{"id":51879,"date":"2023-10-12T07:23:01","date_gmt":"2023-10-12T07:23:01","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=51879"},"modified":"2026-02-03T07:23:33","modified_gmt":"2026-02-03T07:23:33","slug":"managing-progressive-keratoconus-in-thin-corneas","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/managing-progressive-keratoconus-in-thin-corneas\/","title":{"rendered":"Gerir o ceratocone progressivo em c\u00f3rneas finas"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"51879\" class=\"elementor elementor-51879\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-758d507a e-flex e-con-boxed e-con e-parent\" data-id=\"758d507a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-335e59ca elementor-widget elementor-widget-text-editor\" data-id=\"335e59ca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\n<p>Um artigo recentemente publicado na <a href=\"https:\/\/biermann-medizin.de\/fachbereich\/ophthalmologie\/\">Not\u00edcias de Oftalmologia<\/a> analisou o estado atual do cross-linking corneano (CXL) em doentes com ceratocone progressivo e c\u00f3rneas finas ou ultra-finas - um grupo historicamente exclu\u00eddo dos protocolos de tratamento padr\u00e3o. A revis\u00e3o, da autoria do diretor m\u00e9dico da ELZA, <a href=\"https:\/\/www.elza-institute.com\/de-ch\/ueber-elza\/farhad-hafezi\/\">Farhad Hafezi, MD, PhD, FARVO<\/a>, O programa Dresden, aborda um desafio cl\u00ednico de longa data: como estabilizar com seguran\u00e7a a progress\u00e3o da ectasia quando a espessura do estroma desce abaixo do limiar convencional de 400 \u00b5m exigido pelo protocolo de Dresden.<\/p>\n\n\n\n<p>O CXL padr\u00e3o sem epit\u00e9lio baseia-se na manuten\u00e7\u00e3o de uma margem de seguran\u00e7a do estroma posterior n\u00e3o reticulado de aproximadamente 70 \u00b5m para proteger o endot\u00e9lio da c\u00f3rnea da exposi\u00e7\u00e3o aos raios UV-A. Este requisito tem tradicionalmente limitado as op\u00e7\u00f5es de tratamento para o ceratocone avan\u00e7ado, deixando muitas vezes a ceratoplastia como a \u00fanica interven\u00e7\u00e3o restante. Ao longo da \u00faltima d\u00e9cada, v\u00e1rias t\u00e9cnicas tentaram alargar a elegibilidade do CXL a c\u00f3rneas mais finas, incluindo a dilata\u00e7\u00e3o do estroma com riboflavina hipo-osmolar, o CXL assistido por lentes de contacto e abordagens que preservam as ilhas epiteliais nas regi\u00f5es mais finas.<\/p>\n\n\n\n<p>O artigo do Ophthalmologische Nachrichten analisa criticamente estes m\u00e9todos e destaca as suas limita\u00e7\u00f5es, incluindo altera\u00e7\u00f5es paquim\u00e9tricas imprevis\u00edveis, disponibilidade reduzida de oxig\u00e9nio e endurecimento biomec\u00e2nico menos consistente. Uma mudan\u00e7a concetual fundamental discutida na revis\u00e3o \u00e9 o afastamento da modifica\u00e7\u00e3o da c\u00f3rnea para se adaptar \u00e0 t\u00e9cnica, em dire\u00e7\u00e3o \u00e0 adapta\u00e7\u00e3o do pr\u00f3prio protocolo CXL \u00e0s propriedades individuais da c\u00f3rnea.<\/p>\n\n\n\n<p>O ponto central desta abordagem \u00e9 a reticula\u00e7\u00e3o individualizada utilizando o protocolo sub400. Em vez de impor uma espessura m\u00ednima fixa, o protocolo ajusta o tempo de irradia\u00e7\u00e3o UV-A com base na espessura do estroma, mantendo a intensidade de irradia\u00e7\u00e3o padr\u00e3o. Esta estrat\u00e9gia algor\u00edtmica modela a intera\u00e7\u00e3o entre a energia UV-A, a absor\u00e7\u00e3o de riboflavina e a difus\u00e3o de oxig\u00e9nio, permitindo que a reticula\u00e7\u00e3o seja confinada ao estroma anterior, preservando simultaneamente uma margem de seguran\u00e7a endotelial.<\/p>\n\n\n\n<p>Os dados cl\u00ednicos resumidos na revis\u00e3o relatam altas taxas de estabilidade tomogr\u00e1fica em c\u00f3rneas finas e ultrafinas, incluindo olhos com espessuras de estroma bem abaixo de 400 \u00b5m. Os dados de acompanhamento at\u00e9 dois anos mostram uma estabiliza\u00e7\u00e3o sustentada sem evid\u00eancia de descompensa\u00e7\u00e3o endotelial, e uma correla\u00e7\u00e3o entre o tempo de irradia\u00e7\u00e3o e a profundidade da linha de demarca\u00e7\u00e3o apoia a previsibilidade desta abordagem individualizada.<\/p>\n\n\n\n<p>Do ponto de vista cl\u00ednico, a revis\u00e3o ressalta a relev\u00e2ncia de estrat\u00e9gias personalizadas de CXL para pacientes com doen\u00e7a avan\u00e7ada, particularmente indiv\u00edduos mais jovens em risco de progress\u00e3o r\u00e1pida. Ao alargar a elegibilidade para a estabiliza\u00e7\u00e3o biomec\u00e2nica, os protocolos individualizados podem reduzir a necessidade de transplante de c\u00f3rnea em casos selecionados.<\/p>\n\n\n\n<p>No Instituto ELZA, esses conceitos s\u00e3o aplicados dentro de uma estrutura estruturada e baseada em evid\u00eancias para o tratamento do ceratocone. A revis\u00e3o do Ophthalmologische Nachrichten reflete a tend\u00eancia mais ampla de personaliza\u00e7\u00e3o do protocolo no cross-linking corneano, enfatizando a seguran\u00e7a, a transpar\u00eancia e o alinhamento com os princ\u00edpios fotoqu\u00edmicos estabelecidos.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fb44dfe elementor-widget elementor-widget-gallery\" data-id=\"fb44dfe\" data-element_type=\"widget\" data-e-type=\"widget\" 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class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Uma an\u00e1lise recente do Ophthalmologische Nachrichten examina estrat\u00e9gias individualizadas de CXL para o ceratocone progressivo em c\u00f3rneas finas.<\/p>","protected":false},"author":4,"featured_media":51881,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[214,1],"tags":[352,100,1539,123,851,1538,353,423,1491],"class_list":["post-51879","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-farhad-hafezi","category-general-news","tag-corneal-cross-linking","tag-cxl","tag-individualized-cxl","tag-keratoconus","tag-ophthalmologische-nachrichten","tag-progressive-keratoconus","tag-sub400","tag-thin-cornea","tag-ultra-thin-cornea"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Managing Progressive Keratoconus in Thin Corneas - The ELZA Institute<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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