Obstetrics Flashcards

1
Q

1st trimester measurement

A

Crown rump length(may include nuchal translucency)

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2
Q

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

A

10-15 times

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3
Q

Effects most significant in 1st trimester

A

Potential cavitation and tissue disruption

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4
Q

Embryonic period

A

0-10 weeks

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5
Q

Read

A
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6
Q

Tiny well-defined cystic structure implanted within the echogenic decidua

A

Intradecidual sign (4.5 weeks)

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7
Q

Visualization of three layers of decidua early in pregnancy

A

Double decidua sign

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8
Q

Normal sac has an echogenic border of

A

Greater than 2mm

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9
Q

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

A

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

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10
Q

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

Meckel diverticulum

A

Vitelline duct (omphalomesenteric duct)

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11
Q

Earliest site of blood cell formation in the embryo

A

Yolk sac

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12
Q

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

A

Amniotic cavity; chorionic cavity

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13
Q

Earliest cardiac activity can be detected at

A

Approximately 6 weeks

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14
Q

Fetal urine production begins at

A

10 weeks

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15
Q

Fusion of amnion and chorion at

A

14-16 weeks

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16
Q

Measurements

1) before embryo
2) embryo is visualized

A

1) MSD (mean sac diameter)

2) CRL (crown rump length)

17
Q

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

A

6-8 weeks

18
Q

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

A

9-11 weeks; 6 - 9 mm in size

19
Q

CRL is useful until

A

12 weeks GA

20
Q

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

A

3rd ventricle and thalamus

21
Q

Parameters to assess for acute hypoxia (4)

A

Reactive fetal heart rate
Respiratory activity
Gross motor movements
Fetal tone

22
Q

Parameter for chronic hypoxia (1)

A

Amniotic fluid volume

23
Q

Placenta

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

A

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

24
Q

MC tumor of the placenta

A

Chorioangioma

25
Q

Normal umbilical cord

A

2 arteries

1 vein