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Preterm Labor

NCLEX Review Guide: Preterm Labor

Definition and Risk Factors

Preterm Labor Overview

  • Preterm labor is regular uterine contractions with cervical changes occurring between 20-37 weeks gestation. Early recognition and intervention are crucial to prevent complications and improve neonatal outcomes.
  • Risk factors include multiple gestations, previous preterm birth, cervical incompetence, infections, substance abuse, maternal age extremes, and chronic conditions like diabetes or hypertension.

Memory Aid: PRETERM

  • Previous preterm birth
  • Rupture of membranes
  • Extreme maternal age
  • Twins/multiples
  • Ethnic factors (African American)
  • Recurrent UTIs
  • Maternal substance abuse

Key Points

  • Gestational age 20-37 weeks defines preterm labor
  • Cervical changes must accompany contractions for diagnosis
  • History of preterm birth increases risk by 2.5 times

Assessment and Diagnosis

Clinical Manifestations

  • Signs include regular uterine contractions (4+ in 20 minutes or 8+ in 60 minutes), pelvic pressure, low backache, cramping, and increased vaginal discharge. Cervical changes include effacement >80% or dilation >1cm.
  • Critical Assessment: Fetal fibronectin test and cervical length measurement via transvaginal ultrasound are key diagnostic tools for predicting preterm delivery risk.

Clinical Scenario

A 28-year-old G2P1 at 32 weeks presents with regular contractions every 5 minutes, pelvic pressure, and backache. Cervix is 2cm dilated, 70% effaced. Priority nursing action is to assess fetal status and administer tocolytics as ordered.

Key Points

  • Contractions must be regular and progressive
  • Cervical changes confirm active preterm labor
  • Fetal fibronectin >50 ng/mL indicates high risk

Medical Management

Tocolytic Therapy

  • Tocolytics are medications used to suppress uterine contractions and delay delivery. Magnesium sulfate, nifedipine, and indomethacin are commonly used, each with specific indications and contraindications.
  • Magnesium Sulfate Monitoring: Watch for signs of toxicity including absent deep tendon reflexes, respiratory depression <12/min, and urine output <30mL/hr. Keep calcium gluconate readily available as antidote.
  1. Assess maternal vital signs and fetal heart rate
  2. Administer IV fluids to ensure adequate hydration
  3. Position client in left lateral position
  4. Administer prescribed tocolytic medication
  5. Monitor for side effects and therapeutic response
  6. Prepare for corticosteroid administration if indicated

Tocolytic Medications Comparison

MedicationMechanismKey Side EffectsMonitoring
Magnesium SulfateCNS depressantRespiratory depression, hypotensionDTRs, respirations, urine output
NifedipineCalcium channel blockerHypotension, tachycardiaBlood pressure, heart rate
IndomethacinProstaglandin inhibitorOligohydramnios, renal dysfunctionAmniotic fluid levels, fetal heart rate

Key Points

  • Tocolytics delay delivery but don't prevent preterm birth
  • Magnesium sulfate requires close monitoring for toxicity
  • Corticosteroids enhance fetal lung maturity

Nursing Interventions

Priority Nursing Care

  • Immediate interventions include positioning client in left lateral position, ensuring IV access, continuous fetal monitoring, and assessing contraction pattern. Emotional support and education are equally important for maternal anxiety reduction.
  • Bed Rest Considerations: While historically prescribed, current evidence shows limited benefit of strict bed rest and may increase risk of thromboembolism and muscle weakness.

Memory Aid: STOP Labor

  • Side-lying position
  • Tocolytics as ordered
  • Oxygen if needed
  • Position for comfort and circulation

Key Points

  • Left lateral position improves uteroplacental blood flow
  • Continuous monitoring is essential during tocolytic therapy
  • Emotional support reduces maternal anxiety and stress

Quick Check

Question: Which assessment finding indicates magnesium sulfate toxicity?

Answer: Absent deep tendon reflexes, respirations <12/min, urine output <30mL/hr

Commonly Confused Concepts

Preterm Labor vs. Braxton Hicks Contractions

Differential Diagnosis

CharacteristicPreterm LaborBraxton Hicks
RegularityRegular, increasing frequencyIrregular, sporadic
IntensityProgressively strongerMild, no progression
Cervical ChangesEffacement and dilation occurNo cervical changes
Response to ActivityContinues with rest/position changeStops with rest/position change
LocationBack radiating to abdomenLocalized to abdomen

Key Points

  • True preterm labor shows progressive cervical changes
  • Braxton Hicks contractions are preparatory, not progressive
  • When in doubt, always assess cervical status

Study Tips and Common Pitfalls

NCLEX Success Strategies

Common Pitfalls to Avoid

  • Don't confuse gestational age limits (20-37 weeks for preterm)
  • Remember magnesium sulfate antidote is calcium gluconate, not calcium chloride
  • Tocolytics delay delivery but don't prevent preterm birth
  • Bed rest is not routinely recommended due to complications

Self-Assessment Checklist

  • ☐ Can I identify risk factors for preterm labor?
  • ☐ Do I know the signs of magnesium sulfate toxicity?
  • ☐ Can I differentiate true labor from Braxton Hicks?
  • ☐ Do I understand tocolytic mechanisms and monitoring?
  • ☐ Can I prioritize nursing interventions for preterm labor?

Key Points

  • Focus on assessment findings that indicate true preterm labor
  • Know medication side effects and antidotes
  • Prioritize maternal and fetal safety in all interventions

Remember, you've got this! Understanding preterm labor management is crucial for protecting both mother and baby. Focus on early recognition, appropriate interventions, and continuous monitoring. Your knowledge and skills will make a difference in maternal-newborn outcomes. Keep studying and trust in your preparation!

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