Prenatal İnvaziv Tanı Yöntemleri
Özet
Prenatal invaziv tanı yöntemleri olan koryonik villus örneklemesi (CVS), amniyosentez ve fetal kan örneklemesi (FKÖ); teknik yaklaşımları, endikasyonları ve komplikasyonları açısından değerlendirilmektedir. Genellikle 10-13. gebelik haftalarında prenatal genetik tanı için uygulanan CVS, amniyosenteze kıyasla daha erken sonuç sağlama avantajı sunsa da daha yüksek fetal kayıp ve plasentaya sınırlı mozaisizm gibi tanısal belirsizlik riskleri barındırır. Transabdominal ve transservikal olmak üzere iki yöntemle yapılabilen CVS'de, transabdominal yaklaşım daha yüksek ilk deneme başarısı nedeniyle öncelikle tercih edilir. Genetik çalışmalar için optimal olarak 15-17. haftalarda gerçekleştirilen amniyosentez, transabdominal yoldan iğne ile amniyotik sıvı çekilmesi işlemidir ve işleme bağlı fetal kayıp riski %0,1-0,3 gibi oldukça düşük seviyelerdedir. Kordosentez olarak da bilinen fetal kan örneklemesi ise diğer yöntemlerin yetersiz kaldığı genetik bozukluklar veya şiddetli fetal anemi şüphelerinde kordon, intrahepatik ven veya kalpten kan alınarak gerçekleştirilir. FKÖ, kanama, bradikardi, enfeksiyon ve %1,4-1,9 oranında fetal kayıp gibi daha yüksek majör riskler taşır. Tüm invaziv süreçlerde çoğul gebeliklerde koryonisitenin belirlenmesi ve RhD-negatif hastalara anti-D immünoglobulin uygulanması kritik önem taşımaktadır.
Prenatal invasive diagnostic methods, including chorionic villus sampling (CVS), amniocentesis, and fetal blood sampling (FBS), are evaluated regarding their technical approaches, indications, and complications. CVS, generally performed at 10-13 weeks of gestation for genetic diagnosis, offers the advantage of earlier results compared to amniocentesis but carries higher risks of fetal loss and diagnostic uncertainty, such as confined placental mosaicism. Practiced via transabdominal or transcervical routes, transabdominal CVS is primarily preferred due to its higher first-attempt success rate. Amniocentesis, optimally performed at 15-17 weeks for genetic studies, involves withdrawing amniotic fluid transabdominally with a needle, maintaining a very low procedure-related fetal loss risk of 0.1-0.3%. Fetal blood sampling, also known as cordocentesis, is performed by sampling blood from the umbilical cord, intrahepatic vein, or heart, restricted to cases where other methods fail to provide adequate diagnosis for genetic disorders or severe fetal anemia. FBS carries higher major risks, including hemorrhage, bradycardia, infection, and a fetal loss rate of 1.4-1.9%. In all invasive procedures, determining chorionicity in multiple pregnancies and administering anti-D immunoglobulin to RhD-negative patients are critically important.
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