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OBGYN > 1st Trimester > Flashcards

1st Trimester Flashcards

1
Q

After ovulation, conception usually occurs within ____

A

24 hours

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2
Q

Sperm + ovum =

A

Zygote

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3
Q

Zygote forms into the ___

A

Morula

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4
Q

Morula becomes the ___

A

Blastocyst

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5
Q

Outer layer of blastocyst is made up of _____ cells

A

Trophoblastic cells

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6
Q

The cells that produce hCG

A

Trophoblastic cells

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7
Q

Inner part of blastocyst develops into

A

Embryo, amnion, umbilical cord, yolk sacs

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8
Q

Trophoblastic tissue develops into

A

Placenta and chorion

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9
Q

Blastocyst begins to implant into the decidualized endometrium by day ___ of menstrual cycle

A

Day 20-21 of menstrual cycle

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10
Q

Implantation is complete by day

A

Day 28

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11
Q

Blastocyst connects to endometrium via small projections called:

A

Chorionic villi

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12
Q

Chorion

A

Gestational sac

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13
Q

HCG is detected in the maternal blood as early as

A

23 days menstrual age

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14
Q

Gestational sac should be visualized transvaginally when hCG levels are

A

Between 1000 and 2000 mlU

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15
Q

Normal hCG levels double every ____ hours in the 1st trimester

A

48 hours

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16
Q

In first trimester, thermal index should be kept below ____

A

1

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17
Q

Decidual reaction

A

Endometrium becomes thick and echogenic in preparation for implantation

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18
Q

First definitive sonographic sign of an IUP

A

Gestational sac

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19
Q

To distinguish gestational sac vs pseudogestational sac, look for

A

Double sac sign or double decidual sign

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20
Q

Double sac/ double decidual sign

A

Two rings surrounding a true gestational sac. Inner(capsularis) outer(parietalis)

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21
Q

What sign is this

A

Double sac sign or double decidual sign

22
Q

The short arrows are pointing to

A

Decidua capsularis

23
Q

The long arrows are pointing to

A

Decidua parietalis

24
Q

Earliest measurement to date pregnancy

A

Mean Sac Diameter(MSD)

25
Q

Adding ____ to the MSD, in mm, is an estimate to gestational age

A

By adding 30 to MSD

26
Q

MSD of ____ that doesn’t have a fetal pole is abnormal

A

> 25 mm

27
Q

First structure within gestational sac

A

Secondary Yolk sac

28
Q

Yolk sac produces

A

AFP

29
Q

Yolk sac is connected to the embryo by

A

Vitelline duct

30
Q

Vitillene duct aka

A

Omphalomesenteric duct

31
Q

Yolk sacs role in early pregnancy

A

Nutrient transfer and hematopoiesis

32
Q

Vitelline/omphalomesenteric duct contains ___ vein and ____ artery

A

1 vein and 1 artery

33
Q

Yolk sac is within the ___ cavity

A

Chorionic cavity

34
Q

Gestational sac contains ____ cavities

A

Two cavities. 1. Chorionic 2. Amniotic

35
Q

Amniotic cavity contains

A

Amniotic fluid and embryo

36
Q

Amnion and chorion are fused by ____ weeks

A

16 weeks

37
Q

Embryo will grow at a rate of ____ per day

A

1mm per day in first trimester

38
Q

Limb buds are identified by week

A

Week 7

39
Q

Cystic structure noted within early fetal head

A

Rhombencephalon

40
Q

Rhombencephalon develops into the

A

4th ventricle

41
Q

What is the arrow pointing to

A

Rhombencephalon

42
Q

Physiologic bowel herniation begins at ___ weeks

A

8 weeks

43
Q

Physiologic bowel herniation is typically resolved by week

A

Week 12

44
Q

This is an image of a 11.5 week fetus. What do you suspect the arrow is pointing to?

A

Physiologic bowel herniation

45
Q

Decidua basalis is the

A

Maternal contribution of the placenta

46
Q

Chorion frondosum is

A

The fetal contribution of the placenta

47
Q

Most common anomalies associated with increased NT

A

Trisomy 21,18, Turner syndrome, CHF

48
Q

NT is measured between _____ weeks

A

11 weeks - 13 weeks 6 days

49
Q

NT is measured when he CRL measures ______

A

Between 45-84 mm

50
Q

Abnormal NT measures

A

> 3mm

OBGYN (22 decks)

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