<?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>1665-5044</journal-id>
<journal-title><![CDATA[Revista mexicana de neurociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. neurocienc.]]></abbrev-journal-title>
<issn>1665-5044</issn>
<publisher>
<publisher-name><![CDATA[Academia Mexicana de Neurología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-50442023000600174</article-id>
<article-id pub-id-type="doi">10.24875/rmn.23000031</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Correlation between dual-phase CTA-SI ASPECTS and automated CT perfusion imaging in patients with acute ischemic stroke beyond the 6-hour window]]></article-title>
<article-title xml:lang="es"><![CDATA[Correlación entre CTA-SI ASPECTS de doble fase y perfusión por TC con procesamiento automatizado en pacientes con ictus isquémico agudo más allá de la ventana de 6 horas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gallardo]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lavados]]></surname>
<given-names><![CDATA[Pablo M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cox]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barra]]></surname>
<given-names><![CDATA[Camila de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cavada]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olavarria]]></surname>
<given-names><![CDATA[Verónica V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Digital Unidad de TeleACV ]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Carlos Van Buren Unidad de Imagenología Compleja ]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Facultad de Medicina Clínica Alemana Universidad del Desarrollo Clínica Alemana de Santiago Departamento de Neurología y Psiquiatría]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Clínica Alemana de Santiago Departamento Científico Docente Unidad de Investigación y Ensayos Clínicos]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Valparaíso Centro de Neurología Traslacional ]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Facultad de Medicina Clínica Alemana Universidad del Desarrollo Clínica Alemana de Santiago Departamento de Imagenología]]></institution>
<addr-line><![CDATA[Santiago ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>24</volume>
<numero>6</numero>
<fpage>174</fpage>
<lpage>178</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-50442023000600174&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-50442023000600174&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-50442023000600174&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background/Objective: There is controversy regarding the need to use advanced imaging to select candidates for thrombectomy in late window acute ischemic stroke (AIS). Hypoattenuation on CT angiography source images (CTA-SI) in arterial phase has been shown to be more sensitive than Alberta Stroke Program Early CT Score (ASPECTS) of brain parenchyma to determine tissue at risk of ischemia. Our hypothesis is that the addition of a second acquisition at 35-50 seconds could complement the assessment of hypoperfused tissue that fails to receive flow through pial vessels.  Methods: Patients with large vessel occlusion and 6-24 hours from symptom onset, admitted between August 2019 and July 2023, were evaluated with dual-phase CT angiography (CTA) and CT-Perfusion. A vascular neurologist estimated CTA-SI ASPECTS in both phases at the time of data entry into the RECCA registry. In contrast, the post-processing of CT-Perfusion images was performed in an automated way through RAPID© software. The association between automated CT-perfusion values and dual-phase CTA-SI ASPECTS was assessed through a correlation coefficient.  Results: Pearson&#8217;s coefficient demonstrated a high correlation between ischemic core volume and delayed phase CTA (CTA-DP) ASPECTS with an inverse association of &#8722;0.93 and between Tmax &#8805; 6 sec volume and arterial phase CTA (CTA-AP) ASPECTS with a value of &#8722;0.88.  Conclusions: CTA-derived source images (CTA-SI) in two phases may be useful in the selection of patients with AIS presenting beyond the 6-hour window.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción/Objetivo: La recomendación actual es realizar el tamizaje de pacientes con ataque cerebrovascular ACV y oclusión de grades vasos LVO (por sus siglas en ingles) potencialmente candidatos a trombectomía mecánica en ventana extendida a través de un estudio de TC perfusión con post procesamiento automatizado. El acceso a TC perfusión no está ampliamente disponible en el mundo, por lo que existe controversia en relación a que sea una herramienta imprescindible.  Métodos: Este es un estudio prospectivo de un registro retrospectivo unicéntrico con pacientes con ACV de circulación anterior, LVO y un tiempo entre 6-24 horas desde el inicio de los síntomas hasta la realización del estudio imagenológico. A todos los pacientes se les realizó un AngioTC en 2 fases, con evaluación de sus imágenes fuentes CTA-SI (por sus siglas en ingles) y un estudio de perfusión con post procesamiento por software RAPID.  Resultados: El coeficiente de Pearson&#8217;s mostró una alta correlación entre el volumen de núcleo isquémico medido por FSC &lt; 30% y el valor CTA-SI ASPECTS en fase tardía, con una asociación inversa de &#8722;0.93.  Conclusión: La interpretación de CTA-SI ASPECTS en 2 fases entrega información congruentes con los resultados automatizados de los mapas de TC perfusión.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dual-phase computed tomography angiography]]></kwd>
<kwd lng="en"><![CDATA[CT-Perfusion]]></kwd>
<kwd lng="en"><![CDATA[Late window acute ischemic stroke]]></kwd>
<kwd lng="es"><![CDATA[Trombectomía]]></kwd>
<kwd lng="es"><![CDATA[ASPECTS]]></kwd>
<kwd lng="es"><![CDATA[Endovascular]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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