Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Term 2 > OB (Early 1st Trimester Sono Appearance) > Flashcards

OB (Early 1st Trimester Sono Appearance) Flashcards

1
Q

What weeks is the 1st trimester?

A

0-13 weeks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What do we scan in the 1st trimester assessment?

A

Gestational Sac:

  • presence (confirm IUP)
  • #
  • size (gestational age)

Embryo:

  • size (gestational age)
  • cardiac activity

Maternal Structures:

  • uterus, cervix, ovaries and adnexa
  • fibroids, cysts, ectopic pregnancies, molar pregnancies, etc.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Patient Prep.

A
  • no fasting
  • full badder (transabdo)
  • empty bladder (transvag)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Questions to Ask

A
  • positive pregnancy test
  • LMP
  • gravidity, parity, abortus
  • pain or bleeding
  • medications
  • previous C section
  • complications with previous pregnancies
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What order do embryonic structures become visible?

A

1) decimal reaction
2) gestational sac
3) yolk sac
4) embryo

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What days does implantation occur?

A

-20 to 23

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How big is the conceptus at the end of implantation?

A
  • 0.1mm

- not visible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the 1st reliable sign of an intrauterine pregnancy?

A

-gestational sac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

When is the visible gestational sac visible?

A
  • 4.5 to 5 weeks

- once the mean sac diameter reaches 2 to 3 mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is the gestational sac seen?

A
  • within decide

- intradecidual sac sign (IDSS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What must we differentiate the GS from?

A
  • pseudogestational sac

- decidual cysts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Pseudogestational Sac

A
  • sm amount of fluid in endometrial cavity

- between endometrial layers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Decidual Cysts

A

-sm cysts that can form within decimal reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A true gestational sac will be…

A
  • round/oval
  • eccentric
  • directly adjacent to endometrial lining
  • develop a yolk sac and embryo
  • develops a double decidual sac sign
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Double Decidual Sac Sign (DDSS)

A
  • confirms intrauterine pregnancy
  • 2 concentric rings surrounding gestational sac
  • consists of decide parietals and decide capsularis
  • can differentiate abevbryonic pole and embryonic pole (site of future placental development)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Mean Sac Diameter (MSD)

A
  • common mode of measurement
  • 3 perpendicular planes
  • inner to inner (only fluid/anechoic part)

MSD= (L+W+H)/3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What weeks can MSD be used?

A

-5 to 10

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How much does the gestational sac grow a day?

A

-1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How many weeks if the MSD is 2mm?

A

-GA= 4 to 4.5 weeks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How many weeks if the MSK is 5mm?

A

-GA= 5 weeks

21
Q

What appears at 5.5 weeks?

A

-YS

22
Q

What appears at 6 weeks?

A

-embryo adjacent to YS

23
Q

Yolk sac is resent is MSD = ___mm.

A

8 (TV)

24
Q

Embryo is present is MSD = ___mm.

A

16 (TV)

25
Q

What does visualization of YS help to confirm?

A

-true GS

26
Q

How do we measure the YS?

A

-inner to inner (usually circular)

27
Q

How big is the YS when we 1st image?

A

-2.3mm (+1mm/day)

28
Q

What is the max diameter of the YS?

A

-5.6mm (10 weeks)

29
Q

What is associated with a lg YS?

A

-pathologies

30
Q

Functions of YS?

A
  • nutrients to embryo
  • vitelline duct (arteries and veins) connect YS to embryo
  • produces albumin, alphafetoprotein (AFP) and other proteins
  • embryonic hematopoiesis (formation of blood cells)
31
Q

Where does hematopoesis continue to in the 8th week?

A
  • liver
  • spleen
  • bone marrow
  • lymph nodes
32
Q

Why does the YS stop functioning?

A

-when the placenta takes over

33
Q

What week is the embryo/fetal pole?

A

-6 to 10

34
Q

Where does the embryo appear at week 6?

A
  • adjacent to YS

- appears as focal thickening

35
Q

Embryo is present is MSD = ___mm. (TA)

A

16

36
Q

Embryo is present if MSD = ___mm. (TA)

A

25

37
Q

How many mm is the embryo when 1st visualized?

A

-2 to 4 mm

38
Q

Crown-Rump Measurement (CRL)

A
  • main measurement used in 1st trimester
  • most accurate estimate of GA
  • correlated with OB charts for GA
  • can be seen at 7 to 8 weeks
  • do not include YS or extremities
39
Q

What measurements are done in 2nd trimester?

A
  • BPD
  • HC
  • AC
  • FL

**less accurate than CRL (1st trimester)

40
Q

When can the embryo’s limb buds be seen?

A

-8 to 9 weeks

41
Q

When can we see the embryo moving?

A

-9 to 10 weeks

42
Q

What is the 1st organ to function in the embryo?

A
  • primitive (tubular) heart

- 5 weeks (36 to 37 days)

43
Q

When can cardiac activity been seen on an embryo?

A

> 5mm (TV)

44
Q

Cardiac activity must been seen if fetal pole = ___mm.

A

7

45
Q

Double Bleb Sign

A

-appearance of amniotic sac, YS and embryo between them

46
Q

Umbilical Cord

A
  • can been seen @ end of 6th week (CRL= 4mm)
  • 2 umbilical arteries
  • 1 umbilical vein
  • the allantois
47
Q

Which trimester is the umbilical cord better seen in?

A

-2nd

48
Q

Allantois (2)

A
  • closely associated with umbilical cord
  • part of connecting stalk
  • contains liquid waste early in pregnancy
49
Q

Vitelline Duct

A
  • closely associated with umbilical cord (not within cord)
  • aka omphalomeseneric duct
  • aka yolk stalk

Term 2 (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions