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
How is PPROM managed at 34-37 weeks?
Preterm Premature ROM
- Antibiotics
- +/- Corticosteroids
- Delivery
What is PPROM?
Preterm Premature ROM, so <37 weeks
How is PPROM managed <34 weeks
- Antibiotics (Intrapartum Penicillin for GBS status unknown)
- Corticosteroids
If signs of infection: Delivery + Mag if <32 weeks
No infection: Fetal surveillance
When is amnioinfusion appropriate?
Refers to saline instillation into uterine cavity. Done for tx of recurrent variable decels due to umbilical cord compression during labor
most common cause of postpartum hemorrhage <24 hours after delivery
Uterine atony (myometrial contractions important for compression of placental vessels aka hemostasis)
risk factors for uterine atony (which leads to PPH)
- prolonged labor
- over distention (fetal wt >4000g, multiple gest), polyhydramnios
- chorioamnionitis
- unresponsive to pit
- forcep/vacuum delivery
- htn disorders
clinical indications of uterine atony
soft (Boggy) and enlarged (above the umbilicus)
Post partum ultrasound shows a thin endometrial stripe. What does this mean?
Suggests and empty and normal uterine cavity, making retained placenta etc unlikely
Definition of PPH
Post partum hemorrhage:
>500mL after vaginal delivery
>1000mL after c/s
Uterotonic agents that can be used to tx PPH/uterine atony
- Oxytocin is 1st line
- Methylergonivine: smooth m contraction, vasoconstrict
- Carboprost: synthetic PG, c/i in asthma b/c bronchoconstrictor
Uterine massage –> Methylergonivine –> Oxytocin
T/F: Placenta previa is a c/i to vaginal delivery
True (only if covering/<2cm from cervical os)
How can you use fetal fibronectin levels to predict preterm delivery?
Levels are high til 20 weeks and low in 2nd/3rd tri and increase at term. Elevated levels just prior to term = increased risk.
T/F: Patients with prior cervical surgery at increased risk of preterm delivery
True, i.e conization.
- ->Gold Standard test: TransVAGINAL US to measure cervical length
- ->Progesterone therapy maintains uterine quiesence w
pregnant patient comes in with hypertension. Whats the cutoff for primary vs gestational? (week)
20 weeks. Prior to this its primary htn.
Fetal risks due to maternal htn
Preterm delivery, oligo, growth restriction
maternal risks due to maternal htn
PreE, PPH, GDM, Placental abruption, C/s
how does placental abruption present?
sudden onset vaginal bleeding + tender uterus. also, high frequency, low intensity contractions. It is due to premature placental detachment.
who gets placental abruption?
smoker/cocaine use, maternal PreE/htn, abdominal trauma
maternal complications of placental abruption
hypovolemic shock and DIC.
Tx of PreE
Mag Sulfate
Tx of PreE
Mag Sulfate + delivery
Chronic pelvic pain, urinary urgency, painful sex in a female
Interstitial cystitis
Sxs and risk factors for vesicovaginal fistula
occurs after pelvic surgery, get painless continous urine leakage from vagina (clear fluid). dont be thrown, the UA may show + cystitis
Dx: dye test and cystourethroscopy
1st line anti-htn meds in pregnancy
-Methyldopa!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- Beta blockers (labetolol)
- Hydralazine
- CCB (nifedipine)
anti-htn meds CI in pregnancy
ACE-I
ARB
Furosemide
Spironolactone
T/F: Trisomy 18 and 21 both have increased hCG and decreased AFP
False. 21 has increased hCG, 18 has decreased. in addition, 21 has increased Inhibin A
T/F: Needle aspiration of an adnexal mass in postmenopausal women is CI
True, risk of seeding malignant cells. Do CA-125 levels
Pruritis, elevated bile acids and ALT/AST in pregnancy
Intrahepatic cholestasis of pregnancy (ICP)
–>Ursodeoxycholic acid helps increase bile flow, early delivery once term is recommended
Ischemic pituitary necrosis after pregnancy
Sheehans: fatigue, wt loss, hypotension, poor breast feeding
clinical features of HELLP
PreE, N/V, RUQ pain
Tx of HELLP
Delivery, Mag Sulfate for seizure prophy, anti-htn
Dx workup for endometriosis
Laparoscopy
Pelvic pain + thickened uterosacral ligament
Endometriosis
T/F: Big future risk with endometriosis is osteoporosis
False, Infertility
Dx of chorioamnionitis
Clinical. Fever + 1 of the following:
- uterine tenderness
- maternal, fetal tachycardia
- purulent vaginal discharge
- malodorous amniotic fluid
What is a reactive nonstress test?
at least 2 accelerations in 20 minutes lasting 15 seconds (HR is increasing with movement)
What is a non-reactive nonstress test?
No accelerations, typically indicating fetal hypoxia from 1. placental insufficiency or 2. fetal anomaly (cardiac/neuro).
–>but, most common cause is fetal sleep cycle. So NST should be >40 minutes if nonreactive.
Endometrial glands in the myometrium, causing dysmenorrhea and heavy menses
Adenomyosis
Symmetrically enlarged uterus that feels boggy, tender, globular + dysmenorrhea
Adenomyosis
most effective emergency contraception
Copper IUD, can be inserted up to 5 days later. CI = acute cervicitis and PID
risk factors for placental insufficency ( 0-4/10 on BPP)
tobacco, htn, diabetes, AMA
Toxicity of oxytocin
(its similar to ADH) water retention, hyponatremia and thus seizures
Fetal hydantoin syndrome (phenytoin)
small body size, microcephaly, digital hypoplasia, cleft palate (this feature is not part of FAS)
T/F: All pregnant women are screened for GDM
True, this happens at 24-28 weeks
Target blood glucose levels for GDM patients
<95, 1 hour post prandial <140
How do you manage a delivery with shoulder dystocia? The head is out but shoulders not passing
Flex moms hips against the abdomen (McRoberts manuever) .
Breathe, dont push Elevate hips (mcroberts) Call for help Apply suprapubic pressure Largen opening with episiotomy Manuevers
obesity causes amennorhea due to:
anovulation
What are the LH and FSH levels in anovulation?
Normal, as is estrogen. Have low progesterone, so no progesterone withdrawal menses
What lab values would be abnormal in premature ovarian failure?
Elevated LH and FSH
what is lochia
vaginal bloody/mucus discharge up to 6-8 weeks post partum
Next step if suspecting lichen sclerosis (atrophy, pruritis, white patches)
vulvar punch biopsy
Tx for atrophic vaginitis (dryness, thinning) and lichen sclerosis (same + pruritis, white patches)
AV: Low dose topical estrogen
LS: High dose corticosteroids (clobetasol)
which vaccines do you give in pregnancy?
Tdap
Inactivated Influenza
Rho Immunoglobulin
some contraindications to external cephalic version
uterine/fetal anomaly multiple gestation oligo ruptured mem extended fetal head
complications of cervical conization (for CIN 2, 3)
Cervical stenosis
Preterm birth, PPROM
2nd tri preg loss
gold standard for dx CIN
Colposcopy
how is dx of ectopic preg made?
Pregnancy test + transvaginal US
transabdominal will show no uterine preg
Patient presents with inevitable abortion at 10 weeks. Tx?
Hemo stable: Misoprostol
Hemo unstable: Suction curettage
Needs Rhogam also
Patient presents with ruptured ectopic. Tx?
Hemo stable: Methotrexate
Hemo unstable: Surgery (laparosopy)
(note: NOT a D/C…this is for spontaneous/inevitable abortion)
vaccines contraindicated in pregnancy
MMR
Varicella
HPV
Live attenuated influenza
vaccines safe in pregnancy
Tdap
Inactivated influenza
Rhogam
what labs are ordered during 2nd trimester visit (24-28weeks)?
- Oral glucose challenge test for GDM screen (50g 1 hr)
- Antibody screen if Rh-
- Hgb/HCT
what labs are ordered during 3rd trimester visit (35-37 weeks)?
GBS culture
what labs are ordered during initial prenatal visit?
- Rh type, antibody screen
- Hgb/HCT/MCV
- HIV, VDLR/RPR, HbsAG
- Rubella and varicella titers
- Pap test (if screening indicated)
- Chlamydia PCR (note: GC only in high risk)
- Urine culture
- Urine protein (note: not a 24-hour protein)
When is exercise contraindicated for a pregnant patient?
- multiple gestation
- cervical incompetence
- premature labor
- placenta previa/abruption
- PreE/gHTN
- amniotic fluid leak
otherwise, ok to exercise
sinusoidal fetal heart rate tracing (smooth undulating sign wave)
Fetal anemia
Hypoglycemia and fetal sleep give what type of FHR?
Nonreactive NST (no accelerations)
Types of abortions in which the cervical os is closed
Missed (no bleeding or cardiac), Threatened (bleeding and cardiac activity), Complete (bleeding or none)
Types of abortions in which there is no bleeding
Missed, possibly Complete
Types of abortions with dilated cervical os
Inevitable, Incomplete
serial beta-hcg levels increase until:
end of first trimester
US findings in a missed abortion (<20 weeks)
- embryo without cardiac activity
- or empty gestational sac without a fetal pole (would first repeat in a week to see if any change)