Labor Complications

Critical Labor Complications Encountered in the ED

Labor complications encompass a range of potentially life-threatening conditions that can arise during the intrapartum period. For the Certified Emergency Nurse (CEN), rapid recognition and initial management are critical to maternal and fetal outcomes. This section covers the high-yield complications—umbilical cord prolapse, shoulder dystocia, uterine rupture, amniotic fluid embolism (AFE), and placental abruption—commonly tested on the CEN exam and encountered in the emergency department (ED).^[1]

Essential Terminology for Labor Emergencies

• Umbilical cord prolapse: Descent of the umbilical cord through the cervix alongside or past the presenting part, often after rupture of membranes (ROM). Overt prolapse is visible at the vaginal introitus; occult prolapse is palpable on vaginal exam only.
• Shoulder dystocia: Failure of the fetal shoulders to deliver after the head, requiring additional obstetric maneuvers (e.g., McRoberts, suprapubic pressure). Risk factors include fetal macrosomia, maternal diabetes, and prolonged labor.^[2]
• Uterine rupture: Complete disruption of all layers of the uterine wall, most commonly at the site of a previous cesarean scar. It causes catastrophic hemorrhage and fetal compromise.
• Amniotic fluid embolism (AFE): Rare but severe obstetric emergency in which fetal debris enters maternal circulation, triggering anaphylactic shock, disseminated intravascular coagulation (DIC), and cardiac arrest.^[3]
• Placental abruption: Premature separation of a normally implanted placenta from the uterine wall before delivery, leading to concealed or overt hemorrhage, pain, and fetal distress.

Mechanisms Underlying Obstetric Emergencies

• Cord prolapse compresses the umbilical vessels between the presenting part and the pelvic brim, reducing fetal oxygenation. The lower the presenting part, the greater the compression.
• Shoulder dystocia occurs when the anterior fetal shoulder becomes impacted behind the maternal pubic symphysis. Turtleneck sign (retraction of the fetal head against the perineum) is a classic clinical clue.
• Uterine rupture leads to immediate loss of uterine integrity, expulsion of the fetus into the abdominal cavity, and severe maternal hemorrhage. Risk increases with a trial of labor after cesarean (TOLAC).
• AFE triggers a biphasic response: first, pulmonary vasospasm and right heart failure; second, left ventricular failure, DIC, and hemorrhage. No definitive diagnostic test exists; diagnosis is clinical.^[3]
• Abruption results from decidual hemorrhage behind the placenta, leading to premature separation. Concealed abruption may not show visible bleeding but causes high uterine tone, pain, and fetal compromise.

Clinical Manifestations of Intrapartum Emergencies

Umbilical Cord Prolapse

• Visible or palpable umbilical cord at the vaginal opening
• Sudden severe variable decelerations or fetal bradycardia on fetal monitoring after ROM
• Cord may be felt on vaginal exam as a pulsating, rope-like structure

Shoulder Dystocia

• Head delivers but retracts against the perineum (turtle sign)
• Failure of external rotation and descent despite maternal pushing
• Prolonged second stage of labor

Uterine Rupture

• Sudden, severe abdominal pain (often described as a tearing sensation)
• Loss of uterine contour and cessation of contractions
• Fetal bradycardia or absent heart tones
• Maternal tachycardia, hypotension, and signs of shock
• Vaginal bleeding may be absent if the rupture is contained.

Amniotic Fluid Embolism

• Sudden onset of dyspnea, cyanosis, and hypoxia
• Hypotension, tachycardia, and altered mental status
• Seizures or cardiac arrest
• Coagulopathy (DIC) with oozing from IV sites
• Pulmonary edema on chest radiograph

Placental Abruption

• Vaginal bleeding (may be concealed)
• Constant, rigid, boardlike uterine tenderness
• Increased uterine tone with frequent low-amplitude contractions
• Fetal distress with late decelerations or sinusoidal pattern
• Maternal hypovolemia out of proportion to visible blood loss

Initial Diagnostic Steps for Labor Complications

Initial ED Assessment

• Primary survey (ABCDE): Assess airway, breathing, circulation. Administer high-flow oxygen. Obtain two large-bore IVs. Draw labs: CBC, coagulation panel, type & screen, fibrinogen, and arterial blood gas if indicated.
• Fetal monitoring: Continuous electronic fetal monitoring (EFM) to assess pattern and variability. Note baseline rate, presence of accelerations, decelerations, and uterine activity.
• Pelvic exam (if no placental previa): Check for cord, assess dilation, station, and presenting part. Inspect for bleeding or amniotic fluid color.
• Point-of-care ultrasound (POCUS): Evaluate fetal position, amniotic fluid volume, placental location, and presence of retroplacental clot (abruption). In AFE, assess global left or right ventricular function.

Diagnostic Studies

• Cord prolapse: Clinical diagnosis; POCUS may confirm cord location.
• Shoulder dystocia: Clinical diagnosis; no imaging needed before maneuvers.
• Uterine rupture: Ultrasound may show free fluid in abdomen or absence of fetal head in pelvis. Definitive diagnosis often at laparotomy.
• AFE: Diagnosis of exclusion; labs show DIC (low fibrinogen, elevated D-dimer, prolonged PT/PTT). Transthoracic echo may show right ventricular strain.^[3]
• Abruption: Ultrasound sensitivity is low (only ~50% for small abruptions). Clinical presentation and EFM are key.

Immediate Management Protocols for Labor Crises

Umbilical Cord Prolapse

1. Call for help: notify OB team immediately. Prepare for emergent cesarean delivery.
2. Relieve cord compression: place the patient in knee-chest or Trendelenburg position.
3. Apply sterile gloved hand into vagina to elevate the presenting part off the cord. Maintain this pressure until delivery.
4. Administer tocolytic (e.g., terbutaline 0.25 mg subcutaneously) if uterine contractions are contributing to compression.^[4]
5. Keep the cord moist with warm saline-soaked gauze to prevent vasospasm.
6. Supplement oxygen at 10–15 L/min via non-rebreather mask.

Shoulder Dystocia

1. Call for additional help, including an experienced obstetrician and neonatal resuscitation team.
2. Perform McRoberts maneuver: hyperflexion of the maternal thighs onto the abdomen to flatten the lumbar lordosis and rotate the pubic symphysis cephalad.
3. Apply suprapubic pressure (from the side of the fetal back) to push the anterior shoulder under the pubic bone. Do not apply fundal pressure.
4. If unsuccessful, attempt internal rotational maneuvers (Rubin II or Woods screw).
5. Last-resort maneuvers: deliver the posterior arm, or consider intentional clavicular fracture/Zavanelli maneuver (cephalic replacement).
6. Document all maneuvers and the duration from head to body delivery (target <60 seconds).^[2]

Uterine Rupture

• Immediately prepare for emergency laparotomy (cesarean delivery or hysterectomy).
• Initiate massive transfusion protocol with blood products (packed RBCs, fresh frozen plasma, platelets). Use a 1:1:1 ratio if possible.
• Administer tranexamic acid 1 g IV over 10 minutes to reduce hemorrhage.^[5]
• Activate surgical team: repair of the rupture or hysterectomy depending on viability and patient stability.

Amniotic Fluid Embolism

• Activate the maternal cardiac arrest protocol if pulseless. Perform high-quality CPR with left uterine displacement.
• Administer 100% oxygen via endotracheal intubation. Use lung-protective ventilation.
• Treat hypotension with balanced crystalloids and vasopressors (epinephrine 1 mg IV/IO every 3–5 minutes during arrest).
• Manage DIC with product replacement based on serial labs (fibrinogen >200 mg/dL target).
• Consider veno-arterial ECMO in refractory cases. Arrange for immediate obstetric consultation.^[3]

Placental Abruption

• Assess maternal hemodynamics and volume status. Insert Foley catheter to monitor urine output.
• Replace volume with blood products even if vital signs appear stable—concealed bleeding can be severe.
• If fetus is viable and distress is present, proceed with emergent cesarean delivery.
• If fetus is not yet viable or labor is progressing well, expectant management may be considered under careful monitoring.
• Administer corticosteroids for fetal lung maturity if <34 weeks and delivery can be delayed >48 hours (only in stable abruption).

Critical Safety Considerations in Obstetric Emergencies

• Cord prolapse: Do not attempt to push the cord back into the uterus (risk of cord trauma and infection). Maintain tocolysis and manual elevation until birth.
• Shoulder dystocia: Never apply fundal pressure—it can worsen impaction and cause uterine rupture or fetal injury.^[2]
• Uterine rupture: A high index of suspicion is critical for patients with prior cesarean, especially if EFM shows prolonged bradycardia. Delay in surgical intervention leads to catastrophic maternal and fetal outcomes.
• AFE: Be aware that early symptoms (shortness of breath, hypotension) mimic other causes (pulmonary embolism, hemorrhage). Rapid progression to arrest is typical.
• Abruption: Couvelaire uterus (extravasation of blood into uterine muscle) may occur; it does not always require hysterectomy but requires monitoring for DIC. Cocaine use is a precipitating factor—assess urine toxicology if history suggests.

Exam-Relevant Focus for Intrapartum Emergencies

• Cord prolapse: Number one intervention is relieve compression (manual elevation, knee-chest position, tocolysis). The CEN exam often asks for the priority action.
• Shoulder dystocia: Mnemonic for sequence: Help, Evaluate for episiotomy, Legs (McRoberts), Pressure (suprapubic). Remember: NO fundal pressure.
• Uterine rupture: Most common cause in modern obstetrics is a previous cesarean scar. Classic triad: severe abdominal pain, loss of uterine contour, fetal bradycardia.
• AFE: Rapid onset DIC + cardiac arrest = think AFE in the peripartum patient. Treatment is supportive; the only definitive therapy is prompt delivery.
• Abruption: Boardlike abdomen, concealed bleeding with shock out of proportion, and cocaine use are classic exam favorites. Late decelerations or sinusoidal fetal heart pattern indicate severe fetal hypoxemia.
• Prioritize maternal safety: in all complications, the best chance for fetal survival is maternal stabilization. Surgical intervention is often emergent.

References & Sources

1. Emergency Nurses Association. Trauma Nursing Core Course (TNCC) Provider Manual. 8th ed. Des Plaines, IL: ENA; 2023. Accessed May 1, 2025. https://doi.org/10.1636/978-0-9997390-5-1
2. American College of Obstetricians and Gynecologists. Shoulder Dystocia. ACOG Practice Bulletin No. 178. Obstet Gynecol. 2017;129(5):e123–e133. https://doi.org/10.1097/AOG.0000000000002043
3. Clark SL, Hankins GDV, Dudley DA, et al. Amniotic fluid embolism: Analysis of the national registry. Am J Obstet Gynecol. 1995;172(4):1158–1169. https://doi.org/10.1016/0002-9378(95)91476-2
4. Royal College of Obstetricians and Gynaecologists. Umbilical Cord Prolapse: Green-top Guideline No. 50. 2014. https://www.rcog.org.uk/guidance/browse-all-guidance/green-top-guidelines/umbilical-cord-prolapse-green-top-guideline-no-50/
5. WOMAN Trial Collaborators. Effect of early tranexamic acid administration on mortality, hysterectomy, and other morbidities in women with post-partum haemorrhage (WOMAN): an international, randomised, double-blind, placebo-controlled trial. Lancet. 2017;389(10084):2105–2116. https://doi.org/10.1016/S0140-6736(17)30638-4