<?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>0120-5633</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Colomb. Cardiol.]]></abbrev-journal-title>
<issn>0120-5633</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Cardiologia. Oficina de Publicaciones]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56332006000500008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Enfermedad cerebrovascular en Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Cerebrovascular disease in Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Federico A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zarruk]]></surname>
<given-names><![CDATA[Juan G]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintero]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arenas]]></surname>
<given-names><![CDATA[William]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rueda-Clausen]]></surname>
<given-names><![CDATA[Cristian F]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Sandra Y]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estupiñán]]></surname>
<given-names><![CDATA[Angélica M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Cardiovascular de Colombia Grupo de Ciencias Neurovasculares ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2006</year>
</pub-date>
<volume>13</volume>
<numero>2</numero>
<fpage>85</fpage>
<lpage>89</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56332006000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56332006000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56332006000500008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: la enfermedad cerebrovascular constituye un problema de salud pública mundial. En Colombia es la cuarta causa de muerte en la población adulta y genera una alta discapacidad en estos pacientes. Objetivo: describir algunos resultados obtenidos por el grupo de Ciencias Neurovasculares de la Fundación Cardiovascular de Colombia. Desarrollo y conclusiones: la enfermedad cerebrovascular es una entidad con una alta prevalencia en la población colombiana y genera discapacidad mental, motora y del lenguaje. Es necesaria la implementación de unidades de cuidado neurovascular con personal entrenado, protocolos definidos, tratamientos adecuados y tecnología de punta. En Colombia deben imponerse este tipo de unidades dentro del cuidado básico de los pacientes para disminuir la morbilidad, mortalidad y discapacidad generada en estos pacientes. La Fundación Cardiovascular de Colombia es pionera en la implementación de este tipo de cuidados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: cerebrovascular disease constitutes a worldwide public health problem. In Colombia, it is the fourth leading cause of death in the adult population and generates high disability in these patients. Objective: to describe some results obtained by the Neurovascular Sciences group from the Colombian Cardiovascular Foundation. Development and conclusions: cerebrovascular disease has a high prevalence in the Colombian population and generates mental, motor, and language disabilities. The implementation of neurovascular care units with trained personnel, defined protocols, adequate treatments and high technology, are necessary. This kind of units must be imposed in Colombia as a basic care for these patients in order to decrease morbidity, mortality and disability. The Colombian Cardiovascular Foundation is pioneer in the implementation of these care units.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[enfermedad cerebrovascular isquémica]]></kwd>
<kwd lng="es"><![CDATA[epidemiología]]></kwd>
<kwd lng="es"><![CDATA[fisiopatología]]></kwd>
<kwd lng="es"><![CDATA[unidades de ictus]]></kwd>
<kwd lng="en"><![CDATA[cerebrovascular ischemic disease]]></kwd>
<kwd lng="en"><![CDATA[epidemiology]]></kwd>
<kwd lng="en"><![CDATA[physiopathology]]></kwd>
<kwd lng="en"><![CDATA[ictus unities]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">      <p>       <center>     <font size="4"><b>Enfermedad cerebrovascular en Colombia</b></font>   </center> </p>     <p>       <center>     <font size="3"><b>Cerebrovascular disease in Colombia</b></font>   </center> </p>     <p>       <center>     Federico A. Silva, MD.<sup>(1, 2)</sup>; Juan G. Zarruk, MD.<sup>(1)</sup>;      Carlos Quintero, MD.<sup>(1)</sup>; William Arenas, MD.<sup>(1)</sup>; Cristian      F. Rueda-Clausen MD.<sup>(1)</sup>; Sandra Y. Silva, MD.<sup>(1)</sup>; Ang&eacute;lica      M. Estupi&ntilde;&aacute;n, RN.<sup>(1)</sup>   </center> </p>     <p><sup>(1)</sup> Grupo de Ciencias Neurovasculares, Fundaci&oacute;n Cardiovascular de Colombia.        <br>   <sup>(2)</sup> Universidad Industrial de Santander.</p>     <p><b>Correspondencia</b>: Federico A. Silva Sieger, MD. Calle 155A No. 23-58,    Tercer piso. Instituto de Investigaciones, Fundaci&oacute;n Cardiovascular de    Colombia. Floridablanca, Colombia. Tel&eacute;fono: 577-6399292. Ext.: 308-345.    Fax: 577-6392744. Correo electr&oacute;nico: <a href="mailto:fsilva@fcv.org">fsilva@fcv.org</a></p>     ]]></body>
<body><![CDATA[<p>Recibido: 27/09/06. Aprobado: 09/10/06.</p> <hr size="1">     <p> Introducci&oacute;n: la enfermedad cerebrovascular constituye un problema    de salud p&uacute;blica mundial. En Colombia es la cuarta causa de muerte en    la poblaci&oacute;n adulta y genera una alta discapacidad en estos pacientes.  </p>     <p>Objetivo: describir algunos resultados obtenidos por el grupo de Ciencias Neurovasculares    de la Fundaci&oacute;n Cardiovascular de Colombia. </p>     <p>Desarrollo y conclusiones: la enfermedad cerebrovascular es una entidad con    una alta prevalencia en la poblaci&oacute;n colombiana y genera discapacidad    mental, motora y del lenguaje. Es necesaria la implementaci&oacute;n de unidades    de cuidado neurovascular con personal entrenado, protocolos definidos, tratamientos    adecuados y tecnolog&iacute;a de punta. En Colombia deben imponerse este tipo    de unidades dentro del cuidado b&aacute;sico de los pacientes para disminuir    la morbilidad, mortalidad y discapacidad generada en estos pacientes. La Fundaci&oacute;n    Cardiovascular de Colombia es pionera en la implementaci&oacute;n de este tipo    de cuidados. </p>     <p>Palabras Clave: enfermedad cerebrovascular isqu&eacute;mica, epidemiolog&iacute;a,    fisiopatolog&iacute;a, unidades de ictus. </p> <hr size="1">     <p>Introduction: cerebrovascular disease constitutes a worldwide public health    problem. In Colombia, it is the fourth leading cause of death in the adult population    and generates high disability in these patients.</p>     <p>Objective: to describe some results obtained by the Neurovascular Sciences    group from the Colombian Cardiovascular Foundation.</p>     <p>Development and conclusions: cerebrovascular disease has a high prevalence    in the Colombian population and generates mental, motor, and language disabilities.    The implementation of neurovascular care units with trained personnel, defined    protocols, adequate treatments and high technology, are necessary. This kind    of units must be imposed in Colombia as a basic care for these patients in order    to decrease morbidity, mortality and disability. The Colombian Cardiovascular    Foundation is pioneer in the implementation of these care units.</p>     <p>Key words: cerebrovascular ischemic disease, epidemiology, physiopathology,    ictus unities.</p> <hr size="1">     <p><font size="3"><b>Introducci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p>La Organizaci&oacute;n Mundial de la Salud, define la enfermedad cerebrovascular    como el r&aacute;pido desarrollo de signos focales o globales de compromiso    de la funci&oacute;n cerebral, con s&iacute;ntomas de veinticuatro horas o m&aacute;s    de duraci&oacute;n o que lleven a la muerte, sin otra causa que el origen vascular    (1). La importancia de la enfermedad cerebrovascular se basa en su alta tasa    de recurrencia, el impacto sobre la calidad de vida, la discapacidad que produce    y su alto &iacute;ndice de mortalidad (2-5). </p>     <p>El estudio de la enfermedad cerebrovascular se ha dirigido a entender tanto    los mecanismos moleculares y fisiopatol&oacute;gicos de la isquemia cerebral    y la muerte neuronal, su recuperaci&oacute;n y estrategias de intervenci&oacute;n    farmacol&oacute;gica, as&iacute; como el comportamiento cl&iacute;nico y epidemiol&oacute;gico.    Colombia ha sido uno de los pa&iacute;ses pioneros en los estudios poblacionales    de la enfermedad cerebrovascular en Latinoam&eacute;rica (6-15) (<a href="#figura1">Figura    1</a>). Sin embargo, aunque se ha podido profundizar en el conocimiento poblacional    de esta enfermedad y en el aporte de nuevas estrategias terap&eacute;uticas    agudas y de mantenimiento, a&uacute;n no se logra un cambio sustancial en la    frecuencia y en la discapacidad generada en la poblaci&oacute;n. Esto hace que    la mejor alternativa de intervenci&oacute;n sea la prevenci&oacute;n a trav&eacute;s    del control de los factores de riesgo, la educaci&oacute;n de la poblaci&oacute;n    sobre signos tempranos y la necesidad de acortar los tiempos de atenci&oacute;n    en estos pacientes. </p>     <p>       <center>     <a name="figura1"></a> <img src="/img/revistas/rcca/v13n2/a8f1.jpg">   </center> </p>     <p>A partir de los estudios epidemiol&oacute;gicos previos sobre enfermedad cerebrovascular    en Colombia, se dise&ntilde;&oacute; un estudio transversal y multic&eacute;ntrico,    que permitiera obtener evidencia acerca del impacto de los factores de riesgo    cl&aacute;sicos y emergentes, en una muestra de poblaci&oacute;n colombiana    con enfermedad cerebrovascular isqu&eacute;mica (FREC-VI). Este esfuerzo permiti&oacute;,    adem&aacute;s, la estructuraci&oacute;n de una cohorte, que en el mediano plazo    debe aportar informaci&oacute;n adicional acerca del seguimiento y futuro de    este tipo de pacientes.</p>     <p>Durante este proceso se ha crecido desde las perspectivas de la investigaci&oacute;n    y la asistencia cl&iacute;nica, hasta lograr un grupo de investigaci&oacute;n    en ciencias neurovasculares, hoy reconocido y clasificado en categor&iacute;a    B por COLCIENCIAS, y la apertura de la primera unidad de cuidado neurovascular    en el pa&iacute;s. En este art&iacute;culo se describen algunos resultados obtenidos    por el grupo de Ciencias Neurovasculares de la Fundaci&oacute;n Cardiovascular    de Colombia. </p>     <p><font size="3"><b>Patog&eacute;nesis de la isquemia cerebral</b></font></p>     <p>El pron&oacute;stico de los pacientes con enfermedad cerebrovascular depende    de la extensi&oacute;n de la lesi&oacute;n o la severidad de la isquemia, y    los mecanismos lesivos fisiopatol&oacute;gicos posteriores. Una interrupci&oacute;n    del flujo sangu&iacute;neo cerebral y por ende, la carencia de ox&iacute;geno    y glucosa, genera la activaci&oacute;n de v&iacute;as metab&oacute;licas protectoras    y lesivas en las neuronas, que pueden terminar en muerte celular. </p>     <p>La necrosis y muerte neuronal se produce cuando hay una reducci&oacute;n en    el flujo sangu&iacute;neo por debajo de 10 mL/100 g/min. El &aacute;rea afectada    de manera irreversible (centro necr&oacute;tico), se rodea por una zona en la    que la isquemia cerebral es menos marcada; &eacute;sta se conoce como zona de    penumbra. Aunque las neuronas en esta zona se encuentran en un &laquo;silencio    el&eacute;ctrico&raquo;, pueden recuperarse, y son el objetivo directo de las    estrategias terap&eacute;uticas actuales, que por medio de la neuroprotecci&oacute;n    buscan disminuir el tama&ntilde;o del centro necr&oacute;tico impidiendo la    muerte neuronal en la zona de penumbra (16).</p>     <p>Los primeros cambios en el territorio comprometido por la isquemia est&aacute;n    precedidos por una disminuci&oacute;n del ATP celular, lo que lleva a la activaci&oacute;n    de la gluc&oacute;lisis anaerobia, la acidosis y la falla de las bombas de intercambio    i&oacute;nico dependientes de ATP (16). Este proceso va seguido de acumulaci&oacute;n    de iones de potasio (K) en el espacio extracelular y de sodio (Na) en el espacio    intracelular, con lo que se altera el potencial de membrana de las neuronas.    Debido a esto, la c&eacute;lula se mantiene despolarizada por medio de un proceso    conocido como despolarizaci&oacute;n an&oacute;xica; en el mismo proceso se    produce la entrada de calcio (Ca) a las neuronas, y se da inicio al proceso    de apoptosis neuronal. Adem&aacute;s de los mecanismos mencionados, se activan    enzimas (caspasas), genes (bax, bcl-2 y bcl-xl) y se liberan citocinas proinflamatorias    (IL-1, TNF-a), involucradas en el proceso apopt&oacute;tico (16-18).</p>     ]]></body>
<body><![CDATA[<p>En una muestra del estudio FREC-VI (Estudio de Prevalencia de Factores de Riesgo    para enfermedad cerebrovascular isqu&eacute;mica en la poblaci&oacute;n colombiana),    se encontr&oacute; una elevaci&oacute;n significativa de interleuquina 6 (IL6)    y PCR en pacientes con enfermedad cerebrovascular isqu&eacute;mica comparada    con controles sanos; aunque en este estudio los niveles de FNT-a y fibrin&oacute;geno    eran mayores en los casos, no se observ&oacute; una diferencia significativa.    Es importante resaltar que se encontr&oacute; una asociaci&oacute;n de riesgo    para enfermedad cerebrovascular con un odds ratio (OR) de 8,39 (IC 95% 1,38-50,6)    para PCR, 1,45 (IC 95% 1,07-1,95) para IL6 y 1,11 (IC 95% 0,99-1,23) para TNF-a.    Adicionalmente, se observ&oacute; una correlaci&oacute;n significativa entre    los niveles de PCR e IL6 y un mayor grosor de la &iacute;ntima media de la arteria    car&oacute;tida externa derecha (19). </p>     <p><font size="3"><b>Epidemiolog&iacute;a de la enfermedad cerebrovascular</b></font></p>     <p>La incidencia de enfermedad cerebrovascular var&iacute;a en las diferentes    poblaciones estudiadas; se presenta m&aacute;s en hombres, en poblaci&oacute;n    de raza negra, y aumenta exponencialmente con la edad (20-26).</p>     <p> En Latinoam&eacute;rica se reporta una incidencia para enfermedad cerebrovascular    entre 0,89-1,83/1.000 (8;9;27;28). En un estudio realizado en Sabaneta, Antioquia,    en una poblaci&oacute;n de 13.588 sujetos de la misma regi&oacute;n (9), se    encontr&oacute; una incidencia anual ajustada por edad y g&eacute;nero de 0,89/1.000.    En este estudio, el comportamiento en cuanto a g&eacute;nero y edad fue similar    al de otras poblaciones, si bien fue mayor en el g&eacute;nero masculino (1,1/1.000    vs. 0,61/1.000) y se triplic&oacute; sobre los 60 a&ntilde;os. Sin embargo,    se requieren estudios adicionales que permitan obtener un dato de incidencia    de la enfermedad cerebrovascular en Colombia. </p>     <p>Por otro lado, las cifras de prevalencia de enfermedad cerebrovascular reportadas    en Latinoam&eacute;rica, est&aacute;n en un rango de 1,7 a 6,5/1.000 (8, 29).    En Colombia se han realizado m&uacute;ltiples estudios de prevalencia de enfermedades    neurol&oacute;gicas, en cuya mayor&iacute;a se ha utilizado el protocolo de    la Organizaci&oacute;n Mundial de la Salud para estudios epidemiol&oacute;gicos    de enfermedades neurol&oacute;gicas (30). Los resultados de tales estudios muestran    amplias diferencias en las cifras de prevalencia para enfermedad cerebrovascular    (<a href="#figura1">Figura 1</a>).</p>     <p>Es importante resaltar que la enfermedad cerebrovascular es la tercera causa    de muerte en pa&iacute;ses desarrollados despu&eacute;s de la enfermedad coronaria    y el c&aacute;ncer (31, 32), y se ha estimado que entre 10% y 40% de los pacientes    mueren antes de recibir atenci&oacute;n m&eacute;dica (32). La curva de mortalidad    secundaria a enfermedad cerebrovascular ha mostrado una tendencia a disminuir    en los &uacute;ltimos a&ntilde;os (5). La ca&iacute;da en la tasa de mortalidad    llega hasta el 7% en los pa&iacute;ses desarrollados, comportamiento que no    se ha observado en pa&iacute;ses Latinoamericanos en desarrollo (33). La disminuci&oacute;n    en las curvas de mortalidad en los &uacute;ltimos a&ntilde;os en los pa&iacute;ses    desarrollados, puede explicarse por los avances en el cuidado y tratamiento    agudo de las personas con enfermedad cerebrovascular (34-36) y por la intervenci&oacute;n    de medidas de prevenci&oacute;n y control sobre los factores de riesgo (3).</p>     <p>En Colombia la mortalidad por enfermedad cerebrovascular, ocupa el cuarto lugar    y ocasion&oacute; el 6,7% del total de muertes en 2005 (37). La mortalidad observada    en el estudio de Sabaneta fue 16,2/100.000 habitantes (9). En pacientes con    enfermedad cerebrovascular isqu&eacute;mica, los datos de seguimiento del estudio    FREC-VI, mostraron una mortalidad a dos a&ntilde;os de 30,7% (datos no publicados).  </p>     <p><strong><em>Factores de riesgo </em></strong></p>     <p>Se han logrado identificar como factores de riesgo independientes para enfermedad    cerebrovascular la hipertensi&oacute;n arterial, la enfermedad cardiaca isqu&eacute;mica    y arr&iacute;tmica, la diabetes mellitus, la enfermedad valvular cardiaca y    el abuso de alcohol. Estos factores son el blanco en las estrategias de prevenci&oacute;n    de la enfermedad cerebrovascular. El estudio de casos y controles (FREC-VI),    actualmente en curso en cinco ciudades, ha permitido, por primera vez, obtener    un perfil de los factores de riesgo para enfermedad cerebrovascular isqu&eacute;mica    en Colombia (38). Los principales factores de riesgo en un an&aacute;lisis preliminar,    se resumen en las figuras <a href="#figura2">2</a> y <a href="/img/revistas/rcca/v13n2/a8f3.jpg">3</a>.</p>     <p>       ]]></body>
<body><![CDATA[<center>     <a name="figura2"></a><img src="/img/revistas/rcca/v13n2/a8f2.jpg">   </center> </p>     <p><font size="3"><b>Unidades de cuidado cerebrovascular</b></font></p>     <p>Hoy en d&iacute;a es evidente que intervenir de manera temprana en el ictus    mediante reperfusi&oacute;n del tejido cerebral, tratamientos y estrategias    de neuroprotecci&oacute;n y rehabilitaci&oacute;n temprana, cambia significativamente    el pron&oacute;stico de los pacientes (39-42) con enfermedad cerebrovascular.    En este sentido, surge la necesidad de ubicar esta enfermedad como una emergencia,    la cual requiere para su atenci&oacute;n del reconocimiento como tal y de personal    m&eacute;dico y de apoyo debidamente entrenado, as&iacute; como de protocolos    actualizados e infraestructura, que en conjunto es lo que hoy en d&iacute;a    constituyen las unidades de cuidado cerebrovascular o tambi&eacute;n llamadas    unidades de ictus o stroke. </p>     <p>En los a&ntilde;os 70, surgen las unidades de ictus ante la necesidad de tener    un cuerpo m&eacute;dico entrenado en el manejo especializado de la enfermedad    cerebrovascular (43-45); su efectividad ha sido demostrada al observar una reducci&oacute;n    en la mortalidad del 17% (OR 0,83; IC 95% 0,69-0,98), de la dependencia en 30%    (OR 0,75; IC 95% 0,59-0,83), y de la institucionalizaci&oacute;n posterior en    25% (OR 0,75; IC 95% 0,65-0,87) (46-49). </p>     <p>Como parte del consenso elaborado por la American Stroke Association para el    manejo de la enfermedad cerebrovascular, se insiste en la organizaci&oacute;n    de un sistema de educaci&oacute;n, capacitaci&oacute;n y entrenamiento de la    comunidad general y hospitalaria sobre este tema (50). </p>     <p>A este respecto, una unidad de ictus es un sistema organizado, enfocado en    el manejo temprano y el cuidado adecuado de los pacientes con enfermedad cerebrovascular.    Estas unidades deben estar equipadas con lo necesario para el tratamiento de    un paciente de cuidados intensivos e intermedios y deben asegurarle monitoreo    electrocardiogr&aacute;fico continuo, ventiladores, bombas de infusi&oacute;n,    acceso a tomograf&iacute;a computarizada, resonancia magn&eacute;tica nuclear    y Doppler transcraneal de manera oportuna en el momento de la urgencia. De otro    lado, el recurso humano de estas unidades debe estar conformado por un equipo    m&eacute;dico y param&eacute;dico multidisciplinario entrenado y educado para    manejar la enfermedad cerebrovascular, siguiendo de manera estricta protocolos    previamente dise&ntilde;ados sobre la evidencia disponible. Adem&aacute;s, se    debe generar una cultura de investigaci&oacute;n y actualizaci&oacute;n continuada.  </p>     <p>La Fundaci&oacute;n Cardiovascular de Colombia se ha convertido en la primera    instituci&oacute;n en el pa&iacute;s en crear una unidad de ictus, con equipos    de &uacute;ltima tecnolog&iacute;a y recurso humano altamente capacitado para    el manejo del evento agudo de estos pacientes. </p>     <p><font size="3"><b>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p>1. World Health Organization. Recommendations on stroke prevention, diagnosis,    and therapy. Report of the WHO Task Force on Stroke and other Cerebrovascular    Disorders. 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