<?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>0034-9887</journal-id>
<journal-title><![CDATA[Revista médica de Chile]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. méd. Chile]]></abbrev-journal-title>
<issn>0034-9887</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Médica de Santiago]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-98872012000600016</article-id>
<article-id pub-id-type="doi">10.4067/S0034-98872012000600016</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Microalbuminuria y excreción urinaria de albúmina en la práctica clínica]]></article-title>
<article-title xml:lang="en"><![CDATA[Microalbuminuria and urinary albumin excretion in clinical practice]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tagle]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acevedo]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Pontificia Universidad Católica de Chile Facultad de Medicina Escuela de Medicina]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital del Salvador Departamento de Nefrología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Chile  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Pontificia Universidad Católica de Chile Facultad de Medicina Escuela de Medicina]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>140</volume>
<numero>6</numero>
<fpage>797</fpage>
<lpage>805</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.cl/scielo.php?script=sci_arttext&amp;pid=S0034-98872012000600016&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.cl/scielo.php?script=sci_abstract&amp;pid=S0034-98872012000600016&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><self-uri xlink:href="http://www.scielo.cl/scielo.php?script=sci_pdf&amp;pid=S0034-98872012000600016&amp;lng=en&amp;nrm=iso&amp;tlng=en"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Background: Microalbuminuria is a new tool in the management of patients with diabetes mellitus or hypertension. Microalbuminuria is an easily measured biomarker in a urine sample. Urinary albumin to creatinine ratio in first morning urine sample correlates with 24 hours urinary albumin excretion, but it is easier to obtain, and can identify hypertensive or diabetic patients with high risk for cardiovascular events. Therapeutic interventions such as renin angiotensin system blockade have demonstrated their usefulness in reducing urinary albumin excretion in clinical studies. It would be advisable to incorporate urinary albumin to creatinine ratio to the routine clinical monitoring of patients with cardiovascular risk, such as those with hypertension and diabetes mellitus.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Albuminuria]]></kwd>
<kwd lng="en"><![CDATA[Creatinine]]></kwd>
<kwd lng="en"><![CDATA[Diabetes mellitus]]></kwd>
<kwd lng="en"><![CDATA[Hypertension]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="2">Rev Med Chile 2012; 140: 797&#45;805</font></p> 	    <p align="right"><font face="verdana" size="2"><strong>ART&Iacute;CULO DE REVISI&Oacute;N</strong></font></p> 	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="4"><b>Microalbuminuria y excreci&oacute;n urinaria de alb&uacute;mina en la pr&aacute;ctica cl&iacute;nica</b></font></p>      <p align="justify"><font size="3"><strong><font face="verdana">Microalbuminuria and urinary albumin excretion in clinical practice</font></strong><font face="verdana"></font></font></p>      <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><strong>Rodrigo Tagle<sup>1</sup>, Fernando Gonz&aacute;lez<sup>2</sup>, M&oacute;nica Acevedo<sup>3</sup></strong></font></p>     <p align="justify"><font face="verdana" size="2"><sup>1</sup>Departamento de Nefrolog&iacute;a, Escuela de Medicina, Facultad de Medicina, Pontificia Universidad Cat&oacute;lica de Chile, Chile.    <br> </font><font face="verdana" size="2"><sup>2</sup>Departamento de Nefrolog&iacute;a, Hospital del Salvador, Universidad de Chile, Chile.    ]]></body>
<body><![CDATA[<br> </font><font face="verdana" size="2"><sup>3</sup>Divisi&oacute;n de Enfermedades Cardiovasculares, Escuela de Medicina, Facultad de Medicina, Pontificia Universidad Cat&oacute;lica de Chile, Chile. </font></p>     <p align="justify"><font face="verdana" size="2"><a name="top"></a><a href="#back">Correspondencia a:</a></font></p>     <p align="justify"><hr width="100%" size="1">     <p align="justify"><font face="verdana" size="2"><b><i>Background:</i></b> <i>Microalbuminuria is a new tool in the management of patients with diabetes mellitus or hypertension. Microalbuminuria is an easily measured biomarker in a urine sample. Urinary albumin to creatinine ratio in first morning urine sample correlates with 24 hours urinary albumin excretion, but it is easier to obtain, and can identify hypertensive or diabetic patients with high risk for cardiovascular events. Therapeutic interventions such as renin angiotensin system blockade have demonstrated their usefulness in reducing urinary albumin excretion in clinical studies. It would be advisable to incorporate urinary albumin to creatinine ratio to the routine clinical monitoring of patients with cardiovascular risk, such as those with hypertension and diabetes mellitus.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key words:</i></b> <i>Albuminuria; Creatinine; Diabetes mellitus; Hypertension.</i></font></p>     <p align="justify"><hr width="100%" size="1">     <p align="justify"><font face="verdana" size="2">El aumento de la prevalencia de las enfermedades cardiovasculares (ECV) y renales cr&oacute;nicas (ERC) trae, como consecuencia, la necesidad de buscar marcadores tempranos que sean capaces de identificar sujetos de alto riesgo de sufrir complicaciones cardiovasculares (CV) y/o renales.</font></p> 	    <p align="justify"><font face="verdana" size="2">Uno de estos marcadores es la excreci&oacute;n urinaria de alb&uacute;mina (EUA) en cantidades anormales, tambi&eacute;n llamada microalbuminuria (MA). La MA ha ido ganando terreno en el &aacute;mbito del reconocimiento anticipado de individuos en riesgo como pacientes con diabetes mellitus tipo 2 (DM2) o con hipertensi&oacute;n (HTA).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los objetivos de este art&iacute;culo son revisar: a) en qu&eacute; consiste y c&oacute;mo se produce la MA; b) c&oacute;mo se debe medir; c) las bases cient&iacute;ficas de su uso cl&iacute;nico y d) los estudios cl&iacute;nicos aleatorios de prevenci&oacute;n o reducci&oacute;n de la MA en pacientes con </font><font face="verdana" size="2">DM2 o con HTA.</font></p>  	    <p align="justify"><font face="verdana" size="3"><b>Definici&oacute;n de MA</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La EUA en una poblaci&oacute;n sana corresponde entre 1,5 a 20 &#956;g/min, estando el percentil 90 en </font><font face="verdana" size="2">alrededor de 30 mg/24 hrs<sup>1</sup>. El <i>"dipstick"</i> rutinario del examen de orina puede detectar concentraciones de alb&uacute;mina en niveles superiores a 30 mg/dL, que corresponde a una EUA de 300 mg/24 hrs. Todo lo que se sit&uacute;e por sobre este nivel de excreci&oacute;n se denomina proteinuria. En cambio, MA es definida como el rango intermedio entre lo normal y proteinuria, as&iacute; MA corresponde a una EUA entre 30 a 300 mg/24 hrs<sup>2,3</sup> (<a href="#t1">Tabla.1</a>).</font></p> 	    <p align="center"><font face="verdana" size="2"><strong><a name="t1"></a> Tabla 1. </strong>Definici&oacute;n de microalbuminuria</font></p>     <p align="center"><img src="/fbpe/img/rmc/v140n6/art16-tabla1.jpg" width="382" height="179"></p> 	    
<p align="justify"><font face="verdana" size="3"><b>Patogenia de la MA</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La barrera de filtraci&oacute;n glomerular, compuesta por c&eacute;lulas endoteliales, membrana basal y c&eacute;lulas podocitarias, impide que cantidades mayores a 2.000 mg de alb&uacute;mina, pasen diariamente al espacio de Bowman. La mayor parte de ella (99%) es reabsorbida y degradada en los t&uacute;bulos proximales, excret&aacute;ndose menos de 30 mg/d&iacute;a<sup>4</sup> (<a href="#f1">Figura.1</a>).</font></p> 	    <p align="center"><strong><font face="verdana" size="2"><a name="f1"></a></font></strong></p>     <p align="center"><img src="/fbpe/img/rmc/v140n6/art16-fig1.jpg" width="383" height="263"></p> 	    
<p align="center"><strong><font face="verdana" size="2"> Figura 1. </font></strong><font face="verdana" size="2">Excreci&oacute;n urinaria de alb&uacute;mina.</font></p>     <p align="justify"><font face="verdana" size="2">Una peque&ntilde;a cantidad de fragmentos de alb&uacute;mina puede aparecer en la orina provenientes de la degradaci&oacute;n tubular, pero &eacute;stos no son detectados con los m&eacute;todos utilizados en cl&iacute;nica<sup>5</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se han planteado mecanismos relacionados a trastornos hemodin&aacute;micos y celulares, no excluyentes entre s&iacute;, que tratan de explicar el por qu&eacute; en algunas patolog&iacute;as aumenta la EUA<sup>6</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Trastornos hemodin&aacute;micos</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">En condiciones normales la presi&oacute;n intraglomerular depende del tono de las arteriolas aferente (AA) y eferente (AE). En entidades con desarrollo de hipertensi&oacute;n intraglomerular, se producir&iacute;a mayor filtraci&oacute;n de alb&uacute;mina y luego mayor EUA<sup>7</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En los diab&eacute;ticos, en que se encuentra activado el sistema renina angiotensina (SRA), se produce una vasoconstricci&oacute;n preferentemente de la AE, y como consecuencia, hipertensi&oacute;n intraglomerular<sup>8</sup>. Fen&oacute;meno que se exacerba con la vasodilataci&oacute;n de la AA que ocurre en descompensaciones metab&oacute;licas.</font></p>  	    <p align="justify"><font face="verdana" size="2">En hipertensos, en la medida que se desarrolla arter&iacute;oloesclerosis en las AA, se interfiere con la regulaci&oacute;n de la presi&oacute;n intraglomerular y, por ende, mayor EUA<sup>9</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">As&iacute; entonces, cualquier enfermedad en que se altere el equilibrio de los tonos de las AA y AE, predispondr&aacute; a la aparici&oacute;n de albuminuria<sup>10,11</sup> (<a href="#f2">Figura.2</a>).</font></p> 	    <p align="center"><font face="verdana" size="2"><strong><a name="f2"></a></strong></font>    <br>     <img src="/fbpe/img/rmc/v140n6/art16-fig2.jpg" width="380" height="245"></p> 	    
<p align="center"><font face="verdana" size="2"><strong> Figura 2. </strong>Factores de hipertensi&oacute;n intraglomerular.</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Trastornos celulares</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">Diversos estudios han demostrado que sustancias derivadas del endotelio son capaces de da&ntilde;ar la c&eacute;lula podocitaria, c&eacute;lula filtro clave, que normalmente impide el paso de alb&uacute;mina<sup>12,13</sup>. Ese da&ntilde;o originar&iacute;a un ensanchamiento de los poros del podocito con la subsiguiente p&eacute;rdida de alb&uacute;mina. En este contexto, se ha demostrado que quienes tienen una disfunci&oacute;n endotelial presentan MA<sup>14,15</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Hasta ahora no se conoce claramente el correlato morfol&oacute;gico del estado de MA en DM2 o  HTA.</font></p>  	    <p align="justify"><font face="verdana" size="3"><strong>Medici&oacute;n de MA</strong></font></p>  	    <p align="justify"><font face="verdana" size="2">Inicialmente, la EUA se med&iacute;a en orina de 24 h o en una muestra matinal expresada como mg/ml. Estas mediciones presentan m&uacute;ltiples inconvenientes desde la recolecci&oacute;n de toda la orina de un d&iacute;a hasta el efecto de la diluci&oacute;n o concentraci&oacute;n urinaria. Por ello, se </font><font face="verdana" size="2">ha propuesto que la determinaci&oacute;n se realice en una muestra de orina matinal, efectuando en ella la medici&oacute;n de alb&uacute;mina y creatinina, y que los resultados se expresen como el cuociente albuminuria/creatininuria, en mg/g<sup>16</sup>. Este cuociente tiene una excelente correlaci&oacute;n con la medici&oacute;n tradicional en orina de 24 h<sup>2,3,17</sup>. En caso de haberse expresado en mg/mmol, puede derivarse a mg/g al multiplicarse por 8,84<sup>18</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Por otro lado, en la actualidad las cintas reactivas, dise&ntilde;adas especialmente para su medici&oacute;n, permiten medir la EUA con mucha confiabilidad y sensibilidad, comparado con t&eacute;cnicas m&aacute;s sofisticadas como la nefelometr&iacute;a<sup>19</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las condiciones que pueden incrementar la EUA incluyen: infecci&oacute;n del tracto urinario, insuficiencia cardiaca congestiva (ICC), embarazo, ejercicio extenuante, fiebre, posici&oacute;n de pie prolongada, consumo excesivo de alcohol, sobrecarga salina o proteica, deficiente control de la glicemia y contaminaci&oacute;n con flujo cervical<sup>20</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La alb&uacute;mina en la orina es estable a temperaturas normales y los procesos de almacenamiento o tiempo de &eacute;ste (menos de 7 d&iacute;as) no incrementan los errores de las t&eacute;cnicas actuales<sup>1,21</sup>. No obstante lo anterior, la MA presenta una variabilidad intra&#45;individual de un d&iacute;a a otro de hasta casi 40%, por lo que el diagn&oacute;stico de MA debe confirmarse en una segunda determinaci&oacute;n, de preferencia en ausencia de las condiciones que incrementan la EUA.</font></p>  	    <p align="justify"><font face="verdana" size="3"><b>MA como marcador de riesgo CV y renal</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>Diabetes Mellitus tipo 2</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">En 1984, Mogensen y col, describieron un significativo aumento en la mortalidad cardiovascular en pacientes con DM2 que presentaban MA. En ese estudio, la mayor tasa de muertes de causa CV fue en aquellos diab&eacute;ticos con EUA m&aacute;s elevada, aun antes de desarrollar ERC<sup>22</sup>. Posteriormente, varios estudios transversales, retrospectivos y prospectivos en pacientes con DM2 han corroborado un incremento tanto en la incidencia de ECV como de mortalidad CV en aquellos pacientes con MA, independiente de la presencia de otros factores de riesgo cardiovasculares (FRCV), y que 60% de las muertes en DM2 con MA ocurre por causas CV, tanto cardiacas como cerebrovasculares (AVE)<sup>23&#45;25</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">El estudio <i>HOPE (Heart Outcomes Prevention Evaluation)</i> corrobor&oacute; las diferencias de riesgo entre diab&eacute;ticos con o sin MA: quienes ten&iacute;an </font><font face="verdana" size="2">MA presentaron un riesgo relativo CV mayor comparado con normoalbumin&uacute;ricos y posee un valor predictivo similar a los FRCV tradicionales (<a href="#f3">Figura.3</a>). M&aacute;s a&uacute;n, para un objetivo secundario como ICC, el riesgo relativo se increment&oacute; casi cuatro veces<sup>11</sup>.</font></p> 	    ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><strong><a name="f3"></a></strong></font>    <br>     <img src="/fbpe/img/rmc/v140n6/art16-fig3.jpg" width="382" height="234"></p> 	    
<p align="center"><font face="verdana" size="2"><strong> Figura 3. </strong>Eventos en el estudio Hope seg&uacute;n MA.</font></p>     <p align="justify"><font face="verdana" size="2">En esta misma l&iacute;nea, Dinneen y col, previamente hab&iacute;an observado hallazgos similares en un meta&#45;an&aacute;lisis de 11 estudios longitudinales que inclu&iacute;an 2.138 pacientes con MA, con un seguimiento promedio de 6,4 a&ntilde;os. El riesgo relativo para morbi&#45;mortalidad cardiovascular fue 2,0 (IC 95% 1,4&#45;2,7), y para muerte fue 2,4 (IC 95% 1,8&#45;3,1)<sup>26</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Al analizar la MA desde el punto de vista renal, los aspectos a considerar son: proteinuria, deterioro de la velocidad de filtraci&oacute;n glomerular (VFG) e insuficiencia renal cr&oacute;nica terminal (IRCt). En la mayor&iacute;a de los pacientes con DM2, la nefropat&iacute;a comienza con MA, la cual aumenta progresivamente hasta proteinuria y luego comienza a decaer en paralelo a la VFG<sup>27</sup>. En todo este tiempo, la probabilidad de sufrir un evento CV es mayor en estos enfermos que en diab&eacute;ticos sin MA o proteinuria<sup>28</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Sin embargo, existe una proporci&oacute;n de diab&eacute;ticos tipo 2 que llegan a la IRCt sin desarrollar previamente MA<sup>29&#45;31</sup>. As&iacute; en una cohorte de 502 diab&eacute;ticos con creatinina plasm&aacute;tica &gt; 1,6 mg/dL o en terapia de reemplazo renal (TRR) y registros previos de EUA, s&oacute;lo 2 de ellos no hab&iacute;an presentado MA<sup>32</sup>. En cambio, Ito y col encontraron en 1.197 diab&eacute;ticos 19% normoalbumin&uacute;ricos con VFG &lt; 60 ml/min<sup>32</sup>, y Tsalamandris y col, en 22 diab&eacute;ticos seguidos por 8 a 14 a&ntilde;os, observ&oacute; que 6 de ellos (27%) presentaron deterioro de la VFG sin desarrollar MA<sup>33</sup>. En consecuencia, no todos los pacientes con DM2 e IRCt han presentado previamente MA, pero s&iacute; una proporci&oacute;n significativa.</font></p>  	    <p align="justify"><font face="verdana" size="2">En estudios de pacientes con DM2 y MA la tasa de deterioro de la VFG var&iacute;a entre 0 y 3,5 ml/min/a&ntilde;o, y esta tasa tiende a cambiar seg&uacute;n la evoluci&oacute;n de la EUA, ya sea a normoalbuminuria, MA persistente o proteinuria<sup>34,35</sup>. En 151 pacientes con DM2 y MA del estudio Steno&#45;2 seguidos por 7,8 a&ntilde;os, la tasa de deterioro de la VFG fue diferente seg&uacute;n el cambio en la magnitud de la EUA, ya sea reversi&oacute;n a normoalbuminuria (31%) de 2,3 ml/min/a&ntilde;o, MA persistente (38%) de 3,7 ml/min/a&ntilde;o o proteinuria (31%) de 5,4 ml/min/a&ntilde;o (P &lt; 0,001)<sup>34</sup>. En 214 pacientes japoneses con DM2 y MA seguidos por 2 a&ntilde;os, la tasa de deterioro de la VFG fue tam</font><font face="verdana" size="2">bi&eacute;n diferente seg&uacute;n la reversi&oacute;n a normoalbuminuria o MA persistente, 1,8 vs 3,1 ml/min/a&ntilde;o (P &lt; 0,038)<sup>36</sup>. Sin embargo, en estudios a 4 a&ntilde;os en los indios Pima s&oacute;lo se observa un cambio en la tasa de deterioro de la VFG cuando progresan de MA a proteinuria (1,0 vs 10,1 ml/min/a&ntilde;o), pero no hay diferencia entre normoalbuminuria y MA<sup>37</sup>. As&iacute; entonces, la tasa de deterioro de la VFG tiende a ser mayor a mayor EUA, y la disminuci&oacute;n de la EUA desde un estado de MA tiende a traducirse en un menor deterioro de la VFG.</font></p>  	    <p align="justify"><font face="verdana" size="2">El riesgo de desarrollar proteinuria e IRCt en DM2 con MA est&aacute; claramente establecido. As&iacute; en la revisi&oacute;n sistem&aacute;tica de Newman y col, la presencia de MA le confiere un riesgo relativo de 7,5 (IC 95% 5,2&#45;10,9) y 3,6 (IC 95% 1,6&#45;8,4) respectivamente, comparados con normoalbumin&uacute;ricos<sup>38</sup>. Este riesgo es 5 veces mayor si la VFG se encuentra entre 30 a 59 ml/min<sup>39</sup>. Eso s&iacute; en DM2, la MA como predictor de IRCt es claramente inferior a la proteinuria<sup>30</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">As&iacute;, la MA en DM2 es un predictor de: deterioro de la VFG, proteinuria e IRCt; y puede considerarse un marcador de riesgo renal<sup>32,40</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Existen diversos an&aacute;lisis de costo&#45;efectividad de MA en DM2, que confirman su utilidad predictiva, tanto para eventos CV como para eventos renales<sup>38,41&#45;45</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Hipertensi&oacute;n arterial</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">En HTA se observa algo similar a lo descrito en DM2, aunque con una relaci&oacute;n menos pronunciada. Los estudios europeos Hoorn<sup>46</sup> y dan&eacute;s<sup>47</sup> mostraron que hipertensos con MA seguidos por 5 y 10 a&ntilde;os, elevan su riesgo CV 2,8 y 3,5 veces, respectivamente. El estudio dan&eacute;s demostr&oacute;, por primera vez, que el hecho de ser hipertenso y tener MA, definida como EUA &gt; 5,7 mg/g, confiere un riesgo mayor de presentar un evento coronario, comparado con aquellos que s&oacute;lo son hipertensos, con cualquier valor </font><font face="verdana" size="2">de PAS<sup>47</sup> (<a href="#f4">Figura.4</a>).</font></p> 	    <p align="center"><font face="verdana" size="2"><strong><a name="f4"></a></strong></font>    <br>     <img src="/fbpe/img/rmc/v140n6/art16-fig4.jpg" width="383" height="234"></p> 	    
<p align="center"><font face="verdana" size="2"><strong> Figura 4. </strong>Riesgo relativo de Cardiopatia Coronaria seg&uacute;n nivel de EUA.</font></p>     <p align="justify"><font face="verdana" size="2">En el estudio <i>LIFE (Losartan Intervention For Endpoint Reduction),</i> efectuado en hipertensos con hipertrofia ventricular izquierda (HVI) al ECG, esta relaci&oacute;n de MA y mayor riesgo cardiovascular fue nuevamente confirmada: la presencia de MA eleva la mortalidad y morbilidad CV en 1,7 y 1,8 veces, respectivamente<sup>48,49</sup>. Este hallazgo fue independiente del grado de HVI, edad, sexo, DM y tabaquismo<sup>50</sup>. Adem&aacute;s al igual que en el estudio HOPE, la presencia de MA aumenta significativamente el riesgo de desarrollar ICC.</font></p>  	    <p align="justify"><font face="verdana" size="2">Existen escasos estudios sobre MA como marcador de riesgo renal en HTA<sup>51</sup>. Entre &eacute;stos, Bigazzi y col, en un estudio retrospectivo de 141 hipertensos seguidos por hasta 7 a&ntilde;os report&oacute; que el deterioro de la VFG (12,1 vs 7,1 ml/</font><font face="verdana" size="2">min, P &lt; 0,03) y los eventos CV (21,3 </font><font face="verdana" size="2">vs 2,3%, P &lt; 0.0002) fueron mayores en aquellos con MA comparados con normoalbumin&uacute;ricos<sup>52</sup>. En el estudio <i>MAGIC (Microalbuminuria: A Genoa Investigation on Complications)</i> con 917 hipertensos seguidos por 11,8 a&ntilde;os, la MA se relacion&oacute; significativamente con deterioro de la VFG (RR 12,7; IC 3,6&#45;44,9; P &lt; 0,0001) y con eventos CV </font><font face="verdana" size="2">(RR 2,11; IC 1,08 &#45;4,13; P &lt; 0,028)<sup>53</sup>. Finalmente, en el estudio <i>ONTARGET (Ongoing Telmisartan Alone and in Combination with Ramipril Global Endpoint Trial)</i> con 27.620 pacientes mayores de 55 a&ntilde;os con ECV cl&iacute;nica, 70% con HTA, seguidos por 4,8 a&ntilde;os, la EUA en rangos de MA mostr&oacute; ser un predictor independiente de IRCt<sup>54</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La explicaci&oacute;n de la asociaci&oacute;n entre MA y eventos CV en HTA, pareciera deberse a que la MA se asocia a los FRCV tradicionales y no tradicionales, ya que comparte mecanismos patog&eacute;nicos, tales como: disfunci&oacute;n endotelial, resistencia a la insulina, inflamaci&oacute;n sist&ecirc;mica de bajo grado, disfunci&oacute;n renal y elevaci&oacute;n de la PA<sup>6</sup>. A pesar de la estrecha relaci&oacute;n entre MA y los FRCV, la asociaci&oacute;n entre MA y ECV se mantiene en los an&aacute;lisis multivariados ajustados por los FRCV tradicionales. Asi por ejemplo, el estudio <i>PREVEND (Prevention of Renal and Vascular End&#45;stage Disease)</i> que incluy&oacute; m&aacute;s de 40.000 sujetos, las causas de MA, definida como 20&#45;200 mg/L, fueron principalmente DM2 e HTA<sup>55</sup>. En este estudio: la mortalidad CV y el deterioro de la VFG se correlacionaron con la magnitud de la EUA, y la EUA se correlacion&oacute; con el &iacute;ndice de masa corporal, la excreci&oacute;n urinaria de sodio y la edad<sup>56</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En hipertensos, la MA se asocia a da&ntilde;o de &oacute;rganos blanco, en particular HVI y aterosclerosis carotidea (AC); y a mayor carga de PA<sup>57</sup>. En hipertensos italianos se observ&oacute; que 25% de aquellos con HVI ten&iacute;an MA, pero si a la HVI se le suma AC, el porcentaje con MA se eleva a un 46%<sup>58</sup>. Por otro lado, la asociaci&oacute;n de MA e HTA implica habitualmente ciertas caracter&iacute;sticas como ser <i>"non&#45;dipper"</i> (ausencia de descenso nocturno) y "sal sensible", condiciones, ambas, relacionadas a mayor riesgo CV<sup>59</sup>. En hipertensos tratados, la aparici&oacute;n de MA se relaciona al nivel inicial de EUA, y a los niveles durante el seguimiento de la PAS y glicemia de ayunas<sup>60</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">As&iacute;, la MA en HTA pudiese leg&iacute;timamente considerarse como un marcador integral del riesgo CV<sup>61</sup>, y debido a su relaci&oacute;n a da&ntilde;o de &oacute;rgano blanco, se le recomienda utilizar como marcador de &eacute;ste, en la estratificaci&oacute;n de un hipertenso<sup>62</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="3"><b>Intervenciones terap&eacute;uticas que reducen la MA</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>Diabetes Mellitus tipo 2</i></b></font></p>  	    <p align="justify"><font face="verdana" size="2">En el estudio <i>BENEDICT (Bergamo Nephrologic Diabetes Complications Trial),</i> con 1.200 </font><font face="verdana" size="2">diab&eacute;ticos tipo 2 e hipertensos sin MA seguidos por 3,6 a&ntilde;os, se compar&oacute; el efecto sobre la aparici&oacute;n de MA de 4 esquemas de antihpertensivos: un inhibidor de enzima convertidora de angiotensina (IECA), un bloqueador de canales de calcio no&#45;dihidropirid&iacute;nico (verapamilo), ambos combinados o ninguno de los dos m&aacute;s placebo, todos asociados, seg&uacute;n necesidad, a otros f&aacute;rmacos antihipertensivos para lograr una PA de 120/80 mmHg<sup>63</sup>. Los resultados mostraron que aparec&iacute;a MA en: 5,7% del grupo IECA, 6,0% del grupo combinado, 11,9% del grupo verapamilo y 10,0% del grupo placebo. Se desprende que no basta con controlar la HTA para evitar la aparici&oacute;n de MA, sino que parece primordial el bloquear el SRA. </font></p> 	    <p align="justify"><font face="verdana" size="2">En concordancia con este estudio, est&aacute;n los </font><font face="verdana" size="2">estudios <i>ADVANCE</i> y <i>ROADMAP.</i> En el estudio <i>ADVANCE (Action in Diabetes and Vascular Disease: Preterax and Diamicron MR Controlled Evaluation)</i> se logr&oacute; una reducci&oacute;n del riesgo relativo de desarrollar MA de 21% (IC 95% 14&#45;27, P &lt; 0,0001) en un per&iacute;odo de 4,3 a&ntilde;os, utilizando un IECA como perindopril comparado con una estrategia antihipertensiva sin bloqueo del SRA<sup>64</sup>. El estudio <i>ROADMAP (Randomized Olmesartan And Diabetes Microalbuminuria Prevention Study),</i> por su parte, demostr&oacute; que diab&eacute;ticos tipo 2 que reciben olmesartan, respecto de quienes reciben otra intervenci&oacute;n antihipertensiva que no incluye el bloqueo del SRA, retardan significativamente la aparici&oacute;n de MA a&uacute;n cuando todos logren un excelente control de la PA (<a href="#t2">Tabla.2</a>)<sup>65</sup>.</font></p> 	    <p align="center"><font face="verdana" size="2"><b><a name="t2"></a> Tabla 2. </b>Estudios Randomizados de prevenci&oacute;n de la MA en diab&eacute;ticos tipo 2</font></p>     <p align="center"><img src="/fbpe/img/rmc/v140n6/art16-tabla2.jpg" width="321" height="98"></p> 	    
<p align="justify"><font face="verdana" size="2">En diab&eacute;ticos, la reducci&oacute;n o normalizaci&oacute;n de la MA debiese ser un objetivo terap&eacute;utico. En el estudio <i>IRMA 2 (IRbesartan MicroAlbuminuria Type 2 Diabetes Mellitus),</i> con diab&eacute;ticos hipertensos con MA seguidos por 2 a&ntilde;os, se encontr&oacute; que irbesartan, fue m&aacute;s eficaz que otras terapia s antihipertensivas sin bloqueo del SRA en evitar la aparici&oacute;n de proteinuria, 5,2% vs 15%<sup>35</sup>. M&aacute;s a&uacute;n, el tratamiento con irbesartan 300 mg logr&oacute;</font><font face="verdana" size="2">que un tercio de los sujetos normalizaran su EUA.</font></p>  	    <p align="justify"><font face="verdana" size="2">En el estudio <i>ADVANCE,</i> en 1.441 diab&eacute;ticos con MA, el bloqueo del SRA con un IECA redujo la progresi&oacute;n a proteinuria (6,2% vs 9,0% p = 0,0074), y aument&oacute; la regresi&oacute;n a normoalbuminuria (55,3% vs 49,1% p = 0,0067)<sup>39</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Debe resaltarse que cuando un diab&eacute;tico pasa de un estado de MA a proteinuria, aumenta significativamente el riesgo de muerte y eventos CV, lo que se observ&oacute; en los estudios <i>UKPDS</i> y ADVANCE<sup>27,39</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b><i>Hipertensi&oacute;n arterial</i></b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El estudio <i>LIFE</i> permiti&oacute; observar que un aumento o disminuci&oacute;n de la EUA al a&ntilde;o de seguimiento predice los eventos CV. As&iacute;, la disminuci&oacute;n de la EUA intra&#45;tratamiento, se relaciona a una reducci&oacute;n de los eventos CV, tanto en hipertensos con o sin DM2 (<a href="#t3">Tabla.3</a>)<sup>66</sup>.</font></p> 	    <p align="center"><font face="verdana" size="2"><b><a name="t3"></a> Tabla 3. </b>Eventos CV seg&uacute;n EUA basal y al a&ntilde;o en el estudio LIFE</font></p>     <p align="center"><img src="/fbpe/img/rmc/v140n6/art16-tabla3.jpg" width="320" height="138"></p> 	    
<p align="justify"><font face="verdana" size="3"><b>Estudios en Chile</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En Concepci&oacute;n, se encontr&oacute; una prevalencia de 24% de MA definida como &gt; 30 mg/g, en un estudio transversal de 27.894 pacientes adultos (65% mujeres), de los cuales 58,5% se controlaban en el programa de salud CV. La MA se correlacion&oacute; con una VFG estimada menor a 60 ml/min<sup>67</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">En Santiago, en un an&aacute;lisis retrospectivo de 269 consultantes en los cuales se le solicit&oacute; MA en un a&ntilde;o calendario, result&oacute; positiva en 20,8%. La MA se correlacion&oacute; con el n&uacute;mero de FRCV (Dr. E. Lorca. Comunicaci&oacute;n personal).</font></p>  	    <p align="justify"><font face="verdana" size="2">En la Encuesta Nacional de Salud 2009 se midi&oacute; la MA, pero estos resultados a&uacute;n no se conocen.</font></p>  	    <p align="justify"><font face="verdana" size="3"><b>Gu&iacute;as cl&iacute;nicas chilenas y MA</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La gu&iacute;a de HTA recomienda su medici&oacute;n como marcador de da&ntilde;o de &oacute;rgano blanco, y la gu&iacute;a de DM menciona que: "La determinaci&oacute;n de MA persistente es un &iacute;ndice de nefropat&iacute;a incipiente". Las actuales tablas de riesgo coronario en DM considera que deben sumarse 3 puntos a la estratificaci&oacute;n de Framingham si presenta MA, confiri&eacute;ndole un mayor riesgo<sup>68</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">La gu&iacute;a de ERC aconseja su evaluaci&oacute;n siempre en el contexto de otros factores de riesgo renal y CV, y en caso de resultar positiva efectuar una estrategia terap&eacute;utica multifactorial que controle </font><font face="verdana" size="2">los FRCV<sup>69</sup>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="3"><b>Conclusiones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La MA, cuociente albuminuria y creatininuria, es un biomarcador f&aacute;cil de medir y de bajo costo en una muestra de orina matinal. Este examen permite identificar a hipertensos y/o diab&eacute;ticos con alto riesgo de sufrir ECV. Las intervenciones terap&eacute;uticas que reducen la EUA, particularmente el bloqueo del SRA, pueden disminuir el riesgo asociado a la MA. Ser&iacute;a aconsejable que la EUA se incorporase al seguimiento cl&iacute;nico de hipertensos y/o diab&eacute;ticos.</font></p> 	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="3"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Keane WF, Eknoyan G. Proteinuria, albuminuria, risk, assessment, detection, elimination (PARADE): a position paper of the National Kidney Foundation. Am J Kidney Dis 1999; 33 (5): 1004&#45;10.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600001&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. Montanes Berm&uacute;dez R, Gracia Garc&iacute;a S, P&eacute;rez Surribas D, Mart&iacute;nez Castelao A, Bover Sanjuan J. Consensus Document. Recommendations on assessing proteinuria during the diagnosis and follow&#45;up of chronic kidney disease. Nefrolog&iacute;a 2011; 31 (3): 331&#45;45.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600002&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">3. K/DOQI clinical practice guidelines for chronic kidney disease: evaluation, classification, and stratification. Am J Kidney Dis 2002; 39 (2 Suppl 1): S1&#45;266.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600003&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">4. Glassock RJ. Is the presence of microalbuminuria a relevant marker of kidney disease? Curr Hypertens Rep </font><font face="verdana" size="2">2010; 12 (5): 364&#45;8.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600004&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">5. Redon J. Measurement of microalbuminuria&#45;what the nephrologist should know. Nephrol Dial Transplant </font><font face="verdana" size="2">2006; 21 (3): 573&#45;6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600005&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">6. Cerasola G, Cottone S, Mule G. The progressive pathway of microalbuminuria: from early marker of renal damage to strong cardiovascular risk predictor. J Hypertens 2010; 28 (12): 2357&#45;69.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600006&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">7. Zatz R, Meyer TW, Rennke HG, Brenner BM. Predominance of hemodynamic rather than metabolic factors in </font><font face="verdana" size="2">the pathogenesis of diabetic glomerulopathy. Proc Natl Acad Sci USA 1985; 82 (17): 5963&#45;7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600007&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">8. Anderson S, Brenner BM. Pathogenesis of diabetic glomerulopathy: hemodynamic considerations. Diabetes Metab Rev 1988; 4 (2):163&#45;77.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600008&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">9. Palatini P, Mormino P, Dorigatti F, Santonastaso M, Mos L, De Toni R, et al. Glomerular hyperfiltration predicts the development of microalbuminuria in stage 1 hypertension: the HARVEST. Kidney Int 2006; 70 (3): 578&#45;84.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600009&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">10. Bianchi S, Bigazzi R, Campese VM. Microalbuminuria in essential hypertension: significance, pathophysiology, and therapeutic implications. Am J Kidney Dis. 1999; 34 </font><font face="verdana" size="2">(6): 973&#45;95.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600010&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">11. Gerstein HC, Mann JF, Yi Q, Zinman B, Dinneen SF, Hoogwerf B, et al. Albuminuria and risk of cardiovascular events, death, and heart failure in diabetic and nondiabetic individuals. JAMA 2001; 286 (4): 421&#45;6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600011&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">12. Satchell SC, Tooke JE. What is the mechanism of microalbuminuria in diabetes: a role for the glomerular endothelium? Diabetologia 2008; 51 (5): 714&#45;25.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600012&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">13. Haraldsson B, Nystr&ouml;m J, Deen WM. Properties of the Glomerular Barrier and Mechanisms of Proteinuria. Physiological Reviews 2008; 88 (2): 451&#45;87.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600013&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">14. Stehouwer CD. Endothelial dysfunction in diabetic nephropathy: state of the art and potential significance for non&#45;diabetic renal disease. Nephrol Dial Transplant 2004; 19 (4): 778&#45;81.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600014&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">15. Pedrinelli R, Penno G, Dell'Omo G, Bandinelli S, Giorgi D, Di Bello V, et al. Microalbuminuria and transcapillary albumin leakage in essential hypertension. Hypertension 1999; 34 (3): 491&#45;5.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600015&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">16. Levey AS, Eckardt KU, Tsukamoto Y, Levin A, Coresh J, Rossert J, et al. Definition and classification of chronic kidney disease: a position statement from Kidney Disease: Improving Global Outcomes (KDIGO). Kidney Int 2005; 67 (6): 2089&#45;100.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600016&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">17. Eknoyan G, Hostetter T, Bakris GL, Hebert L, Levey AS, Parving HH, et al. Proteinuria and other markers of chronic kidney disease: a position statement of the national kidney foundation (NKF) and the national institute of diabetes and digestive and kidney diseases (NIDDK). Am J Kidney Dis 2003; 42 (4): 617&#45;22.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600017&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">18. Wachtell K, Ibsen H, Olsen MH, Borch&#45;Johnsen K, </font><font face="verdana" size="2">Lindholm LH, Mogensen CE, et al. Albuminuria and cardiovascular risk in hypertensive patients with left ventricular hypertrophy: the LIFE study. Ann Intern Med 2003; 139 (11): 901&#45;6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600018&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">19. Gerber LM, Johnston K, Alderman MH. Assessment of a new dipstick test in screening for microalbuminuria in patients with hypertension. Am J Hypertens 1998; 11 (11 </font><font face="verdana" size="2">Pt 1): 1321&#45;7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600019&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">20. Mogensen CE, Vestbo E, Poulsen PL, Christiansen C, Damsgaard EM, Eiskjaer H, et al. Microalbuminuria and potential confounders. A review and some observations on variability of urinary albumin excretion. Diabetes Care 1995; 18 (4): 572&#45;81.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600020&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">21. Gansevoort RT, Verhave JC, Hillege HL, Burgerhof JG, Bakker SJ, de Zeeuw D, et al. The validity of screening based on spot morning urine samples to detect subjects with microalbuminuria in the general population. Kidney Int Suppl 2005; 94: S28&#45;35.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600021&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">22. Mogensen CE. Microalbuminuria predicts clinical proteinuria and early mortality in maturity&#45;onset diabetes. N Engl J Med 1984; 310 (6): 356&#45;60.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600022&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">23. Schmitz A, Vaeth M. Microalbuminuria: a major risk factor in non&#45;insulin&#45;dependent diabetes. A 10&#45;year follow&#45;up study of 503 patients. Diabet Med 1988; 5 (2): </font><font face="verdana" size="2">126&#45;34.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600023&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">69. Flores JC, Alvo M, Borja H, Morales J, Vega J, Z&uacute;&ntilde;iga C, et al. Clinical guidelines on identification, management and complications of chronic kidney disease. Rev Med Chile 2009; 137 (1): 137&#45;77.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scieloOrg/php/reflinks.php?refpid=S0034-9887201200060001600069&pid=S0034-98872012000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');"></a>&#160;]<!-- end-ref --></font></p>  <hr align="left" width="30%" size="1" noshade> 	    <p align="justify"><font face="verdana" size="2">Recibido el 2 de agosto de 2011, aceptado el 26 de diciembre de 2011.</font></p>  	<font size="2" face="Verdana"><a href="#top"><img src="/fbpe/img/rmc/v140n6/flecha.jpg" width="15" height="17" border="0"></a><a name="back"></a>Correspondencia:  Dr. Rodrigo Tagle, Departamento de Nefrolog&iacute;a,  Lira 85, Cuarto Piso, Santiago, Chile.  E&#45;mail: <a href="mailto:rtagle@med.puc.cl">rtagle@med.puc.cl</a></font></p> 	    
<p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><strong>Conflictos de Inter&eacute;s: </strong></font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="http://www.smschile.cl/coirevmed/art16-1605-21134-1-SP.pdf" target="_blank">Fernando Gonzalez</a>. </font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="http://www.smschile.cl/coirevmed/art16-1605-21135-1-SP.pdf" target="_blank">Monica Acevedo</a>. </font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="http://www.smschile.cl/coirevmed/art16-1605-21247-1-SP.pdf" target="_blank">Rodrigo Tagle</a>.</font></p>      ]]></body><back>
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