{"id":17682,"date":"2026-09-16T00:43:34","date_gmt":"2026-09-16T00:43:34","guid":{"rendered":"https:\/\/atlasemhematologia.com.br\/blog\/?p=17682"},"modified":"2026-09-16T00:43:35","modified_gmt":"2026-09-16T00:43:35","slug":"anemia-megaloblastica-2","status":"publish","type":"post","link":"https:\/\/atlasemhematologia.com.br\/blog\/anemia-megaloblastica-2\/","title":{"rendered":"Anemia Megalobl\u00e1stica"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A anemia megalobl\u00e1stica \u00e9 uma condi\u00e7\u00e3o que resulta no comprometimento da s\u00edntese de DNA nas c\u00e9lulas hematopo\u00e9ticas, causado predominantemente pela defici\u00eancia de vitamina B12 e\/ou de \u00e1cido f\u00f3lico. Sem esses nutrientes, as c\u00e9lulas n\u00e3o conseguem se dividir normalmente.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Elas crescem em volume, mas n\u00e3o completam a matura\u00e7\u00e3o, gerando uma hematopoese ineficaz. O hemograma reflete esse processo de forma caracter\u00edstica, com macrocitose expressiva e pancitopenia em casos avan\u00e7ados. Trata-se de uma condi\u00e7\u00e3o frequente, subdiagnosticada em grupos vulner\u00e1veis e com apresenta\u00e7\u00e3o laboratorial que exige aten\u00e7\u00e3o cuidadosa para n\u00e3o ser confundida com outras causas de anemia macroc\u00edtica.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1030\" height=\"792\" src=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/09\/image-4-1030x792.png\" alt=\"\" class=\"wp-image-17683\" style=\"aspect-ratio:1.3018372703412073;width:496px;height:auto\" srcset=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/09\/image-4-1030x792.png 1030w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/09\/image-4-300x231.png 300w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/09\/image-4-768x590.png 768w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/09\/image-4.png 1054w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Fisiopatologia e grupos de risco: quem adoece e por qu\u00ea<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A vitamina B12 e o \u00e1cido f\u00f3lico atuam como coenzimas nas rea\u00e7\u00f5es de s\u00edntese de timidina, nucleot\u00eddeo essencial para a produ\u00e7\u00e3o de DNA. Quando um desses cofatores est\u00e1 ausente, a s\u00edntese de DNA fica comprometida, mas a produ\u00e7\u00e3o de RNA e prote\u00ednas continua. O resultado \u00e9 uma c\u00e9lula que cresce sem se dividir adequadamente, fen\u00f4meno denominado dissocia\u00e7\u00e3o nucleocitoplasm\u00e1tica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A defici\u00eancia de vitamina B12 \u00e9 mais comum em idosos, pela redu\u00e7\u00e3o da acidez g\u00e1strica e da produ\u00e7\u00e3o de fator intr\u00ednseco; em vegetarianos estritos, pela aus\u00eancia de fontes alimentares animais; e em pacientes submetidos a gastrectomia ou cirurgia bari\u00e1trica, pela perda da mucosa g\u00e1strica produtora de fator intr\u00ednseco.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A defici\u00eancia de folato \u00e9 mais frequente em gestantes, pela demanda aumentada; em alcoolistas cr\u00f4nicos, pela m\u00e1 absor\u00e7\u00e3o e dieta inadequada; e em pacientes em uso de metotrexato e outros antagonistas do folato. A distin\u00e7\u00e3o entre as duas defici\u00eancias tem implica\u00e7\u00e3o cl\u00ednica direta: a reposi\u00e7\u00e3o isolada de folato em paciente com defici\u00eancia de B12 pode corrigir a anemia, mas n\u00e3o previne as manifesta\u00e7\u00f5es neurol\u00f3gicas, associadas a defici\u00eancia de B12.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Achados do hemograma e do esfrega\u00e7o na anemia megalobl\u00e1stica<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">O hemograma na anemia megalobl\u00e1stica apresenta macrocitose expressiva, com VCM frequentemente acima de 110 fL e, em casos graves, ultrapassando 130 fL. O RDW est\u00e1 elevado, refletindo a anisocitose caracter\u00edstica. A reticulocitose est\u00e1 ausente ou inadequada para o grau de anemia, pois a eritropoese \u00e9 ineficaz. Nos casos mais avan\u00e7ados, a plaquetopenia e a leucopenia se somam \u00e0 anemia, configurando pancitopenia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O esfrega\u00e7o de sangue perif\u00e9rico \u00e9 fundamental para o diagn\u00f3stico. Os macro-oval\u00f3citos s\u00e3o o achado eritrocit\u00e1rio mais caracter\u00edstico. A hipersegmenta\u00e7\u00e3o dos neutr\u00f3filos, definida pela presen\u00e7a de n\u00facleos com cinco l\u00f3bulos em mais de 3% dos neutr\u00f3filos, ou de qualquer neutr\u00f3filo com seis ou mais l\u00f3bulos, \u00e9 um marcador precoce da defici\u00eancia de B12 ou folato. Esse achado pode preceder a macrocitose e a anemia, tornando-se o primeiro sinal morfol\u00f3gico da car\u00eancia.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Diagn\u00f3stico diferencial e confirma\u00e7\u00e3o laboratorial<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A macrocitose n\u00e3o \u00e9 exclusiva da anemia megalobl\u00e1stica. Hepatopatias, hipotireoidismo, alcoolismo cr\u00f4nico, uso de medicamentos mielossupressores e s\u00edndromes mielodispl\u00e1sicas tamb\u00e9m cursam com VCM elevado. A distin\u00e7\u00e3o entre essas causas depende da integra\u00e7\u00e3o cl\u00ednica e da dosagem de vitamina B12, \u00e1cido f\u00f3lico s\u00e9rico e eritrocit\u00e1rio.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A dosagem de \u00e1cido metilmal\u00f4nico e homociste\u00edna s\u00e9rica s\u00e3o marcadores funcionais que se elevam antes mesmo da queda dos n\u00edveis s\u00e9ricos de B12, aumentando a sensibilidade diagn\u00f3stica em casos de defici\u00eancia subcl\u00ednica. A homociste\u00edna eleva-se nas defici\u00eancias tanto de B12 quanto de folato; o \u00e1cido metilmal\u00f4nico eleva-se na defici\u00eancia de B12, mas n\u00e3o no d\u00e9ficit de folatos, permitindo assim uma diferencia\u00e7\u00e3o mais direta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/eventos.atlasemhematologia.com.br\/listadeesperatimeblogatlas\"><img decoding=\"async\" width=\"1030\" height=\"276\" src=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-1030x276.png\" alt=\"\" class=\"wp-image-17314\" srcset=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-1030x276.png 1030w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-300x80.png 300w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-768x206.png 768w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-1536x411.png 1536w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-2048x549.png 2048w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Refer\u00eancias<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OLIVEIRA, Larissa Santana; ALCANTARA, Thiago Ruan de Lima. <em>Atlas em hematologia: um guia visual para a identifica\u00e7\u00e3o de c\u00e9lulas sangu\u00edneas<\/em>. 1. ed. Salvador: Oxente, 2025.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MONTEIRO, Mirella Dias et al. Anemia megalobl\u00e1stica: revis\u00e3o de literatura. <strong>Revista Sa\u00fade em Foco. Ed<\/strong>, n. 11, p. 934-963, 2019.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DE PAZ, Raquel; CANALES, Miguel A.; HERN\u00c1NDEZ-NAVARRO, Fernando. Anemia megalobl\u00e1stica. <strong>Medicina cl\u00ednica<\/strong>, v. 127, n. 5, p. 185-188, 2006.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CASTRO, Mar\u00eda Jos\u00e9 Mar\u00edn. Anemia Megalobl\u00e1stica, generalidades y su relaci\u00f3n con el d\u00e9ficit neurol\u00f3gico. <strong>Archivos de Medicina (Manizales)<\/strong>, v. 19, n. 2, 2019.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A anemia megalobl\u00e1stica \u00e9 uma condi\u00e7\u00e3o que resulta no comprometimento da s\u00edntese de DNA nas c\u00e9lulas hematopo\u00e9ticas, causado predominantemente pela defici\u00eancia de vitamina B12 e\/ou de \u00e1cido f\u00f3lico. Sem esses nutrientes, as c\u00e9lulas n\u00e3o conseguem se dividir normalmente.&nbsp; Elas crescem em volume, mas n\u00e3o completam a matura\u00e7\u00e3o, gerando uma hematopoese ineficaz. O hemograma reflete esse [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":17684,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-17682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-anemias"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Anemia Megalobl\u00e1stica - Blog - Atlas em Hematologia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atlasemhematologia.com.br\/blog\/anemia-megaloblastica-2\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Anemia Megalobl\u00e1stica - Blog - Atlas em Hematologia\" \/>\n<meta property=\"og:description\" content=\"A anemia megalobl\u00e1stica \u00e9 uma condi\u00e7\u00e3o que resulta no comprometimento da s\u00edntese de DNA nas c\u00e9lulas hematopo\u00e9ticas, causado predominantemente pela defici\u00eancia de vitamina B12 e\/ou de \u00e1cido f\u00f3lico. Sem esses nutrientes, as c\u00e9lulas n\u00e3o conseguem se dividir normalmente.&nbsp; Elas crescem em volume, mas n\u00e3o completam a matura\u00e7\u00e3o, gerando uma hematopoese ineficaz. 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