<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402008000200009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tomografía computada multidetector de arterias coronarias: estado del arte. Parte II: Aplicaciones clínicas]]></article-title>
<article-title xml:lang="en"><![CDATA[Multidetector Computed Tomography of Coronary Arteries: state of the art. Second Part: Clinical Applications]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meave González]]></surname>
<given-names><![CDATA[Aloha]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alexánderson Rosas]]></surname>
<given-names><![CDATA[Erick]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Valero]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meléndez Ramírez]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez García]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sierra Fernández]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calleja Torres]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Rojas Castillo]]></surname>
<given-names><![CDATA[Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lamothe Molina]]></surname>
<given-names><![CDATA[Pedro Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera Zarza]]></surname>
<given-names><![CDATA[Mary Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Armas de Ávila]]></surname>
<given-names><![CDATA[Martha]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ochoa López]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Lamadrid]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kimura Hayama]]></surname>
<given-names><![CDATA[Eric]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Tomografía Cardíaca ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Resonancia Magnética ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Medicina Nuclear ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Nacional Autónoma de México (UNAM) Facultad de Medicina Unidad PET-Ciclotrón]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>México</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Departamento de Radiología e Imagen ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<volume>78</volume>
<numero>2</numero>
<fpage>195</fpage>
<lpage>209</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402008000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402008000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402008000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En los inicios de la evaluación de enfermedad coronaria la tomografía computada multidetector de arterias coronarias (TCMD) se limitaba casi exclusivamente a la detección de placas calcificadas en las arterias coronarias con el cálculo del índice de Calcio, cuyo valor por sí solo es limitado. Sin embargo, en la actualidad gracias al advenimiento de nueva tecnología, las aplicaciones clínicas potenciales de este método incluyen la detección de estenosis arterial coronaria, la evaluación de puentes coronarios y la evaluación de anomalías coronarias. La visualización y evaluación reproducible de la luz de los stents coronarios con TCMD aún no es posible en la actualidad, pero tal vez sea una realidad con el desarrollo tecnológico de las nuevas generaciones de tomógrafos. Los resultados publicados al momento son prometedores, sin embargo el creciente entusiasmo generado por este innovador método en la comunidad médica deberá estar acoplado a un entrenamiento adecuado y a métodos de validación y credencialización apropiados.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[At the beginning of the evaluation of Coronary Artery Disease (CAD), Coronary Multidetector Computed Tomography (MDCT) was exclusively used to detect calcified plaques in coronary arteries through the Calcium Score, whose value by itself is limited. Nowadays, thanks to the technological advancements, potential clinical applications, with this method, include detection of coronary arterial stenosis, assessment of coronary bridges, and evaluation of anomalous coronaries. The intraluminal coronary stent evaluation is not possible yet, but this might become possible with the new-generation scanners. At the moment, the published results seem to be promising, nonetheless, the enthusiasm generated by this method should be accompanied by adequate training, as well as by its validation and certification.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tomografía computada]]></kwd>
<kwd lng="es"><![CDATA[Tomografía computada multidetector]]></kwd>
<kwd lng="es"><![CDATA[Tomografía computada coronaria]]></kwd>
<kwd lng="en"><![CDATA[Computed tomography]]></kwd>
<kwd lng="en"><![CDATA[Multidetector computed tomography]]></kwd>
<kwd lng="en"><![CDATA[Coronary computed tomography]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Avances tecnol&oacute;gicos</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Tomograf&iacute;a computada multidetector de arterias coronarias: estado del arte. Parte II: Aplicaciones cl&iacute;nicas</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Multidetector Computed Tomography of Coronary Arteries: state of the art, Second Part: Clinical Applications</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Aloha Meave Gonz&aacute;lez,<sup>*,**</sup> Erick Alex&aacute;nderson Rosas,<sup>*,***,****</sup> M&oacute;nica Rodr&iacute;guez Valero,**** Gabriela Mel&eacute;ndez Ram&iacute;rez,<sup>*,**</sup> Alfonso Mart&iacute;nez Garc&iacute;a,<sup>****</sup> Carlos Sierra Fern&aacute;ndez,<sup>****</sup> Rodrigo Calleja Torres,<sup>****</sup> Leonardo Garc&iacute;a&#150;Rojas Castillo,<sup>****</sup> Pedro Alberto Lamothe Molina,<sup>****</sup> Mary Carmen Herrera Zarza,<sup>*,**</sup> Martha Armas de &Aacute;vila,<sup>*,**</sup> Juan Manuel Ochoa L&oacute;pez,<sup>****</sup> Jorge V&aacute;zquez&#150;Lamadrid,<sup>*****</sup> Eric Kimura Hayama<sup>*,*****</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Tomograf&iacute;a Card&iacute;aca del Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez. Ciudad de M&eacute;xico, M&eacute;xico. </i></font></p>     <p align="justify"><i><font face="verdana" size="2">** Departamento de Resonancia Magn&eacute;tica del Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez. Ciudad de M&eacute;xico, M&eacute;xico. </font></i></p>     ]]></body>
<body><![CDATA[<p align="justify"><i><font face="verdana" size="2">*** Departamento de Medicina Nuclear del Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez. Ciudad de M&eacute;xico, M&eacute;xico. </font></i></p>     <p align="justify"><i><font face="verdana" size="2">**** Unidad PET&#150;Ciclotr&oacute;n, Facultad de Medicina UNAM. Ciudad de M&eacute;xico, M&eacute;xico.</font></i></p>     <p align="justify"><i><font face="verdana" size="2">***** Departamento de Radiolog&iacute;a e Imagen del Instituto Nacional de Ciencias M&eacute;dicas y Nutrici&oacute;n Salvador Zubir&aacute;n. Ciudad de M&eacute;xico, M&eacute;xico.</font></i></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia: </b>    <br>     <i>Dr. Erick Kimura Hayama.     <br>     Departamento de Tomograf&iacute;a Card&iacute;aca,     <br>     Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez.     <br> (INCICH, Juan Badiano N&uacute;m 1, Col. Secci&oacute;n XVI,     <br> Tlalpan 14080, M&eacute;xico, D.F.).</i>    ]]></body>
<body><![CDATA[<br>   Correo electr&oacute;nico: <a href="mailto:chinitokimura@gmail.com">chinitokimura@gmail.com</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido: 27 de junio de 2007     <br> Aceptado: 22 de noviembre de 2007</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En los inicios de la evaluaci&oacute;n de enfermedad coronaria la tomograf&iacute;a computada multidetector de arterias coronarias (TCMD) se limitaba casi exclusivamente a la detecci&oacute;n de placas calcificadas en las arterias coronarias con el c&aacute;lculo del &iacute;ndice de Calcio, cuyo valor por s&iacute; solo es limitado. Sin embargo, en la actualidad gracias al advenimiento de nueva tecnolog&iacute;a, las aplicaciones cl&iacute;nicas potenciales de este m&eacute;todo incluyen la detecci&oacute;n de estenosis arterial coronaria, la evaluaci&oacute;n de puentes coronarios y la evaluaci&oacute;n de anomal&iacute;as coronarias. La visualizaci&oacute;n y evaluaci&oacute;n reproducible de la luz de los <i>stents </i>coronarios con TCMD a&uacute;n no es posible en la actualidad, pero tal vez sea una realidad con el desarrollo tecnol&oacute;gico de las nuevas generaciones de tom&oacute;grafos. Los resultados publicados al momento son prometedores, sin embargo el creciente entusiasmo generado por este innovador m&eacute;todo en la comunidad m&eacute;dica deber&aacute; estar acoplado a un entrenamiento adecuado y a m&eacute;todos de validaci&oacute;n y credencializaci&oacute;n apropiados.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Tomograf&iacute;a computada. Tomograf&iacute;a computada multidetector. Tomograf&iacute;a computada coronaria.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">At the beginning of the evaluation of Coronary Artery Disease (CAD), Coronary Multidetector Computed Tomography (MDCT) was exclusively used to detect calcified plaques in coronary arteries through the Calcium Score, whose value by itself is limited. Nowadays, thanks to the technological advancements, potential clinical applications, with this method, include detection of coronary arterial stenosis, assessment of coronary bridges, and evaluation of anomalous coronaries. The intraluminal coronary stent evaluation is not possible yet, but this might become possible with the new&#150;generation scanners. At the moment, the published results seem to be promising, nonetheless, the enthusiasm generated by this method should be accompanied by adequate training, as well as by its validation and certification. </font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Computed tomography, Multidetector computed tomography. Coronary computed tomography.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Hasta el momento no existen indicaciones plenamente establecidas de la tomograf&iacute;a computada (TC) de arterias coronarias. Sin embargo, la gran mayor&iacute;a de los estudios cl&iacute;nicos se han enfocado en la evaluaci&oacute;n y detecci&oacute;n de placas en las arterias coronarias. El desempe&ntilde;o del m&eacute;todo se ha comparado contra el est&aacute;ndar de oro: la angiograf&iacute;a coronaria invasiva. La gran mayor&iacute;a de los estudios publicados se han realizado en centros m&eacute;dicos con gran experiencia en tomograf&iacute;a coronaria multidetector (TCMD) de arterias coronarias. Si bien los est&aacute;ndares de entrenamiento han sido recientemente propuestos por la <i>American Heart Association </i>(AHA),<sup>1</sup> poco se sabe sobre los requerimientos de entrenamiento, curva de aprendizaje o exactitud del m&eacute;todo en operadores menos experimentados en la realizaci&oacute;n e interpretaci&oacute;n de dichos estudios.</font></p>     <p align="justify"><font face="verdana" size="2"> En los inicios de la evaluaci&oacute;n de enfermedad coronaria, la TCMD se limitaba casi exclusivamente a la detecci&oacute;n de placas calcificadas en las arterias coronarias con el c&aacute;lculo del &iacute;ndice de Calcio, cuyo valor por s&iacute; solo es limitado. Sin embargo, en la actualidad gracias al advenimiento de nueva tecnolog&iacute;a, las aplicaciones cl&iacute;nicas potenciales de este m&eacute;todo incluyen la detecci&oacute;n de estenosis arterial coronaria, la evaluaci&oacute;n de puentes coronarios y la evaluaci&oacute;n de anomal&iacute;as coronarias. La visualizaci&oacute;n y evaluaci&oacute;n reproducible de la luz de los <i>stents </i>coronarios con TCMD a&uacute;n no es posible en la actualidad, pero tal vez sea una realidad con el desarrollo tecnol&oacute;gico de las nuevas generaciones de tom&oacute;grafos. En la <i><a href="/img/revistas/acm/v78n2/a9t1.jpg" target="_blank">Tabla I</a> </i>se resumen las principales indicaciones y contraindicaciones del m&eacute;todo.<sup>2,3&#150;15</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por otra parte, hoy d&iacute;a la TCMD de coraz&oacute;n tambi&eacute;n est&aacute; siendo evaluada y validada en otras &aacute;reas diferentes al estudio de enfermedad coronaria,<sup>15,16</sup> como lo son su rol en morfolog&iacute;a, movilidad y funci&oacute;n card&iacute;aca,<sup>17&#150;20</sup> miocardiopat&iacute;as, valvulopat&iacute;as,<sup>21</sup> enfermedades del pericardio, tumores card&iacute;acos,<sup>8</sup> evaluaci&oacute;n de la placa y remodelaci&oacute;n coronaria,<sup>22,23</sup> dolor tor&aacute;cico agudo,<sup>24</sup> perfusi&oacute;n mioc&aacute;rdica y viabilidad. Sin embargo, en estas aplicaciones, otros m&eacute;todos no invasivos como la ecocardiograf&iacute;a y la resonancia magn&eacute;tica (RM), siguen siendo consideradas como de elecci&oacute;n, reserv&aacute;ndose la TC para indicaciones espec&iacute;ficas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>a) Detecci&oacute;n de estenosis arterial coronaria</b></font></p>     <p align="justify"><font face="verdana" size="2">Antes del a&ntilde;o 2000 la gran mayor&iacute;a de los estudios eran practicados con TC por emisi&oacute;n de haz de electrones (TCEE). Los primeros trabajos con TCMD aparecieron hacia principios de este siglo siendo su objetivo principal mostrar la capacidad t&eacute;cnica del m&eacute;todo para visualizar las arterias coronarias.<sup>25</sup> Actualmente, con el r&aacute;pido desarrollo de la TCMD, pr&aacute;cticamente la totalidad y ahora el objetivo se ha enfocado a la evaluaci&oacute;n del grado de estenosis gracias a la exactitud diagn&oacute;stica del m&eacute;todo. Los resultados de los principales estudios se muestran en la <i><a href="/img/revistas/acm/v78n2/a9t2.jpg" target="_blank">Tabla II</a></i> <sup>26&#150;32</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los reportes iniciales de casi todos estos trabajos fueron llevados a cabo en poblaciones de estudio peque&ntilde;as y pre&#150;seleccionadas, por lo que sus resultados sobrevaloraban la capacidad diagn&oacute;stica del m&eacute;todo. Adem&aacute;s, la sensibilidad (S), especificidad (E), exactitud (Ex) y valores predictivos (VP) reportados correspond&iacute;an &uacute;nicamente a los segmentos valorables, omitiendo de dichos an&aacute;lisis la gran cantidad de segmentos no valorables (aproximadamente 30% de los segmentos). Sin embargo, a la par del desarrollo de tom&oacute;grafos m&aacute;s r&aacute;pidos y de mayor resoluci&oacute;n, los estudios incluyen un mayor n&uacute;mero de pacientes, poblaciones no seleccionadas y los valores de S, E, Ex y VP son calculados incluyendo los segmentos no valorables, los cuales a su vez han disminuido (de aproximadamente 30% en sistemas de 64 detectores a 5% en los equipos de 4 detectores).<sup>33</sup> Por otra parte, adem&aacute;s de los tradicionales an&aacute;lisis por segmento (15 segmentos por paciente de acuerdo a la nomenclatura de la AHA),<sup>34</sup> que pueden tanto mejorar como demeritar la exactitud del m&eacute;todo debido a que agrupan observaciones intraindividuales, cada vez m&aacute;s trabajos incluyen los an&aacute;lisis por paciente <i>(perpatient&#150;based analysis). </i>Estos an&aacute;lisis reflejan de mejor manera la habilidad de la angioTC para reconocer e identificar a aquellos pacientes que padecen de por lo menos una estenosis coronaria significativa <i>(<a href="#f1">Figs. 1</a> y <a href="#f2">2</a>). </i>Esto es de gran importancia, ya que las implicaciones de diagnosticar o no diagnosticar la presencia o ausencia de cualquier obstrucci&oacute;n coronaria significativa son m&aacute;s relevantes desde la perspectiva de cada paciente. El resto de los par&aacute;metros no ha mostrado cambios significativos con el desarrollo tecnol&oacute;gico <i>(<a href="/img/revistas/acm/v78n2/a9t2.jpg" target="_blank">Tabla II</a>). </i>Si bien existe una importante mejor&iacute;a en la resoluci&oacute;n espacial de los tom&oacute;grafos, la estimaci&oacute;n del grado de estenosis sigue siendo cualitativa. No obstante, cada vez existen m&aacute;s programas disponibles dedicados a la evaluaci&oacute;n cuantitativa, no s&oacute;lo del grado de estenosis, sino tambi&eacute;n de m&uacute;ltiples par&aacute;metros de la funci&oacute;n ventricular.</font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v78n2/a9f1.jpg"></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v78n2/a9f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">La mayor parte de las publicaciones emplean un umbral de estenosis &gt; 50% para definir una estenosis como "cl&iacute;nicamente significativa". Debido a que el flujo de reserva coronaria t&iacute;picamente no compromete la luz sino hasta que existe una obstrucci&oacute;n &gt; 70&#150;75%, las sensibilidades y valores predictivos positivos (VPP) de una gran cantidad de estos estudios no permit&iacute;an distinguir a aquellos pacientes candidatos a revascularizaci&oacute;n. Adem&aacute;s del VPP, la especificidad en el an&aacute;lisis por paciente, tambi&eacute;n es relativamente baja en todos los estudios.<sup>33</sup> En otras palabras, la angiograf&iacute;a por TCMD tender&iacute;a a sobreestimar el grado de estenosis<sup>6</sup> con el consecuente incremento de falsos positivos. Sin embargo, en este punto la pregunta que podr&iacute;a surgir es si esos pacientes son en realidad falsos positivos de la TCMD o pacientes no diagnosticados correctamente por angiograf&iacute;a convencional (falsos negativos), debido a que es bien conocida la mejor sensibilidad de la TC en la evaluaci&oacute;n e identificaci&oacute;n de los cambios por aterosclerosis de la pared sobre la angiograf&iacute;a invasiva (por ejemplo, en aquellos pacientes con remodelaci&oacute;n positiva) <i>(<a href="#f3">Fig. 3</a>).<sup>35</sup></i></font></p>     <p align="justify"><font face="verdana" size="2">Pese al relativo bajo desempe&ntilde;o en especificidad y VPP, el principal objetivo del m&eacute;todo diagn&oacute;stico no invasivo ser&iacute;a el de evitar el cateterismo card&iacute;aco en aquellos pacientes que no ameritan de terapias de revascularizaci&oacute;n, y en el contexto cl&iacute;nico, que la TC no dejara de diagnosticar a aquellos pacientes con enfermedad coronaria significativa. De esta forma, a&uacute;n tomando en cuenta los segmentos no valorables, el valor predictivo negativo (VPN) es uniformemente alto en todos los estudios (&gt; 95%),<sup>33</sup> incluso en aquellos pacientes con una moderada a alta probabilidad pre&#150;prueba de padecer de enfermedad arterial coronaria o en aquellos grupos de estudio donde la prevalencia de dicha enfermedad es elevada como en el estudio de Hoffman y cois.<sup>36</sup> Este elevado VPN permitir&iacute;a descartar de manera confiable la presencia de enfermedad coronaria significativa en ausencia de hallazgos visibles por TCMD. Es decir, aquellos pacientes en quienes la angioTC muestra coronarias normales, la angiograf&iacute;a coronaria no ser&iacute;a necesaria.</font></p>     <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v78n2/a9f3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">Por otro lado, el bajo umbral establecido de estenosis coronaria (&lt; 50%) utilizado para definir una estenosis como cl&iacute;nicamente significativa, disminuye la probabilidad de error en la detecci&oacute;n de pacientes que ameritan angiograf&iacute;a coronaria. As&iacute;, la angioTC pudiese reemplazar aquellos cateterismos card&iacute;acos solicitados con el fin de descartar estenosis significativas en pacientes cuyos factores de riesgo coronario sean de probabilidad baja o intermedia, como por ejemplo aquellos pacientes quienes ser&aacute;n sometidos a cirug&iacute;a card&iacute;aca no coronaria, por ejemplo valvulopat&iacute;as o cardiopat&iacute;as cong&eacute;nitas, en aquellos pacientes con miocardiopat&iacute;a de etiolog&iacute;a incierta o en pacientes con dilataci&oacute;n de la ra&iacute;z a&oacute;rtica, en los cuales la canulaci&oacute;n de las coronarias resulta t&eacute;cnicamente dif&iacute;cil <i>(<a href="#f4">Fig. 4</a>). </i>Cabe recalcar que la relaci&oacute;n costo&#150;eficacia del m&eacute;todo para descartar coronariopat&iacute;a en estas situaciones depender&aacute; de las circunstancias particulares de cada instituci&oacute;n, como lo son la prevalencia de la enfermedad, as&iacute; como del costo del estudio y experiencia del personal encargado de la realizaci&oacute;n e interpretaci&oacute;n de dichos ex&aacute;menes.</font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v78n2/a9f4.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">Los trabajos publicados a la fecha muestran resultados de pacientes en donde la angioTC coronaria (ATCC) no necesariamente correspondi&oacute; al estudio inicial. No existen estudios sobre el desempe&ntilde;o diagn&oacute;stico y el costo&#150;beneficio de la ATCC como estudio inicial; y existen pocos trabajos que lo comparen contra las pruebas de estr&eacute;s convencionales.<sup>37 </sup></font></p>     <p align="justify"><font face="verdana" size="2">En la pr&aacute;ctica diaria, el verdadero papel de este novedoso m&eacute;todo ser&iacute;a el de una prueba diagn&oacute;stica en pacientes con factores de riesgo intermedio de Framingham, dolor tor&aacute;cico o s&iacute;ntomas at&iacute;picos, pacientes con pruebas de estr&eacute;s convencionales no concluyentes, o ambos.<sup>38</sup> De acuerdo a los lineamientos de la AHA, recientemente publicados <i>(<a href="#t3">Tabla III</a>), </i>la categor&iacute;a de la TCMD de arterias coronarias en la evaluaci&oacute;n de estenosis coronaria es clase Ha con nivel de evidencia B, en pacientes sintom&aacute;ticos con probabilidad baja a intermedia de padecer una estenosis significativa; y, clase III con nivel de evidencia C, en pacientes asintom&aacute;ticos.<sup>38</sup> Es decir, con la informaci&oacute;n disponible en este momento, la ATCC no est&aacute; indicada en aquellos pacientes asintom&aacute;ticos ni en aquel grupo de pacientes con una alta probabilidad de requerir una intervenci&oacute;n coronaria percut&aacute;nea como aquellos pacientes con angina t&iacute;pica, pacientes isqu&eacute;micos ya conocidos (salvo en la evaluaci&oacute;n de puentes y stents, <i>ver siguiente apartado), </i>pruebas de estr&eacute;s inequ&iacute;vocas en pacientes con riesgo elevado de enfermedad o enfermedad ya conocida, o en aquellos sujetos con hallazgos bioqu&iacute;micos o ECG de un s&iacute;ndrome coronario agudo.</font></p>     <p align="center"><font face="verdana" size="2"><a name="t3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v78n2/a9t3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">La importancia pronostica de la angiograf&iacute;a coronaria selectiva est&aacute; bien establecida, sin embargo a&uacute;n hacen falta estudios similares para ATCC. Por ejemplo, a&uacute;n no es conocido si un manejo agresivo con o sin revascularizaci&oacute;n en pacientes con estenosis de alto grado detectadas incidentalmente en estudios de ATCC, mejoran el desenlace a largo plazo de pacientes asintom&aacute;ticos.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>b) Hemoductos coronarios</b></font></p>     <p align="justify"><font face="verdana" size="2">La permeabilidad a 10 a&ntilde;os de los hemoductos venosos oscila alrededor del 60%, mientras que para los arteriales es mayor (90%). Cl&iacute;nicamente, existe recurrencia del dolor tipo anginoso a un a&ntilde;o en el 24% de los pacientes y en m&aacute;s del 40% de los pacientes a 6 a&ntilde;os.<sup>39</sup> Los s&iacute;ntomas generalmente son debido a progresi&oacute;n de la enfermedad de las coronarias nativas y a enfermedad <i>de novo </i>en los hemoductos venosos, mientras que los injertos arteriales generalmente permanecen libres de enfermedad. Debido a que el pron&oacute;stico cl&iacute;nico est&aacute; relacionado directamente con su permeabilidad y desarrollo de estenosis en el puente, el seguimiento es indispensable. La angiograf&iacute;a coronaria invasiva es hoy d&iacute;a el est&aacute;ndar de oro en el estudio de este grupo de pacientes. Sin embargo, los riesgos asociados al m&eacute;todo y su costo, han motivado la b&uacute;squeda de m&eacute;todos no invasivos alternos. En este contexto, pese a que la TC ha sido investigada para la evaluaci&oacute;n de conductos venosos desde la d&eacute;cada de los 80, s&oacute;lo recientemente la angiograf&iacute;a coronaria con TCMD ha demostrado su utilidad <i>(<a href="/img/revistas/acm/v78n2/a9f5.jpg" target="_blank">Fig. 5</a>). </i>Este m&eacute;todo se ha propuesto debido a que a diferencia de las coronarias nativas, los puentes se encuentran relativamente fijos y no presentan tanta movilidad, su calibre generalmente es mayor y no muestran tanto grado de calcificaci&oacute;n.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Adem&aacute;s de la evaluaci&oacute;n convencional con reconstrucciones multiplanares y en m&aacute;xima intensidad de proyecci&oacute;n (MIP), las t&eacute;cnicas de reformateo 3D y 4D permiten conocer de una manera r&aacute;pida y sencilla la anatom&iacute;a del injerto (sitio de anastomosis proximal y distal), especialmente en aquellos pacientes con m&uacute;ltiples puentes,<sup>40</sup> lo cual ayuda a guiar al hemodinamista en el cateterismo posterior. A diferencia de los estudios con TCEE<sup>41</sup> y equipos multidetector de menos de 16 detectores<sup>42,43 </sup>en donde el porcentaje de puentes no valorables, principalmente los arteriales, era relativamente alto (16 y 43% respectivamente), numerosos estudios enfocados en conocer cu&aacute;l es el papel de la TCMD<sup>44&#150;48</sup> en la evaluaci&oacute;n de los injertos coronarios han demostrado 3 cosas principalmente: 1. La TCMD de &gt; 16 detectores permite diferenciar de manera confiable entre la permeabilidad u oclusi&oacute;n del injerto (sensibilidad del 93&#150;100%, y especificidad (98&#150;100%). 2. Pr&aacute;cticamente el 100% de las anastomosis proximales pueden valorarse adecuadamente, sin embargo, s&oacute;lo el 75% de las anastomosis distales lo son. 3. En el diagn&oacute;stico de estenosis mayor al 50%, en cualquier punto del puente desde la anastomosis proximal hasta la distal, la sensibilidad de la ATCC oscila del 80 al 96%, con una especificidad del 95 al 100%, VPP del 75 al 81% y VPN del 86 al 99%.</font></p>     <p align="justify"><font face="verdana" size="2"> La experiencia con tom&oacute;grafos de 64 detectores (D) a&uacute;n es limitada, sin embargo, los resultados iniciales son prometedores. Con esta tecnolog&iacute;a se puede evaluar pr&aacute;cticamente la totalidad de las anastomosis distales (94%), con valores de sensibilidad (97%), especificidad (89%), VPP (90%) y VPN (97%) adecuados.<sup>49 </sup></font></p>     <p align="justify"><font face="verdana" size="2">En base a estos resultados, la angioTC puede no permitir el estudio de las anastomosis distales en todos los casos. El porcentaje de anastomosis distales no valorables podr&iacute;a en un futuro disminuir con equipos de mayor resoluci&oacute;n espacial y temporal. Por otra parte, la exactitud diagn&oacute;stica depende principalmente de la localization, tipo y n&uacute;mero de clips vasculares, los cuales pueden obstaculizar grandes porciones de los puentes e interferir con la evaluaci&oacute;n segmentaria en b&uacute;squeda de zonas de estenosis. Si la anastomosis distal es paralela al plano de imagen, puede que s&oacute;lo se vea en 1 &oacute; 2 cortes, lo cual a su vez explicar&iacute;a porqu&eacute; en el 25% de los casos no es posible definir la presencia de estenosis en estas anastomosis. Es necesario enfatizar la necesidad de evaluar &uacute;nicamente a aquellos pacientes con frecuencia card&iacute;aca baja y utilizar m&uacute;ltiples fases de reconstrucci&oacute;n, ya que en un porcentaje elevado de los segmentos no valorables la causa es la presencia de artificios por movimiento.<sup>43</sup></font></p>     <p align="justify"><font face="verdana" size="2">De acuerdo a los lineamientos de la AHA, la evaluaci&oacute;n de pacientes con injertos coronarios mediante TCMD es clase lib con nivel de evidencia C.<sup>38</sup></font></p>     <p align="justify"><font face="verdana" size="2">La TC tambi&eacute;n es una herramienta preoperatoria de gran valor que permite optimizar la planeaci&oacute;n quir&uacute;rgica/intervencionista con informaci&oacute;n adicional. Por ejemplo, durante la intervenci&oacute;n quir&uacute;rgica el coraz&oacute;n es llevado a cardioplej&iacute;a, la cual predispone a aterosclerosis en los troncos supraa&oacute;rticos y por ende un mayor riesgo de eventos vasculares cerebrales. La evaluaci&oacute;n prequir&uacute;rgica permite reconocer placas en estos vasos; visualizar la aorta proximal y descartar su patolog&iacute;a (placas de ateroma, aneurismas y/o disecci&oacute;n), ya que este es el sitio donde se realiza la anastomosis proximal en caso de injertos venosos; y conocer el estado, trayecto, tama&ntilde;o y ramas de las arterias mamarias internas y arterias coronarias, as&iacute; como la presencia de puentes mioc&aacute;rdicos, en el caso de seleccionar estos vasos para realizar los injertos.<sup>50&#150;51</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>c) Stents coronarios</b></font></p>     <p align="justify"><font face="verdana" size="2">La angioplast&iacute;a transluminal percut&aacute;nea con colocaci&oacute;n de <i>stent </i>es considerada como la primera l&iacute;nea de tratamiento debido a que es un procedimiento m&iacute;nimamente invasivo. Cada a&ntilde;o se practican en los Estados Unidos cerca de 500 mil procedimientos y del 30&#150;40% de los pacientes tratados desarrollan reestenosis durante el primer a&ntilde;o posterior a la colocaci&oacute;n del stent.<sup>52 </sup>Si bien el &iacute;ndice de re&#150;estenosis intra&#150;stent ha disminuido tras la aparici&oacute;n de stents medicados, &eacute;sta debe de considerarse en aquellos pacientes con dolor tor&aacute;cico recidivante. La visualization no invasiva del lumen del stent ser&iacute;a ideal en este grupo de pacientes. </font></p>     <p align="justify"><font face="verdana" size="2">La TCMD se ha empleado de forma exitosa en la descripci&oacute;n de estenosis intra&#150;stent e incluso de hiperplasia de la &iacute;ntima en stents de mayor tama&ntilde;o, como lo son los il&iacute;acos y carot&iacute;deos.<sup>53 </sup>Sin embargo, en vasos m&aacute;s peque&ntilde;os como lo son las arterias coronarias, la visualizaci&oacute;n adecuada de su luz se encuentra obstaculizada por los artificios de volumen parcial generados por el material met&aacute;lico del stent. Estos artificios de <i>blooming </i>(exageraci&oacute;n de las estructuras hiperdensas), y de "endurecimiento del haz" <i>(beam&#150;hardening) </i>exageran el tama&ntilde;o real del stent y oscurecen su luz, por lo que el grado de estenosis puede sobreestimarse, incluso llegando a generar im&aacute;genes de obstrucci&oacute;n completa.<sup>10,54 </sup>Con la tecnolog&iacute;a actual y con la aplicaci&oacute;n de filtros de reconstrucci&oacute;n adecuados que permiten delimitar mejor los bordes del stent (B46f), la presencia de estos artificios relacionados al stent se han reducido pero no eliminado, sin embargo el &iacute;ndice se&ntilde;al&#150;ruido disminuye por incremento del ruido. El empleo de filtros convencionales de reconstrucci&oacute;n (B30f) ha demostrado recientemente que incrementa el grado de adelgazamiento de la luz del stent hasta en un 37% de la luz real,<sup>55</sup> mientras que experimentos <i>in vitro </i>con el empleo de aquellos filtros que realzan los bordes del stent mejoran la visualizaci&oacute;n de la luz hasta en un 23%.<sup>56</sup> Hoy d&iacute;a, los estudios de TCMD permiten visualizar aproximadamente el 70% de la luz de algunos tipos de stent <i>(<a href="/img/revistas/acm/v78n2/a9f6.jpg" target="_blank">Fig. 6</a>)</i><sup>56,57</sup></font></p>     <p align="justify"><font face="verdana" size="2">La falta de opacificaci&oacute;n de la coronaria distal al stent refleja claramente la re&#150;estenosis u oclusi&oacute;n del stent. Sin embargo, si bien la gran mayor&iacute;a de los estudios iniciales con TCEE asum&iacute;an como permeable un stent cuando se lograba identificar material de contraste distal al mismo,<sup>58&#150;60</sup> hoy d&iacute;a se reconoce que dicho contraste puede deberse a la presencia de flujo colateral. De esta forma, la visualizaci&oacute;n directa de la luz del stent contin&uacute;a consider&aacute;ndose el factor ideal de permeabilidad del mismo. Los principales determinantes para una adecuada visualizaci&oacute;n de la luz del stent son su calibre (&#8805; 3.5 mm), su localization (coronaria izquierda principal, segmento proximal de la descendente anterior (DA), o puentes venosos), as&iacute; como el tipo de stent.<sup>56 </sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Actualmente existen todav&iacute;a pocos trabajos que hayan evaluado el papel de la TCMD en condiciones postintervenci&oacute;n coronaria. Adem&aacute;s, la gran mayor&iacute;a de estos estudios incluyen poblaciones de estudio seleccionadas y peque&ntilde;as.<sup>61</sup>"<sup>65 </sup>Con el empleo de tom&oacute;grafos de &#8805; 16 detectores en pacientes con una alta prevalencia de stents de gran calibre, s&oacute;lo es posible obtener im&aacute;genes de calidad diagn&oacute;stica en el 75% de los pacientes. Para aquellos segmentos valorables, la detecci&oacute;n de una estenosis de por lo menos el 50% tiene una sensibilidad del 78 al 100%, con una especificidad del 92 al 100%. La especificidad disminuye al 75% cuando todos los segmentos coronarios son incluidos para el an&aacute;lisis Si se consideran todos los grados de estenosis intra&#150;stent (&lt; 50%, &gt; 50% y oclusiones completas), el desempe&ntilde;o de la TCMD es bajo, sin embargo &eacute;ste aumenta sustancialmente cuando &uacute;nicamente son consideradas las estenosis significativas, con VPN por arriba del 90% (IC 95%, 84.6&#150;96.8), lo cual permitir&iacute;a a la TCMD descartar de manera confiable aquellos pacientes con estenosis significativas.<sup>62</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por ende, la utilidad cl&iacute;nica actual de la angio&#150;TC est&aacute; limitada &uacute;nicamente a la detecci&oacute;n de oclusi&oacute;n del stent. La evaluaci&oacute;n de estenosis intra&#150;stent&#150;, probablemente pueda ser una realidad con el desarrollo de tom&oacute;grafos con mayor resoluci&oacute;n espacial.<sup>6</sup> Actualmente se encuentran bajo desarrollo equipos prototipo con resoluci&oacute;n espacial hasta de 0.2 mm.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>d) Anomal&iacute;as coronarias</b></font></p>     <p align="justify"><font face="verdana" size="2">Las anomal&iacute;as coronarias son raras (0.3&#150;1.3% de los pacientes) y se asocian a s&iacute;ntomas potencialmente mortales en el 20% de los casos (arritmias, s&iacute;ncope, infarto del miocardio o muerte s&uacute;bita).<sup>66</sup>"<sup>68</sup> De hecho, estas anomal&iacute;as son una de las causas m&aacute;s frecuentes de muerte card&iacute;aca en atletas j&oacute;venes.<sup>69,70</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se agrupan en 3 grandes categor&iacute;as <i>(<a href="/img/revistas/acm/v78n2/a9f7.jpg" target="_blank">Fig. 7</a>): </i>a) origen ectopico desde el seno coronario u otra arteria coronaria b) ausencia de arteria coronaria, y c) origen ect&oacute;pico desde la arteria pulmonar (s&iacute;ndrome de Bland&#150;White&#150;Garland) siendo los 2 primeros grupos los m&aacute;s frecuentes.<sup>66</sup> El curso de aquellas arterias con origen ect&oacute;pico puede subdividirse a su vez en 4 grupos: 1) anterior al tracto de salida del ventr&iacute;culo derecho (curso "anterior" o "prepulmonar"), 2) posterior a la ra&iacute;z a&oacute;rtica (curso "retroa&oacute;rtico"), 3) entre la aorta y la arteria pulmonar (curso "interarterial") <i>(<a href="#f4">Figs. 4</a> y <a href="/img/revistas/acm/v78n2/a9f8.jpg" target="_blank">8</a>) a </i>trav&eacute;s del surco interventricular (curso "septal" o "subpulmonar").<sup>67,68</sup> Otro tipo de anomal&iacute;a corresponde a las f&iacute;stulas arteriovenosas las cuales representan aproximadamente el 13% de todas las anomal&iacute;as.<sup>66</sup> Estas anomal&iacute;as se pueden presentar de forma aislada o asociadas a otras cardiopat&iacute;as cong&eacute;nitas.<sup>67</sup></font></p>     <p align="justify"><font face="verdana" size="2">No en todas ellas se requiere conocer con exactitud su trayecto proximal, de hecho la gran mayor&iacute;a de ellas no son cl&iacute;nicamente importantes.<sup>66</sup> Por ejemplo, cuando la circunfleja se origina del seno de Valsalva derecho o de la porci&oacute;n proximal de la coronaria derecha, su curso es invariablemente retroa&oacute;rtico. En algunos casos es importante determinar si la porci&oacute;n proximal de la coronaria an&oacute;mala se encuentra anterior a la arteria pulmonar, posterior a la aorta, o entre dichos vasos. Esta distinci&oacute;n tiene valor pron&oacute;stico debido a que aquellas coronarias que emergen del lado opuesto a su territorio perfusorio o que muestran un trayecto entre la aorta y la arteria pulmonar, se asocian a un riesgo mayor de isquemia mioc&aacute;rdica y muerte s&uacute;bita, particularmente si el territorio perfusorio abastece la distribuci&oacute;n de la coronaria izquierda.<sup>66,70&#150;72</sup> El mecanismo propuesto es isquemia y su mecanismo fisiopatol&oacute;gico es multifactorial. Durante el ejercicio f&iacute;sico, existe dilataci&oacute;n de la aorta y de la arteria pulmonar debido al incremento del gasto card&iacute;aco, lo cual comprime el ostium y trayecto proximal del vaso an&oacute;malo.<sup>71</sup> Tambi&eacute;n se ha postulado que la hipo&#150;perfusi&oacute;n es debida a una angulaci&oacute;n extrema del origen arterial, ostium con forma de "hendidura", disminuci&oacute;n en el di&aacute;metro del ostium, inserci&oacute;n intramural (dentro de la t&uacute;nica media), y a vasoespasmo coronario resultado de da&ntilde;o endotelial.<sup>70,72</sup> Estos pacientes pueden requerir reimplantes coronarios.<sup>71&#150;73</sup> El otro grupo de anomal&iacute;as que requieren una adecuada evaluaci&oacute;n y reconocimiento anat&oacute;mico son aqu&eacute;llos con origen a partir de la arteria pulmonar y las f&iacute;stulas o malformaciones arteriovenosas de alto flujo.</font></p>     <p align="justify"><font face="verdana" size="2">La angiograf&iacute;a convencional es el m&eacute;todo m&aacute;s com&uacute;nmente empleado en su evaluaci&oacute;n. Sin embargo, su origen puede ser dif&iacute;cil de identificar principalmente en aquellos casos con un "acodamiento" del mismo, y su curso preciso puede ser dif&iacute;cil de delinear debido a la compleja geometr&iacute;a tridimensional mostrada en un plano bidimensional.<sup>68</sup> En manos experimentadas, el diagn&oacute;stico puede establecerse angiogr&aacute;ficamente s&oacute;lo en aproximadamente la mitad de los casos.<sup>67,68</sup> Sin embargo, es un estudio invasivo, potencialmente prolongado y t&eacute;cnicamente dif&iacute;cil, y que puede requerir cat&eacute;teres adicionales as&iacute; como grandes cantidades de material de contraste.<sup>66</sup> La evaluaci&oacute;n no invasiva incluye a la ecocardiograf&iacute;a,<sup>74</sup> a la angioRM y a la angioTC. Las desventajas principales de la ecocardiograf&iacute;a son el ser un m&eacute;todo operador&#150;dependiente, puede requerir un tiempo prolongado de exploraci&oacute;n y la evaluaci&oacute;n anat&oacute;mica puede no ser exacta. Aunque la angiograf&iacute;a coronaria por RM ha demostrado su utilidad,<sup>75,76</sup> tiene algunas desventajas: el ser un estudio prolongado (aproximadamente 45 min a 1 hora); el estar contraindicado en pacientes con marcapasos, desfibriladores autom&aacute;ticos, pacientes claustrof&oacute;bicos; y el ser limitado en pacientes con algunas arritmias y baja resoluci&oacute;n espacial.<sup>66 </sup></font></p>     <p align="justify"><font face="verdana" size="2">Dentro de los m&eacute;todos no invasivos la TCEE y posteriormente la TCMD han demostrado ser una herramienta de gran utilidad en la evaluaci&oacute;n de este grupo de pacientes. <sup>66&#150;68,77,78</sup> Su capacidad multiplanar y alta resoluci&oacute;n espacial permiten evaluar de forma exacta (hasta en el 100% de casos)<sup>67,68</sup> y relativamente sencilla el origen y trayecto coronario, as&iacute; como sus relaciones anat&oacute;micas con los grandes vasos y c&aacute;maras card&iacute;acas incluso en aquellos pacientes con anomal&iacute;as complejas (por ej. f&iacute;stulas), en quienes las reconstrucciones volum&eacute;tricas son particularmente &uacute;tiles. Adem&aacute;s, permite reconocer si existe o no "acodamiento" de su origen y otras anomal&iacute;as asociadas.</font></p>     <p align="justify"><font face="verdana" size="2">Si bien, no corresponden a anomal&iacute;as coronarias en su origen, los puentes mioc&aacute;rdicos pueden visualizarse de manera relativamente sencilla por TCMD. Los puentes mioc&aacute;rdicos se definen como aquellos trayectos coronarios completamente rodeados de tejido mioc&aacute;rdico. La frecuencia de estos puentes es alta (aproximadamente 30% en la DA). Durante la contracci&oacute;n sist&oacute;lica, el segmento coronario afectado es comprimido y puede asociarse a alteraci&oacute;n del flujo coronario, isquemia y angina. La TC tambi&eacute;n es de utilidad en la evaluaci&oacute;n de aneurismas coronarios.<sup>4</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">De acuerdo a los lineamientos de la AHA, la angioTC de coronarias en la evaluaci&oacute;n de anomal&iacute;as coronarias se considera clase Ha con nivel de evidencia C<sup>38</sup> <i>(<a href="#t3">Tabla III</a>).</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Desventajas y limitaciones del m&eacute;todo</b></font></p>     <p align="justify"><font face="verdana" size="2">Aunque la TCMD es un estudio no invasivo, exacto, no&#150;operador dependiente y r&aacute;pido, la exposici&oacute;n a radiaci&oacute;n ionizante y el uso de materiales de contraste yodados pueden limitar su uso. Pese a que la cantidad de medio de contraste es similar a la administrada durante una angiograf&iacute;a coronaria convencional (60&#150;70 mL), con la excepci&oacute;n de los protocolos de injertos coronarios, los principales efectos adversos son la nefrotoxicidad y las reacciones al&eacute;rgicas. Las contraindicaciones absolutas incluyen falla renal (creatinina &gt; 1.5 mg/dL) y reacciones al&eacute;rgicas graves.</font></p>     <p align="justify"><font face="verdana" size="2">La radiaci&oacute;n recibida es de alrededor de 10&#150;15 mSv. Aunque los riesgos a largo plazo asociados a este nivel de exposici&oacute;n son relativamente bajos, persiste la preocupaci&oacute;n en repetir el estudio en j&oacute;venes. Adem&aacute;s, este nivel de radiaci&oacute;n es equivalente a la recibida durante pruebas de estr&eacute;s por medicina nuclear; y en la actualidad existen esquemas de protecci&oacute;n y modulaci&oacute;n de la corriente que han demostrado reducci&oacute;n de la radiaci&oacute;n aproximadamente en 50%, as&iacute; como protocolos de bajo amperaje/voltaje en la adquisici&oacute;n del Score de Calcio. Otra limitaci&oacute;n importante del m&eacute;todo es el n&uacute;mero de segmentos no valorables debido a artificios por movimiento y secundarios a placas calcificadas. El primer grupo de artificios se puede evitar con una apropiada preparaci&oacute;n del paciente y con el advenimiento de tecnolog&iacute;a m&aacute;s r&aacute;pida (256 detectores o aparatos duales). Sin embargo, la presencia de placas calcificadas es un factor no modificable y causa principal de resultados falsos positivos en el diagn&oacute;stico de estenosis significativa. De hecho, debido a que la prevalencia y la gravedad de las calcificaciones se incrementan con la edad, es probable que la exactitud del m&eacute;todo disminuya al avanzar la edad del paciente. Cabe recordar, que en la pr&aacute;ctica cl&iacute;nica cotidiana, se realiza un estudio simple con baja radiaci&oacute;n para el c&aacute;lculo del Score de Calcio con el objeto de identificar aquellos pacientes con calcificaci&oacute;n extensa (&gt; 1.000 UA), en quienes el procedimiento contrastado puede no ser de utilidad. </font></p>     <p align="justify"><font face="verdana" size="2">Otras desventajas son la disponibilidad del m&eacute;todo, as&iacute; como las inherentes a todos los equipos de tomograf&iacute;a, como lo es por ejemplo que el paciente debe de ser transportado a la sala de tomograf&iacute;a. No obstante, hoy d&iacute;a es mayor el n&uacute;mero de centros hospitalarios que cuentan con salas de tomograf&iacute;a en las unidades de urgencia. La frecuencia card&iacute;aca &oacute;ptima en equipos tanto de 16 como de 64 detectores, oscila alrededor de 65 latidos por minuto (lpm) o menos y con un ritmo regular, por lo que en aquellos pacientes arr&iacute;tmicos, inestables o "taquic&aacute;rdicos" (FC &gt; 70 lpm), las im&aacute;genes obtenidas pueden no ser de suficiente calidad diagn&oacute;stica debido a la falta de mayor resoluci&oacute;n temporal. Si bien existen algoritmos de reconstrucci&oacute;n que mejoran la resoluci&oacute;n temporal, equipos con mayor velocidad de giro del gantry o los sistemas duales (con resoluci&oacute;n temporal cercana a los 100 ms) probablemente permitir&aacute;n la exploraci&oacute;n m&aacute;s eficiente de este grupo de pacientes. </font></p>     <p align="justify"><font face="verdana" size="2">Pese a la excelente resoluci&oacute;n espacial de los equipos disponibles en la actualidad, la evaluaci&oacute;n del grado de estenosis en los vasos distales y &lt; 1.5&#150;2 mm contin&uacute;a limitada.<sup>27,35</sup> La resoluci&oacute;n espacial de la angiograf&iacute;a invasiva es superior (0.2 mm) y dado que la informaci&oacute;n obtenida es tridimensional (voxel), la resoluci&oacute;n angiogr&aacute;fica en 3 dimensiones es aproximadamente 8 veces mejor en la prueba considerada hasta hoy est&aacute;ndar de oro.</font></p>     <p align="justify"><font face="verdana" size="2">A pesar de que las indicaciones del m&eacute;todo han aumentado, con la informaci&oacute;n disponible ahora no est&aacute; suficientemente claro &iquest;c&oacute;mo la angio&#150;TC coronaria debe integrarse a la pr&aacute;ctica diaria?, o &iquest;s&iacute; podr&iacute;a ser empleada como una prueba de escrutinio en pacientes asintom&aacute;ticos en riesgo?, o &iquest;s&iacute; debe la angioTC coronaria ser la primera prueba en la evaluaci&oacute;n de pacientes con dolor tor&aacute;cico o como un complemento en pacientes con pruebas de estr&eacute;s no concluyentes? Estudios futuros nos permitir&aacute;n conocer la respuesta a &eacute;stas y otras interrogantes. Est&aacute; claramente establecido que la informaci&oacute;n pronostica derivada del an&aacute;lisis lip&iacute;dico, electrocardiogr&aacute;fico, estudios de perfusi&oacute;n mioc&aacute;rdica y estr&eacute;s por ecocardiograf&iacute;a son independientes a los resultados angiogr&aacute;ficos. Por lo tanto, la TCMD no podr&aacute; eliminar de manera absoluta la necesidad de esos estudios. Sin embargo, este m&eacute;todo surge como una nueva herramienta complementaria en la evaluaci&oacute;n de aterosclerosis coronaria.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los primeros a&ntilde;os de este nuevo milenio muestran un continuo e impresionante desarrollo de la TC y sus aplicaciones. La velocidad con la que aparece nueva tecnolog&iacute;a no deja de sorprender; pero acaso la Ley de Moore, quien predijo que cada 18 meses se duplica la capacidad de las computadoras &iquest;seguir&aacute; aplicable a la TC? Mientras tanto, los objetivos futuros e inmediatos de las casas comerciales ser&aacute;n dos: 1) incrementar la resoluci&oacute;n temporal de los equipos para disminuir a&uacute;n m&aacute;s la presencia de artificios por movimiento y la radiaci&oacute;n efectiva del paciente, as&iacute; como permitir la exploraci&oacute;n de pacientes sin la necesidad de <i>&#946;</i>&#150;bloqueo; y, 2) mejorar la resoluci&oacute;n espacial con el fin de realizar un an&aacute;lisis cuantitativo del grado de estenosis, descartar estenosis intra&#150; stent, y que acoplado a sistemas h&iacute;bridos (PET&#150;TC) permitir&iacute;a la caracterizaci&oacute;n de la placa.</font></p>     <p align="justify"><font face="verdana" size="2">Los resultados publicados al momento son prometedores, sin embargo debe considerarse que son producto de centros hospitalarios experimentados y en poblaci&oacute;n seleccionada. Mientras tanto, el creciente entusiasmo generado por este innovador m&eacute;todo en la comunidad m&eacute;dica deber&aacute; estar acoplado a un entrenamiento adecuado y a m&eacute;todos de validaci&oacute;n y credencializaci&oacute;n apropiados.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. 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