Obstetrics

Question 1

1st trimester measurement

Answer 1

Crown rump length(may include nuchal translucency)

Question 2

Energy output from Doppler can be ___ times more intense than that of Bmode us

Answer 2

10-15 times

Question 3

Effects most significant in 1st trimester

Answer 3

Potential cavitation and tissue disruption

Question 4

Embryonic period

Answer 4

0-10 weeks

Question 5

Read

Answer 5

Question 6

Tiny well-defined cystic structure implanted within the echogenic decidua

Answer 6

Intradecidual sign (4.5 weeks)

Question 7

Visualization of three layers of decidua early in pregnancy

Answer 7

Double decidua sign

Question 8

Normal sac has an echogenic border of

Answer 8

Greater than 2mm

Question 9

1) Lines the endometrial cavity
2) Covers the gestational sac
3) Contributes to the formation of the placenta at the site of implantation

Answer 9

1) Decidua Vera
2) Decidua Capsularis
3) Decidua Basalis

Question 10

Thin stalk connected to the mid-gut of the embryo.

Meckel diverticulum

Answer 10

Vitelline duct (omphalomesenteric duct)

Question 11

Earliest site of blood cell formation in the embryo

Answer 11

Yolk sac

Question 12

Embryo develops within the ___ while the yolk sac develops in the ____

Answer 12

Amniotic cavity; chorionic cavity

Question 13

Earliest cardiac activity can be detected at

Answer 13

Approximately 6 weeks

Question 14

Fetal urine production begins at

Answer 14

10 weeks

Question 15

Fusion of amnion and chorion at

Answer 15

14-16 weeks

Question 16

Measurements

1) before embryo
2) embryo is visualized

Answer 16

1) MSD (mean sac diameter)

2) CRL (crown rump length)

Question 17

Hindbrain forms a prominent structure that becomes the normal 4th ventricle

Answer 17

6-8 weeks

Question 18

___ Midgut herniates into the base of the umbilicus forming a physiologic omphalocele ____

Answer 18

9-11 weeks; 6 - 9 mm in size

Question 19

CRL is useful until

Answer 19

12 weeks GA

Question 20

BPD is measured on an axial image of the fetal head at the level of

Answer 20

3rd ventricle and thalamus

Question 21

Parameters to assess for acute hypoxia (4)

Answer 21

Reactive fetal heart rate
Respiratory activity
Gross motor movements
Fetal tone

Question 22

Parameter for chronic hypoxia (1)

Answer 22

Amniotic fluid volume

Question 23

Placenta

1) 1st apparent at
2) disk like at
3) finely granular and homogenous at

Answer 23

1) 8 weeks
2) 12 weeks
3) 18 weeks

Question 24

MC tumor of the placenta

Answer 24

Chorioangioma

Question 25

Normal umbilical cord

Answer 25

2 arteries

1 vein