{"id":6878,"date":"2026-05-04T16:12:14","date_gmt":"2026-05-04T13:12:14","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/hemorragie-sous-arachnoidienne-traumatique\/"},"modified":"2026-06-01T13:05:29","modified_gmt":"2026-06-01T10:05:29","slug":"hemorragie-sous-arachnoidienne-traumatique","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/hemorragie-sous-arachnoidienne-traumatique\/","title":{"rendered":"H\u00e9morragie sousarachno\u00efdienne traumatique"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">L&rsquo;h\u00e9morragie sous-arachno\u00efdienne traumatique (du latin <em>sub-<\/em> \u2014 sous et du grec <em>arachne<\/em> \u2014 araign\u00e9e, <em>haima<\/em> \u2014 sang) est un amas pathologique de sang r\u00e9pandu dans l&rsquo;espace entre les m\u00e9ninges molles et arachno\u00efdes. <\/p>\n\n<p class=\"wp-block-paragraph\">Cette condition se d\u00e9veloppe \u00e0 la suite d&rsquo;une force m\u00e9canique sur la t\u00eate et est l&rsquo;une des cons\u00e9quences les plus courantes d&rsquo;une contusion 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\">Dans des conditions normales, l&rsquo;espace sous-arachno\u00efdien est rempli de liquide c\u00e9phalorachidien clair, qui circule autour du cerveau. Lors d&rsquo;un impact fort, du frottement du tissu c\u00e9r\u00e9bral contre les saillies osseuses du cr\u00e2ne ou de l&rsquo;\u00e9crasement du cortex, les petits vaisseaux sanguins superficiels se rompent.<\/p>\n\n<p class=\"wp-block-paragraph\">Le sang sous pression p\u00e9n\u00e8tre dans l&rsquo;espace sous-arachno\u00efdien, se m\u00e9lange au liquide c\u00e9phalorachidien et se propage rapidement le long des sillons et des citernes basales du cerveau. Contrairement \u00e0 une h\u00e9morragie spontan\u00e9e (qui r\u00e9sulte de la rupture d&rsquo;un an\u00e9vrisme), le type traumatique s&rsquo;accompagne toujours de l\u00e9sions m\u00e9caniques primaires du tissu c\u00e9r\u00e9bral lui-m\u00eame. Les produits de d\u00e9composition des \u00e9rythrocytes exercent une action chimique extr\u00eamement irritante sur les m\u00e9ninges et provoquent une inflammation aseptique aigu\u00eb.<\/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\">Le tableau clinique se caract\u00e9rise par un mal de t\u00eate insupportable, une photophobie et des vomissements r\u00e9p\u00e9t\u00e9s. Un syndrome m\u00e9ning\u00e9 dit se d\u00e9veloppe rapidement, dont le principal signe est une rigidit\u00e9 marqu\u00e9e des muscles du cou (le patient ne peut physiquement pas rapprocher son menton de sa poitrine).<\/p>\n\n<p class=\"wp-block-paragraph\">Cette condition ne n\u00e9cessite pas d&rsquo;ablation chirurgicale du sang lui-m\u00eame, car il est r\u00e9pandu en fine couche sur l&rsquo;ensemble du cerveau. Cependant, il est dangereux en raison de complications diff\u00e9r\u00e9es s\u00e9v\u00e8res. Les caillots sanguins peuvent obstruer les voies de drainage du liquide c\u00e9phalorachidien, provoquant une hydroc\u00e9phalie post-traumatique (hydropisie du cerveau). De plus, l&rsquo;effet chimique du sang sur les grandes art\u00e8res \u00e0 la base du cerveau provoque souvent leur spasme persistant (vasospasme), entra\u00eenant un AVC isch\u00e9mique secondaire quelques jours apr\u00e8s le traumatisme.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;h\u00e9morragie sous-arachno\u00efdienne traumatique (du latin <em>sub-<\/em> \u2014 sous et du grec <em>arachne<\/em> \u2014 araign\u00e9e, <em>haima<\/em> \u2014 sang) est un amas pathologique de sang r\u00e9pandu dans l&rsquo;espace entre les m\u00e9ninges molles et arachno\u00efdes. <\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6878","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>H\u00e9morragie sousarachno\u00efdienne traumatique : d\u00e9finition m\u00e9dicale et 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