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<front>
<journal-meta>
<journal-id>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762004000100014</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[SÍNDROME DE LAS PLAQUETAS PEGAJOSAS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lazo-Langner]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Hematología y Oncología ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>103</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762004000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762004000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762004000100014&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p><font size="2" face="Verdana">Rev Invest Cl&iacute;n 2004; Vol. 56(1):103-104    <br> <b>CARTA AL EDITOR</b></font></p>     <p>&nbsp;</p>     <p><b><font size="4" face="Verdana">S&Iacute;NDROME DE LAS PLAQUETAS PEGAJOSAS</font></b></p>     <p>&nbsp;</p>     <p><b><font size="2" face="Verdana">Dr Alejandro Lazo-Langner    <br> </font></b><font size="2" face="Verdana">Departamento de Hematolog&iacute;a y Oncolog&iacute;a,    <br> Laboratorio de Coagulaci&oacute;n    <br> Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n    <br> Salvador Zubir&aacute;n, Vasco de Quiroga 15,    ]]></body>
<body><![CDATA[<br> Tlalpan 14000, M&eacute;xico, D.F.    <br> Tel.: (5255) 55731200 Ext. 2700, 2220.    <br> Fax: (5255) 5655 6062.    <br> Correo electr&oacute;nico: <a href="mailto:alazo@medscape.com">alazo@medscape.com</a></font>  </p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Al Editor:</font></p>     <p><font size="2" face="Verdana">En el editorial titulado <i> El s</I>&iacute;<i>ndrome de las &quot;plaquetas pegajosas&quot;: Una causa frecuente pero ignorada de trombofilia, </I>          <SUP>1</SUP> los autores hacen varias aseveraciones que deben ser interpretadas con prudencia. Basados en un estudio realizado por ellos mismos, Ruiz-Argüelles y col. afirman que en individuos mexicanos con sospecha cl&iacute;nica de trombofilia primaria 60% de ellos presenta s&iacute;ndrome de las plaquetas pegajosas (SPP), siendo por tanto la condici&oacute;n trombof&iacute;lica m&aacute;s frecuente en M&eacute;xico. <SUP>2</SUP> Sin embargo, dicho estudio solamente incluy&oacute; 10 pacientes y es evidente que con un n&uacute;mero tan reducido de enfermos no se puede hacer tal afirmaci&oacute;n. Si dicha prevalencia fuera cierta, la muestra necesaria para demostrarla ser&iacute;a de varios cientos de pacientes. Adem&aacute;s, existen otras patolog&iacute;as que pueden inducir hiperagregaci&oacute;n plaquetaria y que no fueron tomadas en cuenta en ese estudio, tales como diabetes mellitus, ateroesclerosis, cardiopat&iacute;a isqu&eacute;mica, s&iacute;ndrome nefr&oacute;tico y depresi&oacute;n <SUP>3-5</SUP> y al menos un paciente ten&iacute;a positividad para anticuerpos antifosfol&iacute;pidos, mismos que se sabe inducen agregaci&oacute;n plaquetaria en respuesta a concentraciones muy bajas de trombina. <SUP>6</SUP> Por otra parte, no se sabe cu&aacute;les son los efectos sobre la funci&oacute;n plaquetaria que puedan tener las alteraciones trombof&iacute;licas conocidas y dada la alta frecuencia de dichas alteraciones es esperable encontrar la coexistencia de varias de ellas en un mismo enfermo. Los autores del editorial tambi&eacute;n afirman basados en el mismo estudio que en 80% de los pacientes mexicanos con SPP, dicha condici&oacute;n coexiste con otra trombofilia hereditaria, particularmente heterecigosidad para la mutaci&oacute;n C677T del gen de la metilentetrahidrofolato reductasa (MTHFR). <SUP>2</SUP> En M&eacute;xico, la mutaci&oacute;n MTHFR C677T tiene una prevalencia en la poblaci&oacute;n general de 82.4% para las formas homo y heterocigota en conjunto, <SUP>7</SUP> por lo que no es sorprendente el dato informado por Ruiz-Argüelles y col. </font></p>     <p><font size="2" face="Verdana">La prevalencia real del s&iacute;ndrome de las plaquetas pegajosas (SPP) no se conoce dado que las publicaciones al respecto son muy escasas y en su mayor&iacute;a tienen defectos metodol&oacute;gicos. Un estudio realizado en un grupo de donadores de plaquetas por af&eacute;resis encontr&oacute; una prevalencia de 5-7% en esos donadores, cifras similares a las estimadas en poblaci&oacute;n normal que son de 2 a 10%8 y en este estudio no se señala si existi&oacute; asociaci&oacute;n con eventos tromb&oacute;ticos. En poblaci&oacute;n seleccionada (v.g. con trombosis) existen solamente dos estudios prospectivos, con un total de 348 individuos incluidos, que hayan buscado intencionadamente la presencia de SPP. Las frecuencias halladas var&iacute;an desde 12% en trombosis arteriales perif&eacute;ricas hasta 50% en trombosis retinianas, <SUP>9</SUP>   con una frecuencia global en pacientes con trombosis de todos los territorios de 28%.    <SUP>10</SUP> Este &uacute;ltimo estudio fue realizado en Wayne State University y no en Alemania como señalan los autores del editorial. En el caso de las trombosis venosas profundas la frecuencia es de 14.1% y parece existir una mayor frecuencia en pacientes con trombosis en territorios arteriales. <SUP>9</SUP> En M&eacute;xico solamente existe otro estudio sobre el SPP que fue realizado en nuestro laboratorio en colaboraci&oacute;n con el Instituto Nacional de Neurolog&iacute;a y Neurocirug&iacute;a Manuel Velasco Su&aacute;rez en una cohorte de 50 pacientes con enfermedad cerebrovascular. Los resultados preliminares mostraron una frecuencia de hiperagregabilidad plaquetaria/SPP en 30.6% de los enfermos con eventos arteriales y en 60% de los pacientes con even-tos venosos. <SUP>11</SUP> Sin embargo, el n&uacute;mero de individuos tambi&eacute;n es reducido y este estudio est&aacute; restringido a un subgrupo espec&iacute;fico de pacientes, por lo que los resultados no se pueden generalizar a todos los enfermos con trombosis. </font></p>     <p><font size="2" face="Verdana">Es factible que el SPP, al igual que otras condiciones trombof&iacute;licas, tenga variaciones &eacute;tnicas y que efectivamente se trate de un factor protromb&oacute;tico m&aacute;s, sin embargo, su estudio se dificulta por el hecho de que: </font></p>     <p><font size="2" face="Verdana">1. El m&eacute;todo empleado tiene una pobre reproducibilidad, ya que intervienen m&uacute;ltiples factores que pueden afectar los resultados, incluyendo el mismo daño endotelial. <SUP>12-14    ]]></body>
<body><![CDATA[<br> </SUP></font><font size="2" face="Verdana">2. No existen criterios diagn&oacute;sticos claramente establecidos, aunque probablemente los m&aacute;s usados sean los de Bick. <SUP>9</SUP></font></p>     <p><font size="2" face="Verdana">La observaci&oacute;n de pacientes con SPP ha sido hecha por varios investigadores alrededor del mundo, sin embargo, por lo antes mencionado, no se tiene claro el hecho de que se trate de una verdadera condici&oacute;n, pese a lo acotado por Ruiz-Argüelles y col. <SUP>1</SUP>   y por otros autores,    <SUP>5</SUP> y m&aacute;s bien parecer&iacute;a ser la manifestaci&oacute;n de polimorfismos de glucoprote&iacute;nas y receptores plaquetarios. <SUP>15-18</SUP> Hasta que se disponga de estudios bien diseñados con adecuado n&uacute;mero de pacientes, de criterios diagn&oacute;sticos bien establecidos y de pruebas de laboratorio con una buena reproducibilidad, los datos publicados sobre el SPP deben ser interpretados con precauci&oacute;n.</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>REFERENCIAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana">1. 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<given-names><![CDATA[GJ]]></given-names>
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<source><![CDATA[Rev Invest Clin]]></source>
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