CVS Dr Minoo Movahedi CVS Prenatal diagnosis Chromosome
- Slides: 21
CVS Dr. Minoo Movahedi
CVS Prenatal diagnosis Chromosome & DNA Ten weeks TC & TA
TC – CVS Culture Needle Sterile Speculum Metal sond Syring 20 cc Media Tenaculom
TA - CVS Sterile Gel Sterile Probe Needle Syringe Media Holder P&D Long axis placenta
Multiple Gestations Monochromic Twins : single sample Dechorionic Twins : Separate placentas Ant : TA – CVS Post : TC – CVS Fused Placenta : Placental Margin insertion of Cord Follow up Amniocenteses : 6 %
CVS Indications DNA Karyotyping Mendelian disorder Increased maternal Age Screen down syndrome Family history Paternity Infections
Contraindications TC – CVS Vaginismus Cervical stenosis Cervical Myomas Cervical infection Lower segment myoma Sever antiflextion Retrofelxtion of Uterus
Contraindication of TA – CVS Sever uterine retroflextion With intestinal Loop Fetal position posterior Placenta
All type of CVS Maternal isoimmunization Fetomaternal Hemorrhage Erythroblustosis fetalis
CVS complications Damage or fetal loss < 28 w : 2. 8 – 3. 9 % >28 w : 3. 9 – 4. 2 % TC – CVS increased TA – CVS = Amniocentesis Prenatal mortality rate = 6 -7% Rupture of membering 0. 5 % Bleeding = 1/3 cases - 6% increased VB – 4% Hematoma Infection = 0. 5 % chorioamnionitis , septic shock peritonitis
Placental Mosaicism Direct method (Trophoblasts ) Long term cultures (Mesechymal cells ) Specificity 99. 9 % Sensitivity 99. 6 % Increased IUGR
Limb reduction Defects and Oromandibular hypogenesis GA < 9 weeks Needle Experience
CVS failure obtained TC – CVS > TA – CVS Multiple insertion TC – CVS > TA – CV
Ob complications Controversy PIH Long term Out come No differences
TA & TC CVS TA CVS is preferable: Fetal loss decreased Bleeding decreased Infections decreased Multiple insertions decreased Success rate increased
CVS is safer than early Amniocentesis < 15 weeks
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