{"id":22101,"date":"2026-09-19T22:01:35","date_gmt":"2026-09-19T22:01:35","guid":{"rendered":"https:\/\/www.lowcostivf.net\/?p=22101"},"modified":"2026-09-19T22:07:55","modified_gmt":"2026-09-19T22:07:55","slug":"when-is-the-right-time-to-trigger","status":"publish","type":"post","link":"https:\/\/www.lowcostivf.net\/fr\/latest-news-from-north-cyprus-ivf-center\/when-is-the-right-time-to-trigger\/","title":{"rendered":"Quel est le bon moment pour d\u00e9clencher l&#039;action ?"},"content":{"rendered":"<h2 class=\"wp-block-heading\"><strong>La science de la taille des follicules, de la maturation finale des ovocytes et de la strat\u00e9gie de double d\u00e9clenchement<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Une fois que la cohorte folliculaire en d\u00e9veloppement a atteint un stade appropri\u00e9, une injection de d\u00e9clenchement est administr\u00e9e pour initier les derni\u00e8res \u00e9tapes de la maturation ovocytaire. Il s&#039;agit d&#039;une des \u00e9tapes les plus cruciales d&#039;un cycle de FIV, car le d\u00e9clenchement stimule la reprise de la m\u00e9iose ovocytaire et pr\u00e9pare les ovocytes matures \u00e0 la ponction.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Le d\u00e9clencheur peut contenir de la gonadotrophine chorionique humaine (hCG), un agoniste de la GnRH ou, chez certaines patientes, une combinaison des deux, appel\u00e9e double d\u00e9clenchement. L&#039;hCG se lie au r\u00e9cepteur de la LH et induit un signal de type LH relativement prolong\u00e9, favorisant la maturation ovocytaire finale. Un d\u00e9clencheur par agoniste de la GnRH, utilis\u00e9 dans un cycle antagoniste, stimule l&#039;hypophyse, entra\u00eenant une br\u00e8ve pouss\u00e9e endog\u00e8ne de LH et de FSH.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Un double d\u00e9clencheur<\/strong>&nbsp;L&#039;hCG est donc associ\u00e9e \u00e0 un agoniste de la GnRH, afin de b\u00e9n\u00e9ficier \u00e0 la fois du pic endog\u00e8ne de LH\/FSH induit par l&#039;agoniste et de l&#039;activit\u00e9 plus soutenue des r\u00e9cepteurs de la LH apport\u00e9e par l&#039;hCG. Cette approche est souvent envisag\u00e9e chez certaines patientes, notamment lorsqu&#039;un cycle pr\u00e9c\u00e9dent a abouti \u00e0 un nombre d&#039;ovocytes matures (MII) inf\u00e9rieur aux attentes, \u00e0 un rendement ovocytaire relativement faible par rapport au nombre de follicules d\u00e9velopp\u00e9s, ou \u00e0 d&#039;autres signes de maturation ovocytaire finale sous-optimale.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Des donn\u00e9es cliniques soutiennent cette approche chez certaines patientes. Une revue syst\u00e9matique et une m\u00e9ta-analyse d&#039;essais contr\u00f4l\u00e9s randomis\u00e9s, r\u00e9alis\u00e9es par Hu et al. (2021) et intitul\u00e9es \u00ab Agoniste de la GnRH et hCG (double d\u00e9clenchement) versus d\u00e9clenchement par hCG pour la maturation folliculaire \u00bb, ont analys\u00e9 1\u00a0048 patientes ayant b\u00e9n\u00e9fici\u00e9 d&#039;une FIV. Compar\u00e9 au d\u00e9clenchement par hCG seul, le double d\u00e9clenchement a permis d&#039;obtenir environ 1,5 ovocyte suppl\u00e9mentaire, un ovocyte mature suppl\u00e9mentaire, un plus grand nombre d&#039;ovocytes f\u00e9cond\u00e9s et d&#039;embryons utilisables, ainsi qu&#039;un taux de naissances vivantes plus \u00e9lev\u00e9 dans l&#039;analyse group\u00e9e. Ces r\u00e9sultats sont encourageants, m\u00eame s&#039;ils ne signifient pas qu&#039;un double d\u00e9clenchement soit n\u00e9cessaire ou sup\u00e9rieur pour toutes les patientes.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quand d\u00e9clenchons-nous le d\u00e9clenchement\u00a0?<\/strong>\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  La taille du follicule est l&#039;un des facteurs les plus importants utilis\u00e9s pour d\u00e9terminer le moment o\u00f9 la maturation finale des ovocytes doit \u00eatre d\u00e9clench\u00e9e, mais il n&#039;existe pas de diam\u00e8tre folliculaire unique optimal pour toutes les femmes.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Dans un cycle de stimulation ovarienne classique, on vise g\u00e9n\u00e9ralement \u00e0 ce que la plupart des follicules cliniquement pertinents mesurent environ 16 \u00e0 21 mm au moment du d\u00e9clenchement de l&#039;ovulation. Cette pratique est globalement conforme aux pratiques internationales de FIV, o\u00f9 le d\u00e9clenchement a g\u00e9n\u00e9ralement lieu lorsque plusieurs follicules dominants atteignent environ 16 \u00e0 22 mm.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Cependant, la relation entre la taille du follicule et la maturit\u00e9 de l&#039;ovocyte est plus complexe que de simplement supposer que \u00ab plus gros, c&#039;est mieux \u00bb. Le moment optimal peut \u00eatre diff\u00e9rent chez les femmes pr\u00e9sentant une r\u00e9serve ovarienne diminu\u00e9e, une faible r\u00e9ponse ovarienne ant\u00e9rieure ou un \u00e2ge reproductif plus avanc\u00e9, en particulier lorsqu&#039;il existe un risque de lut\u00e9inisation ou d&#039;ovulation pr\u00e9matur\u00e9e.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Une \u00e9tude de 2025 intitul\u00e9e&nbsp;<strong>\u00ab D\u00e9termination de la taille folliculaire optimale au moment du d\u00e9clenchement chez les patientes pr\u00e9sentant une r\u00e9serve ovarienne diminu\u00e9e et subissant un cycle d\u2019ICSI \u00bb<\/strong>&nbsp;Nous avons examin\u00e9 430 follicules individuels provenant de 98 femmes pr\u00e9sentant une insuffisance ovarienne. Les follicules mesurant entre 15 et 17 mm ont pr\u00e9sent\u00e9 un taux de ponction ovocytaire de 88,11 %, un taux de maturation MII de 83,31 %, un taux de f\u00e9condation de 97,11 % et un taux d&#039;embryons de qualit\u00e9 optimale de 65,41 %, soit des r\u00e9sultats globaux significativement meilleurs que ceux obtenus avec des follicules mesurant entre 11 et 14 mm ou \u2265 18 mm. Il est important de noter que 13,31 % des patientes initialement programm\u00e9es ont pr\u00e9sent\u00e9 une ovulation pr\u00e9matur\u00e9e, et la taille moyenne du follicule dominant chez ces patientes \u00e9tait de 18,6 mm.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  La m\u00eame \u00e9tude a r\u00e9v\u00e9l\u00e9 que les femmes ayant pr\u00e9sent\u00e9 une ovulation pr\u00e9matur\u00e9e avaient des taux d&#039;AMH significativement plus bas et des taux de FSH plus \u00e9lev\u00e9s, confirmant l&#039;hypoth\u00e8se selon laquelle une r\u00e9serve ovarienne diminu\u00e9e pourrait \u00eatre associ\u00e9e \u00e0 un comportement folliculaire diff\u00e9rent et potentiellement \u00e0 une maturation finale plus pr\u00e9coce. Fait int\u00e9ressant, la taille optimale des follicules (15-17 mm) a \u00e9t\u00e9 observ\u00e9e aussi bien chez les femmes jeunes que chez les femmes plus \u00e2g\u00e9es pr\u00e9sentant une r\u00e9serve ovarienne diminu\u00e9e, ce qui sugg\u00e8re que la r\u00e9serve ovarienne et le comportement folliculaire pourraient \u00eatre plus importants qu&#039;une taille folliculaire standard pour d\u00e9terminer le moment optimal du d\u00e9clenchement de l&#039;ovulation.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Des r\u00e9sultats similaires ont \u00e9t\u00e9 rapport\u00e9s par Lawrenz et al. (2024) dans l\u2019\u00e9tude&nbsp;<strong>\u00ab Les femmes pr\u00e9sentant une r\u00e9serve ovarienne fortement diminu\u00e9e et subissant une f\u00e9condation in vitro en cycle naturel modifi\u00e9 b\u00e9n\u00e9ficient-elles d&#039;un d\u00e9clenchement plus pr\u00e9coce, lorsque les follicules sont de plus petite taille ? \u00bb <\/strong>Chez les femmes pr\u00e9sentant une insuffisance ovarienne s\u00e9v\u00e8re, le d\u00e9clenchement de l&#039;ovulation \u00e0 des follicules de 15 mm ou moins a significativement r\u00e9duit le risque d&#039;ovulation pr\u00e9matur\u00e9e et d&#039;annulation du cycle, comparativement \u00e0 l&#039;attente de follicules plus gros. Il est important de noter que ce d\u00e9clenchement pr\u00e9coce n&#039;a pas significativement diminu\u00e9 la probabilit\u00e9 de recueillir un ovocyte mature. Parmi les cycles ayant abouti \u00e0 un recueil d&#039;ovocytes, les taux de maturit\u00e9 \u00e9taient d&#039;environ 92 % pour les follicules mesurant entre 13 et 15 mm et entre 15 et 17 mm, contre environ 59 % lorsque les follicules \u00e9taient autoris\u00e9s \u00e0 se d\u00e9velopper au-del\u00e0 de 17 mm dans leur analyse de sensibilit\u00e9. Les auteurs ont conclu qu&#039;attendre que les follicules d\u00e9passent 17 mm pourrait en r\u00e9alit\u00e9 \u00eatre d\u00e9savantageux chez certaines femmes pr\u00e9sentant une insuffisance ovarienne s\u00e9v\u00e8re.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Il existe \u00e9galement des preuves que les femmes pr\u00e9sentant une r\u00e9serve ovarienne r\u00e9duite sont plus susceptibles de conna\u00eetre une pouss\u00e9e pr\u00e9matur\u00e9e de LH, m\u00eame lorsqu&#039;un antagoniste de la GnRH est utilis\u00e9. Une \u00e9tude intitul\u00e9e \u00ab<strong>La diminution de la r\u00e9serve ovarienne pr\u00e9dispose \u00e0 des pics pr\u00e9matur\u00e9s d&#039;hormone lut\u00e9inisante lors des cycles d&#039;antagonistes de l&#039;hormone de lib\u00e9ration des gonadotrophines dans la f\u00e9condation in vitro.<\/strong>L\u2019\u00e9tude a r\u00e9v\u00e9l\u00e9 que les patients pr\u00e9sentant des pics pr\u00e9matur\u00e9s de LH \u00e9taient g\u00e9n\u00e9ralement plus \u00e2g\u00e9s et avaient un taux de FSH de base plus \u00e9lev\u00e9, un taux d\u2019AMH plus faible et un nombre de follicules antraux plus faible que les patients non affect\u00e9s.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Ces r\u00e9sultats concordent avec nos observations cliniques. Chez certaines patientes, notamment celles pr\u00e9sentant une insuffisance ovarienne, des ant\u00e9c\u00e9dents de lut\u00e9inisation pr\u00e9coce ou des ovocytes matures \u00e0 des diam\u00e8tres folliculaires plus petits, nous envisageons un d\u00e9clenchement de l&#039;ovulation plus pr\u00e9coce, parfois lorsque la majorit\u00e9 des follicules cliniquement pertinents mesurent environ 14 \u00e0 18 mm, plut\u00f4t que d&#039;attendre que la plupart atteignent la taille conventionnelle.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Cela ne signifie pas que toutes les femmes \u00e2g\u00e9es ou celles pr\u00e9sentant une r\u00e9serve ovarienne diminu\u00e9e doivent b\u00e9n\u00e9ficier d&#039;un d\u00e9clenchement pr\u00e9coce de l&#039;ovulation. Le moment du d\u00e9clenchement doit rester individualis\u00e9. Un d\u00e9clenchement trop pr\u00e9coce peut entra\u00eener une proportion plus importante d&#039;ovocytes immatures, tandis qu&#039;un d\u00e9clenchement trop tardif peut accro\u00eetre le risque de lut\u00e9inisation ou d&#039;ovulation pr\u00e9matur\u00e9e chez les patientes pr\u00e9dispos\u00e9es.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  C\u2019est pourquoi nous ne prenons pas notre d\u00e9cision uniquement en fonction de la taille du follicule. Nous prenons en compte <em>le nombre et la r\u00e9partition des tailles de follicules, <\/em>\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>\u00e2ge du patient,<\/em><br><em>AMH et nombre de follicules antraux,<\/em><br><em>R\u00e9ponse ant\u00e9rieure \u00e0 la FIV, dur\u00e9e de la stimulation,<\/em><br><em>taux de maturit\u00e9 ovocytaire ant\u00e9rieurs et,<\/em><br><em>Taux s\u00e9riques d&#039;\u0153stradiol, de LH et de progest\u00e9rone.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  L\u2019objectif n\u2019est pas n\u00e9cessairement de produire les follicules les plus gros possibles, mais d\u2019identifier le moment o\u00f9 la plus grande proportion de la cohorte d\u2019ovocytes disponibles est susceptible d\u2019avoir atteint la capacit\u00e9 de d\u00e9veloppement sans attendre inutilement longtemps.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Moment du pr\u00e9l\u00e8vement des ovocytes<\/strong>\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Une fois l&#039;injection de d\u00e9clenchement administr\u00e9e, le timing devient crucial. La ponction ovocytaire est g\u00e9n\u00e9ralement programm\u00e9e environ 35 \u00e0 36 heures plus tard, ce qui laisse suffisamment de temps pour la maturation finale des ovocytes et permet de les pr\u00e9lever avant la rupture folliculaire spontan\u00e9e et l&#039;ovulation.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  C\u2019est pourquoi l\u2019injection de d\u00e9clenchement doit \u00eatre administr\u00e9e pr\u00e9cis\u00e9ment au moment indiqu\u00e9 par l\u2019\u00e9quipe m\u00e9dicale. M\u00eame un cycle de stimulation bien con\u00e7u peut \u00eatre compromis si l\u2019injection est administr\u00e9e beaucoup plus t\u00f4t ou plus tard que pr\u00e9vu.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Les dimensions folliculaires et le calendrier \u00e9voqu\u00e9s ci-dessus doivent donc \u00eatre consid\u00e9r\u00e9s comme des valeurs de r\u00e9f\u00e9rence cliniques plut\u00f4t que comme des r\u00e8gles fixes. La croissance folliculaire et la maturation ovocytaire peuvent varier d&#039;une patiente \u00e0 l&#039;autre, voire d&#039;un cycle \u00e0 l&#039;autre chez une m\u00eame patiente. La d\u00e9cision finale concernant le type et le moment du d\u00e9clenchement de l&#039;ovulation doit toujours \u00eatre individualis\u00e9e en fonction du tableau clinique complet.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>Dr Ahmet Ozyigit,<\/strong><br><em>MD, MSc, PgDip, FAAMM, ABAARM<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00f4pital d&#039;\u00e9lite<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Les r\u00e9f\u00e9rences:<\/strong>\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  1. Hu KL, Wang S, Ye X, Zhang D, Hunt S. Agoniste de la GnRH et hCG (double d\u00e9clenchement) versus d\u00e9clenchement par hCG pour la maturation folliculaire\u00a0: revue syst\u00e9matique et m\u00e9ta-analyse d\u2019essais randomis\u00e9s. Reproductive Biology and Endocrinology. 2021\u00a0;19\u00a0:78. DOI\u00a0: 10.1186\/s12958-021-00766-5.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  2. Naghshineh E, Ghasemi Tehrani H, Mehrabian F, Mardanian F, Rezaei M.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  D\u00e9termination de la taille folliculaire optimale au moment du d\u00e9clenchement de l&#039;ovulation chez les patientes pr\u00e9sentant une r\u00e9serve ovarienne diminu\u00e9e et b\u00e9n\u00e9ficiant d&#039;une ICSI. Journal of Ovarian Research. 2025;18(1):284. DOI\u00a0: 10.1186\/s13048-025-01873-2.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  3. Lawrenz B, Kalafat E, Ata B, Melado L, Del Gallego R, Elkhatib I, Fatemi H.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  Les femmes pr\u00e9sentant une insuffisance ovarienne s\u00e9v\u00e8re et b\u00e9n\u00e9ficiant d&#039;une f\u00e9condation in vitro en cycle naturel modifi\u00e9 tirent-elles un b\u00e9n\u00e9fice d&#039;un d\u00e9clenchement plus pr\u00e9coce de l&#039;ovulation, lorsque les follicules sont plus petits\u00a0? Ultrasound in Obstetrics &amp; Gynecology. 2024;64(2):245\u2013252. DOI\u00a0: 10.1002\/uog.27611.\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n  4. Kochhar PK, Ghosh P. Une r\u00e9serve ovarienne diminu\u00e9e pr\u00e9dispose \u00e0 des pics pr\u00e9matur\u00e9s de LH lors de cycles avec antagonistes de la GnRH en f\u00e9condation in vitro. Journal of Human Reproductive Sciences. 2020;13(3):191\u2013195. DOI\u00a0: 10.4103\/jhrs.JHRS_133_19\n<\/p>","protected":false},"excerpt":{"rendered":"<p>The Science of Follicle Size, Final Oocyte Maturation, and the Dual Trigger Strategy Once the developing follicular cohort has reached an appropriate stage, a&nbsp;trigger injection&nbsp;is administered to initiate the final stages of oocyte maturation. This is one of the most precisely timed steps of an IVF cycle, as the trigger promotes resumption of oocyte meiosis [&hellip;]<\/p>","protected":false},"author":2,"featured_media":22102,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-22101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infertility-treatment"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>When Is the Right Time to Trigger? - North Cyprus IVF<\/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:\/\/www.lowcostivf.net\/fr\/latest-news-from-north-cyprus-ivf-center\/when-is-the-right-time-to-trigger\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When Is the Right Time to Trigger? - North Cyprus IVF\" \/>\n<meta property=\"og:description\" content=\"The Science of Follicle Size, Final Oocyte Maturation, and the Dual Trigger Strategy Once the developing follicular cohort has reached an appropriate stage, a&nbsp;trigger injection&nbsp;is administered to initiate the final stages of oocyte maturation. This is one of the most precisely timed steps of an IVF cycle, as the trigger promotes resumption of oocyte meiosis [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.lowcostivf.net\/fr\/latest-news-from-north-cyprus-ivf-center\/when-is-the-right-time-to-trigger\/\" \/>\n<meta property=\"og:site_name\" content=\"North Cyprus IVF\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/northcyprusivf\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/northcyprusivf\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-19T22:01:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-19T22:07:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.lowcostivf.net\/wp-content\/uploads\/2026\/09\/When-Is-the-Right-Time-to-Trigger.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1312\" \/>\n\t<meta property=\"og:image:height\" content=\"736\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Asst. 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