{"id":6918,"date":"2026-05-04T16:12:18","date_gmt":"2026-05-04T13:12:18","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/mydriase\/"},"modified":"2026-06-01T13:04:42","modified_gmt":"2026-06-01T10:04:42","slug":"mydriase","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/mydriase\/","title":{"rendered":"Mydriase"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La mydriase (du grec <em>amydros<\/em> \u2014 sombre, obscur) est une dilatation pathologique persistante de la pupille qui ne r\u00e9agit pas ou r\u00e9agit mal \u00e0 la lumi\u00e8re vive. En neurotraumatologie, c&rsquo;est l&rsquo;un des sympt\u00f4mes locaux les plus importants de la compression c\u00e9r\u00e9brale.<\/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>\u00c9tiologie et physiopathologie<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">La taille de la pupille est r\u00e9gul\u00e9e par deux muscles : le sphincter (contracteur) et le dilatateur (dilateur). Les fibres nerveuses parasympathiques, qui passent dans le nerf oculomoteur (troisi\u00e8me paire de nerfs cr\u00e2niens), contr\u00f4lent le travail du sphincter.<\/p>\n\n<p class=\"wp-block-paragraph\">Une caract\u00e9ristique de l&rsquo;anatomie est que ces fibres fragiles sont situ\u00e9es directement \u00e0 la surface du tronc nerveux. Lorsque le tissu c\u00e9r\u00e9bral d\u00e9plac\u00e9 commence \u00e0 comprimer le nerf oculomoteur lors d&rsquo;une herniation temporale-tentoriale, ces fibres superficielles sont les premi\u00e8res \u00e0 \u00eatre affect\u00e9es. Le signal de contraction de la pupille est bloqu\u00e9, et le muscle dilatateur peut agrandir la pupille sans entrave.<\/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>Importance clinique<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">L&rsquo;apparition d&rsquo;une mydriase unilat\u00e9rale persistante chez un patient ayant subi un traumatisme cr\u00e2nien est un sympt\u00f4me classique qui, avec plus de 80 % de probabilit\u00e9, indique la pr\u00e9sence d&rsquo;un h\u00e9matome intracr\u00e2nien \u00e9tendu.<\/p>\n\n<p class=\"wp-block-paragraph\">Une r\u00e8gle diagnostique cruciale est que la pupille dilat\u00e9e appara\u00eet presque toujours du c\u00f4t\u00e9 de l&rsquo;h\u00e9morragie. Cela permet au neurochirurgien de d\u00e9terminer sans erreur de quel c\u00f4t\u00e9 acc\u00e9der \u00e0 l&rsquo;h\u00e9matome, m\u00eame sans tomodensitom\u00e8tre \u00e0 disposition. La mydriase bilat\u00e9rale (pupilles dilat\u00e9es sur les deux yeux, non r\u00e9actives \u00e0 la lumi\u00e8re) est un signe pronostique extr\u00eamement d\u00e9favorable, indiquant une destruction totale ou une hypoxie profonde du tronc c\u00e9r\u00e9bral.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La mydriase (du grec <em>amydros<\/em> \u2014 sombre, obscur) est une dilatation pathologique persistante de la pupille qui ne r\u00e9agit pas ou r\u00e9agit mal \u00e0 la lumi\u00e8re vive. En neurotraumatologie, c&rsquo;est l&rsquo;un des sympt\u00f4mes locaux les plus importants de la compression c\u00e9r\u00e9brale.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6918","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>Mydriase : d\u00e9finition m\u00e9dicale et description | Voka Wiki<\/title>\n<meta name=\"description\" content=\"La mydriase (du grec amydros \u2014 sombre, obscur) est une dilatation pathologique persistante de la pupille qui ne r\u00e9agit pas ou r\u00e9agit mal \u00e0 la lumi\u00e8re vive. 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