OBGYN Flashcards
How to estimate delivery date?
LMP - 3 months + 7 days
DA vs GA
DA = days since fertilization= shorter GA= days since LMP= longer than DA
When does first trimester end? second?
12 weeks DA or 14 wks GA
24 weeks DA or 26 weeks GA
Define lengths: pre- viability: pre-term: early term: full term: late term:
pre- viability: before 24 wks pre-term: 25-37 early term: 37-38.6 full term:39-40.6 late term: 41-41.6 postterm: 42+
When is fetal movement felt?
Whats this called?
starts 16-20 wks GA
quickening
When should anatomy scan be done?
18-20 wks GA
What are the following signs?
Goodell sign
Ladin Sign
Chadwick Sign
Goodell- softened cervix (first)
Ladin- softened uterine midline
Chadwick- blue discoloration vagina/cervix
all first trimester
When is “cholasma” seen? linea nigra?
second trimester ~16 wks; linea also second trimester
Describe BHCG trend?
rises and peaks @ 10 wks
drops during 2nd trimester
rises again 3rd trimester to 20-30k
How often should BHCG double in early pregnancy?
q48 hours for first month
At what BHCG should a gestational sac be seen on scan?
10-15k/ or 5 wks
Cards changes in pregnancy
^HR/CO
lower BP
GI changes in pregnancy
GERD and constipation due to LES decreased tone and decreased colonic motility
Renal changes in pregnancy
increased GFR, decreased BUN/Cr
increased risk pyelo due to uterine compression of GU tract
Heme changes in pregnancy
anemia, hypercoagulable (fibrinogen ^ but no PT/PTT, INR change)
Important prenatal testing done:
- early as possible
- 11-14 wks
- 16 wks
- 15-20 wks:
- 18-20 wks
- early: blood tests, pap, GC
- 11-14: gestational age, nuchal translucency
- 16 wks: fetal heart sounds
- 15-20 wks: triple or quad screen
- 18-20 wks: anatomy scan
Third trimester testing done at
27 wks
24-28 wks
36 wks
27 wks CBC
24-28 GTT
36 wks repeat GC, GBS
When to give iron supplements in pregnancy
Hgb 11 or less
How often are visits early in pregnancy?
3rd trimester?
36?
early- 4-6 wks
3rd trimester- 2-3 weeks
36+- weekly visits w/ cervical cks at each
When is chorionic villus sampling/amniocentesis a reasonable idea and when can it be done?
10-13 wks CVS; 11-14 amnio
advanced maternal age
known genetic disease in parent
MC location ectopic pregnancy
ampulla of fallopian tube
How to manage ectopic?
ruptured: stabilized –> surgery
not ruptured: medical or surgical treatment
Medication used to abort ectopic?
MTX (folate receptor antagonist)
Important followup for MTX treatment of ectopic?
follow BHCG to zero
Exclusion criteria
large or heart beat
liver disease
noncompliant
immune deficient
surg for ectopic
salpingostomy/ectomy
*need rhogam if Rh negative
SAB is inevitable when?
bleeding + dilated cervix
Abortion is before what GA?
MCC?
20 wks
(80% in first 12)
chromosomal abnl
Threatened abortion def
bleeding without dilation
Missed abortion def
abortion but all POC in uterus
Treatment of septic abortion
D&C + IV levo or metro
Difference between preterm labor and cervical incompetence?
contractions
Contraindication to tocolytics in preterm labor?
BP ^ cardiac disease dilated more than 4 DIC fetal death chorio
At what GA is preterm labor not stopped?
34-37
earlier give steroids and tocolytics
MC used tocolytic
magnesium sulfate… can also use CCB or terbutaline
Define PROM + risks
ruptured more than 24 hours before delivery
= PTL, cord prolapse, abruption, chorio
Management of PROM
chorio- always deliver
term- wait 6-12 hours for spontaneous this induce
preterm- abx, steroids, tocolytics,
Abx used in PROM
azithro 1 g and ampicillin
What is CI in all cases of third trimester bleeding?
digital exam
Presentation placenta previa
painless bleeding
Three types of placental invasion
accreta, increta, percreta
Risk assc with placental invasion
PPH (type and cross)
Treatment of bleeding assc with placenta accreta
hysterectomy
Define placental abruption
Separation of the placenta from the uterus
Risk factors for abruption
smoking, cocaine, HTN, trauma, prior hx