{"id":34554,"date":"2021-03-03T08:13:56","date_gmt":"2021-03-03T08:13:56","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=34554"},"modified":"2021-03-08T12:34:34","modified_gmt":"2021-03-08T12:34:34","slug":"cxl-in-thin-corneas-with-the-sub400-protocol-paper-published","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/cxl-in-thin-corneas-with-the-sub400-protocol-paper-published\/","title":{"rendered":"CXL em c\u00f3rneas finas com o protocolo sub400: artigo agora publicado"},"content":{"rendered":"<p>N\u00f3s, no Instituto ELZA, temos o orgulho de informar que o nosso artigo de refer\u00eancia que descreve como o protocolo sub400 \u00e9 utilizado para efetuar CXL em c\u00f3rneas finas com ceratocone foi agora publicado na <em>Jornal Americano de Oftalmologia <\/em>(1).<\/p>\n<p>Para compreender o avan\u00e7o que representa a abordagem do reticulado corneano individualizado (CXL) sub400, vale a pena rever a raz\u00e3o pela qual o CXL n\u00e3o pode ser efectuado em c\u00f3rneas muito finas (como as que apresentam ceratocone avan\u00e7ado e uma espessura corneana inferior a 400 \u00b5m) que provavelmente necessitar\u00e3o de cirurgia de transplante de c\u00f3rnea) e as t\u00e9cnicas (ou \"hacks\") que os cirurgi\u00f5es utilizavam para permitir a realiza\u00e7\u00e3o do reticulado nestas c\u00f3rneas.<\/p>\n<h4>Cross-linking tradicional de c\u00f3rneas finas<\/h4>\n<p>O CXL envolve a irradia\u00e7\u00e3o da c\u00f3rnea com luz ultravioleta (UV) (2). Antes disso, o estroma da c\u00f3rnea \u00e9 saturado com riboflavina. A riboflavina absorve a luz UV, o que provoca reac\u00e7\u00f5es oxidativas que unem covalentemente as mol\u00e9culas do estroma, fortalecendo-o e tornando a c\u00f3rnea mais resistente a novos enfraquecimentos. A riboflavina \u00e9 consumida durante o processo, de cima para baixo. Na base da c\u00f3rnea, no entanto, existe uma camada de c\u00e9lulas que s\u00e3o importantes para manter a c\u00f3rnea clara e saud\u00e1vel: as c\u00e9lulas endoteliais da c\u00f3rnea. Estas c\u00e9lulas podem ser danificadas quando a irradia\u00e7\u00e3o UV excede um determinado n\u00edvel. Para evitar que isso aconte\u00e7a, e deixando uma boa margem de seguran\u00e7a, os protocolos tradicionais de CXL (2) evitam a reticula\u00e7\u00e3o dos 70 \u00b5m inferiores do estroma quando se administra a dose total padr\u00e3o de UV de 5,4 J\/cm\u00b2, fornecida por 30 minutos de irradia\u00e7\u00e3o UV a uma intensidade de 3 mW\/cm\u00b2.<\/p>\n<p>Os cirurgi\u00f5es adoptaram duas abordagens principais para contornar o limite de espessura m\u00ednima de 400 \u00b5m. A primeira consistiu em inchar a c\u00f3rnea com riboflavina hipoosmolar at\u00e9 atingir uma espessura superior a 400 \u00b5m (3). A outra abordagem tentada \u00e9 engrossar artificialmente a c\u00f3rnea com uma lente de contacto embebida em riboflavina (4). No entanto, ambas as abordagens s\u00e3o menos do que ideais. A primeira abordagem pode resultar em efeitos imprevis\u00edveis de incha\u00e7o e variabilidade no efeito de reticula\u00e7\u00e3o; a segunda abordagem impede a entrada de um componente essencial da rea\u00e7\u00e3o fotoqu\u00edmica de reticula\u00e7\u00e3o no estroma: o oxig\u00e9nio, o que resulta num efeito de reticula\u00e7\u00e3o mais fraco em termos do refor\u00e7o da c\u00f3rnea produzido.<\/p>\n<p>&nbsp;<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-34558 size-large\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-1024x740.jpg\" alt=\"CXL em c\u00f3rneas finas: protocolos tradicionais\" width=\"800\" height=\"578\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-1024x740.jpg 1024w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-300x217.jpg 300w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-768x555.jpg 768w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-1536x1110.jpg 1536w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-2048x1480.jpg 2048w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Traditional-methods-sub400-16x12.jpg 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h4>N\u00e3o manipular a c\u00f3rnea; manipular a luz<\/h4>\n<p>Mas em vez de tentar manipular a espessura da c\u00f3rnea para manter uma margem de seguran\u00e7a de 70 \u00b5m acima da camada de c\u00e9lulas endoteliais da c\u00f3rnea, porque n\u00e3o moderar a quantidade de energia fornecida \u00e0 c\u00f3rnea, com base na espessura da c\u00f3rnea de cada doente, para obter o mesmo efeito? Para o fazer, \u00e9 t\u00e3o simples como ajustar o tempo de irradia\u00e7\u00e3o. Foi desenvolvido um algoritmo de tratamento que segue exatamente esta abordagem: adaptar o tempo de irradia\u00e7\u00e3o \u00e0 espessura individual da c\u00f3rnea de cada doente (5), e que foi agora validado na cl\u00ednica: o protocolo sub400 (1).<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-34557 size-large\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-1024x361.jpg\" alt=\"CXL em c\u00f3rneas finas: o protocolo sub400\" width=\"800\" height=\"282\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-1024x361.jpg 1024w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-300x106.jpg 300w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-768x271.jpg 768w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-1536x541.jpg 1536w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-2048x722.jpg 2048w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Individualized-method-sub400-16x6.jpg 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h4>A abordagem sub400<\/h4>\n<p>A abordagem sub400 tem v\u00e1rias vantagens em rela\u00e7\u00e3o \u00e0s abordagens anteriores: elimina a variabilidade introduzida pelo CXL hipoosmolar e permite que o oxig\u00e9nio se difunda na c\u00f3rnea sem obst\u00e1culos (ao contr\u00e1rio do CXL assistido por lentes de contacto). Al\u00e9m disso, estas abordagens antigas s\u00f3 eram vi\u00e1veis em c\u00f3rneas com pelo menos ~330 \u00b5m. A abordagem sub400 tem sido utilizada para tratar com sucesso c\u00f3rneas t\u00e3o finas como ~200 \u00b5m e ainda manter a margem de seguran\u00e7a de 70 \u00b5m acima do endot\u00e9lio da c\u00f3rnea.<\/p>\n<p>Clique na imagem de pr\u00e9-visualiza\u00e7\u00e3o do artigo para ler o manuscrito:<\/p>\n<p><a href=\"https:\/\/lightforsight.org\/wp-content\/uploads\/2020\/12\/sub400-CXL-in-ultra-thin-corneas-PrePrint.pdf\"><img decoding=\"async\" class=\"aligncenter wp-image-34559 size-medium\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Paper-cover-image-237x300.png\" alt=\"\" width=\"237\" height=\"300\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Paper-cover-image-237x300.png 237w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Paper-cover-image-9x12.png 9w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Paper-cover-image.png 552w\" sizes=\"(max-width: 237px) 100vw, 237px\" \/><\/a>O Prof. Hafezi, Diretor M\u00e9dico do Instituto ELZA, gravou um pequeno v\u00eddeo explicativo do protocolo sub400:<\/p>\n<p><iframe title=\"Avan\u00e7o do CXL - as c\u00f3rneas finas com ceratocone podem ser tratadas com &quot;sub400&quot;\" src=\"https:\/\/player.vimeo.com\/video\/385497754?dnt=1&amp;app_id=122963\" width=\"800\" height=\"450\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<h4><strong>Refer\u00eancias<\/strong><\/h4>\n<ol>\n<li>Hafezi F, Kling S, Gilardoni F et al. Cross-linking corneano individualizado com riboflavina e UV-A em c\u00f3rneas ultra-finas: o protocolo sub400. Am J Ophthalmol. 2021; 224:133-142.<\/li>\n<li>Wollensak G, et al. Riboflavina\/ultravioleta-A induzida por reticula\u00e7\u00e3o de colag\u00e9nio para o tratamento do ceratocone. Am J Ophthalmol 2003; 135:620-627.<\/li>\n<li>Hafezi F, et al. Reticula\u00e7\u00e3o do colag\u00e9nio com ultravioleta-A e solu\u00e7\u00e3o hipoosmolar de riboflavina em c\u00f3rneas finas. J Cataract Refract Surg 2009; 35:621-624.<\/li>\n<li>Jacob S, et al. Reticula\u00e7\u00e3o de colag\u00e9nio assistida por lentes de contacto (CACXL): Uma nova t\u00e9cnica para a liga\u00e7\u00e3o cruzada de c\u00f3rneas finas. J Refract Surg 2014; 30:366-72.<\/li>\n<li>Kling S, Richoz O, Hammer A, et al. Aumento da efic\u00e1cia biomec\u00e2nica do cross-linking corneano em c\u00f3rneas finas devido a uma maior disponibilidade de oxig\u00e9nio. J Refract Surg. 2015;31(12):840-846.<\/li>\n<\/ol>\n<h4>Rea\u00e7\u00e3o nas redes sociais<\/h4>\n<p><a href=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-34556 size-large\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-1024x284.png\" alt=\"\" width=\"800\" height=\"222\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-1024x284.png 1024w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-300x83.png 300w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-768x213.png 768w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-1536x426.png 1536w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-2048x568.png 2048w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2021\/03\/Facebook-sub400-16x4.png 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>We at the ELZA Institute are proud to report that our landmark paper that describes how the sub400 protocol is used to perform CXL in thin corneas with keratoconus is now published in the American Journal of Ophthalmology (1). To understand how much of an advance that the sub400 individualised corneal cross-linking (CXL) approach is, [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":34570,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[243,214,223,95,467],"tags":[130,100,133,123,353,423,122],"class_list":["post-34554","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-emilio-torres","category-farhad-hafezi","category-nikki-hafezi","category-scientific-article","category-top-10","tag-cross-linking","tag-cxl","tag-epi-off","tag-keratoconus","tag-sub400","tag-thin-cornea","tag-translational-research"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CXL in thin corneas with the sub400 protocol: paper now published<\/title>\n<meta name=\"description\" content=\"CXL in thin corneas: the &quot;sub400 protocol&quot;, has now been published in the American Journal of Ophthalmology. 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