{"id":16145,"date":"2018-08-31T12:45:17","date_gmt":"2018-08-31T12:45:17","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=13460"},"modified":"2023-02-01T16:09:40","modified_gmt":"2023-02-01T16:09:40","slug":"fixing-your-smile-how-do-you-reoperate-and-what-are-the-consequences-for-corneal-strength","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/fixing-your-smile-how-do-you-reoperate-and-what-are-the-consequences-for-corneal-strength\/","title":{"rendered":"Fixar o seu SMILE: como se reopera e quais s\u00e3o as consequ\u00eancias para a resist\u00eancia da c\u00f3rnea?"},"content":{"rendered":"<p class=\"p3\"><span class=\"s1\">Outros profissionais de sa\u00fade visual encaminham regularmente pacientes para a ELZA que t\u00eam \"c\u00f3rneas desafiantes\"; muitos s\u00e3o aqueles cuja cirurgia refractiva a laser original n\u00e3o correu como planeado e precisam de um novo tratamento para corrigir a sua vis\u00e3o. Para os pacientes que j\u00e1 fizeram PRK, normalmente \u00e9 necess\u00e1rio efetuar medi\u00e7\u00f5es extensas da forma e da resist\u00eancia da c\u00f3rnea, planear cuidadosamente uma segunda abla\u00e7\u00e3o a laser e depois realiz\u00e1-la. No caso do LASIK, este retratamento (ou \"retoque\") envolve o levantamento do retalho LASIK original e a realiza\u00e7\u00e3o de uma abla\u00e7\u00e3o adicional. (Na ELZA, somos especialistas nisto - ajud\u00e1mos a desenvolver algoritmos de abla\u00e7\u00e3o para estes procedimentos a laser). Mas e o SMILE?<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">O SMILE - ou SMall Incision Lenticule Extraction - \u00e9 um procedimento refrativo a laser que utiliza um laser de femtosegundo para efetuar tr\u00eas cortes: dois na camada da c\u00f3rnea denominada estroma, que isolam uma \"lent\u00edcula refractiva\" (que, quando removida, d\u00e1 origem a uma c\u00f3rnea \"corrigida\"), e uma incis\u00e3o lateral que vai da superf\u00edcie da c\u00f3rnea at\u00e9 \u00e0 \"tampa\" do SMILE - a parte superior das duas primeiras incis\u00f5es no estroma. Isto permite ao cirurgi\u00e3o inserir um pequeno instrumento semelhante a uma esp\u00e1tula e utiliz\u00e1-lo para separar a lent\u00edcula do resto da c\u00f3rnea (o laser n\u00e3o a separa totalmente) e remov\u00ea-la atrav\u00e9s do terceiro orif\u00edcio.<\/span><\/p>\n<p>Os resultados visuais do SMILE n\u00e3o conseguem igualar o melhor que o LASIK e o PRK podem oferecer, mas, pelo menos em teoria, o SMILE pode deixar uma c\u00f3rnea biomecanicamente mais forte do que o LASIK, mas mais fraca do que o PRK. Porqu\u00ea? Para al\u00e9m da terceira incis\u00e3o para separa\u00e7\u00e3o e remo\u00e7\u00e3o da lent\u00edcula refractiva, n\u00e3o corta a camada de Bowman, que \u00e9 uma parte estruturalmente forte da c\u00f3rnea. Desde a introdu\u00e7\u00e3o do SMILE, t\u00eam surgido v\u00e1rias quest\u00f5es sobre a forma de efetuar um retratamento, caso tenham sido cometidos erros no primeiro procedimento. Existem algumas abordagens:<\/p>\n<p class=\"p3\"><span class=\"s1\"><b>1. Re-SMILE<\/b><\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Corte uma segunda camada a partir da parte inferior do corte SMILE original. O desafio com esta abordagem \u00e9 encontrar a borda da nova lent\u00edcula e colocar a esp\u00e1tula por baixo dela para a destacar e remover - especialmente se for uma corre\u00e7\u00e3o pequena e uma lent\u00edcula fina. <\/span><\/p>\n<p class=\"p3\"><span class=\"s1\"><b>2. Abla\u00e7\u00e3o por excimer laser (PRK) acima da tampa SMILE<\/b><\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Em teoria, isto tem algumas desvantagens,<span class=\"Apple-converted-space\">\u00a0 <\/span>A t\u00e9cnica de Trans-PRK, que n\u00e3o \u00e9 recomendada, perturba a membrana de Bowman, acarreta o risco de dor p\u00f3s-operat\u00f3ria adicional e requer a aplica\u00e7\u00e3o de mitomicina C \u00e0 superf\u00edcie da c\u00f3rnea para evitar a forma\u00e7\u00e3o de nevoeiro. No entanto, os col\u00edrios anest\u00e9sicos modernos tornam os procedimentos Trans-PRK modernos praticamente indolores, pelo que esta \u00e9 potencialmente uma boa op\u00e7\u00e3o. <\/span><\/p>\n<p class=\"p3\"><span class=\"s1\"><b>3. Transformar a tampa SMILE num retalho LASIK e efetuar outra abla\u00e7\u00e3o - a abla\u00e7\u00e3o \"Cap to flap\".<\/b><\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Isto envolve o alargamento da incis\u00e3o lateral (para acesso ao instrumento cir\u00fargico e extra\u00e7\u00e3o da lent\u00edcula) e a utiliza\u00e7\u00e3o de um excimer laser para ablacionar mais da camada de Bowman. Al\u00e9m disso, como a SMILE \u00e9 normalmente realizada mais profundamente na c\u00f3rnea do que o LASIK, esta interven\u00e7\u00e3o dever\u00e1 resultar numa maior redu\u00e7\u00e3o da resist\u00eancia biomec\u00e2nica da c\u00f3rnea ao stress do que o LASIK e num aumento do risco de ectasia iatrog\u00e9nica (induzida pelo m\u00e9dico) (enfraquecimento da c\u00f3rnea que leva a altera\u00e7\u00f5es da forma da c\u00f3rnea).<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">O outro fator a considerar aqui \u00e9 a estabilidade a longo prazo. Se a ectasia ocorrer (e as altera\u00e7\u00f5es na forma da c\u00f3rnea que provoca), existe um problema maior do que o facto de os doentes terem de voltar a usar \u00f3culos: a ectasia representa uma doen\u00e7a da c\u00f3rnea potencialmente cegante.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">\u00c9 aqui que entra o reticulado da c\u00f3rnea (CXL). O CXL envolve a aplica\u00e7\u00e3o de riboflavina (vitamina B2) na c\u00f3rnea sob ilumina\u00e7\u00e3o UV. Isto provoca uma rea\u00e7\u00e3o fotoqu\u00edmica que liga o colag\u00e9nio do estroma, fortalecendo-o assim. O CXL foi utilizado no passado para prevenir a ectasia induzida pelo LASIK (\"LASIK Xtra\"), mas ainda n\u00e3o se sabe at\u00e9 que ponto pode compensar o enfraquecimento da c\u00f3rnea.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Neste contexto, a Dr.\u00aa Sabine Kling e o Prof. Dr. Farhad Hafezi do Instituto ELZA juntaram-se ao pioneiro do SMILE, o Prof. Dr. Walter Sekundo e ao seu colega Dr. Bogdan Spiru da Universidade Philipps de Marburg em Marburg, Alemanha, para compreenderem qual a quantidade de enfraquecimento da c\u00f3rnea induzida por estas diferentes op\u00e7\u00f5es de re-tratamento SMILE (1)\u00a0<\/span><span class=\"s1\">- e investigar o potencial que o CXL tem para ajudar a restaurar a resist\u00eancia original da c\u00f3rnea ao stress.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Para o fazer, utilizaram olhos de porco - 96 deles. A corre\u00e7\u00e3o refractiva inicial do SMILE foi de -11 dioptrias (D), com um aumento (segundo procedimento) de -3 D, para uma corre\u00e7\u00e3o total de 14 D. Isto pode parecer muito, mas os olhos dos porcos t\u00eam c\u00f3rneas mais espessas do que os olhos humanos, pelo que 14 D nos porcos \u00e9 aproximadamente o equivalente a 10 D nos humanos. Foram criados seis grupos experimentais:<\/span><\/p>\n<ul class=\"ul1\">\n<li class=\"li3\"><span class=\"s1\">C\u00f3rneas de controlo (sem interven\u00e7\u00e3o refractiva)<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">C\u00f3rneas de controlo + CXL (9 mW\/cm\u00b2, 10 minutos)<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">SMILE -11 D + PRK -3 D<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">SMILE -14 D*<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">FLEX -14 D* (tampa e aba)<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">FLEX -14D* + CXL.<\/span><\/li>\n<\/ul>\n<p class=\"p3\"><span class=\"s1\">*Uma vez que os investigadores estavam interessados apenas no impacto biomec\u00e2nico da cirurgia e n\u00e3o nos pormenores da cirurgia, fabricaram lent\u00edculas SMILE de -14 D num \u00fanico passo, em vez de dois para os grupos SMILE e FLEX.<br \/>\n<\/span><\/p>\n<p><img decoding=\"async\" class=\"size-medium wp-image-13469 aligncenter\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2020\/10\/extensiometry-300x150-1.png\" alt=\"Ver o equipamento utilizado para testar a resist\u00eancia da c\u00f3rnea - die runden Gewebeproben der Hornhaut auf ihr Elastizit\u00e4t getestet werden.\" width=\"300\" height=\"150\" \/><\/p>\n<h6 class=\"p3\" style=\"text-align: center;\">O equipamento utilizado para avaliar a resist\u00eancia biomec\u00e2nica dos bot\u00f5es da c\u00f3rnea.<\/h6>\n<p class=\"p3\">Ap\u00f3s a realiza\u00e7\u00e3o dos procedimentos de refra\u00e7\u00e3o e de reticula\u00e7\u00e3o, foram removidas sec\u00e7\u00f5es circulares da c\u00f3rnea denominadas \"bot\u00f5es\" da c\u00f3rnea (que continham a regi\u00e3o de abla\u00e7\u00e3o por laser e de reticula\u00e7\u00e3o no centro), as quais foram submetidas a algumas medi\u00e7\u00f5es de estiramento e deforma\u00e7\u00e3o para avaliar o m\u00f3dulo de elasticidade da c\u00f3rnea - essencialmente, a capacidade da c\u00f3rnea para resistir ao stress biomec\u00e2nico ap\u00f3s a cirurgia. O que \u00e9 que os investigadores descobriram?<\/p>\n<p class=\"p3\"><span class=\"s1\">Em compara\u00e7\u00e3o com as c\u00f3rneas de controlo (sem abla\u00e7\u00e3o por laser, sem CXL):<\/span><\/p>\n<ul class=\"ul1\">\n<li class=\"li3\"><span class=\"s1\">Os melhoramentos Re-SMILE e PRK tiveram pouco efeito no m\u00f3dulo de elasticidade<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">O aumento do LASIK - cap e flap - produziu a c\u00f3rnea mais fraca<\/span><\/li>\n<li class=\"li3\"><span class=\"s1\">O tratamento CXL aumentou significativamente o m\u00f3dulo de elasticidade<\/span><\/li>\n<\/ul>\n<p class=\"p7\"><span class=\"s1\">Em geral, a cirurgia refractiva diminuiu o m\u00f3dulo de elasticidade global em 7%, enquanto o CXL o aumentou em 20%. Os autores escreveram: \"As nossas experi\u00eancias sugerem que, de um ponto de vista biomec\u00e2nico, o aumento do LASIK n\u00e3o \u00e9 recomendado ap\u00f3s o SMILE.\" <\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">Ent\u00e3o, o que \u00e9 que aprendemos? Quando se trata de retratamentos para pacientes que foram submetidos a SMILE, Re-SMILE e PRK, os melhoramentos afectam menos a integridade biomec\u00e2nica da c\u00f3rnea do que o LASIK - mas a extens\u00e3o do enfraquecimento da c\u00f3rnea gra\u00e7as \u00e0 cirurgia refractiva a laser \u00e9 pequena, em rela\u00e7\u00e3o ao efeito de endurecimento do CXL. No entanto, os autores fizeram uma observa\u00e7\u00e3o de cautela: O CXL achata a c\u00f3rnea em cerca de 1 D - e de uma forma bastante imprevis\u00edvel tamb\u00e9m. Este primeiro estudo do g\u00e9nero respondeu apenas a quest\u00f5es b\u00e1sicas sobre a for\u00e7a biomec\u00e2nica da c\u00f3rnea antes e depois da cirurgia refractiva e do CXL - a compreens\u00e3o dos aspectos refractivos e cir\u00fargicos pr\u00e1ticos destas t\u00e9cnicas exigir\u00e1 mais investiga\u00e7\u00e3o.<\/span><\/p>\n<p class=\"p3\"><span class=\"s1\"><b>Os investigadores utilizaram porcos vivos nas suas experi\u00eancias?<\/b><\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">N\u00e3o. Todos os olhos de porco utilizados neste estudo foram obtidos em matadouros locais.<\/span><\/p>\n<figure id=\"attachment_13463\" aria-describedby=\"caption-attachment-13463\" style=\"width: 220px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2020\/10\/Kling-2017-Biomechanical-Weakening-of-Differen-1.pdf\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-13463 size-medium\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2020\/10\/Kling-2017-SMILE-cover-220x300-1.png\" alt=\"Kling et al Enfraquecimento biomec\u00e2nico de diferentes op\u00e7\u00f5es de re-tratamento ap\u00f3s SMILE PDF\" width=\"220\" height=\"300\" \/><\/a><figcaption id=\"caption-attachment-13463\" class=\"wp-caption-text\"><a href=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2018\/08\/Kling-2017-Biomechanical-Weakening-of-Differen.pdf\">Clique na miniatura para ler o PDF.<\/a><\/figcaption><\/figure>\n<p class=\"p3\"><span class=\"s1\"><b>Refer\u00eancia<\/b><\/span><\/p>\n<p class=\"p3\"><span class=\"s1\">1. Kling S, Spiru B, Hafezi F, Sekundo W. Enfraquecimento biomec\u00e2nico de diferentes op\u00e7\u00f5es de retratamento ap\u00f3s extra\u00e7\u00e3o de lent\u00edculas por incis\u00e3o pequena (SMILE). J Refract Surg. 2017;33(3):193-8. PMID:\u00a0<a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pubmed\/28264134\">28264134<\/a>.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p class=\"p3\">","protected":false},"excerpt":{"rendered":"<p>Outros profissionais de sa\u00fade visual encaminham regularmente pacientes para a ELZA que t\u00eam \"c\u00f3rneas dif\u00edceis\"; muitos s\u00e3o aqueles cuja cirurgia refractiva a laser original n\u00e3o correu muito bem e precisam de um novo tratamento para corrigir a sua vis\u00e3o<\/p>","protected":false},"author":4,"featured_media":16846,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[214,215,95],"tags":[132,275,599,112,129,242,338],"class_list":["post-16145","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-farhad-hafezi","category-sabine-kling","category-scientific-article","tag-biomechanics","tag-corneal-biomechanics","tag-laser-complications","tag-lasik","tag-prk","tag-smile","tag-transprk-is-best"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>When SMILE laser surgery goes wrong, what&#039;s the best way of fixing it?<\/title>\n<meta name=\"description\" content=\"When SMILE laser surgery goes wrong, what&#039;s the best way to fix it that doesn&#039;t weaken the cornea? 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