{"id":16609,"date":"2023-06-08T17:44:47","date_gmt":"2023-06-08T16:44:47","guid":{"rendered":"https:\/\/now-fertility.com\/role-de-la-supplementation-en-lh-dans-la-stimulation-ovarienne\/"},"modified":"2023-06-08T17:44:47","modified_gmt":"2023-06-08T16:44:47","slug":"role-de-la-supplementation-en-lh-dans-la-stimulation-ovarienne","status":"publish","type":"post","link":"https:\/\/now-fertility.com\/fr\/role-de-la-supplementation-en-lh-dans-la-stimulation-ovarienne\/","title":{"rendered":"R\u00f4le de la suppl\u00e9mentation en LH dans la stimulation ovarienne"},"content":{"rendered":"<p class=\"lead\">L\u2019hormone folliculostimulante (FSH) et l\u2019hormone lut\u00e9inisante (LH) sont deux hormones s\u00e9cr\u00e9t\u00e9es par l\u2019ante hypophyse. Ils travaillent en synergie afin de stimuler la croissance folliculaire, la maturation ovocytaire et la s\u00e9cr\u00e9tion d\u2019\u0153stradiol. Pour exercer son activit\u00e9 biologique, la LH est fix\u00e9e sur le r\u00e9cepteur LH\/HCG qui est principalement situ\u00e9 sur les cellules th\u00e8ques de l\u2019ovaire.<\/p>\n<p>Le traitement par gonadotrophines pendant les cycles de FIV est associ\u00e9 \u00e0 l\u2019administration d\u2019analogues de la GnRH pour pr\u00e9venir l\u2019apparition d\u2019une pouss\u00e9e pr\u00e9matur\u00e9e de LH et r\u00e9duire la s\u00e9cr\u00e9tion endog\u00e8ne de LH. Mais y a-t-il un besoin minimal d\u2019activit\u00e9 LH pour soutenir la st\u00e9ro\u00efdogen\u00e8se?<\/p>\n<p>Une revue Cochrane (Mochtar et al, 2017) n\u2019a montr\u00e9 aucune preuve claire du b\u00e9n\u00e9fice de la LH combin\u00e9e \u00e0 la FSH par rapport \u00e0 la FSH recombinante seule dans les cycles de <a href=\"https:\/\/now-fertility.com\/services\/ivf-icsi\/\">traitement de FIV ou d\u2019ICSI<\/a> . Cependant, dans de nombreuses \u00e9tudes incluses, les patients \u00e9taient jeunes et avaient un \u00e2ge moyen de 32 ans.<\/p>\n<p>Une revue syst\u00e9matique (Alviggi et al, 2018) sur la suppl\u00e9mentation en LH recombinante dans la technologie de procr\u00e9ation assist\u00e9e a montr\u00e9 qu\u2019il existe une population de patients qui a besoin d\u2019une suppl\u00e9mentation en LH. Le follicule a un niveau n\u00e9cessaire d\u00e9termin\u00e9 de LH. Cette activit\u00e9 LH soutient le d\u00e9veloppement et la maturation du follicule dominant. Les analogues de la GnRH cr\u00e9ent un \u00e9tat hypogonadotrope relatif et une diminution des niveaux de LH. Malgr\u00e9 la r\u00e9gulation n\u00e9gative, le taux de LH restant est suffisant : moins de 1% des r\u00e9cepteurs de la LH doivent \u00eatre stimul\u00e9s pour une st\u00e9ro\u00efdogen\u00e8se normale.<\/p>\n<p>Les preuves de la n\u00e9cessit\u00e9 d\u2019une suppl\u00e9mentation en LH existent dans les sous-groupes de patients suivants:<\/p>\n<ul>\n<li>Toutes les patientes pr\u00e9sentant un hypogonadisme hypogonadotrope (anovulation OMS I): chez ces patientes, l\u2019ajout de LH \u00e0 la FSH lors de la stimulation conduit \u00e0 un nombre plus \u00e9lev\u00e9 de follicules obtenus et \u00e0 des niveaux suffisants d\u2019\u0153stradiol pour une prolif\u00e9ration endom\u00e9triale optimale.<\/li>\n<li>Patients \u00e2g\u00e9s de 35 \u00e0 39 ans: Les patients en \u00e2ge de procr\u00e9er avanc\u00e9 ont moins de r\u00e9cepteurs fonctionnels de la LH, des taux de FSH et de LH endog\u00e8nes moins puissants et biologiquement actifs et de faibles taux d\u2019androg\u00e8nes circulants.<\/li>\n<li>Hypor\u00e9sondeurs \u00e0 la stimulation FSH uniquement: La pr\u00e9diction d\u2019une mauvaise r\u00e9ponse \u00e0 la stimulation ovarienne a \u00e9t\u00e9 bas\u00e9e sur les crit\u00e8res ESHRE Bologne, y compris l\u2019\u00e2ge, les tests de r\u00e9serve ovarienne (hormone antim\u00fcll\u00e9rienne (AMH), num\u00e9ration des follicules antraux (AFC)) et le nombre d\u2019ovocytes pr\u00e9lev\u00e9s lors d\u2019une stimulation pr\u00e9c\u00e9dente. Cependant, au cours des derni\u00e8res ann\u00e9es, un sous-groupe de patientes a \u00e9t\u00e9 distingu\u00e9, ayant une r\u00e9ponse sous-optimale \u00e0 la stimulation avec des tests de r\u00e9serve ovarienne corrects. Cela a conduit \u00e0 une nouvelle classification des hypor\u00e9sondeurs appel\u00e9e POSEIDON (Patient-Oriented Strategy Encompassing IndividualizeD Oocyte Number). Les hypor\u00e9sondeurs peuvent avoir besoin de doses plus \u00e9lev\u00e9es de FSH, d\u2019une dur\u00e9e de stimulation plus longue et d\u2019une suppl\u00e9mentation en LH. Cela peut s\u2019expliquer par un polymorphisme des r\u00e9cepteurs FSH ou LH. La suppl\u00e9mentation en LH chez ces patientes entra\u00eene un nombre plus \u00e9lev\u00e9 d\u2019ovocytes pr\u00e9lev\u00e9s, davantage d\u2019ovocytes de m\u00e9taphase II, des taux d\u2019implantation et de grossesse clinique plus \u00e9lev\u00e9s (Conforti et al, 2019).<\/li>\n<\/ul>\n<h3>Quelle dose de LH et quand commencer?<\/h3>\n<p>C\u2019est encore une question de d\u00e9bat. La LH peut \u00eatre commenc\u00e9e soit dans la phase folliculaire moyenne pour sauver le cycle en cours, soit au jour 1 de la stimulation. 150 U par jour semblent donner un taux plus \u00e9lev\u00e9 d\u2019ovocytes de m\u00e9taphase II.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019hormone folliculostimulante (FSH) et l\u2019hormone lut\u00e9inisante (LH) sont deux hormones s\u00e9cr\u00e9t\u00e9es par l\u2019ante hypophyse. Ils travaillent en synergie afin de stimuler la croissance folliculaire, la maturation ovocytaire et la s\u00e9cr\u00e9tion d\u2019\u0153stradiol. Pour exercer son activit\u00e9 biologique, la LH est fix\u00e9e sur le r\u00e9cepteur LH\/HCG qui est principalement situ\u00e9 sur les cellules th\u00e8ques de l\u2019ovaire. Le [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16438,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"2959","stick-header-meta":"enabled","header-above-stick-meta":"on","header-main-stick-meta":"on","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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