ch 21-22 test Flashcards
Identify the placental type where the chorionic villi attach but do not invade the myometrium.
Accreta
Define a circumvallate placenta.
An abnormally attached placenta with a peripheral raised ring
Scars within the uterus, secondary to previous gynecologic surgery, are called which one of the following?
Synechiae
Select the acquired maternal problem which results in a placenta thickness of less than 2 cm.
preeclampsia
What is the suspected cause of amniotic sheets?
synechiae
What is the delivery of the cord before the fetus?
prolapse
What is the area between the myometrium and the placenta?
retroplacental
What can result in the mimicking of a placenta previa?
overfull bladder
The multiple fibrous strands of amnion that develop in utero and may entangle fetal parts to cause amputations or malformations of the fetus are described as which of the following?
Amniotic bands
Which of the following maternal diseases can result in early placental maturation?
Hypertension
Which of the following is the implantation of the placenta which lies low in the uterus resulting in total or partial covering of the cervix?
placenta previa
Which of the following is the crossing of the internal os by the umbilical cord?
Vasa previa
Which of the following describes the sonographic characteristic of excessive Whartons’s jelly?
Variably echogenic, soft tissue mass with three vessels visible
Which form of placenta previa lies within two centimeters of the internal os?
Low-lying placenta
Mucous tissue surrounding the umbilical cord
wharton jelly
The placenta is responsible for all of the following except:
hormonal
The umbilical cord originates from fusion of the yolk sac stalk and the omphalomesenteric duct at approximately:
7 weeks GA
The normal at term umbilical cord length is approximately:
51.5-61 cm
The normal term placenta weighs between:
480-600 g
A normal placental thickness at 24 weeks gestaton is less than:
4 cm
Placental calcifications may be caused by all of the following except:
lung maturity
A jelly-like placenta is associated with:
IUGR
A placenta is considered low lying if the inferior margin is:
within 2cm of the internal os
The most infiltrative form of placenta accreta is:
increta
Premature separaton of all or part of the placenta from the myometrium is:
placental abruption
A(n) _____________________ bladder can cause a false positive appearance of placenta previa.
over distended
Compressed umbilical cords place the fetus at risk for _____
hypoxia
The most common reason for emergency postpartum hysterectomy is a __
map
The use of color doppler should make the visualization of the umbilical cord insertion into the placenta easily identifiable.
true
An accessory placental lobe is also known as a battledore placenta.
false
Visualization of multiple ______________________ are highly suggestive of placenta accreta.
lacunae
Cord prolapse is defined as:
presentation of the umbilical cord in advance of the fetal presenting part during labor and delivery
