<?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>0253-570X</journal-id>
<journal-title><![CDATA[Revista de Salud Animal]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Salud Anim.]]></abbrev-journal-title>
<issn>0253-570X</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Sanidad Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0253-570X2019000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Morfología y polaridad del complejo QRS del electrocardiograma en el ganado bovino]]></article-title>
<article-title xml:lang="en"><![CDATA[Morphology and polarity of the QRS complex of the electrocardiogram in cattle]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pompa Núñez]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Agraria de La Habana  ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0253-570X2019000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0253-570X2019000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0253-570X2019000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El objetivo de esta investigación fue determinar la morfología y la polaridad del complejo QRS del electrocardiograma del bovino de la raza Holstein, en diferentes puntos de la superficie corporal, como referencia para el diagnóstico de alteraciones cardíacas. Los electrocardiogramas se efectuaron en 20 derivaciones, nueve bipolares y 11 monopolares; en total se observaron 1800 registros procedentes de 100 animales clínicamente sanos y pertenecientes a diferentes grupos etarios de uno y de otro sexo. El complejo QRS fue codificado de acuerdo a su morfología y se detectaron 22 formas diferentes, con mayor frecuencia de aparición de la onda R como único componente del complejo en todas las derivaciones. En las derivaciones bipolares estándares de extremidades se presentó la mayor diversidad en la polaridad del complejo QRS y en la morfología. Por el contrario, el número máximo de formas del complejo QRS en las bipolares de hombro y de base-ápice fue muy bajo, al igual que en las derivaciones monopolares V1H, V3H, V10 y V4. Se concluye que en las derivaciones en las que los electrodos miden diferencias de potenciales entre las regiones de la base y del ápice del corazón, o en las que el electrodo explorador se coloca en alguna de estas dos áreas, la polaridad de las ondas del complejo QRS es muy estable y la morfología varía muy poco, lo que las convierte en una referencia importante para detectar alteraciones del sistema de conducción del impulso eléctrico en el corazón del bovino.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The aim of this research was to determine the morphology and polarity of the QRS complex of the electrocardiogram in Holstein cattle, at different points of the body surface, as a reference for the diagnosis of cardiac alterations. Electrocardiograms were carried out in 20 derivations, nine bipolar and 11 monopolar. In total, 1800 records were observed from 100 clinically healthy animals and belonging to different age groups of both sexes. The QRS complex was coded according to its morphology. Twenty two different forms were detected, with greater appearance frequency of the R wave as the only component of the complex in all derivations. The greatest diversity in the polarity of the QRS complex and in morphology was presented in the standard bipolar derivations of extremities. On the contrary, the maximum number of the forms of the QRS complex in the shoulder and base-apex bipolar derivation was very low, as in the monopolar derivations V1H, V3H, V10 and V4. It is concluded that in the derivations in which the electrodes measure potential differences between the base-apex regions of the heart, or in which the scanning electrode is placed in one of these two areas, the polarity of the QRS complex waves is very stable and the morphology varies very little. This makes them an important reference to detect alterations of the electrical conduction system of the heart t in cattle.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[complejo QRS]]></kwd>
<kwd lng="es"><![CDATA[polaridad]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="es"><![CDATA[Holstein]]></kwd>
<kwd lng="en"><![CDATA[QRS complex]]></kwd>
<kwd lng="en"><![CDATA[polarity]]></kwd>
<kwd lng="en"><![CDATA[morfology]]></kwd>
<kwd lng="en"><![CDATA[Holstein]]></kwd>
</kwd-group>
</article-meta>
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