<?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>1688-0390</journal-id>
<journal-title><![CDATA[Revista Médica del Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Méd. Urug.]]></abbrev-journal-title>
<issn>1688-0390</issn>
<publisher>
<publisher-name><![CDATA[Sindicato Médico del Uruguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-03902005000300010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Prevalencia de altas concentraciones de lipoproteína (a) en embarazos complicados con restricción del crecimiento fetal intrauterino]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Otero]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bianchi]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dellepiane]]></surname>
<given-names><![CDATA[Marisa]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pou]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Storch]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pons]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso]]></surname>
<given-names><![CDATA[Justo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lens]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Attarian]]></surname>
<given-names><![CDATA[Datevig]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mota]]></surname>
<given-names><![CDATA[Nora]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ceria]]></surname>
<given-names><![CDATA[Blanca]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrari]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro Especializado en Afecciones de la Hemostasis y Trombosis  ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2005</year>
</pub-date>
<volume>21</volume>
<numero>3</numero>
<fpage>236</fpage>
<lpage>241</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-03902005000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-03902005000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-03902005000300010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La importancia de una circulación placentaria adecuada es de vital relevancia para el crecimiento y la vitalidad del feto. Los mecanismos fibrinolíticos juegan un rol importante en el mantenimiento de una circulación placentaria adecuada. Una defectuosa circulación placentaria se ve con frecuencia en mujeres embarazadas con restricción del crecimiento fetal intra uterino (RCFIU). La lipoproteína (a) [Lp(a)] tiene una acción antifibrinolítica al competir, por su similitud estructural, con la molécula de plasminógeno. Los valores de Lp(a) están determinados genéticamente y mujeres con altos niveles de Lp(a) podrían tener un ambiente fibrinolítico empobrecido en la placenta con la consecuente repercusión en el crecimiento fetal. Objetivo del estudio: establecer la prevalencia de un exceso de Lp(a) en mujeres con RCFIU en quienes no se encontró ninguna causa ginecológica ni endocrina ni autoinmune que lo justificara. Metodología: población control: 50 mujeres con por lo menos dos embarazos normales y sin ningún antecedente de pérdida de embarazo. Población estudio: 30 mujeres embarazadas que cursaban con RCFIU (percentil menor a 10%). La determinación del crecimiento fetal intrauterino se hizo mediante ecografía convencional o ecografía Doppler color en ambas arterias uterinas, fetales y placentarias. Los niveles de Lp(a) en sangre se determinaron por método inmuno-turbidimétrico que utiliza anticuerpos antiLp(a) humana de conejo. [Tina-quant lipoproteína(a) (Diagnóstica Stago)]. Se tomó como valor de corte para la Lp(a), 300 mg/L. Los valores altos de Lp(a) fueron confirmados luego del embarazo cuando los valores hallados eran anormales. Un interrogatorio dirigido a los antecedentes familiares de enfermedades cardiovasculares fue efectuado en todas las pacientes. Resultados: la Lp(a) se encontró en valores superiores a 300 mg/L en 3/50 (6%) de la población control y en 11/30 (36,6%) de las mujeres con RCFIU. Los valores elevados de Lp(a) en las mujeres con RCFIU oscilaron entre 930 y 2.020 mg/L. Los valores elevados de Lp(a) se confirmaron fuera del embarazo en 100% de las mujeres con RCFIU. Todas las mujeres con niveles altos de Lp(a) tenían historia familiar de enfermedades cardiovasculares. Conclusión: existe una asociación significativa de altos niveles de Lp(a) en mujeres con RCFIU. Estudios más completos de los mecanismos fibrinolíticos podrían ser de interés en mujeres con RCFIU.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Background. An adequate placental circulation is vitally important to fetus grow. Fibrinolytic mechanism play an important role in placental circulation. Defective placental circulation is frequently seen in pregnant women with intrauterine fetal grow restriction (IFGR). Lipoprotein(a)[Lp(a)] is an antifibrinolytic activator when competing with plasminogen due to their structural similarities. Lp(a) levels are genetically determined: women with high levels of Lp(a) may present an environment of poor fibrinolytic balance in the placenta, that produces repercussions of fetal grow. Objective: To determine the prevalence of Lp(a) excess in women with IFGR and no ginecologic, endocrine or autoimmune related causes. Methods: Control population: 50 women with at least 2 normal pregnancies and no lost pregnancies. Study population: 30 pregnant women with IFGR (p<10%). Intrauterine fetal grow was determined by conventional or color Doppler echography in both fetal and placental uterine arteries. Serum Lp(a) was measured by immunoturbidimetric metyhods with anti-human Lp(a) antibodies (rabbits) [Tina-quant lipoprotein(a) &ndash; (Diagnostica Stago)]. Cut value of Lp(a) was 300 mg/L. The elevated levels of Lp(a) were confirmed after pregnancy when values found were pathologic. All patients were interviewed to focus on familial heart disease history. Results: Lp(a) was higher than 300 mg/L in 3/50 (6%) of the control population compared to 11/30 (36.6%) of the study population. High levels of Lp(a) in women with IFGR ranged from 930 to 2 020 mg/L. These levels were confirmed after pregnancy in 100% of women with IFGR. All these women had a familial history of heart disease. Conclusion: high levels of Lp(a) are associated with women with IFGR. Further studies on fibrinolytic mechanisms should be of interest for women with IFGR.]]></p></abstract>
<abstract abstract-type="short" xml:lang="fr"><p><![CDATA[Résumé Une circulation placentaire adéquate est d&rsquo;une grande importance pour la croissance et la vitalité du foetus. Introduction: les mécanismes fibrinolytiques jouent un rôle primordial à la circulation placentaire. On repère une mauvaise circulation placentaire chez des femmes enceintes ayant un retard de la croissance foetale in-utero (RCFIU). La lipoprotéine (a) [Lp(a)] a une action antifibrinolytique puisqu&rsquo;elle fait la concurrence, par sa similitude structurale, à la molécule du plasminogène. Les valeurs de Lp(a) sont génétiquement déterminés et des femmes ayant des niveaux élevés de Lp(a) pourraient avoir une ambiance fibrinolyti-que appauvrie au placenta qui détermine la croissance fétale. Le but de ce travail: établir la prévalence d&rsquo;un excès de Lp(a) chez des femmes avec RCFIU chez lesquelles on n&rsquo;a trouvé aucune cause gynécologique ni endocrinienne ni autoimmune le justifiant. Méthodologie: population contrôle: 50 femmes ayant eu au moins deux grossesses normales et sans antécédents de grossesse interrompue. Population cible: 30 femmes enceintes avec RCFIU (percentile moins de 10%). On a déterminé la croissance foetale au moyen d&rsquo;échographie conventionnelle ou échographie Doppler couleur aux deux artères utérines, foetales et placentaires. Les niveaux de Lp(a) dans le sang ont été déterminés par méthode immuno-turbidimétrique qui utilise des anticorps antiLp(a) humaine de lapin. [Tina-quant lipoprotéine(a) (Diagnostique Stago)]. On a pris comme valeur pour la Lp(a), 300mg/L. Les valeurs élevées de Lp(a) ont été confirmées après la grossesse lorsque les valeurs trouvées étaient pathologi-ques. Un questionnaire visant sur les antécédents familiaux de maladies cardio-vasculaires a été présenté à toutes les patientes. Résultats: la Lp(a) qui dépassait 300mg/L a été repérée à 3/50(6%) de la population contrôle et à 11/30(36,6%) chez les femmes avec RCIU. Les valeurs élévées de Lp(a) sont confirmées hors grossesse à 100% des femmes avec RCIU. Toutes avaient une histoire familiale de maladies cardiovasculaires. Conclusion: Il existe une association significative des niveaux élevés de Lp(a) chez des femmes avec RCIU.Des études plus complexes des mécanismes fibrinolytiques pourraient être d&rsquo;intérêt chez des femmes avec RCIU.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[LIPOPROTEÍNA(A)]]></kwd>
<kwd lng="es"><![CDATA[RETARDO DE CRECIMIENTO FETAL]]></kwd>
<kwd lng="es"><![CDATA[COMPLICACIONES DEL EMBARAZO]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <b><font face="Verdana" size="4">     <p>Prevalencia de altas concentraciones de lipoprote&iacute;na (a) en embarazos complicados con restricci&oacute;n del crecimiento fetal intrauterino</p>  </font></b>     <p align="right"><i><font face="Verdana" size="2"><a name="1.-"></a>Dres. Ana Mar&iacute;a Otero</font><a href="#1"><font face="Verdana" size="2">*</font></a><font face="Verdana" size="2">, <a name="2.-"></a>Ana Bianchi</font><a href="#2"><font face="Verdana" size="2">&dagger;</font></a><font face="Verdana" size="2">, <a name="3.-"></a>Marisa Dellepiane</font><a href="#3"><font face="Verdana" size="2">&Dagger;</font></a><font face="Verdana" size="2">, </font></i></p>      <p align="right"><i><font face="Verdana" size="2"><a name="4.-"></a>Ricardo Pou</font><a href="#4"><font face="Verdana" size="2">&sect;</font></a><font face="Verdana" size="2">, Eduardo Storch</font><a href="#4"><font face="Verdana" size="2">&sect;</font></a><font face="Verdana" size="2">, <a name="5.-"></a>Enrique Pons</font><a href="#5"><font face="Verdana" size="2">&para;</font></a><font face="Verdana" size="2">, Justo Alonso</font><a href="#5"><font face="Verdana" size="2">&para;</font></a><font face="Verdana" size="2">, <a name="6.-"></a>Daniela Lens</font><a href="#6"><font face="Verdana" size="2">&dagger;&dagger;</font></a><font face="Verdana" size="2">, <a name="7.-"></a>Lics. Datevig Attarian</font><a href="#7"><font face="Verdana" size="2">&Dagger;&Dagger;</font></a><font face="Verdana" size="2">, Nora Mota</font><a href="#7"><font face="Verdana" size="2">&Dagger;&Dagger;</font></a><font face="Verdana" size="2">, Blanca Ceria</font><a href="#7"><font face="Verdana" size="2">&Dagger;&Dagger;</font></a><font face="Verdana" size="2">, Alicia Ferrari</font><a href="#7"><font face="Verdana" size="2">&Dagger;&Dagger;</font></a></i></p>  <b><font face="Humanst521 BT" size="6">     <p align="right">&nbsp;</p>  </font><font face="Verdana" size="2">     <p align="right">Cl&iacute;nica Ginecotocol&oacute;gica A del Centro Hospitalario Pereira Rossell, Facultad de Medicina y Centro Especializado en Afecciones de la Hemostasis y Trombosis</p>  </font></b>     <p>&nbsp;</p>      <p>&nbsp;</p>  <dir><b><font face="Verdana" size="2">     <p>Resumen</p>  </font></b>     <p><i><font size="2" face="Verdana">La importancia de una circulaci&oacute;n placentaria adecuada es de vital relevancia para el crecimiento y la vitalidad del feto. Los mecanismos fibrinol&iacute;ticos juegan un rol importante en el mantenimiento de una circulaci&oacute;n placentaria adecuada. Una defectuosa circulaci&oacute;n placentaria se ve con frecuencia en mujeres embarazadas con restricci&oacute;n del crecimiento fetal intra uterino (RCFIU). La lipoprote&iacute;na (a) [Lp(a)] tiene una acci&oacute;n antifibrinol&iacute;tica al competir, por su similitud estructural, con la mol&eacute;cula de plasmin&oacute;geno. Los valores de Lp(a) est&aacute;n determinados gen&eacute;ticamente y mujeres con altos niveles de Lp(a) podr&iacute;an tener un ambiente fibrinol&iacute;tico empobrecido en la placenta con la consecuente repercusi&oacute;n en el crecimiento fetal. </font></i></p>      ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Objetivo del estudio:<i> establecer la prevalencia de un exceso de Lp(a) en mujeres con RCFIU en quienes no se encontr&oacute; ninguna causa ginecol&oacute;gica ni endocrina ni autoinmune que lo justificara. </i></font></p>      <p><font size="2" face="Verdana">Metodolog&iacute;a:<i> poblaci&oacute;n control: 50 mujeres con por lo menos dos embarazos normales y sin ning&uacute;n antecedente de p&eacute;rdida de embarazo. Poblaci&oacute;n estudio: 30 mujeres embarazadas que cursaban con RCFIU (percentil menor a 10%). La determinaci&oacute;n del crecimiento fetal intrauterino se hizo mediante ecograf&iacute;a convencional o ecograf&iacute;a Doppler color en ambas arterias uterinas, fetales y placentarias. Los niveles de Lp(a) en sangre se determinaron por m&eacute;todo inmuno-turbidim&eacute;trico que utiliza anticuerpos antiLp(a) humana de conejo. [Tina-quant lipoprote&iacute;na(a)</i> <i>(Diagn&oacute;stica Stago)]. Se tom&oacute; como valor de corte para la Lp(a), 300 mg/L. Los valores altos de Lp(a) fueron confirmados luego del embarazo cuando los valores hallados eran anormales. Un interrogatorio dirigido a los antecedentes familiares de enfermedades cardiovasculares fue efectuado en todas las pacientes.</i></font></p>      <p><font size="2" face="Verdana">Resultados: <i>la Lp(a) se encontr&oacute; en valores superiores a 300 mg/L en 3/50 (6%) de la poblaci&oacute;n control y en 11/30 (36,6%) de las mujeres con RCFIU. Los valores elevados de Lp(a) en las mujeres con RCFIU oscilaron entre 930 y 2.020 mg/L. Los valores elevados de Lp(a) se confirmaron fuera del embarazo en 100% de las mujeres con RCFIU. Todas las mujeres con niveles altos de Lp(a) ten&iacute;an historia familiar de enfermedades cardiovasculares. Conclusi&oacute;n: existe una asociaci&oacute;n significativa de altos niveles de Lp(a) en mujeres con RCFIU. Estudios m&aacute;s completos de los mecanismos fibrinol&iacute;ticos podr&iacute;an ser de inter&eacute;s en mujeres con RCFIU.</i></font></p>      <p><font size="2" face="Verdana"><b>Palabras clave:</b><i> LIPOPROTE&Iacute;NA(A) - efectos adversos.</i></font></p>      <p><font size="2" face="Verdana"><i> RETARDO DE CRECIMIENTO FETAL.</i></font></p>      <p><font size="2" face="Verdana"><i> COMPLICACIONES DEL EMBARAZO.</i></font></p>      <p><font size="2" face="Verdana"><i>&nbsp;</i></font></p>  </dir>      <p align="justify"><font size="2" face="Verdana"><a name="1"></a><a href="#1.-">*</a> Ex Profesor Agregado de Hematolog&iacute;a. Direcci&oacute;n T&eacute;cnica del Centro Especializado en Afecciones de la Hemostasis y Trombosis.</font></p>      <p align="justify"><font size="2" face="Verdana"><a name="2"></a><a href="#2.-">&dagger;</a> Profesor Adjunto de Cl&iacute;nica de Ginecol&oacute;gica y Obstetricia.</font></p>      <p align="justify"><font size="2" face="Verdana"><a name="3"></a><a href="#3.-">&Dagger;</a> Ex Asistente de Cl&iacute;nica de Ginecol&oacute;gica y Obstetricia.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="Verdana"><a name="4"></a><a href="#4.-">&sect;</a> Ex Profesor Agregado de Cl&iacute;nica de Ginecol&oacute;gica y Obstetricia.</font></p>      <p align="justify"><font size="2" face="Verdana"><a name="5"></a><a href="#5.-">&para;</a> Profesor de Cl&iacute;nica de Ginecol&oacute;gica y Obstetricia.</font></p>      <p align="justify"><font size="2" face="Verdana"><a name="6"></a><a href="#6.-">&dagger;&dagger;</a> Profesor Adjunto del Departamento de Medicina.</font></p>      <p align="justify"><font size="2" face="Verdana"><a name="7"></a><a href="#7.-">&Dagger;&Dagger;</a> Licenciada en Laboratorio Cl&iacute;nico.</font></p>      <p align="justify"><font size="2" face="Verdana"><b>Correspondencia: </b>Dra. Ana Mar&iacute;a Otero</font></p>      <p align="justify"><font size="2" face="Verdana">Chucarro 1277 Ap. 402. Montevideo, Uruguay.</font></p>      <p align="justify"><font size="2" face="Verdana">E-mail: <a href="mailto:amob@netgate.com.uy">amob@netgate.com.uy</a></font></p>      <p align="justify"><font size="2" face="Verdana">Recibido: 14/3/05.</font></p>      <p align="justify"><font size="2" face="Verdana">Aceptado: 28/6/05.</font></p>      <p>&nbsp;</p>  <b><font face="Verdana" size="2">     ]]></body>
<body><![CDATA[<p>Introducci&oacute;n</p>  </font></b>     <p align="justify"><font size="2" face="Verdana">En 1999 un estudio caso control mostr&oacute; que los estados de hipercoagulabilidad secundarios a la presencia de los llamados polimorfismos g&eacute;nicos, factor V Leiden, factor II 20210 A y la variante termol&aacute;bil de la metilentetrahidrofolatoreductasa (MTHFR) aumentan el riesgo de preeclam-psia desprendimiento prematuro de placenta (DPPNI) y la restricci&oacute;n del crecimiento fetal intrauterino (RCFIU) as&iacute; como la prematurez<a name="1.--"></a><a href="#bib1">(1)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">El inter&eacute;s en buscar esas y otras causas de trombofilia asociada a la insuficiencia circulatoria placentaria fue en aumento y numerosas publicaciones se han ido sucediendo en el &aacute;mbito internacional(<a name="2-12.--"></a><a href="#bib2">2</a>-<a href="#bib12">12</a>).</font></p>      <p align="justify"><font size="2" face="Verdana">La insuficiencia placentaria es un proceso que lleva a un deterioro progresivo de la transferencia de ox&iacute;geno y nutrientes al feto. Esta hipoxemia fetal es la desencadenante de una restricci&oacute;n del crecimiento fetal intrauterino y de una disminuci&oacute;n progresiva de las demandas metab&oacute;licas. </font></p>      <p align="justify"><font size="2" face="Verdana">La RCFIU es la segunda causa de muerte fetal y prematurez constituyendo una complicaci&oacute;n que se ve en 6% de todos los embarazos. Las consecuencias de la RCFIU pueden verse reflejadas en el futuro crecimiento y desarrollo del reci&eacute;n nacido, sobre todo con repercusi&oacute;n a nivel cardiovascular y neurol&oacute;gico<a href="#bib13">(</a><a name="13.--"></a><a href="#bib13">13)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">El estudio anatomopatol&oacute;gico de la placenta de los fetos con RCFIU muestra una disminuci&oacute;n del tama&ntilde;o de la placenta, infartos placentarios, dep&oacute;sitos de fibrina intervellocitarios con una prevalencia significativamente mayor que en fetos sin RCFIU. </font></p>      <p align="justify"><font size="2" face="Verdana">Tambi&eacute;n se ha observado un engrosamiento de la membrana basal y una hiperplasia del sinciciotrofoblasto. Todos estos hallazgos anat&oacute;micos e histol&oacute;gicos indican una reducci&oacute;n del flujo sangu&iacute;neo placentario en la base de la RCFIU<a href="#bib14">(</a><a name="14.--"></a><a href="#bib14">14)</a>. </font></p>      <p align="justify"><font size="2" face="Verdana">La causa de una disminuci&oacute;n del flujo sangu&iacute;neo placentario y el consiguiente RCFIU puede ser de diferente origen, pero el estudio de las variables de la hemostasis a nivel de la circulaci&oacute;n sangu&iacute;nea de la placenta constituye un punto de atenci&oacute;n cada vez de mayor importancia, sobre todo desde que ya no hay dudas de que la trombofilia favorece m&uacute;ltiples complicaciones gestacionales<a href="#bib15">(</a><a name="15-19.--"></a><a href="#bib15">15-19)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">En contraste con el estudio cada vez m&aacute;s amplio de las causas de trombofilia en las complicaciones vasculares de la placenta, poca informaci&oacute;n hemos encontrado en relaci&oacute;n con las consecuencias que una hipofibrinolisis podr&iacute;a tener en la circulaci&oacute;n placentaria, en la RCFIU y otras causas de hipoxia fetal.</font></p>      <p align="justify"><font size="2" face="Verdana">La lipoprote&iacute;na (a) es un complejo macromolecular que posee una asombrosa similitud con el plasmin&oacute;geno y los genes de ambas prote&iacute;nas, muy pr&oacute;ximos entre s&iacute;, derivan de un gen com&uacute;n ancestral ubicado en el cromosoma 6<a href="#bib20">(</a><a name="20.--"></a><a href="#bib20">20)</a>.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="Verdana">La lipoprote&iacute;na (a) posee un efecto aterog&eacute;nico<a href="#bib21">(</a><a name="21-23.--"></a><a href="#bib21">21-23)</a>,<b> </b>un efecto antifibrinol&iacute;tico y pro coagulante(<a name="24-32.--"></a><a href="#bib24">24</a>-<a href="#bib32">32</a>), y adem&aacute;s act&uacute;a a trav&eacute;s del proceso inflamaci&oacute;n/proliferaci&oacute;n celular<a href="#bib33">(</a><a name="33-35.--"></a><a href="#bib33">33-35)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">El conocimiento cada vez mayor de las causas de hipofibrinolisis y la importancia que &eacute;sta tiene en mantener una circulaci&oacute;n adecuada en la placenta ha sido el motivo de estudio de este trabajo, fijando la atenci&oacute;n en la lipoprote&iacute;na (a) [Lp(a)]<a href="#bib36">(</a><a name="36.--"></a><a href="#bib36">36)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">&nbsp;</font></p>  <b><font face="Verdana" size="2">     <p>Objetivo del estudio</p>  </font></b><font size="2">     <p align="justify"><font face="Verdana">Establecer la prevalencia de niveles altos de [Lp(a)] en mujeres con RCFIU, en quienes no se encontr&oacute; ninguna causa ginecol&oacute;gica ni endocrina ni autoinmune de RCFIU.</font></p>      <p align="justify">&nbsp;</p>  </font><b><font face="Verdana" size="2">     <p>Material y m&eacute;todo</p>  </font></b><font size="2">     <p align="justify"><font face="Verdana">Poblaci&oacute;n estudio: 30 mujeres embarazadas que presentaban una RCFIU (percentil menor a 10% para su edad gestacional), en quienes se descart&oacute; previamente una causa gen&eacute;tica, endocrina o autoinmune. Edad media 31 a&ntilde;os.</font></p>      <p align="justify"><font face="Verdana">Poblaci&oacute;n control: 50 mujeres con por lo menos dos embarazos normales y sin ning&uacute;n antecedente de p&eacute;rdida de embarazo ni RCFIU. Edad media 33 a&ntilde;os.</font></p>      <p align="justify"><font face="Verdana">La determinaci&oacute;n de la RCFIU se realiz&oacute; por eco Doppler color (FA 9900 Madison color doppler) en ambas arterias uterinas, fetales y placentarias as&iacute; como la medici&oacute;n de los percentiles de crecimiento correspondientes a cada edad de gestaci&oacute;n. </font> </p>      ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana">Los niveles de [Lp(a)] en sangre se determinaron por m&eacute;todo inmuno-turbidim&eacute;trico que utiliza anticuerpos antiLp(a) humana de conejo. [Tina-quant lipoprote&iacute;na(a) (Diagn&oacute;stica Stago)]. Valor de corte para la Lp(a): 300 mg/L</font></p>      <p align="justify"><font face="Verdana">Los valores altos de [Lp(a)] fueron confirmados "altos" en todas las pacientes luego del embarazo cuando los valores durante la gestaci&oacute;n estuvieron por encima del valor de corte. Un interrogatorio dirigido a los antecedentes familiares de enfermedades cardiovasculares fue efectuado en todas las pacientes.</font></p>      <p align="justify">&nbsp;</p>  </font><b><font face="Verdana" size="2">     <p>Resultados</p>  </font></b><font size="2">     <p align="justify"><font face="Verdana">Mediana de [Lp(a)] en la poblaci&oacute;n control fue de 176,9 mg/L (rango 7-860). Mediana de [Lp(a)] en la poblaci&oacute;n con RCFIU fue de 844,0 mg/L (rango 12-2020). p=0,0035* (Mann Whitney Test). [Lp(a)] &gt; 300 m/L se encontr&oacute; en 3/50 (6%) de la poblaci&oacute;n control. [Lp(a)] &gt; 300 mg/L se encontr&oacute; en 11/30 (36,6%) de la poblaci&oacute;n con RCFIU. p=0,0014** OR=9 (IC 95% = 2,3-36,2) Fischer&rsquo;s Exact Test (<a target="_blank" href="/img/revistas/rmu/v21n3/3a10t1.jpg">tabla 1</a>).</font></p>      <p align="justify"><font face="Verdana">Todas las mujeres con valores de [Lp(a)] por encima de 300 mg/L fueron reestudiadas fuera del embarazo y fuera del puerperio. Los valores superiores a 300 mg/L se confirmaron en varias determinaciones en estas pacientes confirmado el origen gen&eacute;tico de estos niveles. </font> </p>      <p align="justify"><font face="Verdana">Todas<i> </i>las mujeres con niveles de [Lp(a)] por encima de 300 mg/L ten&iacute;an historia familiar de enfermedades cardiovasculares (<a target="_blank" href="/img/revistas/rmu/v21n3/3a10g1.jpg">figura 1</a>).</font></p>  </font>     <p align="justify"><font face="Verdana" size="2">    <br>  </font>  </p>  <font size="2">     <p align="justify">&nbsp;</p>  </font>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">    <br>  </font>  </p>  <font size="2">     <p align="justify">&nbsp;</p>  </font><b><font face="Humanst521 BT" size="2">     <p>&nbsp;</p>  </font><font face="Verdana" size="2">      <p>Comentarios</p>  </font></b>     <p align="justify"><font size="2" face="Verdana">La placenta humana es de tipo hemocorial y posee en situaci&oacute;n fisiol&oacute;gica una importante acci&oacute;n fibrinol&iacute;tica que es responsable de mantener la fluidez sangu&iacute;nea necesaria en los lagos placentarios donde se efectuar&aacute; el intercambio nutricional entre la sangre materna y el feto en crecimiento a trav&eacute;s de las ves&iacute;culas coriales.</font></p>      <p align="justify"><font size="2" face="Verdana">Por lo tanto, un compromiso de la fibrinolisis a este nivel podr&iacute;a tener consecuencias sobre el desarrollo adecuado de la placenta y el intercambio fetomaterno. </font></p>      <p align="justify"><font size="2" face="Verdana">La asociaci&oacute;n entre RCFIU y una defectuosa circulaci&oacute;n placentaria evidenciada en el estudio de eco Doppler es un hecho frecuente<a name="37-39.--"></a><a href="#bib37">(37-39)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">La alta prevalencia encontrada en nuestro estudio, de niveles elevados de lipo(a) en mujeres con RCFIU podr&iacute;a estar asociada a una hipofibrinolisis placentaria.</font></p>      <p align="justify"><font size="2" face="Verdana">El sistema fibrinol&iacute;tico juega un papel fundamental en la integridad de los vasos sangu&iacute;neos al evitar la formaci&oacute;n y el dep&oacute;sito de fibrina en la pared vascular. El plasmin&oacute;geno es la prote&iacute;na central de la fibrinolisis y una vez activado se transformar&aacute; en plasmina, una poderosa enzima de acci&oacute;n fibrinol&iacute;tica. Los mecanismos fibrinol&iacute;ticos juegan un rol importante en el mantenimiento de una circulaci&oacute;n placentaria adecuada<a href="#bib40">(</a><a name="40-43.--"></a><a href="#bib40">40-43)</a>.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="Verdana">La lipoprote&iacute;na (a) [Lp(a)] es un complejo macromolecular que posee elementos estructurales de las lipoprote&iacute;nas y del sistema de la coagulaci&oacute;n sangu&iacute;nea.</font></p>      <p align="justify"><font size="2" face="Verdana">Su sorprendente parecido estructural con el plasmin&oacute;geno le permite competir con &eacute;l e impedir o disminuir significativamente la formaci&oacute;n de plasmina y, por lo tanto, frenar el mecanismo fisiol&oacute;gico de la fibrinolisis<a href="#bib44">(</a><a name="44.--"></a><a href="#bib44">44)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">Esta competici&oacute;n en la cual la Lp(a) siempre desplaza al plasmin&oacute;geno se ejerce a diferentes niveles del mecanismo fisiol&oacute;gico:</font></p>  <dir>     <p align="justify"><font size="2" face="Verdana">a) Uni&eacute;ndose en forma irreversible al activador tisular del plasmin&oacute;geno (tPA).</font></p>      <p align="justify"><font size="2" face="Verdana">b) Uni&eacute;ndose directamente a la fibrina e impidiendo que sobre ella se fije plasmin&oacute;geno y tPA.</font></p>      <p align="justify"><font size="2" face="Verdana">c) Uni&eacute;ndose a los receptores celulares del plasmin&oacute;geno presentes en las membranas de endotelio, monocitos y plaquetas donde normalmente el plasmin&oacute;geno es activado por el tPA.</font></p>  </dir>      <p align="justify"><font size="2" face="Verdana">Adem&aacute;s de su acci&oacute;n antifibrinol&iacute;tica la [Lp(a)] tendr&iacute;a una acci&oacute;n pro coagulante al unirse al inhibidor del activador del factor tisular TFPI y de esta manera la activaci&oacute;n de la v&iacute;a extr&iacute;nseca de la coagulaci&oacute;n estar&iacute;a liberada a la formaci&oacute;n excesiva de fibrina<a href="#bib45">(</a><a name="45.--"></a><a href="#bib45">45)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">Esta acci&oacute;n antifibrinol&iacute;tica y pro coagulante de la [Lp(a)] adquiere importancia patol&oacute;gica cuando la misma se encuentra en niveles altos<a href="#bib46">(</a><a name="46-48.--"></a><a href="#bib46">46-48)</a>.</font></p>      <p align="justify"><font size="2" face="Verdana">Los valores de [Lp(a)] est&aacute;n determinados gen&eacute;ticamente y mujeres con altos niveles de Lp(a) podr&iacute;an tener un ambiente fibrinol&iacute;tico empobrecido en la placenta con la consecuente repercusi&oacute;n en el crecimiento fetal. </font></p>      <p align="justify"><font size="2" face="Verdana">Ser&iacute;a interesante evaluar el empleo de f&aacute;rmacos como la heparina, la cual a trav&eacute;s de su acci&oacute;n pro fibrinol&iacute;tica podr&iacute;a estimular la fibrinolisis en estas pacientes.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font size="2" face="Verdana">M&aacute;s estudios ser&aacute;n necesarios para confirmar nuestros hallazgos y ampliar el estudio de la fibrinolisis en mujeres con signos de insuficiencia placentaria.</font></p>      <p align="justify"><font size="2" face="Verdana">&nbsp;</font></p>  <b><font face="Verdana" size="2">     <p>Summary</p>  </font></b><font size="2">     <p align="justify"><font face="Verdana">Background. An adequate placental circulation is vitally important to fetus grow.</font></p>      <p align="justify"><font face="Verdana">Fibrinolytic mechanism play an important role in placental circulation. </font> </p>      <p align="justify"><font face="Verdana">Defective placental circulation is frequently seen in pregnant women with intrauterine fetal grow restriction (IFGR). Lipoprotein(a)[Lp(a)] is an antifibrinolytic activator when competing with plasminogen due to their structural similarities. Lp(a) levels are genetically determined: women with high levels of Lp(a) may present an environment of poor fibrinolytic balance in the placenta, that produces repercussions of fetal grow.</font></p>      <p align="justify"><font face="Verdana">Objective: To determine the prevalence of Lp(a) excess in women with IFGR and no ginecologic, endocrine or autoimmune related causes.</font></p>      <p align="justify"><font face="Verdana">Methods: Control population: 50 women with at least 2 normal pregnancies and no lost pregnancies. Study population: 30 pregnant women with IFGR (p&lt;10%). </font> </p>      <p align="justify"><font face="Verdana">Intrauterine fetal grow was determined by conventional or color Doppler echography in both fetal and placental uterine arteries. Serum Lp(a) was measured by immunoturbidimetric metyhods with anti-human Lp(a) antibodies (rabbits) [Tina-quant lipoprotein(a) &ndash; (Diagnostica Stago)]. Cut value of Lp(a) was 300 mg/L. The elevated levels of Lp(a) were confirmed after pregnancy when values found were pathologic. All patients were interviewed to focus on familial heart disease history.</font></p>      <p align="justify"><font face="Verdana">Results: Lp(a) was higher than 300 mg/L in 3/50 (6%) of the control population compared to 11/30 (36.6%) of the study population. High levels of Lp(a) in women with IFGR ranged from 930 to 2 020 mg/L. These levels were confirmed after pregnancy in 100% of women with IFGR. All these women had a familial history of heart disease.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana">Conclusion: high levels of Lp(a) are associated with women with IFGR. Further studies on fibrinolytic mechanisms should be of interest for women with IFGR.</font></p>  </font><i><font face="Courier New">     <p align="justify">&nbsp;</p>  </font></i><b><font face="Verdana" size="2">     <p>R&eacute;sum&eacute;</p>  </font></b><font size="2">     <p align="justify"><font face="Verdana">Une circulation placentaire ad&eacute;quate est d&rsquo;une grande importance pour la croissance et la vitalit&eacute; du foetus.</font></p>      <p align="justify"><font face="Verdana">Introduction: les m&eacute;canismes fibrinolytiques jouent un r&ocirc;le primordial &agrave; la circulation placentaire. On rep&egrave;re une mauvaise circulation placentaire chez des femmes enceintes ayant un retard de la croissance foetale in-utero (RCFIU). La lipoprot&eacute;ine (a) [Lp(a)] a une action antifibrinolytique puisqu&rsquo;elle fait la concurrence, par sa similitude structurale, &agrave; la mol&eacute;cule du plasminog&egrave;ne. Les valeurs de Lp(a) sont g&eacute;n&eacute;tiquement d&eacute;termin&eacute;s et des femmes ayant des niveaux &eacute;lev&eacute;s de Lp(a) pourraient avoir une ambiance fibrinolyti-que appauvrie au placenta qui d&eacute;termine la croissance f&eacute;tale.</font></p>      <p align="justify"><font face="Verdana">Le but de ce travail: &eacute;tablir la pr&eacute;valence d&rsquo;un exc&egrave;s de Lp(a) chez des femmes avec RCFIU chez lesquelles on n&rsquo;a trouv&eacute; aucune cause gyn&eacute;cologique ni endocrinienne ni autoimmune le justifiant.</font></p>      <p align="justify"><font face="Verdana">M&eacute;thodologie: population contr&ocirc;le: 50 femmes ayant eu au moins deux grossesses normales et sans ant&eacute;c&eacute;dents de grossesse interrompue. Population cible: 30 femmes enceintes avec RCFIU (percentile moins de 10%). On a d&eacute;termin&eacute; la croissance foetale au moyen d&rsquo;&eacute;chographie conventionnelle ou &eacute;chographie Doppler couleur aux deux art&egrave;res ut&eacute;rines, foetales et placentaires. Les niveaux de Lp(a) dans le sang ont &eacute;t&eacute; d&eacute;termin&eacute;s par m&eacute;thode immuno-turbidim&eacute;trique qui utilise des anticorps antiLp(a) humaine de lapin. [Tina-quant lipoprot&eacute;ine(a) (Diagnostique Stago)]. On a pris comme valeur pour la Lp(a), 300mg/L. Les valeurs &eacute;lev&eacute;es de Lp(a) ont &eacute;t&eacute; confirm&eacute;es apr&egrave;s la grossesse lorsque les valeurs trouv&eacute;es &eacute;taient pathologi-ques. Un questionnaire visant sur les ant&eacute;c&eacute;dents familiaux de maladies cardio-vasculaires a &eacute;t&eacute; pr&eacute;sent&eacute; &agrave; toutes les patientes.</font></p>      <p align="justify"><font face="Verdana">R&eacute;sultats: la Lp(a) qui d&eacute;passait 300mg/L a &eacute;t&eacute; rep&eacute;r&eacute;e &agrave; 3/50(6%) de la population contr&ocirc;le et &agrave; 11/30(36,6%) chez les femmes avec RCIU. Les valeurs &eacute;l&eacute;v&eacute;es de Lp(a) sont confirm&eacute;es hors grossesse &agrave; 100% des femmes avec RCIU. Toutes avaient une histoire familiale de maladies cardiovasculaires.</font></p>      <p align="justify"><font face="Verdana">Conclusion: Il existe une association significative des niveaux &eacute;lev&eacute;s de Lp(a) chez des femmes avec RCIU.Des &eacute;tudes plus complexes des m&eacute;canismes fibrinolytiques pourraient &ecirc;tre d&rsquo;int&eacute;r&ecirc;t chez des femmes avec RCIU.</font></p>      <p align="justify">&nbsp;</p>  </font>     ]]></body>
<body><![CDATA[<p><b><font face="Verdana" size="2">Bibliograf&iacute;a</font></b></p>  <dir>     <!-- ref --><p><font face="Verdana" size="2"><a name="bib1"></a><a href="#1.--">1</a>. <b>Kupferminc MJ, Eldor A, Steinman N, Many A, Bar-Am A, Jaffa A, et al.</b> Increased frequency of genetic thrombophilia in women with complications of pregnancy. N Engl J Med 1999; 340(1): 9-13.     </font> </p>      <!-- ref --><p><font face="Verdana" size="2"><a name="bib2"></a><a href="#2-12.--">2</a>. <b>Martinelli P, Grandone E, Colaizzo D, Paladini D, Scianname N, Margaglione M, et al.</b> Familial thrombophilia and the occurrence of fetal growth restriction. Haematologica 2001; 86(4): 428-31.    </font></p>      <!-- ref --><p><font face="Verdana" size="2"><a name="bib3"></a><a href="#2-12.--">3</a>. <b>Infante-Rivard C, Rivard GE, Yotov WV, Genin E, Guiguet M, Weinberg C, et al.</b> Association of thrombophilia polymorphisms with intrauterine growth restriction. 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