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                  <h1  class="field field--name-title field--type-string field--label-hidden responsive-container responsive-container-constrained field__item"><span class="ht-kicker">Arritmia </span>Síndrome de QT largo<hr>
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<h2 class="field--name-field-component-section-titl component-section-section-title">¿Qué es el síndrome de QT largo?</h2>

            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p>El síndrome de QT largo (SQTL) es un tipo de <a href="https://www.nhlbi.nih.gov/es/salud/trastornos-de-la-conduccion" rel="noreferrer">trastorno de la conducción</a>.  Un trastorno de la conducción es un problema con el sistema eléctrico que controla los latidos cardíacos.</p>

<p>El término “QT largo” se refiere a un problema en el patrón que se ve en un <a href="https://www.nhlbi.nih.gov/es/salud/estudios-cardiacos" rel="noreferrer">electrocardiograma</a> (ECG). El ECG es una prueba que detecta y registra la actividad eléctrica del corazón. La información del ECG se mapea en un gráfico para que el médico pueda estudiar la actividad eléctrica del corazón. Cada latido cardíaco se mapea como cinco ondas eléctricas separadas: P, Q, R, S y T.</p>

<p>La actividad eléctrica que ocurre entre las ondas Q y T se denomina intervalo QT. Este intervalo muestra la actividad eléctrica en las cámaras inferiores del corazón, llamadas ventrículos. Normalmente, el tiempo entre la onda Q y la onda T es de alrededor de un tercio de cada ciclo del latido cardíaco. Sin embargo, en personas que tienen SQTL, el intervalo QT dura más que lo normal.</p>

<p><strong>ECG</strong></p>

<figure role="group" class="align-center b-loaded caption caption-img "><img alt="La imagen muestra la configuración estándar para un ECG. En la Figura A, un registro de ritmo cardíaco normal muestra el patrón eléctrico de un latido cardíaco regular. En la Figura B, un paciente se encuentra acostado en una camilla con los electrodos del ECG conectados a su pecho, brazos y piernas. Una enfermera monitorea el procedimiento indoloro" data-entity-type="file" data-entity-uuid="1c5f8f7b-09c7-4b54-935f-080b5b941291" data-image-style="" width="751" height="609" data-src="/sites/default/files/inline-images/EKG.Spanish.jpg" src="/modules/custom/nhlbi_blazy/images/clear.png" class="b-lazy" /><figcaption><em><strong>La imagen muestra la configuración estándar para un ECG.</strong> En la Figura A, un registro de ritmo cardíaco normal muestra el patrón eléctrico de un latido cardíaco regular. En la Figura B, un paciente se encuentra acostado en una camilla con los electrodos del ECG conectados a su pecho, brazos y piernas. Una enfermera monitorea el procedimiento indoloro.</em></figcaption></figure><p> </p>

<p>Un intervalo QT largo puede alterar la sincronización minuciosa del latido cardíaco y causar ritmos cardíacos rápidos incontrolables de forma súbita. El SQTL es raro, y no todas las personas que tienen un SQTL tienen ritmos cardíacos peligrosos. Sin embargo, cuando ocurren, pueden ser mortales.</p></div>
      
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<h2 class="field--name-field-component-section-titl component-section-section-title">¿Cuáles son las causas del síndrome de QT largo?</h2>

            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p>En la superficie de cada célula del músculo cardíaco hay pequeños poros denominados canales iónicos. Los canales iónicos se abren y se cierran para permitir que átomos de sodio, calcio y potasio (iones) cargados eléctricamente fluyan hacia el interior y exterior de cada célula. Esto genera la actividad eléctrica del corazón. En las personas que tienen SQTL, los canales iónicos posiblemente no funcionen bien, o puede haber demasiado pocos. Esto puede alterar la actividad eléctrica de las cámaras inferiores del corazón, o ventrículos, y causar <a href="https://www.nhlbi.nih.gov/es/salud/arritmias" rel="noreferrer">arritmias</a> peligrosas.</p>

<p>El SQTL es, con frecuencia, <span><span class="entity-embed node entity-embed-glossary_term"><a class="glossary-term" href="#" title="Definicion de hereditario " alt="Definicion de hereditario" data-term="hereditario" data-pronunciation="ereditário" data-definition="Paso de la información genética de un padre a través de los genes." role="link">
		hereditario
	</a></span></span>, lo que significa que se nace con la afección y la persona la tiene durante toda la vida. También se puede tener un SQTL adquirido. Esto significa que no se nace con el trastorno, sino que se desarrolla durante la vida.</p>

<p>Los siguientes <a href="https://www.nhlbi.nih.gov/es/salud/arritmias/causas" rel="noreferrer">factores pueden aumentar el riesgo de SQTL</a>:</p>

<ul><li><strong>Antecedente familiar de SQTL,</strong> o si alguien en la familia ha tenido desmayos o convulsiones inexplicadas, ahogamiento o casi ahogamiento, o muerte súbita inexplicada.</li>
	<li><strong>Afecciones cardíacas</strong> como una <a href="https://www.nhlbi.nih.gov/health/cardiomyopathy" rel="noreferrer">miocardiopatía</a> (en inglés) y <a href="https://www.nhlbi.nih.gov/health/congenital-heart-defects" rel="noreferrer">cardiopatías congénitas</a> (en inglés).</li>
	<li><strong>Afecciones médicas,</strong> como trastornos de la alimentación, enfermedad tiroidea, o náuseas o vómitos intensos, que causan concentraciones bajas de potasio, magnesio o calcio en sangre.</li>
	<li><strong>Medicamentos</strong> que afectan la forma en que funcionan los canales iónicos del corazón, incluidos algunos antibióticos, antidepresivos y antihistamínicos.</li>
	<li><strong>Sexo,</strong> ya que el SQTL es más frecuente en mujeres que en hombres. Las mujeres que tienen SQTL tienen más probabilidades de tener desmayos o morir en forma súbita por el trastorno durante la menstruación y poco después de un parto.</li>
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<h2 class="field--name-field-component-section-titl component-section-section-title">¿Cuáles son los síntomas?</h2>

            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p>Algunas personas que tienen SQTL posiblemente no tengan ningún síntoma. Esto se denomina SQTL silente. Otras pueden tener <a href="https://www.nhlbi.nih.gov/es/salud/arritmias/sintomas" rel="noreferrer">síntomas de arritmia</a>. Estos síntomas pueden producirse en situaciones específicas, como cuando experimentan estrés físico o emocional o cuando duermen. Los síntomas de los SQTL de tipo hereditario con frecuencia comienzan durante la niñez. Es infrecuente comenzar a tener síntomas después de los 40 años de edad.</p>

<p>Los síntomas del SQTL pueden incluir:</p>

<ul><li>Desmayos, que pueden ocurrir durante el estrés físico o emocional, y pueden incluir sensación de aleteo en el pecho antes de desmayarse.</li>
	<li>Ahogamiento o casi ahogamiento, que puede deberse a un desmayo mientras nada.</li>
	<li>Respiración dificultosa y ruidosa mientras duerme.</li>
	<li>Convulsiones.</li>
</ul><p>En alrededor de 1 de cada 10 personas que tienen SQTL, el <a href="https://www.nhlbi.nih.gov/es/salud/paro-cardiaco" rel="noreferrer">paro cardíaco súbito</a> (PCS) o una muerte súbita es el primer signo de SQTL. El PCS es una afección en la que el corazón súbitamente deja de latir sin ninguna causa evidente. Las personas que tienen PCS mueren en cuestión de minutos a menos que reciban tratamiento.</p>

<p>Algunos tipos de SQTL se asocian con problemas en otras partes del cuerpo, como sordera; debilidad muscular; problemas con la estructura de la cara, los dedos de la mano o de los pies y la columna; y problemas de conducta, aprendizaje y memoria.</p></div>
      
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<h2 class="field--name-field-component-section-titl component-section-section-title">¿Cómo se diagnostica?</h2>

            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p>Si alguien en la familia tiene SQTL, el médico posiblemente utilice estudios cardíacos y pruebas genéticas para detectar esta afección. Si tiene un tipo hereditario de SQTL, hable con su médico y familiares sobre las posibles pruebas genéticas para sus familiares.</p>

<p>Para diagnosticar un síndrome de QT largo, el médico le preguntará sobre sus antecedentes médicos, sus antecedentes médicos familiares, sus síntomas y los medicamentos que usa. Le realizará un examen físico y posiblemente le solicite una o más pruebas:</p>

<ul><li>Los <a href="https://www.nhlbi.nih.gov/es/salud/analisis-de-sangre" rel="noreferrer"><strong>análisis de sangre</strong></a> pueden verificar las concentraciones de <span><span class="entity-embed node entity-embed-glossary_term"><a class="glossary-term" href="#" title="Definicion de electrolito " alt="Definicion de electrolito" data-term="electrolito" data-pronunciation="elektrolíto" data-definition="Sustancias, como el sodio o el potasio, que se encuentran en los fluidos corporales y conducen la electricidad. Los riñones controlan la cantidad de electrolitos en el cuerpo." role="link">
		electrolitos
	</a></span></span> y <span><span class="entity-embed node entity-embed-glossary_term"><a class="glossary-term" href="#" title="Definicion de hormona tiroidea " alt="Definicion de hormona tiroidea" data-term="hormona tiroidea" data-pronunciation="[ormónas] [tiroidéa]" data-definition="Hormona producida por la glándula tiroides que controla la frecuencia cardíaca, la presión arterial, la temperatura corporal y el peso corporal." role="link">
		hormona tiroidea
	</a></span></span>.</li>
	<li>Las <strong>pruebas genéticas</strong> buscarán cambios en los genes que pueden causar SQTL y determinarán qué tipo de SQTL tiene.</li>
	<li>Los <strong>estudios cardíacos</strong> miden la actividad eléctrica del corazón<strong>.</strong> Un <a href="https://www.nhlbi.nih.gov/es/salud/estudios-cardiacos" rel="noreferrer">ECG</a> es la prueba más frecuente que se utiliza para diagnosticar un SQTL. Debido a que el intervalo QT puede cambiar de vez en cuando, es posible que necesite que se le realicen varios ECG durante un período de días o semanas o usar un <a href="https://www.nhlbi.nih.gov/es/salud/estudios-cardiacos" rel="noreferrer">monitor Holter</a>. Posiblemente también necesite una <a href="https://www.nhlbi.nih.gov/es/salud/estudios-cardiacos" rel="noreferrer">prueba de esfuerzo</a> para medir su ritmo</li>
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<h2 class="field--name-field-component-section-titl component-section-section-title">¿Cómo se trata y maneja?</h2>

            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p>El objetivo de tratar el SQTL es prevenir arritmias y episodios de desmayos. El tratamiento no es la cura del trastorno y posiblemente no restaure un intervalo QT normal. Sin embargo, el tratamiento reduce mucho el riesgo de problemas potencialmente mortales.</p>

<p>El tratamiento puede incluir:</p>

<ul><li><strong>Cambios en el estilo de vida:</strong> el médico posiblemente le pida que evite cosas que pueden causarle problemas con el ritmo cardíaco, como nadar u otras actividades físicas vigorosas, ruidos intensos súbitos como la alarma de un reloj, situaciones estresantes y algunos medicamentos. Consulte con su médico acerca de comer más alimentos con alto contenido de potasio (como las bananas) o tomar suplementos de potasio diariamente.</li>
	<li><strong>Medicamentos:</strong> quizás necesite betabloqueantes para prevenir que el corazón lata más rápido en respuesta al estrés físico o emocional. Si tiene concentraciones bajas de iones (electrolitos), el médico podrá darle magnesio o potasio por las venas. </li>
	<li><strong>Dispositivos médicos:</strong> el médico podrá recomendar un dispositivo como un <a href="https://www.nhlbi.nih.gov/health/pacemakers" rel="noreferrer">marcapasos</a> (en inglés) o un <a href="https://www.nhlbi.nih.gov/health/defibrillators" rel="noreferrer">cardiodesfibrilador implantable</a> (en inglés) para ayudar a controlar el ritmo cardíaco.</li>
	<li><strong>Cirugía:</strong> quizás necesite una cirugía para cortar los nervios que causan ritmos cardíacos peligrosos. Esto mantiene el corazón latiendo a un ritmo constante y disminuye el riesgo de arritmias causadas por estrés o ejercicio.</li>
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<h2 class="field--name-field-component-section-titl component-section-section-title">¿Qué ocurre si no se trata?</h2>

            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p>El SQTL es habitualmente una afección que dura toda la vida. El riesgo de tener un ritmo cardíaco anormal que produzca desmayos o <a href="https://www.nhlbi.nih.gov/es/salud/paro-cardiaco" rel="noreferrer">paro cardíaco súbito</a> puede disminuir a medida que aumenta la edad, especialmente en los hombres después de los 40 años. Sin embargo, el riesgo nunca desaparece por completo. En los niños que tienen SQTL, el intervalo QT con frecuencia retorna a lo normal después de la pubertad. Si esto ocurre, el riesgo de síntomas y complicaciones por el SQTL disminuye.</p>

<p>Visite la <a href="https://www.nhlbi.nih.gov/es/salud/arritmias/vivir-con-arritmia" rel="noreferrer">página Vivir con arritmias</a> para saber cómo prevenir las complicaciones y mantenerse seguro.</p></div>
      
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