<?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>0188-2198</journal-id>
<journal-title><![CDATA[Revista mexicana de cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cardiol]]></abbrev-journal-title>
<issn>0188-2198</issn>
<publisher>
<publisher-name><![CDATA[Asociación Nacional de Cardiólogos de México, Sociedad de Cardiología Intervencionista de México]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-21982015000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síndrome cardiorrenal: Nuevas perspectivas]]></article-title>
<article-title xml:lang="en"><![CDATA[Cardiorenal syndrome: New perspectives]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-López]]></surname>
<given-names><![CDATA[Ernesto Lenin]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alemán-Ortiz]]></surname>
<given-names><![CDATA[Omar Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nando-Villicaña]]></surname>
<given-names><![CDATA[Claudia Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosas-Munive]]></surname>
<given-names><![CDATA[Emma]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Secretaría de Salud Hospital General de México Servicio de Nefrología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Secretaría de Salud Hospital General de México ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Secretaría de Salud Hospital General de México Servicio de Cardiología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2015</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>39</fpage>
<lpage>52</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-21982015000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-21982015000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-21982015000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La disfunción cardiaca y la renal coexisten con alta prevalencia. Se ha definido a esta entidad clínica como síndrome cardiorrenal y una de sus características principales es la resistencia al tratamiento. Se han descrito múltiples hipótesis para explicar su fisiopatología, como la desregulación hemodinámica y, recientemente, mecanismos neurohumorales e inmunológicos que intervienen en su desarrollo y perpetuación. Se clasifica de acuerdo con su forma de presentación y componentes fisiopatológicos. Existen distintos enfoques terapéuticos para controlar o limitar el progreso de la enfermedad. Esta revisión discute y analiza la información actual sobre la fisiopatología, la clasificación y el tratamiento de esta entidad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[There is a high prevalence of heart failure associated to kidney failure or viceversa. This association has been defined as a clinical entity: cardiorenal syndrome and one of its main characteristics is the resistance to treatment. Multiple hypotheses have been proposed to explain the pathophysiology of this syndrome, such as hemodynamic deregulation and recently, other neurohormonal and immunological mechanisms involved in the development and perpetuation of this pathology. Classifications have been based on the form of presentation or physiopathological manifestations. Different therapeutic approaches have been proposed to control or limit the progress of this disease. This review discusses and analyzes the current information on pathophysiology, different classifications and treatment.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome cardiorrenal]]></kwd>
<kwd lng="es"><![CDATA[insuficiencia cardiaca]]></kwd>
<kwd lng="es"><![CDATA[insuficiencia renal]]></kwd>
<kwd lng="en"><![CDATA[Cardiorenal syndrome]]></kwd>
<kwd lng="en"><![CDATA[heart dysfunction]]></kwd>
<kwd lng="en"><![CDATA[kidney failure]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Trabajo de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>S&iacute;ndrome cardiorrenal: Nuevas perspectivas</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Cardiorenal syndrome: New perspectives</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Ernesto Lenin Ch&aacute;vez-L&oacute;pez,&#42; Omar Felipe Alem&aacute;n-Ortiz,&#42;&#42; Claudia Carolina Nando-Villica&ntilde;a,&#42;&#42; Emma Rosas-Munive&#42;&#42;&#42;</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">&#42; Servicio de Nefrolog&iacute;a.    <br>&#42;&#42; Interno de Pregrado, Facultad de Ciencias de la Salud, Universidad An&aacute;huac M&eacute;xico Norte.    ]]></body>
<body><![CDATA[<br>&#42;&#42;&#42; Servicio de Cardiolog&iacute;a.    <br>    <br>Hospital General de M&eacute;xico, Secretar&iacute;a de Salud.</font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Direcci&oacute;n para correspondencia:</i>    <br><b>Omar Felipe Alem&aacute;n-Ortiz</b>    <br>Venustiano Carranza N&uacute;m. 23 bis,    <br>Col. Cuautepec Barrio Alto, M&eacute;xico, D.F.    <br>Tel: 2227-0009    <br>E-mail: <a href="mailto:faleman.o@gmail.com" target="_blank">faleman.o@gmail.com</a></font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b> </font></p>     <p align="justify"><font face="verdana" size="2">La disfunci&oacute;n cardiaca y la renal coexisten con alta prevalencia. Se ha definido a esta entidad cl&iacute;nica como s&iacute;ndrome cardiorrenal y una de sus caracter&iacute;sticas principales es la resistencia al tratamiento. Se han descrito m&uacute;ltiples hip&oacute;tesis para explicar su fisiopatolog&iacute;a, como la desregulaci&oacute;n hemodin&aacute;mica y, recientemente, mecanismos neurohumorales e inmunol&oacute;gicos que intervienen en su desarrollo y perpetuaci&oacute;n. Se clasifica de acuerdo con su forma de presentaci&oacute;n y componentes fisiopatol&oacute;gicos. Existen distintos enfoques terap&eacute;uticos para controlar o limitar el progreso de la enfermedad. Esta revisi&oacute;n discute y analiza la informaci&oacute;n actual sobre la fisiopatolog&iacute;a, la clasificaci&oacute;n y el tratamiento de esta entidad.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>S&iacute;ndrome cardiorrenal, insuficiencia cardiaca, insuficiencia renal.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>     <p align="justify"><font face="verdana" size="2">There is a high prevalence of heart failure associated to kidney failure or viceversa. This association has been defined as a clinical entity: cardiorenal syndrome and one of its main characteristics is the resistance to treatment. Multiple hypotheses have been proposed to explain the pathophysiology of this syndrome, such as hemodynamic deregulation and recently, other neurohormonal and immunological mechanisms involved in the development and perpetuation of this pathology. Classifications have been based on the form of presentation or physiopathological manifestations. Different therapeutic approaches have been proposed to control or limit the progress of this disease. This review discusses and analyzes the current information on pathophysiology, different classifications and treatment.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Cardiorenal syndrome, heart dysfunction, kidney failure.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La correlaci&oacute;n entre la falla renal y la cardiaca tiene una alta prevalencia; sin embargo, hasta apenas a&ntilde;os recientes se ha reconocido. En 2004, el <i>National Heart Lung and Blood Institute</i> acu&ntilde;a el t&eacute;rmino s&iacute;ndrome cardiorrenal (SCR) y lo define como la extrema desregulaci&oacute;n cardiaca y renal, lo que conduce a una entidad sindrom&aacute;tica en la que el tratamiento para aliviar los s&iacute;ntomas congestivos de la insuficiencia cardiaca (IC) se ve limitado por la marcada disfunci&oacute;n renal.<sup>1</sup> Ronco y colaboradores establecieron en 2008 una clasificaci&oacute;n basada en la disfunci&oacute;n org&aacute;nica inicial y la temporalidad.<sup>2</sup> Recientemente, Hatamizadeh y colaboradores propusieron la relaci&oacute;n bidireccional del da&ntilde;o a trav&eacute;s de v&iacute;as hemodin&aacute;micas, neurohumorales e inmunol&oacute;gicas,<sup>3</sup> interacci&oacute;n respaldada por estudios recientes (<a href="#a6f1" target="_self">Figura 1</a>).<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p><a name="a6f1"></a></p>    <p>&nbsp;</p>    <p align="center"><img src="../img/revistas/rmc/v26n1/a6f1.jpg"></p>    <p>&nbsp;</p>    <p><font size="2" face="Verdana"></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>EPIDEMIOLOG&Iacute;A</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Insuficiencia cardiaca</b></font></p>     <p align="justify"><font face="verdana" size="2">La prevalencia de IC en los Estados Unidos es cercana al 10% en personas mayores de 65 a&ntilde;os y en pacientes con m&aacute;s de 40 a&ntilde;os la probabilidad de desarrollarla aumenta hasta 20%.<sup>5-8</sup> Esta tendencia aument&oacute; en las &uacute;ltimas d&eacute;cadas en pa&iacute;ses desarrollados,<sup>9,10</sup> probablemente por la alta frecuencia de hipertensi&oacute;n arterial sist&eacute;mica (HAS), mayor supervivencia de los pacientes con infarto agudo del miocardio (IAM) y el aumento de la poblaci&oacute;n anciana.<sup>11</sup> Se estima que 30% de los pacientes ingresados por insuficiencia cardiaca descompensada (ICD) tienen antecedente de enfermedad renal cr&oacute;nica (ERC), 21% tiene elevaci&oacute;n de creatinina de &gt; 2.0 mg/dL y hasta 9% m&aacute;s de 3.0 mg/dL.<sup>6</sup> Los componentes cl&iacute;nicos asociados con riesgo de desarrollar ICD son: la edad &ge; 75 a&ntilde;os, HAS (72%), fracci&oacute;n de expulsi&oacute;n del ventr&iacute;culo izquierdo (FEVI) &lt; 40% (59%), cardiopat&iacute;a coronaria (57%), sexo femenino (52%), diabetes mellitus (DM) (44%), fibrilaci&oacute;n auricular (31%) y, como rasgo importante, ERC en el 30% de los casos; 30 a 50% pueden tener FEVI conservada, caracter&iacute;stica m&aacute;s frecuente en ancianos y mujeres, sobre todo si se asocia con la obesidad, ERC, DM, enfermedad pulmonar obstructiva cr&oacute;nica (EPOC) y cardiopat&iacute;a coronaria, con pron&oacute;stico similar a la IC por disfunci&oacute;n sist&oacute;lica.<sup>12-14</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las enfermedades del coraz&oacute;n ocupan los primeros lugares de mortalidad a nivel mundial, siendo la IC una causa directa. En M&eacute;xico no se cuenta con datos precisos, aunque de acuerdo con la Encuesta Nacional de Salud 2012 (ENSANUT 2012), la prevalencia de HAS se ha mantenido constante en los &uacute;ltimos seis a&ntilde;os.<sup>15</sup> La frecuencia de IC es dif&iacute;cil de estimar por falta de informaci&oacute;n epidemiol&oacute;gica; sin embargo, un estudio multic&eacute;ntrico, realizado en 2004, revel&oacute; que las dos causas m&aacute;s frecuentes de IC son HAS y cardiopat&iacute;a isqu&eacute;mica. En este estudio, 44.9% de los individuos ten&iacute;an DM y en 33% de los casos de IC sist&oacute;lica la FEVI era &lt; 30%.<sup>16</sup></font></p>     <p align="justify"><font face="verdana" size="2">La disfunci&oacute;n renal es una patolog&iacute;a com&uacute;nmente asociada a pacientes con IC, report&aacute;ndose una prevalencia de 36 a 50% y hasta 25% de pacientes con insuficiencia renal cr&oacute;nica (IRC) presentan alg&uacute;n grado de IC; la frecuencia aumenta en pacientes que inician di&aacute;lisis.<sup>17-19</sup> Puede adem&aacute;s presentarse da&ntilde;o renal agudo durante la descompensaci&oacute;n de IC.<sup>20</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Insuficiencia renal cr&oacute;nica</b></font></p>     <p align="justify"><font face="verdana" size="2">La prevalencia de personas con alg&uacute;n grado de ERC en los EUA es cuando menos de 10% en mayores de 20 a&ntilde;os. La disminuci&oacute;n en la tasa de filtrado glomerular (TFG) a menos de 60 mL/min est&aacute; asociada con incremento gradual de todas las causas de mortalidad. Asimismo, la proteinuria, desde niveles de microalbuminuria, se asocia con mayor incidencia de eventos cardiovasculares<sup>21</sup> y, de manera general, cualquier grado de ERC se relaciona firmemente con la presentaci&oacute;n de eventos coronarios,<sup>22</sup> incluso m&aacute;s que la DM aislada.<sup>23</sup> Estudios abiertos han confirmado esta asociaci&oacute;n.<sup>24</sup></font></p>     <p align="justify"><font face="verdana" size="2">Estudios epidemiol&oacute;gicos ubican a M&eacute;xico como el pa&iacute;s de mayor incidencia global de ERC.<sup>25</sup> El estudio de tamizaje para ERC en poblaciones adultas de riesgo m&aacute;s importante (<i>Kidney Early Evaluation Program</i>, KEEP) se realiz&oacute; en sujetos con DM, HAS e historia familiar de ERC y encontr&oacute; prevalencia de hasta 33%, con m&aacute;s de 70% en estadios 1 y 2 de la enfermedad.<sup>26</sup> El seguimiento muestra una incidencia de 14% en estos grupos.<sup>2</sup> En pacientes con terapias de remplazo renal la supervivencia es pobre (menor a 50% en el primer a&ntilde;o), como se demostr&oacute; en series realizadas en Jalisco, M&eacute;xico.<sup>28</sup></font></p>     <p align="justify"><font face="verdana" size="2">La ERC implica la convergencia entre factores de riesgo cardiovascular tradicionales y no tradicionales (uremia, anemia, hiperfosfatemia, hiperparatiroidismo secundario, calcificaciones coronarias y valvulares, hiperhomocisteinemia, inflamaci&oacute;n e incremento del estr&eacute;s oxidativo).<sup>7,23,24</sup> La coexistencia de ateroesclerosis acelerada y calcificaci&oacute;n vascular implica un perfil cardiovascular desfavorable.<sup>29</sup> Adicionalmente, se ha identificado alguna forma de cardiopat&iacute;a hasta en 80% de los pacientes sometidos a hemodi&aacute;lisis,<sup>30</sup> y en relaci&oacute;n a estos fen&oacute;menos, una alta incidencia de muerte s&uacute;bita de origen cardiaco.<sup>31</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">  <b>CLASIFICACI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">La relaci&oacute;n bidireccional del da&ntilde;o, la mutua interacci&oacute;n de ambos &oacute;rganos en la regulaci&oacute;n hemodin&aacute;mica y el conocimiento de que existen otros mecanismos en el desarrollo del s&iacute;ndrome, le confieren gran complejidad. En 2008, Ronco y colaboradores clasificaron al SCR en cinco entidades fisiopatol&oacute;gicas.<sup>4</sup> Recientemente, Hatamizadeh y colaboradores hicieron una propuesta basada en las manifestaciones cl&iacute;nicas m&aacute;s importantes (<a href="../img/revistas/rmc/v26n1/a6t1.jpg" target="_blank">Cuadro I</a>).<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>SCR tipo 1: s&iacute;ndrome cardiorrenal agudo</b></font></p>     <p align="justify"><font face="verdana" size="2">El SCR tipo 1 se caracteriza por un r&aacute;pido compromiso de la funci&oacute;n cardiaca que genera lesi&oacute;n renal aguda (LRA). Puede ser dividido en cuatro subgrupos cl&iacute;nicos: edema pulmonar hipertensivo con funci&oacute;n ventricular izquierda sist&oacute;lica preservada, falla cardiaca descompensada aguda o cr&oacute;nica, insuficiencia ventricular derecha y choque cardiog&eacute;nico.<sup>32</sup> Los mecanismos de lesi&oacute;n son m&uacute;ltiples y complejos<sup>33</sup> y su importancia radica en la repercusi&oacute;n cl&iacute;nica y su abordaje.</font></p>     <p align="justify"><font face="verdana" size="2">La LRA es m&aacute;s grave en pacientes con fracci&oacute;n de expulsi&oacute;n deprimida, alcanzando una incidencia de 70% en choque cardiog&eacute;nico.<sup>34</sup> La funci&oacute;n renal es un factor de riesgo independiente para mortalidad a un a&ntilde;o.<sup>35</sup> Este cambio tambi&eacute;n acelera la patolog&iacute;a cardiovascular por activaci&oacute;n de v&iacute;as inflamatorias.<sup>36</sup> El principio cl&iacute;nico b&aacute;sico es la LRA por hipoperfusi&oacute;n, perpetuado por la asociaci&oacute;n de bajo gasto cardiaco y aumento marcado en la presi&oacute;n venosa que resulta en congesti&oacute;n renal.</font></p>     <p align="justify"><font face="verdana" size="2">La segunda alteraci&oacute;n importante es la disminuci&oacute;n de la respuesta a diur&eacute;ticos como consecuencia de la retenci&oacute;n de sodio a nivel distal<sup>37</sup> y postdiur&eacute;tico.<sup>38</sup> En algunos pacientes, el volumen sist&oacute;lico no aumenta y la taquicardia sustenta la adecuaci&oacute;n del gasto cardiaco. El bloqueo de estos mecanismos y la compensaci&oacute;n inotr&oacute;pico-dependiente puede precipitar el choque cardiog&eacute;nico.<sup>39</sup></font></p>     <p align="justify"><font face="verdana" size="2">El diagn&oacute;stico precoz de la LRA sigue siendo un desaf&iacute;o. Existen marcadores cl&aacute;sicos como el aumento de la creatinina, pero esto se establece hasta 48 horas despu&eacute;s de iniciado el da&ntilde;o.<sup>40</sup> El desarrollo de nuevos biomarcadores ha dado una nueva pauta, pues pueden preceder al incremento en la creatinina, e incluso, tener implicaci&oacute;n pron&oacute;stica, como ejemplo la lipocalina asociada con la gelatinasa de neutr&oacute;filos (NGAL).<sup>41,42</sup> La cistatina C parece ser un mejor marcador en ERC.<sup>43</sup> Ambos pueden predecir LRA a las 12 horas, aunque la NGAL super&oacute; a la cistatina C en determinaci&oacute;n/tiempo.</font></p>     <p align="justify"><font face="verdana" size="2">Otros marcadores como la N-acetil-glucosaminidasa<sup>44</sup> y la interleucina 18 (IL-18)<sup>45</sup> se han propuesto como marcadores tempranos y de gravedad.</font></p>     <p align="justify"><font face="verdana" size="2"><b>SCR tipo 2: s&iacute;ndrome cardiorrenal cr&oacute;nico</b></font></p>     <p align="justify"><font face="verdana" size="2">El SCR tipo 2 se presenta como IC congestiva cr&oacute;nica que causa en forma progresiva y potencialmente permanente ERC, entidad de mal pron&oacute;stico en edad avanzada, HAS, DM y s&iacute;ndrome isqu&eacute;mico coronario agudo (SICA).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Es probable que la IC cr&oacute;nica genere a largo plazo hipoperfusi&oacute;n renal y sobreexpresi&oacute;n de vasoconstrictores (epinefrina, angiotensina, endotelina) con disminuci&oacute;n de la sensibilidad y la liberaci&oacute;n de vasodilatadores end&oacute;genos (p&eacute;ptidos natriur&eacute;ticos, &oacute;xido n&iacute;trico). La hipovolemia, la introducci&oacute;n temprana de bloqueo del sistema renina-angiotensina-aldosterona (S-RAA), la acci&oacute;n de los diur&eacute;ticos y la hipotensi&oacute;n se han sugerido como promotores del s&iacute;ndrome.<sup>46</sup> La deficiencia de eritropoyetina y la activaci&oacute;n de su receptor pueden promover apoptosis, fibrosis e inflamaci&oacute;n cardiaca.<sup>47,48</sup> Los agentes estimulantes de eritropoyesis en pacientes con IC cr&oacute;nica, ERC y anemia mejoran la funci&oacute;n cardiaca y favorecen la reducci&oacute;n del p&eacute;ptido natriur&eacute;tico tipo B (BNP).<sup>49</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>SCR tipo 3: s&iacute;ndrome renocardiaco agudo</b></font></p>     <p align="justify"><font face="verdana" size="2">El SCR tipo 3 se caracteriza por LRA que genera disfunci&oacute;n cardiaca aguda. Los mecanismos de lesi&oacute;n son m&uacute;ltiples. La sobrecarga de l&iacute;quidos contribuye al desarrollo de edema pulmonar. La hiperkalemia puede producir trastornos del ritmo y de la conducci&oacute;n cardiaca. La uremia afecta directamente la contractilidad mioc&aacute;rdica mediante la acumulaci&oacute;n de factores depresores, especialmente cuando existe pericarditis. La acidemia produce vasoconstricci&oacute;n pulmonar, tiene efecto inotr&oacute;pico negativo e incrementa el riesgo de arritmias.<sup>50,51</sup> Finalmente, la isquemia renal puede inducir inflamaci&oacute;n y apoptosis a nivel cardiaco. Si la isquemia es de origen renovascular, puede generar disfunci&oacute;n diast&oacute;lica asociada a HAS por activaci&oacute;n excesiva del S-RAA.<sup>52,53</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los biomarcadores de lesi&oacute;n cardiaca pueden ser auxiliares del diagn&oacute;stico y el tratamiento. Las troponinas cardiacas se correlacionan con la enfermedad renal. El BNP permite el diagn&oacute;stico de ICD aguda y cr&oacute;nica agudizada y es un predictor independiente de eventos cardiovasculares y de mortalidad global en pacientes con insuficiencia renal. En la IC, a pesar de los altos niveles de BNP s&eacute;rico, su determinaci&oacute;n no parece suficiente para prevenir el SCR.<sup>54,55</sup></font></p>     <p align="justify"><font face="verdana" size="2">La mieloperoxidasa es un marcador de metabolismo alterado, estr&eacute;s oxidativo e inflamaci&oacute;n en los miocitos. El estr&eacute;s oxidativo produce necrosis y apoptosis en los miocitos y se asocia a disfunci&oacute;n endotelial y arritmias. Las citocinas inflamatorias como el TNF-&alpha; y las IL-1 e IL-6, se han propuesto como posibles biomarcadores en esta entidad.<sup>56,57</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>SCR tipo 4: s&iacute;ndrome renocardiaco cr&oacute;nico</b></font></p>     <p align="justify"><font face="verdana" size="2">El SCR tipo 4 se caracteriza por una condici&oacute;n primaria de ERC que contribuye a decremento de la funci&oacute;n cardiaca, hipertrofia ventricular, disfunci&oacute;n diast&oacute;lica y aumento en el riesgo de eventos cardiovasculares.<sup>58</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las troponinas, dimetilarginina asim&eacute;trica, inhibidor del activador del plasmin&oacute;geno 1, homociste&iacute;na, p&eacute;ptidos natriur&eacute;ticos, prote&iacute;na C reactiva, amiloide s&eacute;rico, hemoglobina y alb&uacute;mina modificada por isquemia son los principales biomarcadores propuestos.<sup>59</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>SCR tipo 5: s&iacute;ndrome cardiorrenal secundario</b></font></p>     <p align="justify"><font face="verdana" size="2">El SCR tipo 5 se caracteriza por la presencia simult&aacute;nea de disfunci&oacute;n renal y cardiaca asociada con los trastornos sist&eacute;micos agudos o cr&oacute;nicos. Existen datos limitados acerca de la afecci&oacute;n a otros sistemas org&aacute;nicos; sin embargo, se evidencia en enfermedades sist&eacute;micas como DM, amiloidosis, lupus eritematoso sist&eacute;mico (LES) y sarcoidosis.<sup>60,61</sup> La sepsis es la causa m&aacute;s com&uacute;n y grave que induce LRA y depresi&oacute;n mioc&aacute;rdica.<sup>62,63</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La viabilidad y aplicabilidad cl&iacute;nica de esta clasificaci&oacute;n es dif&iacute;cil de establecer. A pesar de un mayor conocimiento de la fisiopatolog&iacute;a y mejores herramientas diagn&oacute;sticas, los elementos precursores del s&iacute;ndrome son dif&iacute;ciles de identificar; a menudo, las consecuencias org&aacute;nicas y cl&iacute;nicas son detectadas simult&aacute;neamente y es casi imposible determinar qu&eacute; factor fue el precursor (<a href="#a6t2" target="_self">Cuadro II</a>).</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p><a name="a6t2"></a></p>    <p>&nbsp;</p>    <p align="center"><img src="../img/revistas/rmc/v26n1/a6t2.jpg"></p>    <p>&nbsp;</p>    <p><font size="2" face="Verdana"></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>FISIOPATOLOG&Iacute;A</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se presentar&aacute;n por separado los mecanismos patog&eacute;nicos con fines did&aacute;cticos, ya que todos participan de forma simult&aacute;nea y no excluyente.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Mecanismos hemodin&aacute;micos</b></font></p>     <p align="justify"><font face="verdana" size="2">Se pensaba que el SCR comenzaba con la disfunci&oacute;n ventricular izquierda que generaba disminuci&oacute;n del flujo sangu&iacute;neo renal, con la resultante retenci&oacute;n h&iacute;drica y aumento de la sobrecarga del coraz&oacute;n.<sup>58</sup> Pero la disfunci&oacute;n ventricular es un mecanismo cierto pero insuficiente, pues la asociaci&oacute;n lesiva se ha observado incluso en pacientes con fracci&oacute;n de expulsi&oacute;n ventricular conservada.<sup>64,65</sup> Adicionalmente, la elevaci&oacute;n de la presi&oacute;n venosa central (PVC) limita la formaci&oacute;n de orina y el flujo sangu&iacute;neo renal, sobre todo si es causada por compresi&oacute;n venosa extr&iacute;nseca (por ejemplo, la ascitis),<sup>66</sup> pero el mecanismo no opera hasta que la presi&oacute;n intraabdominal es &ge; 20 mmHg,<sup>67,68</sup> proceso similar al que ocurre en el s&iacute;ndrome compartimental abdominal.<sup>69</sup> Algunos estudios revelan que la insuficiencia tricusp&iacute;dea y la congesti&oacute;n venosa son factores que disminuyen la tasa de filtraci&oacute;n glomerular (TFG) en pacientes con IC descompensada y FEVI disminuida.<sup>70,71</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Mecanismos neurohumorales</b></font></p>     <p align="justify"><font face="verdana" size="2">Los siguientes sistemas integran mecanismos involucrados en el proceso; act&uacute;an como procesos compensatorios fisiol&oacute;gicos que, finalmente, contribuyen a mantener el deterioro org&aacute;nico.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Sistema nervioso aut&oacute;nomo:</b> la persistente actividad adren&eacute;rgica altera la regulaci&oacute;n de los receptores &beta;-1 mioc&aacute;rdicos, disminuye el n&uacute;mero de receptores &beta;1 y &beta;2 y afecta sus se&ntilde;ales de traducci&oacute;n.<sup>72,73</sup> Se desconoce si es un mecanismo de da&ntilde;o directo; sin embargo, el aumento de la activaci&oacute;n simp&aacute;tica agrava la funci&oacute;n cardiaca y renal.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Sistema renina-angiotensina-aldosterona: </b>se activa con la disminuci&oacute;n de la perfusi&oacute;n renal. Su efecto principal, la vasoconstricci&oacute;n, resulta en un aumento de la postcarga y disminuci&oacute;n del gasto cardiaco. La angiotensina II participa en la s&iacute;ntesis de citocinas renales, regula la proliferaci&oacute;n celular, favorece la fibrosis y la apoptosis, provocando hipertrofia vascular y disfunci&oacute;n endotelial. Los receptores de mineralocorticoides presentes en los cardiomiocitos y fibroblastos promueven la hipertrofia y la dilataci&oacute;n cardiaca.<sup>74,75</sup> La actividad aumentada de aldosterona promueve la disfunci&oacute;n endotelial.<sup>76</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Arginina vasopresina: </b>causa vasoconstricci&oacute;n a trav&eacute;s de receptores V1 con aumento en la postcarga y promueve retenci&oacute;n de agua mediante el receptor V2, cuya acci&oacute;n antidiur&eacute;tica agrava el componente hemodin&aacute;mico.<sup>77</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Adenosina: </b>la adenosina tiene efectos reguladores en la funci&oacute;n renal a trav&eacute;s de receptores A1. El efecto global es la disminuci&oacute;n de la TFG, el aumento en la reabsorci&oacute;n de sodio en el t&uacute;bulo proximal y la resistencia a los diur&eacute;ticos.<sup>78,79</sup> Los niveles de adenosina se elevan tanto en falla cardiaca como en la hipoxia.<sup>80,81</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Mediadores inflamatorios y da&ntilde;o celular oxidativo</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La mala adaptaci&oacute;n hemodin&aacute;mica causa activaci&oacute;n del S-RAA. La angiotensina II produce la activaci&oacute;n de la oxidasa del dinucle&oacute;tido de nicotinamida y adenina (NADH) y de la oxidasa del dinucle&oacute;tido fosfatado de nicotinamida y adenina (NADPH) en las membranas del m&uacute;sculo liso vascular, los miocitos cardiacos y el epitelio tubular renal, produciendo radicales super&oacute;xido.<sup>82,83</sup> Estos mecanismos contribuyen directamente a la lesi&oacute;n renal y regulan positivamente las citocinas, dando lugar a crecimiento celular anormal, inflamaci&oacute;n y fibrosis. Existe asociaci&oacute;n entre la gravedad de la enfermedad con el aumento de especies reactivas de ox&iacute;geno y NADPH.<sup>84</sup></font></p>     <p align="justify"><font face="verdana" size="2">La inflamaci&oacute;n tambi&eacute;n contribuye a la anemia, por aumento de la hepcidina, que disminuye la disponibilidad de hierro e inhibe su liberaci&oacute;n por los hepatocitos y macr&oacute;fagos.<sup>85</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Disfunci&oacute;n endotelial</b></font></p>     <p align="justify"><font face="verdana" size="2">Las enfermedades cardiaca y renal se han asociado de manera independiente a disfunci&oacute;n endotelial,<sup>86</sup> generando actividad vasomotora anormal<sup>87</sup> con vasoconstricci&oacute;n e hipoxia. Las c&eacute;lulas endoteliales liberan &oacute;xido n&iacute;trico en respuesta al roce del flujo laminar.<sup>88</sup> La disminuci&oacute;n de la tensi&oacute;n secundaria a la falla de bomba es un mecanismo potencial para disfunci&oacute;n endotelial,<sup>89</sup> al igual que la disminuci&oacute;n de la viscosidad sangu&iacute;nea por anemia.<sup>90</sup> El aumento del estr&eacute;s oxidativo genera da&ntilde;o endotelial.<sup>91</sup> La magnitud de la apoptosis se incrementa por el factor de necrosis tumoral (TNF-&alpha;) y la disminuci&oacute;n del &oacute;xido n&iacute;trico.<sup>92,93</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Aterosclerosis</b></font></p>     <p align="justify"><font face="verdana" size="2">La ERC es una causa identificada de aterosclerosis acelerada y se asocia con la disminuci&oacute;n de la TFG;<sup>86,87</sup> asimismo, la enfermedad ateroscler&oacute;tica puede inducir disfunci&oacute;n renal por isquemia.<sup>88</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Proteinuria</b></font></p>     <p align="justify"><font face="verdana" size="2">La albuminuria no s&oacute;lo refleja da&ntilde;o glomerular, es un indicador sensible de disfunci&oacute;n endotelial generalizada y vasculopat&iacute;a capilar. Existe una asociaci&oacute;n exponencial entre albuminuria y riesgo cardiovascular por enfermedad coronaria; adem&aacute;s, si la proteinuria es masiva puede causar retenci&oacute;n de l&iacute;quidos y agravar el compromiso hemodin&aacute;mico.<sup>94</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Anemia y metabolismo del hierro</b></font></p>     <p align="justify"><font face="verdana" size="2">La ferropenia es usual, incluso con niveles de ferritina normales<sup>95</sup> y est&aacute; fuertemente asociada a peor pron&oacute;stico. Por otra parte, la eritropoyetina puede prevenir la apoptosis y aumentar el n&uacute;mero de miocitos.<sup>96</sup> En la cl&iacute;nica, la anemia puede facilitar o exacerbar la IC.<sup>97,98</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Atrofia muscular y caquexia</b></font></p>     <p align="justify"><font face="verdana" size="2">La caquexia es com&uacute;n en pacientes con ERC y falla cardiaca, siendo un factor de riesgo de morbilidad y mortalidad.<sup>99,100</sup> La p&eacute;rdida de masa muscular y tejido graso puede explicarse por la anorexia de la enfermedad cr&oacute;nica. Las v&iacute;as inflamatorias y neurohumorales participan en el proceso. La angiotensina II puede favorecer la p&eacute;rdida de masa muscular y el incremento en la actividad de la oxidasa de NADPH, adem&aacute;s de tener efecto anorexig&eacute;nico.<sup>101</sup> Los frecuentes defectos de absorci&oacute;n intestinal empeoran el estado nutricional.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Deficiencia de vitamina D</b></font></p>     <p align="justify"><font face="verdana" size="2">La IRC cursa con deficiencia de vitamina D, defecto observado en la insuficiencia cardiaca.<sup>102</sup> La vitamina D forma parte de los procesos reguladores de la presi&oacute;n arterial y de la hormona paratiroidea.<sup>103</sup> Un estudio mostr&oacute; el efecto antihipertr&oacute;fico cardiaco por medio del receptor de la vitamina D y su se&ntilde;alizaci&oacute;n a trav&eacute;s de la v&iacute;a de la calcineurina.<sup>104</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Factor de crecimiento fibrobl&aacute;stico 23 (FCF 23)</b></font></p>     <p align="justify"><font face="verdana" size="2">El FCF 23 es una hormona liberada por osteocitos y osteoblastos en presencia de sobrecarga de fosfato (por ejemplo, en ERC), promoviendo su eliminaci&oacute;n renal.<sup>105</sup> Permanece con una regulaci&oacute;n positiva y exponencial conforme declina la TFG.<sup>106,107</sup> Su incremento se asocia a hipertrofia del ventr&iacute;culo izquierdo.<sup>108</sup> Asimismo disminuye la expresi&oacute;n de vitamina D contribuyendo a la calcificaci&oacute;n arterial.<sup>109</sup> Estos cambios forman parte de las alteraciones en la homeostasis mineral y &oacute;sea.<sup>110</sup> Algunos estudios muestran que la elevaci&oacute;n de FCF 23 es predictor independiente de la mortalidad en pacientes con IC sist&oacute;lica.<sup>111</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>FACTORES PRON&Oacute;STICOS</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Enfermedad cardiovascular con insuficiencia renal</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El riesgo de mortalidad en este grupo de pacientes se puede estimar mediante tres variables, dos de las cuales son reflejo de la funci&oacute;n renal (creatinina &gt; 2.75 mg/dL y nitr&oacute;geno ureico &gt; 43 mg/dL) y la tercera, un par&aacute;metro hemodin&aacute;mico, la presi&oacute;n arterial sist&oacute;lica (PAS) &le; 115 mmHg.<sup>7</sup> La presencia de las tres variables eleva la mortalidad en casi 22%. El riesgo comienza a ser evidente con niveles de creatinina s&eacute;rica mayor a 1.3 mg/dL y/o TFG &lt; 60 mL/min.<sup>29</sup> Smith y colaboradores mostraron que hasta 63% de pacientes con IC presentaban alg&uacute;n grado de disfunci&oacute;n renal y 29% ten&iacute;an disfunci&oacute;n de moderada a severa (creatinina &ge; 1.5 mg/dL, cistatina C 1.56 o TFG &le; 53 mL/min). La mortalidad a un a&ntilde;o en pacientes con grado leve de ERC fue de 38%, elev&aacute;ndose hasta 51% en enfermedad moderada o severa. Se observ&oacute; aumento de 15% en la mortalidad por cada 0.5 mg/dL de elevaci&oacute;n de creatinina s&eacute;rica y 7% por cada 10 mL/min que disminu&iacute;a la TFG.<sup>112</sup> Entonces, la disfunci&oacute;n renal es un factor de riesgo independiente de morbilidad y mortalidad cardiovascular.<sup>30,113</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Enfermedad renal con enfermedad cardiovascular</b></font></p>     <p align="justify"><font face="verdana" size="2">Los pacientes con ERC muestran riesgo elevado de complicaciones cardiovasculares, que en conjunto son la principal causa de muerte en pacientes sometidos a di&aacute;lisis (45%). El riesgo de muerte por enfermedad cerebrovascular (ECV) es hasta 10 o 20 veces mayor que en pacientes con funci&oacute;n renal normal.<sup>31,114</sup> Los pacientes con ERC en estadios 2, 3 y 4 presentan mayor probabilidad de morir por causas cardiovasculares: 19.5, 24.3 y 45.7%, respectivamente, y de progresar hacia la terapia de sustituci&oacute;n renal (TSR) en 1.1, 1.3 y 19.9%, respectivamente.<sup>115</sup> Seg&uacute;n el estudio MERENA, de Espa&ntilde;a, los pacientes con TSR presentan alta incidencia de compromiso cardiovascular, con 75% de hipertrofia ventricular izquierda (HVI), 40% de enfermedad coronaria y hasta 50% de riesgo de infarto agudo del miocardio en los dos primeros a&ntilde;os del inicio de la intervenci&oacute;n sustitutiva.<sup>116</sup> Los pacientes con ERC que no han sido sometidos a di&aacute;lisis frecuentemente presentan HAS (37%), dislipidemia (13%), DM (16%) y anemia (8.6%), factores de riesgo cardiovascular y marcadores de mal pron&oacute;stico.<sup>117</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>DIAGN&Oacute;STICO</b></font></p>     <p align="justify"><font face="verdana" size="2">Los criterios propuestos para el diagn&oacute;stico son: insuficiencia cardiaca (FEVI &lt; 40%), insuficiencia renal y compromiso hemodin&aacute;mico.<sup>3</sup> La detecci&oacute;n de las etapas tempranas del s&iacute;ndrome resulta dif&iacute;cil, ya que requiere experiencia cl&iacute;nica y alto grado de sospecha. Lo complejo de la entidad obliga a detectarla de manera temprana. Debido a que puede ser oligosintom&aacute;tico de manera inicial, se sugiere an&aacute;lisis espec&iacute;fico en pacientes de alto riesgo (<a href="../img/revistas/rmc/v26n1/a6t3.jpg" target="_blank">Cuadro III</a>).</font></p>     <p align="justify"><font face="verdana" size="2">La velocidad de filtrado glomerular estimada (eVFG) es &uacute;til para monitorear la progresi&oacute;n de ERC. La creatinina s&eacute;rica es un criterio para definir la severidad de da&ntilde;o renal (criterios RIFLE).<sup>117</sup></font></p>     <p align="justify"><font face="verdana" size="2">El uroan&aacute;lisis ayuda a identificar la naturaleza del da&ntilde;o renal. Una marcada proteinuria (&gt; 3.5 g/d&iacute;a) sugiere enfermedad glomerular. La microalbuminuria es un indicador temprano de da&ntilde;o renal.<sup>118</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los biomarcadores prometen ser un medio de diagn&oacute;stico temprano en pacientes con LRA.<sup>106,107</sup> La NGAL es producida en c&eacute;lulas nucleadas y se asocia con da&ntilde;o renal isqu&eacute;mico. Los niveles de cistatina C pueden ser marcadores tempranos de IRA;<sup>119</sup> sin embargo, la evidencia a&uacute;n es insuficiente para considerarla una herramienta definitiva.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los electrolitos s&eacute;ricos son cr&iacute;ticos. Los niveles de potasio elevado y de calcio bajo predisponen al desarrollo de arritmias. El electrocardiograma ofrece informaci&oacute;n para monitorear arritmias y cambios por isquemia. Los niveles de troponinas cardiacas pueden elevarse en pacientes con ERC, incluso sin datos de afecci&oacute;n cardiaca.<sup>120</sup></font></p>     <p align="justify"><font face="verdana" size="2">La monitorizaci&oacute;n hemodin&aacute;mica estrecha en pacientes susceptibles puede auxiliar al diagn&oacute;stico oportuno. Tanto el BNP, como el prop&eacute;ptido natriur&eacute;tico cerebral N-terminal (NT-pro BNP) son utilizados como biomarcadores para IC descompensada y sobrecarga de volumen, aunque en pacientes con ERC son poco precisos.<sup>121</sup> En la radiograf&iacute;a de t&oacute;rax se puede evidenciar la falla cardiaca con la presencia de cardiomegalia, l&iacute;neas B de Kerley y fluido alveolar.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>TRATAMIENTO</b></font></p>     <p align="justify"><font face="verdana" size="2">Hasta el momento no existe un tratamiento &uacute;nico para el SCR. El abordaje debe ser de forma multidireccional. No se ha demostrado que los tratamientos convencionales para insuficiencia cardiaca y renal ofrezcan beneficio adicional. El manejo de diur&eacute;ticos e IECA, cuando la TFG es menor a 30 mL/min, debe llevarse a cabo con precauci&oacute;n. Las estrategias est&aacute;n encaminadas a proteger y, si es posible, lograr mejor&iacute;a funcional (<a href="#a6t4" target="_self">Cuadro IV</a>).</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p><a name="a6t4"></a></p>    <p>&nbsp;</p>    <p align="center"><img src="../img/revistas/rmc/v26n1/a6t4.jpg"></p>    ]]></body>
<body><![CDATA[<p>&nbsp;</p>    <p><font size="2" face="Verdana"></font></p>     <p align="justify"><font face="verdana" size="2"><b>Diur&eacute;ticos</b></font></p>     <p align="justify"><font face="verdana" size="2">La congesti&oacute;n cardiaca (CC) causa s&iacute;ntomas de IC y contribuye a la remodelaci&oacute;n cardiaca, por lo que la disminuci&oacute;n de la CC es el principal objetivo de los diur&eacute;ticos,<sup>122,123</sup> tratamiento de elecci&oacute;n en pacientes con IC en SCR; sin embargo, la excesiva diuresis puede empeorar la funci&oacute;n renal y activar sistemas neurohumorales. La tasa de eliminaci&oacute;n por diur&eacute;ticos (TED) no debe exceder la tasa de movilizaci&oacute;n de fluido intersticial (MFI). En pacientes con enfermedad renal terminal, la MFI se ha estimado en 12-15 mL/min.<sup>124</sup></font></p>     <p align="justify"><font face="verdana" size="2">Una alternativa es modificar la administraci&oacute;n de diur&eacute;ticos de asa a infusi&oacute;n continua en pacientes sin respuesta cl&iacute;nica. Otra alternativa para reducir la resistencia a diur&eacute;ticos de asa es a&ntilde;adir agentes que act&uacute;an en la nefrona distal, como tiazidas o metolazona; alternativamente se pueden administrar altas dosis de antagonistas de receptor de la aldosterona, esquema m&aacute;s seguro en pacientes con IC cr&oacute;nica, aunque en pacientes con disfunci&oacute;n renal grave existe riesgo de hipercalemia.<sup>125</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Ultrafiltraci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Las congestiones pulmonar y sist&eacute;mica son la principal causa de hospitalizaci&oacute;n en pacientes con falla cardiaca<sup>6</sup> y contribuyen a resultados adversos.<sup>126</sup> Los registros europeos muestran que el manejo hospitalario de la congesti&oacute;n a menudo es poco satisfactorio.<sup>127,128</sup> La resistencia al tratamiento diur&eacute;tico incrementa la morbilidad y la mortalidad.<sup>130</sup> El estudio ESCAPE mostr&oacute; que los incrementos de la presi&oacute;n capilar pulmonar y sus cambios con la bipedestaci&oacute;n, presentes con la sobrehidrataci&oacute;n, son fuertes predictores de mortalidad tras el alta de los pacientes que tuvieron descompensaci&oacute;n de IC.<sup>129</sup></font></p>     <p align="justify"><font face="verdana" size="2">Hasta 60% de los enfermos con SCR agudo que reciben diur&eacute;ticos, presenta empeoramiento funcional renal.<sup>142</sup> Esta complicaci&oacute;n presagia pobres resultados pron&oacute;sticos.<sup>130,131</sup> El empleo de dosis elevadas de diur&eacute;ticos de asa es asociado con enfermedad renal m&aacute;s grave,<sup>132</sup> y en algunos estudios observacionales este hecho se ha asociado con peores resultados cardiovasculares.<sup>130</sup></font></p>     <p align="justify"><font face="verdana" size="2">La extracci&oacute;n mec&aacute;nica de fluido (ultrafiltraci&oacute;n &#91;UF&#93;) se ha propuesto como una alternativa razonable con pacientes en quienes fracasa el tratamiento farmacol&oacute;gico.<sup>133</sup> Guazzi y colaboradores informaron que, al reducir en 20% el volumen plasm&aacute;tico, parad&oacute;jicamente se presenta una reducci&oacute;n de la actividad de renina plasm&aacute;tica y de los niveles s&eacute;ricos de norepinefrina y aldosterona.<sup>134</sup> Este y otros estudios observaron aumentos en la diuresis y la excreci&oacute;n de sodio posterior al tratamiento.<sup>135,136</sup> Una gran ventaja es que estos beneficios parecen ser duraderos. De manera adicional, Agostini y colaboradores encontraron mejor&iacute;a funcional en los par&aacute;metros respiratorios.<sup>137</sup> Estudios posteriores muestran disminuci&oacute;n en la tasa de reingresos hospitalarios en pacientes manejados con UF, respecto a los tratados con diur&eacute;ticos.<sup>137</sup> Muchos efectos ben&eacute;ficos parecen estar relacionados con un marcado descenso de la presi&oacute;n venosa sist&eacute;mica<sup>138,139</sup></font></p>     <p align="justify"><font face="verdana" size="2">Muchas han sido las modalidades empleadas en pacientes con SCR agudo y cr&oacute;nico y los resultados encontrados son variables pero, en general, con tendencia favorable hacia esta modalidad de manejo. El mejor perfil cl&iacute;nico parece presentarse en las terapias que incluyen hemofiltraci&oacute;n y hemodiafiltraci&oacute;n (<a href="../img/revistas/rmc/v26n1/a6t5.jpg" target="_blank">Cuadro V</a>).<sup>133</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El estudio ULTRADISC acerca de los efectos de la ultrafiltraci&oacute;n frente al abordaje con diur&eacute;ticos en pacientes con alteraciones hemodin&aacute;micas, aunado a IC descompensada, mostr&oacute; mayor mejor&iacute;a cl&iacute;nica y mayores descensos de la aldosterona y el NT-pro BNP en el grupo de UF.<sup>140</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Vasodilatadores</b></font></p>     <p align="justify"><font face="verdana" size="2">El objetivo terap&eacute;utico principal al emplearlos es disminuir la congesti&oacute;n cardiaca, el volumen intravascular, las presiones de llenado cardiaco y los s&iacute;ntomas. El enfoque consiste en disminuir la resistencia vascular sist&eacute;mica. Para tal efecto, se han usado nitroprusiato de sodio, nitroglicerina y nesiritide. Son de suma importancia cuando hay mala respuesta a los diur&eacute;ticos o necesidad de resolver los s&iacute;ntomas r&aacute;pidamente. La reducci&oacute;n de la postcarga resultante aumenta el gasto cardiaco y el flujo arterial, mejorando la funci&oacute;n renal en ciertos pacientes, como en aquellos con miocardiopat&iacute;a dilatada e insuficiencia mitral.<sup>141,142</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Inotr&oacute;picos</b></font></p>     <p align="justify"><font face="verdana" size="2">El efecto fundamental de cualquier agente inotr&oacute;pico en SCR es mejorar la funci&oacute;n cardiaca.<sup>143</sup> Est&aacute;n indicados en pacientes con inestabilidad hemodin&aacute;mica (&iacute;ndice cardiaco &lt; 2.0 L/min/m<sup>2</sup> e hipotensi&oacute;n), presi&oacute;n auricular derecha &gt; 10 mmHg y empeoramiento de los s&iacute;ntomas a pesar de recibir la terapia convencional. Tambi&eacute;n pueden ser ben&eacute;ficos en sobrecarga de l&iacute;quidos y resistencia a diur&eacute;ticos con insuficiencia renal y/o disfunci&oacute;n hep&aacute;tica.<sup>144</sup></font></p>     <p align="justify"><font face="verdana" size="2">La disfunci&oacute;n renal severa puede ser consecuencia del bajo gasto cardiaco y, por tanto, la necesidad de utilizar inotr&oacute;picos es crucial. Parad&oacute;jicamente, su empleo se asocia con mayor mortalidad.<sup>145</sup> Tambi&eacute;n pueden ser utilizados como un puente hacia el tratamiento definitivo (por ejemplo, trasplante renal) o, m&aacute;s a menudo, para disminuir la sobrecarga de volumen y la regurgitaci&oacute;n mitral. En la pr&aacute;ctica cl&iacute;nica se usan dobutamina, levosimend&aacute;n y milrinona.<sup>146,147</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>IECA's y ARA's</b></font></p>     <p align="justify"><font face="verdana" size="2">Su papel en insuficiencia cardiaca avanzada con SCR no est&aacute; bien definido;<sup>148</sup> no se ha establecido de forma precisa el momento indicado para iniciarlos. En pacientes con insuficiencia cardiaca cr&oacute;nica tratados con inhibidores de la ECA, la creatinina s&eacute;rica fue estable durante un periodo de seis meses.<sup>149</sup> La vasodilataci&oacute;n de la arteriola renal eferente puede exacerbar la disfunci&oacute;n renal inducida por diur&eacute;ticos.<sup>144</sup> A pesar de esto, los pacientes con IC pueden beneficiarse con esta opci&oacute;n.<sup>148</sup> Aun as&iacute;, la tasa de prescripci&oacute;n de estos medicamentos est&aacute; inversamente relacionada con la funci&oacute;n renal en pacientes con IC.<sup>149,150</sup> Los factores de riesgo para el empeoramiento de la funci&oacute;n renal son su empleo en hipotensi&oacute;n, presiones de llenado ventriculares bajas, dosis altas de diur&eacute;ticos de asa e hiponatremia.</font></p>     <p align="justify"><font face="verdana" size="2">En teor&iacute;a, deben iniciarse en pacientes con congesti&oacute;n grave. Se recomienda disminuir la dosis del diur&eacute;tico al iniciarlos en pacientes con disminuci&oacute;n de la funci&oacute;n renal y utilizar dosis m&aacute;s bajas. Es importante evitar descensos abruptos de la presi&oacute;n arterial y mantener una estrecha vigilancia.<sup>151</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>DISCUSI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">El s&iacute;ndrome cardiorrenal se presenta como una compleja interacci&oacute;n. En ocasiones, no se identifica con certeza la lesi&oacute;n inicial. Las anormalidades hemodin&aacute;micas, neurohumorales e inmunol&oacute;gicas descritas en pacientes con falla cardiaca y renal deben ser revisadas de manera individual; por tanto, se sugiere identificar componentes cl&iacute;nicos y bioqu&iacute;micos para su diagn&oacute;stico temprano (<a href="../img/revistas/rmc/v26n1/a6t6.jpg" target="_blank">Cuadro VI</a>).</font></p>     <p align="justify"><font face="verdana" size="2">El analizar y conocer las interacciones no s&oacute;lo debe enfocarse en las condiciones cl&iacute;nicas y tratarse como una patolog&iacute;a &uacute;nica, ya que hasta ahora no se ha establecido el mecanismo promotor del da&ntilde;o.</font></p>     <p align="justify"><font face="verdana" size="2">El objetivo de esta revisi&oacute;n es identificar el grupo de alteraciones como un s&iacute;ndrome, conocer los mecanismos fisiopatol&oacute;gicos, establecer los posibles criterios y medios de diagn&oacute;stico e indicar el tratamiento &oacute;ptimo para evitar las manifestaciones m&aacute;s graves. Se debe establecer un esquema de tratamiento personalizado, multidisciplinario e integral, dentro del cual no solamente se contemplen los f&aacute;rmacos.</font></p>     <p align="justify"><font face="verdana" size="2">Puede influir positivamente, incluir un plan nutricional con alimentos o suplementos que disminuyan la inflamaci&oacute;n, y antioxidantes que mejoren la funci&oacute;n mitocondrial. Dentro de &eacute;stos, parece l&oacute;gico incluir:</font></p>     <p align="justify"><font face="verdana" size="2">1. Suplementaci&oacute;n con arginina, y omega 3. Puede interferir en las v&iacute;as moleculares de estr&eacute;s oxidativo e inflamaci&oacute;n.<sup>152</sup></font></p>     <p align="justify"><font face="verdana" size="2">2. Vitaminas A, C, E, betacaroteno y &aacute;cido f&oacute;lico. Potenciales terap&eacute;uticos para mejorar la funci&oacute;n endotelial, disminuir al riesgo cardiovascular asociado con ateroesclerosis y efectos antiinflamatorios.<sup>153,154</sup></font></p>     <p align="justify"><font face="verdana" size="2">3. Glutamina y lisina, que pueden inhibir la activaci&oacute;n NF-k&beta; y la expresi&oacute;n de citocinas.<sup>155</sup></font></p>     <p align="justify"><font face="verdana" size="2">4. Disminuir el consumo de grasas saturadas. La activaci&oacute;n de macr&oacute;fagos, la inducci&oacute;n de inflamaci&oacute;n y el estr&eacute;s oxidativo se relacionan fuertemente con su ingesti&oacute;n.<sup>156</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">5. Vitamina D.<sup>104</sup></font></p>     <p align="justify"><font face="verdana" size="2">6. Glutati&oacute;n e isoflavonas, como antioxidantes y antiinflamatorios.<sup>157</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">El SCR es com&uacute;n en pacientes con falla cardiaca e incluye una fase de da&ntilde;o renal progresivo y resistencia a los diur&eacute;ticos, especialmente en procesos cr&oacute;nicos. Los mecanismos fisiopatol&oacute;gicos son m&uacute;ltiples. Los s&iacute;ntomas est&aacute;n asociados con la retenci&oacute;n de agua y sodio. El tratamiento tradicional, tanto de la enfermedad renal como cardiaca, se hab&iacute;a enfocado a las v&iacute;as hemodin&aacute;micas; sin embargo, se conocen v&iacute;as neurohumorales, cruciales en su progresi&oacute;n. De manera emergente, se ha establecido que las v&iacute;as inflamatorias, anemia, caquexia y deficiencia de vitamina D perpet&uacute;an el da&ntilde;o. El objetivo es la instauraci&oacute;n de un manejo individualizado y enfocado a los mecanismos fisiopatol&oacute;gicos dominantes y a sus manifestaciones cl&iacute;nicas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Nhibi.nih.gov &#91;homepage on the internet&#93;. Cardio-renal connections in heart failure and cardiovascular disease. National Heart, Lung and Blood Institute. &#91;Updated 2005 February 18; cited 2014 Oct 10&#93; Available from: <a href="http://www.nhlbi.nih.gov/research/reports/2004-cardiorenal-hf-hd" target="_blank">http://www.nhlbi.nih.gov/research/reports/2004-cardiorenal-hf-hd</a>.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7724421&pid=S0188-2198201500010000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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