{"id":6921,"date":"2026-05-04T16:12:18","date_gmt":"2026-05-04T13:12:18","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/midriase\/"},"modified":"2026-06-01T13:04:45","modified_gmt":"2026-06-01T10:04:45","slug":"midriase","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/pt\/glossario\/midriase\/","title":{"rendered":"Midr\u00edase"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A midr\u00edase (do grego <em>amydros<\/em> \u2014 escuro, obscuro) \u00e9 uma dilata\u00e7\u00e3o patol\u00f3gica persistente da pupila do olho, que n\u00e3o reage ou reage fracamente \u00e0 luz intensa. Na neurotraumatologia, \u00e9 um dos mais importantes sintomas locais de compress\u00e3o do c\u00e9rebro.<\/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>Etiologia e fisiopatologia<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">O tamanho da pupila \u00e9 regulado por dois m\u00fasculos: o esf\u00edncter (que contrai a pupila) e o dilatador (que a dilata). A fun\u00e7\u00e3o do esf\u00edncter \u00e9 controlada por fibras nervosas parassimp\u00e1ticas que passam pelo nervo oculomotor (terceiro par de nervos cranianos).<\/p>\n\n<p class=\"wp-block-paragraph\">A peculiaridade anat\u00f4mica reside em que estas fibras delicadas est\u00e3o localizadas na superf\u00edcie do tronco nervoso. Quando, na hernia\u00e7\u00e3o temporal-supracerebelar, o tecido cerebral deslocado come\u00e7a a pressionar o nervo oculomotor, estas fibras superficiais s\u00e3o as primeiras a serem afetadas. O sinal de constri\u00e7\u00e3o da pupila \u00e9 bloqueado \u2014 e o m\u00fasculo dilatador fica livre para aumentar a pupila.<\/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>Import\u00e2ncia cl\u00ednica<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">O aparecimento de midr\u00edase unilateral persistente em pacientes com traumatismo cranioencef\u00e1lico \u00e9 um sintoma cl\u00e1ssico que indica com mais de 80% de probabilidade a presen\u00e7a de um grande hematoma intracraniano.<\/p>\n\n<p class=\"wp-block-paragraph\">Uma regra diagn\u00f3stica crucial \u00e9 que uma pupila dilatada quase sempre ocorre no lado da hemorragia. Isso permite que o neurocirurgi\u00e3o determine com precis\u00e3o de qual lado realizar o acesso ao hematoma, mesmo sem a presen\u00e7a de um tom\u00f3grafo computadorizado. A midr\u00edase bilateral (pupilas grandes nos dois olhos, n\u00e3o reativas \u00e0 luz) \u00e9 um sinal progn\u00f3stico extremamente pobre, sugerindo destrui\u00e7\u00e3o total ou hip\u00f3xia cerebral profunda.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A midr\u00edase (do grego <em>amydros<\/em> \u2014 escuro, obscuro) \u00e9 uma dilata\u00e7\u00e3o patol\u00f3gica persistente da pupila do olho, que n\u00e3o reage ou reage fracamente \u00e0 luz intensa. Na neurotraumatologia, \u00e9 um dos mais importantes sintomas locais de compress\u00e3o do c\u00e9rebro.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6921","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>Midr\u00edase: defini\u00e7\u00e3o m\u00e9dica e vis\u00e3o geral | Voka Wiki<\/title>\n<meta name=\"description\" content=\"A midr\u00edase (do grego amydros \u2014 escuro, obscuro) \u00e9 uma dilata\u00e7\u00e3o patol\u00f3gica persistente da pupila do olho, que n\u00e3o reage ou reage fracamente \u00e0 luz intensa. 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