{"id":20760,"date":"2025-02-06T13:05:50","date_gmt":"2025-02-06T13:05:50","guid":{"rendered":"https:\/\/ceafi.edu.br\/site\/?p=20760"},"modified":"2025-02-06T13:41:45","modified_gmt":"2025-02-06T13:41:45","slug":"imprecisao-dos-oximetros-em-individuos-de-pele-mais-escura","status":"publish","type":"post","link":"https:\/\/ceafi.edu.br\/site\/2025\/02\/06\/imprecisao-dos-oximetros-em-individuos-de-pele-mais-escura\/","title":{"rendered":"Imprecis\u00e3o dos ox\u00edmetros em indiv\u00edduos de pele mais escura"},"content":{"rendered":"<p><strong>Imprecis\u00e3o dos ox\u00edmetros em indiv\u00edduos de pele mais escura<\/strong><\/p>\n<p>Ox\u00edmetros de pulso s\u00e3o calibrados em pacientes com pele mais clara. Os fabricantes reconheceram o desempenho abaixo do ideal dos dispositivos em pacientes de pele mais escura por d\u00e9cadas, mas n\u00e3o enfrentaram nenhuma press\u00e3o regulat\u00f3ria ou legal s\u00e9ria para agir. Em 2013, o FDA (<em>Food and Drug Administration<\/em>, ag\u00eancia federal regulat\u00f3ria americana) emitiu uma sugest\u00e3o para que os fabricantes testassem os dispositivos em pacientes \u201ccom uma variedade de pigmenta\u00e7\u00f5es de pele\u201d. Mas o padr\u00e3o era frouxo: apenas dois indiv\u00edduos com pigmenta\u00e7\u00e3o escura, ou 15% do total, eram necess\u00e1rios. De acordo com uma an\u00e1lise de 2023 de solicita\u00e7\u00f5es de aprova\u00e7\u00e3o do FDA, at\u00e9 2020, os fabricantes estavam cumprindo com um m\u00ednimo de esfor\u00e7o \u2014 por exemplo, testando em 12 indiv\u00edduos, \u201c3 pessoas com pele m\u00e9dia, 6 com pele clara e 3 com pigmenta\u00e7\u00e3o de pele escura\u201d. O FDA tamb\u00e9m n\u00e3o especificou padr\u00f5es para medir a colora\u00e7\u00e3o da pele, o que permitiu que os fabricantes exclu\u00edssem os indiv\u00edduos com pigmenta\u00e7\u00e3o mais escura, nos quais os ox\u00edmetros de pulso apresentam pior desempenho.<\/p>\n<p>Em 2020, durante a pandemia de COVID-19, pesquisadores da Universidade de Michigan relataram em uma carta ao <em>New England Journal of Medicine<\/em> que em 12% dos pacientes com pele mais escura, os ox\u00edmetros de pulso superestimaram sua satura\u00e7\u00e3o de oxig\u00eanio, lendo 92 a 96% quando os gases sangu\u00edneos arteriais confirmaram que o valor verdadeiro era inferior a 88%. (Um grau semelhante de superestima\u00e7\u00e3o ocorreu em 3,6% dos pacientes com pele clara.)<\/p>\n<p>Tal achado permite situa\u00e7\u00f5es de risco como por exemplo: \u201crisco aumentado de fal\u00eancia de \u00f3rg\u00e3os ou morte em pacientes com hipoxemia grave n\u00e3o reconhecida devido a leituras falsas\u201d.<\/p>\n<p>Em janeiro de 2025, a FDA divulgou orienta\u00e7\u00f5es mais espec\u00edficas para fabricantes de ox\u00edmetros de pulso, incentivando padr\u00f5es de teste mais rigorosos em pacientes com pele escura. Uma das maiores mudan\u00e7as sugere testar ox\u00edmetros de pulso em pelo menos 150 pessoas (anteriormente, apenas 10 indiv\u00edduos eram considerados adequados) e usar medi\u00e7\u00f5es objetivas do tom de pele, como a escala <em>Monk Skin Tone<\/em> ou medi\u00e7\u00f5es espectrofotom\u00e9tricas. Pelo menos um quarto dos participantes deve ter tons de pele escuros, e metade deles (um oitavo da amostra total) deve ter pele muito escura. Outro ponto importante est\u00e1 no fato de que a rotulagem dos aparelhos deve refletir que os dispositivos foram testados em pessoas com diversos tons de pele.<\/p>\n<p>Tal discuss\u00e3o tem levantado inclusive repercuss\u00f5es jur\u00eddicas. Em 2022, uma a\u00e7\u00e3o coletiva foi movida contra a <em>Apple<\/em> em Nova York alegando que o ox\u00edmetro de pulso dos <em>Apple Watches<\/em> era impreciso em pacientes de pele escura.<\/p>\n<p><strong>Por que os ox\u00edmetros de pulso t\u00eam pior desempenho em pele escura?<\/strong><\/p>\n<p>Os ox\u00edmetros de pulso emitem luz vermelha e infravermelha que passa pela ponta do dedo (ou outro leito de tecido comprimido) at\u00e9 um sensor no outro lado. \u00c0 medida que a luz passa pelo tecido, parte dela \u00e9 absorvida pela hemoglobina. As hemoglobinas desoxigenada e oxigenada absorvem luz em diferentes comprimentos de onda (660 nm e 940 nm, respectivamente). O algoritmo no ox\u00edmetro de pulso \u00e9 ajustado para reconhecer o sangue arterial pulsante como oxigenado, e o n\u00e3o puls\u00e1til como desoxigenado. Usando algoritmos espec\u00edficos, a propor\u00e7\u00e3o de luz em frequ\u00eancias variadas que \u00e9 absorvida durante a fase puls\u00e1til \u00e9 indexada a um valor de satura\u00e7\u00e3o de oxig\u00eanio, que \u00e9 exibido.<\/p>\n<p>Pessoas com pigmenta\u00e7\u00e3o mais escura t\u00eam mais melanina, que absorve luz em um amplo espectro de comprimentos de onda, incluindo luz vermelha e infravermelha. Os algoritmos, ajustados para pacientes com pele mais clara, tendem a processar a luz \u201cperdida\u201d que foi absorvida pela melanina como tendo sido absorvida pela hemoglobina. O algoritmo calcula e relata uma satura\u00e7\u00e3o de oxig\u00eanio falsamente alta.<\/p>\n<p><strong><em>Por: Giulliano Gardenghi<\/em><\/strong><\/p>\n<p><strong><em>Coordenador Cient\u00edfico da Faculdade CEAFI<\/em><\/strong><\/p>\n<p><strong>Refer\u00eancia<\/strong><\/p>\n<p>Wong et al. Analysis of Discrepancies Between Pulse Oximetry and Arterial Oxygen Saturation Measurements by Race and Ethnicity and Association With Organ Dysfunction and Mortality. JAMA 2021.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imprecis\u00e3o dos ox\u00edmetros em indiv\u00edduos de pele mais escura Ox\u00edmetros de pulso s\u00e3o calibrados em pacientes com pele mais clara. Os fabricantes reconheceram o desempenho abaixo do ideal dos dispositivos em pacientes de pele mais escura por d\u00e9cadas, mas n\u00e3o enfrentaram nenhuma press\u00e3o regulat\u00f3ria ou legal s\u00e9ria para agir. Em 2013, o FDA (Food and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20761,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[17],"tags":[51,31],"class_list":["post-20760","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-blog","tag-ceaficomunica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Imprecis\u00e3o dos ox\u00edmetros em indiv\u00edduos de pele mais escura - CEAFI<\/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:\/\/ceafi.edu.br\/site\/2025\/02\/06\/imprecisao-dos-oximetros-em-individuos-de-pele-mais-escura\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Imprecis\u00e3o dos ox\u00edmetros em indiv\u00edduos de pele mais escura - CEAFI\" \/>\n<meta property=\"og:description\" content=\"Imprecis\u00e3o dos ox\u00edmetros em indiv\u00edduos de pele mais escura Ox\u00edmetros de pulso s\u00e3o calibrados em pacientes com pele mais clara. Os fabricantes reconheceram o desempenho abaixo do ideal dos dispositivos em pacientes de pele mais escura por d\u00e9cadas, mas n\u00e3o enfrentaram nenhuma press\u00e3o regulat\u00f3ria ou legal s\u00e9ria para agir. 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