Chapter 17: Labor & Birth Complications

Labor & Birth Complications explores the range of labor and birth complications that heighten the danger of adverse perinatal outcomes, covering issues from deviations in gestation timing to critical obstetric emergencies, necessitating prompt, collaborative intervention from the healthcare team. Preterm birth, defined as delivery between 20 0/7 and 36 6/7 weeks of gestation, is distinguished clinically from low birth weight, with categories including very preterm, moderately preterm, and late preterm, where the greatest mortality and morbidity risks exist before 26 weeks. Most preterm births are spontaneous, often linked to factors like prior history, infection, multifetal gestation, or racial disparities, while others are indicated due to maternal or fetal conditions like chronic hypertension or placental disorders. Predicting spontaneous preterm labor involves assessing risk factors, cervical length via ultrasound (where a length (greater than) 30 mm generally rules out early birth), and the fetal fibronectin (fFN) test, which is most valuable for its high negative predictive value, indicating a low likelihood of birth within two weeks. Management focuses on delaying birth long enough for antenatal glucocorticoids (like betamethasone or dexamethasone) to maximize fetal lung maturity and administering magnesium sulfate for neuroprotection in women anticipating birth before 32 weeks of gestation. Medications used to suppress uterine activity (tocolytics) include magnesium sulfate, beta-adrenergic agonists (like terbutaline), nifedipine (a calcium channel blocker), and indomethacin (an NSAID), though these are primarily used to allow time for transport and corticosteroid efficacy rather than consistently reducing preterm birth rates. A related issue, prelabor rupture of membranes (preterm PROM), often involves expectant management before 32 weeks, including antibiotic use to prolong the latency period and vigilance for chorioamnionitis, a bacterial infection of the amniotic cavity characterized by maternal fever and tachycardia. Conversely, postterm pregnancy continues past 42 0/7 weeks and increases the risk of macrosomia, decreased amniotic fluid (oligohydramnios), meconium aspiration, and requires fetal surveillance beginning at 41 0/7 weeks, typically followed by labor induction. Dysfunctional labor (dystocia) represents abnormal or difficult labor, potentially stemming from ineffective contractions (hypotonic or hypertonic dysfunction), issues with the fetus (passenger), or alterations in the maternal pelvic structure (passage). Procedures to manage labor complications include external cephalic version (ECV) to turn a breech fetus, cervical ripening using prostaglandins (like misoprostol or dinoprostone), and induction/augmentation with oxytocin or amniotomy. Cesarean birth, the most common surgical procedure globally, is indicated for fetal distress, certain malpresentations, or failure to progress, and surgical standards follow guidelines designed to enhance recovery (ERAS). Finally, nurses must be prepared for critical obstetric emergencies, such as shoulder dystocia (head born but shoulders stuck, requiring maneuvers like McRoberts), prolapsed umbilical cord (immediate pressure relief is vital), uterine rupture (often related to a previous uterine scar), and amniotic fluid embolus (AFE), a sudden onset of maternal hypoxia, hypotension, and hemorrhage.