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Hepatitis B

NCLEX Review Guide: Hepatitis B in Pregnancy

Hepatitis B Overview in Pregnancy

Pathophysiology and Transmission

  • Hepatitis B virus (HBV) is a DNA virus that causes inflammation of the liver and can lead to chronic infection, cirrhosis, and hepatocellular carcinoma.
  • Transmission occurs through blood, sexual contact, and vertical transmission from mother to baby during delivery or through breast milk if nipples are cracked.
  • The virus has a long incubation period of 45-180 days, making early detection challenging without screening.

Key Points

  • All pregnant women should be screened for Hepatitis B surface antigen (HBsAg) during first prenatal visit
  • High-risk women should be rescreened in third trimester
  • Vertical transmission risk is 90% without prophylaxis

Maternal and Fetal Complications

Maternal Effects

  • Acute hepatitis B during pregnancy increases risk of preterm labor, placental abruption, and maternal hemorrhage due to impaired liver function.
  • Chronic carriers may experience liver function deterioration during pregnancy due to increased metabolic demands.

Fetal/Neonatal Effects

  • Increased risk of preterm birth, low birth weight, and intrauterine growth restriction.
  • Without intervention, 90% of infants born to HBsAg-positive mothers will develop chronic hepatitis B infection.

Memory Aid: "BIRTH" for Hepatitis B Risks

Bleeding complications
Intrauterine growth restriction
Risk of vertical transmission
Transmission to baby
Hepatitis in newborn

Prevention and Management

Prenatal Management

  1. Screen all pregnant women for HBsAg at first prenatal visit
  2. Identify high-risk women: multiple sexual partners, IV drug use, healthcare workers
  3. Rescreen high-risk women in third trimester if initially negative
  4. Monitor liver function tests throughout pregnancy
  5. Coordinate with pediatric team for newborn prophylaxis planning

Delivery Considerations

  • Mode of delivery does not significantly affect transmission risk - vaginal delivery is acceptable unless other obstetric indications for cesarean exist.
  • Avoid fetal scalp electrodes, vacuum extraction, and forceps when possible to minimize fetal exposure to maternal blood.

Key Points

  • Cesarean section does NOT prevent vertical transmission
  • Breastfeeding is safe if infant receives proper prophylaxis
  • Standard precautions must be maintained during delivery

Newborn Prophylaxis Protocol

Immediate Interventions

  1. Hepatitis B immune globulin (HBIG) within 12 hours of birth
  2. First dose of hepatitis B vaccine within 12 hours of birth (separate injection site)
  3. Complete hepatitis B vaccine series at 1-2 months and 6 months
  4. Test for HBsAg and anti-HBs at 12-15 months to confirm immunity

Clinical Scenario

A 28-year-old woman at 38 weeks gestation tests positive for HBsAg. She delivers a healthy 3200g infant vaginally. What are the priority nursing interventions for the newborn?

Answer: Administer HBIG and hepatitis B vaccine within 12 hours, at separate injection sites. Document administration times and coordinate follow-up vaccine schedule.

Commonly Confused Points

Concept Correct Information Common Misconception
Delivery Method Vaginal delivery acceptable C-section prevents transmission
Breastfeeding Safe with proper infant prophylaxis Always contraindicated
Vaccine Timing Within 12 hours of birth Can wait until discharge
HBIG and Vaccine Different injection sites Can be given together in same site

Quick Check

  • ☐ Can you name the two medications given to prevent vertical transmission?
  • ☐ Do you know the timeframe for newborn prophylaxis?
  • ☐ Can you identify when to rescreen high-risk mothers?

Study Tips and Memory Aids

Memory Aid: "12-12 Rule"

Both HBIG and hepatitis B vaccine must be given within 12 hours of birth, but at 1-2 separate sites

Memory Aid: "Screen, Clean, Vaccine"

Screen: All pregnant women for HBsAg
Clean: Standard precautions during delivery
Vaccine: HBIG + vaccine within 12 hours

Common Pitfalls

  • Don't assume C-section prevents transmission - vertical transmission occurs primarily during delivery regardless of method
  • Don't delay newborn prophylaxis - effectiveness decreases significantly after 12 hours
  • Don't forget to rescreen high-risk women in third trimester if initially negative

Self-Assessment

  • ☐ I can explain why both HBIG and vaccine are needed for newborn prophylaxis
  • ☐ I understand the timing requirements for effective prevention
  • ☐ I know the difference between acute and chronic hepatitis B effects in pregnancy
  • ☐ I can identify appropriate delivery precautions

Remember: You're preparing to protect both mothers and babies from serious complications. Your knowledge of hepatitis B prevention protocols can make the difference in preventing lifelong chronic infection in newborns. Stay focused and confident - you've got this! 💪

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