{"id":51564,"date":"2025-12-19T12:15:23","date_gmt":"2025-12-19T12:15:23","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=51564"},"modified":"2025-12-19T12:55:28","modified_gmt":"2025-12-19T12:55:28","slug":"epi-on-cxl-understanding-early-failures-and-modern-clinical-solutions","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/epi-on-cxl-understanding-early-failures-and-modern-clinical-solutions\/","title":{"rendered":"Epi-On CXL - Compreender as falhas iniciais e as solu\u00e7\u00f5es cl\u00ednicas modernas"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"51564\" class=\"elementor elementor-51564\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e155096 e-flex e-con-boxed e-con e-parent\" data-id=\"1e155096\" 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-5bc0727 elementor-widget elementor-widget-text-editor\" data-id=\"5bc0727\" 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>No <a href=\"http:\/\/cxlexpertsmeeing.com\">Reuni\u00e3o de peritos KCXL<\/a> 2025, realizada em Mil\u00e3o a 12 de dezembro de 2025, o cirurgi\u00e3o de cataratas, refra\u00e7\u00e3o e c\u00f3rnea da ELZA <a href=\"https:\/\/www.elza-institute.com\/pt\/sobre\/emilio-torres\/\">Dr. Emilio Torres-Netto, MD, PhD, FEBO, FWCRS<\/a>, O Dr. K. K., da Universidade de Lisboa, apresentou uma an\u00e1lise pormenorizada da evolu\u00e7\u00e3o do CXL epi-on, centrando-se nas raz\u00f5es pelas quais os primeiros protocolos falharam e na forma como as abordagens contempor\u00e2neas resolveram estas limita\u00e7\u00f5es atrav\u00e9s da otimiza\u00e7\u00e3o fisiol\u00f3gica.<\/p>\n\n\n\n<p>O Dr. Torres-Netto come\u00e7ou por revisitar o papel hist\u00f3rico do CXL epi-off, que continua a ser um m\u00e9todo altamente eficaz para estabilizar o ceratocone progressivo. No entanto, a remo\u00e7\u00e3o do epit\u00e9lio est\u00e1 associada a inconvenientes bem conhecidos, incluindo a dor p\u00f3s-operat\u00f3ria, a reepiteliza\u00e7\u00e3o tardia, a n\u00e9voa e - raramente - a fus\u00e3o est\u00e9ril ou a infe\u00e7\u00e3o. Estas limita\u00e7\u00f5es constitu\u00edram a justifica\u00e7\u00e3o original para o desenvolvimento de abordagens epi-on.<\/p>\n\n\n\n<p>No entanto, os primeiros protocolos de CXL epi-on produziram resultados cl\u00ednicos insatisfat\u00f3rios. A simples preserva\u00e7\u00e3o do epit\u00e9lio durante a aplica\u00e7\u00e3o dos par\u00e2metros convencionais de CXL resultou numa progress\u00e3o cont\u00ednua, com aumentos de Kmax e um maior afinamento da c\u00f3rnea, registados nos primeiros estudos. O Dr. Torres-Netto sublinhou que estes insucessos n\u00e3o eram surpreendentes, uma vez que o epit\u00e9lio intacto altera fundamentalmente o ambiente fotoqu\u00edmico necess\u00e1rio para um CXL eficaz.<\/p>\n\n\n\n<p>Com o epit\u00e9lio no local, a transmiss\u00e3o de UV \u00e9 atenuada, a penetra\u00e7\u00e3o da riboflavina \u00e9 reduzida e a disponibilidade de oxig\u00e9nio \u00e9 limitada, agravada pelo consumo de oxig\u00e9nio epitelial. As tentativas de abordar estas quest\u00f5es isoladamente - como a modifica\u00e7\u00e3o das formula\u00e7\u00f5es de riboflavina, o aumento da concentra\u00e7\u00e3o ou a adi\u00e7\u00e3o de potenciadores de penetra\u00e7\u00e3o - revelaram-se insuficientes. Em v\u00e1rios estudos, os defeitos epiteliais continuaram a ocorrer apesar do tratamento \u201cepi-on\u201d, e a estabiliza\u00e7\u00e3o biomec\u00e2nica permaneceu inadequada.<\/p>\n\n\n\n<p>Um tema central da apresenta\u00e7\u00e3o foi o facto de o CXL epi-on eficaz exigir a otimiza\u00e7\u00e3o simult\u00e2nea de todos os par\u00e2metros cr\u00edticos da rea\u00e7\u00e3o. O Dr. Torres-Netto analisou dados experimentais e cl\u00ednicos que demonstram que a abordagem de um \u00fanico fator limitador n\u00e3o reproduz o efeito biomec\u00e2nico do CXL epi-on. O trabalho de prova de conceito utilizando uma irradi\u00e2ncia muito baixa e uma exposi\u00e7\u00e3o prolongada demonstrou um endurecimento parcial, mas os resultados permaneceram inferiores quando o epit\u00e9lio era espesso.<\/p>\n\n\n\n<p>Os avan\u00e7os subsequentes marcaram um ponto de viragem. Os protocolos epi-on modernos combinam estrat\u00e9gias para aumentar a disponibilidade de riboflavina no estroma, compensar a atenua\u00e7\u00e3o epitelial dos raios UV e respeitar a depend\u00eancia do oxig\u00e9nio da rea\u00e7\u00e3o CXL. Os dados cl\u00ednicos apresentados demonstraram uma forma\u00e7\u00e3o consistente da linha de demarca\u00e7\u00e3o a aproximadamente 220 \u00b5m, com Kmax e espessura da c\u00f3rnea est\u00e1veis no seguimento de um ano.<\/p>\n\n\n\n<p>O Dr. Torres-Netto salientou que estas abordagens contempor\u00e2neas de CXL epi-on s\u00e3o particularmente relevantes para os doentes com progress\u00e3o documentada e boa acuidade visual de base, em que \u00e9 desej\u00e1vel minimizar a dor, o nevoeiro e as complica\u00e7\u00f5es epiteliais. Exemplos de casos a longo prazo mostraram uma estabiliza\u00e7\u00e3o sustentada ao longo de v\u00e1rios anos, incluindo em ceratocone avan\u00e7ado, embora com menos achatamento do que o tipicamente observado ap\u00f3s o CXL epi-off.<\/p>\n\n\n\n<p>Concluiu que os fracassos iniciais do CXL epi-on reflectiam uma compensa\u00e7\u00e3o fisiol\u00f3gica incompleta e n\u00e3o conceitos errados. Com os protocolos da gera\u00e7\u00e3o atual a abordarem todos os factores limitadores em conjunto, o CXL epi-on tornou-se uma op\u00e7\u00e3o clinicamente significativa em doentes cuidadosamente selecionados.<\/p>\n\n\n\n<p>A apresenta\u00e7\u00e3o completa da Reuni\u00e3o de Peritos KCXL 2025 pode ser vista abaixo.<\/p>\n\n\n\n<p><\/p>\n\t\t\t\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<div class=\"elementor-element elementor-element-ee71b51 e-flex e-con-boxed e-con e-parent\" data-id=\"ee71b51\" 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-7c9f88e elementor-widget elementor-widget-video\" data-id=\"7c9f88e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;video_type&quot;:&quot;vimeo&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<iframe class=\"elementor-video-iframe\" allowfullscreen allow=\"clipboard-write\" title=\"Reprodutor de v\u00eddeo de vimeo\" src=\"https:\/\/player.vimeo.com\/video\/1147716869?color&amp;autopause=0&amp;loop=0&amp;muted=0&amp;title=1&amp;portrait=1&amp;byline=1#t=\"><\/iframe>\t\t<\/div>\n\t\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<div class=\"elementor-element elementor-element-b66e18b e-flex e-con-boxed e-con e-parent\" data-id=\"b66e18b\" 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-ea3cbd0 elementor-widget elementor-widget-image\" data-id=\"ea3cbd0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"534\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-1024x683.jpg\" class=\"attachment-large size-large wp-image-51567\" alt=\"\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-1024x683.jpg 1024w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-300x200.jpg 300w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-768x512.jpg 768w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-1536x1024.jpg 1536w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-2048x1366.jpg 2048w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/12\/DSC06278-3-18x12.jpg 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Foto de grupo da Reuni\u00e3o de Peritos KCXL 2025<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\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>Emilio Torres-Netto analisou a evolu\u00e7\u00e3o do CXL epi-on no KCXL 2025, explicando os fracassos iniciais e como os protocolos modernos conseguem agora uma estabiliza\u00e7\u00e3o do ceratocone clinicamente significativa.<\/p>","protected":false},"author":4,"featured_media":51566,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[243,1,97],"tags":[352,1499,1497,1172,238,679,1019,637,1488,123,1498,1496,1493,1259,1262],"class_list":["post-51564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-emilio-torres","category-general-news","category-podium-power","tag-corneal-cross-linking","tag-corneal-physiology","tag-cxl-biomechanics","tag-cxl-protocols","tag-demarcation-line","tag-elza-institute","tag-emilio-torres-netto","tag-epi-on-cxl","tag-kcxl-2025","tag-keratoconus","tag-keratoconus-progression","tag-oxygen-dependent-cxl","tag-personalized-cxl","tag-riboflavin-penetration","tag-transepithelial-cxl"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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