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<front>
<journal-meta>
<journal-id>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402007000500008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Manejo médico y quirúrgico del cardiópata en edad pediátrica con insuficiencia cardíaca]]></article-title>
<article-title xml:lang="en"><![CDATA[Medical and surgical treatment in the pediatric patient with heart failure]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buendía Hernández]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calderón Colmenero]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zabal Cerdeira]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Marroquín]]></surname>
<given-names><![CDATA[Edgar Samuel]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes Salazar]]></surname>
<given-names><![CDATA[Jorge Luis]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Attie Cury]]></surname>
<given-names><![CDATA[Fause]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A">
<institution><![CDATA[,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2007</year>
</pub-date>
<volume>77</volume>
<fpage>54</fpage>
<lpage>60</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402007000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402007000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402007000500008&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>6. Manejo m&eacute;dico y quir&uacute;rgico del  cardi&oacute;pata en edad pedi&aacute;trica con insuficiencia card&iacute;aca</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>6. Medical and surgical treatment in the pediatric patient with heart failure</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Alfonso Buend&iacute;a Hern&aacute;ndez, Juan Calder&oacute;n Colmenero,  Carlos Zabal Cerdeira, Edgar Samuel Ram&iacute;rez Marroqu&iacute;n, Jorge Luis Cervantes Salazar,  Fause Attie Cury</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INC 1 Medidas  generales</b></font></p>     <p align="justify"><font face="verdana" size="2">Los objetivos de manejo tienen como fin el mejorar el  aporte de ox&iacute;geno y de nutrientes, disminuir el consumo de energ&iacute;a, corregir  los trastornos metab&oacute;licos. Es fundamental el tratamiento de los procesos  infecciosos que ocasionen descompensaci&oacute;n de la funci&oacute;n contr&aacute;ctil del coraz&oacute;n;  por ello ante afectaci&oacute;n de las condiciones cl&iacute;nicas, con presencia de  reactantes de fase aguda elevados y aun en ausencia de fiebre, debe alertar la  posibilidad de proceso infeccioso intercurrente, por lo que se debe proceder a  toma de cultivos e inicio de manejo antibi&oacute;tico. Es necesario el mantener una  adecuada saturaci&oacute;n de ox&iacute;geno con el fin de permitir una adecuada oxigenaci&oacute;n  de tejidos y prevenir la falla org&aacute;nica m&uacute;ltiple. Aunque se debe incrementar la  fracci&oacute;n inspirada de ox&iacute;geno y se deber&aacute; indicar asistencia mec&aacute;nica  ventilatoria si no se logra mejorar el aporte de ox&iacute;geno a los tejidos. Se debe  tener en cuenta que la hiperoxia puede estar asociada a disminuci&oacute;n del flujo  coronario, incremento de la resistencia perif&eacute;rica y disminuci&oacute;n del gasto  card&iacute;aco. La ventilaci&oacute;n asistida se debe indicar en presencia de alteraciones  en la conciencia, hipercapnia, trabajo respiratorio importante o fatiga (<i><a href="#t1">Tabla  I</a>)</i>.</font></p>     <p align="center"><font size="2" face="verdana"><a name="t1"></a></font></p>     <p align="center"><font size="2" face="verdana"><img src="/img/revistas/acm/v77s1/a8t1.jpg"></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>Inotr&oacute;picos</b></font></p>     <p align="justify"><font face="verdana" size="2">El agente inotr&oacute;pico ideal para el tratamiento de la  disfunci&oacute;n card&iacute;aca es aquel que produzca una contractilidad mioc&aacute;rdica  adecuada, que incremente la entrega de ox&iacute;geno (DO2) a los tejidos, optimice el  flujo sangu&iacute;neo regional, disminuya la congesti&oacute;n pulmonar cuando exista, sin  ocasionar a la vez alteraciones en la frecuencia card&iacute;aca, provocar arritmias o  incrementar el consumo de ox&iacute;geno mioc&aacute;rdico (MVO2).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INC 2 Digoxina</b></font></p>     <p align="justify"><font face="verdana" size="2">En el tratamiento de la falla card&iacute;aca cr&oacute;nica se  administra por v&iacute;a oral o intravenosa. Los niveles terap&eacute;uticos son de 0.5 a 2 &eta;g/mL. La dosis de  impregnaci&oacute;n y mantenimiento son de acuerdo con la edad del enfermo. Su mayor  utilidad cl&iacute;nica es para el tratamiento ambulatorio de la insuficiencia  card&iacute;aca cr&oacute;nica aunque tambi&eacute;n se utiliza como coadyuvante en el tratamiento  de la falla card&iacute;aca aguda o descompensada, para el tratamiento de las  taquiarritmias supraventriculares del tipo de la reentrada, el fl&uacute;ter y la  fibrilaci&oacute;n auricular <i>(<a href="#t2">Tabla II</a>)</i>.</font></p>     <p align="center"><font size="2" face="verdana"><a name="t2"></a></font></p>     <p align="center"><font size="2" face="verdana"><img src="/img/revistas/acm/v77s1/a8t2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INC 2 Dopamina</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Causa una estimulaci&oacute;n dosis&#150;dependiente de los receptores  dopa, <i>&alpha;</i> y <i>&beta;</i>. Se usa inicialmente a dosis bajas para mejorar la contractilidad  mioc&aacute;rdica y aumentar el flujo sangu&iacute;neo renal. Varios estudios en ni&ntilde;os  sugieren que los efectos dosis&#150;dependiente de la dopamina est&aacute;n relacionados  con la edad.</font></p>     <p align="justify"><font face="verdana" size="2">A dosis bajas (1&#150;3 &mu;g/kg/min) estimula los receptores  dopamin&eacute;rgicos y produce relajaci&oacute;n de las vasculaturas cerebral, renal,  coronaria, mesent&eacute;rica y pulmonar, con ligero aumento del MVO2, sin afectar las  resistencias vasculares sist&eacute;micas. A dosis medias (5&#150;10 &mu;g/kg/min) act&uacute;a  directamente sobre los receptores &beta;1 e indirectamente libera noradrenalina de  las terminaciones nerviosas, produciendo incremento en la contractilidad y la  frecuencia card&iacute;aca. En dosis altas (&gt; 10 &mu;g/kg/min) estimula receptores &alpha;1,  provocando aumento en las resistencias vasculares sist&eacute;micas y pulmonares,  frecuencia card&iacute;aca y presi&oacute;n arterial sist&eacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2">La dopamina es uno de los agentes que m&aacute;s se utiliza en  quienes cursan con bajo gasto card&iacute;aco e hipotensi&oacute;n, secundarios a afecci&oacute;n  cardiovascular por asfixia perinatal, posterior a cirug&iacute;a card&iacute;aca, procesos  s&eacute;pticos y problemas respiratorios, entre otros. En ocasiones se utiliza en  dosis bajas para mejorar el flujo renal de los enfermos que cursan con oliguria  y presi&oacute;n arterial normal, sobre todo despu&eacute;s de cirug&iacute;a a coraz&oacute;n abierto. En  los ni&ntilde;os pret&eacute;rminos pueden ser necesarias dosis mayores de 10 &mu;g/kg/min para  mejorar la presi&oacute;n arterial sist&eacute;mica y la frecuencia card&iacute;aca, dada la  inmadurez del miocardio en ellos. Hay que utilizarla con cuidado en aquellos  ni&ntilde;os que cursan con resistencias vasculares pulmonares elevadas. Las  complicaciones de la infusi&oacute;n de dopamina son la necrosis tisular por la  extravasaci&oacute;n del medicamento, por lo que se recomienda su administraci&oacute;n a  trav&eacute;s decat&eacute;teres centrales.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INC 3 dobutamina</b></font></p>     <p align="justify"><font face="verdana" size="2">Es un agente vasoactivo que aumenta el volumen latido,  incrementando la fuerza de contracci&oacute;n ventricular, tiene efectos primariamente  &beta;1 y &beta;2 con incremento en la fuerza de contracci&oacute;n y vasodilataci&oacute;n perif&eacute;rica,  Su dosis inicial es de 5 a  10 &mu;g/kg/min y se administra seg&uacute;n respuesta. La combinaci&oacute;n de dobutamina en  dosis de 5 a  10 &mu;g/kg/min con dopamina es &uacute;til como esquema inotr&oacute;pico inicial. A diferencia  de la dopamina, &eacute;sta puede ser administrada por v&iacute;a perif&eacute;rica mientras se  logra un acceso central.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INC 2 adrenalina</b></font></p>     <p align="justify"><font face="verdana" size="2">Es una catecolamina end&oacute;gena potente, la infusi&oacute;n de  epinefrina resulta en una estimulaci&oacute;n dosis&#150;dependiente de los receptores &alpha;1, &beta;1 y &beta;2. La  adrenalina es indicada en dosis de 0.2 a 0.3 &mu;g/kg/min que da como resultado  primario una estimulaci&oacute;n de receptores &beta; que ocasiona vasodilataci&oacute;n  perif&eacute;rica, aumenta la fuerza de contracci&oacute;n mioc&aacute;rdica y por ende el gasto  card&iacute;aco. La dosis va de 0.01&#150;0.5 &mu;g/kg/min ajustando la dosis  seg&uacute;n efectos.</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>INC 2 Noradrenalina</b></font></p>     <p align="justify"><font face="verdana" size="2">Un precursor de la adrenalina, es un agente potente que  act&uacute;a primariamente en receptores X, causando un incremento significativo en la  resistencia vascular sist&eacute;mica. Rara vez se indica como agente &uacute;nico en los  estados de disfunci&oacute;n contr&aacute;ctil del miocardio en la terapia intensiva. A  menudo se usa en combinaci&oacute;n con la dopamina y la dobutamina en situaciones de  choque s&eacute;ptico o choque cardiog&eacute;nico asociado con hipotensi&oacute;n persistente y  baja resistencia vascular sist&eacute;mica. Sus dosis habituales van de 0.05 a 0.5 &mu;g/kg/min.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INC 2 isoproterenol</b></font></p>     <p align="justify"><font face="verdana" size="2">Es muy &uacute;til cuando se necesita simult&aacute;neamente reducir la  precarga y la poscarga. Su indicaci&oacute;n principal es en casos con bradicardia  persistente o bloqueo atrioventricular y con trasplante card&iacute;aco. Ayuda a mantener  la frecuencia card&iacute;aca y el inotropismo, posterior a cirug&iacute;a card&iacute;aca, que  conlleve a disfunci&oacute;n mioc&aacute;rdica del ventr&iacute;culo derecho.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Inhibidores de la fosfodiesterasa</b></font></p>     <p align="justify"><font face="verdana" size="2">Entre los inotr&oacute;picos no simpaticomim&eacute;ticos destacan los  inhibidores de la fosfodiesterasa tipo III, que producen un incremento del AMP c&iacute;clico intracelular  y por lo tanto elevaci&oacute;n de los niveles de calcio intracelular, inotropismo  positivo y vasodilataci&oacute;n. Los efectos inotr&oacute;picos son independientes de los  receptores <i>&beta;</i> y <i>&alpha;</i> adren&eacute;rgicos.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Milrinona (INC 2), </b>&eacute;sta  causa mayor decremento de la presi&oacute;n diast&oacute;lica del ventr&iacute;culo izquierdo y de  la presi&oacute;n arterial media. Estos medicamentos eran considerados como una  segunda opci&oacute;n terap&eacute;utica para el tratamiento de la disfunci&oacute;n card&iacute;aca, pero  en la actualidad los utilizamos como medicamentos de primera l&iacute;nea.&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">La <b>milrinona </b>es un potente  venodilatador al igual que el captopril, lo que permite la mejor&iacute;a del cardi&oacute;pata  con falla card&iacute;aca. Tambi&eacute;n se ha utilizado en el choque s&eacute;ptico hiperdin&aacute;mico,  con incremento del &iacute;ndice card&iacute;aco, el volumen latido, el &iacute;ndice de trabajo del  ventr&iacute;culo derecho e izquierdo y con disminuci&oacute;n significativa de las  resistencias vasculares sist&eacute;micas y pulmonares, sin observarse cambios importantes  en la frecuencia card&iacute;aca y presi&oacute;n capilar pulmonar.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Su uso en neonatos y ni&ntilde;os postoperados de coraz&oacute;n con  falla card&iacute;aca, hipertensi&oacute;n arterial pulmonar y sist&eacute;mica ha sido de gran  utilidad.Incrementa el gasto card&iacute;aco, disminuye las resistencias pulmonares  y sist&eacute;micas, sin alterar el MVO2. Las dosis terap&eacute;uticas recomendadas van de 0.3 a 1 &mu;g/kg/min.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Levosimendan (INC 3) </b>es  una piridazinona&#150;dinitrito que pertenece al grupo de agentes sensibilizadores de  calcio. Act&uacute;a a trav&eacute;s de la interacci&oacute;n dependiente de calcio con troponina C,  activa los canales de calcio sensibles ATP y es un potente inhibidor de la  fosfodiesterasa tipo III. Se administra a dosis de 0.1 hasta 0.6 &mu;g/kg/ min  dosis&#150;respuesta, durante un per&iacute;odo de 24 a 72 h. Se considera una opci&oacute;n terap&eacute;utica  en cardi&oacute;patas con funci&oacute;n mioc&aacute;rdica comprometida e hipertensi&oacute;n pulmonar. Existe  experiencia inicial en su uso, tanto en reci&eacute;n nacidos y en lactantes como en  ni&ntilde;os mayores.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Manejo de la  precarga</b></font></p>     <p align="justify"><font face="verdana" size="2"><b>Diur&eacute;ticos</b></font></p>     <p align="justify"><font face="verdana" size="2">En la insuficiencia card&iacute;aca existe aumento de reabsorci&oacute;n  de sodio y agua a nivel del ri&ntilde;&oacute;n, circunstancia que produce congesti&oacute;n venosa pulmonar  y sist&eacute;mica. Desde el punto de vista funcional, los diur&eacute;ticos est&aacute;n indicados  en cualquier forma de insuficiencia card&iacute;aca; su acci&oacute;n es la de aumentar la  excreci&oacute;n renal de sodio, efecto que se complementa con el aumento de la perfusi&oacute;n  renal al asociarlos con vasodilatadores e inotr&oacute;picos card&iacute;acos. Su  administraci&oacute;n debe ser estricta, con un control seriado de los electr&oacute;litos  s&eacute;ricos.</font></p>     <p align="justify"><font face="verdana" size="2">Los diur&eacute;ticos act&uacute;an en diferentes niveles del nefr&oacute;n. El <b>furosemide,  la bumetamida y el &aacute;cido</b> <b>etacr&iacute;nico (INC 2) </b>lo hacen en el asa de Henle  y, por tal raz&oacute;n, interfieren en la absorci&oacute;n de agua libre por inhibici&oacute;n del  transporte de sodio, potasio y cloro. Aumentan la excreci&oacute;n de potasio, por lo  que requieren de la administraci&oacute;n suplementaria de potasio en forma concomitante,  o su asociaci&oacute;n con diur&eacute;ticos que eviten la eliminaci&oacute;n de &eacute;ste. La dosis de  furosemida es de 1 a  2 mg/kg/dosis por v&iacute;a endovenosa, mientras que por la v&iacute;a oral se utilizan  dosis que oscilan de 1 a  5 mg/kg/d&iacute;a repartidos en dos o tres tomas. La <b>clorotiazida</b> <b>y la  hidroclorotiazida (INC 2) </b>son diur&eacute;ticos que act&uacute;an en el t&uacute;bulo distal,  evitando la absorci&oacute;n de sodio, eliminan potasio y generan agua libre. Est&aacute;  indicado el uso suplementario de sales de potasio en forma concomitante o su asociaci&oacute;n  con espironolactona. Ambos diur&eacute;ticos pueden producir plaquetopenia y toxicidad  hep&aacute;tica. La dosis de clorotiazida es de 20 a 40 mg/kg/d&iacute;a en una o repartido en varias tomas  por la v&iacute;a oral. La hidroclorotiazida se utiliza a dosis de 2 a 4 mg/kg/d&iacute;a en una o dos tomas  por v&iacute;a oral<i>.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>La espironolactona (INC 2) </b>es un diur&eacute;tico d&eacute;bil, act&uacute;a en el t&uacute;bulo distal y  sistema colector, elimina el sodio y es ahorrador de potasio al impedir que la  aldosterona se una a receptores citoplasm&aacute;ticos. La dosis utilizada oscila  entre 1 y 3 mg/kg/d&iacute;a por la v&iacute;a oral, en una o dos tomas. Se sugiere control  del potasio s&eacute;rico durante su uso.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Manejo de la  poscarga</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Vasodilatadores</b></font></p>     <p align="justify"><font face="verdana" size="2">La indicaci&oacute;n de los vasodilatadores perif&eacute;ricos en la  insuficiencia card&iacute;aca es la de reducir las resistencias vasculares sist&eacute;micas  y disminuir la poscarga, permitiendo as&iacute; al coraz&oacute;n mejorar su funci&oacute;n de bomba  y aumentar el gasto card&iacute;aco.Por otra parte, los vasodilatadores venosos  aumentan la capacitancia del lecho vascular venoso reduciendo la precarga. Si  tomamos en cuenta estas acciones farmacol&oacute;gicas, est&aacute; indicada su administraci&oacute;n  de acuerdo al efecto que se desea.</font></p>     <p align="justify"><font face="verdana" size="2"><b>La nitroglicerina (INC 2) </b>su efecto principal es el incremento de la capacitancia  venosa con cambios m&iacute;nimos en la vasculatura arterial. Su utilidad en ni&ntilde;os es  primordialmente en cardi&oacute;patas posoperados de cirug&iacute;a cardiovascular para mejorar  el flujo coronario, en la que destaca la operaci&oacute;n de Jatene, cirug&iacute;a correctiva  para el tratamiento de la transposici&oacute;n de grandes arterias, donde se puede  producir espasmo de las arterias coronarias tanto por la manipulaci&oacute;n de las  coronarias, secundario a su reimplante, as&iacute; como por la hipertensi&oacute;n arterial  pulmonar con que cursan estos enfermos y que se asocia con incremento de la endotelina&#150;1,  que puede ser revertida con la administraci&oacute;n de nitroglicerina. Tambi&eacute;n se ha  utilizado como coadyuvante en el tratamiento de la falla card&iacute;aca y la  hipertensi&oacute;n arterial pulmonar en aquellos ni&ntilde;os en quienes se corrigen cardiopat&iacute;as  con cortocircuito de izquierda a derecha y en quienes se les realiz&oacute; alguna  variante de la cirug&iacute;a de Fontan.</font></p>     <p align="justify"><font face="verdana" size="2"> Su dosis depende de dosis&#150;respuesta obtenida  y va de 0.5 a  10 &mu;g/kg/min, se utilizan dosis bajas para mejorar el flujo sangu&iacute;neo coronario  y dosis altas en quienes padecen hipertensi&oacute;n arterial pulmonar.</font></p>     <p align="justify"><font face="verdana" size="2">El <b>nitroprusiato de sodio (INC 2) </b>es un  vasodilatador potente que relaja el m&uacute;sculo liso tanto de vasos venosos como  arteriales, con un mecanismo de acci&oacute;n similar a la nitroglicerina produce ion  cianuro, que es reducido en el h&iacute;gado a tiocianato por la enzima rhodanasa y se  excreta por la orina con una vida media de 3 a 4 d&iacute;as. La dosis va de 0.5 a 10 &mu;g/kg/min.</font></p>     <p align="justify"><font face="verdana" size="2"> Su  indicaci&oacute;n principal es en quienes evolucionan con hipertensi&oacute;n arterial  sist&eacute;mica grave, posterior a cirug&iacute;as de coartectom&iacute;a a&oacute;rtica, de reparaci&oacute;n  del arco a&oacute;rtico o del tracto de salida del ventr&iacute;culo izquierdo; tambi&eacute;n est&aacute;  indicada para mejorar el gasto card&iacute;aco en ni&ntilde;os con disfunci&oacute;n mioc&aacute;rdica,  secundaria a falla card&iacute;aca posquir&uacute;rgica, miocardiopat&iacute;a, insuficiencia mitral  y/o a&oacute;rtica. Su efecto adverso principal es la hipotensi&oacute;n, por lo que se  sugiere, para un monitoreo id&oacute;neo, la colocaci&oacute;n de una l&iacute;nea arterial  sist&eacute;mica para la determinaci&oacute;n continua de la presi&oacute;n arterial mientras se  tenga la infusi&oacute;n de nitroprusiato de sodio. Si se produce hipotensi&oacute;n se debe  ajustar la dosis o suspenderla e inclusive administrar expansores de volumen.</font></p>     <p align="justify"><font face="verdana" size="2">Despu&eacute;s  de una infusi&oacute;n prolongada o en un cardi&oacute;pata con falla hep&aacute;tica y/o renal  puede aparecer intoxicaci&oacute;n por cianuro y tiocianato, provocando psicosis  t&oacute;xica aguda. La intoxicaci&oacute;n por cianuro causa hipoxia tisular con acidosis metab&oacute;lica,  incremento de la saturaci&oacute;n de ox&iacute;geno venoso mixta o taquifilaxia del  medicamento.</font></p>     <p align="justify"><font face="verdana" size="2">La reducci&oacute;n de la poscarga sist&eacute;mica cr&oacute;nica se logra con  inhibidores de la enzima convertidota de angiotensina como el <b>captopril (INC  2) y el</b> <b>enalapril (INC 3)</b>. La acci&oacute;n farmacol&oacute;gica de estos  medicamentos se obtiene tanto por la reducci&oacute;n de las resistencias vasculares  sist&eacute;micas, como por el aumento de la capacitancia venosa a consecuencia de su  acci&oacute;n venodilatadora. Est&aacute;n indicados en los casos con bajo gasto card&iacute;aco y con  aumento del llenado ventricular; as&iacute; como en aquellos enfermos portadores de  importante cortocircuito intracard&iacute;aco de izquierda a derecha o de enfermedades  del miocardio. El captopril es uno de los m&aacute;s usados y la dosis va de 0.1 a 0.4 mg/kg/d&iacute;a en reci&eacute;n  nacidos; de 0.5 a  1 mg/kg/ d&iacute;a en lactantes y de 6.2   a 12.5 mg/kg/d&iacute;a en mayores de dos a&ntilde;os, divididos en  tres tomas.</font></p>     <p align="justify"><font face="verdana" size="2">Existen en el mercado otros vasodilatadores comola <b>hidralazina  (INC 2)</b>, que reduce las resistenciasvasculares perif&eacute;ricas por vasodilataci&oacute;n  arterial(dosis de 0.1 a  0.5 mg/kg/dosis cada 6 horas);y <b>prazocin (INC 3) </b>potente bloqueador alfa (dosis  de 25 a  150 &mu;g/kg cada 12 &oacute; 24 horas).</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>Manejo del cronotropismo</b></font></p>     <p align="justify"><font face="verdana" size="2">Los betabloqueadores disminuyen el ino y cronotropismo, situaci&oacute;n  que en ocasiones es necesaria para mejorar el gasto card&iacute;aco. Tienen una indicaci&oacute;n  precisa en las cardi&oacute;patas con insuficiencia card&iacute;aca cr&oacute;nica, deben ser  utilizados una vez que se ha logrado la estabilizaci&oacute;n hemodin&aacute;mica. En el  pasado el m&aacute;s utilizado era el <b>propranolol (INC 2)</b>, en la actualidad se  han agregado a la lista el <b>esmolol (INC 2), labetalol</b> <b>(INC 2),  carvelidol (INC 3)</b>. El esmolol es un antagonista &beta;1, con una vida media de  distribuci&oacute;n de 4.5 &plusmn; 2.1 minutos. Sus efectos electrofisiol&oacute;gicos por los que  reduce la frecuencia card&iacute;aca son porque disminuyen la descarga del modo  sinusal y por el retraso de la conducci&oacute;n a trav&eacute;s del nodo atrioventricular.</font></p>     <p align="justify"><font face="verdana" size="2">La  indicaci&oacute;n m&aacute;s frecuente en edad pedi&aacute;trica es en el tratamiento de la  taquicardia supraventricular sin repercusi&oacute;n hemodin&aacute;mica, para el control de  hipertensi&oacute;n arterial sist&eacute;mica en ni&ntilde;os posoperados de coartectom&iacute;a y/o del  tracto de salida del ventr&iacute;culo izquierdo, en el tratamiento de las crisis  hip&oacute;xicas en cardi&oacute;patas con tetralog&iacute;a de Fallot, en la tirotoxicosis, al  feocromocitoma y en la intoxicaci&oacute;n por coca&iacute;na. Sus efectos adversos son:  broncoespasmo, hipotensi&oacute;n, bradicardia e incluso paro card&iacute;aco. Se debe utilizar  con mucho cuidado cuando se administran simult&aacute;neamente con bloqueadores de los  canales de calcio.</font></p>     <p align="justify"><font face="verdana" size="2">Si el estado de bajo gasto card&iacute;aco persiste,  principalmente en los posquir&uacute;rgicos card&iacute;acos, los dispositivos de soporte  circulatorio mec&aacute;nicos pueden ser de mucha utilidad para su tratamiento. Tres formas de soporte mec&aacute;nico est&aacute;n actualmente disponibles:  1) bal&oacute;n de contrapulsaci&oacute;n intra&#150;a&oacute;rtico (BIAC); 2) dispositivos de asistencia  ventricular (DAV) y 3) oxigenaci&oacute;n de membrana extracorp&oacute;rea (ECMO).</font></p>     <p align="justify"><font face="verdana" size="2">El <b>bal&oacute;n de contrapulsaci&oacute;n (INC 3) </b>es un cat&eacute;ter&#150;  bal&oacute;n, que se coloca en la aorta descendente, usualmente a trav&eacute;s de la arteria  femoral. El bal&oacute;n se infla durante la di&aacute;stole y mejora el estado hemodin&aacute;mico  al incrementar el flujo coronario y disminuir la poscarga del ventr&iacute;culo izquierdo.  Tiene numerosas desventajas en la poblaci&oacute;n pedi&aacute;trica, ya que la mejor&iacute;a  hemodin&aacute;mica alcanzada es a menudo inadecuada a causa de la gran  distensibilidad de la pared a&oacute;rtica en ni&ntilde;os. El acceso vascular tambi&eacute;n puede ser  un problema para la inserci&oacute;n a causa del peque&ntilde;o tama&ntilde;o de las arterias  femorales. La elevada frecuencia card&iacute;aca en muchos ni&ntilde;os tambi&eacute;n interfiere  con la sincron&iacute;a del bal&oacute;n. Finalmente, existen reportes de complicaciones en los  que ocasionalmente se ha encontrado oclusi&oacute;n de la arteria mesent&eacute;rica  superior, una arteria renal y de las arterias femorales.</font></p>     <p align="justify"><font face="verdana" size="2">Se dispone de tres tipos de <b>dispositivos </b>de <b>asistencia</b> <b>ventricular (INC 2)</b>: 1) Dispositivo de asistencia ventricular izquierdo; 2) Dispositivo de  asistencia ventricular derecho; 3) Dispositivo de asistencia biventricular. El  dispositivo 1 de asistencia ventricular izquierdo asiste la funci&oacute;n de dicho  ventr&iacute;culo bombeando la sangre desde el atrio izquierdo a la aorta; este  dispositivo ha sido extremadamente &uacute;til en los adultos con enfermedad card&iacute;aca  isqu&eacute;mica y disfunci&oacute;n ventricular izquierda. Sin embargo, en los ni&ntilde;os la  disfunci&oacute;n izquierda aislada es menos probable que ocurra sin alterar la  funci&oacute;n ventricular derecha y la funci&oacute;n pulmonar.&nbsp; </font></p>     <p align="justify"><font face="verdana" size="2">De manera similar el dispositivo de  asistencia ventricular derecha bombea sangre del atrio derecho a la arteria  pulmonar, se utiliza para disfunci&oacute;n ventricular derecha aislada, situaci&oacute;n no  poco frecuente en la poblaci&oacute;n pedi&aacute;trica. Finalmente el dispositivo  biventricular puede ser utilizado en caso de disfunci&oacute;n de ambos ventr&iacute;culos,  su uso puede ser t&eacute;cnicamente dif&iacute;cil en ni&ntilde;os muy peque&ntilde;os.</font></p>     <p align="justify"><font face="verdana" size="2">Las ventajas de los dispositivos de asistencia ventricular  incluyen el proporcionar un buen aporte de ox&iacute;geno a los tejidos a la vez de  disminuir el trabajo al ventr&iacute;culo, permitiendo la cicatrizaci&oacute;n ventricular,  adem&aacute;s de poder usar niveles m&aacute;s bajos de anticoagulaci&oacute;n en relaci&oacute;n al ECMO. Las desventajas incluyen las complicaciones por sangrado, que obliga a la  reoperaci&oacute;n, disfunci&oacute;n pulmonar, insuficiencia renal y el riesgo potencial de  infecciones.</font></p>     <p align="justify"><font face="verdana" size="2">La <b>oxigenaci&oacute;n con membrana extracorp&oacute;rea (INC 3) </b>utiliza  un cortocircuito venoarterial conun ECMO. Esta t&eacute;cnica permite soporte  pulmonary hemodin&aacute;mico. Los resultados han sido excelentescomo  tratamiento para la falla respiratorianeonatal con sobrevida de m&aacute;s del  80% en muchossubgrupos que incluyen neonatos con s&iacute;ndromede  aspiraci&oacute;n de meconio, patr&oacute;n fetal persistentee hipertensi&oacute;n pulmonar  primaria. Laoxigenaci&oacute;n con membrana extracorp&oacute;rea se est&aacute;utilizando  con mayor frecuencia para proporcionarsoporte para ni&ntilde;os con disfunci&oacute;n  cardiopulmonarsevera despu&eacute;s de cirug&iacute;a para enfermedadcard&iacute;aca  cong&eacute;nita. La sobrevida en muchos centrosahora excede el 50%. Las  desventajas incluyenla necesidad de anticoagulaci&oacute;n en nivelesaltos,  con el riesgo consecuente de sangrado y laposibilidad de infecciones.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
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<article-title xml:lang="en"><![CDATA[Cardiovascular drugs in children Angiotensin- converting enzyme inhibitors in pediatric patients]]></article-title>
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