<?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>1561-2953</journal-id>
<journal-title><![CDATA[Revista Cubana de Endocrinología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Endocrinol]]></abbrev-journal-title>
<issn>1561-2953</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1561-29532012000300014</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Enfoque terapéutico de algunas enfermedades del tiroides en Pediatría]]></article-title>
<article-title xml:lang="en"><![CDATA[Therapeutic approach to some thyroid diseases in pediatrics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Gesen]]></surname>
<given-names><![CDATA[Cecilia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Endocrinología  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>23</volume>
<numero>3</numero>
<fpage>281</fpage>
<lpage>290</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1561-29532012000300014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1561-29532012000300014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1561-29532012000300014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las enfermedades del tiroides ocupan un lugar importante, por su frecuencia y variedad, entre las afecciones endocrinas del niño y el adolescente, y aunque puedan padecer las mismas enfermedades tiroideas del adulto, presentan afecciones específicas de la edad, cuyo diagnóstico y tratamiento adecuado puede prevenir los efectos devastadores e irreversibles que estas pueden producir. Se presenta, con interés de actualizar y establecer consenso, el enfoque terapéutico de algunas tiroidopatías de la infancia, en orden de importancia y frecuencia, como es el nódulo de tiroides, el bocio y el hipertiroidismo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Thyroid diseases hold an important place because of their frequency and variety in the endocrine diseases affecting the child and the adolescent. Although both can suffer the same thyroid diseases as the adults, there are specific illnesses of the age, the diagnosis and treatment of which may prevent the devastating and irreversible effects that they can bring. For the purpose of updating information and reaching a consensus, this paper presented the therapeutic approach to some thyroid diseases of the childhood by order of importance and frequency, such as the thyroid nodule, the goiter and the hyperthyroidism.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[nódulo de tiroides]]></kwd>
<kwd lng="es"><![CDATA[bocio]]></kwd>
<kwd lng="es"><![CDATA[hipertiroidismo]]></kwd>
<kwd lng="en"><![CDATA[thyroid nodule]]></kwd>
<kwd lng="en"><![CDATA[goiter]]></kwd>
<kwd lng="en"><![CDATA[hyperthyroidism]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">  <B>URGENCIAS Y OTRAS SITUACIONES ESPECIALES</B></font></p>    <p>&nbsp;</p>    <p><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b>Enfoque  terap&eacute;utico de algunas enfermedades del tiroides en Pediatr&iacute;a</b></font></p>    <p>&nbsp;</p>    <p><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b><font size="3">Therapeutic  approach to some thyroid diseases in pediatrics</font></b></font></p>    <p>&nbsp;</p>    <p><b></b></p>    <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Dra.  Cecilia P&eacute;rez Gesen</b></font></p><B></B>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Instituto  Nacional de Endocrinolog&iacute;a. La Habana, Cuba. </font>     ]]></body>
<body><![CDATA[<P>&nbsp;     <P>&nbsp;     <P><hr size="1" noshade>      <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>RESUMEN </B>  </font> </p>    <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las  enfermedades del tiroides ocupan un lugar importante, por su frecuencia y variedad,  entre las afecciones endocrinas del ni&ntilde;o y el adolescente, y aunque puedan  padecer las mismas enfermedades tiroideas del adulto, presentan afecciones espec&iacute;ficas  de la edad, cuyo diagn&oacute;stico y tratamiento adecuado puede prevenir los  efectos devastadores e irreversibles que estas pueden producir. Se presenta, con  inter&eacute;s de actualizar y establecer consenso, el enfoque terap&eacute;utico  de algunas tiroidopat&iacute;as de la infancia, en orden de importancia y frecuencia,  como es el n&oacute;dulo de tiroides, el bocio y el hipertiroidismo. </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Palabras clave:</B>  n&oacute;dulo de tiroides, bocio, hipertiroidismo. <hr size="1" noshade></font>      <p>     <p><b><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ABSTRACT</b></font>  </b> </p>    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Thyroid diseases hold an important place  because of their frequency and variety in the endocrine diseases affecting the  child and the adolescent. Although both can suffer the same thyroid diseases as  the adults, there are specific illnesses of the age, the diagnosis and treatment  of which may prevent the devastating and irreversible effects that they can bring.  For the purpose of updating information and reaching a consensus, this paper presented  the therapeutic approach to some thyroid diseases of the childhood by order of  importance and frequency, such as the thyroid nodule, the goiter and the hyperthyroidism.</font></p>    <p><font face="Verdana" size="2"><b>Key  words:</b> thyroid nodule, goiter, hyperthyroidism.</font></p><hr size="1" noshade>      <p>&nbsp;</p>    <p>    <br> </p>    <P>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B><font size="3">INTRODUCCI&Oacute;N</font></B>  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las  enfermedades tiroideas, en la ni&ntilde;ez y la adolescencia, tienen particularidades  que diferencian su diagn&oacute;stico, enfoque y terap&eacute;utica. Estas particularidades  hacen que con frecuencia se pierda el enfoque adecuado para la atenci&oacute;n  de estas afecciones, lo que dificulta el diagn&oacute;stico correcto e impide  el tratamiento oportuno y eficaz.<SUP>1</SUP> </font>     ]]></body>
<body><![CDATA[<P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br>  N&oacute;dulos tiroideos</B> </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los  n&oacute;dulos tiroideos son masas localizadas en el tiroides, de consistencia  distinta al resto de la gl&aacute;ndula.<SUP>2</SUP> Frecuentemente son asintom&aacute;ticos  y pueden presentarse de forma aislada o m&uacute;ltiple, y estar asociados o no  a bocio.<SUP>3</SUP> Aun cuando el n&oacute;dulo tiroideo es poco frecuente en  edades pedi&aacute;tricas (1,5 % o menos),<SUP>4-6</SUP> el riesgo de que sea  maligno es 5 veces mayor que en el adulto.<SUP>7-10 </SUP>Su etiolog&iacute;a  se presenta en el <a href="/img/revistas/end/v23n3/c0114312.gif">cuadro</a>.<SUP>3</SUP>  </font>     <P>    <br> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Conducta  terap&eacute;utica</B> </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Tiroiditis  linfocitaria cr&oacute;nica (TLC): el n&oacute;dulo histol&oacute;gicamente id&eacute;ntico  a un fol&iacute;culo linfoide indica TLC, y se debe evaluar si existe hipotiroidismo  primario para establecer tratamiento con levotiroxina s&oacute;dica (LT4) a dosis  sustitutiva de 1-2 &#181;cg/kg/d&iacute;a.<SUP>3,11</SUP> Ante un n&oacute;dulo  solitario, la extirpaci&oacute;n quir&uacute;rgica es lo pertinente por la alta  prevalencia de c&aacute;ncer asociado.<SUP>11,12</SUP> </font>     <P>     ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Quistes  tiroideos: la citolog&iacute;a con aguja fina (CAF) constituye la primera l&iacute;nea  de tratamiento diagn&oacute;stico y terap&eacute;utico, puede curar un NT qu&iacute;stico  y desaparecerlo por completo en la mitad de los casos,<SUP>13-15</SUP> pero, aquellos  que recurren, suelen tener un tama&ntilde;o superior a 4 cm de di&aacute;metro  y deben reevacuarse con un intervalo de 3 semanas. La recidiva tiene indicaci&oacute;n  de extirpaci&oacute;n quir&uacute;rgica a extensi&oacute;n de lobectom&iacute;a,  que suele ser curativa y no requerir ning&uacute;n tipo de terapia adicional.<SUP>3,10,16</SUP>  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Otros  criterios de indicaci&oacute;n quir&uacute;rgica:<SUP>16</SUP></font>     <blockquote>      <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Tama&ntilde;o  del quiste grande (mayor a 4 cm).    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Antecedentes de irradiaci&oacute;n en cabeza y cuello.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Citolog&iacute;a de c&eacute;lulas epiteliales con alg&uacute;n signo de sospecha  de malignidad.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Sospecha cl&iacute;nica de malignidad.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Si lo desea el paciente. </font> </p></blockquote>    <P>    ]]></body>
<body><![CDATA[<br>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El  tratamiento con tiroxina para prevenir las recidivas no es efectivo. El uso de  agentes esclerosantes (tetraciclina, alcohol y etanol percut&aacute;neo), presentan  resultados bastante controvertidos, y es poca la experiencia en edades pedi&aacute;tricas.<SUP>17</SUP>  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">N&oacute;dulo  coloide: es necesario seguir de cerca a estos pacientes con revisiones peri&oacute;dicas  (ecograf&iacute;a/tirotropina [TSH] semestrales) y repetici&oacute;n seriada de  biopsia a intervalos de 1 a 2 a&ntilde;os.<SUP>18 </SUP>La terapia de supresi&oacute;n  con levotiroxina s&oacute;dica (2-3 &#181;cg/kg/d&iacute;a) ha demostrado que  el tejido tiroideo disminuye de tama&ntilde;o, y si es dependiente de TSH el n&oacute;dulo  debe desaparecer al cabo de 12 meses.<SUP>10</SUP> </font>     <P>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se  considera que la terapia de supresi&oacute;n no ha tenido &eacute;xito, cuando  el n&oacute;dulo contin&uacute;a creciendo, cuando la reducci&oacute;n del tama&ntilde;o  es menor del 50 %, cuando la reducci&oacute;n en la captaci&oacute;n de I&#185;&#178;&#179;  o I&#185;&#179;&#185; es menor del 3 %, y si no hay supresi&oacute;n, se considera  que el n&oacute;dulo es aut&oacute;nomo, y por tanto, requiere su extirpaci&oacute;n  quir&uacute;rgica.<SUP>19</SUP> </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br>  Patrones citol&oacute;gicos proliferativos<SUP>10,20-22</SUP></B> </font>     ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El tratamiento  del c&aacute;ncer de tiroides en los ni&ntilde;os siempre es la extirpaci&oacute;n  quir&uacute;rgica; sin embargo, existe cierto grado de controversia con relaci&oacute;n  con la extensi&oacute;n. En general, se recomienda la tiroidectom&iacute;a total  (TT), porque entre el 60 y el 80 % se encuentra tejido tumoral contralateral.  Una alternativa puede ser la tiroidectom&iacute;a subtotal (TS) con tratamiento  posterior de yodo radioactivo para disminuir las posibles lesiones de nervio lar&iacute;ngeo  y las gl&aacute;ndulas paratiroides. Se ha demostrado un mejor pron&oacute;stico  y menor riesgo de reca&iacute;das.<SUP>20</SUP></font>     <blockquote>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Neoplasias foliculares: se recomienda la extirpaci&oacute;n quir&uacute;rgica  con extensi&oacute;n variable (TT a TS).<SUP>10,21    <br> </SUP></font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Carcinoma diferenciado (papilar o mixto): lesiones &lt; 2 cm lobectom&iacute;a  con istmectom&iacute;a y exploraci&oacute;n de la cadena ganglionar ipsilateral;  lesiones &gt; 2 cm TT con linfadenectom&iacute;a locorregional de los ganglios  cl&iacute;nicamente afectados, sin disecci&oacute;n radical del cuello.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Carcinoma medular: TT y seguimiento evolutivo peri&oacute;dico con calcitonina,  y marcadores tumorales (oncogen RET) a edades tempranas para tratamiento quir&uacute;rgico  precoz.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Carcinoma anapl&aacute;sico: tratamiento paliativo.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Patr&oacute;n citol&oacute;gico sospechoso:<SUP> </SUP>extirpaci&oacute;n quir&uacute;rgica  de extensi&oacute;n variable.<SUP>10    <br> </SUP></font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Patr&oacute;n citol&oacute;gico indeterminado: en aquellos n&oacute;dulos sin  diagn&oacute;stico citol&oacute;gico o indeterminado, clasificados como clase  1, debe buscarse la alternativa ganmagr&aacute;fica y ecograf&iacute;a para la  evaluaci&oacute;n de su tratamiento.<SUP>10,23,24</SUP> </font> </p></blockquote>    <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br> Conducta  seg&uacute;n el resultado de la gammagraf&iacute;a de tiroides:</B> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">- Lesiones nodulares  hipocaptantes (gammagr&aacute;ficamente fr&iacute;os y ecogr&aacute;ficamente  s&oacute;lidos) asociadas a condiciones de riesgo: var&oacute;n, patr&oacute;n  de crecimiento r&aacute;pido y mantenido, mayor de 4 cm la extirpaci&oacute;n  quir&uacute;rgica es el tratamiento&#160; </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Lesiones nodulares hipercaptantes (ganmagr&aacute;ficamente calientes): </font>      <P> <ul>     <li><b></b><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Normofuncionantes  (75 %), se realizar&aacute; vigilancia peri&oacute;dica de 6 a 12 meses con extirpaci&oacute;n  quir&uacute;rgica si en este per&iacute;odo no se modifica, excluyendo las hemiagenesias  tiroideas. </font> </li>    <li><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Hiperfuncionantes  (25 %), siempre tienen indicaci&oacute;n de extirpaci&oacute;n quir&uacute;rgica  con uso previo de antitiroideos de s&iacute;ntesis.<SUP>10,11</SUP> </font> </li>    </ul>    ]]></body>
<body><![CDATA[<P>  <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br> </B></font>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Pautas de tratamiento  y seguimiento en el carcinoma tiroideo<SUP>10,22,25</SUP></B> </font>     <P>     <blockquote>      <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1. TT.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2.  Ablaci&oacute;n con I<SUP>131</SUP> (30-50 mCi) a las 4-6 semanas.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3.  Tratamiento frenador con HT (T4).    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">4.  Seguimiento: cl&iacute;nico, hormonal (TSH), marcadores tumorales (tiroglobulina,  calcitonina) y evaluar las complicaciones del tratamiento. Seguimientos con frecuencia  trimestral durante el 1er. a&ntilde;o, semestral del 2do. al 5to. a&ntilde;o,  y anuales desde este momento.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">5.  Rastreo con I<SUP>131</SUP> con periodicidad semestral el 1er. a&ntilde;o, anuales  entre el 2do. y 5to. a&ntilde;os, y luego cada 3-5 a&ntilde;os. </font> </p></blockquote>    ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br> </B></font>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Bocio en la  infancia</B> </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La  OMS define el bocio como un agrandamiento de los l&oacute;bulos laterales del  tiroides superior al tama&ntilde;o de la falange distal del dedo pulgar del paciente,  lo que supone un aumento de 4 a 5 veces el tama&ntilde;o normal de la gl&aacute;ndula,  o tambi&eacute;n, durante la infancia, la presencia de tiroides palpable.<SUP>26  </SUP>Su clasificaci&oacute;n es<SUP> </SUP>end&eacute;mico o espor&aacute;dico.<SUP>27  </SUP>El origen gen&eacute;tico est&aacute; dado por los defectos enzim&aacute;ticos,  las alteraciones de la tiroglobulina, y la resistencia a HT. El origen adquirido  es el bocio simple (coloide y puberal), el inducido por sustancias boci&oacute;genas,  la enfermedad de Graves Basedow, la tiroiditis de Hashimoto y la subaguda de Quervain.  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La  conducta terap&eacute;utica para el bocio end&eacute;mico es el tratamiento profil&aacute;ctico  (yodaci&oacute;n de la sal), y el sustitutivo con tiroxina, mientras que para  el bocio espor&aacute;dico son:<SUP>28</SUP> </font>     <P>     <blockquote>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A.  Dishormonog&eacute;nesis y alteraciones de la tiroglobulina glucoprote&iacute;na  tiroidea (Tg): tratamiento sustitutivo con levotiroxina s&oacute;dica a las dosis  establecidas seg&uacute;n la edad del ni&ntilde;o.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">B.  S&iacute;ndromes de resistencia a hormonas tiroideas (RHT): generalizada (dosis  suprafisiol&oacute;gicas de HT) e hipofisaria (liotironina o su an&aacute;logo  [TRIAC]), derivado ac&eacute;tico de T3 con poca experiencia de uso en edades  pedi&aacute;tricas.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">C.  Bocio simple coloide: conducta expectante con vigilancia peri&oacute;dica hasta  2 a&ntilde;os, ensayos terap&eacute;uticos con dosis supresivas de levotiroxina  s&oacute;dica con poca respuesta, y tiroidectom&iacute;a subtotal (si hay tendencia  al crecimiento del bocio a pesar de estas medidas o presencia de tejido tiroideo  endotor&aacute;cico).    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">D.  Bocio simple puberal: no existe tratamiento establecido, se recomienda vigilancia  peri&oacute;dica. Regresa espont&aacute;neamente despu&eacute;s de unos a&ntilde;os.  </font> </p></blockquote>    <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br>  Enfermedades inflamatorias del tiroides<SUP>28</SUP> </B> </font>     <P>     <blockquote>      <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1. Tiroiditis de  Hashimoto: en los pacientes eutiroideos, no se recomienda la administraci&oacute;n  de levotiroxina s&oacute;dica. En los casos con hipotiroidismo permanente o transitorio  debe instaurarse tratamiento sustitutivo con LT4 a raz&oacute;n de 1-5 &#181;g/kg/  d&iacute;a.    ]]></body>
<body><![CDATA[<br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2.  Tiroiditis silente: remisi&oacute;n espont&aacute;nea.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3.  Tiroiditis subaguda de Quervain: producida generalmente por virus (coxsackie,  adenovirus, parotiditis e influenza), sin tratamiento espec&iacute;fico. </font>  </p></blockquote>    <P>    <br>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Hipertiroidismo</B>  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se  refiere a las alteraciones del tiroides que determinan una producci&oacute;n aumentada  de hormonas tiroideas (HT). La enfermedad de Graves Basedow es responsable de  m&aacute;s del 90 % de los casos con hipertiroidismo en los ni&ntilde;os, con  un m&aacute;ximo entre los 11 y 15 a&ntilde;os.<SUP>29 </SUP>La conducta terap&eacute;utica<SUP>29-36  </SUP>consta de medidas generales (reposo f&iacute;sico y mental, dieta hipercal&oacute;rica  e hiperproteica y psicoterapia). Las medidas para control inicial de los s&iacute;ntomas  son: </font><font face="Symbol" size="2">b</font><font face="Symbol" size="4">  </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">bloqueantes  (propranolol 2-10 mg/kg/d&iacute;a, con dosis m&aacute;xima de 120 mg por 2 semanas,  contraindicado para el asma bronquial y la insuficiencia card&iacute;aca). </font>      <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Las opciones  terap&eacute;uticas espec&iacute;ficas son la medicaci&oacute;n antitiroidea,  o sea, drogas antitiroideas de s&iacute;ntesis (ATS, tionamidas o tioderivados),<SUP>37  </SUP>el propiltiuracilo (PTU), 5-10 mg/kg/d&iacute;a, con dosis m&aacute;xima  de 300 mg/d cada 8 horas, el metimazol o carbimazol, 0,5-1 mg/kg/d&iacute;a en  dosis &uacute;nica, con un m&aacute;ximo de 30 mg/d, y una duraci&oacute;n de  6 a 8 semanas. Si persistieran los s&iacute;ntomas de hipertiroidismo, aumentar  la dosis a un 50 % de la inicial; y si se produjera un eutiroidismo, reducir un  50 % la dosis y asociar LT4 de 0,1 a 0,2 mg diarios durante 1 a 2 a&ntilde;os.  </font>     <P>     ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los  efectos adversos ocurren entre un 5-32 % de los ni&ntilde;os, son m&aacute;s frecuentes  a dosis altas de metimazol (MTZ), y no hay efectos dosis dependientes con el PTU.  Los m&aacute;s frecuentes son la leucopenia y la agranulocitosis, la hepatitis,  la trombocitopenia, la anemia apl&aacute;stica, el rash urticariano, las artralgias,  la fiebre y los trastornos gastrointestinales;<SUP>38-41 </SUP>mientras que los  m&aacute;s graves son el fen&oacute;meno <I>like lupus</I>, el s&iacute;ndrome  de la insulina autoinmune, la hepatotoxicidad y la hepatitis fulminante por PTU.  No es recomendado su uso en el bocio multinodular y el n&oacute;dulo solitario.  El pico m&aacute;ximo de respuesta a la medicaci&oacute;n se alcanza a las 4-6  semanas. El 30 % de los pacientes pedi&aacute;tricos consiguen remisi&oacute;n  despu&eacute;s de 2 a&ntilde;os de tratamiento.<SUP>30-32</SUP> </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>    <br>  Radioyodo 131<SUP>42-52</SUP></B> </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El  tratamiento con I<SUP>131</SUP> hoy d&iacute;a se considera la primera l&iacute;nea  de tratamiento en el hipertiroidismo (HT). Es la forma posiblemente m&aacute;s  segura y econ&oacute;mica de tratar el HT. El 30 % de los pacientes se cura, y  rara vez los efectos secundarios son graves. Debe usarse a dosis elevadas para  asegurar la destrucci&oacute;n de la gl&aacute;ndula y minimizar el riesgo de  c&aacute;ncer. Si despu&eacute;s 20-24 semanas de tratamiento persiste el hipertiroidismo,  se debe repetir el tratamiento. Actualmente no se considera su uso en &lt; de  5 a&ntilde;os. Es v&aacute;lido se&ntilde;alar que con oftalmopat&iacute;a, puede  empeorar tras el tratamiento, y que existe gran posibilidad de desarrollo de hiperparatiroidismo  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se  indica si hay fracaso del tratamiento con drogas, si se producen recidivas, o  si se dan estas luego del postratamiento quir&uacute;rgico. El c&aacute;lculo  de la dosis se har&aacute; con el empleo de la vida media efectiva y el tama&ntilde;o  del tiroides: </font>     <P><img src="/img/revistas/end/v23n3/fo0114312.gif" width="204" height="52">      <P>    ]]></body>
<body><![CDATA[<br> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Cirug&iacute;a<SUP>29-35,53,54</SUP></B>  </font>     <P>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se  indica en hipertiroidismos que cursan con bocios enormes, multinodulares, o n&oacute;dulos  aut&oacute;nomos de gran tama&ntilde;o. La extensi&oacute;n quir&uacute;rgica  es: tiroidectom&iacute;a subtotal con residuo de 1 a 2 g de tejido, previa aplicaci&oacute;n  de yoduros. Los factores relacionados con peores tasas de remisi&oacute;n son:<SUP>33,55-57</SUP>  </font>     <P>     <blockquote>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Sexo masculino.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Menor edad al diagn&oacute;stico.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Bocio grande.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Prep&uacute;ber.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Menor &iacute;ndice de masa corporal.    ]]></body>
<body><![CDATA[<br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Oftalmopat&iacute;a.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Reca&iacute;da previa.    <br> </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">-  Niveles elevados de tiroxina libre (Ft4) o inmunoglobulina estimulante del tiroides  (TSI). </font> </p></blockquote>    <P>     <P>     <P>&nbsp;     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B><font size="3">REFERENCIAS  BIBLIOGR&Aacute;FICAS</font></B> </font>     <P>     <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1.  Guell R. Pr&oacute;logo. En: Permanyer Publications. Enfermedades del tiroides  en ni&ntilde;os y adolescentes. Barcelona: Permanyer Publications; 1998. p. 1-2.      </font>     ]]></body>
<body><![CDATA[<P>     <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2.  Morten JD, Woolner LB, Bennet WA. Gross and microscopic findings in clinically  hormonal thyroid glands. J Clin Endocrinol Metab. 1955;15:1270-80.     </font>     <P>      <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3. Salas M. N&oacute;dulos  tiroideos. C&aacute;ncer de tiroides. En: Pombo M. editor. Tratado de Endocrinolog&iacute;a  Pedi&aacute;trica. 3ra. ed. Madrid: Mc Graw-Hill; 2002. p. 584-99.     </font>     <P>      <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">4. Mu&ntilde;oz  MT, Argente J. N&oacute;dulo tiroideo y carcinoma de tiroides. En: Argente J,  editor. Tratado de Endocrinolog&iacute;a Pedi&aacute;trica. 2da. edici&oacute;n.  Barcelona: Doyma;1994. p. 539-48.     </font>     <P>     ]]></body>
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