Ch 2 Intro Flashcards
What questions should we ask our pt before scanning?
-LMP
-Pain, bleeding, previous pregnancies, surgical procedures or pregnancy complications (such as preterm labour + cervical cerclage)
-Is there a positive pregnancy test
How much water must the pt drink for a TA 2nd + 3rd trimester exam?
2nd: 32oz water 1 hr before
3rd: 24oz water 1 hr before
How much water must the pt drink for an EV?
None, empty bladder
List reasons for a 2nd trimester exam?
-confirm IUP
-detailed anatomical assessment
-determine cause of vag bleeding/pain
-estimate gest age (usually growth exams tho)
-evaluate for multiple gestation
-confirm viability
-unable to hear FHR/decreased fetal movements
What is “viability” referring to?
If the baby can make it to term + be born (not simply if the baby is dead or alive)
List reasons for a 3rd trimester exam?
-evaluate growth
-decreased/increased SFH
-polyhydramnios
-follow up on previous abnormalities seen
-evaluate fetal position
-evaluate cervix length
-unable to hear FHR (very concerning in this tri)
-decreased fetal movements (very common reason for u/s)
Which TA probes are used?
-High frequency curvilinear probe is best
-Lower frequency 2.5 MHz sector probe on larger pt’s can be used
What structure are EV exams good at evaluating?
Cervix
Downside to higher frequency EV probes?
6-12MHz or more may not see fundus on larger uteruses
Why would a transperineal exam be done?
When EV can’t be done to evaluate the cervix due to infection, pt refusal, etc.
What 2 structures are transperineal exams good at visualizing?
-Lower uterine segment
-Cervix
Where should the focal zone be placed?
At or slightly below region of interest on image
What does a nuchal fold measure?
Thickness of skin behind the head (whereas nuchal translucency measures fluid)
How many measurements must we take for a BPD, HC, etc?
Min 2, do a 3rd if first two measurements are greater than 2-3cm within each other
Can we tell the pt the gender of the baby?
Nope!
