{"id":6922,"date":"2026-05-04T16:12:18","date_gmt":"2026-05-04T13:12:18","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/midriasis\/"},"modified":"2026-06-01T13:04:46","modified_gmt":"2026-06-01T10:04:46","slug":"midriasis","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/es\/glosario\/midriasis\/","title":{"rendered":"Midriasis"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Midriasis (del griego <em>amydros<\/em> \u2014 oscuro, vago) es una dilataci\u00f3n patol\u00f3gica persistente de la pupila del ojo, que no reacciona o reacciona d\u00e9bilmente a la luz brillante. En la neurotraumatolog\u00eda, es uno de los s\u00edntomas locales m\u00e1s importantes del comprimido del enc\u00e9falo.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x44D;&#x442;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;-&#x438;-&#x43F;&#x430;&#x442;&#x43E;&#x444;&#x438;&#x437;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;\"><strong>Etiolog\u00eda y fisiopatolog\u00eda<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">El di\u00e1metro de la pupila es regulado por dos m\u00fasculos: el esf\u00ednter (que constri\u00f1e) y el dilatador (que expande). La funci\u00f3n del esf\u00ednter est\u00e1 controlada por fibras nerviosas parasimp\u00e1ticas que pasan como parte del nervio oculomotor (el tercer par de nervios craneales).<\/p>\n\n<p class=\"wp-block-paragraph\">La particularidad de la anatom\u00eda radica en que estas fr\u00e1giles fibras est\u00e1n situadas en la superficie del tronco nervioso. Cuando el tejido cerebral desplazado por una herniaci\u00f3n tentorial temporal comienza a presionar el nervio oculomotor, estas fibras superficiales son las primeras en sufrir da\u00f1o. La se\u00f1al para la constricci\u00f3n pupilar se bloquea \u2014 y el m\u00fasculo dilatador ampl\u00eda la pupila sin oposici\u00f3n.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\"><strong>Importancia cl\u00ednica<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">La aparici\u00f3n de una midriasis unilateral persistente en un paciente con traumatismo craneoencef\u00e1lico es un s\u00edntoma cl\u00e1sico que indica con una probabilidad superior al 80 % la presencia de un hematoma intracraneal extenso.<\/p>\n\n<p class=\"wp-block-paragraph\">Una regla diagn\u00f3stica fundamental dicta que la pupila dilatada casi siempre se presenta en el mismo lado que la hemorragia. Esto permite al neurocirujano determinar sin error de qu\u00e9 lado realizar el acceso al hematoma, incluso en ausencia de una tomograf\u00eda computarizada. La midriasis bilateral (pupilas dilatadas en ambos ojos, que no reaccionan a la luz) es un signo pron\u00f3stico extremadamente desfavorable, indicativo de una destrucci\u00f3n total o una hipoxia profunda del tronco encef\u00e1lico.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Midriasis (del griego <em>amydros<\/em> \u2014 oscuro, vago) es una dilataci\u00f3n patol\u00f3gica persistente de la pupila del ojo, que no reacciona o reacciona d\u00e9bilmente a la luz brillante. En la neurotraumatolog\u00eda, es uno de los s\u00edntomas locales m\u00e1s importantes del comprimido del enc\u00e9falo.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6922","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v26.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Midriasis: definici\u00f3n m\u00e9dica y descripci\u00f3n | Voka Wiki<\/title>\n<meta name=\"description\" content=\"Midriasis (del griego amydros \u2014 oscuro, vago) es una dilataci\u00f3n patol\u00f3gica persistente de la pupila del ojo, que no reacciona o reacciona d\u00e9bilmente a la luz brillante. 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