad La Sapienza Departamento Médico de Nutrición Clínica ]]></institution>
<addr-line><![CDATA[Roma ]]></addr-line>
<country>Italia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Universitario La Paz de Madrid Nutrición Clínica y Dietética ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<volume>22</volume>
<numero>3</numero>
<fpage>337</fpage>
<lpage>350</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112007000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112007000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112007000400008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Calidad de Vida (CdV) es un concepto que evalúa los factores físicos, psicológicos y sociales, los cuales influencian el bienestar de los pacientes. El cáncer y su tratamiento reinduce en severos cambios metabólicos asociados a un deterioro de la CdV. Dichas alteraciones contribuyen al incremento del gasto energético y a una disminución de la ingesta alimentaria. Así mismo, esto puede conllevar a desarrollarse la caquexia tumoral, debido a la complejidad de interacciones entre citoquinas proinflamatorias y el metabolismo del huésped. Por otro lado, y más allá de las alteraciones físicas y de los efectos metabólicos del cáncer, los pacientes frecuentemente sufren también de stress psicológico, como la depresión. La intervención nutricional se podría implementar tan pronto como el cáncer es diagnosticado. De acuerdo a las necesidades del paciente, considerando el tipo de tratamiento oncológico (si es curativo o paliativo), las condiciones clínicas y el estado nutricional. Con el objetivo de reducir o incluso revertir el deterioro del estado nutricional, mejorar el estado general y consecuentemente mejorar la CdV. La intervención nutricional, que acompaña el tratamiento oncológico con la intención de curar, se centra principalmente, en la optimización del balance entre el gasto energético y la ingesta. Para alcanzar objetivos específicos tales como: disminución de la tasa de complicaciones, mejorar la respuesta y la tolerancia al tratamiento oncológico. El soporte nutricional en cuidados paliativos, se enfoca en controlar los síntomas relacionados con la ingesta de alimentos y retrasar la pérdida de autonomía. Con la finalidad de mantener o incluso mejorar, la CdV de los pacientes. La revisión de la literatura, corrobora que el tratamiento nutricional debe hacer parte dentro del soporte oncológico integral, porque contribuye considerablemente a la mejoría de la CdV. Debido a la posibilidad de identificar las necesidades y expectativas de los pacientes evaluando su CdV, ésta se podría incluir dentro de la evaluación nutricional, para elaborar un soporte nutricional adecuado, a la medida del paciente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Quality of life (QOL) is a concept assessing physical, psychological and social factors which are influencing the patients' well being. Cancer and its therapy induce severe metabolic changes associated with QOL impairment. These alterations contribute to an increased energy wasting and a decreased food intake. Besides, it may lead to tumoral cachexia due to the complex interactions between pro-inflammatory cytokines and the host metabolism. On the other hand, and beyond physical impairments and metabolic effects from cancer, patients often suffer from psychological stress, such as depression. A nutritional intervention should be implemented as soon as cancer is diagnosed. It should be appropriate to the individual needs of the patient, considering the type of oncologic treatment (whether it is curative or palliative), the clinical conditions and the nutritional status. The aim is to reduce or even revert nutritional status impairment, improve the general condition, and subsequently improve quality of life. The primary focus of nutritional intervention accompanying oncologic treatment intended to cure is on the optimization of the balance between energy waste and food intake. Thus trying to achieve further specific purposes such as a decrease of rate of complications and an amelioration of the response and tolerance to the oncologic therapy. The purpose of nutritional support in palliative care is controlling the symptoms related to food intake and delaying the loss of autonomy. And by this means maintaining or improving patients' QOL. It is corraborated by a literature review, that nutritional therapy should form part of the integral oncological support since it contributes considerably to a QOL improvement. Because of the possibility to identify the patients' needs and expectations by assessing their QOL it should be generally included into their nutritional evaluation to be able to tailor the adequate nutritional support.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cáncer]]></kwd>
<kwd lng="es"><![CDATA[Calidad de vida]]></kwd>
<kwd lng="es"><![CDATA[Malnutrición]]></kwd>
<kwd lng="es"><![CDATA[Pérdida de peso]]></kwd>
<kwd lng="es"><![CDATA[Composición corporal]]></kwd>
<kwd lng="es"><![CDATA[Valoración nutricional]]></kwd>
<kwd lng="es"><![CDATA[Tratamiento oncológico curativo]]></kwd>
<kwd lng="es"><![CDATA[Tratamiento oncológico paliativo]]></kwd>
<kwd lng="es"><![CDATA[Soporte nutricional]]></kwd>
<kwd lng="es"><![CDATA[Suplementación nutricional oral]]></kwd>
<kwd lng="es"><![CDATA[Recomendaciones dietéticas]]></kwd>
<kwd lng="en"><![CDATA[Cancer]]></kwd>
<kwd lng="en"><![CDATA[Quality of life]]></kwd>
<kwd lng="en"><![CDATA[Malnutrition]]></kwd>
<kwd lng="en"><![CDATA[Weight loss]]></kwd>
<kwd lng="en"><![CDATA[Body composition]]></kwd>
<kwd lng="en"><![CDATA[Nutritional assessment]]></kwd>
<kwd lng="en"><![CDATA[Curative oncologic therapy]]></kwd>
<kwd lng="en"><![CDATA[Palliative oncologic therapy]]></kwd>
<kwd lng="en"><![CDATA[Nutritional support]]></kwd>
<kwd lng="en"><![CDATA[Oral nutritional supplementation]]></kwd>
<kwd lng="en"><![CDATA[Nutritional counseling]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><a name="top"></a><font size="2" face="Verdana"><b>ORIGINAL</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>Relación entre la intervención nutricional y la calidad de vida en el paciente con cáncer</b></font></p>     <p><font face="Verdana" size="4"><b>Relationship between nutritional intervention and quality of life in cancer patients</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Mª Marín Caro<sup>*</sup>, A. Laviano, MD<sup>**</sup>, C. Pichard, MD, PhD<sup>*</sup> y C. Gómez Candela, MD, PhD<sup>***</sup></b></font></p>     <p><font size="2" face="Verdana"><sup>*</sup>Nutrición Clínica. Hospital Universitario de Ginebra. Suiza.    <BR><sup>**</sup>Departamento Médico de Nutrición Clínica. Universidad La Sapienza. Roma. Italia.    <br><sup>***</sup>Nutrición Clínica y Dietética. Hospital Universitario La Paz de Madrid. España.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><a href="#back">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font size="2" face="Verdana"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana">La Calidad de Vida (CdV) es un concepto que eval&uacute;a los factores f&iacute;sicos, psicol&oacute;gicos y sociales, los cuales influencian el bienestar de los pacientes. El c&aacute;ncer y su tratamiento reinduce en severos cambios metab&oacute;licos asociados a un deterioro de la CdV. Dichas alteraciones contribuyen al incremento del gasto energ&eacute;tico y a una disminuci&oacute;n de la ingesta alimentaria. As&iacute; mismo, esto puede conllevar a desarrollarse la caquexia tumoral, debido a la complejidad de interacciones entre citoquinas proinflamatorias y el metabolismo del hu&eacute;sped. Por otro lado, y m&aacute;s all&aacute; de las alteraciones f&iacute;sicas y de los efectos metab&oacute;licos del c&aacute;ncer, los pacientes frecuentemente sufren tambi&eacute;n de stress psicol&oacute;gico, como la depresi&oacute;n.    <br> La intervenci&oacute;n nutricional se podr&iacute;a implementar tan pronto como el c&aacute;ncer es diagnosticado. De acuerdo a las necesidades del paciente, considerando el tipo de tratamiento oncol&oacute;gico (si es curativo o paliativo), las condiciones cl&iacute;nicas y el estado nutricional. Con el objetivo de reducir o incluso revertir el deterioro del estado nutricional, mejorar el estado general y consecuentemente mejorar la CdV.    <br>La intervenci&oacute;n nutricional, que acompa&ntilde;a el tratamiento oncol&oacute;gico con la intenci&oacute;n de curar, se centra principalmente, en la optimizaci&oacute;n del balance entre el gasto energ&eacute;tico y la ingesta. Para alcanzar objetivos espec&iacute;ficos tales como: disminuci&oacute;n de la tasa de complicaciones, mejorar la respuesta y la tolerancia al tratamiento oncol&oacute;gico.    <br>El soporte nutricional en cuidados paliativos, se enfoca en controlar los s&iacute;ntomas relacionados con la ingesta de alimentos y retrasar la p&eacute;rdida de autonom&iacute;a. Con la finalidad de mantener o incluso mejorar, la CdV de los pacientes. La revisi&oacute;n de la literatura, corrobora que el tratamiento nutricional debe hacer parte dentro del soporte oncol&oacute;gico integral, porque contribuye considerablemente a la mejor&iacute;a de la CdV. Debido a la posibilidad de identificar las necesidades y expectativas de los pacientes evaluando su CdV, &eacute;sta se podr&iacute;a incluir dentro de la evaluaci&oacute;n nutricional, para elaborar un soporte nutricional adecuado, a la medida del paciente.</font></p>     <p><font size="2" face="Verdana"><B>Palabras clave:</B> Cáncer. Calidad de vida. Malnutrición. Pérdida de peso. Composición corporal. Valoración nutricional. Tratamiento oncológico curativo. Tratamiento oncológico paliativo. Soporte nutricional. Suplementación nutricional oral. Recomendaciones dietéticas.</font></p> <hr size="1">     <p><B><font size="2" face="Verdana">ABSTRACT</font></B></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Quality of life (QOL) is a concept assessing physical, psychological and social factors which are influencing the patients' well being. Cancer and its therapy induce severe metabolic changes associated with QOL impairment. These alterations contribute to an increased energy wasting and a decreased food intake. Besides, it may lead to tumoral cachexia due to the complex interactions between pro-inflammatory cytokines and the host metabolism. On the other hand, and beyond physical impairments and metabolic effects from cancer, patients often suffer from psychological stress, such as depression.    <br>A nutritional intervention should be implemented as soon as cancer is diagnosed. It should be appropriate to the individual needs of the patient, considering the type of oncologic treatment (whether it is curative or palliative), the clinical conditions and the nutritional status. The aim is to reduce or even revert nutritional status impairment, improve the general condition, and subsequently improve quality of life.    <br>The primary focus of nutritional intervention accompanying oncologic treatment intended to cure is on the optimization of the balance between energy waste and food intake. Thus trying to achieve further specific purposes such as a decrease of rate of complications and an amelioration of the response and tolerance to the oncologic therapy.    <br>The purpose of nutritional support in palliative care is controlling the symptoms related to food intake and delaying the loss of autonomy. And by this means maintaining or improving patients' QOL. It is corraborated by a literature review, that nutritional therapy should form part of the integral oncological support since it contributes considerably to a QOL improvement.    <br>Because of the possibility to identify the patients' needs and expectations by assessing their QOL it should be generally included into their nutritional evaluation to be able to tailor the adequate nutritional support.</font></p>     <p><font size="2" face="Verdana"><B>Key words:</B> Cancer. Quality of life. Malnutrition. Weight loss. Body composition. Nutritional assessment. Curative oncologic therapy. Palliative oncologic therapy. Nutritional support. Oral nutritional supplementation. Nutritional counseling.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana"><b>Introducci&oacute;n</b></font></p>     <p><font size="2" face="Verdana">La caquexia tumoral tiene un profundo impacto sobre el estado f&iacute;sico, psicol&oacute;gico y social de los pacientes, debido a que tienen un metabolismo alterado, marcado por un incremento de la prot&eacute;olisis y la lip&oacute;lisis, mientras la s&iacute;ntesis muscular de prote&iacute;na est&aacute; disminuida, provocando finalmente una p&eacute;rdida de masa muscular y grasa<sup>1,2</sup>. Adicionalmente, el metabolismo de los hidratos de carbono est&aacute; modificado por el crecimiento del tumor, con una disminuida producci&oacute;n hep&aacute;tica de glucosa y el incremento de la actividad del ciclo de Cori, mientras la sensibilidad insul&iacute;nica de los tejidos perif&eacute;ricos est&aacute; reducida<sup>1</sup>.</font></p>     <p><font size="2" face="Verdana">Estas alteraciones contribuyen a un incremento del gasto energ&eacute;tico y puede resultar en una p&eacute;rdida progresiva<sup>3</sup>. Sin embargo, a pesar del hipermetabolismo y la p&eacute;rdida de peso (exacerbada por estr&eacute;s, dolor, infecci&oacute;n, cirug&iacute;as...), la ingesta de los pacientes no se incrementa<sup>4</sup>y esto va promoviendo un gasto paulatino.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La p&eacute;rdida de peso relacionada con el c&aacute;ncer difiere del ayuno simple, en que &eacute;sta &uacute;ltima puede restaurarse lentamente con la ingesta, y conducir a un estado nutricional adecuado. En el paciente con caquexia tumoral las anormalidades metab&oacute;licas asociadas al tumor, frecuentemente evitan la restauraci&oacute;n debido a la complejidad de interacciones entre citoquinas proinflamatorias (tales como: interleuquina-1, interleuquina- 6) y el metabolismo del hu&eacute;sped<sup>2,5,6</sup>.</font></p>     <p><font size="2" face="Verdana">La caquexia representa de un 10-22% de todas las muertes por c&aacute;ncer1. Es un s&iacute;ndrome bif&aacute;sico, que consiste en un "per&iacute;odo precl&iacute;nico" y "la fase de caquexia". En el per&iacute;odo precl&iacute;nico los mecanismos moleculares responsables de la prot&eacute;olisis y la lip&oacute;lisis est&aacute;n incrementados, las anormalidades del comportamiento alimentario pueden estar presentes contribuyendo al deterioro del peso corporal y del estado nutricional<sup>7</sup>. Cuando los efectos perjudiciales de la prot&eacute;olisis, la lip&oacute;lisis y la disminuci&oacute;n de la ingesta interfieren con el estado nutricional, y son evidentes los signos cl&iacute;nicos de la "fase de caquexia". Se caracteriza, por la p&eacute;rdida de peso, la reducci&oacute;n de la masa grasa y muscular, anorexia con reducci&oacute;n de la ingesta, saciedad temprana, fatiga, anemia, hipoalbuminemia, y debilidad progresiva<sup>5,8</sup>.</font></p>     <p><font size="2" face="Verdana">Adem&aacute;s de los efectos del c&aacute;ncer, los pacientes frecuentemente sufren tambi&eacute;n de alteraciones psicol&oacute;gicas, y particularmente depresi&oacute;n<sup>6</sup>.</font></p>     <p><font size="2" face="Verdana">Los tratamientos oncol&oacute;gicos tales como: cirug&iacute;a<sup>9,10</sup>, quimioterapia<sup>11</sup> y radioterapia<sup>12</sup> producen s&iacute;ntomas adicionales, ya sea en forma aguda o cr&oacute;nica que repercuten negativamente sobre la ingesta y el estado nutricional<sup>5</sup>. Dicho impacto sobre el estado nutricional, depende del tipo y duraci&oacute;n del tratamiento, dosis y respuesta individual del paciente<sup>13</sup>, el gasto energ&eacute;tico est&aacute; generalmente incrementado<sup>13</sup> y de esta manera, se va promoviendo progresivamente la p&eacute;rdida.</font></p>     <p><font size="2" face="Verdana">Bas&aacute;ndonos en las posibilidades que ofrece el tratamiento  oncol&oacute;gico, los pacientes reciben tratamiento paliativo o de intenci&oacute;n curativa. En ambos casos, el tratamiento puede estar acompa&ntilde;ado de intervenciones nutricionales espec&iacute;ficas adecuadas que tienen como objetivo primordial mejorar el estado general y la calidad de vida (CdV)<sup>13</sup>.</font></p>     <p><font size="2" face="Verdana">El soporte nutricional que acompa&ntilde;a el tratamiento de intenci&oacute;n curativa tiene adicionales y espec&iacute;ficos objetivos. El de incrementar la respuesta al tratamiento, disminuir la tasa de complicaciones, y posiblemente reducir la morbilidad, manteniendo el balance entre el gasto energ&eacute;tico y la ingesta, o minimizando el disbalance entre &eacute;stos<sup>14,15</sup>. El tratamiento nutricional en cuidados paliativos, tiene como objetivo, el mejorar la CdV de los pacientes, contribuyendo al manejo de los s&iacute;ntomas cl&iacute;nicos (n&aacute;useas, v&oacute;mitos. etc.)<sup>16,17</sup>.</font></p>     <p><font size="2" face="Verdana">Para la elaboraci&oacute;n de esta revisi&oacute;n bibliogr&aacute;fica se tomaron art&iacute;culos originales publicados en ingl&eacute;s, a partir del a&ntilde;o 2000; y en cuanto a los art&iacute;culos relacionados con la evaluaci&oacute;n de la calidad de vida se tomaron como relevantes los que estuvieran publicados a partir del a&ntilde;o 1980 usando la base de datos de PUBMED. Todos los art&iacute;culos fueron sistem&aacute;ticamente evaluados por su calidad y relevancia por el primer autor, y luego por los co-autores para identificar art&iacute;culos que fuesen valiosos.</font></p>     <p><font size="2" face="Verdana">Esta revisi&oacute;n est&aacute; enfocada sobre la relaci&oacute;n entre nutrientes y la mejor&iacute;a de la CdV en pacientes oncol&oacute;gicos. En tres secciones consecutivas dirigidas, se tratan t&oacute;picos relacionados con la CdV en pacientes con c&aacute;ncer, la eficacia de las distintas modalidades de tratamiento nutricional y por &uacute;ltimo el impacto de la intervenci&oacute;n nutricional sobre la CdV.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>La Calidad de Vida (CdV) de los pacientes oncol&oacute;gicos</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La salud se define como: "el estado de bienestar f&iacute;sico y mental, y no solo por la ausencia de enfermedad" <sup>18</sup>. La salud relacionada con la CdV, tal c&oacute;mo est&aacute; considerada en este art&iacute;culo, es un concepto multidimensional que cuantifica los efectos psicol&oacute;gicos, f&iacute;sicos y sociales de la enfermedad y su tratamiento<sup>17,19-22</sup>y que generalmente, se eval&uacute;a con cuestionarios que son contestados por el paciente<sup>21</sup>.</font></p>     <p><font size="2" face="Verdana">En los pacientes con c&aacute;ncer, el estado de salud es un buen reflejo de la medida de la calidad de vida<sup>23</sup>, la cual est&aacute; ampliamente influenciada por aspectos nutricionales<sup>24-37</sup>.</font></p>     <p><font size="2" face="Verdana">Un gran n&uacute;mero de cuestionarios gen&eacute;ricos y espec&iacute;ficos para determinadas enfermedades, han sido desarrollados y algunos han sido exhaustivamente validados, tales como: el EORTC QLQ-C30<sup>38-40</sup>, el FACT-G<sup>41,42</sup> o el SF -36<sup>43</sup>. En la <a target="_blank" href="/img/revistas/nh/v22n3/original5_t1.gif">tablas I</a> y <a target="_blank" href="/img/revistas/nh/v22n3/original5_t2.gif">II</a>, se reportan algunos cuestionarios frecuentemente usados para medir la calidad de vida, validados en pacientes oncol&oacute;gicos. Aunque aparentemente son similares, los diferentes cuestionarios var&iacute;an en su objetivo principal (habilidad f&iacute;sica, s&iacute;ntomas, entre otros)<sup>19,44-49</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>El Soporte Nutricional en los Pacientes Oncol&oacute;gicos</b></font></p>     <p><font size="2" face="Verdana">La malnutrici&oacute;n y la caquexia se observan frecuentemente en el c&aacute;ncer, y si no se toman medidas que contribuyan a contrarrestar su efecto, incluso un inadecuado estado nutricional est&aacute; relacionado paralelamente con la reducci&oacute;n de la CdV (<a href="#f1">figs. 1</a> y <a href="#f2">2</a>).</font></p>     <p align="center"><a name="f1"><img src="/img/revistas/nh/v22n3/original5_f1.gif" width="292" height="405"></a></p>     <p align="center"><a name="f2"><img src="/img/revistas/nh/v22n3/original5_f2.gif" width="292" height="418"></a></p>     <p><font size="2" face="Verdana">Puede decirse que la intervenci&oacute;n nutricional es esencial para prevenir y/o revertir la malnutrici&oacute;n<sup>50</sup>mediante un balance energ&eacute;tico y proteico<sup>14</sup>, adem&aacute;s de un adecuado aporte de vitaminas, minerales, elementos traza y de  electrolitos<sup>6,15</sup>.</font></p>      <p><font size="2" face="Verdana">Sin embargo, la intervenci&oacute;n nutricional no suele considerarse fundamental dentro del tratamiento oncol&oacute;gico, pero es necesaria en todos los estadios de la enfermedad y de todas las estrategias terap&eacute;uticas<sup>50</sup>porque contribuye al control de los s&iacute;ntomas relacionados con el c&aacute;ncer (anorexia, n&aacute;useas, v&oacute;mitos, diarrea, mucositis, entre otros)<sup>5</sup>, reduce las complicaciones postquir&uacute;rgicas (f&iacute;stulas, dehiscencia de sutura, etc&eacute;tera)<sup>51</sup> y la tasa de infecci&oacute;n<sup>52,53</sup>, contribuye a disminuir la estancia hospitalaria<sup>52,54-56</sup>, mejora la tolerancia al tratamiento<sup>53,55,57</sup>, aumenta la respuesta inmunol&oacute;gica en el hu&eacute;sped<sup>52,58,59</sup>. Incluso, una intervenci&oacute;n nutricional oportuna est&aacute; asociada con una mejor&iacute;a de la CdV<sup>28,60</sup>, tal como se ha resumido en algunas observaciones de diferentes estudios<sup>61</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La interrelaci&oacute;n existente entre el estado nutricional y CdV est&aacute; comenzando a ser una cuesti&oacute;n prioritaria en Oncolog&iacute;a; particularmente si destacamos los significativos avances en el tratamiento oncol&oacute;gico de los &uacute;ltimos a&ntilde;os. Permitiendo una prolongaci&oacute;n del tiempo de supervivencia para muchos pacientes, quienes podr&iacute;an disponer as&iacute; de un tiempo de un tiempo extra para que la investigaci&oacute;n cient&iacute;fica pueda seguir proporcion&aacute;ndoles ayuda (<a href="#f3">figs. 3</a> y <a href="#f4">4</a>).</font></p>     <p align="center"><a name="f3"><img src="/img/revistas/nh/v22n3/original5_f3.gif" width="291" height="339"></a></p>     <p align="center"><a name="f4"><img src="/img/revistas/nh/v22n3/original5_f4.gif" width="297" height="341"></a></p>     <p><font size="2" face="Verdana">Tambi&eacute;n es relevante considerar el aspecto psicol&oacute;gico, tambi&eacute;n interrelacionado con el soporte nutricional en los pacientes oncol&oacute;gicos. Tal y como muestra un estudio en pacientes recientemente diagnosticados con c&aacute;ncer, que consideran que la nutrici&oacute;n y el mantenimiento del estado nutricional desempe&ntilde;a un papel importante dentro de su estrategia terap&eacute;utica<sup>62</sup>. El ofrecer a los pacientes apoyo y soporte nutricional individualizado, hace que ellos tengan confianza y esperen resultados positivos en el tratamiento de su enfermedad, permitiendo de esta manera mejorar su CdV.</font></p>      <p><font size="2" face="Verdana"><i>Evaluaci&oacute;n de la malnutrici&oacute;n y del riesgo del estado nutricional</i></font></p>     <p><font size="2" face="Verdana">Una detecci&oacute;n temprana de las alteraciones nutricionales, permite proporcionar una intervenci&oacute;n precoz, pero requiere el uso herramientas adecuadas que puedan evaluar el estado nutricional de los pacientes con c&aacute;ncer<sup>63-65</sup>.</font></p>     <p><font size="2" face="Verdana">Dichas herramientas son usualmente multiparam&eacute;tricas, como por ejemplo: medidas del &iacute;ndice de masa corporal, p&eacute;rdida reciente de peso, par&aacute;metros  antropom&eacute;tricos (tales como &aacute;rea de la circunferencia media del brazo y pliegue del tr&iacute;ceps), ingesta alimentaria, prote&iacute;nas plasm&aacute;ticas (alb&uacute;mina etc.), capacidad funcional y condiciones cl&iacute;nicas<sup>15,66,67</sup>.</font></p>     <p><font size="2" face="Verdana">Las herramientas de <i>screening</i> nutricional que son recomendadas por la European Society for Clinical Nutrition and Metabolism (ESPEN) para detectar malnutrici&oacute;n son: Malnutrition Universal Screening Tool (MUST), Nutritional Risk Screening (NRS-2002) and Mini Nutritional Assessment (MNA)<sup>67</sup>. El <i>screening</i> MUST est&aacute; indicado para pacientes que viven dentro de la comunidad, relaciona el estado nutricional de los pacientes con su funcionalidad. El <i>screening</i> NRS-2002 se ha constatado que tiene sensibilidad y especificidad en el momento de la admisi&oacute;n de los pacientes en los hospitales<sup>68</sup>, mientras que el MNA ha sido dise&ntilde;ado para personas mayores.</font></p>     <p><font size="2" face="Verdana">Otros sistema de evaluaci&oacute;n, y que ha sido recomendando por la American Society for Parenteral and Enteral Nutrition (ASPEN)<sup>67,69</sup>, es el Subjective Global Assessment (SGA)<sup>66</sup>, e incluso se ha elaborado una versi&oacute;n que ha sido adaptada para ser generada por el paciente (PG-SGA) y con la posibilidad de otorgar puntuaci&oacute;n, la scored SGA<sup>70,71</sup> que ha sido adaptada para pacientes oncol&oacute;gicos<sup>72</sup> y adem&aacute;s, se ha encontrado una asociaci&oacute;n con la CdV de los pacientes que reciben tratamiento activo con radioterapia<sup>73</sup>.</font></p>     <p><font size="2" face="Verdana">De este modo, teniendo en cuenta la gran disponibilidad de herramientas de <i>screening</i> que han sido validadas y que son de f&aacute;cil aplicaci&oacute;n, se podr&iacute;an considerar como indispensables para la detecci&oacute;n de la malnutrici&oacute;n y del riesgo nutricional en los pacientes con c&aacute;ncer<sup>74</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><i>El soporte nutricional en los pacientes con tratamiento de intenci&oacute;n curativa</i></font></p>     <p><font size="2" face="Verdana">El tratamiento de intenci&oacute;n curativa es t&iacute;picamente intensivo y promueve un incremento de la vulnerabilidad para desarrollar malnutrici&oacute;n. Especialmente si la terapia oncol&oacute;gica se prolonga por mucho tiempo debido a la respuesta individual del paciente.</font></p>     <p><font size="2" face="Verdana">Sin embargo, el riesgo del deterioro del estado nutricional del paciente est&aacute; estrechamente relacionado con la localizaci&oacute;n del tumor y del riesgo inherente del tipo de tratamiento oncol&oacute;gico. Por ejemplo, las condiciones cl&iacute;nicas en las cuales el riesgo nutricional es particularmente elevado son el tratamiento concomitante de radioterapia y quimioterapia en pacientes con c&aacute;ncer de cabeza y cuello, la administraci&oacute;n de altas dosis de agentes antineopl&aacute;sicos tales como: cisplatino, doxorubicina, flourouracilo<sup>13</sup> o resecciones masivas del aparato digestivo<sup>10,75</sup>.</font></p>     <p><font size="2" face="Verdana">Cualquier tipo de soporte nutricional debe comenzar en el momento del diagn&oacute;stico de la enfermedad<sup>50</sup>y debe ser mantenido durante el per&iacute;odo que dure el tratamiento, hasta que no exista el riesgo latente de malnutrici&oacute;n.</font></p>     <p><font size="2" face="Verdana">La intervenci&oacute;n nutricional ideal comienza con la evaluaci&oacute;n del estado nutricional del paciente y bas&aacute;ndonos en la evaluaci&oacute;n preliminar; indicar al paciente la intervenci&oacute;n nutricional m&aacute;s conveniente seg&uacute;n sus necesidades y requerimientos individuales. Incluyendo, recomendaciones diet&eacute;ticas <sup>50</sup>, suplementos nutricionales orales<sup>76</sup>, nutrici&oacute;n enteral (NE)<sup>56</sup> o nutrici&oacute;n parenteral total (NPT)<sup>77</sup>. Adem&aacute;s, tener en cuenta las reevaluaciones o controles nutricionales, importantes para monitorizar la eficacia o para reconsiderar sobre el tipo de intervenci&oacute;n nutricional, hasta que se pueda restablecer un adecuado estado nutricional.</font></p>     <p><font size="2" face="Verdana"><i>El soporte nutricional en los pacientes con tratamiento paliativo</i></font></p>     <p><font size="2" face="Verdana">Por definici&oacute;n, el tratamiento oncol&oacute;gico paliativo es el suministrado para los pacientes que tienen una expectativa de vida inferior o igual a 3 meses<sup>78</sup>, o para quienes padecen un tipo de c&aacute;ncer que no responde al tratamiento oncol&oacute;gico<sup>79</sup>. Pero, si la expectativa de vida es de menos de 1 mes, los pacientes est&aacute;n considerados en una fase terminal<sup>78</sup>.</font></p>     <p><font size="2" face="Verdana">El objetivo principal del tratamiento paliativo es el mantenimiento o restablecimiento del "bienestar" de los pacientes<sup>78</sup>, de su rendimiento en la vida diaria y su CdV<sup>80</sup>.</font></p>     <p><font size="2" face="Verdana">La intervenci&oacute;n nutricional en los cuidados paliativos se enfoca primordialmente sobre el control de los s&iacute;ntomas (tales como: n&aacute;useas, saciedad temprana, v&oacute;mitos), el mantenimiento de un adecuado estado de hidrataci&oacute;n, preservando todo lo posible el peso corporal y la composici&oacute;n corporal (masa muscular y grasa vs edema y ascitis)<sup>13</sup>. Pero tambi&eacute;n va a depender de los deseos del paciente y de su familia<sup>80</sup>, teniendo en cuenta adem&aacute;s, los riesgos y los beneficios relacionados con la NE y la NPT si las llegase a recibir<sup>15,78</sup>.</font></p>     <p><font size="2" face="Verdana">Sin embargo, la intervenci&oacute;n nutricional no puede tenerse en cuenta solamente, cuando los pacientes oncol&oacute;gicos se encuentran en una fase paliativa de su enfermedad, sino considerarse como una terapia de apoyo, para ser tenida en cuenta, en cualquier fase de la enfermedad.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana"><b>El Impacto de la intervenci&oacute;n nutricional sobre la CdV de los pacientes oncol&oacute;gicos</b></font></p>     <p><font size="2" face="Verdana">Recientes estudios han expuesto, que en c&aacute;ncer existe una influencia negativa del estado nutricional sobre la CdV<sup>14,30,35</sup>. La p&eacute;rdida de peso y otros s&iacute;ntomas relacionados con la nutrici&oacute;n, han sido asociados con una baja CdV<sup>16,36,78</sup>. Incluso, ha habido una clara correlaci&oacute;n entre la reducci&oacute;n de la ingesta nutricional y la CdV<sup>30</sup>, document&aacute;ndose que esta ingesta influenci&oacute; en un 20% la CdV<sup>35</sup> y que una baja CdV st&aacute; relacionada con la reducci&oacute;n de la respuesta al tratamiento oncol&oacute;gico<sup>81</sup>.</font></p>     <p><font size="2" face="Verdana">Dependiendo de los resultados de la evaluaci&oacute;n nutricional, un soporte &oacute;ptimo requiere ser seleccionado con el objetivo de mejorar la CdV de los pacientes. Las opciones disponibles son: recomendaciones diet&eacute;ticas, suplementos nutricionales orales, NE o NPT (<a target="_blank" href="/img/revistas/nh/v22n3/original5_t3.gif">tabla III</a>). Cualquier opci&oacute;n que sea escogida, puede comenzarse tan pronto como sea posible. Incluso, se ha demostrado que un tratamiento intensivo e individualizado, contribuye a mejorar la CdV de los pacientes, si es aplicada en el estadio temprano de la enfermedad<sup>28</sup>.</font></p>     <p><font size="2" face="Verdana">Aunque, algunos de los estudios de intervenci&oacute;n nutricional, que se citan en esta revisi&oacute;n, no incluyen una medida directa de la CdV con herramientas v&aacute;lidas y espec&iacute;ficas. Nosotros consideramos que los resultados positivos de la intervenci&oacute;n nutricional, sobre la funci&oacute;n inmunitaria, la tasa de complicaciones, el tiempo de reducci&oacute;n de la antibioterapia, la disminuci&oacute;n de la estancia hospitalaria, el control de los s&iacute;ntomas, del peso corporal y de la composici&oacute;n corporal, pueden tomarse como factores susceptibles de medir la CdV, es decir, extrapolar &eacute;stos marcadores para observar el mejoramiento sobre la CdV. Este razonamiento est&aacute; fundamentado en la influencia bien establecida de dichos factores, sobre los marcadores de la CdV, par&aacute;metros como la capacidad funcional, el estado psicol&oacute;gico y el bienestar social.</font></p>     <p><font size="2" face="Verdana"><i>Las Recomendaciones Diet&eacute;ticas</i></font></p>     <p><font size="2" face="Verdana">En la mayor&iacute;a de los casos, gran parte de los pacientes oncol&oacute;gicos se pueden beneficiar de recomendaciones diet&eacute;ticas generales y espec&iacute;ficas, para el control de su enfermedad o para el tratamiento relacionado con el control de los s&iacute;ntomas, manteniendo as&iacute; un adecuado estado nutricional y previniendo la malnutrici&oacute;n<sup>26,35</sup>.</font></p>     <p><font size="2" face="Verdana">Con dichas recomendaciones diet&eacute;ticas, se ha podido optimizar cualitativa y cuantitativamente la ingesta insuficiente de los pacientes que han recibido tratamiento de radioterapia por distintos tipos de c&aacute;ncer. Teniendo en cuenta, que la disminuci&oacute;n del apetito, la reducci&oacute;n de la ingesta y la p&eacute;rdida de peso tienen una influencia sobre la CdV<sup>35,36</sup>, las recomendaciones diet&eacute;ticas pudieron incrementar la CdV de los pacientes<sup>26</sup>. Esto mismo, ha quedado respaldado, en un estudio en pacientes con c&aacute;ncer de cabeza y cuello que recibieron recomendaciones diet&eacute;ticas, lo cual les permiti&oacute; incrementar su CdV, incluso obtuvieron mejores resultados que quienes recibieron &uacute;nicamente suplementos nutricionales orales sin recomendaciones diet&eacute;ticas<sup>24</sup>.</font></p>     <p><font size="2" face="Verdana">Sin embargo, considerando que la CdV puede definirse como: "esa brecha existente entre las expectativas personales y la actual experiencia individual"<sup>82</sup>, otra cuesti&oacute;n individual a considerar, m&aacute;s all&aacute; de la p&eacute;rdida de peso, y los s&iacute;ntomas relacionados con la nutrici&oacute;n, incluye los factores psicosociales y espirituales<sup>83</sup>, que pueden contribuir a determinar la CdV y por tanto, pueden minimizar los efectos de la intervenci&oacute;n nutricional sobre la CdV.</font></p>     <p><font size="2" face="Verdana">En otro estudio, con resultados similares al estudio anterior, demostr&oacute; en pacientes que han recibido radioterapia por c&aacute;ncer colorrectal<sup>27</sup>, que en aquellos que no recibieron tratamiento nutricional sufrieron un mayor deterioro en su CdV, mientras que en los pacientes que recibieron las recomendaciones diet&eacute;ticas, se obtuvieron mejores resultados.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La eficacia del tratamiento nutricional, mediante las recomendaciones diet&eacute;ticas, pretende el establecimiento y mejoramiento del estado nutricional y de la CdV. Pero depende de la habilidad para adaptar esta intervenci&oacute;n, a las necesidades y expectativas del paciente. Aportar estas recomendaciones diet&eacute;ticas dise&ntilde;adas para los pacientes oncol&oacute;gicos es un trabajo que requiere mucho tiempo y esfuerzo, y que debe manejarse a trav&eacute;s de equipos dedicados y especializados en la nutrici&oacute;n con un alto grado de entrenamiento en oncolog&iacute;a<sup>27</sup>.</font></p>     <p><font size="2" face="Verdana"><i>Los Suplementos Nutricionales Orales</i></font></p>     <p><font size="2" face="Verdana">La administraci&oacute;n de los suplementos nutricionales orales es una estrategia simple y no invasiva, que tiene como prop&oacute;sito incrementar la ingesta de nutrientes<sup>50</sup>que pueden darse a los pacientes cuando &eacute;stos requieren m&aacute;s aporte nutricional que no puede cubrirse solamente con recomendaciones diet&eacute;ticas<sup>50,84</sup>. Generalmente, en pacientes con enfermedades cr&oacute;nicas, la suplementaci&oacute;n oral se ha mostrado beneficiosa en t&eacute;rminos de funcionalidad f&iacute;sica y de ganancia de peso. Tambi&eacute;n en pacientes con un IMC (&Iacute;ndice de Masa Corporal) &lt; 20 kg/m<sup>2</sup> los beneficios han sido m&aacute;s pronunciados<sup>76</sup>.</font></p>     <p><font size="2" face="Verdana">El uso de los suplementos nutricionales que contienen nutrientes inmunomoduladores tales como: &aacute;cidos grasos poliinsaturados n-3 (&aacute;cido eicosapentanoico y&aacute;cido  docosahexanoico)<sup>75</sup>, arginina y nucle&oacute;tidos (RNA, DNA) han demostrado buenos resultados en términos del mejoramiento de la funci&oacute;n inmune<sup>58,59</sup>, reducci&oacute;n de la respuesta inflamatoria, mejoramiento de la funcionalidad intestinal<sup>52</sup> ycon una buena relaci&oacute;n coste-eficacia<sup>85</sup>. Incluso, la administraci&oacute;n de &eacute;stas f&oacute;rmulas puede contribuir al mejoramiento del estado nutricional<sup>86</sup>.</font></p>     <p><font size="2" face="Verdana">El papel que desempe&ntilde;an los &aacute;cidos grasos n-3 fue evaluada en un estudio piloto que involucraba pacientes con c&aacute;ncer de pulm&oacute;n y de p&aacute;ncreas. En el cual, los pacientes recibieron recomendaciones diet&eacute;ticas y suplementos nutricionales orales enriquecidos con&aacute;cidos grasos n-3, obteniendo como resultado un mejoramiento en su CdV<sup>87</sup>. Otro estudio en pacientes con c&aacute;ncer avanzado de p&aacute;ncreas, los suplementos nutricionales orales enriquecidos con &aacute;cidos grasos n-3, permitieron estabilizar el peso corporal, mejorar la CdV y prolongar la supervivencia, al menos durante el poco tiempo que duro el estudio<sup>60</sup>.</font></p>     <p><font size="2" face="Verdana">Tambi&eacute;n, en pacientes en estado de caquexia, se ha demostrado que la administraci&oacute;n prolongada de &aacute;cidos grasos n-3, puede incrementar el peso corporal, asociado a un significativo aumento de la masa muscular<sup>25</sup>.&Eacute;ste efecto est&aacute; relacionado con la mediaci&oacute;n de los &aacute;cidos grasos n-3 para inhibir la expresi&oacute;n de mediadores proinflamatorios<sup>3</sup>. Los &aacute;cidos grasos n-3 est&aacute;n relacionados con la ganancia de peso, la cual ha sido paralelamente relacionada con el mejoramiento de la CdV, que puede ser explicada debido al incremento de la actividad f&iacute;sica que se induce y que se considera como un par&aacute;metro que tiene una influencia directa sobre la CdV<sup>88</sup>.</font></p>     <p><font size="2" face="Verdana">Sin embargo, otros estudios muestran que la suplementaci&oacute;n con &aacute;cidos grasos n-3 estabiliza la CdV de la misma manera como lo alcanza el tratamiento farmacol&oacute;gico con acetato de megestrol<sup>89</sup>. Incluso, se ha documentado que la administraci&oacute;n del &aacute;cido eicosapentaenoico en forma pura como dietil &eacute;ster, mejora los resultados de la funci&oacute;n f&iacute;sica en pacientes caqu&eacute;cticos, pero no se afectan otros marcadores de la CdV<sup>90</sup>.</font></p>     <p><font size="2" face="Verdana">El mecanismo de acci&oacute;n de los &aacute;cidos grasos n-3 se basa sobre la habilidad para bloquear la respuesta de fase aguda, asociada con el crecimiento del tumor. Este efecto es el responsable del incremento de la supervivencia y la reducci&oacute;n de la p&eacute;rdida de peso. Pero la suplementaci&oacute;n oral de &aacute;cidos grasos n-3, requiere un tiempo m&iacute;nimo de 3 semanas, con una dosis adecuada para alcanzar suficientes concentraciones para poder inducir efectos a nivel bioqu&iacute;mico, molecular e intracelular, y de esta manera poder estabilizar el peso corporal<sup>91</sup>.</font></p>     <p><font size="2" face="Verdana">Podemos considerar, que la malnutrici&oacute;n puede revertirse mediante suplementos nutricionales orales<sup>6</sup>, pero &eacute;stos no pueden impedir el desarrollo del s&iacute;ndrome de caquexia, aunque si pueden mitigar el proceso<sup>25</sup>. Sin embargo, se requiere el desarrollo de futuras investigaciones con &aacute;cidos grasos n-3, para identificar su eficacia en distintos tipos de pacientes con c&aacute;ncer<sup>15</sup>. Al igual, que identificar su papel y &eacute;l de otros nutrientes (como: la Vitamina E) para ser explorados como nutrientes aislados o en combinaci&oacute;n con otros<sup>92-94</sup>.</font></p>     <p><font size="2" face="Verdana"><i>La Nutrici&oacute;n Enteral</i></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Las f&oacute;rmulas de NE son administradas por medio de sondas de alimentaci&oacute;n, g&aacute;stricas o intestinales, en pacientes quienes no pueden cubrir sus requerimientos nutricionales mediante ingesta oral<sup>95</sup>. Las f&oacute;rmulas est&aacute;ndar polim&eacute;ricas son generalmente adecuadas para los pacientes oncol&oacute;gicos<sup>96</sup>. El uso de esta modalidad nutricional, permite la correcci&oacute;n del estado nutricional, preservando la funcionalidad intestinal<sup>97,98</sup>. Debido al uso del tracto gastrointestinal, la nutrici&oacute;n enteral es m&aacute;s fisiol&oacute;gica que la NPT, contribuye al mantenimiento de la respuesta inmune<sup>53,75,97</sup>, se puede reducir el costo hospitalario, y tambi&eacute;n se puede disminuir el riesgo de infecci&oacute;n si se compara con la NPT<sup>99</sup>.</font></p>     <p><font size="2" face="Verdana">En pacientes malnutridos con c&aacute;ncer gastrointestinal, sometidos a cirug&iacute;a mayor, se observ&oacute; que la tasa de complicaciones y la duraci&oacute;n de la estancia hospitalaria fueron significativamente reducidas, mediante la administraci&oacute;n temprana de una nutrici&oacute;n enteral postoperatoria, comparada con quienes recibieron NPT. Sin embargo, en el mismo estudio se encontr&oacute; que los pacientes con NPT tuvieron menos s&iacute;ntomas gastrointestinales que los que recibieron NE<sup>51</sup>.</font></p>     <p><font size="2" face="Verdana">En otros pacientes, con c&aacute;ncer de es&oacute;fago elegidos para recibir una cirug&iacute;a curativa, la NE se asoci&oacute; con mejor&iacute;a del estado nutricional y se observ&oacute; que se redujeron las complicaciones respiratorias postoperatorias<sup>100</sup>.</font></p>     <p><font size="2" face="Verdana">En pacientes que han sido sometidos a cirug&iacute;a (resecci&oacute;n del c&aacute;ncer g&aacute;strico o de p&aacute;ncreas), la comparaci&oacute;n entre NE est&aacute;ndar, NE enriquecida en inmunonutrientes (arginina, &aacute;cidos grasos n-3 y nucle&oacute;tidos) y NPT; se document&oacute; que la NE fue la m&aacute;s apropiada en t&eacute;rminos de evitar complicaciones cardiopulmonares y dehiscencias anastom&oacute;ticas. Se observ&oacute; tambi&eacute;n que la NE enriquecida redujo adem&aacute;s la tasa de infecci&oacute;n aproximadamente un 50% comparada con la NE est&aacute;ndar o la NPT. Incluso se asoci&oacute; con una reducci&oacute;n en la estancia hospitalaria y la severidad de las infecciones<sup>75</sup>.</font></p>     <p><font size="2" face="Verdana">Las f&oacute;rmulas que contienen, &aacute;cidos grasos n-3, arginina y nucle&oacute;tidos han demostrado que pueden mejorar la respuesta del sistema inmunol&oacute;gico y contribuir a la cicatrizaci&oacute;n de las heridas<sup>101</sup>. La administraci&oacute;n postoperatoria de dicha f&oacute;rmula a pacientes gastrectomizados por c&aacute;ncer, increment&oacute; la s&iacute;ntesis de col&aacute;geno y mejor&oacute; la cicatrizaci&oacute;n. Esto puede ser resultado de la reducci&oacute;n general y significativa de la morbilidad y del n&uacute;mero de infecciones postoperatorias<sup>101</sup>.</font></p>     <p><font size="2" face="Verdana">Cuando la misma f&oacute;rmula se administr&oacute; en forma perioperatoria a pacientes malnutridos con c&aacute;ncer a los que se les practic&oacute; una cirug&iacute;a a nivel gastrointestinal. Se evidenci&oacute; una mejor&iacute;a cl&iacute;nica, pero dichos beneficios se observaron en mayor medida, que cuando la f&oacute;rmula se administr&oacute; solamente en la fase postoperatoria. En t&eacute;rminos de disminuci&oacute;n de la estancia hospitalaria, de la antibioterapia, as&iacute; como de la reducci&oacute;n de las complicaciones postoperatorias, y obteni&eacute;ndose como resultado final una reducci&oacute;n del coste hospitalario<sup>53</sup>.</font></p>     <p><font size="2" face="Verdana">Por otra parte, los efectos de la administraci&oacute;n preoperatoria de una f&oacute;rmula enriquecida (arginina y &aacute;cidos n-3), de una f&oacute;rmula est&aacute;ndar administrada tambi&eacute;n en forma preoperatoria, otra administrada en forma postoperatoria, tambi&eacute;n enriquecida (v&iacute;a infusi&oacute;n yeyunal), y la no suplementaci&oacute;n, se han investigado en pacientes adecuadamente nutridos que han sufrido una resecci&oacute;n colorrectal por c&aacute;ncer. Los resultados de este estudio, indican que existe un beneficio significativo cuando se administra la f&oacute;rmula enriquecida, ya sea en forma pre y postoperatoria. La tasa de infecci&oacute;n y la duraci&oacute;n de la antibioterapia se reducen a la vez que la estancia hospitalaria e incluso, se mejoran los resultados cl&iacute;nicos de la cirug&iacute;a<sup>52</sup>. Este estudio es de particular inter&eacute;s, ya que sugiri&oacute; que la intervenci&oacute;n nutricional puede tambi&eacute;n beneficiar a los pacientes con c&aacute;ncer que no se encuentran malnutridos. Ahondando en el concepto de dar soporte metab&oacute;lico a los pacientes con c&aacute;ncer, y no solo el mero concepto de soporte nutricional. De hecho, aunque las evidencias cl&iacute;nicas son indiscutibles, a&uacute;n falta evidenciar que los nutrientes espec&iacute;ficos con propiedades farmacol&oacute;gicas "nutrac&eacute;uticos", puedan ser sistem&aacute;ticamente administrados a los pacientes con c&aacute;ncer independiente del estado nutricional, con el objetivo de influenciar positivamente la respuesta metab&oacute;lica con su esperado efecto cl&iacute;nico (por ejemplo: la inhibici&oacute;n de la prot&eacute;olisis muscular mediante &aacute;cidos grasos n-3&rarr; mejora la funcionalidad f&iacute;sica &rarr; mejora la CdV).</font></p>     <p><font size="2" face="Verdana">Sin embargo, diferentes resultados se han observado cuando se compararon los efectos de una f&oacute;rmula enriquecida con arginina con los de una f&oacute;rmula est&aacute;ndar en pacientes que tuvieron una intervenci&oacute;n quir&uacute;rgica por c&aacute;ncer de cabeza y cuello. No encontr&aacute;ndose diferencias significativas entre los grupos en cuanto a los niveles circulantes de los marcadores de inflamaci&oacute;n [como: interleuquina 6 y prote&iacute;na C-reactiva], los cuales estuvieron reducidos en ambos grupos<sup>102</sup>.</font></p>     <p><font size="2" face="Verdana">De manera similar, la CdV de pacientes con c&aacute;ncer de cabeza y cuello severamente malnutridos se pudo mejorar durante el per&iacute;odo que precedi&oacute; la cirug&iacute;a, mediante la administraci&oacute;n perioperativa de una f&oacute;rmula de NE tanto est&aacute;ndar como enriquecida con arginina<sup>29</sup>.</font></p>     <p><font size="2" face="Verdana">En otro estudio, en los pacientes con c&aacute;ncer orofar&iacute;ngeo tratados mediante radioterapia, se pudo prevenir la p&eacute;rdida de peso y reducir la frecuencia de admisiones hospitalarias, con una pronta intervenci&oacute;n nutricional, mediante la colocaci&oacute;n de una sonda de gastrostom&iacute;a endosc&oacute;pica percut&aacute;nea (PEG). Se consider&oacute; en este estudio, que debido a la influencia que tiene el tiempo de estancia hospitalaria sobre la CdV, en este caso, puede asumirse que &eacute;sta pudo haberse mejorado<sup>56</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><i>La Nutrici&oacute;n Parenteral</i></font></p>     <p><font size="2" face="Verdana">La nutrici&oacute;n parenteral total (NPT) es una t&eacute;cnica eficiente de soporte nutricional, pero que &eacute;sta acompa&ntilde;ada de riesgos espec&iacute;ficos [tales como: hiperglucemia, sepsis por cat&eacute;ter ...<sup>99</sup>] y de un alto costo. Sin embargo, se emplea &uacute;nicamente cuando la NE no es posible<sup>103</sup>, debido a que no se puede disponer del tracto gastrointestinal o de una disfunci&oacute;n inevitable<sup>77</sup>, que puede incluir una malabsorci&oacute;n severa, una f&iacute;stula de alto d&eacute;bito, dismotilidad o dolor abdominal.</font></p>     <p><font size="2" face="Verdana">En pacientes con tumores s&oacute;lidos y tumores hematol&oacute;gicos malignos que han recibido trasplante de m&eacute;dula&oacute;sea (TMO), la NPT es frecuentemente la &uacute;nica posibilidad para dar soporte nutricional a &eacute;stos pacientes<sup>77,104</sup>. Debido a que la toxicidad asociada a las terapias relacionadas con TMO, las cuales pueden potenciar una mucositis severa, en la que la NE es usualmente poco tolerada. Sin embargo, tambi&eacute;n se ha considerado el uso de la NPT enriquecida con glutamina y/o &aacute;cidos grasos n-3, que se han relacionado con mejores resultados en t&eacute;rminos de funci&oacute;n inmune, balance nitrogenado, incidencia de complicaciones, supervivencia y estancia hospitalaria<sup>77</sup>.</font></p>      <p><font size="2" face="Verdana">En otro tipo de pacientes malnutridos con c&aacute;ncer avanzado e incurable, que recibieron un soporte nutricional oral y enteral intensificado, se document&oacute; que en los pacientes que luego recibieron suplementaci&oacute;n con nutrici&oacute;n parenteral, se observ&oacute; una reducci&oacute;n de la p&eacute;rdida progresiva de peso, una mejor&iacute;a de la composici&oacute;n corporal, y del apetito, menos anorexia, mejor&iacute;a de la supervivencia y de la CdV<sup>37</sup>.</font></p>     <p><font size="2" face="Verdana">En este sentido, en pacientes con c&aacute;ncer de tracto digestivo alto<sup>105</sup> y en pacientes con c&aacute;ncer avanzado la NPT puede ser ventajosa cuando es usada con prudencia<sup>106</sup>. Sin embargo, este un tema controvertido, y especialmente en el c&aacute;ncer incurable y en enfermedades metast&aacute;sicas<sup>107</sup>. Aunque, en c&aacute;nceres avanzados digestivos o c&aacute;nceres ginecol&oacute;gicos con met&aacute;stasis, suelen asociarse a obstrucciones del tracto digestivo, y la supervivencia est&aacute; dependiendo solamente del soporte nutricional, y la NPT es imprescindible<sup>108</sup>. En este caso, los pacientes pueden ser remitidos a su domicilio, para recibir all&iacute; la asistencia y los cuidados que requieren, incluyendo la nutrici&oacute;n parenteral (NPD)<sup>109</sup>. Cabe mencionar, las contraindicaciones ya conocidas de NPD<sup>110</sup>.</font></p>     <p><font size="2" face="Verdana">Un estudio realizado en pacientes con c&aacute;ncer avanzado, severamente malnutridos y casi af&aacute;gicos, la NPD ha demostrado mantener el estado nutricional hasta la muerte, mientras la CdV permanec&iacute;a estable 2-3 meses antes de que esta finalmente se produjera<sup>32</sup>.</font></p>     <p><font size="2" face="Verdana">En pacientes que padecen c&aacute;ncer avanzado metast&aacute;tico, tumores carcinoides o tumores de las c&eacute;lulas de los islotes, carcinoma ov&aacute;rico o amiloidosis, que han sido tratados nutricionalmente con NPD, se document&oacute; mejor&iacute;a de la CdV, especialmente cuando se ha administrado en forma postoperatoria y cuando los cuidados continuos fueron requeridos debido a drenajes quir&uacute;rgicos o por heridas abiertas. Sin embargo, en este an&aacute;lisis se recomend&oacute; m&aacute;s estudios para evaluar los efectos de la NPD, en pacientes con distintos tipos de c&aacute;ncer<sup>107</sup>.</font></p>     <p><font size="2" face="Verdana">Una mejor estimaci&oacute;n del impacto de la NPD sobre la CdV de los pacientes ha sido recientemente reportada en pacientes con un c&aacute;ncer avanzado, la mayor&iacute;a de ellos estaban diagnosticados de adenocarcinoma gastrointestinal y cerca del 50% de los pacientes incluidos en el estudio estuvieron recibiendo tratamiento paliativo de quimioterapia. Sus familias fueron entrevistadas sobre la experiencia con la NPD, y basados en sus respuestas, parece que los pacientes y sus familias asocian las NPD con beneficios, tales como: ganancia del peso corporal, incremento de la energ&iacute;a, de la fuerza y de los niveles de actividad, adem&aacute;s de la seguridad por el hecho de cubrir sus necesidades nutricionales. Por tanto, &eacute;stos efectos podr&iacute;an extrapolarse con una mejor&iacute;a de la CdV<sup>33</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Conclusi&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">El c&aacute;ncer altera profundamente las funciones f&iacute;sicas, el bienestar psicol&oacute;gico y la vida social de los pacientes. Durante la fase aguda del tratamiento oncol&oacute;gico con intenci&oacute;n curativa un adecuado soporte nutricional ha mostrado un mejoramiento de los resultados a corto plazo mediante la reducci&oacute;n del n&uacute;mero de complicaciones, as&iacute; como de la disminuci&oacute;n de la fase de recuperaci&oacute;n. Esta mejor&iacute;a cl&iacute;nica ha tenido un impacto positivo sobre la CdV. En la evoluci&oacute;n a largo plazo hasta la recuperaci&oacute;n completa de la salud o reca&iacute;da de la enfermedad, esta mejor&iacute;a del estado nutricional est&aacute; estrechamente relacionada a una mejor percepci&oacute;n del estado de salud y de la propia percepci&oacute;n del bienestar.</font></p>     <p><font size="2" face="Verdana">En los pacientes con tratamiento paliativo, el soporte nutricional ante todo se enfoca, en la minimizaci&oacute;n de los s&iacute;ntomas relacionados con la ingesta de alimentos, y posponiendo la p&eacute;rdida de autonom&iacute;a. Por tanto, el soporte nutricional debe estar integrado dentro del cuidado global oncol&oacute;gico, por su significativa contribuci&oacute;n a la CdV. Adem&aacute;s, la evaluaci&oacute;n de la CdV debe ser parte de la evaluaci&oacute;n de cualquier intervenci&oacute;n nutricional para optimizar la adecuaci&oacute;n a las necesidades y expectativas del paciente.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><B>Referencias</B></font></p>     <!-- ref --><p><font size="2" face="Verdana">1. Delano M. J., Moldawer, L. L. The origins of cachexia in acute and chronic inflammatory diseases. Nutr Clin Pract 2006; 21:68-81.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3522301&pid=S0212-1611200700040000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Fearon KC, Moses AG. Cancer cachexia. Int J Cardiol 2002; 85:73-81.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3522302&pid=S0212-1611200700040000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3. Laviano A, Meguid MM, Inui A, Muscaritoli M, Rossi-Fanelli F. Therapy insight: cancer anorexia-cachexia syndrome-when all you can eat is yourself. Nat Clin Pract Oncol 2005; 2: 158-165.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3522303&pid=S0212-1611200700040000800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>4. Bosaeus I, Daneryd P, Svanberg E, Lundholm K. 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<body><![CDATA[<p><font size="2" face="Verdana">Recibido: 12-II-2007.    <br>Aceptado: 26-II-2007.</font></p>      ]]></body><back>
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