OB Flashcards
A patient is 28 weeks pregnant and is rubella non-immune. How is this handled?
Wait til post-partum period for immunization since MMR is a Live vaccine!
When is Anti-D immunoglobulin given?
Indications for Rh(D)neg patients:
- between 28-32 weeks
- <72 hours after delivery Rh+ infant
- <72 hrs after SAB
- ectopic pregnancy
- threatened abortion
- hydatidiform mole
- CVS/Amniocentesis
- abdominal trauma
- 2nd/3rd trimester bleeding
- external cephalic version
what is done in the type and antibody screen?
Check blood type: A, B, AB, O Rh(D) status: + or - RBC antibodies (alloimminuzed or not)
When do you test for GBS?
rectovaginal swab at 35-37 weeks b/c results valid for 5 weeks. Can become colonized at any time, so earlier results would not be valid
T/F: Pregnant women should undergo screening with urine culture and tx of symptomatic bacteriuria only in the first trimester
F: Should undergo screening and tx of even asymptomatic bacteruria in 1st trimester b/c risk of pyelo
what are the components of a BPP (biophysical profile)?
- NONSTRESS TEST (reactive hr)
US:
- amniotic fluid volume
- fetal movements ( >3 gen body movements)
- fetal tone ( >1 ep flexion/extension)
- fetal breathing movements (>1 breathing ep >30 sec)
total scored 0-10; 2 = normal for each, minimum 30 minutes test
scoring indications for BPP
8-10: Normal
6: equivocal
<4: INDICATION FOR DELIVERY to prevent intrauterine demise
Late term (41 weeks) and post-term (42) pregnancies are at risk of _________ _________
Uteroplacental insufficiency
What risks come with uteroplacental insufficiency?
- Compression of uterine vessels during contractions cause hypoxia = reflex fetal bradycardia = late decels
- poor fetal perfusion = poor urine production = oligohydramnios
Fetal tachycardia, maternal fever and uterine tenderness
intra-amniotic infection (chorioamnionitis)
T/F: Nuchal cords are rare and cause for immediate delivery
False. Common finding on US and delivery, and can resolve before delivery. Associated with variable decels but not with adverse fetal outcomes.
(cord becomes wrapped around fetal neck)
When is betamethasone used?
Decrease respiratory distress syndrome in preterm infants. Admin @ <37 weeks for high risk patients
T/F: Intrapartum penicillin is most effective for GBS prophylaxis if admin prior to labor
False. Bacteria regrows rapidly during labor
What is indomethacin used for in pregnant patients?
Tocolysis. Indomethacin is contraindicated after 32 weeks due to risks of PDA closure. Tocolysis is not done after 34 weeks.
Mag sulfate is admin for ____ _____ at <32 weeks
fetal neuroprotection
How can you monitor for adequacy of contractions during labor?
Intrauterine tocometer (after membranes ruptured). 200 Montevideo units in a 10 minute period.
Why is shoulder dystocia an emergency?
risk for neonatal brachial plexus injury, clavicular and humeral fracture, and possibly hypoxic brain injury and death
Biggest risk factor for shoulder dystocia
fetal macrosomia –> maternal obesity, GDM, post-term pregnancy, excessive wt gain during preg
warning signs of an impending shoulder dystocia
prolonged first and second stage of labor, and retraction of the head into perineum after delivery (turtle sign)
What is stage 1 of labor?
0cm - 10cm.
Latent: 0-6cm. <20 hours (np), <14 hours (mp)
Active: 6-10cm
What is stage 2 of labor?
10cm - fetus delivery. <3 hours (np), <2 hours (mp)
What is stage 3 of labor?
fetus delivery - delivery of placenta. <30 minutes
What allows cervical dilation?
Breakage of disulfide bonds. Stimulated by fetal head engagement
Shortening/thinning/ripening of the cervical canal
effacement