OB Complications- Test 2 Flashcards
preterm infant
prior to 37 weeks gestation
between 20 0/7 and 36 6/7
low birth weight
<2500 gm
very low birth weight
<1500 gm at birth
extremely low birth weight
<1000 gm at birth
threshold of viability
22-24 weeks
demographic characteristics of preterm
non caucasian race extremes in ages (<17 or >35 yrs) low socioeconomic status lowe prepregnancy BMI history or preterm delivery interpregnancy interval <6 months abnormal uterine anatomy truma abd surgery during pregnancy
behavioral factors
tobacco use
substance abuse
obstetric factors
vaginal bleeding infection short cervical length multiple gestations assisted reproductive technologies preterm premature rupture of membranes polyhydramnios
process of parturition
0-quiescence
1-activation
2-stimulation
3- involution
causes of preterm labor
systemic and uterine infections (most common)
uteroplacental thrombosis
intrauterine vascular lesions (fetal stress or decidual hemorrhage)
uterine overdistension
cervical insufficiency
preterm delivery due to
preterm premature rupture of membranes
spontaneous preterm labor
maternal fetal indications
preterm anestheic management
neuroaxial
csection
tocolytic therapy (CCB, Indomethacin (cycooxygenase inhibitor), terbutaline (beta adrenergic receptor agonist), magnesium sulfate
side effects of terbutaline
hypotension, tachycardia, pulmonary edema, hyperglycemia, hypokalemia
presentation
portion of fetus over pelvic inlet
lie
alignment of fetal spine with maternal spine
position
relationship of specific fetal bony point to maternal pelvis
occiput
position for vertex presentation
sacrum
postion for a breech presentation
mentum
position for face presentation
acromion
position for shoulder presenation
uterine distension or relaxation factors associated with breech presentation
multiparity
multiple gestation
hydramnios
macrosomia
abnormalities of the uterus or pelvis factors associated with breech presentaiton
pelvic tumors
uterine anomalies
pelvic contracture
abnormalities of the fetus factors associated with breech presentation
hydrocephalus
anencephaly
obstetric conditions factors associated with breech presentation
previous breech delivery preterm gestation oligohydramnios cornual-fundal placenta placenta previa
anesthesia for breech delivery
should be in OR and prepped for emergency GA
may need more dense anesthesia
increase GA halogenated agents for uterine relaxation
what is the worst fear for breech delivery
fetal head entrapment
what agent could be used to produce uterine relaxation for breech presentation if using NA
NTG
what is the LA of choice for a dense block while delivering breech baby
3% chloroprocaine or 2% lidocaine with epi and bicarb
monoxygotic twins
single fertilized ovum divides
disygotic twins
2 ova fertilized
placentation
dichorionic diamniotic
monochorionic diamniotic
monochorionic amniotic
multiple gestation
cardiovascular and respiratory changes intensified
20% greater CO
15% great SV
3.5% increase in HR
what are the two causes of hypoxemia occuring more rapidly?
decrease in FRC and increase in maternal metabolic rate
maternal weight is greater rate at what time for multiple gestation parturients?
30 weeks
plasma volume is increased with multple gestation parturients by what value
750mL
fetal complications associated with multiple gestation
preterm delivery congenital anomalies polyhydramnios cord entanglement cord prolapse fetal growth restriction twin to twin transfusion malpresentation
maternal complications associated with multiple gestation
preterm rupture of membranes preterm labor prolonged labor preeclapsia or eclampsia placental abruption DIC operative delivery uterine atony obstetric trauma antepartum or postpartum hemorrhage
what is the optimal management of multiple gestation labor?
epidural
true or false multiple gestation pregnancies require full lateral position
yes increased risk for aortocaval compression
true or false multpile gestations require large bore IVs
true, increased risk of hemorrhage
when should epidurals be augmented for delivery of multiple gestations?
for delivery of twin A; augment with more concentrated local
what should sensory level for delivery of twin A be?
T6-T8
where should the sensory level be extended to for delivery of baby B?
T4-T8
If cesarean required for twin B, what med should be added?
nonparticulate antacid
gestational hypertension
HTN after 20 wks WITHOUT proteinuria
when does gestational HTN resolve?
12 wks postpartum
preeclampsia
new onset HTN and proteinuria after 20 wks gestation
if no proteinuria preeclampsia should be considered with new onset HTN after 20 weeks and the addition of?
persistent epigastric or RUQ pain persistent cerebral symptoms fetal growth restriction thrombocytopenia elevated liver enzymes
eclampsia is signaled with the onset of what?
seizures
HELLP syndrome stands for what?
homolysis, elevated liver enzymes, low platelet count in woman with preeclampsia
chronic hypertension
prepregnancy systolic BP >140 and or diastolic >90 or elevated unresolved BP after delivery
chronic HTN with superimposed preeclampsia
presence of HTN prior to pregnancy
new onset proteinuria or sudden increaes in proteinuria or hypertension or both
diagnostic criteria for preeclampsia without severe features
BP >140/90 after 20 wks
proteinuria (>300mg/24hrs)
protein-creatnine ration >0.3 or 1 on dipstick
preeclapsia with severe symptoms
BP >160/110
thrombocytopenia (platelets <100,000/mm3)
serum cr concentration >1.1mg/dl or >2 from baseline
pulmonary edema
new onset cerebral or visual disturbances
impaired liver function
maternal syndrome
HTN and proteinuria with or without other systemic abnormalities
fetal syndrome
fetal growth restriction
oligohydramnios
abnormal oxygen exchange
preeclampsia presents more frequently in this pooulation
nulliparous usually 3rd trimester
when does preeclampsia usually resolve?
within 48 hrs of delivery
what CNS symptoms accompany preeclampsia
severe HA hyperexcitability hyperreflexia coma visual disturbances (scotoma, amaurosis, blurred vision)
true or false; eclampsia is outward manifestation of disease progression in the brain
true
airway changes in preeclampsia
pharyngolaryngeal edema
subglottic edema
pulmonary changes in preeclampsia
DECREASED colloid osmotic pressure
INCREASED vascular permeability
loss of intravascular fluid and protein into interstitium
–> pulmonary edema
cardiovascular effects of preeclampsia
hypertension vasospams end organ ischemia hyperdynamic state increase CO hyperdynamic LV function increased SVR exaggerated response to catecholamines
hematologic changes in preeclampsia
thrombocytopenia (most common) platelets <100,000
DIC (in liver involvement, intrauterine fetal demise, placental abruption, postpartum hemorrhage)
liver presentation in preeclampsia
periportal hemorrhage and fibrin deposits
renal presentation in preeclampsia
proteinuria,
decreased GFR
hyperuricemia
oliguria (late but severe symptom)
labetolol dose
20mg IV then 40-80mg q 10mins
max 220mg
hydralazine dose
5mg q 20mins
max 20mg
nifedipine dose
10mg PO q 20mins up to 50mg
nicardipine dose
initial infusion of 5mg/h, increase by 2.5mg/h every 5min to max of 15
sodium nitroprusside dose
0.25-5 mcg/kg/min IV infusion
nifedipine dose
10mg PO q 20mins up to 50mg