{"id":6904,"date":"2026-05-04T16:12:19","date_gmt":"2026-05-04T13:12:19","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/pression-intracranienne\/"},"modified":"2026-06-01T13:04:36","modified_gmt":"2026-06-01T10:04:36","slug":"pression-intracranienne","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/pression-intracranienne\/","title":{"rendered":"Pression intracr\u00e2nienne"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La pression intracr\u00e2nienne (du latin <em>intra<\/em> \u2014 \u00e0 l&rsquo;int\u00e9rieur et <em>cranium<\/em> \u2014 cr\u00e2ne) est la pression physique exerc\u00e9e par le tissu c\u00e9r\u00e9bral, le sang qui y circule et le liquide c\u00e9phalorachidien (LCR) sur les parois rigides internes des os du cr\u00e2ne.<\/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 physiologie de ce processus est d\u00e9crite par la doctrine fondamentale de Monro-Kellie. La cavit\u00e9 cr\u00e2nienne d&rsquo;un adulte est une sph\u00e8re osseuse herm\u00e9tique et absolument inextensible de volume fixe. Ce volume est toujours rempli \u00e0 100 % par trois composants : le tissu c\u00e9r\u00e9bral (environ 80 %), le sang dans les vaisseaux (10 %) et le LCR (10 %).<\/p>\n\n<p class=\"wp-block-paragraph\">Selon les lois de la physique des fluides, l&rsquo;augmentation du volume de l&rsquo;un de ces composants (ou l&rsquo;apparition d&rsquo;un nouveau volume pathologique, comme un h\u00e9matome ou une tumeur) doit in\u00e9vitablement \u00eatre compens\u00e9e par une diminution \u00e9quivalente des autres composants. L&rsquo;organisme tente d&rsquo;abord de restaurer l&rsquo;\u00e9quilibre en r\u00e9duisant le volume du LCR et du sang veineux dans la cavit\u00e9 cr\u00e2nienne. Lorsque ce m\u00e9canisme est \u00e9puis\u00e9, la pression \u00e0 l&rsquo;int\u00e9rieur de la bo\u00eete cr\u00e2nienne commence \u00e0 augmenter rapidement et de mani\u00e8re incontr\u00f4l\u00e9e.<\/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\">Chez un adulte, en position allong\u00e9e, la PIC repr\u00e9sente normalement de 5 \u00e0 15 mm Hg. Une condition o\u00f9 elle d\u00e9passe continuellement 20 mm Hg est appel\u00e9e hypertension intracr\u00e2nienne.<\/p>\n\n<p class=\"wp-block-paragraph\">Une PIC \u00e9lev\u00e9e est extr\u00eamement dangereuse pour deux raisons. Premi\u00e8rement, elle emp\u00eache le sang art\u00e9riel de p\u00e9n\u00e9trer dans la cavit\u00e9 cr\u00e2nienne, provoquant une famine totale en oxyg\u00e8ne (isch\u00e9mie) et la mort c\u00e9r\u00e9brale. Deuxi\u00e8mement, elle pousse le tissu c\u00e9r\u00e9bral dans les ouvertures anatomiques \u00e0 la base du cr\u00e2ne (ph\u00e9nom\u00e8ne de hernie), entra\u00eenant une compression du tronc c\u00e9r\u00e9bral et un arr\u00eat respiratoire. Lors d&rsquo;un traumatisme s\u00e9v\u00e8re, le contr\u00f4le de la PIC est une priorit\u00e9 pour le r\u00e9animateur ; pour cela, des capteurs \u00e9lectroniques sp\u00e9ciaux sont implant\u00e9s directement dans le cerveau du patient.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La pression intracr\u00e2nienne (du latin <em>intra<\/em> \u2014 \u00e0 l&rsquo;int\u00e9rieur et <em>cranium<\/em> \u2014 cr\u00e2ne) est la pression physique exerc\u00e9e par le tissu c\u00e9r\u00e9bral, le sang qui y circule et le liquide c\u00e9phalorachidien (LCR) sur les parois rigides internes des os du cr\u00e2ne.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6904","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>Pression intracr\u00e2nienne : d\u00e9finition m\u00e9dicale et 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