<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932011000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación neurofuncional del tallo cerebral Parte II: Reflejo mandibular]]></article-title>
<article-title xml:lang="en"><![CDATA[Neurofunctional evaluation of brain stem. II: Mandibular reflex]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leon-Sarmiento]]></surname>
<given-names><![CDATA[Fidias E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pabón Porras]]></surname>
<given-names><![CDATA[María Angélica]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granadillo Deluque]]></surname>
<given-names><![CDATA[Elías David]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Mediciencias Research Group ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Departamento de Medicina Interna Sección de Medicina Aeroespacial]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Fundación Neuromédica Colombo-Americana Ramón & Cajal  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<volume>24</volume>
<numero>3</numero>
<fpage>299</fpage>
<lpage>307</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932011000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932011000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932011000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El reflejo mandibular o maseterino posee conexiones nerviosas únicas, diferentes de las exhibidas por otros reflejos monosinápticos humanos, y permite evaluar, de forma fácil y eficiente, el tallo cerebral por medio de la estimulación mecánica, eléctrica o magnética. Diversos estudios han demostrado la participación en este reflejo de las interneuronas del tallo cerebral y su modulación por estructuras supraespinales, que hacen parte fundamental de su integración motora. El reflejo mandibular es útil para evaluar la afectación trigémino-trigeminal en polineuropatías como la diabetes, neuromiopatías como la esclerosis múltiple y en pacientes con trastornos del movimiento, con o sin disfunción oromandibular. La evaluación neurofuncional de este reflejo craneofacial ayuda a identificar la integración sensorimotora del tallo cerebral y las posibles alteraciones de estas vías reflejas, debidas a anormalidades del sistema nervioso central o del periférico. Su apropiada ejecución e interpretación, clínica y neurológica, permite aplicar de manera más personalizada diversos protocolos de neurorrehabilitación, con el fin de ayudar a mejorar la calidad de vida de los individuos con afectación de estas vías neurales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The masseter or mandibular reflex has unique neural connections, different from those exhibited by other human monosynaptic reflexes; thus, it is useful to evaluate in an easy and efficient way the human brain stem. It is possible to elicit this reflex by using mechanical, electrical or magnetic stimulation. Several investigations have demonstrated the participation of brain stem interneurons in this human reflex, as well as its modulation by supraspinal structures, which are a fundamental part of its motor integration. This reflex is useful to evaluate the trigemino-trigeminal involvement in poly-neuropathies such as diabetes, neuromyeolopathies such as multiple sclerosis, and in patients with movement disorders, regardless of oromandibular dysfunction. Neurofunctional evaluation of this reflex may be useful to study the sensorimotor integration of the brain stem and the alterations due to abnormalities of the central or peripheral nervous system. Its proper interpretation may be the basis to apply different neuro-rehabilitation protocols thus improving the quality of life of individuals with involvement of these neural pathways.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enfermedades Desmielinizantes]]></kwd>
<kwd lng="es"><![CDATA[Tronco Encefálico]]></kwd>
<kwd lng="es"><![CDATA[Reflejo/fisiología]]></kwd>
<kwd lng="en"><![CDATA[Brain stem]]></kwd>
<kwd lng="en"><![CDATA[Demyelinating diseases]]></kwd>
<kwd lng="en"><![CDATA[Reflex/physiological]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Evaluaci&oacute;n neurofuncional del tallo cerebral   Parte II: Reflejo mandibular</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> Neurofunctional evaluation of brain stem. II. Mandibular reflex</b></font></p>     <p align="center">&nbsp;</p>     <p align="center">&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> Fidias E. Leon-Sarmiento<sup>1,2</sup>; Mar&iacute;a Ang&eacute;lica Pab&oacute;n Porras<sup>3</sup>; El&iacute;as David Granadillo Deluque<sup>4</sup></b>    </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1 MD, MSc, PhD, Unidad de Parkinson y Movimientos Anormales, Mediciencias Research Group, Universidad Nacional, Bogot&aacute;, Colombia.</font> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="mailto:feleones@gmail.com">feleones@gmail.com</a></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 2 MD, MSc, PhD, Profesor de Ciencias Neurol&oacute;gicas, Secci&oacute;n de Medicina Aeroespacial, Departamento de Medicina Interna, Universidad Nacional, Bogot&aacute;, Colombia.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3 MD &#40;e&#41;, Estudiante de Medicina, Universidad Nacional, Bogot&aacute;, Colombia.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 4 MD, Laboratorio de Neurociencias Cl&iacute;nicas, Neuro.net, Fundaci&oacute;n Neurom&eacute;dica Colombo-Americana Ram&oacute;n &#38; Cajal, Bogot&aacute;, Colombia.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Unidad de Parkinson y Movimientos Anormales, Mediciencias Research Group, Calle 50 No. 8-27 &#40;604&#41;,   Bogot&aacute;, Colombia; Tel/Fax: 3112427571</font> </p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> RESUMEN</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El reflejo mandibular o maseterino posee conexiones nerviosas &uacute;nicas, diferentes de las exhibidas   por otros reflejos monosin&aacute;pticos humanos, y permite evaluar, de forma f&aacute;cil y eficiente,   el tallo cerebral por medio de la estimulaci&oacute;n mec&aacute;nica, el&eacute;ctrica o magn&eacute;tica. Diversos   estudios han demostrado la participaci&oacute;n en este reflejo de las interneuronas del tallo cerebral   y su modulaci&oacute;n por estructuras supraespinales, que hacen parte fundamental de su integraci&oacute;n   motora. El reflejo mandibular es &uacute;til para evaluar la afectaci&oacute;n trig&eacute;mino-trigeminal en   polineuropat&iacute;as como la diabetes, neuromiopat&iacute;as como la esclerosis m&uacute;ltiple y en pacientes   con trastornos del movimiento, con o sin disfunci&oacute;n oromandibular. La evaluaci&oacute;n neurofuncional   de este reflejo craneofacial ayuda a identificar la integraci&oacute;n sensorimotora del   tallo cerebral y las posibles alteraciones de estas v&iacute;as reflejas, debidas a anormalidades del   sistema nervioso central o del perif&eacute;rico. Su apropiada ejecuci&oacute;n e interpretaci&oacute;n, cl&iacute;nica y   neurol&oacute;gica, permite aplicar de manera m&aacute;s personalizada diversos protocolos de neurorrehabilitaci&oacute;n,   con el fin de ayudar a mejorar la calidad de vida de los individuos con afectaci&oacute;n   de estas v&iacute;as neurales.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> PALABRAS CLAVE</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i> Enfermedades Desmielinizantes, Tronco Encef&aacute;lico, Reflejo/fisiolog&iacute;a</i> </font></p> <hr noshade size="1">     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> The masseter or mandibular reflex has unique neural connections, different from those   exhibited by other human monosynaptic reflexes; thus, it is useful to evaluate in an easy and efficient way the human brain stem. It is possible to   elicit this reflex by using mechanical, electrical or   magnetic stimulation. Several investigations have   demonstrated the participation of brain stem interneurons   in this human reflex, as well as its modulation   by supraspinal structures, which are a fundamental   part of its motor integration. This reflex is useful   to evaluate the trigemino-trigeminal involvement   in poly-neuropathies such as diabetes, neuromyeolopathies   such as multiple sclerosis, and in   patients with movement disorders, regardless of oromandibular   dysfunction. Neurofunctional evaluation   of this reflex may be useful to study the sensorimotor   integration of the brain stem and the alterations due   to abnormalities of the central or peripheral nervous   system. Its proper interpretation may be the basis   to apply different neuro-rehabilitation protocols   thus improving the quality of life of individuals with   involvement of these neural pathways.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>KEY WORDS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i> Brain stem, Demyelinating diseases, Reflex/physiological</i></font> </p> <hr noshade size="1">     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> INTRODUCCI&Oacute;</b>N</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los avances hechos en diferentes ramas de las   ciencias neurol&oacute;gicas, incluyendo las moleculares,   han permitido, desde hace ya varias d&eacute;cadas,   detectar, comprender y clarificar mejor numerosos   procesos fisiopatol&oacute;gicos; sin embargo, a pesar de   dichos avances, en ocasiones no es posible identificar   algunas anormalidades en pacientes con trastornos   neurol&oacute;gicos en las v&iacute;as aferentes, en el procesamiento   central o en las v&iacute;as eferentes relacionadas con los   pares craneales, evaluados por los m&aacute;s avezados   cl&iacute;nicos &#40;1,2&#41;. De forma reciente, por ejemplo, una   paciente de 62 a&ntilde;os, con degeneraci&oacute;n corticobasal,   recibi&oacute; durante aproximadamente cuatro a&ntilde;os   m&uacute;ltiples dosis de toxina botul&iacute;nica, en diferentes   m&uacute;sculos faciales, sin lograr mejor&iacute;a, debido a un   diagn&oacute;stico err&oacute;neo de blefaroespasmo esencial   benigno, hecho por profesionales relacionados con   las ciencias neurol&oacute;gicas en el oriente colombiano   &#40;observaciones no publicadas&#41;. Es en estos casos,   principalmente, en los que se hace obligatorio   evaluar estas estructuras supraespinales por medios   neurol&oacute;gicos funcionales, para poder cuantificar   mejor las posibles alteraciones de dichos &oacute;rganos, con   el fin de ubicar, de una manera mucho m&aacute;s exacta, el   sitio de la lesi&oacute;n &#40;3,4&#41;, paradigma fundamental en el   diagn&oacute;stico neurol&oacute;gico cl&iacute;nico.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Con este fin, en un manuscrito previo, hicimos   una amplia actualizaci&oacute;n sobre las v&iacute;as reflejas que   transportan informaci&oacute;n neural en la mitad superior   de la cara, espec&iacute;ficamente las relacionadas con   las v&iacute;as trig&eacute;mino-faciales &#40;2&#41;. Presentamos ahora   la neurolog&iacute;a funcional relacionada con las v&iacute;as   trig&eacute;mino-trigeminales que permite conocer el estado   cl&iacute;nico y subcl&iacute;nico de la regi&oacute;n inferior de la cara de los   seres humanos, enfatizando en este caso la generaci&oacute;n,   an&aacute;lisis, interpretaci&oacute;n y aplicaci&oacute;n del reflejo   maseterino &#40;RM&#41;, obtenido por estimulaci&oacute;n manual,   mec&aacute;nica y el&eacute;ctrica del nervio mentoniano, mientras   la musculatura facial se encuentra en reposo o durante   activaci&oacute;n voluntaria. El RM, descrito por Morris James   Lewis en 1885 &#40;5&#41;, ha sido atribuido por algunos, de   manera err&oacute;nea, a De Watteville &#40;6&#41;; contribuye en   los seres humanos a darle estabilidad funcional a la   mand&iacute;bula y sus movimientos asociados &#40;7&#41;.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>METODOLOG&Iacute;A</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En la pr&aacute;ctica cl&iacute;nica, el sujeto mantiene la boca entreabierta   y, mientras est&aacute; en esa posici&oacute;n, se le percute   con el martillo de reflejos el ment&oacute;n o, tambi&eacute;n,   se pone un dedo &iacute;ndice transversalmente debajo del   labio inferior, y sobre &eacute;l se percute con el martillo de   reflejos. Tambi&eacute;n se puede obtener este reflejo al introducir   un bajalenguas en la boca, apoyarlo en la arcada   dentaria inferior y percutir sobre &eacute;l. La respuesta,   en cualquiera de los casos, deber&aacute; ser siempre la   elevaci&oacute;n de la mand&iacute;bula.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Este reflejo se califica de manera visual y subjetiva   con un valor de cero si est&aacute; ausente; una cruz, si est&aacute;   presente y se considera normal, o dos cruces, si se   encuentra exaltado &#40;3,4&#41;. Es de notar que la calificaci&oacute;n   de este reflejo es muy diferente a la que se utiliza en los   dem&aacute;s reflejos tendinomusculares humanos. Cuando   esta evaluaci&oacute;n sugiere anormalidad de los pares   craneales involucrados, se recomienda investigar estas v&iacute;as, de manera m&aacute;s estricta, por m&eacute;todos   neurol&oacute;gicos funcionales y cuantitativos &#40;8&#41;. Entre   estos m&eacute;todos est&aacute;n los tradicionales, como el uso de   un martillo conectado a un equipo de electromiograf&iacute;a,   con el cual se golpea la regi&oacute;n mandibular de la   forma ya descrita en la evaluaci&oacute;n f&iacute;sica o, tambi&eacute;n,   aplicando estimulaci&oacute;n el&eacute;ctrica transcut&aacute;nea sobre   el nervio mentoniano, cuyas respuestas se registran,   tambi&eacute;n, en un equipo de electromiograf&iacute;a &#40;1&#41;. M&aacute;s   recientemente se ha informado que la estimulaci&oacute;n   magn&eacute;tica transcraneal usada, como su nombre lo   indica, para estimular las v&iacute;as neurales de forma no   invasiva y transcraneal &#40;9&#41; tambi&eacute;n reproduce el RM   al estimular la rama motora del nervio trig&eacute;mino &#40;10&#41;.   Enfatizaremos en este manuscrito los estudios hechos   por estimulaci&oacute;n mec&aacute;nica y el&eacute;ctrica, por ser estas   t&eacute;cnicas ampliamente validadas a nivel mundial.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Cuando el examinador golpea la mand&iacute;bula del sujeto   con un martillo conectado a un microinterruptor,   este dispara el osciloscopio del electromi&oacute;grafo.   Las respuestas neuromusculares sencillas o &uacute;nicas   se registran simult&aacute;neamente en los dos lados de la   cara con electrodos de superficie. El electrodo activo   se pone en el tercio inferior del m&uacute;sculo masetero,   entre el zigoma y el borde inferior de la mand&iacute;bula;   el electrodo de referencia se pone por debajo del   &aacute;ngulo mandibular, y el llamado electrodo de tierra   se pone en la frente, en la nuca o en el brazo &#40;11-16&#41;   &#40;<a href="#f1">figura n.&#186; 1</a>&#41;. El golpe del martillo se debe aplicar en   la mand&iacute;bula a intervalos de 10 segundos o m&aacute;s. Cabe   recordar que el estado dental, la fuerza con que se   hace la oclusi&oacute;n dental y la posici&oacute;n de la mand&iacute;bula   afectan estas respuestas reflejas &#40;17-19&#41;. En individuos   obesos, a veces, es dif&iacute;cil obtener el reflejo con   electrodos de superficie, por lo que se hace necesario   utilizar electrodos de aguja &#40;15&#41;. La amplitud del RM   disminuye con la edad y es menor en hombres que en   mujeres &#40;19,20&#41;.</font></p>     <p align="center"><a name="f1"></a><img src="img/revistas/iat/v24n3/v24n3a8f1.jpg"></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> De otro lado, cuando se aplica un est&iacute;mulo el&eacute;ctrico   en la llamada tercera rama del nervio trig&eacute;mino,   o rama motora, mientras el sujeto que se est&aacute;   evaluando mantiene una contracci&oacute;n voluntaria de   los m&uacute;sculos de la masticaci&oacute;n, se genera el llamado   reflejo inhibitorio maseterino &#40;RIM&#41; que se denomina   per&iacute;odo cut&aacute;neo silente o supresi&oacute;n exteroceptiva   refleja; lo describieron en 1948 Hoffman y Tonnies   al aplicar est&iacute;mulos el&eacute;ctricos en la lengua &#40;6&#41;.   Hacia 1984, Cruccu y colaboradores describieron   la participaci&oacute;n interneuronal del tallo cerebral en   este reflejo &#40;13-18&#41;, as&iacute; como su modulaci&oacute;n por   estructuras supraespinales en individuos normales y   en diversas enfermedades neurol&oacute;gicas &#40;7&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El RIM se registra tambi&eacute;n, de manera bilateral, con   los electrodos puestos de la misma forma usada para   la obtenci&oacute;n del RM, con estimulaci&oacute;n &uacute;nica. En el   caso del RIM, los sujetos deben apretar los dientes tan   fuertemente como les sea posible, por un per&iacute;odo de dos   a tres segundos con retroalimentaci&oacute;n auditiva. El RIM   se puede medir solamente si el individuo es capaz de   apretar los dientes y produce un patr&oacute;n de interferencia   electromiogr&aacute;fico completo. En ocasiones, cuando   hay contaminaci&oacute;n muscular facial, el registro se   hace con electrodos de aguja, conc&eacute;ntricos, en lugar   de electrodos de superficie. Usualmente el est&iacute;mulo   el&eacute;ctrico dura 0,2 milisegundos y se aplica en la rama   motora del nervio trig&eacute;mino, mediante electrodos de   superficie puestos sobre el foramen respectivo. La   intensidad del est&iacute;mulo ser&aacute; dos a tres veces el umbral   reflejo &#40;11-16&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Posterior a esto, se efect&uacute;an de ocho a 16 registros   con 10 a 30 segundos de descanso entre las   contracciones de los m&uacute;sculos masticatorios &#40;<a href="#f2">figura   n.&#186; 2</a>&#41;. Para medir el RIM, usualmente se tiene en   cuenta la latencia, bien sea como el &uacute;ltimo pico   del electromiograma o como el &uacute;ltimo cruce de la   actividad electromiogr&aacute;fica sobre la l&iacute;nea isoel&eacute;ctrica   o, en otros casos, esta se mide al comienzo de la   actividad electromiogr&aacute;fica. Cualquiera de estos   m&eacute;todos es satisfactorio en la pr&aacute;ctica cl&iacute;nica,   siempre y cuando la forma de medir el reflejo se   mantenga y, adem&aacute;s, se analicen las diferencias   intraindividuales que se obtengan de los registros   captados en las hemicaras derecha e izquierda de los   individuos evaluados &#40;6,17&#41;. La magnitud de la fuerza   que el individuo hace en la musculatura orofacial   influye sobre los per&iacute;odos silentes que se obtienen.</font></p>     <p align="center"><a name="f2"></a><img src="img/revistas/iat/v24n3/v24n3a8f2.jpg"></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Otra forma de medir la actividad refleja trig&eacute;minotrigeminal   es realizando la curva de recuperaci&oacute;n   del RIM; esta se utiliza para evaluar la excitabilidad   de las interneuronas inhibitorias del tallo cerebral, en   pacientes con trastornos del movimiento o disfunci&oacute;n   oromandibular. La posici&oacute;n de los electrodos de   estimulaci&oacute;n y registro es la misma que se emplea   con la estimulaci&oacute;n simple. Asimismo, la forma de   graficar este reflejo es similar a la utilizada en la curva   de recuperaci&oacute;n del reflejo del parpadeo &#40;RP&#41; &#40;2,11&#41;. </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>NEUROBIOLOG&Iacute;A CL&Iacute;NICA</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La neurobiolog&iacute;a del reflejo mandibular obtenido   por estimulaci&oacute;n mec&aacute;nica o el&eacute;ctrica difiere, en   algunos aspectos, de la descrita para otros reflejos   musculotendinosos, considerados monosin&aacute;pticos   &#40;1,6,11&#41;. De manera particular y &uacute;nica, las neuronas   sensitivas primarias de las fibras aferentes tienen su   cuerpo celular dentro del sistema nervioso central,   en el n&uacute;cleo mecencef&aacute;lico trigeminal, a nivel del   cerebro medio y no en el ganglio nervioso, como   sucede en otras v&iacute;as reflejas. Dichas fibras aferentes   salen de los husos musculares presentes en los   m&uacute;sculos que cierran la quijada &#40;17&#41;. Posteriormente,   las ramas nerviosas colaterales cortas de la tercera   rama del nervio trig&eacute;mino se conectan de forma   monosin&aacute;ptica y sin&eacute;rgica con las motoneuronas que   controlan el cierre de la mand&iacute;bula, pero no cruzan la   l&iacute;nea media; la funci&oacute;n de estas estructuras neurales   no se modifica con la activaci&oacute;n cognitiva voluntaria   &#40;21&#41;. La vibraci&oacute;n muscular que, usualmente, inhibe   los reflejos H y T aumenta la amplitud del RM &#40;18&#41;. Las   alteraciones supratentoriales no afectan la latencia   del RM obtenido por estimulaci&oacute;n sencilla con   martillo piezoel&eacute;ctrico &#40;18-20&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> De otro lado, la estimulaci&oacute;n el&eacute;ctrica o mec&aacute;nica   aplicada a la boca o la piel de la regi&oacute;n maxilar   o mandibular, mientras el individuo contrae   voluntariamente los m&uacute;sculos masticatorios, produce   activaciones neurales diversas que inhiben la acci&oacute;n   de los m&uacute;sculos que cierran la mand&iacute;bula y genera   los llamados per&iacute;odos silentes &#40;SP, por la sigla en   ingl&eacute;s de <i>silent periods</i>&#41;, que en este caso son dos,   denominados SP1 y SP2, modulados por mecanismos   gaba&eacute;rgicos, entre otros neurotransmisores &#40;20,22,23&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se considera que la tercera rama del nervio trig&eacute;mino,   o rama motora, hace parte del arco aferente que   transmite la informaci&oacute;n para generar los per&iacute;odos   silentes asociados al RM, pero a&uacute;n no existe consenso   sobre si dicha informaci&oacute;n aferente involucra   tambi&eacute;n la transmisi&oacute;n de informaci&oacute;n nociceptiva   &#40;2,11,17&#41;. La existencia de per&iacute;odos silentes en estos   m&uacute;sculos faciales, probablemente, juega un papel   importante en el control de la masticaci&oacute;n, y sirve   para prevenir un da&ntilde;o intraoral que podr&iacute;a ocurrir   en contracciones no controladas de los m&uacute;sculos que   cierran la mand&iacute;bula y los movimientos de la misma   durante el lenguaje &#40;11-16&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El primer per&iacute;odo silente &#40;SP1&#41; involucra, muy   probablemente, una interneurona inhibitoria   localizada cerca del n&uacute;cleo trigeminal, ipsilateral   al sitio de estimulaci&oacute;n, que se proyecta de forma   bilateral sobre las motoneuronas encargadas de   controlar el cierre de la mand&iacute;bula &#40;19,20&#41;. Las fibras   aferentes relacionadas con la generaci&oacute;n del segundo   per&iacute;odo silente &#40;SP2&#41; descienden en el tracto trigeminal   espinal y se conectan con una cadena polisin&aacute;ptica   de interneuronas excitatorias, localizadas en la   formaci&oacute;n reticular lateral medular, a nivel de la uni&oacute;n   pontomedular; la &uacute;ltima interneurona de esta cadena   de est&iacute;mulos es de tipo inhibitorio y se conecta con fibras   colaterales, tanto ipsilaterales como contralaterales,   que ascienden en los complejos trigeminales espinales   derecho e izquierdo, para alcanzar las motoneuronas   trigeminales. El circuito neural completo reposa sobre   el puente medio &#40;11-14,17&#41;. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>VALORES NORMALES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El RM va madurando a medida que aumenta la edad   &#40;24&#41;. En general, en el adulto normal, la latencia de   dicho reflejo, obtenido al golpear la mand&iacute;bula con   un martillo de reflejos, es de 7 a 8,5 milisegundos &#40;25&#41;.   Estudios m&aacute;s recientes han demostrado que tambi&eacute;n   es posible encontrar respuestas reflejas maseterinas   con latencias mayores, cuando se modifica la fuerza   que se aplica a los m&uacute;sculos de la masticaci&oacute;n durante   la evaluaci&oacute;n neurofuncional &#40;26,27&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La comparaci&oacute;n de las latencias registradas de forma   bilateral es de gran valor cl&iacute;nico &#40;<a href="#f3">figura n.&#186; 3</a>&#41;. Una   diferencia de m&aacute;s de 0,8 milisegundos o la ausencia   unilateral del reflejo es indicativa de anormalidad. La   ausencia bilateral del RM en un individuo mayor de   65 a&ntilde;os no tiene significado cl&iacute;nico definitivo &#40;11-16&#41;.   Los valores normales de las latencias del SP1 y el SP2   est&aacute;n en un rango de 10 a 15 y 40 a 50 milisegundos,   respectivamente. La diferencia de latencias ipsilateral   y contralateral al sitio de estimulaci&oacute;n es, en   individuos normales, menor de dos milisegundos   para el SP1 y de seis milisegundos para el SP2. En   ocasiones, el SP1 y el SP2 pueden aparecer como un   per&iacute;odo silente &uacute;nico; en este caso se consideran los   valores de SP2 &#40;6,11-17&#41;.</font></p>     ]]></body>
<body><![CDATA[<p align="center"><a name="f3"></a><img src="img/revistas/iat/v24n3/v24n3a8f3.jpg"></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La curva de recuperaci&oacute;n del SP1 y el SP2 es del   85&#37; y 24&#37; a los 100 milisegundos de intervalo entre los est&iacute;mulos pareados, y del 96&#37; y 79&#37; a los   500 milisegundos. Desde el punto de vista cl&iacute;nico,   usualmente se mide la recuperaci&oacute;n del SP2 a un   intervalo de estimulaci&oacute;n de 250 milisegundos, la que   alcanza all&iacute; el 60&#37; &#40;6,13,14&#41;.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> APLICACIONES CL&Iacute;NICAS</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El RM obtenido con est&iacute;mulo sencillo es &uacute;til para   evaluar neuropat&iacute;as craneales &#40;13-15&#41;. La anormalidad   m&aacute;s com&uacute;n es la ausencia del RM, m&aacute;s las que   alteraciones de su latencia, la cual se encuentra   prolongada en enfermedades desmielinizantes   como la esclerosis m&uacute;ltiple &#40;12,15&#41;. Diversos factores   pueden modificar este reflejo, pero un retardo   unilateral inequ&iacute;voco, o su ausencia, sugiere una   lesi&oacute;n de la rama motora del nervio trig&eacute;mino o de   sus centros integradores en el tallo cerebral; cuando   esta alteraci&oacute;n se asocia con una respuesta anormal   del RP, principalmente la primera respuesta llamada   R1, sugiere una lesi&oacute;n pontina rostral &#40;6,11,15,17&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El RM puede ser normal aun en presencia de arreflexia   tendinomuscular axial, en pacientes con s&iacute;ntomas   sensitivos puros, lo que favorece el diagn&oacute;stico de   una ganglionopat&iacute;a &#40;14,15&#41;. Dicha normalidad se   puede observar tambi&eacute;n en pacientes con s&iacute;ndrome   de Sj&ouml;gren y en la enfermedad de Kennedy &#40;28-30&#41;.   En la ataxia de Friedrich, que se caracteriza por   presentar reflejos tendinomusculares hipoactivos,   el RM puede estar normal o, parad&oacute;jicamente,   hiperactivo &#40;12&#41;. El RM, a su vez, puede estar abolido   en algunas neuropat&iacute;as sensoriales con afectaci&oacute;n   de v&iacute;as sensitivas intraorales, dando origen a un   da&ntilde;o grave en la masticaci&oacute;n y salivaci&oacute;n &#40;23,31&#41;.   La edad, la cooperaci&oacute;n durante la generaci&oacute;n del   RM, el grado de relajaci&oacute;n muscular, la posici&oacute;n de   la mand&iacute;bula y las anormalidades de la oclusi&oacute;n   dental influyen directamente en los valores de las   latencias y amplitudes del RM &#40;30-33&#41;. Pacientes con   trastornos temporomandibulares &#40;34-38&#41; presentan   una respuesta refleja muy asim&eacute;trica, o puede aun   estar ausente de forma unilateral &#40;34-41&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Por su parte, el RIM obtenido con estimulaci&oacute;n   el&eacute;ctrica sencilla suele estar ausente en pacientes con   t&eacute;tanos, mientras que en lesiones de la articulaci&oacute;n   temporomandibular aumenta su duraci&oacute;n &#40;6,33,35&#41;.   En pacientes con s&iacute;ndrome de Wallemberg se   encuentran diversas anormalidades de estos reflejos   que no son concluyentes &#40;11-16&#41;. La prolongaci&oacute;n   de las latencias de los per&iacute;odos silentes puede ser   el reflejo de trastornos en la conducci&oacute;n proximal   en polineuropat&iacute;as de diversas causas, incluyendo   la diabetes y la neuropat&iacute;a del trig&eacute;mino &#40;41-43&#41;. En esta &uacute;ltima entidad, el SP1 es el par&aacute;metro   que m&aacute;s se altera, similar a lo que se observa en la   esclerosis m&uacute;ltiple &#40;40-44&#41;. La curva de recuperaci&oacute;n   del RIM, hecha con estimulaci&oacute;n pareada, muestra   una disminuci&oacute;n de la inhibici&oacute;n suprasegmental en   la enfermedad de Parkinson, la cual es normal en la   enfermedad de Hungtinton &#40;11,44&#41;.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUSI&Oacute;N</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El reflejo maseterino es una forma relativamente f&aacute;cil   de evaluar, cl&iacute;nica y funcionalmente, el tallo cerebral   y sus conexiones supraespinales en diversas enfermedades   neuromusculares, principalmente las de tipo   desmielinizante, y en algunos trastornos del movimiento   &#40;1,14,16&#41;. Cuando este estudio se efect&uacute;a junto   con otros reflejos faciales, aumenta la probabilidad de   establecer un diagn&oacute;stico m&aacute;s apropiado y de localizar   la lesi&oacute;n de manera m&aacute;s precisa; adem&aacute;s, permite   hacer seguimientos cl&iacute;nicos y subcl&iacute;nicos m&aacute;s estrictos   que los efectuados con las evaluaciones convencionales   &#40;45-49&#41;. Los resultados obtenidos al usar los   diferentes tipos de estimulaci&oacute;n mencionados en este   trabajo, as&iacute; como la aplicaci&oacute;n de nuevas t&eacute;cnicas y   metodolog&iacute;as relacionadas con la actividad muscular   facial de los humanos &#40;50-52&#41;, incluyendo el uso de la   estimulaci&oacute;n magn&eacute;tica, permitir&aacute;n tambi&eacute;n definir   programas de neurorrehabilitaci&oacute;n m&aacute;s apropiados   que los actuales, lo que sin duda redundar&aacute; en una   mejor calidad de vida de los individuos afectados por   neuropat&iacute;as craneales que, muchas veces, se archivan   en el campo de lo idiop&aacute;tico &#40;53-55&#41;.   </font></p>     ]]></body>
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<body><![CDATA[<br>   Aceptado: enero 21 de 2011 </font></p>      ]]></body><back>
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