<?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>1561-3194</journal-id>
<journal-title><![CDATA[Revista de Ciencias Médicas de Pinar del Río]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Ciencias Médicas]]></abbrev-journal-title>
<issn>1561-3194</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1561-31942023000500007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cronobiología del infarto agudo de miocardio]]></article-title>
<article-title xml:lang="en"><![CDATA[Chronobiology of Acute Myocardial Infarction]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[del Toro-Cámbara]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pozo-Pozo]]></surname>
<given-names><![CDATA[Dinorah]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Fernández]]></surname>
<given-names><![CDATA[Marla]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Castro]]></surname>
<given-names><![CDATA[Katiuska]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Catalá-Rivero]]></surname>
<given-names><![CDATA[Yinet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Catalá-Díaz]]></surname>
<given-names><![CDATA[Yusleiby]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Facultad de Ciencias Médicas Dr. Ernesto Guevara de la Serna.  ]]></institution>
<addr-line><![CDATA[Pinar del Río ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<volume>27</volume>
<numero>4</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1561-31942023000500007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1561-31942023000500007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1561-31942023000500007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  el conocimiento de la cronobiología cardiovascular supone una mejor aproximación para el diagnóstico y tratamiento del infarto agudo de miocardio.  Objetivo:  describir el comportamiento cronobiológico del infarto agudo de miocardio y sus diferencias teniendo en cuenta el sexo de los pacientes.  Métodos:  estudio observacional, analítico y transversal con pacientes atendidos en el Hospital "Abel Santamaría", en el período enero a diciembre de 2021. Fueron incluidos de manera intencional 260 pacientes con diagnóstico de esta enfermedad. Las variables colectadas fueron: sexo, factores de riesgo cardiovasculares, horario del día de aparición de los síntomas y mes de ocurrencia del evento.  Resultados:  la hipertensión arterial (75,8 %) resultó el factor de riesgo más prevalente. El horario de mayor frecuencia de presentación de los síntomas cardiovasculares fue el de 6:00 a 8:59 am (44,79 %). Los meses de mayor frecuencia resultaron mayo y diciembre (10,44 %). El sexo determinó diferencias estadísticamente significativas (p&lt;0.05) en los horarios de ocurrencia de los síntomas. Para las féminas el horario de 12:00 a 2:59 am mostró una elevada frecuencia en comparación con los hombres (10,5 % vs 0,6 %). De 12:00 a 2:59 pm se presentan escasos eventos en mujeres en comparación con los ocurridos en hombres (2,3 % vs 9,8 %).  Conclusiones:  El Infarto agudo de miocardio mostró mayor frecuencia de inicio de síntomas en horarios de la mañana y en mayo y diciembre en la serie estudiada. El sexo determinó diferencias en dicho comportamiento cronobiológico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: knowledge of cardiovascular chronobiology is a better approach to the diagnosis and treatment of acute myocardial infarction.  Objective:  to describe the chronobiological behaviour of acute myocardial infarction and its differences taking into account the sex of the patients.  Methods: observational, analytical and cross-sectional study of patients treated at the "Abel Santamaría" Hospital, from January to December 2021. A total of 260 patients with a diagnosis of this disease were included intentionally. The variables collected were: sex, cardiovascular risk factors, time of day of onset of symptoms and month of occurrence of the event.  Results: hypertension (75,8 %) was the most prevalent risk factor. The most frequent time of day for the presentation of cardiovascular symptoms was between 6:00 and 8:59 am (44,79 %). The months with the highest frequency were May and December (10,44 %). Sex determined statistically significant differences (p&lt;0.05) in the times of symptom occurrence. For females, the time from 12:00 to 2:59 am showed a higher frequency compared to males (10,5 % vs. 0,6 %). From 12:00 to 2:59 pm few events occur in females compared to those occurring in males (2,3 % vs 9,8 %).  Conclusions:  Acute myocardial infarction showed a higher frequency of symptom onset in the morning hours and in May and December in the series studied. Sex determined differences in this chronobiological behaviour.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[INFARTO AGUDO DEL MIOCARDIO]]></kwd>
<kwd lng="es"><![CDATA[CRONOBIOLOGÍA.]]></kwd>
<kwd lng="en"><![CDATA[MYOCARDIAL INFARCTION]]></kwd>
<kwd lng="en"><![CDATA[CHRONOBIOLOGY.]]></kwd>
</kwd-group>
</article-meta>
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