<?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>1315-2556</journal-id>
<journal-title><![CDATA[Revista de la Sociedad Venezolana de Microbiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Soc. Ven. Microbiol.]]></abbrev-journal-title>
<issn>1315-2556</issn>
<publisher>
<publisher-name><![CDATA[Organo Oficial de la Sociedad Venezolana de Microbiología.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1315-25562001000200017</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Malaria y fármacos antimaláricos]]></article-title>
<article-title xml:lang="en"><![CDATA[Malaria and antimalarian drugs]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chassaigne]]></surname>
<given-names><![CDATA[J. A]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Experimental Francisco de Miranda Programa de Medicina Area Ciencias de la Salud]]></institution>
<addr-line><![CDATA[Coro ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2001</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2001</year>
</pub-date>
<volume>21</volume>
<numero>2</numero>
<fpage>85</fpage>
<lpage>88</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S1315-25562001000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S1315-25562001000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S1315-25562001000200017&amp;lng=en&amp;nrm=iso"></self-uri><kwd-group>
<kwd lng="es"><![CDATA[Malaria]]></kwd>
<kwd lng="es"><![CDATA[fármacos antimaláricos]]></kwd>
<kwd lng="es"><![CDATA[paludismo]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"> <b><font face="Verdana">Malaria y f&aacute;rmacos  antimal&aacute;ricos    <br> </font></b>      <p align="center"> <b><font face="Verdana"> Malaria and antimalarian drugs</font></b><font face="Verdana"> </font>  </p>     <p align="center"><font face="Verdana" size="2">Chassaigne, J. A.    <br> </font></p>     <p align="justify"><font face="Verdana" size="2">   Profesor Agregado, C&aacute;tedra de Farmacolog&iacute;a, Area Ciencias de la    Salud, Programa de Medicina,Universidad Nacional Experimental &quot;Francisco    de Miranda&quot;, Coro, Venezuela.    <br> </font></p>     <p align="justify"><font face="Verdana" size="2"> <b>Palabras-clave: </b>Malaria, f&aacute;rmacos    antimal&aacute;ricos, paludismo.</font></p>     <p align="justify"><b><font face="Verdana" size="2">Introducci&oacute;n</font></b></p>     <p align="justify"> <font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La Malaria o Paludismo    es una infecci&oacute;n protozoaria, caracterizada por la aparici&oacute;n de    episodios parox&iacute;sticos de fiebre, escalofr&iacute;os y sudoraci&oacute;n    y por cursar con anemia, esplenomegalia y una evoluci&oacute;n cr&oacute;nica    recidivante (1). El hombre puede infectarse por 4 tipos de plasmodios distintos:    Plasmodium vivax, P. falciparum, P. malariae y P. ovale.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La infecci&oacute;n se produce    por picadura del mosquito Anopheles hembra infectado, por transfusi&oacute;n    de sangre de un donante infectado, o por inoculaci&oacute;n involuntaria de    sangre por compartir jeringas en los drogadictos.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Se estima que causa aproximadamente    tres millones de muertes al a&ntilde;o en todo el mundo, principalmente en los    tr&oacute;picos y pa&iacute;ses en desarrollo, donde adem&aacute;s cada vez    se presentan m&aacute;s cepas de P. falciparum (el plasmodio m&aacute;s agresivo)    resistente a m&uacute;ltiples f&aacute;rmacos. La malaria es hiperend&eacute;mica    en Africa, India, sureste asi&aacute;tico, China, Ocean&iacute;a, Hait&iacute;,    Sur y Centroam&eacute;rica, M&eacute;xico y Rep&uacute;blica Dominicana (2).    Durante los a&ntilde;os 1950-1960, la Organizaci&oacute;n Mundial de la Salud    consigui&oacute; erradicar el paludismo en las &aacute;reas de incidencia, mediante    un programa de insecticidas residuales y f&aacute;rmacos antimal&aacute;ricos,    pero a partir del a&ntilde;o 1970 el programa fracas&oacute;, bien por razones    econ&oacute;micas o por factores administrativos, y surgieron nuevas infecciones,    alcanzando en el a&ntilde;o 1988 el mismo nivel que cuando se inici&oacute;    la erradicaci&oacute;n: alrededor de 250 millones de casos. En Europa y EUA    &uacute;nicamente se observan casos espor&aacute;dicos, principalmente debidos    al turismo (1, 2). La infecci&oacute;n se ha incrementado en a&ntilde;os recientes,    y la terap&eacute;utica es cada d&iacute;a m&aacute;s dif&iacute;cil, por el    incremento de la resistencia del par&aacute;sito a las drogas antimal&aacute;ricas.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; En este art&iacute;culo    se revisar&aacute;n en forma breve los mecanismos y patrones de resistencia    a la quimioterapia antimal&aacute;rica y las drogas disponibles para el tratamiento    de la malaria.</font></p>     <p align="justify"><b><font face="Verdana" size="2">Principios Generales    de la Terapia</font></b></p>     <p align="justify"> <font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; El tratamiento de la malaria    implica medidas de soporte, adem&aacute;s de las drogas antimal&aacute;ricas    espec&iacute;ficas. Es importante que en pacientes con malaria por P. falciparum    el tratamiento se inicie sin retardo; generalmente deben ser hospitalizados    y observados, para evidenciar cualquier complicaci&oacute;n. Esto es particularmente    cierto para pacientes diagnosticados con malaria falciparum en pa&iacute;ses    no end&eacute;micos, como Estados Unidos y Europa. Los pacientes con infecci&oacute;n    por P. vivax, P. malariae o P. ovale pueden ser tratados en forma ambulatoria.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; En pa&iacute;ses no end&eacute;micos,    debe confirmarse el diagn&oacute;stico de malaria antes de iniciar el tratamiento,    ya que los s&iacute;ntomas inespec&iacute;ficos pueden corresponder a otras    enfermedades infecciosas. En &aacute;reas end&eacute;micas, donde no sea posible    hacer un diagn&oacute;stico r&aacute;pido, puede ser necesario realizar terapia    emp&iacute;rica. Algunos estudios han demostrado que el retardo en el reconocimiento    y tratamiento de la infecci&oacute;n esta asociado con incremento en la morbilidad    y mortalidad (3). El &iacute;ndice de casos fatales de malaria por P. falciparum    importada var&iacute;a de 0,6 a 3,8% (4).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La progresi&oacute;n de    infecci&oacute;n asintom&aacute;tica a la muerte puede ocurrir en un lapso de    36 a 48 horas (5).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La malaria severa o grave    debe manejarse en una unidad de cuidados intensivos, donde se haga un monitoreo    continuo de la hidrataci&oacute;n y del balance electrol&iacute;tico. Puede    ser necesaria la administraci&oacute;n de acetaminofen para la fiebre, benzodiacepinas    para las convulsiones y soluciones glucosadas para la hipoglicemia. Puede requerirse    di&aacute;lisis temprana, para la insuficiencia renal aguda, y ventilaci&oacute;n    a presi&oacute;n positiva para el edema pulmonar no cardiog&eacute;nico (3-5).</font></p>     <p align="justify"><b><font face="Verdana" size="2">F&aacute;rmacos Antimal&aacute;ricos</font></b></p>     <p align="justify"> <font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Ninguna de las drogas antimal&aacute;ricas    disponibles act&uacute;a sobre todos los estadios del ciclo vital del par&aacute;sito    del paludismo para inhibir o matar al mismo. Las drogas disponibles para el    tratamiento de la malaria incluyen:</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Derivados quinol&iacute;nicos    : Cloroquina, quinina, quinidina, amodiaquina, mefloquina, halofantrina, lumefantrina    y primaquina. Estas drogas inhiben la actividad de la hemo-polimerasa en la    vacuola alimenticia del par&aacute;sito mal&aacute;rico, interfiriendo en la    conversi&oacute;n del hemo (intermediario t&oacute;xico producido durante la    degradaci&oacute;n de la hemoglobina) en la hemozo&iacute;na no t&oacute;xica    o pigmento mal&aacute;rico; adem&aacute;s, ejercen una acci&oacute;n secundaria,    que involucra la inhibici&oacute;n de la s&iacute;ntesis de los &aacute;cidos    nucleicos y las prote&iacute;nas en el par&aacute;sito. La cloroquina, adem&aacute;s,    inhibe la liberaci&oacute;n y acci&oacute;n del factor de necrosis tumoral alfa    (TNF-a) (6). Las primeras siete drogas son esquizonticidas sangu&iacute;neos    eficaces frente a las formas eritroc&iacute;ticas de las 4 especies de plasmodio,    pero sin efectos sobre los esporozo&iacute;tos o hipnozo&iacute;tos. La primaquina    act&uacute;a sobre las formas intrahep&aacute;ticas (hipnozo&iacute;tos) y posee    acci&oacute;n gametocida. Es el &uacute;nico f&aacute;rmaco que puede provocar    una cura radical de aquellas formas de malaria en que los par&aacute;sitos se    encuentran en estado latente en el h&iacute;gado (P. vivax y P. ovale).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Antifolatos: Pirimetamina,    sulfonamidas, dapsona , proguanil y la combinaci&oacute;n pirimetamina-sulfadoxina    (Fansidar&reg;). Tienen acci&oacute;n sobre formas intrahep&aacute;ticas del    par&aacute;sito, excluyendo los hipnozo&iacute;tos. La pirimetamina es adem&aacute;s    gametocida, con lo cual previene la transmisi&oacute;n por el mosquito y el    mantenimiento de la enfermedad en el hombre (profilaxis verdadera).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Derivados de la artemisinina:    Artemisinina, artemetero y artesunato. La artemisinina es un derivado del qinghaosu,    usado como antipir&eacute;tico en la farmacopea china; artemetero y artesunato    son lactonas sesquiterp&eacute;nicas derivadas de la artemisinina. Estas drogas    act&uacute;an en la vacuola alimenticia del par&aacute;sito, interfiriendo en    la conversi&oacute;n del hemo en hemozo&iacute;na no t&oacute;xica pero, a diferencia    de los derivados quinol&iacute;nicos que obstaculizan la polimerizaci&oacute;n,    los derivados de la artemisinina producen metabolitos reactivos, como resultado    de la interacci&oacute;n de su puente per&oacute;xido con el hierro del hemo.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Antibi&oacute;ticos: Clindamicina,    atovaquona y tetraciclinas. Tienen efecto sin&eacute;rgico con los derivados    quinol&iacute;nicos, incrementando la acci&oacute;n esquizonticida sangu&iacute;nea.</font></p>     <p align="justify"><b><font face="Verdana" size="2">Resistencia a Drogas    Antimal&aacute;ricas</font></b></p>     <p align="justify"> <font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La resistencia a f&aacute;rmacos    antimal&aacute;ricos puede ser parcial, con eliminaci&oacute;n de la parasitemia,    seguido de un recrudecimiento en 28 d&iacute;as (RI) o una disminuci&oacute;n    en la parasitemia sin eliminaci&oacute;n (RII) o resistencia de alto nivel sin    disminuci&oacute;n detectable de la parasitemia (RIII).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Resistencia a cloroquina:    No se ha observado resistencia de P. ovale y P. malariae a la cloroquina. Se    han reportado cepas de P. vivax resistentes a cloroquina en Africa, Centro y    Sudam&eacute;rica, Pap&uacute;a-Nueva Guinea, Indonesia, India, Myanmar y Vanuatu    (7-10). La resistencia a cloroquina cl&iacute;nicamente importante est&aacute;    confinada a Pap&uacute;a-Nueva Guinea e Iriam Jaya (11). Se desconoce el mecanismo    de resistencia de P. vivax a la cloroquina, pero probablemente dependa de una    disminuci&oacute;n de la captaci&oacute;n o excreci&oacute;n r&aacute;pida de    la droga.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La malaria por P. falciparum    resistente a cloroquina actualmente est&aacute; dispersa en todos los pa&iacute;ses    con endemia a P. falciparum, excepto Hait&iacute;, M&eacute;xico, Rep&uacute;blica    Dominicana, Argentina, Paraguay, zonas de Centroam&eacute;rica, al oeste del    canal de Panam&aacute;, Mauricio y Egipto (11). La mayor&iacute;a de las infecciones    por P. falciparum requieren de otras alternativas terap&eacute;uticas. La resistencia    de P. falciparum a la cloroquina se debe a un mecanismo de exoflujo incrementado    del f&aacute;rmaco en las ves&iacute;culas del par&aacute;sito y/o a un mayor    metabolismo o detoxicaci&oacute;n de la cloroquina por el par&aacute;sito; aunque    las bases gen&eacute;ticas que favorecen la resistencia del protozoario a la    droga no han sido definidas (12).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Resistencia a primaquina:    Se ha reportado tolerancia o resistencia de cepas de P. vivax a la primaquina    en Ocean&iacute;a y Tailandia (2, 13). El mecanismo es desconocido, pero la    erradicaci&oacute;n de los hipnozo&iacute;tos hep&aacute;ticos puede conseguirse    con altas dosis y/o ciclos largos de primaquina.</font></p>     <p align="justify"><font face="Verdana" size="2">Resistencia a quinina, mefloquina    y halofantrina: Se ha descrito resistencia cruzada para estas tres drogas y    cepas resistentes de P. falciparum a la mefloquina y halofantrina en Tailandia    (14, 15). En algunas &aacute;reas del oeste africano se ha observado resistencia    in vitro de P. falciparum a la mefloquina, pero sin importancia cl&iacute;nica,    siendo efectiva la droga en esta regi&oacute;n (16, 17). El mecanismo de resistencia    de P. falciparum a estas drogas est&aacute; asociado con amplificaci&oacute;n    de genes mdr-similares.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Algunos estudios muestran    la presencia de cepas de P. falciparum resistente a la quinina en Tailandia,    Vietnam, Camboya, Myanmar, Camer&uacute;n y parte de la Amazon&iacute;a. Un    ensayo realizado en Camboya demostr&oacute; s&oacute;lo un 60% de cura con monoterapia    con quinina, aunque la combinaci&oacute;n con tetraciclinas result&oacute; ser    altamente eficaz en esta regi&oacute;n (11).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Resistencia a antifolatos:    La resistencia de P. falciparum a la combinaci&oacute;n pirimetamina-sulfadoxina    (Fansidar&reg;) prevalece en Sudam&eacute;rica (Amazonas), sureste asi&aacute;tico,    Tailandia, Camboya, Myanmar y &aacute;reas del Africa sub-sahariana (10). El    mecanismo de resistencia est&aacute; asociado a mutaciones puntuales en las    enzimas dihidrofolato reductasa y timidilato sintetasa del par&aacute;sito,    lo que impide la uni&oacute;n del f&aacute;rmaco al sitio activo.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Resistencia a los antibi&oacute;ticos:    En infecciones por P. falciparum la resistencia a la clindamicina y la atovaquona    se desarrolla r&aacute;pidamente si estos agentes se usan como monoterapia.    La resistencia a la atovaquona es mediada por mutaciones puntuales &uacute;nicas    en el gen citocromo-b. La mayor&iacute;a de las cepas de P. falciparum permanecen    sensibles a las tetraciclinas.</font></p>     <p align="justify"><font face="Verdana" size="2"> No se ha descrito resistencia    a los derivados de la artemisinina.</font></p>     <p align="justify"><b><font face="Verdana" size="2">Reg&iacute;menes Terap&eacute;uticos    Recomendados</font></b></p>     <p align="justify"> <font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; P. vivax cloroquina-sensible,    P. ovale y P. malariae: Pueden ser tratadas inicialmente con cloroquina 10 mg    base/Kg (m&aacute;ximo: 600 mg base) por v&iacute;a oral, seguido de 5 mg/Kg    base (m&aacute;ximo: 300 mg base) a las 6, 24 y 48 horas. El &iacute;ndice de    curaci&oacute;n supera el 95% (18). La cloroquina usualmente es bien tolerada,    aunque puede causar n&aacute;useas, prurito y desordenes neuropsiqui&aacute;tricos    transitorios. En caso de sobredosis con cloroquina, debe darse diazepam a la    dosis recomendada (19, 20). En pacientes que no toleren la v&iacute;a oral debe    utilizarse cloroquina intravenosa 10 mg base/Kg (m&aacute;ximo: 600 mg) en 8    horas, seguidos de 15 mg base/Kg (m&aacute;ximo: 900 mg) durante 24 horas. Como    alternativa terap&eacute;utica puede usarse gluconato de quinidina o quinina.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Los pacientes con P. vivax    resistente a cloroquina pueden ser tratados con mefloquina, halofantrina o sulfato    de quinina mas tetraciclinas o sulfonamidas. Para la prevenci&oacute;n de reca&iacute;das    en la infecci&oacute;n por P. vivax o P. ovale debido a los hipnozo&iacute;tos    hep&aacute;ticos debe administrarse fosfato de primaquina 0,25 mg base/Kg (dosis    usual: 15 mg base) diariamente por 14 d&iacute;as en pacientes de &aacute;reas    no end&eacute;micas, despu&eacute;s deben completar un ciclo de cloroquina.    Antes de iniciar el tratamiento con primaquina los pacientes deben ser estudiados,    para determinar deficiencia de glucosa-6 fosfato-deshidrogenasa y prevenir hem&oacute;lisis    oxidativa severa.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La primaquina puede producir    n&aacute;useas y dolor abdominal. Es la &uacute;nica droga aceptada para la    erradicaci&oacute;n de hipnozo&iacute;tos hep&aacute;ticos, aunque f&aacute;rmacos    como la tafenoquina (WR 328605), estructuralmente relacionados y de vida media    larga, est&aacute;n en fase de investigaci&oacute;n cl&iacute;nica (21).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Malaria por P. falciparum:    Los pacientes con malaria por P. falciparum cloroquina-sensible deben ser tratados    con cloroquina, como se mencion&oacute; arriba, aunque en la mayor&iacute;a    de los casos se asume que P. falciparum es resistente a la cloroquina.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; R&eacute;gimen con quinina:    La terapia recomendada para pacientes con malaria por P. falciparum resistente    a cloroquina que toleran la v&iacute;a oral es sulfato de quinina 10 mg sal/Kg    (m&aacute;ximo: 650 mg) cada 8 horas por 3 a 7 d&iacute;as, combinado con 3    tabletas de pirimetamina-sulfadoxina (25/500 mg) por 3 d&iacute;as si la malaria    fue adquirida en un &aacute;rea sin resistencia significativa a las sulfonamidas    o doxiciclina (100 mg VO BID por 7 d&iacute;as). En embarazadas y ni&ntilde;os    menores de 8 a&ntilde;os la quinina puede combinarse con clindamicina 10 mg/Kg    (m&aacute;ximo 900 mg) cada 8 horas por 3-7 d&iacute;as.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; La quinina puede causar    sabor met&aacute;lico, tinnitus y p&eacute;rdida de la audici&oacute;n reversible.    La eficacia de los reg&iacute;menes a base de quinina es mayor al 90% en la    mayor&iacute;a de las &aacute;reas end&eacute;micas, excepto en el sureste asi&aacute;tico,    donde la resistencia es prevalente y el &iacute;ndice de cura es menor al 70%    (22-24).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; En pacientes que no toleran    la terapia oral o tienen parasitemia mayor del 5%, debe administrarse el siguiente    tratamiento: gluconato de quinidina intravenoso 10 mg/Kg en soluci&oacute;n    salina normal (m&aacute;ximo: 600 mg) en 1 a 2 horas, con infusi&oacute;n continua    a 0,02 mg/Kg/min, o clorhidrato de quinina intravenoso 20 mg sal/Kg en soluci&oacute;n    glucosada al 5% en 4 horas, seguido de 10 mg/Kg en 2 a 4 horas cada 8 horas    (m&aacute;ximo: 1800 mg/d&iacute;a).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; El gluconato de quinidina    es dos veces m&aacute;s malaricida, pero cuatro veces m&aacute;s cardiot&oacute;xico    que el clorhidrato de quinina; se requiere monitoreo card&iacute;aco durante    la terapia intravenosa con quinidina/quinina. En malaria por P. falciparum resistente    a quinina el tratamiento intravenoso debe hacerse con artemisinina IV combinada    con tetraciclina o mefloquina. Si no se dispone de artemisinina, debe administrarse    quinina/quinidina IV m&aacute;s tetraciclina. Los pacientes deben ser cambiados    a r&eacute;gimen oral tan pronto como toleren la misma.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Reg&iacute;menes alternativos:    En malaria por P. falciparum pueden usarse mefloquina, halofantrina, atovaquona,    artemisinina y pirimetamina-sulfadoxina como alternativas terap&eacute;uticas.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Pirimetamina-sulfadoxina (Fansidar&reg;): Se utiliza algunas veces en pa&iacute;ses en desarrollo por    su bajo costo; sin embargo, el incremento de la resistencia a los antifolatos    lo colocan como agente de segunda l&iacute;nea (11).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Mefloquina: Puede darse    dosis &uacute;nica de 25 mg base/Kg (m&aacute;ximo: 1.250 mg) o dividido en    dos dosis (15 mg base/Kg o 750 mg), seguido de 10 mg base/Kg o 500 mg 6 a 8    horas despu&eacute;s para mejorar la tolerancia. El f&aacute;rmaco cura 90 a    95% de la malaria por P. falciparum (25, 26). Puede producir v&oacute;mitos    y toxicidad neurol&oacute;gica, manifiesta en forma de mareos, delirio, ataxia    y convulsiones (27). La mefloquina no debe administrarse en ni&ntilde;os con    menos de 15 Kg de peso ni en pacientes que reciban quimioprofilaxis ni halofantrina,    para evitar la resistencia cruzada. Puede combinarse con doxiciclina, quinina    y derivados de la artemisinina.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Halofantrina: Se administra    a dosis de 8 mg sal/Kg (m&aacute;ximo: 500 mg) cada 6 horas por 3 dosis, y se    repite una semana despu&eacute;s. Se ha descrito curaci&oacute;n en el 65% de    los pacientes con malaria por P. falciparum resistente a cloroquina en Tailandia    y Africa (28). El f&aacute;rmaco tiene absorci&oacute;n oral variable, y se    ha asociado con toxicidad card&iacute;aca y arritmias; est&aacute; contraindicado    en enfermos con s&iacute;ndrome de QT prolongado, embarazadas y durante la lactancia.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Atovaquona: Es un inhibidor    selectivo del transporte electr&oacute;nico mitocondrial del par&aacute;sito.    Se combina frecuentemente con proguanil, ya que se ha demostrado sinergismo,    y adem&aacute;s se desarrolla resistencia r&aacute;pida si se administra sola.    Los estudios con la formulaci&oacute;n combinada (250 mg atovaquona/100 mg proguanil,    Malarone&reg; una vez al d&iacute;a por 3 d&iacute;as), llevados a cabo en el    sureste asi&aacute;tico, Sudam&eacute;rica y Africa reportan &iacute;ndices    de curaci&oacute;n del 95% en malaria falciparum sin efectos adversos severos    (29, 30). Trabajos recientes muestran una mayor eficacia de la combinaci&oacute;n    atovaquona-proguanil, en comparaci&oacute;n con cloroquina-pirimetamina-sulafadoxina    (31) y mefloquina (32).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Derivados de la artemisinina:    Son el tratamiento de elecci&oacute;n para P. falciparum resistente a quinina;    estos f&aacute;rmacos eliminan la parasitemia m&aacute;s r&aacute;pidamente    que la quinina, aunque la mayor&iacute;a de los ensayos cl&iacute;nicos que    comparan artemetero y quinina no han mostrado diferencias significativas en    la mortalidad entre ambas drogas para el tratamiento de la malaria severa (33-37).    Cuando se administran solos deben darse por 5 a 7 d&iacute;as (4 mg/Kg el primer    d&iacute;a, 2 mg/Kg los d&iacute;as 2 y 3, 1 mg/Kg los d&iacute;as 4 al 7),    pero, para evitar la recrudescencia que se observa cuando se da solo, deben    ser combinados preferiblemente con mefloquina, tetraciclina o clindamicina.    No hay evidencias de niveles altos de resistencia a la artemisinina y sus derivados,    ni se ha reportado toxicidad severa en humanos, aunque algunos estudios demuestran    neurotoxicidad en animales. A&uacute;n no se ha determinado la seguridad del    uso de estos compuestos durante el embarazo (38-45).</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Artemetero-benflumetol:    Esta combinaci&oacute;n (CGP 56697) ha mostrado un 96% de curaci&oacute;n en    malaria por P. falciparum en estudios cl&iacute;nicos realizados en China (46).    Otros ensayos, que comparan CGP 56697 versus mefloquina en 252 pacientes con    malaria falciparum en Tailandia, reportan s&oacute;lo un 69% de curaci&oacute;n    en el grupo CGP 56697, comparado con un 82% en el grupo tratado con mefloquina    (47). Se necesitan estudios m&aacute;s amplios y controlados, para determinar    el rol de esta formulaci&oacute;n combinada en el futuro.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Artemetero-lumefantrina (Coartem&reg;): Es una combinaci&oacute;n fija de artemetero (20 mg) y lumefantrina    (120 mg), con acci&oacute;n esquizonticida sangu&iacute;nea. La combinaci&oacute;n    es eficaz contra las cepas farmacorresistentes de P. falciparum, y los estudios    in vitro han demostrado el sinergismo de ambos componentes; los resultados de    los ensayos cl&iacute;nicos comparativos indican que la formulaci&oacute;n elimina    los gametocitos m&aacute;s r&aacute;pidamente que otros antimal&aacute;ricos    no artemisin&iacute;nicos.</font></p>     <p align="justify"><font face="Verdana" size="2">&nbsp;&nbsp;&nbsp; Otros tratamientos: En pacientes    con malaria grave o severa por P. falciparum, malaria cerebral y/o altos &iacute;ndices    de parasitemia, se han ensayado los siguientes tratamientos :</font></p>     <p align="justify"><font face="Verdana" size="2">o Exsanguino-transfusi&oacute;n    (48)    <br>   o Desferoxamina (49-51)    <br>   o Anticuerpos anti-TNFa (52)    <br>   o Esteroides (52)    <br>   Otras drogas que podr&iacute;an llegar a ser &uacute;tiles en la terapia antimal&aacute;rica    son:     <br>   o Macr&oacute;lidos (azitromicina) (53)    <br>   o Pironaridina    <br>   o Nuevos inhibidores de proteasas mal&aacute;ricas (54).</font></p>     ]]></body>
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