<?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>1688-0420</journal-id>
<journal-title><![CDATA[Revista Uruguaya de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Urug.Cardiol.]]></abbrev-journal-title>
<issn>1688-0420</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Uruguaya de Cardiología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-04202015000300017</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fibrilación auricular y su asociación con la declinación cognitiva, deterioro cognitivo y demencia en ausencia de accidente cerebrovascular clínico: revisión de la evidencia y posibles mecanismos]]></article-title>
<article-title xml:lang="en"><![CDATA[Atrial fibrillation and its association with cognitive decline, cognitive impairment, and dementia in the absence of clinical stroke: a review of the evidence and possible mechanisms]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abidi]]></surname>
<given-names><![CDATA[Kashan]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benditt]]></surname>
<given-names><![CDATA[David G]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[Lin Y]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Minnesota Facultad de Medicina Departamento de Medicina]]></institution>
<addr-line><![CDATA[Minneapolis ]]></addr-line>
<country>Estados Unidos</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>397</fpage>
<lpage>403</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-04202015000300017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-04202015000300017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-04202015000300017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La fibrilación auricular (FA) es la arritmia más frecuente en la población adulta. Es sabido que la FA se asocia con un aumento del riesgo de presentar muchos eventos adversos, entre los que se incluyen accidente cerebrovascular, insuficiencia cardíaca, muerte por todas las causas, así como muerte súbita cardíaca. Más recientemente también ha habido un creciente interés en la asociación de FA con deterioro cognitivo y demencia. En esta revisión narrativa describimos la actual evidencia a favor de la relación entre la FA y la declinación cognitiva, el deterioro cognitivo o la demencia en pacientes sin antecedentes de accidente cerebrovascular. Aun cuando no queda muy claro cuáles son los mecanismos exactos que explican la asociación entre la FA y la declinación cognitiva, los mecanismos propuestos incluyen isquemia silente, estado pro inflamatorio, microsangrados cerebrales e hipoperfusión cerebral. Se necesitan más estudios para dilucidar los mecanismos de base que faciliten el descubrimiento de alguna estrategia de prevención.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Atrial fibrillation (AF) is the most common arrhythmia in the adult population. AF is widely known to be associated with an increased risk of many adverse outcomes including stroke, heart failure, all-cause death, as well as sudden cardiac death. More recently, there has also been growing interest in the association of AF with cognitive impairment and dementia. In this narrative review, we describe the current evidence that supports the relationship of AF to cognitive decline, cognitive impairment, or dementia in patients without a history of stroke. The exact mechanisms underlying the association of AF with cognitive decline are unclear; however, proposed mechanisms include silent ischemia, pro-inflammatory state, cerebral microbleeds, and cerebral hypoperfusion. Further research is needed to elucidate the underlying mechanisms to facilitate discovery of prevention strategies.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[DEMENCIA]]></kwd>
<kwd lng="es"><![CDATA[DEMENCIA POR MÚLTIPLES INFARTOS]]></kwd>
<kwd lng="es"><![CDATA[DETERIORO COGNITIVO LEVE]]></kwd>
<kwd lng="es"><![CDATA[FIBRILACIÓN ATRIAL]]></kwd>
<kwd lng="es"><![CDATA[FIBRILACIÓN ATRIAL]]></kwd>
<kwd lng="es"><![CDATA[prevención y control]]></kwd>
<kwd lng="es"><![CDATA[ISQUEMIA CEREBRAL SILENCIOSA]]></kwd>
<kwd lng="en"><![CDATA[ATRIAL FIBRILLATION]]></kwd>
<kwd lng="en"><![CDATA[ATRIAL FIBRILLATION]]></kwd>
<kwd lng="en"><![CDATA[prevention and control]]></kwd>
<kwd lng="en"><![CDATA[DEMENTIA]]></kwd>
<kwd lng="en"><![CDATA[DEMENTIA, MULTI-INFARCT]]></kwd>
<kwd lng="en"><![CDATA[MILD COGNITIVE IMPAIRMENT]]></kwd>
<kwd lng="en"><![CDATA[SILENT CEREBRAL ISCHEMIA]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div class="Section1">      <p><b><span style="font-size: 10pt; font-family: Candara; ">FIBRILACI&Oacute;N AURICULAR&nbsp;</span></b><span style="font-size: 10pt; font-family: Verdana; "> </span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Art&iacute;culo de revisi&oacute;n</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"><b style=""> <span style="font-size: 14pt; font-family: Verdana; ">Fibrilaci&oacute;n auricular y su asociaci&oacute;n con la declinaci&oacute;n cognitiva, deterioro cognitivo y demencia en ausencia de accidente cerebrovascular cl&iacute;nico: revisi&oacute;n de la evidencia y posibles mecanismos</span><o:p></o:p></b></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">Kashan Abidi, David G. Benditt, Lin Y. Chen</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Divisi&oacute;n Cardiovascular, Departamento de Medicina, Facultad de Medicina de la Universidad de Minnesota. </span><st1:city w:st="on"><st1:place w:st="on"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">Minneapolis</span></st1:place></st1:city><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">, Estados Unidos. Correspondencia: Lin Y. Chen, MD, Cardiovascular Division, Department of Medicine, University of Minnesota Medical School, 420 Delaware Street SE, MMC 508, Minneapolis, MN 55455, USA. </span> <span style="font-size: 10pt; font-family: Verdana; ">Correo electr&oacute;nico: </span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"> <a href="mailto:chenx484@umn.edu">chenx484@umn.edu</a><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Resumen&nbsp;</span><o:p></o:p></p>          <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">La fibrilaci&oacute;n auricular (FA) es la arritmia m&aacute;s frecuente en la poblaci&oacute;n adulta. Es sabido que la FA se asocia con un aumento del riesgo de presentar muchos eventos adversos, entre los que se incluyen accidente cerebrovascular, insuficiencia card&iacute;aca, muerte por todas las causas, as&iacute; como muerte s&uacute;bita card&iacute;aca. M&aacute;s recientemente tambi&eacute;n ha habido un creciente inter&eacute;s en la asociaci&oacute;n de FA con deterioro cognitivo y demencia. En esta revisi&oacute;n narrativa describimos la actual evidencia a favor de la relaci&oacute;n entre la FA y la declinaci&oacute;n cognitiva, el deterioro cognitivo o la demencia en pacientes sin antecedentes de accidente cerebrovascular. Aun cuando no queda muy claro cu&aacute;les son los mecanismos exactos que explican la asociaci&oacute;n entre la FA y la declinaci&oacute;n cognitiva, los mecanismos propuestos incluyen isquemia silente, estado pro inflamatorio, microsangrados cerebrales e hipoperfusi&oacute;n cerebral. Se necesitan m&aacute;s estudios para dilucidar los mecanismos de base que faciliten el descubrimiento de alguna estrategia de prevenci&oacute;n.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Palabras clave:&nbsp;    <br>   &nbsp;&nbsp; &nbsp;DEMENCIA    <br>   &nbsp;&nbsp;&nbsp;&nbsp;DEMENCIA POR M&Uacute;LTIPLES INFARTOS    <br>   &nbsp;&nbsp;&nbsp;&nbsp;DETERIORO COGNITIVO LEVE    <br>   &nbsp;&nbsp;&nbsp;&nbsp;FIBRILACI&Oacute;N ATRIAL    <br>   &nbsp;&nbsp;&nbsp;&nbsp;FIBRILACI&Oacute;N ATRIAL / prevenci&oacute;n y control    <br>   &nbsp;&nbsp;&nbsp;&nbsp;ISQUEMIA CEREBRAL SILENCIOSA</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">&nbsp;</span><b style=""><span style="font-size: 12pt; font-family: Verdana; " lang="EN-US">Atrial fibrillation and its association with cognitive decline, cognitive impairment, and dementia in the absence of clinical stroke: a review of the evidence and possible mechanisms&nbsp;</span></b><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"> </span> <o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">Summary&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">Atrial fibrillation (AF) is the most common arrhythmia in the adult population. AF is widely known to be associated with an increased risk of many adverse outcomes including stroke, heart failure, all-cause death, as well as sudden cardiac death. More recently, there has also been growing interest in the association of AF with cognitive impairment and dementia. In this narrative review, we describe the current evidence that supports the relationship of AF to cognitive decline, cognitive impairment, or dementia in patients without a history of stroke. The exact mechanisms underlying the association of AF with cognitive decline are unclear; however, proposed mechanisms include silent ischemia, pro-inflammatory state, cerebral microbleeds, and cerebral hypoperfusion. Further research is needed to elucidate the underlying mechanisms to facilitate discovery of prevention strategies.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">Key words:&nbsp;    <br>   &nbsp;&nbsp; &nbsp;ATRIAL FIBRILLATION    <br>   &nbsp;&nbsp;&nbsp;&nbsp;ATRIAL FIBRILLATION / prevention &amp; control    <br>   &nbsp;&nbsp;&nbsp;&nbsp;DEMENTIA    <br>   &nbsp;&nbsp;&nbsp;&nbsp;DEMENTIA, MULTI-INFARCT    <br>   &nbsp;&nbsp;&nbsp;&nbsp;MILD COGNITIVE IMPAIRMENT    ]]></body>
<body><![CDATA[<br>   &nbsp;&nbsp;&nbsp;&nbsp;SILENT CEREBRAL ISCHEMIA&nbsp;</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana" lang="EN-US">&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;">  <multicol gutter="18" cols="2"></multicol> <span style="font-size: 10pt; font-family: Verdana; ">  Introducci&oacute;n</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">La fibrilaci&oacute;n auricular (FA) es la arritmia m&aacute;s frecuente en Estados Unidos. Casi 2,7 millones de individuos la padecen y es la principal causa de accidente cerebrovascular. Se estima que 25% de la poblaci&oacute;n de 40 a&ntilde;os o m&aacute;s presentar&aacute; FA en alg&uacute;n momento de su <span class="GramE">vida<sup><a name="-1"></a><a name="-2"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#1">1</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#2">2</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Es bien sabido que la FA se asocia con un mayor riesgo de presentar muchos eventos adversos, incluyendo insuficiencia card&iacute;aca, muerte por todas las causas y muerte s&uacute;bita <span class="GramE">card&iacute;aca<sup><a name="-3"></a><a name="-4"></a><a name="-5"></a><a name="-6"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#3">3-6</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. A esta altura, varios estudios han establecido adem&aacute;s una clara asociaci&oacute;n entre la FA y el deterioro cognitivo o la <span class="GramE">demencia<sup><a name="-7"></a><a name="-9"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#7">7</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#9">9</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">El deterioro cognitivo leve (DCL) se define como la alteraci&oacute;n de la memoria de largo plazo que no afecta adversamente las actividades de la vida cotidiana, mientras que la demencia se define como la alteraci&oacute;n de la memoria junto con el deterioro de otros dominios cognitivos que s&iacute; interfieren con las actividades <span class="GramE">cotidianas<sup><a name="-10"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#10">10</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. El DCL es un precursor de la demencia y existe un creciente inter&eacute;s por identificar factores de riesgo que hagan que un DCL avance a demencia. La demencia aflige a 5%-7% de la poblaci&oacute;n mundial. En Estados Unidos hay casi 5 millones de personas afectadas. Seg&uacute;n algunas estimaciones, esta cifra puede aumentar dram&aacute;ticamente en un futuro <span class="GramE">cercano<sup><a name="-11"></a><a name="-12"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#11">11</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#12">12</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Muchos estudios han reportado una significativa asociaci&oacute;n entre la FA y un aumento del riesgo de DCL o demencia. Muchos de estos estudios inclu&iacute;an a pacientes con antecedentes de accidente cerebrovascular <span class="GramE">cl&iacute;nico<sup><a name="-8"></a><a name="-13"></a><a name="-14"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#8">8</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#13">13</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#14">14</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.<sup> </sup>La mayor&iacute;a de los estudios diagnosticaban la FA en base al examen f&iacute;sico, la historia m&eacute;dica, los c&oacute;digos de la Clasificaci&oacute;n Internacional de Enfermedades (CIE) o un &uacute;nico electrocardiograma, mientras que el deterioro cognitivo se diagnosticaba con el Examen Mini Mental (MMSE</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#y_"><sup>*</sup></a></span><span style="font-size: 10pt; font-family: Verdana; ">), y la demencia se clasificaba utilizando los criterios del DSM-IV<a name="-15"></a></span><sup><span style="font-size: 10pt; font-family: Verdana; ">(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#15">15</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Sin embargo, algunos estudios no encontraron ninguna asociaci&oacute;n entre la FA y el <span class="GramE">DCL<sup><a name="-16"></a><a name="-17"></a><a name="-18"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#16">16-18</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Asimismo, hay estudios similares que resultan negativos para la FA y la <span class="GramE">demencia<sup><a name="-19"></a><a name="-20"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#19">19</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#20">20</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;</span></p>      <p style="margin: 0cm 0cm 0.0001pt;"><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; "><a name="y_"></a>* Mini Mental State Examination.&nbsp;</span></p>      <p style="margin: 0cm 0cm 0.0001pt;"><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">A diferencia de las revisiones anteriores que estudiaban la asociaci&oacute;n entre la FA y una menor funci&oacute;n cognitiva en pacientes con accidente cerebrovascular <span class="GramE">cl&iacute;nico<sup><a name="-21"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#21">21</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">,<sup> </sup>esta revisi&oacute;n narrativa resume la evidencia actual a favor de una asociaci&oacute;n independiente de la FA con declinaci&oacute;n cognitiva, DCL, y demencia en individuos sin accidente cerebrovascular cl&iacute;nico. Tambi&eacute;n postularemos algunos posibles mecanismos que podr&iacute;an estar detr&aacute;s de esta asociaci&oacute;n.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;">&nbsp;<span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Estudios observacionales que ajustaron por accidente cerebrovascular cl&iacute;nico&nbsp;</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana">&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">En un estudio de referencia, Ott y colaboradores comunicaron un &iacute;ndice de probabilidad de 2,3 (intervalo de confianza 95%: 1,4 a 3,7) y 1,7 (intervalo de confianza 95%: 1,2 a 2,5) para demencia y DCL, respectivamente, en pacientes con <span class="GramE">FA<sup><a name="-22"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#22">22</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Cuando los autores ajustaron para accidente cerebrovascular no se vio atenuaci&oacute;n de la asociaci&oacute;n entre FA y demencia. El estudio ajust&oacute; para otros factores de riesgo cardiovascular que pudieran disminuir la cognici&oacute;n, entre los que se incluyen cardiopat&iacute;a isqu&eacute;mica, hipertensi&oacute;n y tirotoxicosis. Es interesante destacar que el riesgo fue superior para la enfermedad de Alzheimer que para la demencia vascular (demencia asociada con enfermedad vascular). El estudio tambi&eacute;n caracteriz&oacute; una asociaci&oacute;n ligeramente m&aacute;s fuerte entre la FA y la demencia en las mujeres. Una raz&oacute;n de esa diferencia fue que en las mujeres se indicaron menos anticoagulantes. En el estudio de Framingham se observ&oacute; una diferencia similar, con una mayor incidencia de accidente cerebrovascular en las mujeres con <span class="GramE">FA<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#4">4</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Estudios observacionales que excluyeron a los individuos con accidente cerebrovascular cl&iacute;nico&nbsp;</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana">&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Miyasaka y colaboradores en 2007 investigaron la asociaci&oacute;n entre FA y demencia en ausencia de accidente cerebrovascular cl&iacute;nico. En el estudio se incluyeron los adultos residentes en el condado de Olmsted, Minnesota, a quienes se les diagnostic&oacute; FA entre 1986 y 2000. Se estudiaron en total 2.837 pacientes y se excluyeron los pacientes con antecedentes de accidente cerebrovascular o demencia. La demencia fue el punto final primario. El estudio hall&oacute; que las tasas acumuladas de demencia eran 2,7% al a&ntilde;o y 10,5% a los cinco a&ntilde;os. La demencia pos FA se acompa&ntilde;&oacute; de una mayor <span class="GramE">mortalidad<sup><a name="-23"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#23">23</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>          <p style="margin: 0cm 0cm 0.0001pt;">  <multicol gutter="18" cols="2"></multicol> <span style="font-size: 10pt; font-family: Verdana; ">  En un estudio transversal, Knecht y colaboradores definieron la asociaci&oacute;n de FA con DCL y las alteraciones estructurales encef&aacute;licas en pacientes sin antecedentes de accidente cerebrovascular cl&iacute;nico. Se evaluaron 122 pacientes en total. Se compararon las pruebas neuropsicol&oacute;gicas y la imagenolog&iacute;a cerebral en pacientes con y sin FA. Se constat&oacute; que los pacientes con FA ten&iacute;an un peor desempe&ntilde;o en las funciones de aprendizaje, memoria, atenci&oacute;n y funciones ejecutivas. La imagenolog&iacute;a de estos pacientes tambi&eacute;n mostr&oacute; una reducci&oacute;n del volumen del <span class="GramE">hipocampo<sup><a name="-24"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#24">24</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La fortaleza del estudio es la combinaci&oacute;n de la evidencia tanto cl&iacute;nica como imagenol&oacute;gica para respaldar la asociaci&oacute;n de FA con DCL y demencia.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;">&nbsp;</p>      <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Otro estudio reclut&oacute; a 5.888 participantes mayores de 65 a&ntilde;os, sin FA o accidente cerebrovascular cl&iacute;nico a nivel basal, que fueron seguidos longitudinalmente. A los participantes se les exclu&iacute;a cuando presentaban accidente cerebrovascular. El desenlace primario de este estudio era la puntuaci&oacute;n del MMSE modificada que fue realizada a lo largo de los siete a&ntilde;os de seguimiento. El estudio encontr&oacute; que la puntuaci&oacute;n media del MMSE modificado ca&iacute;a m&aacute;s r&aacute;pidamente en los pacientes con FA comparado con los que no presentaban FA. Una limitaci&oacute;n de este estudio fue que no se excluyeron los pacientes que presentaron accidente cerebrovascular pero que nunca buscaron asistencia <span class="GramE">m&eacute;dica<sup><a name="-25"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#25">25</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">En 2013, Chen y colaboradores analizaron datos de 935 participantes que eran parte del Estudio sobre el Riesgo de Aterosclerosis en las Comunidades (Atherosclerosis Risk in Communities Study), un estudio de cohorte prospectivo basado en la comunidad. A estos participantes se les hicieron pruebas cognitivas e im&aacute;genes de resonancia nuclear magn&eacute;tica (RNM) cerebral entre 1993-1995 y 2004- 2006. Los participantes con diagn&oacute;stico de FA durante el seguimiento tuvieron una mayor tasa de declinaci&oacute;n en las pruebas de Sustituci&oacute;n de S&iacute;mbolos Digitales y de Fluidez de Palabras. Es de destacar que solo los participantes con FA que tuvieron infarto cerebral subcl&iacute;nico (ICS) en la RNM presentaron mayor declinaci&oacute;n cognitiva; los participantes con FA, pero sin ICS en las im&aacute;genes de la RNM, no tuvieron una mayor declinaci&oacute;n cognitiva que los que no ten&iacute;an FA. Por lo tanto, la asociaci&oacute;n de FA con la declinaci&oacute;n cognitiva en los individuos sin accidente cerebrovascular se puede explicar por la presencia o la aparici&oacute;n de ICS, lo que plantea la posibilidad de la anticoagulaci&oacute;n como estrategia para prevenir la declinaci&oacute;n cognitiva en la <span class="GramE">FA<sup><a name="-26"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#26">26</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>          <p style="margin: 0cm 0cm 0.0001pt;">  <multicol gutter="18" cols="2"></multicol> <span style="font-size: 10pt; font-family: Verdana; ">  Marzona y colaboradores analizaron dos ensayos controlados aleatorizados (ONTARGET y TRANSCEND) con una poblaci&oacute;n total de 32.000 pacientes y encontraron que la presencia de FA aumentaba 14% el riesgo de DCL y en 30% la aparici&oacute;n de una nueva demencia. El an&aacute;lisis de subgrupos arroj&oacute; resultados consistentes en pacientes con y sin antecedentes de accidente cerebrovascular. Los autores concluyeron que la FA es un importante factor de riesgo de<span style=""> </span>DCL aun en ausencia de accidente cerebrovascular cl&iacute;nico. Una de las limitaciones del estudio es la ausencia de neuroim&aacute;genes que permitan tener en cuenta el accidente cerebrovascular <span class="GramE">silente<sup><a name="-27"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#27">27</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Mecanismos posibles</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">La aparici&oacute;n de declinaci&oacute;n cognitiva y/o demencia en pacientes con FA es un proceso complejo y multifactorial. A continuaci&oacute;n se presenta un resumen de los posibles mecanismos (</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#fig_1">figura 1</a></span><span style="font-size: 10pt; font-family: Verdana; ">) subyacentes a la asociaci&oacute;n de FA con declinaci&oacute;n cognitiva, DCL y demencia en ausencia de accidente cerebrovascular cl&iacute;nico.&nbsp;</span></p>      <p style="margin: 0cm 0cm 0.0001pt;">&nbsp;</p>      <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; "><a name="fig_1"></a><img style="width: 406px; height: 386px;" alt="" src="/img/revistas/ruc/v30n3/3a17f1.JPG"> </span><span style="font-size: 10pt; font-family: Verdana;"><br style="">   <o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;"><span style="font-size: 10pt; font-family: Verdana;"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"><b> <span style="font-size: 10pt; font-family: Verdana; ">Fen&oacute;meno emb&oacute;lico y estados protromb&oacute;ticos&nbsp;</span></b><b style=""><span style="font-size: 10pt; font-family: Verdana; "> </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></b></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Los accidentes cerebrovasculares son una consecuencia bien establecida de <span class="GramE">FA<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#4">4</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Son adem&aacute;s un factor de riesgo independiente de declinaci&oacute;n cognitiva, incluyendo DCL y <span class="GramE">demencia<sup><a name="-28"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#28">28</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Un posible mecanismo para la asociaci&oacute;n de FA con declinaci&oacute;n cognitiva en pacientes sin antecedentes de accidente cerebrovascular cl&iacute;nico es la isquemia cerebral silente. La ICS se ha asociado con declinaci&oacute;n cognitiva aun en ausencia de <span class="GramE">FA<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#26">26</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los estudios imagenol&oacute;gicos han revelado que los ICS son m&aacute;s frecuentes en los pacientes con FA que en aquellos con ritmo sinusal <span class="GramE">normal<sup><a name="-29"></a><a name="-30"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#26">26</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#29">29</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#30">30</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Gaita y colaboradores publicaron una muy alta prevalencia de ICS en los pacientes con FA: 89% en la FA parox&iacute;stica, 92% en la FA persistente y 46% en ritmo sinusal. Asimismo, el n&uacute;mero de ICS fue m&aacute;s elevado en los pacientes con FA persistente comparado con la FA parox&iacute;stica. La funci&oacute;n cognitiva fue peor en los pacientes con cualquier tipo de FA en esta <span class="GramE">cohorte<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#30">30</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana">&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"><b> <span style="font-size: 10pt; font-family: Verdana; ">Microsangrados cerebrales&nbsp;</span></b><b style=""><span style="font-size: 10pt; font-family: Verdana; "> </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></b></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Cl&aacute;sicamente se ha asociado la FA con el fen&oacute;meno tromboemb&oacute;lico; sin embargo, tambi&eacute;n se ha establecido una fuerte asociaci&oacute;n entre la FA y los microsangrados cerebrales (MSC<span class="GramE">)<sup><a name="-31"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#31">31</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los MSC aparecen como resultado de microangiopat&iacute;a y se los puede identificar como peque&ntilde;as lesiones hipointensas en la RNM ponderada en <span class="GramE">T2<sup><a name="-32"></a><a name="-33"></a><a name="-34"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#32">32-34</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La incidencia de MSC aumenta con la edad; est&aacute;n vinculados a infartos lacunares y hemorragias <span class="GramE">interventriculares<a name="-35"></a><sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#32">32</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#35">35</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Los MSC tambi&eacute;n est&aacute;n fuertemente asociados con la declinaci&oacute;n <span class="GramE">cognitiva<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#31">31</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La FA ha sido asociada con una duplicaci&oacute;n del riesgo de MSC en pacientes con accidente cerebrovascular/accidente isqu&eacute;mico transitorio (AIT)</span><sup><span style="font-size: 10pt; font-family: Verdana; "> (</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#32">32</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#35">35</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp;</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana">&nbsp;</span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"><b> <span style="font-size: 10pt; font-family: Verdana; ">Disminuci&oacute;n de la perfusi&oacute;n cerebral&nbsp;</span></b><b style=""><span style="font-size: 10pt; font-family: Verdana; "> </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></b></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">La FA produce una ca&iacute;da del volumen de eyecci&oacute;n card&iacute;aca debido a la p&eacute;rdida de sincron&iacute;a auriculoventricular y la alteraci&oacute;n del llenado <span class="GramE">ventricular<a name="-36"></a><sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#36">36</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Esto puede llevar a una importante reducci&oacute;n de la perfusi&oacute;n cerebral en pacientes a&ntilde;osos que presentan compromiso de la autorregulaci&oacute;n vascular, tal como demostr&oacute; de la Torre en 2012</span><sup><span style="font-size: 10pt; font-family: Verdana; "><a name="-37"></a>(</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#37">37</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Muchos estudios tambi&eacute;n han destacado las diferencias regionales del flujo sangu&iacute;neo cerebral en pacientes con <span class="GramE">FA<sup><a name="-38"></a><a name="-39"></a><a name="-40"></a><a name="-41"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#38">38-41</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. La velocidad de flujo promedio disminuye significativamente en la arteria cerebral media en los pacientes con FA, seg&uacute;n se demuestra con el Doppler <span class="GramE">transcraneano<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#39">39</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#40">40</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Esta disminuci&oacute;n es m&aacute;s significativa en pacientes j&oacute;venes con FA, tal como demostraron Lavy y <span class="GramE">colaboradores<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#38">38</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Adem&aacute;s, en los pacientes con FA el flujo sangu&iacute;neo se reduce a&uacute;n m&aacute;s en los accidentes cerebrovasculares agudos comparado con los individuos que presentan ritmo sinusal. Esto puede empeorar el efecto de la isquemia cerebral en estos pacientes. Un estudio demostr&oacute; un riesgo significativamente mayor de demencia en pacientes con FA y frecuencia ventricular r&aacute;pida, apoyando el mecanismo de hipoperfusi&oacute;n <span class="GramE">cerebral<sup><a name="-42"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#42">42</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Investigaciones muestran una mejora de la velocidad sangu&iacute;nea cerebral con la <span class="GramE">cardioversi&oacute;n<sup><a name="-43"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#36">36</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#43">43</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;"><b> <span style="font-size: 10pt; font-family: Verdana; ">Otros mecanismos&nbsp;</span></b><b style=""><span style="font-size: 10pt; font-family: Verdana; "> </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></b></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Una serie de marcadores inflamatorios est&aacute;n elevados en la FA, incluyendo PCR, IL-6 y factor de necrosis <span class="GramE">tumoral<sup><a name="-44"></a><a name="-45"></a><a name="-46"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#44">44-46</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Estos marcadores inflamatorios tambi&eacute;n est&aacute;n vinculados a declinaci&oacute;n <span class="GramE">cognitiva<sup><a name="-47"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#47">47</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Se ha demostrado que la PCR est&aacute; elevada en la FA aun cuando se ajuste para otros factores de riesgo <span class="GramE">cardiovascular<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#44">44</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#45">45</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. De similar manera, CD40 L, el factor de von Willebrand, el d&iacute;mero D y el fragmento 1 + 2 de protrombina tambi&eacute;n han demostrado estar elevados en la <span class="GramE">FA<sup><a name="-48"></a><a name="-49"></a><a name="-50"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#48">48-50</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. No queda claro cu&aacute;l es el mecanismo exacto del aumento de los marcadores inflamatorios en la FA ni cu&aacute;l es su impacto sobre la declinaci&oacute;n cognitiva. Algunos estudios indican que la elevaci&oacute;n de los marcadores pro inflamatorios aumenta el riesgo de tromboembolismo, lo que puede explicar la declinaci&oacute;n <span class="GramE">cognitiva<sup><a name="-51"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#49">49</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#51">51</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Tanto el TNF alfa como el factor de von Willebrand son predictores bien establecidos de accidentes cerebrovasculares isqu&eacute;micos, lo que apoya esta <span class="GramE">hip&oacute;tesis<sup><a name="-52"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#51">51</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#52">52</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Otro posible mecanismo incluye el da&ntilde;o de la vasculatura cerebral, que adem&aacute;s de dar lugar a un estado protromb&oacute;tico puede tambi&eacute;n llevar al dep&oacute;sito de amiloide, aumentando la probabilidad de desarrollar demencia vascular y enfermedad de <span class="GramE">Alzheimer<sup><a name="-53"></a><a name="-54"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#53">53</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#54">54</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>            <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">La FA ha sido asociada con vol&uacute;menes bajos de los hipocampos, y tanto la FA como la hipertensi&oacute;n se acompa&ntilde;an de am&iacute;gdalas <span class="GramE">peque&ntilde;as<sup><a name="-55"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#24">24</a></span><span style="font-size: 10pt; font-family: Verdana; ">,</span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#55">55</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Otros estudios han demostrado vol&uacute;menes encef&aacute;licos m&aacute;s peque&ntilde;os en los pacientes con <span class="GramE">FA<sup><a name="-56"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#56">56</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Estos bajos vol&uacute;menes corticales pueden derivar directamente en DCL y aumentan la probabilidad de desarrollar DCL tras un accidente <span class="GramE">cerebrovascular<sup><a name="-57"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#57">57</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Esta asociaci&oacute;n tambi&eacute;n se podr&iacute;a explicar por vol&uacute;menes corticales bajos similares relacionados con la edad y la predisposici&oacute;n a la demencia en la poblaci&oacute;n con FA.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Posibles estrategias de prevenci&oacute;n para la declinaci&oacute;n cognitiva y demencia</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Hay evidencia contradictoria de que la warfarina retarde el avance de la declinaci&oacute;n cognitiva en los <span class="GramE">pacientes<sup>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#27">27</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Un estudio brinda evidencia a favor de la <span class="GramE">warfarina<sup><a name="-58"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#58">58</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. El problema potencial con la warfarina son los valores fluctuantes de INR que predispone a los pacientes a eventos tanto tromb&oacute;ticos como de sangrado. Como los MSC tambi&eacute;n constituyen un mecanismo posible de declinaci&oacute;n cognitiva en estos pacientes, un valor elevado de INR predispone a los pacientes a m&aacute;s microsangrados y por lo tanto a una mayor probabilidad de da&ntilde;o del tejido neural. La informaci&oacute;n acerca del uso de los nuevos anticoagulantes es limitada y se necesitar&aacute;n futuras investigaciones para valorar su efecto sobre la prevenci&oacute;n de la declinaci&oacute;n cognitiva.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Asimismo, en el an&aacute;lisis de subgrupo del estudio AFFIRM no se observaron diferencias entre los pacientes en los que se aplic&oacute; la estrategia de control de frecuencia comparado con la de control del ritmo con agentes antiarr&iacute;tmicos. El ensayo AFFIRM distribuy&oacute; aleatoriamente a 4.060 pacientes y hall&oacute; que el tratamiento de la FA con la estrategia de control del ritmo no arroj&oacute; ventajas en la supervivencia. El riesgo de accidente cerebrovascular estuvo fundamentalmente relacionado con la interrupci&oacute;n de la <span class="GramE">anticoagulaci&oacute;n<sup><a name="-59"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#59">59</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">. Posteriormente, los investigadores de AFFIRM compararon los resultados de MMSE en 245 pacientes y no encontraron ninguna diferencia en el brazo de control del ritmo comparado con el brazo de control de <span class="GramE">frecuencia<sup><a name="-60"></a>(</sup></span></span><sup><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);"><a href="#60">60</a></span><span style="font-size: 10pt; font-family: Verdana; ">)</span></sup><span style="font-size: 10pt; font-family: Verdana; ">.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Conclusiones</span><o:p></o:p></p>        ]]></body>
<body><![CDATA[<p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; ">Hemos encontrado fuertes evidencias de la FA como factor de riesgo de deterioro cognitivo y demencia aun en ausencia de accidente cerebrovascular cl&iacute;nico. Los mecanismos de base no son claros y pueden incluir infartos cerebrales subcl&iacute;nicos y MSC. Se necesitan m&aacute;s estudios que permitan elucidar los mecanismos de base con el objetivo de facilitar el desarrollo de estrategias de prevenci&oacute;n para la declinaci&oacute;n cognitiva relacionada con la FA.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;"><o:p></o:p></span></p>        <p class="MsoNormal"><span style="font-size: 10pt; font-family: Verdana;"><o:p>&nbsp;</o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">Bibliograf&iacute;a</span><o:p></o:p></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="1"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-1">1</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Naccarelli GV, Varker H, Lin J, Schulman KL. </span><span class="GramE">Increasing prevalence of atrial fibrillation and flutter in the <st1:country-region w:st="on"><st1:place w:st="on">United States</st1:place></st1:country-region>.</span> Am J Cardiol 2009<span class="GramE">;104</span>(11): 1534-9.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="2"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-2">2</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Go AS, Mozaffarian D, Roger VL, Benjamin EJ, Berry JD, Borden WB, et al. </span>Heart disease and stroke statistics&mdash;2013 update: a report from the American Heart Association. Circulation 2013; 127(1):e6-e245.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="3"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-3">3</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Chen LY, Sotoodehnia N, B&ugrave;&#382;kov&aacute; P, <st1:place w:st="on"><st1:city w:st="on">Lopez</st1:city>  <st1:state w:st="on">FL</st1:state></st1:place>, Yee LM, Heckbert SR, et al. </span>Atrial fibrillation and the risk of sudden cardiac death: the atherosclerosis risk in communities study and cardiovascular health study. JAMA Intern Med, 2013; 173(1):29-35.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        ]]></body>
<body><![CDATA[<!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="4"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-4">4</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Wolf PA, Abbott RD, Kannel WB.</span> Atrial fibrillation as an independent risk factor for stroke: the Framingham Study. Stroke 1991; 22(8):983-988.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"><span class="GramE"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="5"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-5">5</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Knight BP.</span> Atrial fibrillation in patients with congestive heart failure.</span></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"> <span class="GramE">Pacing Clin Electrophysiol 2003; 26(7 Pt 2):1620-3.    </span>&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>          <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="6"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-6">6</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Benjamin EJ, Wolf PA, D&rsquo;Agostino RB, Silbershatz H, Kannel WB, Levy D. </span>Impact of atrial fibrillation on the risk of death: the Framingham Heart Study. Circulation 1998; 98(10):946-52.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="7"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-7">7</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Elias MF, Sullivan LM, Elias PK, Vasan RS, D&rsquo;Agostino RB, Seshadri S, et al.</span> Atrial fibrillation is associated with lower cognitive performance in the Framingham offspring men. J Stroke Cerebrovasc Dis 2006; 15(5):214-22.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="8"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-8">8</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Bunch TJ, Weiss JP, Crandall BG, May HT, Bair TL, Osborn JS, et al.</span> Atrial fibrillation is independently associated with senile, vascular, and Alzheimer&rsquo;s dementia. Heart Rhythm 2010; 7(4):433-7.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="9"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-9">9</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Dublin S, Anderson ML, Haneuse SJ, Heckbert SR, <st1:street w:st="on"><st1:address w:st="on">Crane PK</st1:address></st1:street>, Breitner JC, et al.</span> Atrial fibrillation and risk of dementia: a prospective cohort study. J Am Geriatr Soc 2011; 59(8):1369-75.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="10"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-10">10</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Gauthier S, Reisberg B, Zaudig M, Petersen RC, Ritchie K, Broich K, et al. </span>Mild cognitive impairment. Lancet 2006; 367(9518):1262-70.    &nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="11"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-11">11</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Imfeld P, Brauchli Pernus YB, Jick SS, Meier CR. </span>Epidemiology, co-morbidities, and medication use of patients with Alzheimer&rsquo;s disease or vascular dementia in the UK. J Alzheimers Dis 2013; 35(3):565-73.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="12"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-12">12</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Hendrie HC. </span><span class="GramE">Epidemiology of dementia and Alzheimer&rsquo;s disease.</span> Am J Geriatr Psychiatry 1998; 6(2 Suppl 1):S3-18.&nbsp; </span><span style="font-size: 10pt; font-family: Verdana;" lang="EN-US"><o:p></o:p></span></p>        <!-- ref --><p style="margin: 0cm 0cm 0.0001pt;"> <span style="font-size: 10pt; font-family: Verdana; " lang="EN-US"><a name="13"></a></span><span style="font-size: 10pt; font-family: Verdana; color: rgb(31, 26, 23);" lang="EN-US"><a href="#-13">13</a></span><span style="font-size: 10pt; font-family: Verdana; " lang="EN-US">.&nbsp;&nbsp;&nbsp;&nbsp;<span style="">Jozwiak A, Guzik P, Mathew A, Wykretowicz A, Wysocki H. </span>Association of atrial fibrillation and focal neurologic deficits with impaired cognitive function in hospitalized patients &sup3;65 years of age. 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