<?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>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132004000100012</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Uso de la vasopresina en el estado de choque]]></article-title>
<article-title xml:lang="en"><![CDATA[Vasopressin Use in Shock]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo-Esper]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Salazar]]></surname>
<given-names><![CDATA[Jorge A]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calvo-Carrillo]]></surname>
<given-names><![CDATA[Benjamín]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,PEMEX Hospital Central Sur Unidad de Terapia Intensiva]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Unidad de Terapia Intensiva  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<volume>140</volume>
<numero>1</numero>
<fpage>71</fpage>
<lpage>76</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132004000100012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132004000100012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132004000100012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La arginina-vasopresina (VP) también conocida como hormona antidiurética es esencial para mantener el equilibrio hídrico. Su síntesis y liberación depende de la interacción de estímulos osmóticos, hipovolémicos, hormonales y no osmóticos. Se ha demostrado que en estados de choque es fundamental para mantener la homeostasis cardiovascular a través de la regulación del tono vasomotor, el cual determina las resistencias vasculares sistémicas y la presión arterial media, a través de los receptores VI. El estado de choque con vasodilatación refractaria que se presenta en sepsis, respuesta inflamatoria sistémica, hipovolemia, paro cardiaco, politraumatismo, etc... se caracteriza por una fase inicial en la que hay liberación y aumento en los niveles séricos de VP, ésta es seguida por una segunda fase en la que se presentan niveles inapropiadamente bajos de la hormona y éstos se asocian con refractariedad al manejo con volumen, inotrópicos y vasopresores. Se ha demostrado, en estudios experimentales y clínicos, que en esta condición el tratamiento con vasopresina exógena incrementa la resistencia vascular sistémica, la presión de perfusión y el aporte de oxígeno a los tejidos periféricos lo cual hace posible la disminución y suspensión de los vasopresores e incrementa la supervivencia]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Arginine-vasopresin (VP), also known as the antidiuretic hormone, is essential for water homeostasis. Its synthesis and liberation depends on regulation of osmotic, hypovolemic, hormonal, and nonosmotic stimuli. It has been demonstrated that it is key for maintenance of cardiovascular homeostasis through vasomotor regulation, the determinant of systemic vascular resistance and mean arterial pressure, a process acting through VI receptors. Shock state with refractary vasodilation seen in sepsis, systemic inflamatory response, hypovolemia, cardiac arrest, polytrauma, etc., is characterized by an initial phase of liberation and increased levels of VP followed by a second phase caracterized by inappropirately low levels of this hormone that are associated with refractariness to management with volume, inotropics, and vasopressors. It has been demonstrated in clinical and experimental studies that exogenous VP treatment under this condition increases systemic vascular resistance, perfusion pressure, and oxygen supply to peripheral tissues, which makes it possible to decrease and to suspend vasopressors and also to increase survival.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Vasopresina]]></kwd>
<kwd lng="es"><![CDATA[choque refractario]]></kwd>
<kwd lng="es"><![CDATA[vasodilatación refractaria]]></kwd>
<kwd lng="es"><![CDATA[paro cardiaco]]></kwd>
<kwd lng="en"><![CDATA[Vasopressin]]></kwd>
<kwd lng="en"><![CDATA[refractary shock]]></kwd>
<kwd lng="en"><![CDATA[refractary vasodilatation states]]></kwd>
<kwd lng="en"><![CDATA[cardiac arrest]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culos de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Uso de la vasopresina en el estado de choque</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Vasopressin Use in Shock</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Ra&uacute;l Carrillo&#150;Esper,* Jorge A. Gonz&aacute;lez&#150;Salazar,** Benjam&iacute;n Calvo&#150;Carrillo**</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">* <i>Profesor titular de postgrado de Terapia Intensiva UNAM, Jefe de la Unidad de Terapia Intensiva. Hospital Central Sur de Alta Especialidad PEMEX.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Residentes de la Unidad de Terapia Intensiva.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>     <br>     <i>Hospital Central Sur de Alta Especialidad PEMEX     <br>     Picacho. Perif&eacute;rico Sur No. 4091.     <br>     M&eacute;xico, D.F.     <br> Tel y Fax: 56 45 16 84 Ext: 51155.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recepci&oacute;n versi&oacute;n modificada 04 de julio del 2002;     <br>   Aceptaci&oacute;n 17 de julio del 2002</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>La arginina&#150;vasopresina (VP) tambi&eacute;n conocida como hormona antidiur&eacute;tica es esencial para mantener el equilibrio h&iacute;drico. Su s&iacute;ntesis y liberaci&oacute;n depende de la interacci&oacute;n de est&iacute;mulos osm&oacute;ticos, hipovol&eacute;micos, hormonales y no osm&oacute;ticos. Se ha demostrado que en estados de choque es fundamental para mantener la homeostasis cardiovascular a trav&eacute;s de la regulaci&oacute;n del tono vasomotor, el cual determina las resistencias vasculares sist&eacute;micas y la presi&oacute;n arterial media, a trav&eacute;s de los receptores VI. El estado de choque con vasodilataci&oacute;n refractaria que se presenta en sepsis, respuesta inflamatoria sist&eacute;mica, hipovolemia, paro cardiaco, politraumatismo, etc... se caracteriza por una fase inicial en la que hay liberaci&oacute;n y aumento en los niveles s&eacute;ricos de VP, &eacute;sta es seguida por una segunda fase en la que se presentan niveles inapropiadamente bajos de la hormona y &eacute;stos se asocian con refractariedad al manejo con volumen, inotr&oacute;picos y vasopresores. Se ha demostrado, en estudios experimentales y cl&iacute;nicos, que en esta condici&oacute;n el tratamiento con vasopresina ex&oacute;gena incrementa la resistencia vascular sist&eacute;mica, la presi&oacute;n de perfusi&oacute;n y el aporte de ox&iacute;geno a los tejidos perif&eacute;ricos lo cual hace posible la disminuci&oacute;n y suspensi&oacute;n de los vasopresores e incrementa la supervivencia.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b><i>Vasopresina, choque refractario, vasodilataci&oacute;n refractaria, paro cardiaco</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Arginine&#150;vasopresin (VP), also known as the antidiuretic hormone, is essential for water homeostasis. Its synthesis and liberation depends on regulation of osmotic, hypovolemic, hormonal, and nonosmotic stimuli. It has been demonstrated that it is key for maintenance of cardiovascular homeostasis through vasomotor regulation, the determinant of systemic vascular resistance and mean arterial pressure, a process acting through VI receptors. Shock state with refractary vasodilation seen in sepsis, systemic inflamatory response, hypovolemia, cardiac arrest, polytrauma, etc., is characterized by an initial phase of liberation and increased levels of VP followed by a second phase caracterized by inappropirately low levels of this hormone that are associated with refractariness to management with volume, inotropics, and vasopressors. It has been demonstrated in clinical and experimental studies that exogenous VP treatment under this condition increases systemic vascular resistance, perfusion pressure, and oxygen supply to peripheral tissues, which makes it possible to decrease and to suspend vasopressors and also to increase survival.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b><i>Vasopressin, refractary shock, refractary vasodilatation states, cardiac arrest</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">La arginina&#150;vasopresina (VP) tambi&eacute;n conocida como hormona antidiur&eacute;tica es esencial para mantener el equilibrio h&iacute;drico y la estabilidad cardiovascular. En los &uacute;ltimos a&ntilde;os su aplicaci&oacute;n cl&iacute;nica se ha centrado en el manejo de la diabetes ins&iacute;pida y de la hemorragia por v&aacute;rices esof&aacute;gicas.</font></p>     <p align="justify"><font face="verdana" size="2">En 1971 Errington describi&oacute; la cin&eacute;tica de la VP en el choque hemorr&aacute;gico, a partir de entonces aparecieron en la literatura m&uacute;ltiples estudios relacionados con los cambios y efectos de la VP en el estado de choque. En 1997 Landry y col. propusieron su uso en el choque s&eacute;ptico refractario y en otros estados de choque asociados a vasodilataci&oacute;n como el que se presenta despu&eacute;s de la colocaci&oacute;n de un puente aortocoronario. Por los efectos vasculares de la VP y el incremento asociado en la perfusi&oacute;n coronaria, Wenzel y col. la propusieron como medicamento promisorio en la reanimaci&oacute;n cardiopulmonar.<sup>1&#150;3</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El objetivo del presente trabajo es dar a conocer a la comunidad m&eacute;dica las aplicaciones terap&eacute;uticas de la VP en el paciente cr&iacute;ticamente enfermo.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Fisiolog&iacute;a</b></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>S&iacute;ntesis y liberaci&oacute;n</i></b></font></p>     <p align="justify"><font face="verdana" size="2">La VP es un nonap&eacute;ptido con un puente disulfuro entre dos cisternas. El gen que codifica para la s&iacute;ntesis de VP est&aacute; constituido por tres exones y en el humano se localiza en el cromosoma 20.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se sintetiza en las neuronas magnocelulares localizadas en los n&uacute;cleos supra&oacute;ptico y para ventricular del hipot&aacute;lamo como pre&#150;prohormona la cual est&aacute; constituida por el nonap&eacute;ptido arginina vasopresina (AVP), neurofisina II, amino&aacute;cidos b&aacute;sicos, copeptina y un trip&eacute;ptido de uni&oacute;n. Es transportada del citoplasma al aparato de Golgi donde se almacena en granulos neurosecretorios. Ah&iacute; son separados los diferentes componentes y transportados v&iacute;a axonal a la hip&oacute;fisis posterior, en donde se almacenan. &Uacute;nicamente de 10&#150;20% de la hormona es liberada r&aacute;pidamente, despu&eacute;s se libera en pulsos lentos y continuos. El proceso completo de s&iacute;ntesis, transporte y almacenaje se lleva a cabo en una a dos horas.<sup>5,6</sup></font></p>     <p align="justify"><font face="verdana" size="2">La liberaci&oacute;n de la VP es secundaria a est&iacute;mulos osm&oacute;ticos, hipovol&eacute;micos, hormonales y no osm&oacute;ticos.<sup>7&#150;10</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Regulaci&oacute;n osm&oacute;tica</i></b></font></p>     <p align="justify"><font face="verdana" size="2">La hiperosmolaridad es uno de los est&iacute;mulos m&aacute;s potentes para la liberaci&oacute;n de VP. Es controlada por la activaci&oacute;n de osmorreceptores perif&eacute;ricos y centrales. Los osmorreceptores perif&eacute;ricos se encuentran localizados en la vena porta y responden de manera r&aacute;pida a los cambios osmolares inducidos por los alimentos y l&iacute;quidos ingeridos. Los osmorreceptores centrales se encuentran localizados en regiones cerebrales excluidas de la barrera hematoencef&aacute;lica detectan cambios de osmolaridad en margenes muy estrechos. La activaci&oacute;n de receptores por cambios osmolares induce despolarizaci&oacute;n de las neuronas magnocelulares de los n&uacute;cleos supra&oacute;ptico y paraventricular iniciando el proceso de transporte y liberaci&oacute;n de VP.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Regulaci&oacute;n hipovol&eacute;mica</i></b></font></p>     <p align="justify"><font face="verdana" size="2">La depleci&oacute;n de volumen intravascular y la hipotensi&oacute;n, estimulan la liberaci&oacute;n de VP a trav&eacute;s de la activaci&oacute;n de receptores de estiramiento que se encuentran localizados en aur&iacute;cula izquierda, ventr&iacute;culos, arco a&oacute;rtico y seno carot&iacute;deo. Los dos primeros registran los cambios de volumen y los segundos registran los de presi&oacute;n. La activaci&oacute;n de estos receptores adem&aacute;s de la liberaci&oacute;n de VP, inicia los mecanismos adren&eacute;rgicos, liberaci&oacute;n de renina y modulaci&oacute;n del p&eacute;ptido natriur&eacute;tico auricular con la finalidad de mantener estabilidad hemodin&aacute;mica.<sup>11&#150;13</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Regulaci&oacute;n hormonal</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Hay una serie de hormonas y mediadores que se liberan en el estado de choque y que estimulan o inhiben directamente la liberaci&oacute;n de VP. Los factores liberadores son: acetilcolina (v&iacute;a receptores nicot&iacute;nicos), histamina, nicotina, dopamina, prostaglandinas, angiotensina 11. La hipoxemia y la hipercapnia a trav&eacute;s de la estimulaci&oacute;n de quimiorreceptores localizados en el cuerpo carot&iacute;deo son potentes liberadores de VP.</font></p>     <p align="justify"><font face="verdana" size="2">Los inhibidores descritos hasta el momento son: opioides, &aacute;cido gamma&#150;amininobut&iacute;rico, p&eacute;ptido natriur&eacute;tico auricular.</font></p>     <p align="justify"><font face="verdana" size="2">El &oacute;xido n&iacute;trico (ON) es mediador de vasodilataci&oacute;n e hipotensi&oacute;n en choque s&eacute;ptico, adem&aacute;s tiene la capacidad de inhibir la liberaci&oacute;n de VP v&iacute;a AMPc.<sup>13</sup></font></p>     <p align="justify"><font face="verdana" size="2">La norepinefrina (NE) tiene acci&oacute;n bif&aacute;sica porque a trav&eacute;s de receptores alfa 1 o alfa 2 inhibe o estimula la secreci&oacute;n de VP.<sup>14,15</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Regulaci&oacute;n no osm&oacute;tica</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Dentro de &eacute;sta se incluyen al dolor, la n&aacute;usea, la acidosis y el estr&eacute;s emocional. La n&aacute;usea puede incrementar los niveles de VP, de 20 a 500 veces, y contribuye a la elevaci&oacute;n de &eacute;sta durante reacciones vasovagales, v&eacute;rtigo de movimiento, hiperemesis del embarazo, quimioterapia y cetoacidosis.<sup>16</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Metabolismo</b></font></p>     <p align="justify"><font face="verdana" size="2">Los niveles s&eacute;ricos normales de VP en estado de hidrataci&oacute;n adecuada son &lt; 4 pg/mL, mientras que la deprivaci&oacute;n de agua y el incremento de la osmolaridad plasm&aacute;tica se asocian a niveles de 10 pg/mL. La concentraci&oacute;n m&aacute;xima de orina se logra con niveles de VP de 20 pg/mL. Su vida media es de diez a treinta y cinco minutos y es metabolizada por vasopresinasas en h&iacute;gado y ri&ntilde;on.<sup>17</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Receptores de vasopresina</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Los receptores de vasopresina pertenecen a la superfamilia de receptores de prote&iacute;na G con siete dominios transmembrana. Se han descrito cuatro subtipos de receptores cuya localizaci&oacute;n, densidad y distribuci&oacute;n determinan los diferentes efectos fisiol&oacute;gicos. (<a href="/img/revistas/gmm/v140n1/a12c1.jpg" target="_blank">Cuadro I</a>).</font></p>     <p align="justify"><font face="verdana" size="2">Los receptores V1 se localizan en el endotelio vascular y median la vasoconstricci&oacute;n por activaci&oacute;n de fosfolipasa C y liberaci&oacute;n de calcio por la v&iacute;a de fosfoinositol. Los receptores V2 se localizan en t&uacute;bulos colectores renales y c&eacute;lulas endoteliales y median la retenci&oacute;n de agua y el efecto antidiur&eacute;tico de la VP a trav&eacute;s de la activaci&oacute;n de adenilato ciclasa y el incremento de AMP c&iacute;clico. Los receptores V3 tienen efectos centrales e incrementan los niveles de ACTH a trav&eacute;s de la activaci&oacute;n de diferentes prote&iacute;nas G. Los receptores de oxitocina (OTR) se localizan en &uacute;tero, mama, c&eacute;lulas endoteliales de vena umbilical, aorta y vena pulmonar. Su activaci&oacute;n induce la contracci&oacute;n uterina y participa en la respuesta vasodilatadora dependiente de calcio, mediante la estimulaci&oacute;n de &oacute;xido n&iacute;trico (ON).<sup>18,19</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><i>Efectos sist&eacute;micos</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Las acciones fisiol&oacute;gicas de la VP son las siguientes:</font></p>     <p align="justify"><font face="verdana" size="2">a Regula el metabolismo del agua mediante el aumento en la permeabilidad de los t&uacute;bulos colectores a trav&eacute;s de receptores V2, esto a su vez regula la retenci&oacute;n h&iacute;drica y su efecto antidiur&eacute;tico.</font></p>     <p align="justify"><font face="verdana" size="2">b Regula el tono vasomotor y de esta manera interviene en la estabilidad hemodin&aacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2">c     Favorece la liberaci&oacute;n de ACTH y cortisol.</font></p>     <p align="justify"><font face="verdana" size="2">d A trav&eacute;s de activaci&oacute;n de receptores V2 (agonista sint&eacute;tico 1 &#150;desamino&#150;8&#150;Darginina vasopresina) causa agregaci&oacute;n plaquetaria y liberaci&oacute;n del factor de Von&#150;Willebrand.</font></p>     <p align="justify"><font face="verdana" size="2">e A nivel cerebral act&uacute;a como neurotransmisor involucrado en: ritmos circadianos, ingesta de agua, regulaci&oacute;n cardiovascular, termorregulaci&oacute;n y nocicepci&oacute;n.<sup>20</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Vasopresina en el estado de choque</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El efecto antidiur&eacute;tico y la conservaci&oacute;n de agua constituye la funci&oacute;n m&aacute;s notable de la VP, pero tambi&eacute;n &eacute;sta participa en la homeostasis cardiovascular a trav&eacute;s de vasoconstricci&oacute;n, mantenimiento de resistencias vasculares sist&eacute;micas y presi&oacute;n arterial. Su efecto antidiur&eacute;tico se observa en m&aacute;rgenes de 1 &#150;7 pg/mL, y su efecto vasoconstrictor requiere de niveles de 10&#150;200 pg/ mL<sup>21,</sup><sup>22</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La VP es un potente vasoconstrictor en piel, m&uacute;sculo esquel&eacute;tico, grasa, p&aacute;ncreas y tiroides, y su efecto es menor en la circulaci&oacute;n mesent&eacute;rica, coronaria y cerebral, lo cual puede estar en relaci&oacute;n con su interacci&oacute;n con ON.</font></p>     <p align="justify"><font face="verdana" size="2">En condiciones fisiol&oacute;gicas la VP juega un papel menor en la regulaci&oacute;n de la presi&oacute;n arterial, pero durante el choque hemorr&aacute;gico o s&eacute;ptico es fundamental para mantener presi&oacute;n arterial. Lo anterior se ha demostrado en modelos experimentales de choque endot&oacute;xico en los cuales el pretratamiento con antagonistas espec&iacute;ficos de VP amplifica el efecto vasodilatador e hipotensor de la endotoxina, asimismo, el tratamiento con VP ex&oacute;gena incrementa la presi&oacute;n arterial y disminuye la mortalidad. Por otra parte, animales con diabetes ins&iacute;pida presentan mala respuesta a la hipotensi&oacute;n y a los estados de choque con elevada mortalidad.<sup>23&#150;28</sup></font></p>     <p align="justify"><font face="verdana" size="2">En el estado de choque la VP tiene una respuesta bif&aacute;sica. En la primera fase se presenta incremento en su liberaci&oacute;n con niveles s&eacute;ricos que var&iacute;an entre 100 a 1800 pg/mL, mientras que en la segunda fase los niveles s&eacute;ricos descienden progresivamente hasta 1&#150;12 pg/mL, lo cual se asocia a choque, vasodilataci&oacute;n refractaria e hipoperfusi&oacute;n coronaria. Se ha demostrado en m&uacute;ltiples estudios que esto se relaciona con mal pron&oacute;stico y falta de respuesta al manejo con l&iacute;quidos, inotr&oacute;picosy vasopresores.<sup>29&#150;34</sup></font></p>     <p align="justify"><font face="verdana" size="2">Este fen&oacute;meno se ha descrito en choque s&eacute;ptico, hemorr&aacute;gico, en donadores de &oacute;rganos con grave inestabilidad hemodin&aacute;mica y en estados de vasodilataci&oacute;n posteriores a la colocaci&oacute;n de un puente aorto&#150;coronario de un dispositivo de asistencia mec&aacute;nica&#150;ventricular. Esto sugiere que en estados de choque asociados a vasodilataci&oacute;n refractaria existe depleci&oacute;n relativa de VP o lo que tambi&eacute;n se ha denominado, niveles plasm&aacute;ticos inapropiadamente bajos, en los cuales a pesar de que se preserva la acci&oacute;n antidiur&eacute;tica se pierde el efecto modulador del tono vascular.<sup>34&#150;36</sup></font></p>     <p align="justify"><font face="verdana" size="2">La disminuci&oacute;n en los niveles s&eacute;ricos de VP que se presentan en los estados de choque ya descritos es de etiolog&iacute;a multifactorial: </font></p>     <p align="justify"><font face="verdana" size="2">a Depleci&oacute;n de VP en hip&oacute;fisis posterior secundaria </font><font face="verdana" size="2">a intensa estimulaci&oacute;n osm&oacute;tica y barorreceptora. </font></p>     <p align="justify"><font face="verdana" size="2">b Insuficiencia auton&oacute;mica con bloqueo de barorreceptores perif&eacute;ricos, lo cual se asocia a interferencia con la se&ntilde;al disparadora a nivel central, </font></p>     <p align="justify"><font face="verdana" size="2">c Los niveles s&eacute;ricos elevados de norepinefrina, ya sea como parte de la respuesta metab&oacute;lica al estado de choque o secundarios a su uso terap&eacute;utico, condicionan inhibici&oacute;n en la liberaci&oacute;n de VP a nivel central a trav&eacute;s de los receptores alfa 1. </font></p>     <p align="justify"><font face="verdana" size="2">d El incremento en la s&iacute;ntesis de ON por el endotelio vascular de la hip&oacute;fisis posterior con la subsecuente inhibici&oacute;n en la liberaci&oacute;n de VP, interfiere con su efecto vasopresor perif&eacute;rico. Dicho proceso se amplifica por la producci&oacute;n exagerada de ON a nivel sist&eacute;mico y por el efecto sin&eacute;rgico entre la hipoxia y los niveles bajos de VP sobre la apertura de los canales de K dependientes de ATP. (<a href="#f1">Figura 1</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v140n1/a12f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Uso terap&eacute;utico de la vasopresina en el estado de choque</i></b></font></p>     <p align="justify"><font face="verdana" size="2">La correcci&oacute;n de los niveles inapropiadamente bajos de VP mediante la aplicaci&oacute;n ex&oacute;gena de esta hormona se ha postulado como alternativa terap&eacute;utica en enfermos con choque y vasodilataci&oacute;n refractarias al empleo de volumen y vasopresores.</font></p>     <p align="justify"><font face="verdana" size="2">La VP ejerce su acci&oacute;n vasopresora en choque hipovol&eacute;mico &oacute; s&eacute;ptico en fase de vasodilataci&oacute;n aun en casos de resistencia a norepinefrina, angiotensina II y endotelina.<sup>37,</sup><sup>38</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los mecanismos involucrados en el efecto hemodin&aacute;mico de la VP en el estado de choque son:<sup>39&#150;46 </sup></font></p>     <p align="justify"><font face="verdana" size="2">a Las concentraciones inapropiadamente bajas de VP favorecen una mayor disponibilidad de receptores V1, de tal manera que aun a dosis bajas, la VP los ocupa y ejerce su acci&oacute;n vasoconstrictora, </font></p>     <p align="justify"><font face="verdana" size="2">b La VP potencia el efecto vasoconstrictor de la NE. </font></p>     <p align="justify"><font face="verdana" size="2">c La VP inhibe los canales de potasio (K) dependientes de ATP en el m&uacute;sculo liso vascular y por eso incrementa la disponibilidad de calcio celular necesario para la contracci&oacute;n del m&uacute;sculo liso, </font></p>     <p align="justify"><font face="verdana" size="2">d La VP bloquea al GMPc que es el segundo mensajero del ON, bloqueando as&iacute; su acci&oacute;n vasodilatadora, </font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">e La VP bloquea la s&iacute;ntesis de la sintetasa inducible de ON mediada por lipopolisac&aacute;rido y la liberaci&oacute;n de p&eacute;ptido natriur&eacute;tico auricular.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Ensayos cl&iacute;nicos</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El estado de estado de choque en fase de vasodilataci&oacute;n, refractaria a volumen, inotr&oacute;picos y vasopresores se caracteriza por un mal pron&oacute;stico. El estudio de Landry demostr&oacute; que la vasopresina es de utilidad en esta fase del estado de choque.</font></p>     <p align="justify"><font face="verdana" size="2">A partir de entonces y hasta 2001 se han publicado doce estudios cl&iacute;nicos que incluyen a 212 enfermos en estado de choque en fase de vasodilataci&oacute;n refractaria, de diferente etiolog&iacute;a (sepsis, respuesta inflamatoria sist&eacute;mica, postpuente aortocoronario, traumatismo, hipovolemia, secundario a inhibidores de la fosfodiesterasa y choque en pacientes pedi&aacute;tricos) que respondieron a la infusi&oacute;n de VP a dosis de 0.01 &#150;0.04 Ul/min. Los niveles s&eacute;ricos de VP oscilaban entre 2.9 a 20 pg/mL antes del tratamiento y una vez iniciada la infusi&oacute;n alcanzaron valores de 50 a 300 pg/mL.<sup>47&#150;55</sup> Estos estudios demostraron que el empleo de VP incrementa de manera significativa la resistencia vascular sist&eacute;mica y la presi&oacute;n de perfusi&oacute;n, y mejora el aporte de ox&iacute;geno a los tejidos perif&eacute;ricos, lo cual se asoci&oacute; con una disminuci&oacute;n significativa en la mortalidad en comparaci&oacute;n con grupos control que no recib&iacute;an VP. Se asocia con incremento en la diuresis, el cual est&aacute; en relaci&oacute;n con una mejor perfusi&oacute;n renal y del lecho espl&aacute;cnico, con el efecto natriur&eacute;tico y con la regulaci&oacute;n de la liberaci&oacute;n de otros mediadores como: p&eacute;ptido natriur&eacute;tico auricular, renina, angiotensina II y aldosterona.<sup>56</sup></font></p>     <p align="justify"><font face="verdana" size="2">La infusi&oacute;n de vasopresina debe mantenerse hasta lograr estabilidad hemodin&aacute;mica y disminuci&oacute;n en la dosis de las aminas vasoactivas. Algunos reportes mencionan que esto se logra en periodos de tiempo que van de 2 a 284 h. La vasopresina, debe suspenderse progresivamente, pues de lo contrario se puede volver a presentar el deterioro hemodin&aacute;mico.<sup>56,57</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las infusiones de vasopresina se asocian a vasoconstricci&oacute;n e isquemia renal, espl&aacute;cnica y coronaria. Esta complicaci&oacute;n se ha descrito en enfermos con hemorragia por v&aacute;rices esof&aacute;gicas en quienes se utilizaron dosis elevadas de VP, pero no se ha reportado en los casos en que se administr&oacute; en dosis bajas para el manejo del estado de choque con vasodilataci&oacute;n refractaria; sin embargo, se recomienda que durante su administraci&oacute;n se vigile estrechamente la perfusi&oacute;n coronaria y espl&aacute;cnica mediante monitoreo de la onda T y el segmento ST, enzimas cardiacas, pruebas de funcionamiento hep&aacute;tico, determinaci&oacute;n de azoatos, depuraci&oacute;n de creatinina y datos cl&iacute;nicos de isquemia intestinal.<sup>58</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Vasopresina en paro cardiaco</i></b></font></p>     <p align="justify"><font face="verdana" size="2">El paro cardiaco y la actividad el&eacute;ctrica sin pulsos se caracterizan por p&eacute;rdida del tono vascular perif&eacute;rico y estado de choque con vasodilataci&oacute;n, lo cual trae como consecuencia una mala distribuci&oacute;n del flujo sangu&iacute;neo e hipoperfusi&oacute;n coronaria. La epinefrina (E), por su efecto vasoconstrictor, es considerada el medicamento de elecci&oacute;n en los algoritmos de reanimaci&oacute;n, porque incrementa la resistencia vascular sist&eacute;mica y la perfusi&oacute;n coronaria.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En el paro cardiaco la VP presenta la misma din&aacute;mica que en los estados de choque comentados previamente, pueden presentarse niveles s&eacute;ricos inapropiadamente bajos para los requerimentos hemodin&aacute;micos. Por este motivo desde 1997 se postul&oacute; que la VP podr&iacute;a ser &uacute;til para las maniobras de reanimaci&oacute;n en paro cardiaco.</font></p>     <p align="justify"><font face="verdana" size="2">La utilidad de la VP durante el paro cardiaco se ha demostrado tanto en estudios animales como humanos, en &eacute;stos se ha observado que incrementa el flujo sangu&iacute;neo mioc&aacute;rdico y cerebral, y mejora la sobrevida.<sup>59&#150;62</sup></font></p>     <p align="justify"><font face="verdana" size="2">En estudios comparativos entre VP y E, se demostr&oacute; que aquellos pacientes que son manejados con VP tienen mejor respuesta a la reanimaci&oacute;n cardiopulmonar y una mayor supervivencia. Por lo anterior, en la actualidad la American Heart Association la recomienda como alternativa a la E en fibrilaci&oacute;n ventricular refractaria y como medicamento de rescate en aquellos enfermos en paro cardiaco a pesar del uso de dosis altas de E. Se requiere un mayor n&uacute;mero de estudios; sin embargo, la VP parece un medicamento promisorio que puede llegar a ser de primera elecci&oacute;n en las maniobras de reanimaci&oacute;n en paro cardiaco.<sup>63&#150;68</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">El choque refractario con vasodilataci&oacute;n es secundario a diferentes entidades y cursa con niveles inapropiadamente bajos de VP. La correcci&oacute;n de &eacute;stos con VP ex&oacute;gena, a dosis de 0.01&#150;0.04 Ul/min incrementa la resistencia vascular sist&eacute;mica y la presi&oacute;n de perfusi&oacute;n, lo cual mejora el aporte de ox&iacute;geno y la superviviencia de los enfermos.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1.<b> </b><b>Errington ML, Rocha M, Silva E Jr. </b>The secretion and clearance of vasopressin during the development of irreversible haemorrhagic shock. Proc  Physiol  Soc  1971; 23:43P&#150;45P.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3819771&pid=S0016-3813200400010001200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2.<b> Landry DW, Levin HR, Gallant EM, et al. </b>Vasopressin deficiency contributes to the vasodilation of septic shock. 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Physiol  Rev 1983; 63:1243&#150;1280.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3819777&pid=S0016-3813200400010001200007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">8.<b> Bourque CW, Oliet SH, Richard D. </b>Osmoreceptors, osmoreception and osmoregulation.  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