<?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>S1405-99402020000300274</article-id>
<article-id pub-id-type="doi">10.24875/acm.20000355</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio comparativo de la función cardíaca en dos poblaciones de América Latina mediante el ecocardiograma transtorácico: Atahualpa, Ecuador y Ciudad de México, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Comparative study of cardiac function between two populations in Latin America using the transthoracic echocardiogram: Atahualpa, Ecuador, and Mexico City, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Graullera]]></surname>
<given-names><![CDATA[Juan M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nader-Kawachi]]></surname>
<given-names><![CDATA[Juan A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crespo-Serge]]></surname>
<given-names><![CDATA[Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Del Brutto]]></surname>
<given-names><![CDATA[Óscar H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro Integral de Diagnóstico y Tratamiento Departamento de Ecocardiografía ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Médica Sur Unidad de Neurología y Neurocirugía Clínica de Enfermedad Cerebrovascular]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Espíritu Santo Escuela de Medicina ]]></institution>
<addr-line><![CDATA[Samborondón ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>90</volume>
<numero>3</numero>
<fpage>274</fpage>
<lpage>283</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402020000300274&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402020000300274&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402020000300274&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivo: Comprobar las diferencias morfológicas y funcionales del corazón en dos poblaciones latinoamericanas con distintas características raciales y condiciones de vida.  Métodos: Mediante el ecocardiograma transtorácico se obtuvieron datos de 206 personas: 103 del poblado de Atahualpa, Ecuador (nivel del mar, edad x&#772; 75 ± 4.2 años, 53 mujeres) y 103 habitantes de la Ciudad de México (altitud de 2,300 m, edad x&#772; 75 ± 4.2 años, 52 mujeres).  Resultados: Las diferencias significativas entre Atahualpa y la Ciudad de México fueron frecuencia cardíaca, 66 vs. 80; diámetro diastólico ventricular izquierdo, 40.8 vs. 42.7; grosor del tabique, 9.8 vs. 11.6; pared posterior, 10.2 vs. 11.8; volumen-latido en centímetros cúbicos, 53.0 vs. 46.6; volumen auricular Izquierdo, 25.8 vs. 33.6; presión sistólica de la arteria pulmonar, 27.1 vs. 42.0; gasto cardíaco, 3.1 vs. 4.8; cociente E/Ea, 6.4 vs. 9.2; área mitral, 3.4 vs. 3.0. El comparativo de la función diastólica entre Atahualpa y la Ciudad de México fue: tipo 0: 2 vs. 1; tipo 1: 96 vs. 81; tipo 2: 5 vs. 20; tipo 3: 0 vs. 1.  Conclusión: Las características ecocardiográficas que identifican los cambios adaptativos del corazón en Atahualpa coinciden con personas que viven a nivel del mar y con buena actividad física y en México con los habitantes de grandes altitudes y expuestos a contaminación ambiental. La función sistólica del ventrículo izquierdo fue similar en ambas poblaciones, lo que indica que los cambios adaptativos hacen posible que el corazón sea eficaz en diferentes circunstancias del ecosistema.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objective: To compare morphological and functional differences of the heart in two Latin American populations with different ethnicity and living conditions.  Methods: Using transthoracic echocardiogram we obtained data on 206 individuals: 103 from Atahualpa, Ecuador (living at sea level, mean age: 75 ± 4.2 years, 53 women) and 103 inhabitants from Mexico City (living at 2300 m above sea level, mean age: 75 ± 4.2 years, 52 women).  Results: Significant differences between Atahualpa and Mexico were: Heart rate 66 versus 80 x’, left ventricular diastolic diameter 40.8 versus 42.7, septum thickness 9.8 versus 11.6, posterior wall 10.2 versus 11.8, stroke volume cc 53.0 versus 46.6, left atrial volume 25. 8 versus 33.6, systolic pressure of the pulmonary artery 27.1 versus 42.0, cardiac output 3.1 versus 4.8, E/Ea ratio 6.4 versus 9.2, and mitral area 3.4 versus 3.0. Comparison of diastolic function between Atahualpa and Mexico was: Type 0; 2 versus 1. Type 1; 96 versus 81. Type 2; 5 versus 20 and Type 3; 0 versus 1.  Conclusion: Echocardiographic characteristics that identify adaptive changes of the heart in Atahualpa are coincident with people living at sea level and with good physical activity, and Mexico City, with inhabitants living at high altitudes and exposed to environmental pollution. The systolic function of the left ventricle was similar in both populations, indicating that adaptive changes allow the heart to be effective in different circumstances of the ecosystem.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ecocardiograma transesofágico]]></kwd>
<kwd lng="es"><![CDATA[Hipertensión pulmonar]]></kwd>
<kwd lng="es"><![CDATA[Hipoxemia]]></kwd>
<kwd lng="es"><![CDATA[América Latina]]></kwd>
<kwd lng="es"><![CDATA[Gran altitud]]></kwd>
<kwd lng="es"><![CDATA[Contaminación ambiental]]></kwd>
<kwd lng="en"><![CDATA[Transesophageal echocardiogram]]></kwd>
<kwd lng="en"><![CDATA[Pulmonary hypertension]]></kwd>
<kwd lng="en"><![CDATA[Hypoxemia]]></kwd>
<kwd lng="en"><![CDATA[Latin America]]></kwd>
<kwd lng="en"><![CDATA[High altitude]]></kwd>
<kwd lng="en"><![CDATA[Environmental pollution]]></kwd>
</kwd-group>
</article-meta>
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