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OB > Lecture 4A > Flashcards

Lecture 4A Flashcards

1
Q

When is first trimester assesment

A

0-13 weeks

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2
Q

if first scan the first trimester assessment is called

A

Dating US

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3
Q

What is done for first trimester assessment (3)

A

Assess gestational sac
asses embryo
Assess maternal structures

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4
Q

Patient prep for first trimester assessment

A

No fasting
Full bladder for tranabdo
Empty bladder transvag

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5
Q

Patient history questions fo first trimester assessment

A 
LMP 
Positive pregnancy test?
Gravidity, Parity, Abortus
Is patient having pain or bleeding 
Patient on meds?
Previous c section?
Any complications?
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6
Q

Order that embryonic structures become appearant

A

Decidual rxn
Gestational sac
Yolk sac
Embryo

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7
Q

When does decidual rxn occure

A

Implantation occurs day 20-23

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8
Q

Size of conceptus at decidual rxn

A

0.1mm, not visible

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9
Q

What is first reliable sign of intrauterine pregnancy

A

Gestational sac

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10
Q

What is gestational sac also called

A

Chorionic cavity

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11
Q

When is the GS visible

A

4.5-5 weeks

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12
Q

Where is the GS seen within

A

Decidua

Known as intradecidual sac sign (IDSS)

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13
Q

What must we differentiate GS from

A

Pseudogestational sac

Decidual cysts

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14
Q

Pseudogestational sac is what

A

Small amount of fluid within the endometrial cavity between the endometrial layers

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15
Q

Decidual cysts are what

A

Small cysts that can form within the decidual reaction

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16
Q

Characteristics of true GS

A 
Round or oval 
Eccentric 
Directly adjacent t endometrial lining 
Will develio a yolk sac and embryo 
Will develop a double decidual sac sign
17
Q

what can a double decidual sac sign confirm

A

Intrauterine pregnancy

18
Q

What is DDSS seen as

A

2 concentric rings surrounding gestational sac

19
Q

What does the GS consist of (2)

A

Decidua parietalis and decidua capsularis

20
Q

What can the DDSS differentiate

A

Abembryonic pole and embryonic poke

21
Q

Mean sac diameter is

A

The common mode of measurement, averages 3 perpendicular planes

MSD= (L+W+H)/3

22
Q

GS is measure wher on the walls

A

Inner to inner

23
Q

Mean sac diameter is used to calculate

A

Calculat gestational age (GA) at 5-10 weeks

24
Q

How old is GA is MSD is 2mm

A

4 TO 4.5 weeks

25
Q

When does the yolk sac appear

A

5.5 weeks

26
Q

What happens at 6 weeks

A

Embryo appears adjacent

27
Q

If GS is larger than 8mm without a yolk sac or larger than 16mm without embryo then it may be a sign of

A

Early pregnancy failure

28
Q

Where is the yolk sac seen

A

Within the GS before the embryo

29
Q

Yolk sac must be seen latest at MSD of

A

20mm

30
Q

Visualization of YS helps confirm

A

True gestational sac

OB (23 decks)

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