<?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>2954-4122</journal-id>
<journal-title><![CDATA[Archivos de neurociencias (México)]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Neurocien. (Mex.)]]></abbrev-journal-title>
<issn>2954-4122</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Neurología y Neurocirugía "Manuel Velasco Suárez"]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2954-41222025000100048</article-id>
<article-id pub-id-type="doi">10.24875/anc.m24000021</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Mioclonía generalizada tras picadura de tarántula: reporte de un caso]]></article-title>
<article-title xml:lang="en"><![CDATA[Generalized myoclonus following a tarantula spider bite: a case report]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Garza]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acevedo-Castillo]]></surname>
<given-names><![CDATA[Carlos D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esparza-Hernández]]></surname>
<given-names><![CDATA[Claudia N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Echeverría-Vargas]]></surname>
<given-names><![CDATA[Juan A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martinez-Ramirez]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tecnológico de Monterrey Facultad de Medicina y Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[Monterrey N.L]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Christus Muguerza Hospital Sur Servicio de Neurología ]]></institution>
<addr-line><![CDATA[Monterrey N.L]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>30</volume>
<numero>1</numero>
<fpage>48</fpage>
<lpage>51</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2954-41222025000100048&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2954-41222025000100048&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2954-41222025000100048&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El mioclono es un trastorno de movimientos musculares involuntarios que generalmente se desencadena por lesiones neurológicas agudas. Presentamos el caso de una mujer de 41 años que experimentó mioclono generalizado después de ser picada por una araña relacionada con las tarántulas. Acompañando la picadura, presentó lesiones en la piel, dolor, picazón y fiebre. Aunque los análisis revelaron mioclono, no se encontraron otras anormalidades, sugiriendo la picadura de araña como la causa más probable. El tratamiento con clonazepam, trihexifenidilo y doxiciclina resultó en una mejoría rápida. Este caso desafía los paradigmas diagnósticos convencionales y destaca la importancia de considerar causas no tradicionales en casos difíciles. En México solo se consideran médicamente significativos dos géneros de arañas: viuda negra y araña violinista. Sin embargo, este caso involucró a una araña del suborden Mygalomorphae, que incluye a las tarántulas. Su veneno, compuesto por diversas sustancias, puede desencadenar respuestas exageradas en individuos sensibles, como en este caso. Esto ofrece perspectivas sobre las complejidades de las picaduras de araña y sus efectos neurológicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Myoclonus, characterized by sudden, involuntary muscle movements, typically arises from several acute neurological insults. This case report introduces a unique instance of generalized myoclonus triggered by a spider bite from a species phylogenetically linked to tarantulas. A 41-year-old woman presented with sudden jerky movements following a spider bite 2 weeks earlier. Accompanying symptoms included skin lesions, pain, itching, and fever. Examination revealed generalized, action-triggered jerky movements, classified as myoclonus. Despite thorough evaluation, including brain magnetic resonance imaging, electroencephalography, and extensive laboratory tests, no abnormalities were detected except for abnormal electromyography findings consistent with myoclonus. Excluding infectious, metabolic, and structural causes, the spider bite emerged as the most plausible etiology, involving a spider from the Mygalomorphae suborder. Treatment with clonazepam, trihexyphenidyl, and doxycycline significantly improved myoclonus within 24 h. One month later, the patient remained asymptomatic. This case challenges conventional diagnostic paradigms and underscores the importance of considering unconventional etiologies in cases that defy traditional explanations. In Mexico, only black widow and violinist spiders are recognized for their medical significance. However, this case involved a spider from the Mygalomorphae suborder, which includes tarantulas. Tarantula venom typically induces pain, local tissue necrosis, and, rarely, muscle cramping, with a generally favorable prognosis. The venom consists of low molecular mass compounds, antimicrobial peptides, cysteine-rich neurotoxic peptides, enzymes, and proteins, potentially acting synergistically.This case suggests that components of the Mygalomorphae suborder venom may induce exaggerated responses in sensitive individuals. It offers insights into the complexities of arachnid envenomations and their neurological consequences.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Mioclono]]></kwd>
<kwd lng="es"><![CDATA[Picadura de araña]]></kwd>
<kwd lng="es"><![CDATA[Tarántula]]></kwd>
<kwd lng="es"><![CDATA[Trastorno neurológico]]></kwd>
<kwd lng="es"><![CDATA[Síntomas inducidos por veneno]]></kwd>
<kwd lng="en"><![CDATA[Myoclonus]]></kwd>
<kwd lng="en"><![CDATA[Spider bite]]></kwd>
<kwd lng="en"><![CDATA[Tarantula]]></kwd>
<kwd lng="en"><![CDATA[Neurological disorder]]></kwd>
<kwd lng="en"><![CDATA[Venom-induced symptoms]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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