{"id":607518,"date":"2023-02-28T14:36:19","date_gmt":"2023-02-28T17:36:19","guid":{"rendered":"https:\/\/revistas.uc.cl\/?post_type=tnc_col_606029_item&#038;p=607518"},"modified":"2023-02-28T14:36:19","modified_gmt":"2023-02-28T17:36:19","slug":"ca%c2%b3mo-y-cuando-el-levonorgestrel-previene-el-embarazo-si-se-administra-como-anticonceptivo-de-emergencia","status":"publish","type":"tnc_col_606029_item","link":"https:\/\/revistas.uc.cl\/en\/ars-medica\/ca%c2%b3mo-y-cuando-el-levonorgestrel-previene-el-embarazo-si-se-administra-como-anticonceptivo-de-emergencia\/","title":{"rendered":"C\u00c3\u00b3mo y cu\u00c3\u00a1ndo el levonorgestrel previene el embarazo si se administra como anticonceptivo de emergencia"},"content":{"rendered":"<p>En esta revisi\u00c3\u00b3n se actualiza el mecanismo de acci\u00c3\u00b3n del levonorgestrel (LNG) usado en anticoncepci\u00c3\u00b3n de emergencia. El an\u00c3\u00a1lisis cr\u00c3\u00adtico de la estimaci\u00c3\u00b3n de la eficacia anticonceptiva del LNG indica que su tasa de falla es m\u00c3\u00a1s alta que la publicada. El LNG aumenta la viscosidad del moco cervical impidiendo que los espermatozoides del reservorio cervical vayan a renovar la poblaci\u00c3\u00b3n esperm\u00c3\u00a1tica en el sitio de fecundaci\u00c3\u00b3n. Diversos autores han documentado que LNG suprime el pico preovulatorio de gonadotrofinas e interfiere con el proceso ovulatorio en la mujer y en modelos animales. Administrado despu\u00c3\u00a9s de la ovulaci\u00c3\u00b3n en rata, en la mona Cebus apella y en la mujer, no interfiere con la implantaci\u00c3\u00b3n del embri\u00c3\u00b3n. Se concluye que LNG previene el embarazo solamente cuando se administra en un momento del ciclo menstrual en el cual puede impedir la fecundaci\u00c3\u00b3n y que el m\u00c3\u00a9todo falla cuando la administraci\u00c3\u00b3n es m\u00c3\u00a1s tard\u00c3\u00ada.<\/p>","protected":false},"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","class_list":["post-607518","tnc_col_606029_item","type-tnc_col_606029_item","status-publish","format-standard","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Portal de Revistas<\/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:\/\/revistas.uc.cl\/en\/ars-medica\/ca\u00b3mo-y-cuando-el-levonorgestrel-previene-el-embarazo-si-se-administra-como-anticonceptivo-de-emergencia\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00c3\u00b3mo y cu\u00c3\u00a1ndo el levonorgestrel previene el embarazo si se administra como anticonceptivo de emergencia - Portal de Revistas\" \/>\n<meta property=\"og:description\" content=\"En esta revisi\u00c3\u00b3n se actualiza el mecanismo de acci\u00c3\u00b3n del levonorgestrel (LNG) usado en anticoncepci\u00c3\u00b3n de emergencia. 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