Yardımcı Üreme Teknikleri
Özet
Yardımcı üreme teknikleri (YÜT), infertilite tedavisinde kullanılan invaziv ve noninvaziv yöntemleri kapsayan, ilk başarılı örneği 1978 yılında IVF ile dünyaya gelen Louise Brown olan süreçlerdir. Günümüzde en sık tercih edilen teknikler IVF (İn Vitro Fertilizasyon) ve ICSI (Mikroenjeksiyon) olup; GIFT, ZIFT ve TET gibi tubal transfer yöntemleri uygulama zorlukları nedeniyle terk edilmiştir. Tedavi süreçlerinde oosit kalitesi, nükleer ve sitoplazmik maturasyon başarısı, embriyo gelişimi ile implantasyon şansını doğrudan etkilemektedir. Oosit değerlendirmesinde koyu sitoplazma, büyük vakuoller ve SER kümeleri gibi intrasitoplazmik anomaliler ile kalın zona pellusida veya anormal polar cisimcik gibi ekstrasitoplazmik sorunlar incelenir. Fertilizasyon sonrasında embriyolar blastomer sayısı, fragmantasyon derecesi (<%10 iyi kalite), multinükleasyon varlığı ve blastosist aşamasına göre ESHRE konsensus kriterleri doğrultusunda skorlanır. Embriyo transferi (ET), oosit toplanmasından (OPU) sonraki 2-6 gün içinde transabdominal ultrason eşliğinde uterusa travma yaratmadan gerçekleştirilir. Son mevzuatlara göre çoğul gebelikleri önlemek amacıyla embriyo transfer sayıları sınırlandırılmıştır. YÜT, üreme tıbbındaki gelişmelerle infertil çiftlerin anksiyete düzeylerini düşürerek umut olmaya devam etmektedir.
Assisted reproductive technologies (ART) encompass invasive and non-invasive methods used in infertility treatment, with the first successful example being Louise Brown born via IVF in 1978. Today, IVF (In Vitro Fertilization) and ICSI (Intracytoplasmic Sperm Injection) are the most preferred techniques, while tubal transfer methods such as GIFT, ZIFT, and TET have been abandoned due to application difficulties. During treatment, oocyte quality and the success of nuclear and cytoplasmic maturation directly affect embryo development and implantation chances. Oocyte assessment involves examining intra-cytoplasmic anomalies like dark cytoplasm, large vacuoles, and SER clusters, alongside extra-cytoplasmic issues such as a thick zona pellucida or abnormal polar bodies. Following fertilization, embryos are scored according to ESHRE consensus criteria based on blastomere count, fragmentation degree (<10% for good quality), presence of multinucleation, and blastocyst stage. Embryo transfer (ET) is performed without causing trauma to the uterus under transabdominal ultrasound guidance within 2-6 days after oocyte pick-up (OPU). According to recent regulations, the number of transferred embryos is limited to prevent multiple pregnancies. With advancements in reproductive medicine, ART continues to offer hope to infertil couples by reducing their anxiety levels.
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