ch. 32 labor birth complications Flashcards
preterm labor and birth
preterm labor: regular contractions along with a change in cervical effacement or dilation or both or presentation with regular uterine contractions and cervical dilation of atleast 2 cm.
- any birth that occurs between 20-36 weeks gestation
decreasing rates of preterm birth in the last decade is due to
1) improved fertility practices that reduce the rusk for higher oder multiple gestations
2) quality improvement programs that limit scheduled preterm births to only those with valid indications
3) increased efforts to prevent recurrent preterm birth
subcategories of preterm labor and birth
1) very preterm (<32 weeks of gestation)
2) moderately preterm (32-34 weeks of gestation)
3) late preterm (34-26 weeks of gestation)
preterm birth vs. low birth weight
- preterm birth or prematurity: length of gestation regardless of birth weight
- more dangerous than birth weight alone because less time in the uterus correlates with immaturity of body systems
- low birth weight: </= 2500 grams at birth
- causes: intrauterine growth restriction (IUGR)
sponteneous vs. indicated preterm birth
- spontaneous: 75% of preterms birth
- indicated: 25% of preterm births
causes of spontaneous preterm labor and birth
- multifactoral; multiple pathologic processes
- infection is the only definitive factor (preterm labor)
- congenital structural abnormalities of the uterus
- placental causes (placenta previa/abruptio placentae)
- maternal and fetal stress
- uterine overdistention
- allergic reaction
- decrease in progesterone (maintains pregnancy)
predicting spontaneous preterm labor and birth
- RF
- cervical length: 2nd trimester U/S, >30 mm in the 2/3 trimester unlikely to give birth prematurely (shorten/tunneling cervix)
- fetal, fibronectin test: fFN is a glycoprotein “glue” found in plasma and produced during fetal life
- test is used to predict who will NOT go into preterm labor d/t high negative predictive value
PTL interprofessional care mgmt
1) assessment: patient teaching (medical leave)
2) interventions:
- prevention
- early recognition and diagnosis
3) lifestyle modifications
- activity restriction (no evidence to support bedrest, should NOT be routinely recommended)
- restriction of sexual acitivty (trigger PTB)
- home care
4) suppression of uterine activity
- tocolytic medications: terbutaline, magnesium sulfate, endomethacin
5) promotion of fetal lung maturity:
- antenatal glucocorticoids (betamethacine)
6) mgmt of inevitable preterm birth: fetal and early neonatal loss
prelabor rupture of membranes
spontaneous rupture of amniotic sac and leakage of fluid prior to the onset of labor at any gestation age
1) PPROM: membranes rupture before 37 weeks of gestation
- complicates approximately 3% of all pregnancies in the US
- often preceded by infection (chorioamniotitis)
PROM vs PPROM interprofessional care mgmt
- determined individually for each women (gestational age)
- PPROM at less than 32 weeks is managed expectantly or conservatively
- vigilance for signs of infections
- fetal assessment
- antenatal glucocorticoids for all women with preterm PROM between 24 and 34 weeks of gestation
- 7 day course of broad spectrum antibiotics (ampicillin, gentomycin)
- administering mag sulfate for fetal neuroprotection
amniotic sac rupture, what to look out for
watch temperature for infection
chorioamniotitis
- bacterial infection of the amniotic cavity
- major cause of complications for mothers and newborns at any gestational age (sepsis)
- occurs in approximately 1-5% term births but in as many as 25% preterm births
- diagnosed by the clinical findings of maternal fever, maternal and fetal tachycardia, uterine tenderness, and foul odor of amniotic fluid
- neonatal risks
- treatment
4 signs:
- fever
- tachycardia
- uterine tenderness
- strong vaginal odor
posterm pregnancy (postdates)
- pregnancy greater than or equal to 42 weeks gestation
(less than 0.25% of all births in the US)
maternal/fetal risks:
- severe perineal injuries
- increased maternal morbidity
- labor and birth interventions more likely
- abnormal fetal growth (macrosomia)
- operative birth and shoulder dystocia, leading to fetal injury
- cord compression resulting in hypoxemia
- increased risk of meconium aspiration
- post-maturity syndrome: fetus stops grow, placenta stops function, will lose weight, wrinkly skin
postterm pregnancy, labor and birth interprofessional care mgmt
- controversial
- perinatal morbidity and mortality increase greatly beginning at 41 weeks of gestation
1) more frequent feta assessment, testing:
- NST
- CST
- BPP
- modified BPP
- women is encouraged to assess fetal activity daily, assess for signs of labor, and keep appointments with her obstetric health care provider
dysfunctional labor (dystocia)
dystocia: lack of progress in labor for any reason
dysfunctional labor: long, difficult, or abnormal labor
- most common indications for c-birth; responsible for approximately 1/3 of all c-births
review:
5 factors that affect labor:
- power
- passage
- passenger
- maternal position
- psychologic responses