<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402016000300214</article-id>
<article-id pub-id-type="doi">10.1016/j.acmx.2016.04.008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Prevalencia de fibrilación auricular y factores predictores de su aparición en pacientes portadores de marcapasos bicamerales]]></article-title>
<article-title xml:lang="en"><![CDATA[Prevalence of atrial fibrillation and predictors of its occurrence in patients with dual-chamber pacemakers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[Germán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maid]]></surname>
<given-names><![CDATA[Gustavo Fabián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias]]></surname>
<given-names><![CDATA[Aníbal Martín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado]]></surname>
<given-names><![CDATA[Sebastián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pizarro]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Belziti]]></surname>
<given-names><![CDATA[Cesar Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Italiano de Buenos Aires  ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>86</volume>
<numero>3</numero>
<fpage>214</fpage>
<lpage>220</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402016000300214&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402016000300214&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402016000300214&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivos Evaluar la prevalencia de fibrilación auricular (FA) en pacientes portadores de marcapasos bicamerales (MB), las variables asociadas a su aparición y los cambios de conducta clínica que este hallazgo ha generado.  Métodos Se incluyó prospectivamente a 500 pacientes ambulatorios portadores de MB. Se realizó interrogatorio sobre el MB. Se contactó a los médicos de cabecera ante la aparición de FA y luego se determinó si esta información resultaba en cambios de conducta terapéutica.  Resultados La media de edad de la población fue de 77 años, con un 51% de hombres. Se detectó FA en un 13.2% de los pacientes. Esto generó modificaciones en el tratamiento en un 64.7% de ellos. En el modelo de regresión logística, a través de un análisis multivariado, se asociaron a la aparición de FA las siguientes variables: hipertensión arterial (OR = 2.62; IC 95% 1.01-6.8; p &lt; 0.048), antecedente de FA (OR = 4.30; IC 95% 2.26-8.32; p &lt; 0.001), enfermedad del nodo sinusal como causa de implante (OR = 2.09; IC 95% 1.09-3.97; p &lt; 0.025) y la cantidad de series de extrasístoles supraventriculares detectadas (OR = 1.000033 por cada serie; IC 95% 0.000011-0.000055; p &lt; 0.003). Una cantidad de series de extrasístoles supraventriculares igual o mayor de 77 en un control de marcapasos presenta un área bajo la curva de 0.81 para la detección de FA.  Conclusión Se ha detectado una alta prevalencia de FA en pacientes portadores de MB. Este hallazgo condujo a importantes cambios en el tratamiento. Se han detectado 4 variables asociadas independientemente a la detección de FA.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objectives To assess the prevalence of atrial fibrillation (AF) in patients with dual-chamber pacemakers (DP), determine the variables associated with development of AF and evaluate the changes in AF's management by physicians.  Methods Five hundred patients with DP were prospectively included and interrogated. When AF was detected physicians in charge of the patient were warned. Changes in AF's management were evaluated.  Results Mean age of the study population was 77 years, with 51% of men. AF was detected in 13.2% of patients. These findings led treatment changes in 64.7%. The variables analyzed by logistic regression model which were associated with the occurrence of AF were: arterial hypertension (OR = 2.62; CI 95% 1.01-6.8; P &lt; .048), history of AF (OR = 4.30; CI 95% 2.26-8.32; P &lt; .001), sick sinus syndrome as cause of device implantation (OR = 2.09; CI 95% 1.09-3.97; P &lt; .025) and burden of supraventricular extrasystoles series(OR = 1.000033 per serie; CI 95% 0.000011-0.000055; P &lt; .003.).  Conclusion We have detected a high prevalence of AF in patients with DP. The diagnose of AF led to change in treatment. Four clinical variables increase the likelihood of developing this arrhythmia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dual-chamber pacemakers]]></kwd>
<kwd lng="en"><![CDATA[Argentina]]></kwd>
<kwd lng="en"><![CDATA[Atrial fibrillation]]></kwd>
<kwd lng="en"><![CDATA[Supraventricular extrasystoles]]></kwd>
<kwd lng="es"><![CDATA[Marcapasos bicamerales]]></kwd>
<kwd lng="es"><![CDATA[Argentina]]></kwd>
<kwd lng="es"><![CDATA[Fibrilación auricular]]></kwd>
<kwd lng="es"><![CDATA[Extrasístoles supraventriculares]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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<article-title xml:lang=""><![CDATA[Cryptogenic stroke and underlying atrial fibrillation]]></article-title>
<person-group person-group-type="author">
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<given-names><![CDATA[RS]]></given-names>
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<collab>CRYSTAL AF Investigators</collab>
<source><![CDATA[N Engl J Med]]></source>
<year>2014</year>
<volume>370</volume>
<page-range>2478-86</page-range></nlm-citation>
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