<?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>0121-8123</journal-id>
<journal-title><![CDATA[Revista Colombiana de Reumatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Reumatol.]]></abbrev-journal-title>
<issn>0121-8123</issn>
<publisher>
<publisher-name><![CDATA[Asociaciķn Colombiana de Reumatología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-81232008000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síndrome de Sjögren: revisiķn clínica con énfasis en las manifestaciones dermatolķgicas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz Paúl]]></surname>
<given-names><![CDATA[Silvia Catalina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez Franco]]></surname>
<given-names><![CDATA[Carlos Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pinto Peņaranda]]></surname>
<given-names><![CDATA[Luis Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez]]></surname>
<given-names><![CDATA[Javier Darío]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad CES Hospital Pablo Tobķn Uribe Dermatología]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Pablo Tobķn Uribe Reumatología ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<volume>15</volume>
<numero>1</numero>
<fpage>35</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232008000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El síndrome de Sjögren (SS) es una enfermedad autoinmune sistémica caracterizada por la presencia de xeroftalmía y xerostomía debido a un infiltrado linfoide de las glándulas exocrinas. El SS puede ocurrir aislado (SS primario) o asociado con diferentes enfermedades autoinmunes (SS secundario). Dentro de las glándulas exocrinas las salivares y lagrimales son las más afectadas, desencadenando consecuencias objetivas severas y manifestaciones subjetivas importantes. Como resultado, las manifestaciones cutáneas han sido minimizadas a pesar de ser relativamente frecuentes. Estas manifestaciones van desde xerosis hasta complicaciones por vasculitis. El objetivo de esta revisiķn es delinear los posibles hallazgos en la piel de este síndrome.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Sjögren's syndrome (SS) is a systemic autoimmune disease characterized by xeropthalmia and xerostomia due to lymphocytic infiltrates of exocrine glands. SS may occur alone (primary SS) or in association with several autoimmune diseases (secondary SS). Among exocrine glands the lachrymal and salivary are the foreground, owing the severity of the objective consequences and the importance of the subjective manifestations. As a result, cutaneous manifestations are minimized, albeit relatively common. These manifestations range from drynessness to complications for vasculitis. The objective of this review is to outline the possible skin findings of this syndrome.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[síndrome de Sjögren]]></kwd>
<kwd lng="es"><![CDATA[dermatología]]></kwd>
<kwd lng="es"><![CDATA[piel]]></kwd>
<kwd lng="en"><![CDATA[Sjögren's syndrome]]></kwd>
<kwd lng="en"><![CDATA[dermatology]]></kwd>
<kwd lng="en"><![CDATA[skin]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <title> </title> <head> <body>  <font face="verdana" size=2>REVISI&Oacute;N</font>      <p>    <center><font face="verdana" size=4><b>S&iacute;ndrome de Sj&ouml;gren: revisi&oacute;n cl&iacute;nica con &eacute;nfasis en    <br> las manifestaciones dermatol&oacute;gicas</b></font></center></p>       <p><font face="verdana" size=2>Silvia Catalina D&iacute;az Pa&uacute;l<sup>1</sup>, Carlos Jaime Vel&aacute;squez Franco<sup>2</sup>, Luis Fernando Pinto Pe&ntilde;aranda<sup>2</sup>, Javier Dar&iacute;o M&aacute;rquez<sup>2</sup></font></p>  <sup>1</sup>RIII Dermatolog&iacute;a, Universidad CES. Hospital Pablo Tob&oacute;n Uribe, Medell&iacute;n, Colombia.    <br> <sup>2</sup>Docente Reumatolog&iacute;a HPTU. Hospital Pablo Tob&oacute;n Uribe, Medell&iacute;n, Colombia.    <br>      <p>Recibido para publicaci&oacute;n: noviembre 23/2007. Aceptado en forma revisada: febrero 29/2008</p>  <hr>  <font face="verdana">      <p><b>Resumen</b></p>      <p>El s&iacute;ndrome de Sj&ouml;gren (SS) es una enfermedad autoinmune sist&eacute;mica caracterizada por la presencia de xeroftalm&iacute;a y xerostom&iacute;a debido a un infiltrado linfoide de las gl&aacute;ndulas exocrinas. El SS puede ocurrir aislado (SS primario) o asociado con diferentes enfermedades autoinmunes (SS secundario). Dentro de las gl&aacute;ndulas exocrinas las salivares y lagrimales son las m&aacute;s afectadas, desencadenando consecuencias objetivas severas y manifestaciones subjetivas importantes. Como resultado, las manifestaciones cut&aacute;neas han sido minimizadas a pesar de ser relativamente frecuentes. Estas manifestaciones van desde xerosis hasta complicaciones por vasculitis. El objetivo de esta revisi&oacute;n es delinear los posibles hallazgos en la piel de este s&iacute;ndrome.</p>      ]]></body>
<body><![CDATA[<p><b>Palabras clave</b>: s&iacute;ndrome de Sj&ouml;gren, dermatolog&iacute;a, piel.</p>  <hr>      <p><b>Summary</b></p>      <p>Sj&ouml;gren's syndrome (SS) is a systemic autoimmune disease characterized by xeropthalmia and xerostomia due to lymphocytic infiltrates of exocrine glands. SS may occur alone (primary SS) or in association with several autoimmune diseases (secondary SS). Among exocrine glands the lachrymal and salivary are the foreground, owing the severity of the objective consequences and the importance of the subjective manifestations. As a result, cutaneous manifestations are minimized, albeit relatively common. These manifestations range from drynessness to complications for vasculitis. The objective of this review is to outline the possible skin findings of this syndrome.</p>      <p><b>Key words</b>: Sj&ouml;gren's syndrome, dermatology, skin.</p>  <hr>        <p><b>Historia</p></b>       <p>La primera descripci&oacute;n del SS se atribuye a Johann Mikulicz quien en 1892 public&oacute; el caso de un granjero de 42 a&ntilde;os que present&oacute; un aumento difuso de las gl&aacute;ndula par&oacute;tidas y lagrimales asociado con un infiltrado de c&eacute;lulas redondas peque&ntilde;as<sub>1</sub>. El t&eacute;rmino S&iacute;ndrome de Mikulicz cay&oacute; en desuso porque se refer&iacute;a a m&uacute;ltiples causas de aumento del tama&ntilde;o glandular<sub>3</sub>.</p>      <p>En 1930, el oftalm&oacute;logo suizo Henrik Sj&ouml;gren inform&oacute; hallazgos cl&iacute;nicos y patol&oacute;gicos compatibles con SS en 19 mujeres, 13 con diagn&oacute;stico probable de artritis reumatoide (AR); adem&aacute;s introdujo el t&eacute;rmino queratoconjuntivis sicca para distinguir el ojo seco de este s&iacute;ndrome de la xeroftalm&iacute;a producida por la deficiencia de vitamina A<sub>3</sub>.</p>      <p>En 1953 Morgan y Castleman<sup>4</sup> presentaron un caso de un paciente con SS en una conferencia cl&iacute;nica-patol&oacute;gica y despertaron de nuevo el inter&eacute;s en esta condici&oacute;n. Pero fue hasta 1956 que Bloch et al.<sup>5</sup> reconocieron la forma florida del SS.</p>      <p><b>Epidemiolog&iacute;a</b></p>      <p>El SS primario es la forma de presentaci&oacute;n en el 50% de los pacientes, tiene una prevalencia aproximada de 0.5-1% en la poblaci&oacute;n general, siendo la segunda enfermedad inflamatoria m&aacute;s frecuente despu&eacute;s de la AR, sin contar con que un porcentaje alto de los casos pasa desapercibido; el SS es nueve veces m&aacute;s frecuente en mujeres que en hombres y tiene dos picos de presentaci&oacute;n: el primero en la tercera d&eacute;cada de la vida y el segundo luego de la menopausia durante la quinta<sup>6,7</sup>.</p>      ]]></body>
<body><![CDATA[<p>El SS secundario es m&aacute;s frecuente asociado a AR, entidad a la que se sobrepone entre el 20 y el 50% de los casos; tambi&eacute;n puede encontrarse asociado a lupus eritematoso sist&eacute;mico (LES), esclerosis sist&eacute;mica progresiva (ESS), cirrosis biliar primaria (CBP) y dermatomiositis (DM)<sup>8</sup>.</p>      <p><b>Criterios diagn&oacute;sticos</b></p>      <p>Hasta hace poco exist&iacute;an m&uacute;ltiples propuestas de criterios diagn&oacute;sticos para el SS primario; la discrepancia entre las mismas conduc&iacute;a a confusi&oacute;n en la pr&aacute;ctica cl&iacute;nica y en la investigaci&oacute;n. Los criterios de uso actual son los del "European American Consensus Group Modification of the Community Criteria for SS" (<a href="tab1">Tabla 1</a>).</p>  <a name="tab1"></a><img src="img/revistas/rcre/v15n1/v15n1a04t1.gif">      <p>Para el diagn&oacute;stico de SS primario se requieren cuatro de seis criterios, incluyendo la biopsia de gl&aacute;ndula salival menor o los anticuerpos Anti SS-A/SS-B. Los criterios de exclusi&oacute;n para el diagn&oacute;stico de SS son: antecedente de radioterapia para linfoma de cabeza y cuello, sarcoidosis, infecci&oacute;n por virus hepatitis C (VHC), s&iacute;ndrome de inmunodeficiencia adquirida (SIDA), enfermedad injerto vs hu&eacute;sped y medicamentos anticolin&eacute;rgicos.</p>      <p>El diagn&oacute;stico del SS secundario no ha sido unificado todav&iacute;a por el European American Consensus Group Modification of the Community Criteria for SS.</p>      <p><b>Anatom&iacute;a patol&oacute;gica</b></p>      <p>La toma de la biopsia de gl&aacute;ndulas salivares menores se debe hacer bajo ciertas normas t&eacute;cnicas para obtener una muestra adecuada y evitar la lesi&oacute;n de las fibras que inervan el labio inferior. La muestra no debe ser tomada de un sitio de la mucosa oral que se encuentre inflamado ya que podr&iacute;a dar un reporte falsamente positivo. En general la muestra se obtiene del labio inferior a un lado de la l&iacute;nea media, previa infiltraci&oacute;n con Xyloca&iacute;na se procede a realizar una incisi&oacute;n en sentido vertical, luego se disecan las gl&aacute;ndulas salivales menores y con una tijera se toman cinco l&oacute;bulos glandulares. La herida se sutura con seda o con materiales absorbibles<sup>9</sup>.</p>      <p>Los aspectos fundamentales al momento de analizar la biopsia incluyen una adecuada cantidad de l&oacute;bulos (m&iacute;nimo cuatro) y la determinaci&oacute;n del focus score (FS) (<a href="tab2">Tabla 2</a>) mediante el conteo de agregados de por lo menos 50 linfocitos e histiocitos por 4 mm˛ de tejido glandular. Un resultado positivo es determinado por la presencia de sialoadenitis focal con m&iacute;nimo un agregado de linfocitos<sup>10</sup>.</p>  <a name="tab2"></a><img src="img/revistas/rcre/v15n1/v15n1a04t2.gif">      <p>La mayor&iacute;a de pat&oacute;logos no tienen experiencia en leer este tipo de biopsias; as&iacute; lo demuestra un estudio11 en el que 50% de biopsias clasificadas como SS fueron reclasificadas cuando las examin&oacute; un pat&oacute;logo experimentado. En la <a href="fig1">Figura 1</a>, se muestra un ejemplo de biopsia de gl&aacute;ndula salival con focus score de cero a tres.</p>  <a name="fig1"></a><img src="img/revistas/rcre/v15n1/v15n1a04f1.jpg">      <p><b>Inmunolog&iacute;a y gen&eacute;tica</b></p>      ]]></body>
<body><![CDATA[<p>Adem&aacute;s de los hallazgos histol&oacute;gicos, manifestaciones como el factor reumatoide, los anticuerpos antinucleares, la hipergamaglobulinemia policlonal y autoanticuerpos como anti SSA/Ro y anti SSB/La son claros indicadores del car&aacute;cter autoinmune del SS<sup>12,13</sup>.</p>      <p>Los autoanticuerpos contra el Ro y el La son marcadores de manifestaciones extraglandulares, en especial vasculitis. La presencia de estos anticuerpos se asocia con diferentes HLA-DR<sup>14,15</sup>.</p>      <p>Aproximadamente el 60% de los pacientes con SS primario expresan anticuerpos Anti SS-A y por lo menos la mitad de estos pacientes expresan Anti SS-B. Es poco com&uacute;n expresar Anti SS-B en ausencia de Anti SS-A<sup>16-18</sup>.</p>      <p><b>Patog&eacute;nesis</b></p>      <p>A pesar de los m&uacute;ltiples estudios realizados la patog&eacute;nesis de este s&iacute;ndrome es desconocida<sup>9</sup>. Se considera que el SS es una enfermedad multifactorial en la que interact&uacute;an factores ambientales que desencadenan la inflamaci&oacute;n en individuos gen&eacute;ticamente predispuestos. Este proceso comprende diferentes pasos.</p>  <ol>      <li>El paso inicial se cree que corresponde a defectos intr&iacute;nsecos de las c&eacute;lulas del epitelio glandular y de las c&eacute;lulas dendr&iacute;ticas que llevan a un proceso de apoptosis anormal lo que genera productos apopt&oacute;ticos y a la expresi&oacute;n de ep&iacute;topes cr&iacute;pticos<sup>19</sup>.</li>      <li>Luego factores ambientales como procesos virales e infecciones recurrentes estimulan a las c&eacute;lulas glandulares y dendr&iacute;ticas a activar el sistema de inmunidad innata por medio del HLA; este sistema usa receptores Toll para reconocer patrones moleculares que son compartidos por los microorganismos causantes de estas infecciones y por los productos apopt&oacute;ticos lo que conlleva a respuesta contra ant&iacute;genos propios debido a un "error inmune por mimetismo molecular"<sup>20</sup>.</li>      <li>Estos cambios conducen a la liberaci&oacute;n de citoquinas que regulan de forma positiva la migraci&oacute;n de linfocitos y c&eacute;lulas dendr&iacute;ticas hacia el tejido glandular<sup>21</sup>.</li>      <li>La activaci&oacute;n de los linfocitos B y T ocurre como consecuencia de la presentaci&oacute;n de ant&iacute;genos mediante el HLA-DR y otras mol&eacute;culas coestimulatorias, lo que perpet&uacute;a la respuesta inmune con linfocitos de memoria, interfer&oacute;n tipo I y autoanticuerpos<sup>22</sup>.</li>      <li>Se cree que la destrucci&oacute;n glandular ocurre mediante mecanismos perforina/granzyma-A y Fas/ Fas ligando23. Esta destrucci&oacute;n es parcial, pero la producci&oacute;n local de citoquinas, autoanticuerpos y metaloproteinasas conduce a disfunci&oacute;n del tejido glandular residual<sup>24</sup>.</li>    ]]></body>
<body><![CDATA[</ol>      <p><b>Manifestaciones cut&aacute;neas</b></p>      <p>El compromiso cut&aacute;neo se observa al menos en la mitad de los pacientes con diagn&oacute;stico de SS<sup>25</sup>; las lesiones pueden ser divididas en vascul&iacute;ticas y no vascul&iacute;ticas<sup>26-55</sup> (<a href="tab3">Tabla 3</a>).</p>      <p><a name="tab3"></a><img src="img/revistas/rcre/v15n1/v15n1a04t3.gif"></p>      <p>La p&uacute;rpura hipergammaglobulin&eacute;mica se presenta en 15% de los pacientes con SS<sup>8</sup>, se manifiesta con lesiones no palpables de coloraci&oacute;n ocre o viol&aacute;cea de bordes serpiginosos y que al resolver dejan hiperpigmentaci&oacute;n residual; puede acompa&ntilde;arse de neuropat&iacute;a perif&eacute;rica<sup>56</sup> y est&aacute; frecuentemente asociada a la presencia de t&iacute;tulos altos factor reumatoide (especialmente el subtipo IgM) y crioglobulinas<sup>57,58</sup>. La electroforesis de prote&iacute;nas muestra hipergamaglobulinemia policlonal y la biopsia de piel muestra ruptura de los vasos sangu&iacute;neos y dep&oacute;sito de complemento.</p>      <p>La vasculitis leucocitocl&aacute;stica (<a href="#fig1">Figura 2</a>) se presenta en 11% de los pacientes con SS<sup>8</sup>, su principal manifestaci&oacute;n es la p&uacute;rpura palpable, tambi&eacute;n puede presentarse como petequias o equimosis diseminadas<sup>51</sup>. La morfolog&iacute;a de las lesiones depende del tipo de vaso comprometido. La implicaci&oacute;n pron&oacute;stica de esta manifestaci&oacute;n fue descrita por Ioannidis y col.<sup>49</sup> quien report&oacute;</p>      <p><a name="fig2"></a><img src="img/revistas/rcre/v15n1/v15n1a04f2.jpg"></p>       <p>un grupo de 723 pacientes a quienes sigui&oacute; durante 20 a&ntilde;os, en el cual encontr&oacute; dos subtipos de pacientes: el tipo I cuyos pacientes debutaban con p&uacute;rpura palpable, hipocomplementemia a expensas de C4 y con el tiempo ten&iacute;an mayor probabilidad de presentar compromiso del sistema nervioso central o pulmonar; en oposici&oacute;n en el tipo II los pacientes presentaban un curso cl&iacute;nico no complicado.</p>      <p>La urticaria vascul&iacute;tica (<a href="#fig3">Figura 3</a>) es la forma de presentaci&oacute;n en 21% de los pacientes con vasculitis<sup>9</sup>, su principal diferencia con la urticaria convencional radica en el tiempo de duraci&oacute;n de los habones (mayor a 24 horas), en la presencia de dolor y ardor m&aacute;s que prurito y de hiperpigmentaci&oacute;n postinflamatoria. La histopatolog&iacute;a muestra una vasculitis leucocitocl&aacute;stica cl&aacute;sica con necrosis fibrinoide de la pared del vaso o un patr&oacute;n de infiltrado linfoide, adem&aacute;s edema de la dermis profunda<sup>31</sup>.</p>      <p><a name="fig3"></a><img src="img/revistas/rcre/v15n1/v15n1a04f3.jpg"></p>       ]]></body>
<body><![CDATA[<p>La xerosis es la manifestaci&oacute;n m&aacute;s importante del SS; se presenta hasta en 66% de los pacientes<sup>8</sup>, los s&iacute;ntomas cl&aacute;sicos de esta patolog&iacute;a son inespec&iacute;ficos, pero se asocian a signos objetivos como piel &aacute;spera, inel&aacute;stica y descamativa. Las gl&aacute;ndulas seb&aacute;ceas constituyen la principal fuente humectante de la piel; sin embargo, las gl&aacute;ndulas sudor&iacute;paras parecen estar implicadas debido al papel homeost&aacute;tico de los lactatos presentes en el sudor<sup>51</sup>. Katayama y col.<sup>37</sup> evaluaron la capacidad de sudoraci&oacute;n en 49 sujetos con SS y encontraron una reducci&oacute;n estad&iacute;sticamente significativa de la tasa de sudoraci&oacute;n de estos sujetos frente a controles sanos. Adem&aacute;s de la franca disminuci&oacute;n en la cantidad del sebo<sup>27,34-36</sup> existe la posibilidad de producci&oacute;n de sebo anormal<sup>33,39-41</sup>; esto explicar&iacute;a la presencia de pelo seco y deslustrado y de descamaci&oacute;n y prurito del conducto auditivo externo (por la disminuci&oacute;n de cerumen) en estos pacientes.</p>      <p>Otro hallazgo interesante es la presencia de dep&oacute;sitos intercelulares de IgG en la epidermis en 66% de los pacientes con SS primario y solo en 13% de los pacientes con SS secundario. Dos hip&oacute;tesis han sido propuestas para explicar este fen&oacute;meno: la primera sugiere que la presencia de IgG intercelular sea secundaria a la presencia de complejos inmunes en esta misma localizaci&oacute;n, pero esto es improbable dada la ausencia de signos histopatol&oacute;gicos de inflamaci&oacute;n a este nivel; la segunda hip&oacute;tesis sugiere que la IgG se encuentra en esta localizaci&oacute;n unida a receptores de la c&eacute;lulas de Langerhans<sup>30,59</sup>. Velthius y col.<sup>60</sup> resaltaron la asociaci&oacute;n entre los dep&oacute;sitos de IgG y la presencia de Anti SS-A/SS-B circulantes.</p>        <p>Entre los pacientes asi&aacute;ticos con SS, el eritema anular (<a href="#fig4">Figura 4</a>) ha sido informado en una proporci&oacute;n significativa<sup>43,44</sup>; se presenta como una placa eritematoedematosa de borde elevado y centro p&aacute;lido en la cara; los hallazgos histopatol&oacute;gicos incluyen edema marcado de la dermis superior e infiltrado linfoc&iacute;tico perivascular y entre los haces de col&aacute;geno<sup>42</sup>. A diferencia de las lesiones del lupus cut&aacute;neo subagudo, en estas lesiones no se observa dep&oacute;sito de IgG a lo largo de la membrana basal.</p>      <p><a name="fig4"></a><img src="img/revistas/rcre/v15n1/v15n1a04f4.jpg"></p>       <p>El linfoma cut&aacute;neo de c&eacute;lulas B (<a href="#fig5">Figura 5</a>) es la complicaci&oacute;n m&aacute;s temida de los pacientes con SS primario, la incidencia exacta de esta patolog&iacute;a se desconoce debido a que la mayor&iacute;a de estudios existentes son cohortes de peque&ntilde;o tama&ntilde;o. El riesgo de desarrollar linfomas no Hogkin en pacientes con SS primario o secundario fue estimado por Kassan y col.<sup>46</sup> quienes observaron un riesgo <sup>44</sup> veces mayor en estos pacientes, comparados con poblaci&oacute;n normal. Se debe sospechar un linfoma de c&eacute;lulas B en pacientes con adenomegalias, infiltrados pulmonares nodulares, crecimiento parot&iacute;deo persistente y asim&eacute;trico, pico monoclonal u oligoclonal en la electroforesis de prote&iacute;nas y negativizaci&oacute;n del factor reumatoide. Resultados similares han sido informados por otros autores<sup>47-49</sup>.</p>      <p><a name="fig5"></a><img src="img/revistas/rcre/v15n1/v15n1a04f5.jpg"></p>       <p>Otras manifestaciones no vascul&iacute;ticas informadas han sido: alopecia<sup>35,50</sup>, vit&iacute;ligo<sup>35,51</sup>, anetoderma<sup>51</sup>, amiloidosis nodular<sup>52,53</sup>, s&iacute;ndrome Sweet<sup>26,51,54</sup>, l&iacute;quen plano<sup>51,55</sup>.</p>      <p><b>Manifestaciones oculares</b></p>      <p>El principal hallazgo oftalmol&oacute;gico en pacientes con SS es la queratoconjuntivitis sicca (<a href="#fig6">Figura 6</a>) secundaria a la destrucci&oacute;n de las gl&aacute;ndulas lagrimales. A pesar que el ojo seco es una manifestaci&oacute;n prominente, muchos de los pacientes no est&aacute;n al tanto de los s&iacute;ntomas con los que se presenta. As&iacute; mismo el m&eacute;dico al evaluar el paciente debe determinar signos objetivos usando m&eacute;todos para verificar la integridad de la superficie corneal y la producci&oacute;n de l&aacute;grimas (<a href="#tab4">Tabla 4</a>).</p>      <p><a name="fig6"></a><img src="img/revistas/rcre/v15n1/v15n1a04f6.jpg"></p>      ]]></body>
<body><![CDATA[<p><a name="tab4"></a><img src="img/revistas/rcre/v15n1/v15n1a04t4.gif"></p>      <p>Las tintas vitales como el Rosa de Bengala, la fluoresce&iacute;na y el verde de lissamina son &uacute;tiles para detectar erosiones epiteliales en la c&oacute;rnea y c&eacute;lulas mucosas desvitalizadas en la superficie conjuntival.</p>      <p>En el test de Schirmer, se coloca una tirilla de papel de filtro en el saco conjuntival inferior de ambos ojos del paciente, se pide al paciente que mantenga los ojos cerrados durante 5 minutos y posteriormente se mide la migraci&oacute;n de las l&aacute;grimas sobre el papel: un paciente joven y sano humedece al papel unos 15 mm mientras que un paciente con SS humedece el papel menos de 5 mm. La sensibilidad y la reproducibilidad del test de Schirmer son bastante bajas. Todo paciente con SS requiere una evaluaci&oacute;n oftalmol&oacute;gica peri&oacute;dica<sup>61</sup>.</p>      <p>En el diagn&oacute;stico diferencial de las queratoconjuntivitis sicca hay que tener en cuenta algunas entidades como las blefaritis, queratitis herp&eacute;tica, conjuntivitis, blefaroespasmo, sarcoidosis, infecciones por VIH y virus de la hepatitis C, hipotiroidismo, estados hipoestrog&eacute;nicos, hipotiroidismo y uve&iacute;tis anterior. Tambi&eacute;n es importante que los s&iacute;ntomas de ojo seco se exacerban con medicamentos anticolin&eacute;rgicos, la ansiedad y la depresi&oacute;n<sup>62</sup>.</p>      <p><b>Manifestaciones orales</b></p>      <p>En contraste con la queratoconjuntivitis sicca los pacientes refieren de forma directa los s&iacute;ntomas asociados a xerostom&iacute;a y el m&eacute;dico puede identificar con la inspecci&oacute;n general algunos de los signos objetivos (<a href="#tab5">Tabla 5</a> y <a href="#fig7">Figura 7</a>).</p>      <p><a name="tab5"></a><img src="img/revistas/rcre/v15n1/v15n1a04t5.gif"></p>      <p><a name="fig7"></a><img src="img/revistas/rcre/v15n1/v15n1a04f7.jpg"></p>      <p>La saliva cumple papel en la degluci&oacute;n mec&aacute;nica de los alimentos y en la protecci&oacute;n antimicrobiana; es por esto que los pacientes con SS tienen un mayor riesgo de enfermedad periodontal e infecciones mucosas como la candidiasis (<a href="#fig7">Figura 8</a>)<sup>9</sup>.</p>      <p><a name="fig8"></a><img src="img/revistas/rcre/v15n1/v15n1a04f8.jpg"></p>       ]]></body>
<body><![CDATA[<p>Existen diversos m&eacute;todos para la evaluaci&oacute;n de los pacientes con compromiso oral: la sialometr&iacute;a cuantifica el flujo de saliva durante 15 minutos<sup>63</sup>; la sialograf&iacute;a parotidea eval&uacute;a la distorsi&oacute;n de los ductos salivales y la gamagraf&iacute;a salival puede mostrar disminuci&oacute;n en la captaci&oacute;n del trazador<sup>65</sup>. Otras ayudas diagn&oacute;sticas importantes en el diagn&oacute;stico diferencial del SS son la tomograf&iacute;a computarizada de alta resoluci&oacute;n, la resonancia magn&eacute;tica con sustracci&oacute;n de tejido adiposo y la ecograf&iacute;a parot&iacute;dea en manos experimentadas<sup>64,66</sup>. La biopsia de par&oacute;tida se descart&oacute; por el alto riesgo de f&iacute;stulas sialocut&aacute;neas. En caso de sospecha de linfoma de par&oacute;tida se debe hacer resecci&oacute;n biopsia de la gl&aacute;ndula.</p>      <p>Un factor adicional en estos pacientes es la presencia de reflujo gastroesof&aacute;gico (RGE) e incluso reflujo traqueal que puede simular infecciones respiratorias. Por lo tanto se recomienda medidas rigurosas para prevenir y tratar el RGE en estos pacientes<sup>67</sup>.</p>      <p><b>Manifestaciones sist&eacute;micas</b></p>      <p>La enfermedad extraglandular (<a href="#tab6">Tabla 6</a>) se subdivide en no visceral (sistema m&uacute;sculo-esquel&eacute;tico) y en visceral (pulm&oacute;n, coraz&oacute;n, tracto gastrointestinal, ri&ntilde;&oacute;n, sistema nervioso, endocrino y hematol&oacute;gico).</p>      <p><a name="tab6"></a><img src="img/revistas/rcre/v15n1/v15n1a04t6.gif"></p>      <p>La presentaci&oacute;n de artralgias/artritis en los pacientes con SS es similar a la de los pacientes con diagn&oacute;stico de LES<sup>70,71</sup>. Las mialgias y otros s&iacute;ntomas de debilidad muscular pueden presentarse en estos pacientes de forma aislada o en asociaci&oacute;n con polimiositis, polimialgia reum&aacute;tica, miositis por cuerpos de inclusi&oacute;n, miopat&iacute;a por corticoesteroides, procesos paranopl&aacute;sicos o fibromialgia<sup>72,73</sup>.</p>      <p>La neumonitis intersticial y la xerotr&aacute;quea constituyen las manifestaciones pulmonares m&aacute;s frecuentes del SS<sup>74</sup>. En la clasificaci&oacute;n de la neumonitis intersticial se reconocen varios subtipos: neumonitis intersticial linfoc&iacute;tica, bronquiolitis obliterans, neumon&iacute;a organizada y neumonitis no espec&iacute;fica. Es importante descartar otras causas de infiltrados intersticiales como: toxicidad o hipersensibilidad por metotrexate, infliximab o rituximab e infecciones oportunistas<sup>75-77</sup>.</p>      <p>Dentro de las manifestaciones cardiovasculares las m&aacute;s comunes son la pericarditis y la hipertensi&oacute;n pulmonar<sup>68</sup>; sin embargo, estos pacientes pueden presentar otras alteraciones que sugieren presencia de neuropat&iacute;a auton&oacute;mica en respuesta a m&uacute;ltiples est&iacute;mulos<sup>78</sup>.</p>      <p>Las manifestaciones renales incluyen la nefritis intersticial, la acidosis tubular renal, la par&aacute;lisis hipocal&eacute;mica, los c&aacute;lculos renales y la osteomalacia<sup>79-81</sup>. Si se presenta deterioro s&uacute;bito de la funci&oacute;n renal, debe prestarse especial cuidado al uso de antiinflamatorios no esteroideos (AINES) y hierbas chinas<sup>82</sup>. El desarrollo de glomerulonefritis (GMN) puede sugerir amiloidosis, enfermedad por dep&oacute;sito de complejos inmunes o LES<sup>83</sup>. Se pueden presentar s&iacute;ntomas vesicales severos que se exacerban por el consumo exagerado de l&iacute;quidos t&iacute;pico de estos pacientes<sup>84</sup>.</p>      <p>La disfagia en los pacientes con SS se debe en parte a la xerostom&iacute;a y en parte a la dismotilidad esof&aacute;gica. Los pacientes con s&iacute;ntomas de gastritis se deben examinar en busca de <i>Helicobacter pylori</i> ya que este agente ha sido asociado con linfomas MALT en los pacientes con SS<sup>85</sup>.</p>      ]]></body>
<body><![CDATA[<p>Los pacientes con SS tienen una posibilidad 40 veces mayor de presentar linfomas que la poblaci&oacute;n general<sup>86</sup>. La mayor&iacute;a de linfomas que se presentan son linfomas de c&eacute;lulas B de la zona marginal. La presencia de par&oacute;tidas persistentemente inflamadas, linfadenopat&iacute;as, hepatoesplenomegalia, infiltrados pulmonares, vasculitis o hipergammaglobulinemia; asociadas a ca&iacute;da del hematocrito, velocidad de sedimentaci&oacute;n globular (VSG) elevada o crioglobulinas monoclonales debe despertar sospecha de linfoma en estos pacientes<sup>9</sup>.</p>      <p>Las manifestaciones neurol&oacute;gicas han sido informadas en 20% de estos pacientes; las neuropat&iacute;as perif&eacute;ricas son las m&aacute;s frecuentes, seguidas por neuropat&iacute;as craneales y enfermedades desmielinizantes del sistema nervioso central<sup>87</sup>. Tambi&eacute;n han sido descritos cuadros psiqui&aacute;tricos que preceden el diagn&oacute;stico de la enfermedad autoinmune<sup>88</sup>, y cambios en la funci&oacute;n cognitiva con mala memoria y falta de concentraci&oacute;n<sup>89</sup>.</p>      <p><b>Diagn&oacute;stico diferencial</b></p>      <p>Es crucial diferenciar el SS de otras enfermedades autoinmunes. El &aacute;rea m&aacute;s com&uacute;n de confusi&oacute;n es con el LES. La sobreposici&oacute;n m&aacute;s frecuente se presenta en los pacientes con LES sin GMN pero con artritis y erupciones cut&aacute;neas; estos individuos frecuentemente expresan HLA-DR3 y anticuerpos Anti SS-A.<sup>9</sup>; se debe sospechar LES de base en pacientes con s&iacute;ndrome seco y artropat&iacute;a tipo Jaccoud, erupciones caracter&iacute;sticas y proteinuria importante. Es particularmente dif&iacute;cil el diagn&oacute;stico diferencial entre LES y s&iacute;ndrome de Sj&ouml;gren en ancianos ya que la primera cursa con xerostom&iacute;a y xeroftalm&iacute;a en este grupo etario, adem&aacute;s de menor frecuencia de nefropat&iacute;a y mayor frecuencia de enfermedad pulmonar intersticial; en esta situaci&oacute;n es importante el an&aacute;lisis completo de autoanticuerpos.</p>      <p>La sobreposici&oacute;n cl&iacute;nica con esclerodermia sist&eacute;mica y la asociaci&oacute;n con AR es considerable; sin embargo, existen diferencias en los patrones de anticuerpos, la presentaci&oacute;n cl&iacute;nica, los HLA asociados y las biopsias de tejidos que permiten diferenciarlos; en estas dos entidades la histolog&iacute;a predominante es la atrofia glandular<sub>9</sub>.</p>      <p>Existen otras enfermedades sist&eacute;micas que pueden imitar el SS al causar edema glandular y sequedad; estas deben ser descartadas mediante los paracl&iacute;nicos necesarios (<a href="#tab7">Tabla 7</a>).</p>      <p><a name="tab7"></a><img src="img/revistas/rcre/v15n1/v15n1a04t7.gif"></p>       <p><b>Tratamiento</b></p>      <p><b>Terapia cut&aacute;nea</b></p>      <p>El manejo de la xerosis es similar al instaurado en otras condiciones:</p>  <ul>     ]]></body>
<body><![CDATA[<li>Aplicar humectante libre de fragancia m&iacute;nimo dos veces el d&iacute;a; debe ser aplicado despu&eacute;s del ba&ntilde;o sobre la piel h&uacute;meda para evitar la evaporaci&oacute;n de agua de la piel.</li>     <li>Deben evitarse los ba&ntilde;os largos con agua caliente y los limpiadores con fragancias fuertes.</li>     <li>Si hay prurito se deben aplicar t&oacute;picos con pramoxina, lidoca&iacute;na o mentol. Los antihistam&iacute;nicos orales deben ser usados con precauci&oacute;n debido a su efecto anticolin&eacute;rgico.</li>     <li>Se recomienda el uso diario de protector solar (filtros f&iacute;sicos) en las zonas que no cubre la ropa; sin embargo, la protecci&oacute;n solar m&aacute;s efectiva radica en el uso de prendas con UPF (factor de protecci&oacute;n ultravioleta) y en evitar la exposici&oacute;n solar directa entre las 10 AM y las 2 PM.</li>    </ul>      <p>Con respecto al manejo de las manifestaciones vascul&iacute;ticas cabe anotar:</p>  <ul>     <li>El tratamiento de la p&uacute;rpura hipergammaglobulin&eacute;mica se realiza con Hidroxicloroquina (5-7 mg/kg) ya que ayuda a disminuir la hiperglobulinemia y el desarrollo subsecuente de neuropat&iacute;a. El uso concomitante de altas dosis de corticosteroides y otros inmunosupresores depender&aacute; de la gravedad el caso<sup>25</sup>.</li>     <li>El tratamiento de los pacientes con vasculitis leucocitocl&aacute;stica debe ser m&aacute;s agresivo requiriendo dosis altas de corticoides o incluso ciclofosfamida<sup>29</sup>.</li>    </ul>      <p><b>Terapia ocular</b></p>     ]]></body>
<body><![CDATA[<p><b>Lubricantes</b></p>  <ul>     <li>L&aacute;grimas artificiales libres de preservativos, m&iacute;nimo tres veces al d&iacute;a y preferiblemente cada 30 a 60 minutos.</li>     <li>Ung&uulm;entos lubricantes y metilcelulosa en la noche.</li>     <li>Escudos laterales para el marco de las gafas para reducir la evaporaci&oacute;n de las l&aacute;grimas; las gafas de nataci&oacute;n son bastante eficaces para disminuir la evaporaci&oacute;n, pero las consideraciones sociales limitan su uso.</li>     <li>Uso de humidificadores en la habitaci&oacute;n del paciente.</li>    </ul>      <p>Oclusi&oacute;n del punto lagrimal inferior</p>  <ul>      <li>Es el tratamiento de elecci&oacute;n debido a que 90% de las l&aacute;grimas drenan por este punto; existen m&uacute;ltiples tapones; los intracanaliculares no protuyen a la superficie corneal, raz&oacute;n por la cual son preferidos sobre los otros<sup>90</sup>.</li>    </ul>      <p><b>Gotas oft&aacute;lmicas</b></p>  <ul>    ]]></body>
<body><![CDATA[<li>Para casos de xeroftalm&iacute;a grave se recomienda la Ciclosporina emulsi&oacute;n 0,05% con m&uacute;ltiples estudios que soportan su uso<sup>2,4,91</sup>; los s&iacute;ntomas se resuelven hacia el tercer mes de uso y su efecto adverso m&aacute;s frecuente es el ardor local; no se han descrito complicaciones sist&eacute;micas de la Ciclosporina en esta forma de administraci&oacute;n.</li>      <li>Tacr&oacute;limus en suspensi&oacute;n al 0,02%, puede ser ben&eacute;fico en pacientes con respuesta inadecuada a la cilosporina t&oacute;pica<sup>92</sup>.</li>    </ul>      <p><b>Terapia sist&eacute;mica</b></p>  <ul>    <li>La complicaci&oacute;n m&aacute;s preocupante del compromiso de la mucosa oral es la p&eacute;rdida dental, por eso es de extrema importancia el uso de seda dental luego de cada comida al igual que asistir al odont&oacute;logo para tratamientos de higiene dental y fl&uacute;or m&iacute;nimo cada tres meses<sup>93</sup>.</li>      <li>Los sustitutos de saliva son una opci&oacute;n para estos pacientes; sin embargo, suelen ser mal tolerados<sup>94</sup>.</li>      <li>En los pacientes con s&iacute;ntomas persistentes est&aacute; indicado el tratamiento con secretagogos que estimulan los receptores muscar&iacute;nicos; hay dos agentes disponibles: la pilocarpina y la cevimelina. Ambos han demostrado en estudios cl&iacute;nicos controlados<sup>94-96</sup> incrementos significativos en la tasa de salivaci&oacute;n (<a href="#tab8">Tabla 8</a>).</li>      <p><a name="tab8"></a><img src="img/revistas/rcre/v15n1/v15n1a04t8.gif"></p>      <li>Las manifestaciones articulares pueden manejarse con antiinflamatorios no esteroides, dosis baja de prednisolona y antimal&aacute;ricos; en casos resistentes a este manejo se puede utilizar el metotrexate por per&iacute;odos cortos para evitar el riesgo de neoplasia que confiere este medicamento en una entidad que de por s&iacute; cursa con un mayor riesgo de linfomas; ninguna de estas conductas tiene respaldo de un ensayo cl&iacute;nico controlado.</li>      <li>Para casos graves de s&iacute;ndrome de Sj&ouml;gren, con manifestaciones vascul&iacute;ticas, parotidomegalia persistente, pseudolinfomas o linfomas se describe el uso de Rituximab<sup>97</sup>.</li>      ]]></body>
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