{"id":51911,"date":"2025-02-03T08:48:03","date_gmt":"2025-02-03T08:48:03","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=51911"},"modified":"2026-02-03T08:52:57","modified_gmt":"2026-02-03T08:52:57","slug":"md-roundtable-the-role-of-cross-linking-in-infectious-keratitis","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/md-roundtable-the-role-of-cross-linking-in-infectious-keratitis\/","title":{"rendered":"MD Roundtable - O papel do Cross-Linking na queratite infecciosa"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"51911\" class=\"elementor elementor-51911\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-52168f35 e-flex e-con-boxed e-con e-parent\" data-id=\"52168f35\" 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-2d1657be elementor-widget elementor-widget-text-editor\" data-id=\"2d1657be\" 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<p><\/p>\n<p>O cross-linking da c\u00f3rnea (CXL) est\u00e1 amplamente estabelecido como um tratamento biomec\u00e2nico para o ceratocone e outras ectasias da c\u00f3rnea. O seu papel na queratite infecciosa, no entanto, continua a ser uma \u00e1rea de investiga\u00e7\u00e3o e debate activos. Uma recente mesa redonda de peritos publicada na <a href=\"https:\/\/www.aao.org\/eyenet\">EyeNet<\/a> A revista re\u00fane perspectivas cl\u00ednicas e de investiga\u00e7\u00e3o sobre quando, como e se a reticula\u00e7\u00e3o baseada em crom\u00f3foros fotoactivados deve ser utilizada em doen\u00e7as infecciosas da c\u00f3rnea.<\/p>\n<p><\/p>\n<p><\/p>\n<p>A justifica\u00e7\u00e3o para o CXL na queratite infecciosa vai para al\u00e9m do endurecimento da c\u00f3rnea. Para al\u00e9m de aumentar a resist\u00eancia biomec\u00e2nica, o CXL aumenta a resist\u00eancia do estroma \u00e0 digest\u00e3o enzim\u00e1tica, gera esp\u00e9cies reactivas de oxig\u00e9nio e induz danos fotoqu\u00edmicos no ADN e ARN microbianos. Estes efeitos s\u00e3o particularmente relevantes em infec\u00e7\u00f5es graves associadas \u00e0 fus\u00e3o da c\u00f3rnea, em que a degrada\u00e7\u00e3o estrutural, e n\u00e3o apenas a carga microbiana, amea\u00e7a a integridade do globo.<\/p>\n<p><\/p>\n<p><\/p>\n<p>Os resultados cl\u00ednicos relatados na literatura t\u00eam sido inconsistentes, em grande parte devido \u00e0 heterogeneidade no desenho do estudo, nos organismos causadores e - criticamente - nos protocolos de tratamento. Grande parte do trabalho cl\u00ednico inicial baseou-se na flu\u00eancia padr\u00e3o de Dresden de 5,4 J\/cm\u00b2. Os dados experimentais discutidos na mesa redonda indicam que n\u00edveis de flu\u00eancia mais elevados (10-15 J\/cm\u00b2) produzem efeitos antimicrobianos substancialmente maiores, com aumentos exponenciais nas taxas de morte microbiana observadas em modelos laboratoriais.<\/p>\n<p><\/p>\n<p><\/p>\n<p>A efic\u00e1cia tamb\u00e9m parece depender fortemente do organismo causador e do crom\u00f3foro utilizado. O CXL mediado por riboflavina mostra uma maior atividade contra agentes patog\u00e9nicos bacterianos, enquanto as abordagens fotodin\u00e2micas baseadas em rosa bengala demonstram efeitos superiores contra fungos e possivelmente Acanthamoeba, embora com uma penetra\u00e7\u00e3o mais superficial. As diferen\u00e7as nos espectros de absor\u00e7\u00e3o e na profundidade de penetra\u00e7\u00e3o no estroma complicam as compara\u00e7\u00f5es diretas e sublinham a import\u00e2ncia da sele\u00e7\u00e3o do protocolo.<\/p>\n<p><\/p>\n<p><\/p>\n<p>Um conceito-chave enfatizado na discuss\u00e3o \u00e9 o PACK-CXL (photoactivated chromophore for keratitis-corneal cross-linking), um termo deliberadamente escolhido para refletir a flexibilidade na escolha do crom\u00f3foro, em vez de depender apenas da riboflavina. Os novos trabalhos experimentais e cl\u00ednicos iniciais sugerem que a combina\u00e7\u00e3o de crom\u00f3foros, como a riboflavina e o rosa bengala, em flu\u00eancias mais elevadas pode aumentar a resist\u00eancia \u00e0 digest\u00e3o enzim\u00e1tica e melhorar o controlo da infe\u00e7\u00e3o em casos refract\u00e1rios selecionados. No entanto, estas abordagens continuam a ser objeto de investiga\u00e7\u00e3o e exigem uma an\u00e1lise cuidadosa da seguran\u00e7a endotelial e da profundidade da \u00falcera.<\/p>\n<p><\/p>\n<p><\/p>\n<p>\u00c9 importante salientar que todos os membros do painel concordaram que, atualmente, o CXL deve ser considerado como um complemento ao <a href=\"https:\/\/www.elza-institute.com\/pt\/cirurgia-da-cornea\/corneal-infection-keratitis\/\">tratamento antimicrobiano na queratite infecciosa<\/a> em vez de a substituir. A calendariza\u00e7\u00e3o parece ser cr\u00edtica: uma interven\u00e7\u00e3o mais precoce nas \u00falceras superficiais e n\u00e3o virais pode melhorar os resultados, ao passo que as infec\u00e7\u00f5es avan\u00e7adas, profundas ou virais acarretam riscos mais elevados e benef\u00edcios menos previs\u00edveis.<\/p>\n<p><\/p>\n<p><\/p>\n<p>No ELZA, as abordagens baseadas no CXL para a queratite infecciosa s\u00e3o consideradas no \u00e2mbito de um quadro estruturado e baseado em provas que d\u00e1 prioridade ao tipo de organismo, \u00e0 profundidade da \u00falcera e \u00e0s margens de seguran\u00e7a. A mesa redonda reflecte o estado atual do campo: l\u00f3gica mecanicista promissora, protocolos em evolu\u00e7\u00e3o e a necessidade de ensaios cl\u00ednicos rigorosamente concebidos e adequados \u00e0 flu\u00eancia antes de uma ado\u00e7\u00e3o mais ampla.<\/p>\n<p><\/p>\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-859c6aa elementor-widget elementor-widget-gallery\" data-id=\"859c6aa\" data-element_type=\"widget\" data-e-type=\"widget\" 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decoding=\"async\" width=\"500\" height=\"240\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2026\/02\/eyenet.gif\" class=\"attachment-large size-large wp-image-51917\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\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>Revis\u00e3o por peritos no Eyenet do cross-linking da c\u00f3rnea como tratamento adjuvante da queratite infecciosa e do derretimento da c\u00f3rnea.<\/p>","protected":false},"author":4,"featured_media":31267,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[214,1,95],"tags":[352,1549,1269,356,1276,104,1548,669],"class_list":["post-51911","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-farhad-hafezi","category-general-news","category-scientific-article","tag-corneal-cross-linking","tag-corneal-melting","tag-high-fluence-cxl","tag-infectious-keratitis","tag-microbial-keratitis","tag-pack-cxl","tag-riboflavin-cxl","tag-rose-bengal"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MD Roundtable - The Role of Cross-Linking in Infectious Keratitis - The ELZA Institute<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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