{"id":6907,"date":"2026-05-04T16:12:19","date_gmt":"2026-05-04T13:12:19","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/pressao-intracraniana\/"},"modified":"2026-06-01T13:04:38","modified_gmt":"2026-06-01T10:04:38","slug":"pressao-intracraniana","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/pt\/glossario\/pressao-intracraniana\/","title":{"rendered":"Press\u00e3o intracraniana"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Press\u00e3o intracraniana (do latim <em>intra<\/em> \u2014 dentro e <em>cranium<\/em> \u2014 cr\u00e2nio) \u00e9 a press\u00e3o f\u00edsica exercida pelo tecido cerebral, pelo sangue circulante e pelo l\u00edquido cefalorraquidiano (l\u00edquor) nas paredes internas r\u00edgidas dos ossos do cr\u00e2nio.<\/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\">A fisiologia desse processo \u00e9 descrita pela doutrina fundamental de Monro-Kellie. A cavidade craniana de um adulto \u00e9 uma esfera \u00f3ssea herm\u00e9tica e absolutamente n\u00e3o expans\u00edvel de volume fixo. Este volume est\u00e1 sempre 100% preenchido por tr\u00eas componentes: tecido cerebral (aproximadamente 80%), sangue nos vasos (10%) e l\u00edquor (10%).<\/p>\n\n<p class=\"wp-block-paragraph\">De acordo com as leis da f\u00edsica dos fluidos, o aumento no volume de qualquer um desses componentes (ou a apari\u00e7\u00e3o de um novo volume patol\u00f3gico, como um hematoma ou tumor) inevitavelmente deve ser compensado por uma redu\u00e7\u00e3o equivalente dos outros componentes. O organismo inicialmente tenta restaurar o equil\u00edbrio reduzindo o volume de l\u00edquor e de sangue venoso na cavidade craniana. Quando esse mecanismo se esgota, a press\u00e3o dentro da caixa craniana come\u00e7a a aumentar rapidamente e de maneira incontrol\u00e1vel.<\/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\">Normalmente, em adultos na posi\u00e7\u00e3o deitada, a PIC varia de 5 a 15 mmHg. Uma condi\u00e7\u00e3o onde ela ultrapassa consistentemente 20 mmHg chama-se hipertens\u00e3o intracraniana.<\/p>\n\n<p class=\"wp-block-paragraph\">Uma PIC elevada \u00e9 extremamente perigosa por duas raz\u00f5es. Primeiramente, ela n\u00e3o permite que o sangue arterial penetre na cavidade craniana, causando uma priva\u00e7\u00e3o total de oxig\u00eanio (isquemia) e a morte cerebral. Em segundo lugar, ela comprime o tecido cerebral nos orif\u00edcios anat\u00f4micos da base do cr\u00e2nio (processo de hernia\u00e7\u00e3o), o que leva \u00e0 compress\u00e3o do tronco cerebral e a uma parada respirat\u00f3ria. Em casos de trauma grave, o controle da PIC \u00e9 a principal tarefa do intensivista; para isso, sensores eletr\u00f4nicos especiais s\u00e3o implantados diretamente no c\u00e9rebro do paciente.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Press\u00e3o intracraniana (do latim <em>intra<\/em> \u2014 dentro e <em>cranium<\/em> \u2014 cr\u00e2nio) \u00e9 a press\u00e3o f\u00edsica exercida pelo tecido cerebral, pelo sangue circulante e pelo l\u00edquido cefalorraquidiano (l\u00edquor) nas paredes internas r\u00edgidas dos ossos do cr\u00e2nio.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-6907","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>Press\u00e3o intracraniana: defini\u00e7\u00e3o m\u00e9dica e vis\u00e3o geral | Voka Wiki<\/title>\n<meta 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