<?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>1698-4447</journal-id>
<journal-title><![CDATA[Medicina Oral, Patología Oral y Cirugía Bucal (Ed. impresa)]]></journal-title>
<abbrev-journal-title><![CDATA[Med. oral patol. oral cir. bucal (Ed.impr.)]]></abbrev-journal-title>
<issn>1698-4447</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Española de Medicina Oral]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1698-44472005000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Valor predictivo de la candidiasis oral como marcador de evolución a SIDA]]></article-title>
<article-title xml:lang="en"><![CDATA[Predictive value of oral candidiasis as a marker of progression to AIDS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Feijoo]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diz Dios]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Otero Cepeda]]></surname>
<given-names><![CDATA[Xosé Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Limeres Posse]]></surname>
<given-names><![CDATA[Jacobo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[la Fuente Aguado]]></surname>
<given-names><![CDATA[Javier de]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocampo Hermida]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Santiago de Compostela Facultad de Medicina y Odontología Departamento de Estomatología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Santiago de Compostela Facultad de Matemáticas Departamento de Estadística e Investigación Operativa]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Xeral-Cíes Servicio de Medicina Interna Unidad de Enfermedades Infecciosas]]></institution>
<addr-line><![CDATA[Vigo ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2005</year>
</pub-date>
<volume>10</volume>
<numero>1</numero>
<fpage>32</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1698-44472005000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1698-44472005000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1698-44472005000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivo: Determinar la validez de la candidiasis oral (CO) como marcador clínico de evolución en los pacientes infectados por el Virus de la Inmunodeficiencia Humana. Diseño del estudio: En 1992, se efectuó una exploración oral a un colectivo de 200 pacientes infectados por VIH, con una edad media de 36,8±7 años (rango 25-46 años) para establecer el diagnóstico de CO. Se registraron las variables edad, sexo, tiempo de evolución de la enfermedad, conducta de riesgo, número de linfocitos CD4/µL, estadio clínico y tratamiento antirretroviral. De los 200 pacientes del grupo de estudio, 157 no cumplían criterios de SIDA en el momento de la exploración basal y a éstos se les efectuó un seguimiento semestral hasta que cumplieron dichos criterios, concluyendo el estudio al final de 2001. Resultados: De los 157 pacientes seleccionados, 71 (45,2%) no presentaron CO y de éstos el 28,7% evolucionó a SIDA durante el período de seguimiento. De los 86 (54,8%) pacientes con CO, el 48,2% evolucionó a SIDA (RR=2,71). Al trasladar el origen del estudio al año 1997 cuando se inició la administración de la terapia antirretroviral de alta eficacia (TAAE), no se observaron diferencias en el porcentaje de pacientes que evolucionaron a SIDA en relación a la existencia o no de CO en la exploración basal. El análisis multivariante demostró que la asociación de la variable de exposición CO con la evolución a SIDA no alcanzó un valor predictivo. Conclusiones: El valor pronóstico a largo plazo de la CO, no se ha determinado en pacientes que reciben terapia antirretroviral de alta eficacia (TAAE). La recuperación inmunológica y la disminución de enfermedades oportunistas observadas tras la administración de TAAE, hacen que muchos pacientes que alcanzaron la condición de SIDA no cumplan en la actualidad dichos criterios, lo que obliga a renovar la propia definición del síndrome para poder evaluar marcadores de pronóstico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objective: To determine the validity of oral candidiasis (OC) as a clinical marker of progression in patients with human immunodeficiency virus infection. Study design: In 1992, an oral examination was carried out on a group of 200 HIV-infected patients with a mean age of 36.8 ± 7 years (range 25-46 years) to establish the diagnosis of OC. The following variables were recorded: age, sex, duration of the disease, risk behaviour, CD4 lymphocyte count, clinical stage and antiretroviral treatment. Of the 200 patients in the group evaluated, 157 did not fulfil the criteria for AIDS at the time of the baseline examination; these patients constitute the study group and underwent 6-monthly follow-up until they fulfilled these criteria. The study was concluded at the end of 2001. Results: Of the 157 patients selected, 71 (45.2%) did not present OC and, of these, 28.7% progressed to AIDS during the follow-up period. Of the 86 (54.8%) patients with OC, 48.2% progressed to AIDS (RR= 2.71). If the start date of the study was taken as 1997, when highly active antiretroviral therapy (HAART) was introduced, no differences were found in the percentage of patients who progressed to AIDS with respect to the presence or absence of OC at the baseline examination. Multivariate analysis demonstrated that the association of the presence of OC with progression to AIDS did not reach a predictive value. Conclusions: The long-term prognostic value of OC has not been established in patients receiving highly active antiretroviral therapy (HAART). The immunological recovery and the reduction in the number of opportunistic diseases observed after the administration of HAART means that many patients who developed AIDS do not currently satisfy these criteria, making a review of the definition of the syndrome itself a necessity in order to be able to evaluate prognostic markers.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Candidiasis Oral]]></kwd>
<kwd lng="es"><![CDATA[VIH]]></kwd>
<kwd lng="es"><![CDATA[SIDA]]></kwd>
<kwd lng="es"><![CDATA[evolución]]></kwd>
<kwd lng="es"><![CDATA[pronóstico]]></kwd>
<kwd lng="en"><![CDATA[Oral candidiasis]]></kwd>
<kwd lng="en"><![CDATA[HIV]]></kwd>
<kwd lng="en"><![CDATA[AIDS]]></kwd>
<kwd lng="en"><![CDATA[progression]]></kwd>
<kwd lng="en"><![CDATA[prognosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size=5><b> Valor predictivo de la candidiasis oral como marcador de evoluci&oacute;n a SIDA</b></font>        <P><b>Javier Fern&aacute;ndez Feijoo <sup>(1)</sup>, Pedro Diz Dios <sup>(1)</sup>, Xos&eacute; Luis Otero Cepeda <sup>(2)</sup>, Jacobo Limeres Posse <sup>(1)</sup>,&nbsp;    <br>  Javier de la Fuente Aguado <sup>(3)</sup>, Antonio Ocampo Hermida <sup> (3)</sup></b></P>        <P>(1) Dpto. de Estomatolog&iacute;a. Facultad de Medicina y Odontolog&iacute;a. Universidad de Santiago de Compostela. Espa&ntilde;a.    <br> (2) Dpto. de Estad&iacute;stica e Investigaci&oacute;n Operativa. Facultad de Matem&aacute;ticas. Universidad de Santiago de Compostela. Espa&ntilde;a    <br> (3) Unidad de Enfermedades Infecciosas. Servicio de Medicina Interna. Hospital Xeral-C&iacute;es. Vigo, Espa&ntilde;a.</P>  <font size="2"><i>        Correspondencia:&nbsp;    <br>        Pedro Diz Dios&nbsp;    <br>        C/ Panam&aacute; 2; 2&#186;dcha.&nbsp;    <br>        36203 Vigo Espa&ntilde;a&nbsp;    <br>        Fax: 34 981 562226&nbsp;    ]]></body>
<body><![CDATA[<br>        E-mail: <a href="mailto:pdiz@usc.es"> pdiz@usc.es</a></i></font>     <p><font size="2">Recibido: 05-11-2003  Aceptado: 01-02-2004</font></p>       <p aling="center">   <table border="1" width="48%">     <tr>       <td width="100%"><font size="2"> Fern&aacute;ndez-Feijoo J, Diz-Dios P, Otero-Cepeda XL, Limeres-Posse J, de la Fuente-Aguado J, Ocampo-Hermida A. Valor predictivo de la         candi diasis oral como marcador de evoluci&oacute;n a SIDA. Med Oral Patol Oral Cir Bucal 2005;10:32-40.</font>    <br>         <font face="Arial" size="1">  &copy; Medicina Oral S. L. C.I.F. B 96689336 - ISSN 1698-4447</font></td>     </tr>   </table>        <P>&nbsp;</P>        <P><b>RESUMEN</b></P>      <P>Objetivo: Determinar la validez de la candidiasis oral (CO) como marcador cl&iacute;nico de evoluci&oacute;n en los pacientes infectados por el Virus de la Inmunodeficiencia Humana.    <br> Dise&ntilde;o del estudio: En 1992, se efectu&oacute; una exploraci&oacute;n oral a un colectivo de 200 pacientes infectados por VIH, con una edad media de 36,8&#177;7 a&ntilde;os (rango 25-46 a&ntilde;os) para establecer el diagn&oacute;stico de CO. Se registraron las variables edad, sexo, tiempo de evoluci&oacute;n de la enfermedad, conducta de riesgo, n&uacute;mero de linfocitos CD4/µL, estadio cl&iacute;nico y tratamiento antirretroviral. De los 200 pacientes del grupo de estudio, 157 no cumpl&iacute;an criterios de SIDA en el momento de la exploraci&oacute;n basal y a &eacute;stos se les efectu&oacute; un seguimiento semestral hasta que cumplieron dichos criterios, concluyendo el estudio al final de 2001.    <br> Resultados: De los 157 pacientes seleccionados, 71 (45,2%) no presentaron CO y de &eacute;stos el 28,7% evolucion&oacute; a SIDA durante el per&iacute;odo de seguimiento. De los 86 (54,8%) pacientes con CO, el 48,2% evolucion&oacute; a SIDA (RR=2,71). Al trasladar el origen del estudio al a&ntilde;o 1997 cuando se inici&oacute; la administraci&oacute;n de la terapia antirretroviral de alta eficacia (TAAE), no se observaron diferencias en el porcentaje de pacientes que evolucionaron a SIDA en relaci&oacute;n a la existencia o no de CO en la exploraci&oacute;n basal. El an&aacute;lisis multivariante  demostr&oacute; que la asociaci&oacute;n de la variable de exposici&oacute;n CO con la evoluci&oacute;n a SIDA no alcanz&oacute; un valor predictivo.    <br> Conclusiones: El valor pron&oacute;stico a largo plazo de la CO, no se ha determinado en pacientes que reciben terapia antirretroviral de alta eficacia (TAAE). La recuperaci&oacute;n inmunol&oacute;gica y la disminuci&oacute;n de enfermedades oportunistas observadas tras la administraci&oacute;n de TAAE, hacen que muchos pacientes que alcanzaron la condici&oacute;n de SIDA no cumplan en la actualidad dichos criterios, lo que obliga a renovar la propia definici&oacute;n del s&iacute;ndrome para poder evaluar marcadores de pron&oacute;stico. </P>        ]]></body>
<body><![CDATA[<P><i><b>Palabras clave</b>: Candidiasis Oral, VIH, SIDA, evoluci&oacute;n, pron&oacute;stico.</i></P>        <P>&nbsp;</P>        <P><b>INTRODUCCIÓN</b></P>      <P>Se han empleado m&uacute;ltiples marcadores cl&iacute;nicos, biol&oacute;gicos y anal&iacute;ticos para intentar pronosticar la evoluci&oacute;n de la infecci&oacute;n por VIH (1-11). Se ha sugerido que los marcadores de laboratorio pueden reflejar s&oacute;lo parcialmente el estadio y el ritmo de progresi&oacute;n de la enfermedad, por lo que la inclusi&oacute;n de indicadores cl&iacute;nicos ayudar&aacute; a proporcionar una perspectiva m&aacute;s global del paciente. </P>      <P>Algunas lesiones orales asociadas a la infecci&oacute;n por VIH se consideran predictivas de la progresi&oacute;n de la enfermedad (12). Aunque en numerosos trabajos (13-19) se ha confirmado el valor pron&oacute;stico de la candidiasis oral (CO) como indicador de inmunosupresi&oacute;n severa y evoluci&oacute;n a SIDA, en la mayor&iacute;a de estas investigaciones s&oacute;lo se evalu&oacute; el impacto de la CO a corto plazo, antes de la administraci&oacute;n generalizada de la terapia antirretroviral de alta eficacia (TAAE) y en grupos de estudio con una distribuci&oacute;n por conductas de riesgo muy diferente a la de nuestro entorno.</P>      <P>El prop&oacute;sito del presente trabajo fue, analizar la validez de la CO como marcador independiente de progresi&oacute;n a SIDA en un colectivo de pacientes espa&ntilde;oles infectados por VIH y controlados durante un largo per&iacute;odo de seguimiento.</P>        <P><b>MATERIAL Y MÉTODOS</b></P>      <P>En el primer trimestre de 1992 (examen basal), con la finalidad de analizar la prevalencia y las caracter&iacute;sticas de la CO relacionada con la infecci&oacute;n por VIH, se constituy&oacute; un grupo de estudio de 200 pacientes infectados por VIH-1 procedentes de la Unidad de Enfermedades Infecciosas del Hospital Xeral-C&iacute;es de Vigo, perteneciente al Servicio Gallego de Salud. El colectivo de estudio lo conformaron 113 (72%) varones y 44 (28%) mujeres con una edad media de 36,87 a&ntilde;os (rango 25-46 a&ntilde;os). La selecci&oacute;n de los pacientes se efectu&oacute; aplicando los siguientes criterios de inclusi&oacute;n: Edad superior a 18 a&ntilde;os, diagn&oacute;stico de infecci&oacute;n por VIH realizado mediante an&aacute;lisis inmunoenzim&aacute;tico (EIA) confirmado por Western Blot, y participaci&oacute;n voluntaria en el estudio (consentimiento informado). Se excluyeron los pacientes que presentaban alguna de estas caracter&iacute;sticas: uso de antif&uacute;ngicos como profilaxis o tratamiento de entidades nosol&oacute;gicas distintas a la CO (Criptococosis), alteraciones metab&oacute;licas o bioqu&iacute;micas severas, administraci&oacute;n simult&aacute;nea de antibi&oacute;ticos, citost&aacute;ticos o corticosteroides, portadores de pr&oacute;tesis dentales acr&iacute;licas removibles y otros factores predisponentes para el desarrollo de CO (20-34).</P>      <P>Se registraron adem&aacute;s del sexo, la fecha estimada de seroconversi&oacute;n (definida como el primer test positivo de anticuerpos frente al VIH-1), el tiempo de evoluci&oacute;n (n&uacute;mero de semestres transcurridos desde la fecha estimada de la seroconversi&oacute;n hasta la exploraci&oacute;n basal), la conducta de riesgo, la categor&iacute;a cl&iacute;nica de acuerdo con los criterios de los Centros para el Control de las Enfermedades de Atlanta (35), el n&uacute;mero de linfocitos CD4/&#181;L y el tratamiento antirretroviral.</P>      <P>Cada paciente fue sometido a un examen oral en el momento de la exploraci&oacute;n basal, para determinar la existencia de lesiones sugestivas de CO, registr&aacute;ndose las variables cl&iacute;nicas pseudomembranosa, eritematosa, queilitis angular e hiperpl&aacute;sica. Se recogieron muestras con un hisopo est&eacute;ril del dorso de la lengua, del paladar y de la mucosa vestibular bucal. Cuando se observaron alteraciones de la mucosa compatibles con CO se tom&oacute; una muestra adicional de esa zona. Todos los espec&iacute;menes se sembraron en placas de Sabouraud-dextrosa-agar e incubados a 37&#186; C durante 48 horas. Se consideraron positivos desde el punto de vista cuantitativo s&oacute;lo aquellos cultivos con &gt;50 UFC/ml. Las especies de hongos fueron identificadas por los sistemas autom&aacute;ticos Candidafast Unipath y Api 20 C AUX (Biomerieux, Barcelona, Espa&ntilde;a). El diagn&oacute;stico definitivo de CO se estableci&oacute; aplicando criterios cl&iacute;nicos y microbiol&oacute;gicos (36,37).</P>      ]]></body>
<body><![CDATA[<P>Aplicando la definici&oacute;n europea de caso SIDA (38) se realiz&oacute; un registro semestral de evoluci&oacute;n a SIDA en el grupo de pacientes que no cumpl&iacute;an criterios de SIDA en enero de 1992 (n=157), desde esta fecha hasta diciembre de 2001 (final del estudio). El tiempo de evoluci&oacute;n a SIDA se estableci&oacute; como el n&uacute;mero de semestres transcurridos desde la exploraci&oacute;n oral hasta que el paciente desarroll&oacute; alguna enfermedad definitoria de SIDA (35). El tiempo acumulado de evoluci&oacute;n a SIDA se defini&oacute; como el n&uacute;mero de semestres transcurridos desde la fecha estimada de seroconversi&oacute;n hasta que el paciente desarroll&oacute; alguna enfermedad definitoria de SIDA (35).</P>      <P>Para el estudio de la relaci&oacute;n de la variable de inter&eacute;s (presencia o ausencia de CO) con las restantes variables registradas en la exploraci&oacute;n basal (sexo, edad, conducta de riesgo, categor&iacute;a cl&iacute;nica, n&uacute;mero de linfocitos CD4/µL y tratamiento antirretroviral), se utilizaron tablas de contingencia, a partir de la cuales se estimaron prevalencias, se calcularon riesgos relativos (cociente de prevalencias: &#147;Risk Ratio&#148; &#150;RR-) y errores t&iacute;picos, y se construyeron intervalos de confianza.</P>      <P>Se aplic&oacute; el modelo de regresi&oacute;n de Cox para estimar la magnitud de los riesgos relativos (Raz&oacute;n de peligros: &#147;Relative Hazards&#148; &#150;RH-) en los diferentes factores de riesgo considerados en el estudio. Comenzamos estimando el riesgo relativo de la variable CO aislada mediante un modelo de regresi&oacute;n de Cox univariante y posteriormente se ajust&oacute; el efecto de la CO por las dem&aacute;s variables del estudio mediante modelos de regresi&oacute;n de Cox multivariantes.</P>      <P><b>RESULTADOS</b></P>      <P>Descriptivo    <br> El tiempo medio de evoluci&oacute;n desde la fecha estimada de seroconversi&oacute;n hasta el momento de la exploraci&oacute;n basal en 1992 fue de 4,7&#177;4,2 semestres. Seg&uacute;n la conducta de riesgo, 112 (71%) pertenec&iacute;an al grupo de adictos a drogas por v&iacute;a parenteral -ADVP-, 20 (12,5%) eran varones homosexuales y 25 (16,5%) pacientes se hab&iacute;an contagiado por relaciones heterosexuales.En el momento de la exploraci&oacute;n basal, 81 pacientes pertenec&iacute;an al estadio cl&iacute;nico A (51,5%) y 76 al B (48,5%). Por niveles de linfocitos CD4/µL, 41 pacientes (26 %) ten&iacute;an m&aacute;s de 500 linfocitos CD4/µL, 77 (49%) ten&iacute;an entre 200 y 500 linfocitos CD4/µL y 39 (25%) ten&iacute;an menos de 200 linfocitos CD4/µL. S&oacute;lo el 50,3 % de los pacientes recib&iacute;an tratamiento antirretroviral en 1992, 75 con AZT y 4 con AZT+ddI.</P>      <P>Candidiasis Oral    <br> En el momento de la exploraci&oacute;n inicial 86 pacientes (54%) presentaban CO, de los cuales 69 (80%) casos correspond&iacute;an a la forma pseudomembranosa, 13 (15,5%) a la eritematosa, 2 ten&iacute;an queilitis angular, 1 candidiasis hiperpl&aacute;sica y 1 caso formas cl&iacute;nicas mixtas. La especie predominante fue <i> Candida albicans</i> (92,5%), aisl&aacute;ndose en los dem&aacute;s casos <i> no-albicans spp</i>. (<i>krusei, glabrata, guilliermondii, lambica y parapsilosis</i>).</P>      <P>La prevalencia de CO fue mayor en varones que en mujeres (64,3% frente a 50,8%), aunque esta diferencia no result&oacute; significativa (RR= 1,26; IC95%: 0,95-1,67). El tiempo transcurrido desde la fecha de seroconversi&oacute;n hasta el momento de la exploraci&oacute;n basal fue de 4,8&#177;4,4 semestres en los pacientes con CO y de 4,4&#177;4,0 semestres en los que no presentaban CO, no alcanzando esta diferencia significaci&oacute;n estad&iacute;stica. Al distribuir a los pacientes por conductas de riesgo en 2 grupos, ADVP y contagiados por v&iacute;a sexual (heterosexual y homosexual), observamos una prevalencia de CO en el primer grupo de 65,5% y en el segundo grupo de 49,1%. El riesgo relativo estimado del grupo de ADVP frente al de contagio sexual fue RR=1,33 (IC 95%: 0,99-1,58); esta diferencia no result&oacute; significativa. La relaci&oacute;n de CO con el estadio cl&iacute;nico demostr&oacute; un aumento de la prevalencia de CO a medida que se agravaba el estadio. El riesgo relativo del grupo B frente al A fue RR (B/A)= 1,51 (IC 95%: 1,12-2,03). El riesgo relativo del grupo C frente al A fue RR (C/A)= 2,02 (IC 95%: 1,53-2,66). En ambos casos el RR fue significativamente superior a 1. La prevalencia de CO aument&oacute; a medida que disminu&iacute;a el nivel de linfocitos CD4/µL; la prevalencia de CO en el grupo de nivel intermedio de linfocitos CD4/µL (200-500) no fue significativamente superior a la del grupo de nivel de linfocitos m&aacute;s alto (&gt;500/µL), siendo el riesgo relativo RR= 1,28 (IC 95%: 0,85-1,91); pero la prevalencia de CO en el grupo de linfocitos CD4&lt;200/µL fue significativamente mayor que la del grupo de linfocitos CD4/µL&gt;500, con un RR= 1,92 (IC 95%: 1,32-2,78). Los pacientes sometidos a tratamiento antirretroviral en 1992 presentaban una prevalencia de CO algo mayor que los no tratados, aunque esta diferencia no fue significativa (RR= 1,21; IC 95%: 0,96-1,51).</P>      <P>Tiempo de Evoluci&oacute;n a SIDA    ]]></body>
<body><![CDATA[<br> En el momento de la exploraci&oacute;n basal, de los 200 pacientes seleccionados, 157 no cumpl&iacute;an criterios de SIDA. De ellos, 86 pacientes (54%) presentaban CO frente a 71 (46%) que no ten&iacute;an lesiones cl&iacute;nicas. Tras 20 semestres de seguimiento, el 48,2% de los enfermos con CO y el 28,7% de los que no presentaban CO hab&iacute;an desarrollado SIDA. Esta diferencia result&oacute; estad&iacute;sticamente significativa (p= 0,012). El riesgo relativo estimado de evoluci&oacute;n a SIDA para los pacientes con CO comparado con los que no la padec&iacute;an fue RR= 1,44 (IC 95%: 1,08-1,91) (<a href="#f1">Figura 1</a>). Entre el a&ntilde;o 1997 y el 2001 (&uacute;ltimos 10 semestres del seguimiento), la frecuencia de evoluci&oacute;n a SIDA fue del 7,7% y del 6,8% en los pacientes con y sin CO respectivamente, sin que la diferencia observada entre ambos grupos alcanzara significaci&oacute;n estad&iacute;stica (<a href="#f2">Figura 2</a>). No se encontraron diferencias estad&iacute;sticamente significativas para el tiempo de evoluci&oacute;n a SIDA en relaci&oacute;n al tipo de presentaci&oacute;n cl&iacute;nica de la CO (pseudomembranosa frente a otras formas cl&iacute;nicas), ni a la especie de <i> Candida</i> aislada (<i>Candida albicans</i> frente a otras <i> spp</i>.).</P>      <P align="center"><a name="f1"><img border="0" src="/img/medicor/v10n1/06/image01.gif" width="410" height="400"></a></P>      <P align="center"><a name="f2"><img border="0" src="/img/medicor/v10n1/06/image02.gif" width="405" height="431"></a></P>      <P>La asociaci&oacute;n de la variable CO con la evoluci&oacute;n a SIDA persisti&oacute; despu&eacute;s de ajustar por la covariable estadio cl&iacute;nico (estadios A y B) (p= 0,007). El riesgo de evoluci&oacute;n a SIDA continu&oacute; siendo m&aacute;s elevado en los pacientes con CO (RH= 2,04; IC 95%: 1,20-3,50). Cuando analizamos la asociaci&oacute;n de CO y la evoluci&oacute;n a SIDA ajustando por la variable linfocitos CD4/&#181;L categorizada en 3 grupos (&lt;200, 200-500, &gt;500) no se alcanz&oacute; significaci&oacute;n estad&iacute;stica (p= 0,051). Sin embargo, al estratificar a los pacientes por niveles de linfocitos CD4/&#181;L, la CO mantuvo su valor predictivo de evoluci&oacute;n a SIDA en los enfermos con &gt;500 linfocitos CD4/&#181;L (RH= 3,30; IC 95%: 1,10-10,20). En el an&aacute;lisis bivariante, las variables edad, sexo, tiempo de evoluci&oacute;n de la enfermedad, conducta de riesgo y tratamiento antirretroviral no condicionaron el resultado, por lo que fueron eliminadas por el sistema.</P>      <P>Despu&eacute;s de ajustar por las covariables descritas (edad, sexo, tiempo de evoluci&oacute;n de la enfermedad, conducta de riesgo, estadio cl&iacute;nico, n&uacute;mero de linfocitos CD4/&#181;L y tratamiento antirretroviral), comprobamos mediante el an&aacute;lisis multivariante que la asociaci&oacute;n de la variable de exposici&oacute;n CO con la evoluci&oacute;n a SIDA no alcanz&oacute; valor predictivo.</P>        <P><b>DISCUSIÓN</b></P>      <P>En 1993 los Centros para el Control de las Enfermedades de Atlanta publicaron una clasificaci&oacute;n modificada de la definici&oacute;n de SIDA, que consideraba criterios definitorios independientes una serie de marcadores cl&iacute;nicos y un indicador de laboratorio, la concentraci&oacute;n de linfocitos CD4 (35). Un reflejo del impacto de esta nueva definici&oacute;n desde el punto de vista cl&iacute;nico, fue el trabajo en el que Prins et al (39) analizaron la mortalidad pre-SIDA en pacientes infectados por VIH, demostrando que en ADVP la mortalidad pre-SIDA hab&iacute;a disminuido considerablemente, sugiriendo que pod&iacute;a deberse a que algunas causas frecuentes de muerte pre-SIDA en este colectivo como la tuberculosis pulmonar y la neumon&iacute;a recurrente se hab&iacute;an incorporado a la definici&oacute;n ampliada de SIDA (39). Con respecto a los niveles de linfocitos CD4, en contraste con los expertos norteamericanos, los europeos no incluyeron a los pacientes con &lt;200 c&eacute;ls./µL en la definici&oacute;n ampliada de caso SIDA (38), ya que aplicando este criterio se incluir&iacute;an en el estadio SIDA muchos individuos asintom&aacute;ticos.</P>      <P>Para analizar el valor de la CO como predictor de evoluci&oacute;n a SIDA (aplicando el criterio europeo), seleccionamos aleatoriamente un grupo de estudio cuya distribuci&oacute;n por edad, sexo, conducta de riesgo, estadio cl&iacute;nico y pautas de tratamiento antirretroviral result&oacute; muy similar a la de los pacientes infectados por VIH detectados en otras regiones espa&ntilde;olas en la misma &eacute;poca (40).</P>      <P>La exclusi&oacute;n de los pacientes etiquetados de SIDA en el momento de iniciar el estudio tambi&eacute;n podr&iacute;a constituir un sesgo, ya que se ha sugerido que estos enfermos, a diferencia de los que conformaron el grupo de estudio definitivo, podr&iacute;an haberse infectado antes, o haber estado expuestos a determinados cofactores que favorecieron la progresi&oacute;n de la enfermedad (41). Sin embargo, el tiempo real de evoluci&oacute;n de la infecci&oacute;n no se conoce en la mayor&iacute;a de los casos y presumiblemente es muy variable. En su defecto, en casi todos los estudios publicados se aplica como tiempo de evoluci&oacute;n el transcurrido desde el primer test positivo de diagn&oacute;stico de infecci&oacute;n por VIH, por lo que el hipot&eacute;tico sesgo se ha venido reproduciendo de forma generalizada en la literatura especializada y por consiguiente as&iacute; definimos la &#147;fecha estimada de seroconversi&oacute;n&#148; en el apartado de metodolog&iacute;a.</P>      <P>Se ha demostrado que la CO aparece precozmente en la historia natural de la infecci&oacute;n por VIH (42) y despu&eacute;s su prevalencia permanece bastante estable durante a&ntilde;os (43). La incidencia acumulada de CO (proporci&oacute;n de al menos un episodio de CO durante un tiempo de seguimiento determinado) no se registr&oacute;, debido a que algunos pacientes pueden desarrollar CO durante los per&iacute;odos que transcurren entre 2 visitas de control, y recibir tratamiento antif&uacute;ngico por su m&eacute;dico o autoprescribirse, lo que puede hacer que la lesi&oacute;n haya desaparecido en el momento de la pr&oacute;xima exploraci&oacute;n (42). Adem&aacute;s, el autodiagn&oacute;stico de CO ha demostrado una fiabilidad limitada (42). En consecuencia, s&oacute;lo se consideraron las lesiones presentes durante la exploraci&oacute;n basal &uacute;nica efectuada en 1992.</P>      ]]></body>
<body><![CDATA[<P>Coincidiendo con otros autores (44), no encontramos diferencias estad&iacute;sticamente significativas en la presentaci&oacute;n de CO entre mujeres y varones. De acuerdo con trabajos previos (45), la prevalencia de CO fue mayor entre los ADVP.</P>      <P>En el presente estudio la tasa de progresi&oacute;n a SIDA fue mayor entre los pacientes con CO que en los que no ten&iacute;an lesiones f&uacute;ngicas. Otros investigadores como Katz et al (17), Coates et al (18) o Maden et al (19) ya hab&iacute;an demostrado, antes de la aplicaci&oacute;n de la TAAE, que los pacientes con CO progresaban m&aacute;s r&aacute;pidamente a SIDA que los que no ten&iacute;an CO. La existencia de CO se considera un indicador de inmunosupresi&oacute;n (46); ya a finales de los a&ntilde;os 80 Moniaci et al (5) observaron en una importante cohorte de pacientes italianos, que la CO se asociaba a niveles bajos de linfocitos CD4; este hallazgo se confirm&oacute; posteriormente en m&uacute;ltiples publicaciones (14-16, 47), incluso en pacientes que recib&iacute;an TAAE (48). Teniendo en cuenta la definici&oacute;n europea de caso SIDA, la constataci&oacute;n de que la CO se relaciona con la progresi&oacute;n a SIDA se fundamenta en que estas lesiones orales tambi&eacute;n predicen el desarrollo de otras enfermedades oportunistas en el plazo de 3 meses (49).</P>      <P>Algunos autores (47, 50), relacionaron la CO pseudomembranosa con estadios avanzados de la enfermedad y le atribuyeron un mayor valor predictivo para detectar inmunosupresi&oacute;n que a otras variedades cl&iacute;nicas (48, 51). Sin embargo, coincidiendo con otros investigadores (52), en el presente estudio la variedad cl&iacute;nica de candidiasis no condicion&oacute; la progresi&oacute;n a SIDA.</P>      <P>Los criterios de selecci&oacute;n de los pacientes para recibir tratamiento farmacol&oacute;gico y la eficacia de la terapia antirretroviral, han variado sustancialmente a lo largo del per&iacute;odo de seguimiento del presente estudio (53-55). Inicialmente, s&oacute;lo los pacientes m&aacute;s deteriorados cl&iacute;nica e inmunol&oacute;gicamente recib&iacute;an terapia espec&iacute;fica, por lo que la prevalencia de SIDA en este grupo era muy elevada, independientemente de la presencia o no de CO. El porcentaje de pacientes que recib&iacute;an tratamiento en nuestra serie en 1992, result&oacute; similar al reflejado en otras publicaciones (56). La proporci&oacute;n de los pacientes que recib&iacute;an TAAE al finalizar el estudio, fue similar en aqu&eacute;llos sin y con CO en la exploraci&oacute;n basal (64,7% y 68,5% respectivamente).</P>      <P>Al considerar el tiempo acumulado de evoluci&oacute;n a SIDA, la CO mantuvo su valor pron&oacute;stico. Como ya hab&iacute;an sugerido Phillips et al (57) y recientemente Hilton (58), el tiempo de evoluci&oacute;n de la infecci&oacute;n por VIH a&ntilde;ade poco valor a modelos de riesgo de SIDA que incluyen historia de un episodio de CO y su inmediatez.</P>      <P>En el an&aacute;lisis multivariante la presencia de CO no condicion&oacute; la evoluci&oacute;n a SIDA, lo que obliga a comentar las variables que podr&iacute;an influir en el ritmo de progresi&oacute;n de la infecci&oacute;n. Pezzotti et al (59) sugirieron que la enfermedad progresaba m&aacute;s r&aacute;pidamente en los pacientes de mayor edad, pero el rango etario de nuestro grupo de estudio fue tan reducido que la variable qued&oacute; excluida del sistema. El sexo del paciente no condiciona el ritmo de progresi&oacute;n a SIDA (60, 61). Como ya se ha se&ntilde;alado, en estudios de CO no hay diferencias sustanciales si consideramos el tiempo transcurrido desde el examen basal o el acumulado desde la seroconversi&oacute;n (58). La conducta de riesgo de transmisi&oacute;n de la enfermedad tampoco parece condicionar su evoluci&oacute;n (59). En nuestro estudio no se registr&oacute; la carga viral, porque en 1992 a&uacute;n no se dispon&iacute;a t&eacute;cnicamente de dicha determinaci&oacute;n; se considera que la combinaci&oacute;n de la carga viral del VIH-1 y el n&uacute;mero de linfocitos CD4/L, constituyen el mejor predictor de progresi&oacute;n de la enfermedad (62), pero se ha demostrado que aunque la CO se asocia a cargas virales elevadas (63-65), conserva su valor pron&oacute;stico de evoluci&oacute;n a SIDA independientemente de la carga viral (66). Con respecto a la terapia antirretroviral, es evidente que ya antes de la introducci&oacute;n de la TAAE el tratamiento reduc&iacute;a el riesgo a largo plazo de evoluci&oacute;n a SIDA (56). En el presente estudio, hasta 1997 la CO se mostraba como un marcador de evoluci&oacute;n m&aacute;s importante que el tratamiento antirretroviral; la inclusi&oacute;n de un per&iacute;odo pre-TAAE y otro post-TAAE en el tiempo de seguimiento, ha condicionado sin duda el resultado, ya que con la TAAE disminuye el n&uacute;mero de episodios de CO (67-69) y el ritmo de progresi&oacute;n a SIDA (70).</P>      <P>Hasta la fecha no se han publicado estudios a largo plazo sobre el valor predictivo de la CO en pacientes tratados con TAAE. Uno de sus principales inconvenientes deriva de la propia definici&oacute;n de SIDA, cuyo car&aacute;cter est&aacute;tico etiqueta definitivamente a un paciente que haya padecido alguna enfermedad definitoria y presentado niveles de linfocitos CD4 por debajo de 200 c&eacute;ls./&#181;L, independientemente de su estado actual en base a la respuesta cl&iacute;nica e inmunol&oacute;gica al tratamiento antirretroviral. Nuestros resultados confirman que la CO no es un marcador selectivo de evoluci&oacute;n a SIDA en pacientes con acceso a la TAAE, en los que podr&iacute;a expresar defectos de adherencia o desarrollo de resistencias, y habr&iacute;a que reevaluar su importancia en un modelo multivariante. Por el contrario, confirma su utilidad para predecir la evoluci&oacute;n de la enfermedad en los pa&iacute;ses sin acceso a las determinaciones de los tests de laboratorio ni a la TAAE.</P>      <P><b>BIBLIOGRAFIA</b></P>      <!-- ref --><P>1  Muzyka BC, Lurie D, Salkin LM. Oral manifestations associated with HIV-related disease as markers for immune supression and AIDS. 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