WH Flashcards
What is an appropriate measure of FHR variability from baseline?
6-25 bpm
Normal baseline FHR?
110 - 160 bpm
What are some things that can cause minimal/absent variability in FHR?
Acidemia Fetal sleep Fetal tachycardia Meds (narcotics, anesthesia) Prematurity Cardiac arrhythmias Pre-existing neuro injury
Define an accel of FHR.
How frequently should these occur?
Rise over baseline of 15+ bpm for at least 15 seconds.
At least two should occur over 20 minute span.
Define recurrent late decels
Occur with 50%+ of contractions
Fetal decels that mirror the timing of maternal contractions are likely from what cause?
Fetal head compression - these are “early” decels and benign
VEAL CHOP: early = head
Decels that occur without contraction are likely from what cause?
Cord compression - these are “variable” decels
VEAL CHOP: variable = cord
Decels that are gradual, lasting 30 seconds to 2 minutes, with the nadir after the peak of contractions are likely from what cause?
Placental insufficiency - these are “late” decels and are a concerning finding
When is the fetal yolk sac usually visible?
From week 5 until ~week 10-12
When is fetal cardiac activity detectable?
Around week 6
When do weekly prenatal visits begin?
Week 36
When do bimonthly prenatal visits begin?
32 weeks, until 36 when weekly visits begin
When is a GBS swab collected in pregnancy?
37 weeks
When is TDAP offered to a pregnant patient?
28 weeks
When is a GTT performed on a pregnant patient?
28 weeks
Associate types of twinning with timing of embryonic cleavage
Early (days 1-3) = di/di
Mid (days 4-8) = mo/di
Late (days 8-13) = mo/mo
Very late (days 13/15) = conjoined
