<?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>2078-7170</journal-id>
<journal-title><![CDATA[CorSalud]]></journal-title>
<abbrev-journal-title><![CDATA[CorSalud]]></abbrev-journal-title>
<issn>2078-7170</issn>
<publisher>
<publisher-name><![CDATA[Cardiocentro Ernesto Che Guevara]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2078-71702019000300189</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Terapia de resincronización cardíaca: Índice del QRS como predictor de respuesta]]></article-title>
<article-title xml:lang="en"><![CDATA[Cardiac resynchronization therapy: QRS index as a response predictor]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez López]]></surname>
<given-names><![CDATA[Frank]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castañeda Chirino]]></surname>
<given-names><![CDATA[Osmín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Falcón Rodríguez]]></surname>
<given-names><![CDATA[Roylán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro Hevia]]></surname>
<given-names><![CDATA[Jesús A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dorantes Sánchez]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz Cardentey]]></surname>
<given-names><![CDATA[Marleny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mengana Betancourt]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez López]]></surname>
<given-names><![CDATA[Alain]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Zayas Galguera]]></surname>
<given-names><![CDATA[Joanna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiñones Milián]]></surname>
<given-names><![CDATA[Inti R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera Ortega]]></surname>
<given-names><![CDATA[Michel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de la Vega Valcárcel]]></surname>
<given-names><![CDATA[Katherine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Cardiología y Cirugía Cardiovascular (ICCCV) Departamento de Arritmia y Estimulación Cardíaca ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Hermanos Ameijeiras (HHA) Departamento de Arritmia y Estimulación Cardíaca ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Investigaciones Médico Quirúrgicas (CIMEQ) Servicio de Cardiología ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Hospital General Calixto García Servicio de Cardiología ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Cardiocentro Pediátrico William Soler Departamento de Arritmia y Estimulación Cardíaca ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>189</fpage>
<lpage>195</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2078-71702019000300189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2078-71702019000300189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2078-71702019000300189&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  La terapia de resincronización cardíaca (TRC) es indicación en la insuficiencia cardíaca con QRS ancho y disminución grave de la fracción de eyección del ventrículo izquierdo.  Objetivos:  Definir los predictores de respuesta favorable a la TRC.  Método:  Se realizó un estudio observacional, descriptivo, retrospectivo, para evaluar el índice del QRS (diferencia entre anchura del QRS antes y después del implante, dividido entre su valor antes del implante, multiplicado por 100) como predictor de respuesta favorable a la TRC. Se realizaron electrocardiogramas antes del procedimiento, a los 6 y a los 12 meses del implante. Las mediciones se hicieron por dos observadores independientes, la primera digital en el monitor del salón de operaciones y el resto manual.  Resultados:  Se incluyeron 91 pacientes (edad media 61,2 años, 76% hombres), QRS mayor de 120 ms y fracción de eyección menor de 35%. Se obtuvo respuesta favorable en un 59%. No hubo diferencias significativas pre-implante en la duración del QRS entre respondedores y no respondedores (151,3 ms vs 151,34 ms, p=0,98), pero sí post-implante (100 vs 115 ms, p&lt;0,0001), así como en el porcentaje de disminución del QRS (33,2% vs 24,3%, p&lt;0,0001). La curva ROC mostró que un valor de corte del índice de QRS del 30% fue sensible (62%) y específico (75%), para predecir respuesta favorable.  Conclusiones:  La disminución de la anchura del QRS luego del implante de la TRC se relaciona con una respuesta favorable a la misma.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction:  Cardiac resynchronization therapy (CRT) is an indication in heart failure with wide QRS and severely reduced left ventricular ejection fraction.  Objectives:  To define the response predictors favorable to CRT.  Method: An observational, descriptive, retrospective study was conducted to evaluate the QRS index (difference between the QRS width before and after implantation, divided by its value before implantation, multiplied by 100) as a predictor of favorable response to CRT. Electrocardiograms were performed before the procedure, at 6 and 12 months after implantation. The measurements were made by two independent observers, the first digital on the operating room monitor and the rest manual.  Results:  A total of 91 patients (mean age 61.2 years, 76% men) were included, with QRS wider than 120 ms and ejection fraction less than 35%. A favorable response was obtained in 59%. There were no significant pre-implant differences in the QRS duration between responders and non-responders (151.3 ms vs. 151.34 ms, p=0.98), but there were differences post-implant (100 vs. 115 ms, p&lt;0.0001), as well as in the QRS percentage of decrease (33.2% vs. 24.3%, p&lt;0.0001). The ROC curve showed that a cut-off value of the QRS index of 30% was sensitive (62%) and specific (75%) in order to predict a favorable response.  Conclusions:  The decrease in the QRS width after the CRT implant is related to a favorable response to it.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Insuficiencia cardíaca]]></kwd>
<kwd lng="es"><![CDATA[Terapia de resincronización cardíaca]]></kwd>
<kwd lng="es"><![CDATA[Electrocardiografía]]></kwd>
<kwd lng="es"><![CDATA[Índice de QRS]]></kwd>
<kwd lng="es"><![CDATA[Cuba]]></kwd>
<kwd lng="en"><![CDATA[Heart failure]]></kwd>
<kwd lng="en"><![CDATA[Cardiac resynchronization therapy]]></kwd>
<kwd lng="en"><![CDATA[Electrocardiography]]></kwd>
<kwd lng="en"><![CDATA[QRS index]]></kwd>
<kwd lng="en"><![CDATA[Cuba]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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