<?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>2954-3835</journal-id>
<journal-title><![CDATA[Cardiovascular and metabolic science]]></journal-title>
<abbrev-journal-title><![CDATA[Cardiovasc. metab. sci]]></abbrev-journal-title>
<issn>2954-3835</issn>
<publisher>
<publisher-name><![CDATA[Asociación Nacional de Cardiólogos de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2954-38352023000100016</article-id>
<article-id pub-id-type="doi">10.35366/110248</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Congenital absence of the right coronary artery with chronic total occlusion of the left coronary artery: a rare clinical situation]]></article-title>
<article-title xml:lang="es"><![CDATA[Ausencia congénita de la arteria coronaria derecha con oclusión total crónica de la arteria coronaria izquierda: un escenario clínico raro]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alanís-Naranjo]]></surname>
<given-names><![CDATA[José Martín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granados-Casas]]></surname>
<given-names><![CDATA[Óscar Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional 1o de Octubre ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Hospital Regional 1o de Octubre ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2023</year>
</pub-date>
<volume>34</volume>
<numero>1</numero>
<fpage>16</fpage>
<lpage>20</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2954-38352023000100016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2954-38352023000100016&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2954-38352023000100016&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: In the literature, few cases of absence of the coronary artery have been reported. In addition, the absence of the right coronary artery (RCA) with chronic total occlusion (CTO) of the left coronary artery is uncommon. We present the case of a Mexican patient with a history of exercise-induced chest pain in which a congenital absence of RCA with CTO was confirmed by coronary angiography. The patient was discharged symptom-free and remained so after conservative treatment. The absence of coronary arteries results from abnormal embryonic development, with various clinical manifestations; most patients show symptoms of myocardial ischemia. This case illustrates the importance of coronary angiography for diagnosis, which is considered the gold standard. However, there are no standardized treatment guidelines; conservative or revascularization therapy may be used to treat the condition. Due to its extremely low incidence, it is challenging to determine the prognosis of this coronary anomaly.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En la literatura se han reportado pocos casos de ausencia de la arteria coronaria. Además, es infrecuente la ausencia de la arteria coronaria derecha (CD) con oclusión total crónica (OTC) de la arteria coronaria izquierda. Presentamos el caso de un paciente mexicano con antecedentes de dolor torácico inducido por el ejercicio, en quien se confirmó, mediante angiografía coronaria, una ausencia congénita de CD con OTC. El paciente fue dado de alta asintomático y permaneció así tras el tratamiento conservador. La ausencia de arterias coronarias resulta del desarrollo embrionario anormal, con diversas manifestaciones clínicas; la mayoría de los pacientes muestran síntomas de isquemia miocárdica. Este caso ilustra la importancia de la angiografía coronaria para el diagnóstico, que se considera el estándar de oro. Sin embargo, no existen pautas de tratamiento estandarizadas; se puede utilizar una terapia conservadora o de revascularización para tratar la afección. Debido a su incidencia extremadamente baja, es difícil determinar el pronóstico de esta anomalía coronaria.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[absence of the right coronary artery]]></kwd>
<kwd lng="en"><![CDATA[chronic total occlusion]]></kwd>
<kwd lng="en"><![CDATA[coronary angiography]]></kwd>
<kwd lng="es"><![CDATA[ausencia de arteria coronaria derecha]]></kwd>
<kwd lng="es"><![CDATA[oclusión total crónica]]></kwd>
<kwd lng="es"><![CDATA[angiografía coronaria]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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