<?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>S2954-38352021000400197</article-id>
<article-id pub-id-type="doi">10.35366/102771</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The U wave: an ignored wave filled with information]]></article-title>
<article-title xml:lang="es"><![CDATA[Onda U: una onda olvidada llena de información]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duque-González]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaviria-Aguilar]]></surname>
<given-names><![CDATA[Maria C]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopera-Mejía]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duque-Ramírez]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad CES  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,CES Cardiología  ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad CES CES Cardiología ]]></institution>
<addr-line><![CDATA[Medellín Antioquia]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>32</volume>
<numero>4</numero>
<fpage>197</fpage>
<lpage>205</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2954-38352021000400197&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2954-38352021000400197&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2954-38352021000400197&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The U wave was first described over more than 100 years. However, numerous hypothesis about its origin and clinical significance still exist. It corresponds to the sixth wave of the electrocardiogram (ECG), and its visibility depends, among others, on the heart rate, but it may be absent in 50-75% of cases. Its origin is a cause of debate; there are four crucial hypotheses about its genesis: 1) repolarization of purkinje fibers, 2) repolarization of papillary muscles, 3) M cells theory, and 4) mechanoelectrical theory. Variants of the U wave are prominent and inverted. The inverted U wave is associated with hypertension, coronary heart disease or valvular disease. The prominent U wave is related to bradycardia, hypokalemia, hypothermia, long QT syndrome or with the use of some medication like class Ia and III antiarrhythmics.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La onda U se describió por primera vez hace más de 100 años. Sin embargo, aún existen numerosas hipótesis sobre su origen e importancia clínica. Corresponde a la sexta onda del Electrocardiograma (ECG), su visibilidad depende, entre otras cosas, de la frecuencia cardíaca, pero puede estar ausente en el 50-75% de los casos. Su origen es motivo de debate; existen cuatro hipótesis cruciales sobre su génesis: 1) repolarización de las fibras de Purkinje, 2) repolarización de los músculos papilares, 3) teoría de las células M, y 4) teoría mecanoeléctrica. Las variantes de la onda U son: prominente e invertida. La onda U invertida se asocia con hipertensión, enfermedad coronaria o enfermedad valvular. La onda U prominente está relacionada con bradicardia, hipocalemia, hipotermia, síndrome de QT largo o con el uso de algunos medicamentos como los antiarrítmicos de clase Ia y III.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Electrocardiogram]]></kwd>
<kwd lng="en"><![CDATA[U-wave]]></kwd>
<kwd lng="en"><![CDATA[inverted]]></kwd>
<kwd lng="en"><![CDATA[prominent]]></kwd>
<kwd lng="en"><![CDATA[ischemia]]></kwd>
<kwd lng="es"><![CDATA[Eletrocardiograma]]></kwd>
<kwd lng="es"><![CDATA[onda U]]></kwd>
<kwd lng="es"><![CDATA[invertido]]></kwd>
<kwd lng="es"><![CDATA[prominente]]></kwd>
<kwd lng="es"><![CDATA[isquemia]]></kwd>
</kwd-group>
</article-meta>
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