{"id":4822,"date":"2020-10-27T09:00:52","date_gmt":"2020-10-27T09:00:52","guid":{"rendered":"https:\/\/endoscopiaterapeutica.net\/pt\/uncategorized\/teste-de-urease\/"},"modified":"2022-05-26T23:34:38","modified_gmt":"2022-05-26T23:34:38","slug":"teste-de-urease","status":"publish","type":"post","link":"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/teste-de-urease\/","title":{"rendered":"Teste de urease"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>O teste de urease ou teste r\u00e1pido de urease (RUT) \u00e9 um teste r\u00e1pido, barato e simples, muito usado no exame de endoscopia para verificar a presen\u00e7a da bact\u00e9ria Helicobacter pylori. Na verdade, o uteste detecta a presen\u00e7a da <strong>enzima urease<\/strong> na amostra da mucosa g\u00e1strica. Portanto, o teste da urease \u00e9 um <strong>teste indireto<\/strong> da presen\u00e7a de H. pylori (HP).<\/p>\n<p>Apesar de ser um teste simples, e o mais popular para fazer o diagn\u00f3stico da infec\u00e7\u00e3o pelo HP, n\u00e3o deixa de ser um <strong>teste invasivo<\/strong>, visto que requer exame de endoscopia para obten\u00e7\u00e3o de um fragmento da mucosa g\u00e1strica.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Mas o que \u00e9 e para que serve a enzima urease?<\/strong><\/h2>\n<ul>\n<li>A urease \u00e9 uma enzima encontrada no citoplasma de v\u00e1rios micro-organismos, como, por exemplo, o Helicobacter pylori.<\/li>\n<li>Essa enzima \u00e9 respons\u00e1vel pela degrada\u00e7\u00e3o da ureia em am\u00f4nia e CO2.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div id=\"attachment_11778\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2020\/10\/FCA71C75-9462-4329-A3D3-21AD5C32996E.jpeg\" data-rel=\"penci-gallery-image-content\" ><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-11778\" class=\"wp-image-11778\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/FCA71C75-9462-4329-A3D3-21AD5C32996E.jpeg\" alt=\"teste da urease\" width=\"540\" height=\"184\" \/><\/a><p id=\"caption-attachment-11778\" class=\"wp-caption-text\">Figura 1: urease converte ureia em amonia<\/p><\/div>\n<p>&nbsp;<\/p>\n<ul>\n<li>Como todos sabemos, o est\u00f4mago \u00e9 um ambiente bastante \u00e1cido e hostil para as bact\u00e9rias.<\/li>\n<li>Dentro do est\u00f4mago tamb\u00e9m existe o composto <strong>ureia<\/strong>.<\/li>\n<li>O HP produz urease, que hidroliza a ureia em am\u00f4nia (alcalina), elevando o pH do meio.<\/li>\n<li>Desta forma, o HP consegue sobreviver e penetrar na camada de \u00e1cido e muco do est\u00f4mago, utilizando sua atividade flagelada, at\u00e9 abrigar-se no fundo das gl\u00e2ndulas g\u00e1stricas.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div id=\"attachment_11780\" style=\"width: 680px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2020\/10\/EFA8B802-1C11-460E-B1BA-0D430C7A2542.jpeg\" data-rel=\"penci-gallery-image-content\" ><img decoding=\"async\" aria-describedby=\"caption-attachment-11780\" class=\"wp-image-11780 size-large\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/EFA8B802-1C11-460E-B1BA-0D430C7A2542.jpeg\" alt=\"teste da urease\" width=\"670\" height=\"263\" \/><\/a><p id=\"caption-attachment-11780\" class=\"wp-caption-text\">Figura 2: urease produzida pelo H pylori provoca hidrolise da ureia em am\u00f4nia e CO2, alcalinizando a camada de \u00e1cido do est\u00f4mago e permitindo que o HP sobreviva e atinja o epit\u00e9lio da mucosa g\u00e1strica<\/p><\/div>\n<p>&nbsp;<\/p>\n<h2><strong>Como funciona o teste?<\/strong><\/h2>\n<p>O fragmento de mucosa g\u00e1strica \u00e9 colocado em um tubo ou gel contendo ureia e um indicador de pH (vermelho de fenol). O pH desta solu\u00e7\u00e3o \u00e9 de 5,9.<\/p>\n<p>Se a urease produzida pelo <em>Helicobacter pylori<\/em> estiver presente no fragmento, ocorrer\u00e1 hidr\u00f3lise da ureia formando am\u00f4nia. A am\u00f4nia alcaliniza o meio, promovendo a mudan\u00e7a de cor do amarelo para o rosa.<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_11781\" style=\"width: 680px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-11781\" class=\"wp-image-11781 size-large\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/35E374BA-5B4E-481E-8128-F57ED81A88A4.jpeg\" alt=\"teste da urease\" width=\"670\" height=\"250\" \/><p id=\"caption-attachment-11781\" class=\"wp-caption-text\">Figura 3: esquema sumarizando como funciona o teste de urease<\/p><\/div>\n<p>&nbsp;<\/p>\n<div id=\"attachment_11782\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2020\/10\/302D5159-9B2C-4907-B2C0-1039C3918E4D.jpeg\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11782\" class=\"wp-image-11782 size-medium\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/302D5159-9B2C-4907-B2C0-1039C3918E4D.jpeg\" alt=\"teste da urease\" width=\"300\" height=\"206\" \/><\/a><p id=\"caption-attachment-11782\" class=\"wp-caption-text\">Figura 4: teste de urease negativo (esquerda) e positivo (direita)<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>Obs.: outros testes usaram indicadores diferentes, cada um com uma vantagem potencial. Como exemplo, alguns testes iniciam a rea\u00e7\u00e3o com um pH mais baixo (pH 5,4), visto que a atividade da urease do <em>H. pylori<\/em> \u00e9 mais eficiente nesse pH mais baixo em compara\u00e7\u00e3o com outras bact\u00e9rias, o que poderia diminuir o falso positivo (que, no entanto, \u00e9 bem raro).<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_11783\" style=\"width: 227px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2020\/10\/B4C262C7-6B8D-4F66-8347-52A84093FEC3.jpeg\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11783\" class=\"wp-image-11783 size-medium\" src=\"https:\/\/endoscopiaterapeutica.net\/pt\/wp-content\/uploads\/2021\/08\/B4C262C7-6B8D-4F66-8347-52A84093FEC3.jpeg\" alt=\"teste da urease\" width=\"217\" height=\"300\" \/><\/a><p id=\"caption-attachment-11783\" class=\"wp-caption-text\">Figura 5: O teste hpfast inicia a rea\u00e7\u00e3o em um pH mais baixo, diminuindo o falso positivo da urease produzia por outras bact\u00e9rias como Proteus ou Pseudomonas.<\/p><\/div>\n<p>&nbsp;<\/p>\n<h2><strong>Velocidade da rea\u00e7\u00e3o<\/strong><\/h2>\n<p>O tempo em que o teste fica positivo depende da concentra\u00e7\u00e3o de bact\u00e9rias e da temperatura.<\/p>\n<ul>\n<li>Um estudo comparou bi\u00f3psias de antro colocadas em um aquecedor a 38 \u2103 ou mantidas \u00e0 temperatura ambiente (~ 21 \u2103).<\/li>\n<li>A capacidade de fazer um diagn\u00f3stico em 30 minutos foi 20% maior usando o mais quente, mas, no geral, os resultados foram os mesmos (Yousfi MM, 1996).<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>A maioria dos testes ficar\u00e1 positivo dentro de 2-3 horas, mas recomenda-se guardar os testes negativos por 24 horas para a tomada de decis\u00e3o.<\/p>\n<p>Resultados positivos ap\u00f3s 24 horas s\u00e3o, na maioria das vezes, falsos positivos e n\u00e3o deveriam ser usados para decis\u00f5es de tratamento.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Efic\u00e1cia do teste de urease<\/strong><\/h2>\n<p>A sensibilidade do teste de urease varia entre 80% e 100% e especificidade entre 97% e 99%.<\/p>\n<p>Estima-se que seja necess\u00e1rio aproximadamente 10<sup>5<\/sup> <em>H. pylori <\/em>na amostra de bi\u00f3psia para alterar a cor do teste, o que geralmente n\u00e3o \u00e9 um problema, pois a concentra\u00e7\u00e3o de <em>H. pylori<\/em> normalmente excede esse m\u00ednimo.<\/p>\n<p>&nbsp;<\/p>\n<p>Importante ressaltar que a bi\u00f3psia deve ser coletada de um local onde os organismos est\u00e3o presentes:<\/p>\n<ul>\n<li>Em um paciente sem atrofia g\u00e1strica, geralmente uma bi\u00f3psia do antro \u00e9 suficiente (geralmente com sensibilidade &gt; 85% e frequentemente entre 95-100%).<\/li>\n<li>No entanto, se o paciente possui gastrite atr\u00f3fica ou extensas \u00e1reas de metaplasia intestinal, o teste pode resultar em um falso negativo. Nesse caso, acrescentar um fragmento do corpo pode aumentar a sensibilidade.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Um estudo comparou os resultados de uma bi\u00f3psia realizada na incisura angularis, uma na regi\u00e3o pr\u00e9-pil\u00f3rica e uma no corpo, apresentando sensibilidade de 100%, 87% e 84,4%, respectivamente, e nenhum falso positivo, ou seja, especificidade de 100% (Woo, 1996).<\/p>\n<p>&nbsp;<\/p>\n<div class=\"pcrstb-wrap\"><table>\n<tbody>\n<tr>\n<td width=\"566\"><strong>No geral, para melhores resultados, recomenda-se a obten\u00e7\u00e3o de dois fragmentos:<\/strong><\/p>\n<p>\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0 um do antro (evitando \u00e1reas de ulcera\u00e7\u00e3o e metaplasia intestinal \u00f3bvia)<\/p>\n<p>\u00b7\u00a0\u00a0\u00a0\u00a0\u00a0 um do corpo<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>&nbsp;<\/p>\n<h2><strong>Fatores que podem diminuir a sensibilidade do teste de urease (falsos negativos):<\/strong><\/h2>\n<p>Al\u00e9m da atrofia g\u00e1strica, a sensibilidade do teste tamb\u00e9m pode diminuir em:<\/p>\n<ul>\n<li>pacientes com \u00falceras p\u00e9pticas hemorr\u00e1gicas (67% -85%) (Tu, 1999)<\/li>\n<li>pacientes com gastrectomia parcial (sens = 79%)<\/li>\n<li>Paciente em uso de IBP<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Alguns autores advogam que a contamina\u00e7\u00e3o da pin\u00e7a de bi\u00f3psia por formalina poderia diminuir a sensibilidade do teste. No entanto, um estudo comparou os resultados de 253 pacientes submetidos a duas coletas de teste: uma antes e uma ap\u00f3s a imers\u00e3o da pin\u00e7a em formalina. No total, houve discord\u00e2ncia em apenas 8 casos (3%) e os autores concluem que a pr\u00e9-imers\u00e3o da pin\u00e7a em formalina n\u00e3o interfere com a sensibilidade do teste (Castelotte J, 2001).<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Falso positivo<\/strong><\/h2>\n<p>Falsos positivos s\u00e3o raros e, quando presentes, podem ser devido \u00e0 presen\u00e7a de outros organismos contendo urease, como Proteus mirabilis, Citrobactor freundii, Klebsiella pneumonia, Enterobactor cloacae e Staphylococcus aureus.<\/p>\n<p>Contudo, a menos que o paciente tenha acloridria ou hipocloridria, a presen\u00e7a desses organismos em concentra\u00e7\u00e3o suficiente para produzir um resultado positivo \u00e9 pouco prov\u00e1vel.<\/p>\n<p>Ap\u00f3s 24 horas, aumenta-se a chance de falso positivo pela presen\u00e7a de outros organismos contendo urease.<\/p>\n<p>&nbsp;<\/p>\n<blockquote><p><strong>Obs:<\/strong> UREIA \u00e9 uma parox\u00edtona com ditongo aberto e, portanto, n\u00e3o \u00e9 acentuada.Para saber mais sobre a nova ortografia aplicada aos termos endosc\u00f3picos, confira<strong><a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/nova-ortografia-aplicada-a-endoscopia\/\">clicando aqui !<\/a><\/strong><\/p><\/blockquote>\n<p>&nbsp;<\/p>\n<h6><strong>Como citar este artigo:<\/strong><\/h6>\n<p><em>Martins B. Teste de urease. Endoscopia Terap\u00eautica; 2020. Dispon\u00edvel em: https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/teste-de-urease\/<br \/>\n<\/em><\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Refer\u00eancias<\/strong><\/h2>\n<ol>\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/25705641\/\">Takahiro Uotani, David Y. Graham. Diagnosis of Helicobacter pylori using the rapid urease test Ann Transl Med 2015;3(1):9<\/a><\/li>\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/9398877\/\">Woo JS, el-Zimaity HM, Genta RM, et al. The best gastric site for obtaining a positive rapid ureas test. Helicobacter 1996;1:256-9.<\/a><\/li>\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/10049412\/\">Tu TC, Lee CL, Wu CH, et al. Comparison of invasive and noninvasive tests for detecting Helicobacter pylori infection in bleeding peptic ulcers. Gastrointest Endosc 1999;49:302-6.<\/a><\/li>\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/8857149\/\">Yousfi MM, El-Zimaity HM, Cole RA, et al. Does using a warmer influence the results of rapid urease testing for Helicobacter pylori? Gastrointest Endosc 1996;43:260-1.<\/a><\/li>\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/11375581\/\">Castellote J, Guardiola J, Porta F, Falc\u00f3 A. Rapid urease test: effect of preimmersion of biopsy forceps in formalin.\u00a0<em>Gastrointest Endosc<\/em>. 2001;53(7):744-746. doi:10.1067\/mge.2001.114786<\/a><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>Acesse o <a href=\"https:\/\/endoscopiaterapeutica.net\/pt\/\"><strong>Endoscopia Terap\u00eautica<\/strong><\/a> para tomar contato com mais artigos comentados, assuntos gerais, casos cl\u00ednicos, quizzes, classifica\u00e7\u00f5es e mais!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; O teste de urease ou teste r\u00e1pido de urease (RUT) \u00e9 um teste&hellip;<\/p>\n","protected":false},"author":712,"featured_media":5394,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[151],"tags":[],"ano":[146],"tipo":[153],"volume":[147],"class_list":["post-4822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-assuntosgerais","ano-146","tipo-endoscopia-digestiva-alta","volume-volume-ii"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Teste de urease &#8226; Endoscopia Terapeutica<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/endoscopiaterapeutica.net\/pt\/assuntosgerais\/teste-de-urease\/\" \/>\n<meta property=\"og:locale\" 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