<?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>S2954-38352022000300123</article-id>
<article-id pub-id-type="doi">10.35366/107626</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Persistent angina without persistent ST-segment elevation: do not forget a myocardial infarction with acute occlusion of a coronary artery]]></article-title>
<article-title xml:lang="es"><![CDATA[Angina persistente sin elevación persistente del segmento ST: que no se te olvide el infarto de miocardio con oclusión aguda de una arteria coronaria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldomà-Balasch]]></surname>
<given-names><![CDATA[Albina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Aguilar]]></surname>
<given-names><![CDATA[Pedro Kristian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zielonka]]></surname>
<given-names><![CDATA[Marta Zofia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Universitari Arnau de Vilanova IRB Lleida Servicio de Cardiología]]></institution>
<addr-line><![CDATA[Lleida ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>123</fpage>
<lpage>125</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2954-38352022000300123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2954-38352022000300123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2954-38352022000300123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Case report:  A 57-year-old man consulted for chest pain suggestive of angina. The electrocardiogram (ECG) showed a right bundle branch block (RBBB), not present in previous ECGs, with secondary abnormalities of repolarization without meeting the criteria for ischemia. Due to persistent angina despite treatment, an emergent coronary angiography was performed, which showed an acute thrombotic occlusion of the right coronary artery (RCA) with good collateral circulation (CC) from the left coronary tree, which did not present significant stenosis. After reperfusion, angina progressively disappeared, and RBBB resolved. The infarct size was smaller than expected, as well as the poor electrocardiographic expressiveness, due to the good heterocoronary CC that was observed in the infarcted territory.  Conclusion:  Myocardial infarction with acute occlusion of a coronary artery must be kept in mind in patients with persistent angina despite treatment, and the ECG does not show the typical abnormalities.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Caso clínico:  Paciente de 57 años que consultó por dolor torácico sugestivo de angina, con un electrocardiograma (ECG) que mostraba un bloqueo de rama derecha (BRD) no presente previamente, con las correspondientes alteraciones de la repolarización en contexto de bloqueo de rama sin cumplir criterios de isquemia. Por persistencia de angina a pesar del tratamiento se decidió realizar coronariografía emergente objetivando una oclusión trombótica aguda de la arteria coronaria derecha con buena circulación colateral (CC) heterocoronaria desde el árbol coronario izquierdo, el cual no presentaba lesiones significativas. Después de la revascularización, la angina desapareció progresivamente y se resolvió el BRD. Dada la buena CC heterocoronaria del territorio infartado, el tamaño del infarto fue menor de lo esperado y esto justificaría la escasa expresividad del ECG.  Conclusión:  El infarto de miocardio con oclusión aguda de una arteria coronaria debe tenerse en cuenta en pacientes con angina persistente a pesar del tratamiento y que el ECG no muestre las anomalías típicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[transmural acute myocardial infarction]]></kwd>
<kwd lng="en"><![CDATA[right bundle branch block]]></kwd>
<kwd lng="en"><![CDATA[repolarization abnormalities]]></kwd>
<kwd lng="en"><![CDATA[coronary collateral circulation]]></kwd>
<kwd lng="es"><![CDATA[infarto agudo de miocardio transmural]]></kwd>
<kwd lng="es"><![CDATA[bloqueo de rama derecha]]></kwd>
<kwd lng="es"><![CDATA[alteraciones de la repolarización]]></kwd>
<kwd lng="es"><![CDATA[circulación colateral coronaria]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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