<?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>1812-9528</journal-id>
<journal-title><![CDATA[Memorias del Instituto de Investigaciones en Ciencias de la Salud]]></journal-title>
<abbrev-journal-title><![CDATA[Mem. Inst. Investig. Cienc. Salud]]></abbrev-journal-title>
<issn>1812-9528</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Investigaciones en Ciencias de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1812-95282021000300096</article-id>
<article-id pub-id-type="doi">10.18004/mem.iics/1812-9528/2021.019.03.96</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Rol de la morfología y dispersión de la onda P en la predicción de fibrilación auricular]]></article-title>
<article-title xml:lang="en"><![CDATA[Role of P wave morphology and dispersion in predicting atrial fibrillation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Centurión]]></surname>
<given-names><![CDATA[Osmar Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sequeira]]></surname>
<given-names><![CDATA[Orlando R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Scavenius]]></surname>
<given-names><![CDATA[Karina E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miño]]></surname>
<given-names><![CDATA[Luis M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Laura B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torales]]></surname>
<given-names><![CDATA[Judith M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alderete]]></surname>
<given-names><![CDATA[José F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Candia]]></surname>
<given-names><![CDATA[José C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[Christian O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meza]]></surname>
<given-names><![CDATA[Alfredo J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Sanatorio Metropolitano Departamento de Investigación en Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Fernando de la Mora ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Asunción Hospital de Clínicas División de Medicina Cardiovascular]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</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>19</volume>
<numero>3</numero>
<fpage>96</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S1812-95282021000300096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S1812-95282021000300096&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S1812-95282021000300096&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las características anisotrópicas ocasionadas por un miocardio auricular patológico pueden jugar un papel importante en la creación de circuitos de reentrada al causar propagación no homogénea y discontinua del impulso en el miocardio auricular. Este miocardio auricular alterado puede generar bloqueo unidireccional, retraso de la conducción y ritmos auriculares reentrantes. En estas condiciones la onda P del electrocardiograma (ECG) puede mostrar alteraciones que pueden asociarse con arritmias auriculares y fibrilación auricular (FA). La dispersión de la onda P (DP) se considera un marcador no invasivo del ECG para el remodelado auricular y es predictor sensible y específico del desarrollo de FA. Se ha demostrado que el aumento de la duración de la onda P y la DP reflejan la prolongación del tiempo de conducción auricular dentro de la aurícula derecha y entre ambas aurículas, y una propagación auricular no homogénea y discontinua de los impulsos sinusales. Un valor de corte de 40 ms de la DP demostró tener una sensibilidad del 83%, una especificidad del 85% y un valor predictivo positivo del 89% para la identificación de pacientes con antecedentes de FA paroxística aislada. Los pacientes con alteración de la morfología de la onda P y dispersión de la onda P en el ECG tienen una gran susceptibilidad a desarrollar FA porque poseen electrogramas endocárdicos auriculares anormalmente prolongados y fraccionados, una duración de onda P significativamente mayor, un tiempo de conducción intraauricular e interauricular significativamente más largo, y una mayor incidencia de inducción de fibrilación auricular sostenida.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The anisotropic characteristics caused by a pathological atrial myocardium can play an important role in the creation of reentry circuits by causing discontinuous and inhomogeneous impulse propagation in the atrial myocardium. This altered atrial myocardium can lead to unidirectional block, conduction delay, and reentrant atrial rhythms. Under these conditions, the P wave of the electrocardiogram (ECG) can demonstrate alterations that can be associated with atrial arrhythmias and atrial fibrillation (AF). The P-wave dispersion (PD) is considered a non-invasive ECG marker for atrial remodeling and is a sensitive and specific predictor of the development of AF. Increased P wave duration and PD have been shown to reflect prolonged atrial conduction time within the right atrium and between both atria, and discontinuous, inhomogeneous atrial propagation of sinus impulses. A cutoff value of 40 ms for PD was shown to have a sensitivity of 83%, a specificity of 85%, and a positive predictive value of 89% for the identification of patients with a history of isolated paroxysmal AF. Patients with abnormal P wave morphology and P wave dispersion on the ECG are highly susceptible to developing AF because they have abnormally prolonged and fractionated atrial endocardial electrograms, significantly longer P wave duration, and significantly longer intra-atrial and inter-atrial conduction time, and a higher incidence of sustained atrial fibrillation induction.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Dispersión de la onda P]]></kwd>
<kwd lng="es"><![CDATA[Fibrilación auricular]]></kwd>
<kwd lng="es"><![CDATA[Conducción interauricular]]></kwd>
<kwd lng="en"><![CDATA[P wave dispersion]]></kwd>
<kwd lng="en"><![CDATA[Atrial fibrillation]]></kwd>
<kwd lng="en"><![CDATA[interatrial conduction]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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