CNM Random 2013 Flashcards
term
37 0/7 - 41 6/7 (or 42 0/7 ?) weeks
preterm
32 0/7 - 36 6/7 wks
very preterm
28 0/7 - 31 6/7 wks
extremely preterm
23 0/7 - 27 6/7 wks
Dx of preterm labor
regular uterine contractions
cervical change
cervix 2cm or greater and/or 80% or greater effaced by U/S
Etiology of PTL: pregnancy factors
infection (ex: pyelonephritis) uterine bleeding (ex: abruption) multiple pregnancy & hydramnios uterine abnormalities (Asherman's syndrome) incompetent cervix
Etiology of PTL: epidemiologic factors
race (AA) maternal age (younger) socio-economic status (unmarried, low SES) working smoking psychological factors (stress, anxiety) previous OB hx nutritional status ???unknown causes
regarding PTL: an “injury” or inflammation (ischemic, infectious, traumatic, ?allergic) do what?
increase cytokine production that elicit production of prostaglandins
regarding PTL: prostaglandins do what?
stimulate myometrial contractions and may initiate release of protease that can injure the membranes and decidua
interactive risk factors
intensity and duration of insult, gestational age, nutritional status, immune function may affect risk of PTB
s/s of PTL
change in Braxton Hicks abdominal cramping menstrual-like cramps low back pain intermittent pelvic pressure change in character or amount of vaginal discharge \+ffn short cervical length
fFN
glycoprotein normally found in fetal membranes and decidua.
found in cervicovaginal fluid BEFORE 16-18 wks.
NOT USUALLY PRESENT 22-37 weeks!!!
negative fFN in a woman with preterm contractions
99% accurate for predicting no PTB in next 7 days
transvaginal sonographic cervical length
effective marker for predicting PTB, particularly in women symptomatic of preterm labor or at a higher risk of spontaneous PTB.
The greater the degree of funnelling measured, the more accurate sonography was in predicting PTB
guidelines for dx of PTL
s/s of PTL
Monitoring for fetal well-being and uterine activity
Transabdominal U/S for placental location, amniotic fluid volume, fetal presentation, EFW
Sterile spec
digital exam
sterile speculum exam in r/o PTL
fibronectin swab, GC/CT, fern, pooled fluid, cultured for GBS
Dx of BV
presence of clue cells
vaginal pH >4.5
profuse white discharge
fishy odor when d/c exposed to potassium hydroxide
sequelae of BV
1..5-3 fold increase in PTB (unsure why)
Black women have BV 3x more than white women
Tx of PTL: criteria for use of tocolytics
20-34 wks
contractions have effects on cervix
regular contractions
tocolytic choices in PTL
beta agonists magnesium sulfate anti-prostaglandins Ca channel agonists oxytocin antagonists progesterone
beta-adrenergic agonists in PTL
B1 receptors: heart, intestines
B2 receptors: myometrium, blood vessels, bronchioles
Terbutaline (sq, may be given IV)
S/E: maternal tachycardia, N/V, HA, dyspnea, nervousness, anxiety, fetal tachycardia, neo hypotension, hyperglycemia with consequent hypOglycemia, may increase incidence of intraventricular hemorrhage
Magnesium sulfate in PTL
Diminishes excitability of muscle fibers and relaxes uterus, alters myometrial contractility
S/E: maternal sweating, drowsiness, depressed reflexes, hypotension, respiratory arrest, depressed cardiac function, neonatal hypotonia, lethargy, weakness, low APGAR score
Prostaglandin synthase inhibitors in PTL
Block action of prostaglandin which are involved in myometrial contractility: Indomethacin (PO, PR)
-compared with beta-agonists, is more effective in delaying delivery by 48 hours and has fewer side effects
S/E: maternal N/V, heartburn, rare GI bleed, thrombocytopenia, increase BP in hypertensive women
-cannot be used for long-term management because it may produce closure of ductus arteriosus, necrotizing enterocolitis, intracranial hemorrhage
Ca channel blockers in PTL
Reduces Ca++ [ ] and inhibits contraction
Nifedipine
S/E: maybe maternal hypotension and decreased uteroplacental perfusion, HA, flushing
Progesterone in preventing PTL
17 alpha-hydroxyprogesterone acetate
Promising new tool to prevent PTB, for now restricted its use to previous unexplained spontaneous preterm birth
Reduction in the risk for PTB (<34 wks)
Reduction in LBW
Glucocorticoid rx in PTL
to accelerate lung maturation in fetus (<34 wks)
Effective in preventing RDS and neonatal mortality
A SINGLE course of steroids:
Betamethasone 12 mg IM, 2 doses q 24 hours -OR-
Dexamethasone 6 mg IM , 4 doses q 12 hours
Not sufficient evidence for repeated doses
Hydration in PTL
insufficient data to support hydration as a specific tx
Two studies did not show any advantage, even in the initial period after admission
Women with evidence of dehydration may benefit from this intervention
Psychologic factors with PTL/PTB
Stress (anxiety, perceived stress, psychological distress) assoc with increased risk of PTL/PTB
Stress stimulates HPA axis and increases production of cortisol and cytokines which have been correlated with PTL/PTB
Stress mgmt
PROM
after 37 weeks ROM at least 1 hr before onset of labor 8% of pregnancies 50% deliver within 5 hours 95% deliver within 28 hours If not in labor, proceed with induction
PPROM
BEFORE 37 weeks 3% of pregnancies Responsible for 1/3 of PTB 50-60% deliver w/i 1 wk 13-60% of intraamniotic infxn 2-13% postpartum infection 4-12% abruption placentae
Possible mechanisms of PPROM
choriodecidual infection collagen degradation decreased membrane collagen content localized membrane defects membrane stretch (uterine overdistention) programmed amniotic cell death
Risk factors for PPROM
amniocentesis cervical cerclage cervical insufficiency chronic abruption cigarette smoking LEEP prior PTB prior PTL prior PPROM low SES working in pregnancy
perinatal morbidities r/t PPROM
chorioamnionitis
umbilical cord compression d/t oligohydramnios
abruption
preterm birth (50-70% deliver w/i 1 week)
morbidities r/t PTB
RDS necrotizing enterocolitis intraventricular hemorrhage sepsis antepartum fetal death
dx for PROM
clinical presentation free flow pooling nitrazine paper testing ferning test U/S indigo carmine (1ml in 9ml NS)
Amnionitis
maternal or fetal tachycardia maternal fever leukocytosis uterine tenderness regular contractions decreased glucose level positive Gram stain by amniocentesis
antibiotics to prolong pregnancy in PPROM
= reduction in chorioamnionitis, postpartum endometritis, neonatal infection and sepsis, infants requiring O2 and surfactant Initial parenteral followed by PO therapy: Ampicillin 2gm IV q 6 hr x 48 hours THEN Amoxicillin 250 mg PO q 8 hr x 5 days AND Erythromycin 250 mg IV q 6 hr x 48 hr THEN Erythromycin 333 mg PO q 8 hr x 5 days
abdominal pain labs
For acute pain: CBC with differential electrolytes serum chemistries: bicarb, BUN, creatinine, serum glucose, amylase, lipase liver function tests: AST, ALT, alkaline phosphatase, bilirubin U/A coag labs Pregnancy test
pyelonephritis
E. coli often the cause
back/flank pain
fever/chills
malaise
N/V
U/A: hematuria, cloudy/foul-smelling/WBC/bacteria
dysuria/incr frequency/urgency
RX: abx x 7 days, at first in hospital, then PO at home
Nonpreg: cephalosporins (Rocephin), quinolones (Cipro), trimethoprim/sulfa (Bactrim)
PREGNANT: ampicillin plus gentamycin, cefazonlin (Ancef) and ceftriaxone (Rocephin)
infant with palpable liver and spleen
very common in infancy
small red papules on trunk of menopausal woman
cherry angiomas?
Campbell de Morgan spots
anemia
occurs when you have less than the normal number of red blood cells in your blood or when the red blood cells don’t have enough hemoglobin(protein that carries O2 from lungs to all parts of body).
Turner syndrome
Most girls are born with 2 X chromosomes, but girls with Turner are born with only 1 x or are missing part of 1 x chromosome. Affects 1 in every 2500 girls. Short stature(average 4’ 7’), ovaries don’t develop properly, nearly all will be infertile. Other physical features include:
•a “webbed” neck (extra folds of skin extending from the tops of the shoulders to the sides of the neck)
•a low hairline at the back of the neck
•drooping of the eyelids
•differently shaped ears that are set lower on the sides of the head than usual
•abnormal bone development (especially the bones of the hands and elbows)
•a larger than usual number of moles on the skin
•edema or extra fluid in the hands and feet
threshold for HTN and what to do about it
Blood Pressure Category Systolic (mm Hg) Diastolic (mm Hg)
Normal less than 120 and less than 80
Prehypertension 120-139 or 80-89
Hypertension. Stage 1 140-159 or 90-99
Hypertension. Stage 2 160 or higher or 100 or higher
High blood pressure usually has no symptoms. That’s why it’s called the “silent killer.”
Diet, weight reduction, physical activity, salt reduction, medication.
Graves
immune disorder that results in overproduction of thyroid hormones. Most common among women and before age 40.
Hep B
virus that causes liver disease, spread through blood and other bodily fluids.
degenerative discs
normal changes in spinal discs as you age. Most often occurs in lumbar and cervical region.
postpartum bleed but firm - now what?
a