<?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>0034-7523</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[Rev cubana med]]></abbrev-journal-title>
<issn>0034-7523</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75232003000200008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ácidos grasos omega-3: pescados de carne azul y concentrados de aceites de pescado. Lo bueno y lo malo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nasiff-Hadad]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meriño-Ibarra]]></surname>
<given-names><![CDATA[Erardo]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Clinicoquirúrgico Hermanos Ameijeiras  ]]></institution>
<addr-line><![CDATA[Ciudad de La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2003</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<fpage>128</fpage>
<lpage>133</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75232003000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75232003000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75232003000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se hizo una revisión del efecto beneficioso y perjudicial de los ácidos grasos omega-3 en sujetos que padecen de diabetes mellitus, hipertensión arterial y dislipidemias y sus efectos sobre la hemostasia y otros órganos y sistemas. Se concluyó que la ingestión de pescados de carne azul 2 o 3 veces por semana, es una recomendación dietética para toda la población y que el consumo de aceites de pescado en dosis moderadas (hasta 3 g al día), es beneficioso para los diabéticos, hipertensos e hipertrigliceridémicos como tratamiento coadyuvante, que además disminuye la agregación plaquetaria y reduce la síntesis de mediadores químicos de la inflamación. Dosis elevadas de aceites de pescado pueden resultar perjudiciales sobre el control glucémico, la hipertensión arterial en personas susceptibles y los niveles séricos de lipoproteínas de baja densidad (LDL) y lipoproteínas de alta densidad (HDL).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[A review was made on the beneficial and detrimental effect of omega-3 fatty acids in subjects with diabetes mellitus, arterial hypertension and dislipidaemias, as well as on their effects on homeostasis and other organs and systems. It was concluded that the intake of blue meat fish 2 or 3 times a week is a dietary recommendation for the whole population and that the consumption of fish oil at moderate doses (up to 3g a day) is beneficial for patients suffering from diabetes, arterial hypertension and hypertriglyceridemia as a coadjuvant treatment. It also reduces platelet aggregation and the synthesis of the chemical mediators of inflammation. Elevated doses of fish oil may be harmful for glucemic control and arterial hypertension in sensitive persons and for the serum levels of low density lipoproteins (LDL) and high level lipoproteins (HDL).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ACIDOS GRASOS OMEGA-3]]></kwd>
<kwd lng="es"><![CDATA[DIABETES MELLITUS]]></kwd>
<kwd lng="es"><![CDATA[HIPERTENSION]]></kwd>
<kwd lng="es"><![CDATA[HIPERLIPIDEMIA]]></kwd>
<kwd lng="es"><![CDATA[ACEITES DE PESCADO]]></kwd>
<kwd lng="es"><![CDATA[DIETETICA]]></kwd>
<kwd lng="en"><![CDATA[FATTY ACIDS, OMEGA-3]]></kwd>
<kwd lng="en"><![CDATA[DIABETES MELLITUS]]></kwd>
<kwd lng="en"><![CDATA[HYPERTENSION]]></kwd>
<kwd lng="en"><![CDATA[HYPERLIPIDEMIA]]></kwd>
<kwd lng="en"><![CDATA[FISH OILS]]></kwd>
<kwd lng="en"><![CDATA[DIETETICS]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p>Hospital Clinicoquir&uacute;rgico &#147; Hermanos Ameijeiras&#148; </p> <h2>&Aacute;cidos grasos omega-3: pescados de carne azul y concentrados de aceites    de pescado. Lo bueno y lo malo</h2>     <p><i><a href="cargo">Dr. Alfredo Nasiff-Hadad<span class="superscript">1</span>    y Dr. Erardo Meri&ntilde;o-Ibarra<span class="superscript">2</span></a></i><a name="autor"></a>    <br> </p> <h4>Resumen</h4>     <p>Se hizo una revisi&oacute;n del efecto beneficioso y perjudicial de los &aacute;cidos    grasos omega-3 en sujetos que padecen de diabetes mellitus, hipertensi&oacute;n    arterial y dislipidemias y sus efectos sobre la hemostasia y otros &oacute;rganos    y sistemas. Se concluy&oacute; que la ingesti&oacute;n de pescados de carne    azul 2 o 3 veces por semana, es una recomendaci&oacute;n diet&eacute;tica para    toda la poblaci&oacute;n y que el consumo de aceites de pescado en dosis moderadas    (hasta 3 g al d&iacute;a), es beneficioso para los diab&eacute;ticos, hipertensos    e hipertriglicerid&eacute;micos como tratamiento coadyuvante, que adem&aacute;s    disminuye la agregaci&oacute;n plaquetaria y reduce la s&iacute;ntesis de mediadores    qu&iacute;micos de la inflamaci&oacute;n. Dosis elevadas de aceites de pescado    pueden resultar perjudiciales sobre el control gluc&eacute;mico, la hipertensi&oacute;n    arterial en personas susceptibles y los niveles s&eacute;ricos de lipoprote&iacute;nas    de baja densidad (LDL) y lipoprote&iacute;nas de alta densidad (HDL).</p>     <p><i>DeCS: </i>ACIDOS GRASOS OMEGA-3; DIABETES MELLITUS; HIPERTENSION; HIPERLIPIDEMIA;    ACEITES DE PESCADO; DIETETICA.    <br> </p>     <p>    <br>   Las grasas constituyen uno de los componentes m&aacute;s importantes del reino    animal y vegetal. Dentro del reino animal se les encuentra formando grandes    vacuolas en el citoplasma de las c&eacute;lulas adiposas localizadas en el tejido    subcut&aacute;neo y visceral, y en el reino vegetal, en las semillas y flores    de numerosas plantas.</p>     <p>En el hombre sirven como fuentes de energ&iacute;a y se distribuyen en 3 regiones    del cuerpo; la gluteofemoral, la subcut&aacute;nea y la intrabdominal, esta    &uacute;ltima caracteriza a la obesidad como factor de riesgo de enfermedades    cardiovasculares.<span class="superscript">1-3 </span></p>     <p>Las grasas est&aacute;n compuestas por monoglic&eacute;ridos, diglic&eacute;ridos    y triglic&eacute;ridos y estos a su vez est&aacute;n constituidos por una mol&eacute;cula    de glicerol a la que se unen 1, 2 o 3 &aacute;cidos grasos (AG). Los fosfol&iacute;pidos    y los &eacute;steres del colesterol tambi&eacute;n contienen AG.</p>     ]]></body>
<body><![CDATA[<p>Los AG son un grupo de compuestos org&aacute;nicos formados por una cadena    hidrocarbonada y un grupo carbox&iacute;lico que son los que les confieren las    propiedades f&iacute;sico-qu&iacute;micas a las grasas.</p>     <p>Los AG presentes en los seres vivos poseen en su mayor&iacute;a un n&uacute;mero    par de &aacute;tomos de carbono y se clasifican en: saturados, cuando no tienen    dobles enlaces e insaturados, cuando tienen dobles enlaces, estos &uacute;ltimos    pueden ser monoinsaturados o poliinsaturados, seg&uacute;n presenten uno o varios    dobles enlaces.</p>     <p>Clasificaci&oacute;n de los AG saturados, seg&uacute;n el n&uacute;mero de    &aacute;tomos de carbono <span class="superscript">4</span></p>     <p>&Aacute;cidos grasos &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;N&uacute;mero    de &aacute;tomos de carbono    <br>   &middot; De cadena corta &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Entre    4 y 6     <br>   &middot; De cadena media &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Entre    8 y 10     <br>   &middot; De cadena larga &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Entre    12 y 18     <br>   &middot; De cadena muy larga &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Entre    20 y 24</p>     <p>    <br>   <b>&Aacute;cidos grasos insaturados</b></p>     ]]></body>
<body><![CDATA[<p>Los AG insaturados pueden ser clasificados de varias maneras. La de mayor utilidad    por su significaci&oacute;n patog&eacute;nica en la aterosclerosis es aquella    que los agrupa por el n&uacute;mero del carbono donde se ubica el primer doble    enlace, antecedido por la letra griega omega (<font face="Symbol">w</font>).    As&iacute; se identifican los AG omega-9 (<font face="Symbol">w</font>9) como    el oleico presente en grasas vegetales y animales, los omega-6 (<font face="Symbol">w</font>6),    cuyo principal representante es el linoleico presente en los aceites vegetales,    y los omega-3 (<font face="Symbol">w</font>3) cuyo AG principal es el <font face="Symbol">a</font>-linol&eacute;nico    presente en los aceites marinos y en algunos aceites vegetales.<span class="superscript">5    </span></p>     <p>Los AG insaturados pueden ser cis o trans, en dependencia de la configuraci&oacute;n    espacial que adopten. La forma cis se produce cuando los 2 carbonos del doble    enlace se sit&uacute;an espacialmente del mismo lado y los trans cuando los    carbonos est&aacute;n situados en direcci&oacute;n opuesta.<span class="superscript">6</span></p>     <p>Los AG trans se conforman como consecuencia del calentamiento o la hidrogenaci&oacute;n    de los AG y ostentan el mismo poder aterog&eacute;nico que los AG saturados.    Las margarinas obtenidas por hidrogenaci&oacute;n de aceites vegetales o marinos    pueden contener AG trans, condici&oacute;n que debe aparecer en las etiquetas    de los envases de estos productos. Los AG cis no son aterog&eacute;nicos.<span class="superscript">7</span></p>     <p>    <br>   <b>&Aacute;cidos grasos omega-3</b></p>     <p>El &aacute;cido <font face="Symbol">a</font>-linol&eacute;nico (<font face="Symbol">w</font>3)    no puede obtenerse de la dieta, pero de &eacute;l derivan los &aacute;cidos    eicosapentaenoico (EPA) y docosahexaenoico (DHA) que se encuentran en los pescados    de aguas profundas llamados pescados de carne azul.<span class="superscript">8</span>    Las especies m&aacute;s ricas en AG <font face="Symbol">w</font>-3 (EPA/DHA)    por cada 100 g de pescado crudo son: 9 sardina - 3,3 g; macarela -2,5; arenque-    1,7; anchoa- 1,4; salm&oacute;n- 1,4 y sable -1,4.</p>     <p>Los concentrados de aceites de pescado con mayor contenido en EPA/DHA por cada    100g de aceite son: promega- 44,2 g; MaxEPA&#150;29,4; aceite de salm&oacute;n    &#150;19,9; aceite de h&iacute;gado de bacalao &#150; 18,5 y aceite de arenque    &#150;11,4.<span class="superscript">9</span></p>     <p>El consumo de pescados de carne azul disminuye la incidencia de cardiopat&iacute;a    isqu&eacute;mica.<span class="superscript">10</span> <i>Dyerberg</i> fue el    primero en reportar esta asociaci&oacute;n tras sus observaciones de los esquimales,    quienes ingieren en promedio 7 g/d de EPA, mientras los daneses consumen menos    de 0,1 g/d. La prevalencia de cardiopat&iacute;a isqu&eacute;mica en los esquimales    es la quinta parte de la de los daneses.<span class="superscript">8,11 </span>  </p>     <p>Desde entonces se ha recomendado incrementar el uso de pescado en la dieta    en sustituci&oacute;n de las carnes rojas. Sin embargo, la multiplicidad de    cambios producidos por los AG w -3 en el metabolismo lip&iacute;dico y gluc&iacute;dico,    en las funciones de las membranas celulares, en los mecanismos trombog&eacute;nicos    y en la respuesta inmune e inflamatoria<span class="superscript">12</span> han    hecho necesario revisar el balance beneficio-perjuicio que estas sustancias    pudieran provocar y establecer recomendaciones dentro de las estrategias propuestas    para reducir la morbilidad y la mortalidad por enfermedades cardiovasculares.</p>     <p>    ]]></body>
<body><![CDATA[<br>   <b>&Aacute;cidos grasos omega-3 en la diabetes</b></p>     <p>La relaci&oacute;n entre diabetes mellitus y aceites de pescado fue se&ntilde;alada    por<i> Sagild</i> y otros<span class="superscript">13</span> y por <i>Kromann</i>    y otros,<span class="superscript">14</span> quienes observaron en los esquimales    una menor incidencia de cardiopat&iacute;a isqu&eacute;mica y diabetes que en    la poblaci&oacute;n danesa. Por otra parte, han suscitado gran inter&eacute;s    los efectos de los AG <font face="Symbol">w</font>-3 en los diab&eacute;ticos    porque esta enfermedad se asocia frecuentemente a dislipidemias y a un mayor    riesgo de aterosclerosis, con frecuencia se prescriben los &aacute;cidos grasos    <font face="Symbol">w</font> 3 en la diabetes y las dislipidemias. </p>     <p>Se han reportado m&uacute;ltiples investigaciones en diab&eacute;ticos y no    diab&eacute;ticos, en las cuales se ha evaluado el efecto que los AG <font face="Symbol">w</font>-3    producen sobre la glucemia. Aunque no todos los resultados concuerdan, existe    en la actualidad suficiente informaci&oacute;n para hacer algunas consideraciones.</p>     <p><i>Glauber</i> y otros<span class="superscript">15</span> reportan en 6 hombres    de edad media con diabetes tipo 2, efectos delet&eacute;reos sobre el control    gluc&eacute;mico despu&eacute;s de 1 mes de la administraci&oacute;n suplementaria    de 5,5g de AG <font face="Symbol">w</font>-3 en forma de aceite de pescado concentrado    (MaxEpa). Resultados similares han sido reportados por <i>Friday</i> y otros.<span class="superscript">16</span>    En un estudio comparativo con gliburide en diab&eacute;ticos tipo 2, los 8g    diarios de AG <font face="Symbol">w</font>-3 durante 4sem incrementaron significativamente    la glucemia en ayunas.<span class="superscript">17</span> En un interesante    meta-an&aacute;lisis de 26 estudios publicados entre los a&ntilde;os 1984 y    1993, <i>Friedberg</i> y otros,<span class="superscript">18</span> encuentran    en diab&eacute;ticos tipo 1 disminuci&oacute;n significativa de la glucemia    en ayunas, mientras en diab&eacute;ticos tipo 2, una ligera elevaci&oacute;n    estad&iacute;sticamente no significativa. Estos autores estiman que en las revisiones    del tema se tiende a exagerar los efectos adversos de la administraci&oacute;n    de aceites de pescado sobre el control gluc&eacute;mico. En este meta-an&aacute;lisis    se recogen ensayos muy variables en n&uacute;mero de pacientes, duraci&oacute;n    del tratamiento y dosis diaria de EPA/DHA. Estos resultados han sido confirmados    en 2 recientes ensayos aleatorizados, a doble ciegas y controlado con grupo    placebo.<span class="superscript">19,20</span></p>     <p><i>Eslandrit </i>y otros reportan en 28 individuos hipertriglicerid&eacute;micos    no diab&eacute;ticos sometidos a <i>by-pass</i> coronario, menor reducci&oacute;n    de la glucemia en ayunas en el grupo tratado con 3,4 g/d de AG <font face="Symbol">w</font>-3    durante 6 meses, que en el grupo control.<span class="superscript">21</span>    En otro ensayo efectuado en sujetos no diab&eacute;ticos con hiperlipidemia    combinada, tratados con 3,4 g/d no se afect&oacute; la glucemia, la insulinemia    ni la proinsulinemia en ayunas en relaci&oacute;n con los valores basales.<span class="superscript">22</span></p>     <p>El efecto de los AG <font face="Symbol">w</font>-3 en la insulinorresistencia    fue evaluado por <i>Rivellese </i>y otros,<span class="superscript">23</span>    quienes reportan no deterioro del control gluc&eacute;mico ni mejor&iacute;a    de la resistencia a la insulina en diab&eacute;ticos tipo 2 que recibieron 2,7    g/d de EPA/DHA; <i>Berry</i><span class="superscript">24 </span>concuerda con    eso y a&ntilde;ade que neutraliza la hipertrigliceridemia, la hipertensi&oacute;n    y la ganancia de peso asociadas a este s&iacute;ndrome. Resultados similares    obtienen <i>Fasching</i> y otros con la administraci&oacute;n diaria de 3,8/2,5    g de EPA/DHA.<span class="superscript">25</span> Dos estudios recientes corroboran    estos resultados.<span class="superscript">26,27</span> Los AG <font face="Symbol">w</font>    -3 no modifican la sensibilidad de los tejidos perif&eacute;ricos a la insulina,    pero inhiben la gluotrosisis<span class="superscript">15,28</span> y la secreci&oacute;n    de insulina10 y aumentan la producci&oacute;n hep&aacute;tica de glucosa.<span class="superscript">15,28    </span>Tambi&eacute;n se ha se&ntilde;alado que los aceites de pescado pueden    aliviar los efectos negativos que producen los productos finales de la glucosilaci&oacute;n    avanzada sobre la relajaci&oacute;n del endotelio, mediada por el &oacute;xido    n&iacute;trico.<span class="superscript">21</span></p>     <p>La administraci&oacute;n de concentrados de aceites de pescado (EPA/DHA) como    suplemento diet&eacute;tico en los diab&eacute;ticos depender&aacute; de la    dosis diaria del mismo,<span class="superscript">5,29 </span>se ha se&ntilde;alado    que dosis elevadas (7,5 g/d) elevan la glucosa en ayunas mientras dosis bajas    (4g/d) no la modifican,<span class="superscript">5,29</span> mientras hay quienes    proponen su uso s&oacute;lo en diab&eacute;ticos con hipertrigli-ceridemia.24    La Asociaci&oacute;n Americana de Diabetes<span class="superscript">30</span>    recomienda que el concentrado de aceite de pescado en la dieta de los pacientes    diab&eacute;ticos con severa hipertrigliceridemia debe hacerse con supervisi&oacute;n    m&eacute;dica y diet&eacute;tica y no debe establecerse como una recomendaci&oacute;n    a diab&eacute;ticos en general. </p>     <p>En resumen, el consumo de pescado fresco se recomienda en la preparaci&oacute;n    de una dieta antiaterog&eacute;nica, tanto en diab&eacute;ticos como en no diab&eacute;ticos    y no deben extrapolarse sus beneficios a la administraci&oacute;n de concentrados    de EPA/DHA, estos estar&aacute;n indicados preferiblemente en diab&eacute;ticos    hipertriglicerid&eacute;micos, sin estar formalmente excluidos de sus beneficios    los diab&eacute;ticos no hipertriglicerid&eacute;micos, en dosis no mayores    de 3 g diarios 18 y bajo control de la glucemia en ayunas.<span class="superscript">31,32</span></p>     <p>    <br>   <b>&Aacute;cidos grasos omega 3 y l&iacute;pidos plasm&aacute;ticos</b></p>     ]]></body>
<body><![CDATA[<p>Desde los estudios de <i>Kinsell </i>y otros, <i>Keys</i> y otros y <i>Ahrens</i>    y otros 33 se conoce la influencia que el tipo de grasa de la dieta produce    sobre el otrosesterol plasm&aacute;tico, no as&iacute; sobre las lipoprote&iacute;nas.    Sin embargo, el efecto de los AG <font face="Symbol">w</font> -3 sobre los l&iacute;pidos    y lipoprote&iacute;nas plasm&aacute;ticas adquiri&oacute; relevancia a partir    de los trabajos de Dyerberg en los esquimales a quienes encontr&oacute; niveles    de otrosesterol y triglic&eacute;ridos del 20 y 60%, respectivamente menores    que en los daneses, y lo relacion&oacute; con la marcada diferencia en el consumo    diet&eacute;tico de pescado.<span class="superscript">8,11</span></p>     <p>Los AG <font face="Symbol">w</font>-3 disminuyen las lipoprote&iacute;nas de    muy baja densidad (VLDLc) y los triglic&eacute;ridos del plasma<span class="superscript">21,34</span>    tanto en sujetos normales<span class="superscript">35</span> como en los hipertriglicerid&eacute;micos<span class="superscript">21,34</span>    y suprimen la lipemia posprandial representada por los quilomicrones remanentes,<span class="superscript">34</span>    tanto para las dietas ricas en grasa como para las ricas en carbohidratos,<span class="superscript">36</span>    consideradas aterog&eacute;nicas. Los efectos sobre las lipoprote&iacute;nas    de baja densidad (LDLc) y las lipoprote&iacute;nas de alta densidad (HDLc) son    variables. La HDLc generalmente no cambia.<span class="superscript">34</span>    Este efecto es dosis dependiente en relaci&oacute;n con los TG y con las VLDLc.5    Se han reportado incrementos de la HDL a expensas de la fracci&oacute;n HDL2    .<span class="superscript">37</span></p>     <p>La reducci&oacute;n de la hipertrigliceridemia ser&aacute; mayor, cuanto mayor    sea el nivel basal de triglic&eacute;ridos,<span class="superscript">34,38</span>    tanto cuando se administran dosis bajas de AG <font face="Symbol">w</font>-3    durante largo tiempo como cuando se ofrece una dosis &uacute;nica muy alta.38    Por otra parte se ha reportado reducci&oacute;n de lipoprote&iacute;na(<font face="Symbol">a</font>)    [Lp(<font face="Symbol">a</font>)] en pacientes sometidos a dieta rica en AG    <font face="Symbol">w</font> -3 durante 6 meses.<span class="superscript">39,40</span></p>     <p>El mecanismo por el cual los AG <font face="Symbol">w</font>-3 reducen la hipertrigliceridemia    es m&uacute;ltiple: la reducci&oacute;n de la s&iacute;nteis hep&aacute;tica    de TG,<span class="superscript">34,41</span> incremento de su aclaramiento plasm&aacute;tico<span class="superscript">34</span>    y a trav&eacute;s de los receptores activadores de la proliferaci&oacute;n de    peroxisomas (PPAR).<span class="superscript">42,43</span> La ligera elevaci&oacute;n    de las LDL con AG <font face="Symbol">w</font>-3 parece estar relacionado con    la m&aacute;s r&aacute;pida convertibilidad de las VLDLc a LDLc, lo que ha sido    probado en cerdos peque&ntilde;os, pero no en seres humanos.<span class="superscript">34    </span>Aparentemente, los AG <font face="Symbol">w</font>-3 producen una part&iacute;cula    de VLDL m&aacute;s peque&ntilde;a que es m&aacute;s susceptible de convertirse    en LDLc.<span class="superscript">34</span> No se conoce el mecanismo por el    cual ocurre la reducci&oacute;n o no modificaci&oacute;n de las HDLc<span class="superscript">38</span>    y se sugiere que, en parte, depende de la dosis, la reducci&oacute;n es mayor    a dosis mayores.<span class="superscript">44</span></p>     <p>    <br>   <b>&Aacute;cidos grasos omega-3 en la hipertensi&oacute;n arterial</b></p>     <p>Los efectos de los AG <font face="Symbol">w</font>-3 en pacientes hipertensos    han sido estudiados en varios ensayos cl&iacute;nicos<span class="superscript">45-49</span>    en los que se han observado reducciones de la presi&oacute;n arterial, tanto    la sist&oacute;lica<span class="superscript">45,47,48</span> como la diast&oacute;lica    47,48 y la presi&oacute;n arterial media,49 se han utilizado tanto concentrados    de EPA/DHA<span class="superscript">45-48</span> en dosis entre 3 y 4g diarios    como con raciones de pescado,<span class="superscript">49</span> en per&iacute;odos    que oscilaron entre 4 sem y 1 a&ntilde;o. Se han administrado dosis m&aacute;s    altas (6,6g/d) sin observarse efectos sobre el di&aacute;metro luminal y el    porcentaje de estenosis medido por angiograf&iacute;a coronaria.<span class="superscript">32</span></p>     <p>Aunque los AG <font face="Symbol">w</font>-3 reducen la presi&oacute;n arterial    moderada, en ocasiones s&oacute;lo asociados a cambios en el estilo de vida,<span class="superscript">50</span>    se ha se&ntilde;alado que en algunos individuos aumenta el riesgo de apoplej&iacute;a    por hipertensi&oacute;n arterial por el consumo de aceites de pescado concentrados,    provocado por una respuesta vasopresora exagerada mediada por catecolaminas.<span class="superscript">51    </span> </p>     <p>En los meta-an&aacute;lisis de <i>Apple </i>y otros<span class="superscript">52    </span>y <i>Morris </i>y otros,<span class="superscript">53</span> en los que    se agruparon 17 y 31 ensayos, respectivamente, estos autores concluyeron que    el suplemento diet&eacute;tico con AG <font face="Symbol">w</font>-3 tiene un    efecto hipotensor en pacientes hipertensos. Ellos encontraron que la reducci&oacute;n    de la tensi&oacute;n arterial puede ser en el orden de &#150;3/&#150;1,5 (TAS/TAD),    en uno de ellos observaron un efecto dosis-respuesta con reducciones de &#150;1,3/&#150;0,7    con dosis &lt;3g/d, &#150;2,9/&#150;1,6 con dosis de 3,3&#150;7g/d y &#150;8,1/&#150;5,8    con dosis de 15g/d.<span class="superscript">53 </span></p>     <p>Se ha sugerido que el aceite de pescado produce incremento de la compliance    arterial y de la respuesta de los barorreceptores, adem&aacute;s de una mayor    producci&oacute;n de eicosanoides vasodilatadores y antiagregantes.<span class="superscript">54</span></p>     ]]></body>
<body><![CDATA[<p>Los AG<font face="Symbol"> w</font> -3, contenidos en los concentrados de aceites    de pescado, pueden usarse en dosis menores de 3g diarios como terap&eacute;utica    coadyuvante a los f&aacute;rmacos hipotensores para reducir los niveles de presi&oacute;n    arterial en personas hipertensas. Aunque el incremento diet&eacute;tico del    pescado de carne azul supera estos beneficios.</p>     <p>    <br>   <b>&Aacute;cidos grasos omega-3 en la hemostasia</b></p>     <p>Un estudio que involucr&oacute; m&aacute;s de 15 000 participantes, evalu&oacute;    el efecto de los <font face="Symbol">w</font> 3 sobre varios factores hemost&aacute;ticos    y encontr&oacute; una relaci&oacute;n inversa entre el consumo y el fibrin&oacute;geno,    factor VIII y factor de Von Willebrand y asociaci&oacute;n positiva con la prote&iacute;na    C reactiva,<span class="superscript">55 </span>sin embargo, en otro estudio    de 120 pacientes con claudicaci&oacute;n intermitente seguidos por 2 a&ntilde;os    no se encontr&oacute; diferencia entre los grupos que usaron w 3 y placebo con    respecto a la viscosidad plasm&aacute;tica, hemat&oacute;crito, fibrin&oacute;geno,    d&iacute;mero D y factor de <i>Von Willebrand</i>.<span class="superscript">56    </span>El efecto mejor demostrado de los w 3 en la hemostasia, es como antiagregante    plaquetario. Parece claro que una die ta rica en w 3 modula la respuesta vascular    y plaquetaria ante da&ntilde;os bioqu&iacute;micos o f&iacute;sicos y disminuye    la agregaci&oacute;n de estas &uacute;ltimas por varios mecanismos: modulaci&oacute;n    de la s&iacute;ntesis de prostaglandina plaquetaria, inhibici&oacute;n de la    respuesta proliferativa vascular mediada por macr&oacute;fagos o citoquinas    e incrementa la actividad del factor relajante del endotelio, todo esto b&aacute;sicamente    por la sustituci&oacute;n de &aacute;cido araquid&oacute;nico por EPA y DHA    en los fosfol&iacute;pidos de membrana.<span class="superscript">57</span></p>     <p>No hubo diferencias en la actividad del inhibidor del activador del plasmin&oacute;geno-1    (PAI-1) entre individuos que consumieron w 3 y los que consumieron placebo,    en un estudio realizado con 224 hombres de edad media no fumadores y saludables.    En una revisi&oacute;n de 17 estudios que incluyeron 935 participantes, s&oacute;lo    en 2 de ellos se demostr&oacute; aumento de la actividad del PAI-1 atribuible    al suplemento de w 3, por lo que no hay evidencias concluyentes de un efecto    desfavorable al respecto.<span class="superscript">58</span></p>     <p>Por tanto, con el suplemento parece haber una reducci&oacute;n de algunos factores    hemost&aacute;ticos y de la actividad protromb&oacute;tica del plasma; sin embargo,    se ha detectado un incremento de la actividad proinflamatoria expresada por    aumento de las mol&eacute;culas de adhesi&oacute;n e-selectina y la mol&eacute;cula    de adhesi&oacute;n celular vascular-1, resultado del incremento de la peroxidaci&oacute;n    lip&iacute;dica, as&iacute; como tambi&eacute;n se ha comprobado incremento    de la IL6 y TNF-alfa, lo cual aumenta la actividad proinflamatoria.<span class="superscript">59</span>    No se han encontrado efectos diferentes de los<font face="Symbol"> w</font>    -3 sobre el factor VII60 y la homociste&iacute;na61 entre grupos con <font face="Symbol">w</font>    -3 y placebo.</p>     <p>    <br>   <b>Otros efectos de los &aacute;cidos grasos omega-3</b>    <br>       <br>   A los &aacute;cidos grasos <font face="Symbol">w</font>-3 se les han atribuido    efectos antiarr&iacute;tmicos62 porque indicados a cardi&oacute;patas se reduce    el riesgo de paro card&iacute;aco.<span class="superscript">8</span> Por otra    parte, su consumo disminuye el riesgo de c&aacute;ncer de mama y colon.<span class="superscript">63</span>    Se ha observado un incremento de la actividad de aminotransferasa s&eacute;rica    durante el suplemento de aceites de pescado<span class="superscript">63</span>    as&iacute; como efecto antiinflamatorio de las v&iacute;as a&eacute;reas.<span class="superscript">64</span>    Se relacionan con la aterosclerosis no s&oacute;lo por las modificaciones que    producen sobre las lipoprote&iacute;nas del plasma, sino que lo hacen adem&aacute;s    mediante otros factores que intervienen en los cambios estructurales que ocurren    en la pared arterial como en las citoquinas, los leucotrienos, los factores    activadores y los relajantes, radicales libres y otros.<span class="superscript">65</span></p>     ]]></body>
<body><![CDATA[<p>En conclusi&oacute;n, la ingesti&oacute;n de pescados de carne azul constituye    una recomendaci&oacute;n diet&eacute;tica tanto para la poblaci&oacute;n general    como para quienes padecen de hipertensi&oacute;n arterial, diabetes mellitus    y dislipidemias. El consumo de concentrados de aceites de pescado que contienen    hasta 3g diarios EPA/DHA, mejora la hipertrigliceridemia de los diab&eacute;ticos    y la de los no diab&eacute;ticos y reduce la hipertensi&oacute;n arterial sist&oacute;lica    y diast&oacute;lica en hipertensos. El consumo de altas concentraciones de EPA/DHA    por un largo per&iacute;odo puede conducir a hipervitaminosis A o D, as&iacute;    como elevar la glucemia en diab&eacute;ticos, la presi&oacute;n arterial en    hipertensos susceptibles y las LDLc. Adicionalmente, los AG<font face="Symbol">    w</font> -3 disminuyen la agregaci&oacute;n plaquetaria y reducen la s&iacute;ntesis    de mediadores qu&iacute;micos de la inflamaci&oacute;n que intervienen en la    formaci&oacute;n de la placa de ateroma. Por tanto se recomienda primero, el    consumo de pescados de carne azul 2 o 3 veces por semana en sustituci&oacute;n    de alimentos que contienen grasas saturadas y la administraci&oacute;n de concentrados    de aceites de pescado puede indicarse s&oacute;lo a dosis bajas.    <br> </p> <h4> Summary </h4>     <p>A review was made on the beneficial and detrimental effect of omega-3 fatty    acids in subjects with diabetes mellitus, arterial hypertension and dislipidaemias,    as well as on their effects on homeostasis and other organs and systems. It    was concluded that the intake of blue meat fish 2 or 3 times a week is a dietary    recommendation for the whole population and that the consumption of fish oil    at moderate doses (up to 3g a day) is beneficial for patients suffering from    diabetes, arterial hypertension and hypertriglyceridemia as a coadjuvant treatment.    It also reduces platelet aggregation and the synthesis of the chemical mediators    of inflammation. Elevated doses of fish oil may be harmful for glucemic control    and arterial hypertension in sensitive persons and for the serum levels of low    density lipoproteins (LDL) and high level lipoproteins (HDL). </p>     <p><i>Subject headings:</i> FATTY ACIDS, OMEGA-3; DIABETES MELLITUS; HYPERTENSION;    HYPERLIPIDEMIA; FISH OILS; DIETETICS.</p>     <p></p> <h4>Referencias bibliogr&aacute;ficas </h4> <ol>       <!-- ref --><li> Azevedo A, Ramos E, von Hafe P, Barros H. Upper-body adiposity and risk      of myocardial infarction. 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