1st Trimester Flashcards
When MSD is 8mm or greater, and no yolk sac is seen, what does this most likely indicate?
Failed early pregnancy
Sonographers using the term gestational age indicates what?
Weeks or days since the FIRST day of the LMP
Once a cervix dilates in early pregnancy, what will occur?
Abortion
When do fetal kidneys develop?
Beginning of the 6th menstrual week
When does the trilaminar embryonic disc form?
During gastrulation - when the ectoderm, mesoderm, and endoderm are formed.
In a ruptured ectopic pregnancy, which section of the fallopian tube is potentially the most life threatening?
Interstitial
The double bleb sign refers to which sonographic presentation?
Amnion and adjacent yolk sac
What is the name of the two procedures for an incompetent cervix?
McDonald procedure and Shirodkar cerclage
What is the term for threatened abortion?
Vaginal bleeding at less than 20 weeks
How much of the endometrial canal should a gestational sac occupy at 8 weeks GA?
Half of the endometrial canal
Before fetal kidneys function, what creates amniotic fluid?
The amnion
What is an incomplete abortion?
Spontaneous abortion with retained products of conception
Is the ovary a common place for ectopic pregnancies?
No
What is a blighted ovum?
An anembryonic pregnancy - a failed pregnancy
When GA sac MSD is greater than 25mm TA or 18mm TV and no embryo is seen
Trophoblastic disease is associated with which conditions?
Pregnancy-induced hypertension, theca-lutein cysts, hyperemesis gravidarum, LGA
What is a theca-lutein cyst?
Theca lutein cysts are rare, benign lesions responsible for gross cystic enlargement of both ovaries during pregnancy.
A patient is 10wks GA but presents with pregnancy-induced hypertension, what is the main suspicison?
Hydatidiform mole
PIH will not usually rear its head until second trimester, and most commonly if it appears in first trimester, it is the hydatidiform mole
What are the clinical findings for pre-eclampsia?
Proteinuria, excessive maternal weight gain (exceeding 2 lbs a week), and generalized edema
CRL begins to lose accuracy after how many GA wks?
11 wks
What is the double decidual ring sign?
Sonographic criterion for determining whether there is a normal gestational sac or just endometrial fluid surrounded by a decidualized endometrium:
Decidua capsularis and decidua parietalis CAPPARI
The chorion basalis is is which side of the placenta?
Maternal side:
motherbase
Chorion frondosum is which side of the placenta?
Fetal side of the forming placenta
sumofpart
Nearly all congenital malformations occur (except genitalia), originate before or during which period?
Embryonic
What is the first system to function in the embryo?
Cardiovascular system
