<?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>1688-1249</journal-id>
<journal-title><![CDATA[Archivos de Pediatría del Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Pediatr. Urug.]]></abbrev-journal-title>
<issn>1688-1249</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Uruguaya de Pediatría]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-12492020000600348</article-id>
<article-id pub-id-type="doi">10.31134/ap.91.6.3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Encefalopatía subaguda adquirida del lactante por deficiencia de vitamina B12 materna]]></article-title>
<article-title xml:lang="en"><![CDATA[Subacute acquired encephalopathy secondary to maternal vitamin B12 deficiency]]></article-title>
<article-title xml:lang="pt"><![CDATA[Encefalopatia subaguda adquirida em lactente devida à deficiência materna de vitamina B12]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosas]]></surname>
<given-names><![CDATA[Melania]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medici]]></surname>
<given-names><![CDATA[Conrado]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lemes]]></surname>
<given-names><![CDATA[Aída]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerisola]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lombardo]]></surname>
<given-names><![CDATA[Natalia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tourreilles]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UDELAR Facultad de Medicina Clínica Neuropediatría]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UDELAR Facultad de Medicina Cátedra Neuropediatría]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,UDELAR Facultad de Medicina Cátedra Neuropediatría]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Corporación Médica de Paysandú  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af5">
<institution><![CDATA[,Sanatorio Americano Servicio Pediatría ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af6">
<institution><![CDATA[,Sanatorio Americano Servicio Pediatría Área Cuidados Moderados]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af7">
<institution><![CDATA[,UDELAR Facultad de Medicina Cátedra Neuropediatría]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>91</volume>
<numero>6</numero>
<fpage>348</fpage>
<lpage>358</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-12492020000600348&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-12492020000600348&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-12492020000600348&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Introducción:  la deficiencia de vitamina B12 es infrecuente en la edad pediátrica. Puede producir síntomas neurológicos y hematológicos de diferente severidad. Si no se diagnostica y trata oportunamente, puede determinar secuelas neurológicas permanentes.  Objetivos:  presentar una serie de casos clínicos de encefalopatía secundaria a déficit materno de vitamina B12, discutir su potencial severidad y resaltar la importancia de las medidas de prevención.  Metodología:  estudio observacional basado en la revisión de las historias clínicas de lactantes con criterios clínicos y de laboratorio compatibles con encefalopatía por deficiencia de vitamina B12 materna.  Resultados:  se incluyeron cuatro casos clínicos, con edades entre 7 y 15 meses, que presentaron una encefalopatía subaguda por deficiencia de vitamina B12 secundaria a déficit materno luego de un período libre de síntomas, con rechazo del alimento, detención del crecimiento, adelgazamiento, irritabilidad, apatía, regresión del desarrollo, movimientos extrapiramidales y desaceleración de la velocidad del crecimiento del perímetro craneano. Los exámenes complementarios revelaron anemia megaloblástica, niveles bajos de vitamina B12 en el suero, hiperhomocisteinemia y aciduria metilmalónica. Se realizó tratamiento con vitamina B12 con buena evolución posterior.  Discusión:  la deficiencia de vitamina B12 debe considerarse en el diagnóstico diferencial de lactantes con regresión del desarrollo, movimientos involuntarios de inicio agudo o subagudo, convulsiones y apatía, especialmente si se asocian a anemia megaloblástica. Dado que la sintomatología es relativamente inespecífica, se requiere un alto grado de sospecha para realizar el diagnóstico precoz. El tratamiento es sencillo y eficaz y, de ser precoz, puede prevenir el daño cerebral permanente o la muerte.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary:  Introduction:  cobalamin or vitamin B12 deficiency is unusual in childhood. It may cause neurologic and hematologic symptoms of diverse severity. If not diagnosed and treated on time, it can lead to a severe clinical case of permanent neurological sequelae. The purpose of this study is to report four clinical cases of infants with subacute encephalopathy due to vitamin B12 deficiency after a maternal deficit, discuss its potential severity and emphasize the importance of preventive measures.  Methods:  observational study based on a review of clinical records of infants that showed clinical and laboratory criteria compatible with encephalopathy secondary to maternal vitamin B12 deficiency.  Results:  four infants between 7 and 15 months of age were included. They were diagnosed with vitamin B12 deficiency secondary to a maternal deficit. Clinically, they had had a symptom-free period followed by rejection of food, growth arrest, failure to thrive, irritability, apathy, regression of development, extrapyramidal movements and deceleration of cranial perimeter growth. They showed megaloblastic anemia, low serum B12 vitamin levels, hyperhomocysteinemia, and methylmalonic aciduria. They were treated with parenteral B12 vitamin and showed a favorable evolution.  Discussion:  vitamin B12 deficiency should always be analyzed in the differential diagnosis of infants with developmental regression, involuntary acute onset movements, seizures and apathy, especially associated with megaloblastic anemia. Due to its fairly unspecific clinical features, it high levels of suspicion and an early diagnosis are required. Treatment is simple and effective and can prevent permanent brain damage if started early.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo:  Introdução: a deficiência de vitamina B12 é pouco frequente na idade pediátrica. Pode produzir sintomas neurológicos e hematológicos de diferentes níveis de gravidade. Se não for diagnosticada e tratada prontamente, pode determinar sequelas neurológicas permanentes.  Objetivos: apresentar uma série de casos clínicos de encefalopatia devida à deficiência materna de vitamina B12, discutir sua potencial gravidade e destacar a importância de medidas preventivas.  Metodologia:  estudo observacional baseado na revisão de prontuários de lactentes com critérios clínicos e laboratoriais compatíveis com encefalopatia por deficiência materna de vitamina B12.  Resultados: foram incluídos 4 casos clínicos, com idades entre 7 e 15 meses, que apresentaram encefalopatia subaguda por deficiência de vitamina B12 devida à deficiência materna após período livre de sintomas, com rejeição alimentar, parada de crescimento, perda de peso, irritabilidade, apatia, regressão do desenvolvimento, movimentos extrapiramidais e desaceleração da taxa de crescimento do perímetro cefálico. Os exames complementares revelaram anemia megaloblástica, baixos níveis séricos de vitamina B12, hiper-homocisteinemia e acidúria metilmalônica. O tratamento com vitamina B12 foi realizado com boa evolução subsequente.  Discussão: a deficiência de vitamina B12 deve ser avaliada no diagnóstico diferencial de lactentes com regressão do desenvolvimento, movimentos involuntários de início agudo ou subagudo, convulsões e apatia, principalmente se estiverem associados à anemia megaloblástica. Como os sintomas são relativamente inespecíficos, é necessário um alto grau de suspeição para poder realizar o diagnóstico precoce. O tratamento é simples e eficaz e, se realizado precocemente, pode prevenir danos cerebrais permanentes ou morte.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Encefalopatía]]></kwd>
<kwd lng="es"><![CDATA[Deficiencia de vitamina B12]]></kwd>
<kwd lng="es"><![CDATA[Lactante]]></kwd>
<kwd lng="en"><![CDATA[Brain diseases]]></kwd>
<kwd lng="en"><![CDATA[Vitamin B12 deficiency]]></kwd>
<kwd lng="en"><![CDATA[Infant]]></kwd>
<kwd lng="pt"><![CDATA[Encefalopatia]]></kwd>
<kwd lng="pt"><![CDATA[Deficiência de vitamina B12]]></kwd>
<kwd lng="pt"><![CDATA[Lactente]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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