Shared Flashcard Set

Details

1st Trimester
Diagnostic Medical Sonography
59
Medical
Undergraduate 1
06/06/2011

Additional Medical Flashcards

 


 

Cards

Term
Approx. day 18
Definition
When does the morula enter the uterus?
Term
Approx. day 20-21
Definition
When does blastocyst implant into the endometrium?
Term
  • outer cells - trophoblast, which forms the placenta
  • inner cells - inner cell mass, which becomes the embryo
Definition
What are the two cell types in the blastocyst?
Term
hCG
Definition
The trophoblast cells secrete what hormone?
Term
From week 8 through end of week 12
Definition

When does the midgut herniate into

 umbilical cord?

Term

Embryologic age

The first day of the pregnancy being conception

Definition
Conceptual age
Term

Gestational age

Sonographers use this

The first day of the LMP being the beginning

 of gestation

Definition
Menstrual age
Term
  • Pregnancy test
  • Ultrasound exam

 

Definition
Two most important diagnostic studies of an early pregnancy?
Term
BhCG
Definition
A hormone produced by the placenta and is highly specific for identifying pregnancy
Term
Increase proportionately
Definition
How does gestational sac size and hCG levels relate until 8 week?
Term
1800 mIU/ml or greater
Definition
A normal gestational sac can be visualized transabdominaly with what hCG level?
Term
500 mIU/ml
Definition
Transvaginally a normal gestational sac can be visualized whith a hCG leve of what?
Term
Double decidual sac sign
Definition
The interface between the decidua capsularis and the endometrium forms what?
Term
greater than 3mm
Definition
Decidual wall thickness
Term

When MSD is 10mm and definetly

 by 20mm

Definition
A yolk sac should be visualized with a MSD of what?
Term
When MSD is 18mm and definetly by 25mm
Definition

An embryo should be visualized with a MSD

 of what?

Term

yolk sac

5 1/2 - 6 weeks

Definition
What is the earliest anatomy seen and at how many week?
Term
  • nutrients
  • development of blood cells (hematopoiesis)
  • development of the endoderm that forms the promitive gut
Definition
What does the yolk sac provide?
Term
yolk stalk
Definition
The yolk sac is attached to the embryo by what?
Term
12 weeks
Definition

When does the yolk sac absorb and no

 longer seen?

 

Term
18 weeks
Definition
When does the amnion and chorion fuse?
Term
5 weeks
Definition
Gestational sac is seen when?
Term
5 1/2 weeks
Definition
When is the embryonic heart motion seen?
Term
amniotic caity
Definition
Where is the embryo located?
Term
amnion and chorion
Definition
The yolk sac is located inbetween where?
Term
allantois
Definition
a tubular extension of the endoderm of the yolk sac that extends with the allantoic vessels into the connecting stalk of the embryo. In human embryos, allantoic vessels become the umbilical vessels and the chorionic vill
Term
By 12 weeks
Definition
Normal bowell herniation, the bowel should be within the fetal abdomen by when?
Term
8 to 11 weeks
Definition
After rhombencephalon divdeds the cystic rhomboid fossa is imaged when?
Term
rhombencephalon
Definition
cystic structure seen in the head around 8 to 11 weeks?
Term

35 days

5-5 1/2 weeks

Definition
The embryonic heart starts beating when?
Term
by then end of 8 wks
Definition
when should the heart obtain its adult configuration?
Term

46 days

6-6 1/2 weeks

Definition
heart activity should always be seen by when?
Term
(Length + Width + Height)/3 =MSD
Definition
Mean Sac Diameter formula
Term
MSD + 30 =gest. age(days) /7 = gest. age(weeks)
Definition
Formula for finding gestational age
Term
90%
Definition
Visualization of yolk sac predicts viable pregnancy in what precent?
Term
5.6mm
Definition
The yolk sacs normal diameter should never exceed?
Term
10mm and definetly 20mm
Definition

the yolk sac should be visualized by what

MSD size?

Term
12 wks, when fetus begins to curl
Definition
CRL is used up to what?
Term
at least 3
Definition
How many CRL's should be averaged?
Term
anembryonic pregnancy
Definition
Absence of embryo by 7-8 weeks
Term
CRL + 6 = gest. age (days)
Definition
gestational age formula with CRL
Term
7 to 10 times
Definition
Multiple gestations are how much of a higher mortality rate than singletons?
Term
Dizygotic twins
Definition
  • 2 ova
  • 70% of all twins
  • Dichorionic/Diamniotic
Term

Monozygotic twins

Monochorionic-diamniotic

Definition
  • appear to be contained within one chorionic sac
  • Two amnions, two yolk sacs, two embryos
Term

Monozygotic twins

Monoamniotic-monochorionic

Definition
  • High mortality rate, approx. 50%
  • one sac, one amniotic membrane, one or two yolk sacs, two embryos within one amniotic sac
Term
FSH and LH
Definition
What hormones does the pituitary gland release?
Term
progesterone and a little estrogen
Definition
What does the corpus luteum secrete?
Term
decidual reaction
Definition
The hypertrophic changes are referred to as what?
Term

Week 8

Definition
At what week do the metanephros (kidneys) start ascendubg from the pelvis?
Term
urine
Definition
qualitive
Term
BhCG
Definition
quantitative
Term
1mm per day
Definition
How much does the sac increase per day?
Term
decidua basalis
Definition
villi on the myometrial side
Term
Decidua capsularis
Definition
villi covering the rest of the developing embryo
Term
Fundal and ipsilateral to ovulation side
Definition
normal implantation is where?
Term
16-17 weeks
Definition
amnion and chorion fuse when?
Term
9 weeks
Definition
Cerebral hemispheres should be able to be visualized by when?
Term
Near mothers, 75-80 beats per min
Definition
the heart begins beating at what rate?
Term
8 weeks
Definition
hCG levels plateau and subsequently decline when?
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