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Flashcards in OB Procedures Deck (11):
1

Ultrasound--Abdominal v. Transvaginal V. Doppler

Doppler tells you fetal blood flow

2

Indications for U/S

ectopic pregnancy (location) & Viability
gest age dating
multiple gestation
amniotic fluid volume (oligohydramnios)
fetal growth (HTN, DMII)
Fetal wellbeing (breathing)
fetal anomalies
placenta previa
fetal anemia

3

Genetic Ultrasound

done betw 18-20 wks to ID fetal markers of aneuploidy
-looks for structural (nuchal skin fold [strongest] thickness; shortened limb bones; pyelectasis; heart echogenecity; hyperechoic bowel)

4

Nuchal Translucency

measures fluid behind the neck
-thickened NT increases likelihood of aneuploidy and cardiac disease

5

First trimester screening has

two blood tests (PAPP-A, hCG) and NT measurement

6

Second trimester screening (Expanded X-AFP) has

four blood tests (MS-AFP, beta-hCG, estriol, inhibin)

7

Chorionic Villous Sampling

done trans abd or transcervically
10-12 wks
-under ultrasound guidance
-takes placental tissue -risk of pregnancy loss

8

Amniocentesis is done

10-14 weeks
after 15 weeks (not enough amnioic fluid)
-needle does into amniotic sac and aspirated containing living fetal cells to get karyotypes

9

What is the screening performed on the amniotic fluid?

AFP

10

PUBS- percutaneous umbilical sampling

needle into umbilical vein after 20 wks gestation and you analyze the blood gases, karyotype, antibodies, electrolytes
-can give transfusion if fetal anemia

11

Fetoscopy perfomed after 20 weeks

indication - intrauterine surgery
-lasering umbilical for twin-twin transfusion