MedEd Videos Flashcards
Physiology of pregnancy:
what happens to:
1) MAP
2) SVR
3) HR
4) SV
5) DL CO2
6) Hgb
1) MAP –> DECREASE
2) SVR –> DECREASE
3) HR –> 15% increase
4) SV –> INCREASE PRELOAD, no change in contractility
5) DL CO2 –> INCREASE (more RBCs)
6) Hgb –> increase RBCs, but BIG INCREASE in PLASMA (overall decrease in Hgb)
MAP = CO x SVR CO = HR x SV SV = preload and contractility DLCO2 = CO x Hgb x %SaO2 Hgb = [RBC]/[Plasma]
Physiology of pregnancy:
what happens to:
1) Minute Ventilation
2) FEV1
3) PaO2
4) FRC
1) Minute Ventilation –> INCREASE Tidal Volume = increase MV (no change in RR)
2) FEV1 –> no change
3) PaO2 –> no change
4) FRC –> DECREASE
Minute ventilation = TV x RR
Physiology of pregnancy:
what factors are increased in the clotting cascade? decreased?
1) increase vWF
2) Increase factor 7, 8, 10
3) increase inhibitors of tPA
4) decrease in protein C and S
OVERALL INCREASE IN CLOTTING
Physiology of pregnancy:
what is a normal Cr?
what can happen because of significantly increased GFR during pregnancy?
Cr = 0.4-0.8
Significantly increased GFR –> obstructive uropathy at pelvic rim
What is normal weight gain during pregnancy?
1) BMI < 18.5 –> 1 lb/wk = 28-40 lbs
2) BMI 18.5-25 –> 0.75 lb/wk = 25-35 lbs
3) BMI 25-30 –> 0.5 lb/wk = 15-25 lbs
4) BMI > 30 –> 0.25 lb/wk = 10-20 lbs
What are GI side effects of pregnancy?
how to treat them? (5)
1) GERD –> PPO
2) Nausea –> ondansetron
3) constipation –> stool softeners + motility agents
4) Iron deficiency –> iron supplement + stool softener
5) Gallbladder disease –> remove in 2nd trimester unless emergent
Downs
Edwards
Patau
chromosome?
Downs = 21 Edwards = 18 Patau = 13
1st trimester screening tests?
1) US for nuchal translucency ( trans < 2 mm)
2) PAPP-A
3) hCG
2nd trimester tests
Triple screen = hCG, AFP, Estriol
Quad screen = add Inhibin-A
Pattern of 2nd trimester tests in Downs vs. Edwards
Downs is UP (INCREASE hCG, decrease AFP, decrease estriol, INCREASE inhibin A)
edwards (decrease hcg, AFP, estriol, inhibin A
Combined screen
1st + 2nd trimester screening done before doing any confirmatory tests = increased sensitivity, but decreased options because later in pregnancy
Sequential screen
1st tri tests
1) if positive –> invasive test
2) if negative –> 2nd tri tests
Increases number of invasive tests and thus increased fetal loss
increased options though also
Pre-Conception…what do you think about?
1) Safety (genetics, maternal age, DV, abuse)
2) Vitamins (FOLATE!)
3) Vaccines ( flu, HBV, MMRV –> want MMRV BEFORE pregnancy, because can’t give after pregnant - live vaccine)
4) Lifestyle (smoking, ETOH)
5) optimize other disease (HTN, DM, hypoT)
what does GPA and TPAL stand for?
Gravid (number of times with something in your uterus)
Para (deliver events)
Abortions
Term
Preterm
Abortions
Living
Initial tests in 1st trimester (around week 10)
1) urine preg
2) US –> confirms IUP, gestational age, if there are multiple gestations
3) serum B-HCG (confirm if too soon for US)
Labs at 1st trimester
Blood:
1) ABO type
2) Rh-Ag
3) Hgb/Hct
4) HIV, HBV, RPR
5) titers (varicella, rubella)
Urine:
1) UA + cx
2) proteinuria
3) GC/Chlamydia
Main things to screen for in third trimester (3)
1) Gestational DM
2) Alloimmunization
3) Maternal anemia
Gestational DM
DM starts AFTER 20 wks
- Risks = increased BMI, GDB before, pre DM
- TX with insulin
DX of gestational DM
1-hr glucose tolerance test (GTT) –> > 140 after 1 hour
3-hr GTT –> fasting > 90, 1hr > 180, 2hr > 155, 3hr >140 - must have 2/4 abnormal
Alloimunization (Rh Ag Status)
- Rh-Ag (-) mom + Rh-Ag (+) baby + Rh-Ag (+) baby #2
- Rh-Ag (-) mom develops Rh-Ab (+)
IF mom is Ab positive already and baby is Rh-Ag (+) –> transcranial doppler to r/o fetal anemia
IF mom is Rh-Ab negative still –> RHOGHAM at 28 weeks and within 72hrs of delivery to prevent mom from ever developing antibodies
normal maternal Hgb
Hgb > 10 or Hct > 30%
Treatment of UTIs in pregnancy
1) use amoxicillin (1st line) or Nitrofurantoin (2nd line) for asx bacteruria or cystitis
2) use CTX and admit if pyelo (cannot use TMP-SMX or cipro like usual outpatient)
Treatment of:
- HYPO thyroid
- HYPER thyroid
in pregnancy
HYPO thyroid –> levothyroxine (more thyroid binding globulin –> must increase dose, f/u TSH Q4wks)
HYPER thyroid –> PTU, surgery (2nd trimester)
what anti-epileptic drugs should be used in pregnancy
ideally none…if you have to use them then use Leviteracetam or lamotrigine
DO NOT use phenytoin, valproic acid, carbemazepine
TX of status –> phenobarbital
HTN treatment during pregnancy
goal <140/<80
a-methyl dopa (1st line), labetalol, hydralazine = SAFE in pregnancy
increase frequency of screening for eclampsia
DM before, during and after pregnancy
Before = A1C < 7%, change from oral to insulin During = increased insulin requirement, use basal-bolus based on post-pradial BS target After = decreased insulin requirements
what happens if DM is out of control during pregnancy?
1) transposition of great vessels
2) Macrosomia –> shoulder dystocia
3) increased risk C section
Stages of normal labor
1) Stage I, latent (0-6 cm)
2) Stage I, active (6-10 cm)
3) Stage II (10 cm - fetus delivered)
4) stage III (fetus - placenta delivered)
Normal speed of Stage I latent and active?
latent = < 20 hrs (NP) or < 14 hrs (MP) Active = 1.2 cm/hr (NP) or 1.5 cm/hr (MP)
Normal speed of stage II and III
stage II = < 3hr (NP), < 2 hr (MP)
stage III = 30 minutes
what cervical changes take place
- Breakage of disulfide bonds –> water
- softening, effacement, dilation, position –> 2/2 fetal head engagement (+ prostaglandins, oxytocin)
Fetal station
level of fetus from -5 (uterus) to +5 (vaginal opening) with O being in the center of the ischial spines
the more (-) = more likely to do c section
3 possible fetal positions?
1) Long cephalic (nml)
2) long breach
3) transverse
breach types?
1) Frank - hips flexed, knee extended
2) complete - hips flexed, knee flexed
3) Footling - hips extended, knees anyway
How to speed up latent stage I?
engagement of fetal head…
1) balloon
2) amniotome
3) induce with misoprostol or oxytocin (increase frequency and strength of contractions)
How to speed up active stage I?
oxytocin –> can proceed to c-section if contractions are already adequate
how to speed up stage II?
oxytocin –>
- if baby in + fetal station (closer to vaginal opening) –> forceps, vacuum
- if baby in - fetal station (closer to uterus) –> c-section
how to speed up stage III?
1) uterine massage
2) oxytocin
3) manual extraction
what are 3 possible causes of delayed stage progression?
3 P’s:
1) passenger
2) Pelvis
3) Power
if its a passenger or pelvis problem –> proceed to c-section
if its a power problem –> oxytocin
what is considered “adequate” contractions?
200 MV per 10 min (measure with IUPC)
What is considered preterm? term?
24-37 weeks = preterm
37-42 = term
>42 wks = post dates
What is considered prolonged rupture of membranes?
> 18 hrs
Rupture of Membranes
amniotic sac fluid released
- spontaneous, artificially, or pathologic (usually infection)
- can be stained with meconium, bloody, or clear
How do you diagnose ROM
treatment?
speculum exam –> see pooling
nitralazine –> blue
on a slide you see FERNING
TX:
- term –> deliver
- < 20 wks –> deliver
- > 20 wks –> term (risks/benefits - infection vs. maturation of baby)
Premature ROM (PROM) -causes? (2)
-usually 2/2 infection, GBS
+ ROM, +term, NO contractions
pre-term premature ROM (pPROM)
-usually 2/2 infection, GBS
+ROM, NOT TERM, NO CONTRACTIONS
If > 34 weeks –> DELIVER
if < 24 weeks –> abortion
in between –> steroids
Endometritis/Chorioamnionitis
path: vaginal flora ascends
Chorio = infection of the membranes and amniotic fluid surrounding the fetus. Most common precursor to neonatal sepsis.
Endo = most common cause of post-partum fever. infection of endometrium
it is endo if baby is OUT, chorio if baby is IN
-pt is febrile and toxic looking
DX - UA, CXR, blood cx (r/o other causes)
TX gram- and anaerobes –> AMP + GENT +/- CLINDA
Prolonged ROM
vaginal flora and infection can get in (e.g. GBS)
-when > 18hrs after delivery
TX = delivery
f/u endometritis/chorioamnionitis
Risks of preterm delivery
smoking, decreaed maternal age, multiple gestations, pPROM, anatomical
What is preterm delivery, what do you do?
+ contractions AND cervical change, but NOT term
-TX –> > 34 wks = deliver
< 20 wks –> abortion
in between –> steroids, tocolytics (gives you hours/days)
Post Dates
increased risk of macrosomia, shoulder dystocia
pt > 40 wks conceptions and > 42 wks by dates
-TX depends on how sure you are on dates…if cervical is favorable positioning? Use NST, US, BAP
Treatment of chronic HTN in pregnancy
sustained HTN before 20 wks
- use a-methyldopa, labetalol, hydralazine
- need more frequent f/u for UA, frequent US