{"id":7408,"date":"2026-07-23T14:02:46","date_gmt":"2026-07-23T11:02:46","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/barreira-placentaria\/"},"modified":"2026-07-23T14:02:52","modified_gmt":"2026-07-23T11:02:52","slug":"barreira-placentaria","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/pt\/glossario\/barreira-placentaria\/","title":{"rendered":"Barreira placent\u00e1ria"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A barreira placent\u00e1ria (do grego <em>plakus<\/em> \u2014 bolo) \u00e9 uma barreira entre o sangue da gr\u00e1vida e do feto na placenta, que possui permeabilidade seletiva em dois sentidos.<\/p>\n\n<p class=\"wp-block-paragraph\">Atua como um filtro que garante a nutri\u00e7\u00e3o e respira\u00e7\u00e3o do organismo em desenvolvimento, ao mesmo tempo que o protege contra a maioria dos microrganismos.<\/p>\n\n<h2 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;\" class=\"wp-block-heading\"><strong>Etiologia e fisiopatologia<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">A base morfol\u00f3gica da barreira \u00e9 composta pelos tecidos das vilosidades cori\u00f4nicas do feto, que entram em contato com o sangue materno. <\/p>\n\n<p class=\"wp-block-paragraph\">A permeabilidade da barreira muda durante a gravidez, aumentando significativamente no terceiro trimestre.<\/p>\n\n<p class=\"wp-block-paragraph\">A barreira possui uma seletividade imunol\u00f3gica \u00fanica. Por exemplo, ela permite a passagem ativa de anticorpos maternos da classe IgG, garantindo ao rec\u00e9m-nascido imunidade passiva. No entanto, anticorpos maiores da classe IgM n\u00e3o passam por ela. <\/p>\n\n<h2 id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\" class=\"wp-block-heading\"><strong>Import\u00e2ncia cl\u00ednica<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">O estado da barreira placent\u00e1ria determina o risco de infec\u00e7\u00e3o intrauterina. Na pr\u00e1tica m\u00e9dica, isto \u00e9 fundamental em v\u00e1rios aspectos:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>aten\u00e7\u00e3o \u00e0s infec\u00e7\u00f5es TORCH<\/strong> \u2014 os pat\u00f3genos dessas doen\u00e7as conseguem superar a prote\u00e7\u00e3o placent\u00e1ria e causar graves malforma\u00e7\u00f5es;<\/li>\n\n\n\n<li><strong>avalia\u00e7\u00e3o da seguran\u00e7a de medicamentos<\/strong> \u2014 ao prescrever medicamentos para gestantes, o fator chave \u00e9 a capacidade da mol\u00e9cula atravessar a barreira placent\u00e1ria;<\/li>\n\n\n\n<li><strong>cria\u00e7\u00e3o de um &#8220;escudo de medicamentos&#8221;<\/strong> \u2014 a terapia de certas infec\u00e7\u00f5es em gr\u00e1vidas visa manter a concentra\u00e7\u00e3o do medicamento impedindo a passagem do microrganismo para o feto.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A barreira placent\u00e1ria (do grego <em>plakus<\/em> \u2014 bolo) \u00e9 uma barreira entre o sangue da gr\u00e1vida e do feto na placenta, que possui permeabilidade seletiva em dois sentidos.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-7408","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 v27.8) - 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