OB Flashcards
Name 9 conditions all associated with breech presentation
1) prematurity; 2) multip gest; 3) genetic disorders; 4) polyhydramnios; 5) hydrocephaly; 6) anencephaly; 7) placenta previa; 8) uterine anomalies; 9) uterine fibroids
Name 6 conditions associated with increased incidence of shoulder dystocia
1) fetal macrosomia; 2) maternal obesity; 3) DM; 4) postterm pregnancy; 5) prior should dystocia delivery; 6) prolonged second stage of labor
What qualifies as prolonged 2nd stage?
gt 3 hours (nulli)
gt 2 hours (multi)
What qualifies as prolonged latent phase?
gt 20 hrs (nulli)
gt 14 hrs (multi)
What qualifies as prolonged active phase?
slower than 1.5 cm/hr (nulli)
slower than 1.2 cm/hr (multi)
What qualifies as arrest of active phase
4 hrs of adequate ctx (200 mV in 10 mins)
or
6 hrs of all type
What is the most common type of breech (and the next two?)
Frank breech then footling, then complete
When is the fetus at greatest teratogenic risk?
Weeks 3-8
There is no increase seen in fetal anomalies or pregnancy losses with ionizing radiation exposure less than ___. Fetus is at greatest risk of exposure brown __ and __ weeks
5 rads; 8-15 weeks
Smoking increases the risk of these 5 serious complications
1) placental abruption; 2) placenta previa; 3) fetal growth; 4) preeclampsia; 5) infxn
Name 5 tocolytics
1) nifedipine; 2) terbutaline; 3) ritodrine; 4) magnesium sulfate; 5) indomethacin
Which two tocolytics are contraindicated in diabetic pts? Which one in myasthenia gravis?
terbutaline and ritodrine (terbutaline is no longer used to stop preterm labor in anyone); magnesium sulfate
___ (a tocolytic) is contraindicated at 33 weeks due to risk of premature __ closure.
Indomethacin; ductus arteriosus (also associated with oligohydramnios)
How does magnesium sulfate work as a tocolytic? Beta adrenergic agents? CCB? NSAIDs?
by competing with calcium entry into cells; increasing cAMP thereby decreasing free calcium; CCBs prevent calcium entry into muscle cells by inhibiting ca transport; NSAIDs block PG production
Name 3 side effects of magnesium sulfate and the order in which they appear. What is the antidote?
1) loss of DTR; 2) respiratory depression (12-15mg/dl); 3) cardiac depression (gt 15mg/dl)
calcium
Name 2 bad side effect associated with nifedipine.
fetal hypoxia and decreased uteroplacental blood flow
In addition to increasing pulmonary maturity and reducing the incidence of RDS in the newborn, betamethasone from 24-34 wks has been associated with a decrease in __ and __.
intracerebral hemorrhage; necrotizing enterocolitis
___ is an extracellular matrix protein that acts as an adhesive btwn the fetal membranes and the underlying decidua. Its presence in the cervical mucus btwn __ and __ weeks is thought to indicate a disruption to the __. It has a strong positive/negative predictive value only
fibronectin; 22-34 (it is normally found in cervical secretions in first half of preg); maternal-fetal interface; negative (if you have negative you have a 99/100 chance of not delivering in the next 14 days)
During delivery a fibrinogen is checked; what do you expect to see
fibrinogen should go up
if a pregnant woman is hypotensive, what is the first thing you do?
turn her on her left side (ivc compression)
what happens to a pregnant woman in regard to clotting?
clotting increases
what pulmonary function test gets worse (decreases) in pregnancy?
FRC
what is the expected change in hemoglobin in pregnancy?
blood volume increases but hgb (concentration) falls; normal is to nadir at 10
what happens to the tidal volume in pregnancy?
increases
what is the expected change in creatinine in pregnancy?
goes down
How do you treat GERD in a pregnant woman?
PPI
prior to pregnancy what vaccines should mom receive? What vaccine can mom NOT get once pregnant?
influenza, hep B, MMRV; MMRV
What vitamin should a woman who wants to get pregnant be on?
folic acid
Mom has HTN and wants to get pregnant. What do you put her on?
alpha methyl dopa (hydralazine, labetalol, nifedipine)
Mom is Rh-antigen positive, what do you put her on?
nothing
Pt has diabetes and wants to get pregnant, what do you do?
switch to insulin
What are the followup periods for pregnancy?
q4w until 28 wks, q2w until 36 wks, q1w until delivery
What is the quad screen for down syndrome?
increased: bHCG, inhibin
decreased: AFP, estriol
What is sequential screening?
1st then 2nd trimester screens - more unnecessary testing, more abortion advantage
What is combine screening?
1st and 2nd trimester screens at once - less unnecessary testing, less room for intervention
Nuchal translucency screen - when and for what?
1st tri screening for aneuploidy and spina bifida
What age is considered increased risk for aneuploidy? (AMA age)
35
Rh ? mom, Rh+ baby, Rh Ab-, what do you do?
Rhogam at 28 wks and w/in 72 hrs from delivery
How do you screen for gestational diabetes?
1 hr glucose tolerance test - 50g, sugar should be less than 140
For 3hr glucose tolerance test, what are the four glucose levels to look for?
give 100g; fasting gt 95 1 hr gt 180 2hr gt 155 3hr gt 140 (need 2/4 to be positive)
What constitutes anemia in a pregnant woman?
hgb lt 10; hct lt 30
Rh ? mom, Rh + baby, what do you do?
check mom for antibodies
How do you test to confirm a pregnancy?
ultrasound
How do you treat fetal anemia?
PUBS and transfuse (PUBS = percutaneous umbilical cord sampling)
When do you get an amniocentesis? What can it show? What is the risk of loss?
16-20 wks; AFP, genetics, fetal lung maturity, assess for infxn; 0.5%
How do you screen for fetal anemia? How do you confirm?
transcranial doppler (highly sensitive); PUBS
When do you perform chorionic villous sampling? What can it show? What is the risk of loss?
10-13 wks; genetics, karyotyping; 1-3%
Which is more invasive, CVS or amniocentesis?
CVS
What medication can you use in pregnancy for hyperthyroid?
PTU
A pregnant woman has n/v so bad that she has electrolyte abnormalities, next step?
IV hydration (THEN work it up)
A woman gets pregnant and has hypothyroid, what do you do with her synthroid?
increase it (thyroid binding proteins are increasing) - trend TSH q4wks (instead of q12)
Who do you tx when you find a positive UTI without symptoms?
pregnant women only
Cystitis in pregnant woman, what do you give?
amoxicillin (nitrofurantoin if penicillin allergic) x 7d (complicated UTI!)
How do you diagnose diabetes BEFORE she gets pregnant?
A1c or 2 hr glucose tolerance test
Who do you screen with urinalysis?
pregnant women!
The thyroid has to come out. When is it safe for thyroidectomy?
2nd trimester
How do you tx pyelonephritis in a pregnant woman?
ceftriaxone - if no improvement after 3 days, U/S looking for abscess
Pregnant pt with epilepsy - what can you give to prevent seizures? What can you give to abort seizures?
levetiracetam or lamotrigine; phenobarbital or benzos (ok in late pregnancy)
folate for all women on AEDs looking to get pregnant!
Latent phase of pregnancy is __ to __ and should take no longer than __ (nulli) or __ (multi)
0cm to 6cm; 20 hrs; 14 hrs
Active phase of pregnancy is __ to __ and should take no longer than __ (nulli) or __ (multi), __ (max)
6cm to 10cm; 1.2cm/hr; 1.5 cm/hr; 5hrs
What is the beginning and end of stage 1 of labor
0cm w/contractions to 10 cm max dilation
What defines stage II of labor? How long should it take?
delivery of fetus - from max dilation 10 cm to fetus out; 3 hrs (nulli) or 2hrs (multi); add one hour for epidural
Breech birth + external version fails, whats next?
C section
Define stage III of labor. How long should it take?
delivery of placenta, from fetus out to placenta out; less than 30 minutes
Fetal station is the number of centimeters from the __
ischial spine
We can simulate head engagement with?
cervical ripening balloon (CRB)
If prolonged latent phase, how can you tx?
augmentation of labor (balloon, oxytocin, misoprostol, amniotomy)
Mom has been pushing for 3 hrs since maximum dilation, baby is still at station -1, next step?
assess for progress/descent of fetal head - if not progressing offer cesarean (this is how to tx prolonged 2nd stage with negative station)
Baby’s head can be seen just at the vaginal opening, but it’s been going for 4 hours (maternal exhaustion). Next step?
vacuum or forceps (this is how to tx prolonged 2nd stage with positive station)
Define arrest of active phase. How do you tx?
4hrs of adequate ctx (gt 200 mV) or 6 hrs all comer. If decreased frequency or adequacy, oxytocin; everything else: C/S
What is considered adequate frequency of contractions in labor?
3 ctx in 10 mins = good; less than 3 in 30 mins is bad (this tells you nothing about the power of the ctx)
What are the 3 ways to tx prolonged stage 3 of labor?
1st: uterine massage; 2nd: oxytocin; 3rd: manual extraction
Mom has a fever after delivering baby 6 hrs ago, placenta out came 5.5 hours ago, diagnosis and next step?
endometritis - antibiotics (gentamicin + ampicillin)