{"id":21578,"date":"2026-08-04T07:00:00","date_gmt":"2026-08-04T07:00:00","guid":{"rendered":"https:\/\/endoscopiaterapeutica.net\/pt\/?p=21578"},"modified":"2026-08-03T22:55:58","modified_gmt":"2026-08-03T22:55:58","slug":"sindrome-da-alca-aferente","status":"publish","type":"post","link":"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/sindrome-da-alca-aferente\/","title":{"rendered":"S\u00edndrome da al\u00e7a aferente: revis\u00e3o cl\u00ednica e abordagem endosc\u00f3pica"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Autores:<\/strong> <em> <\/em>Ada Alexandrina Brom dos Santos Soares, Adrielma Athena Rodrigues Serr\u00e3o Martins e Silva, Paulo Sakai, Carlos Kiyoshi Furuya Junior, Bruno da Costa Martins<\/p>\n\n\n\n<h2 id=\"h-introducao\" class=\"wp-block-heading\"><strong>Introdu\u00e7\u00e3o<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A s\u00edndrome da al\u00e7a aferente (SAA) \u00e9 uma complica\u00e7\u00e3o incomum decorrente de obstru\u00e7\u00e3o mec\u00e2nica da al\u00e7a aferente, com distens\u00e3o secund\u00e1ria ao ac\u00famulo de bile e secre\u00e7\u00f5es pancreatoent\u00e9ricas (Figura 1). Sua incid\u00eancia varia de 0,2% a 1%, sobretudo ap\u00f3s reconstru\u00e7\u00f5es gastrojejunais \u00e0 Billroth II ou em Y-de-Roux, bem como ap\u00f3s duodenopancreatectomia.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/?attachment_id=21581\"><img fetchpriority=\"high\" decoding=\"async\" width=\"301\" height=\"609\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Ilustracao-esquematica-de-reconstrucao-gastrojejunal.png\" alt=\"Ilustra\u00e7\u00e3o esquem\u00e1tica da S\u00edndrome da Al\u00e7a Aferente\" class=\"wp-image-21581\" srcset=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Ilustracao-esquematica-de-reconstrucao-gastrojejunal.png 301w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Ilustracao-esquematica-de-reconstrucao-gastrojejunal-148x300.png 148w\" sizes=\"(max-width: 301px) 100vw, 301px\" \/><\/a><figcaption class=\"wp-element-caption\"><br><strong>Figura 1: <\/strong>Ilustra\u00e7\u00e3o esquem\u00e1tica de reconstru\u00e7\u00e3o gastrojejunal \u00e0 Billroth II, evidenciando obstru\u00e7\u00e3o pr\u00f3xima \u00e0 anastomose (seta azul), com dilata\u00e7\u00e3o da al\u00e7a aferente e ac\u00famulo de conte\u00fado biliopancre\u00e1tico.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 id=\"h-etiologia\" class=\"wp-block-heading\"><strong>Etiologia<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As etiologias benignas incluem causas intraluminais, intramurais e extr\u00ednsecas, destacando-se enterite por radia\u00e7\u00e3o, tor\u00e7\u00e3o da al\u00e7a aferente, ader\u00eancias p\u00f3s-operat\u00f3rias, h\u00e9rnia interna, volvo e intussuscep\u00e7\u00e3o. Entre as etiologias malignas, predominam carcinomatose peritoneal e recorr\u00eancia tumoral locorregional.<\/p>\n\n\n\n<h2 id=\"h-quadro-clinico\" class=\"wp-block-heading\"><strong>Quadro cl\u00ednico<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A obstru\u00e7\u00e3o completa geralmente se manifesta de forma aguda, com dor epig\u00e1strica, frequentemente irradiada para a regi\u00e3o interescapular, associada a v\u00f4mitos n\u00e3o biliosos. Desse modo, o ac\u00famulo de secre\u00e7\u00f5es promove aumento da press\u00e3o intraluminal, com poss\u00edvel evolu\u00e7\u00e3o para pancreatite e colangite ascendente. Al\u00e9m disso, nos casos mais graves, pode ocorrer isquemia intestinal, seguida de perfura\u00e7\u00e3o e peritonite.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A obstru\u00e7\u00e3o parcial apresenta curso cr\u00f4nico, caracterizado por desconforto periumbilical p\u00f3s-prandial. Ademais, a estase de secre\u00e7\u00f5es favorece o supercrescimento bacteriano, com evolu\u00e7\u00e3o para desnutri\u00e7\u00e3o, defici\u00eancia de vitamina B12&nbsp;e esteatorreia. Em contrapartida, a descompress\u00e3o s\u00fabita da al\u00e7a aferente resulta em v\u00f4mitos biliosos em jato.<\/p>\n\n\n\n<h2 id=\"h-diagnostico\" class=\"wp-block-heading\"><strong>Diagn\u00f3stico<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nesse sentido, a tomografia computadorizada abdominal constitui o principal m\u00e9todo diagn\u00f3stico da s\u00edndrome da al\u00e7a aferente, permitindo confirmar a obstru\u00e7\u00e3o, definir sua etiologia e identificar complica\u00e7\u00f5es associadas. Os principais achados tomogr\u00e1ficos incluem dilata\u00e7\u00e3o da al\u00e7a aferente que atravessa a linha m\u00e9dia entre a aorta e a art\u00e9ria mesent\u00e9rica superior; proje\u00e7\u00e3o das v\u00e1lvulas coniventes para o l\u00famen; espessamento da parede intestinal ou les\u00e3o obstrutiva na anastomose; dilata\u00e7\u00e3o do trato pancreatobiliar (Figura 2); linfadenopatia, ascite, realce peritoneal e les\u00f5es metast\u00e1ticas.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/?attachment_id=21582\"><img decoding=\"async\" width=\"750\" height=\"767\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tomografia-computadorizada.jpg\" alt=\"\" class=\"wp-image-21582\" srcset=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tomografia-computadorizada.jpg?v=1782769697 750w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tomografia-computadorizada-293x300.jpg?v=1782769697 293w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tomografia-computadorizada-585x598.jpg?v=1782769697 585w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/a><figcaption class=\"wp-element-caption\"><br><strong>Figura 2:<\/strong> Tomografia computadorizada demonstrando dilata\u00e7\u00e3o da via biliar e do ducto pancre\u00e1tico, associada a acentuada distens\u00e3o do duodeno e jejuno proximal at\u00e9 pr\u00f3ximo da anastomose gastroent\u00e9rica.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 id=\"h-tratamento\" class=\"wp-block-heading\"><strong>Tratamento<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A cirurgia permanece como o principal tratamento para a s\u00edndrome da al\u00e7a aferente. Entretanto, avan\u00e7os nas interven\u00e7\u00f5es endosc\u00f3picas ampliaram as op\u00e7\u00f5es terap\u00eauticas minimamente invasivas. As abordagens endosc\u00f3picas incluem dilata\u00e7\u00e3o com bal\u00e3o da \u00e1rea estenosada, drenagem do segmento obstru\u00eddo com sonda nasog\u00e1strica, coloca\u00e7\u00e3o de stents met\u00e1licos autoexpans\u00edveis por enteroscopia e cria\u00e7\u00e3o de anastomose entre o segmento dilatado e a luz g\u00e1strica ou jejunal por ecoendoscopia, com utiliza\u00e7\u00e3o de pr\u00f3tese met\u00e1lica de aposi\u00e7\u00e3o luminal (LAMS) (Figura 3). Vale ressaltar que estudos multic\u00eantricos iniciais demonstram elevadas taxas de sucesso t\u00e9cnico e cl\u00ednico dessa abordagem.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/?attachment_id=21583\"><img decoding=\"async\" width=\"1024\" height=\"354\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS-1024x354.jpg\" alt=\"\" class=\"wp-image-21583\" srcset=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS-1024x354.jpg?v=1782769878 1024w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS-300x104.jpg?v=1782769878 300w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS-768x266.jpg?v=1782769878 768w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS-1170x405.jpg?v=1782769878 1170w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS-585x203.jpg?v=1782769878 585w, https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2026\/06\/Tratamento-ecoendoscopico-da-SAA-com-colocacao-de-LAMS.jpg?v=1782769878 1193w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\"><br><strong>Figura 3: <\/strong>Tratamento ecoendosc\u00f3pico da SAA com coloca\u00e7\u00e3o de LAMS. A ilustra\u00e7\u00e3o A apresenta o posicionamento do ecoendosc\u00f3pio na al\u00e7a eferente para pun\u00e7\u00e3o. A imagem ecoendosc\u00f3pica B demonstra a realiza\u00e7\u00e3o da enteroenteroanastomose por pun\u00e7\u00e3o, com coloca\u00e7\u00e3o da LAMS. A ilustra\u00e7\u00e3o C esquematiza a pr\u00f3tese comunicando as duas al\u00e7as. A imagem endosc\u00f3pica D evidencia o adequado posicionamento da pr\u00f3tese, com boa drenagem do conte\u00fado biliopancre\u00e1tico.<\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Desse modo, apresentamos um v\u00eddeo do tratamento endosc\u00f3pico da SAA com LAMS por meio de anastomose enteroent\u00e9rica guiada por ecoendoscopia.<\/p>\n\n\n\n<div style=\"position:relative;padding-top:56.25%;\"><iframe id=\"panda-6cd1369a-4c9c-4f78-9553-8ecaf7fa722c\" src=\"https:\/\/player-vz-a75e9d45-986.tv.pandavideo.com.br\/embed\/?v=6cd1369a-4c9c-4f78-9553-8ecaf7fa722c\" style=\"border:none;position:absolute;top:0;left:0;\" allow=\"accelerometer;gyroscope;autoplay;encrypted-media;picture-in-picture\" allowfullscreen=true width=\"100%\" height=\"100%\" fetchpriority=\"high\"><\/iframe><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para saber mais sobre os desfechos do tratamento ecoendosc\u00f3pico da SAA, acesse a metan\u00e1lise <a href=\"https:\/\/www.frontiersin.org\/journals\/gastroenterology\/articles\/10.3389\/fgstr.2026.1853386\/full\">&#8220;EUS-guided transmural treatment of afferent loop syndrome: a systematic review and meta-analysis&#8221;<\/a> (Frontiers in Gastroenterology, 2026)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 id=\"h-referencias\" class=\"wp-block-heading\"><strong>Refer\u00eancias<\/strong><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Grotewiel RK, Cindass R. Afferent loop syndrome. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023. <\/li>\n\n\n\n<li>Termsinsuk P, Chantarojanasiri T, Pausawasdi N. Diagnosis and treatment of the afferent loop syndrome. Clin J Gastroenterol. 2020;13(5):660-668. doi:10.1007\/s12328-020-01170-z. <\/li>\n\n\n\n<li>Wu CCH, Brindise E, Abiad RE, Khashab MA. The role of endoscopic management in afferent loop syndrome. Gut Liver. 2023;17(3):351-359. doi:10.5009\/gnl220205. <\/li>\n\n\n\n<li>Matsubara S, Takahashi S, Takahara N, et al. Endoscopic ultrasound-guided gastrojejunostomy for malignant afferent loop syndrome using a fully covered metal stent: a multicenter experience. J Clin Med. 2023;12(10):3524. doi:10.3390\/jcm12103524.<\/li>\n<\/ol>\n\n\n\n<h2 id=\"h-como-citar-este-artigo\" class=\"wp-block-heading\"><strong>Como citar este artigo<\/strong><\/h2>\n\n\n\n<p class=\"has-very-light-gray-to-cyan-bluish-gray-gradient-background has-background wp-block-paragraph\">Soares AABS, Silva AARSM, Sakai P, Junior CKF, Martins BC.S\u00edndrome da al\u00e7a aferente: revis\u00e3o cl\u00ednica e abordagem endosc\u00f3pica. Endoscopia Terapeutica 2026 Vol II. Dispon\u00edvel em: <a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/?p=21578\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/sindrome-da-alca-aferente-revisao-clinica-e-abordagem-endoscopica\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Autores: Ada Alexandrina Brom dos Santos Soares, Adrielma Athena Rodrigues Serr\u00e3o Martins e Silva,&hellip;<\/p>\n","protected":false},"author":6017,"featured_media":21582,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[151,150],"tags":[881,356,870],"ano":[847],"tipo":[154],"volume":[147],"class_list":["post-21578","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-assuntosgerais","category-casosclinicos","tag-alca-aferente","tag-ecoendoscopia","tag-lams","ano-847","tipo-ecoendoscopia","volume-volume-ii"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>S\u00edndrome da Al\u00e7a Aferente: Diagn\u00f3stico e Tratamento<\/title>\n<meta name=\"description\" content=\"A s\u00edndrome da al\u00e7a aferente \u00e9 uma complica\u00e7\u00e3o rara e grave. 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