<?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>S1665-50442021000500173</article-id>
<article-id pub-id-type="doi">10.24875/rmn.21000024</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Very-early Guillain-Barré syndrome: Clinical characteristics, electrophysiological findings, and short-term functional outcome]]></article-title>
<article-title xml:lang="es"><![CDATA[Síndrome de Guillain-Barré muy temprano: características clínicas, hallazgos electrofisiológicos y resultado funcional a corto plazo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Hernández]]></surname>
<given-names><![CDATA[Juan C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[May-Mas]]></surname>
<given-names><![CDATA[Raúl N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galnares-Olalde]]></surname>
<given-names><![CDATA[Javier A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bazán-Rodríguez]]></surname>
<given-names><![CDATA[Lisette]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saráchaga]]></surname>
<given-names><![CDATA[Adib J. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Jiménez]]></surname>
<given-names><![CDATA[Eunice]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Burgos-Centeno]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Manríquez]]></surname>
<given-names><![CDATA[Elizabeth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Cañas]]></surname>
<given-names><![CDATA[Edwin S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Department of Neuromuscular Diseases ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Neurología y Neurocirugía Department of Neurophysiology ]]></institution>
<addr-line><![CDATA[Mexico City ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2021</year>
</pub-date>
<volume>22</volume>
<numero>5</numero>
<fpage>173</fpage>
<lpage>179</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-50442021000500173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-50442021000500173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-50442021000500173&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Guillain-Barré syndrome (GBS) patients who present very early (&lt; 4 days) to health-care services generally have severe clinical forms due to rapid progression. Little information exists on the clinical and short-term functional prognosis in patients with very-early GBS (VEGBS).  Methods: A prospective cohort study was conducted. We performed Kaplan–Meier survival analysis to observe the recovery of independent gait between groups, where a log-rank value &lt; 0.05 was considered significant. All statistical analyzes were performed using SPSS version 22.  Results: Ninety-nine patients were included in the study. Mean age was 46.7 ± 16.7 years, 61.9% were male. Regarding nerve conduction studies, the most frequent electrophysiological variants in the very early-onset GBS group were axonal (38.7%). Twenty-three percent were classified as equivocal. In the GBS group &gt; 4 days, the most frequent electrophysiological variant was acute inflammatory demyelinating polyneuropathy (52.1%).  Conclusion: Patients with VEGBS do not present different clinical characteristics, nor severity or poor short-term outcome in our population compared to different GBS presentations. Only mechanical ventilation requirement and distal compound muscle action potential reduction are associated with poor outcome in this subset of patients.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Los pacientes con síndrome de Guillain Barré (SGB) que se presentan muy temprano (menos de 4 días) a los servicios de salud generalmente tienen formas clínicas graves debido a la rápida progresión. Existe poca información sobre el pronóstico clínico y funcional a corto plazo en pacientes con presentación ultra temprana.  Métodos: Se realizó un estudio de cohorte prospectivo. Realizamos un análisis de supervivencia de Kaplan-Meier para observar la recuperación de la marcha independiente entre los grupos, donde un valor de log-rank &lt; 0.05 se consideró significativo. Todos los análisis estadísticos se realizaron con SPSS versión 22.  Resultados: Se incluyeron 99 pacientes. La media de edad fue de 46.7 ± 16.7 años, el 61.9% eran varones. En cuanto a los estudios de conducción nerviosa, las variantes electrofisiológicas más frecuentes en el grupo de SGB de inicio muy precoz fueron axonales (38.7%). El 23% se clasificó como equívoco. En el grupo de SGB &gt; 4 días, la variante electrofisiológica más frecuente fue AIDP (52.1%).  Conclusión: Los pacientes con presentación ultratemprana no presentan características clínicas diferentes, ni gravedad ni mala evolución a corto plazo en nuestra población en comparación con diferentes presentaciones de SGB. Solo el requerimiento de ventilación mecánica y la reducción de la CMAP distal se asocian con un resultado deficiente en este subconjunto de pacientes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Guillain-Barré]]></kwd>
<kwd lng="en"><![CDATA[syndrome]]></kwd>
<kwd lng="en"><![CDATA[Very early]]></kwd>
<kwd lng="en"><![CDATA[Neuropathy]]></kwd>
<kwd lng="en"><![CDATA[AIDP]]></kwd>
<kwd lng="en"><![CDATA[AMAN]]></kwd>
<kwd lng="es"><![CDATA[Síndrome de Guillain-Barré]]></kwd>
<kwd lng="es"><![CDATA[syndrome]]></kwd>
<kwd lng="es"><![CDATA[Muy temprano]]></kwd>
<kwd lng="es"><![CDATA[Neuropatía]]></kwd>
<kwd lng="es"><![CDATA[PDIA]]></kwd>
<kwd lng="es"><![CDATA[NAMA]]></kwd>
</kwd-group>
</article-meta>
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