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Hepatitis A-E | 마이메르시 MyMerci
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Hepatitis A-E

NCLEX Review Guide: Hepatitis A-E

Hepatitis Overview

Types and Transmission

  • Hepatitis A (HAV): Fecal-oral transmission through contaminated food, water, or direct contact with infected person
  • Hepatitis B (HBV): Blood-borne pathogen transmitted through sexual contact, blood transfusions, needle sharing, and perinatal transmission
  • Hepatitis C (HCV): Blood-borne pathogen primarily transmitted through IV drug use, blood transfusions (pre-1992), and healthcare exposures
  • Hepatitis D (HDV): Co-infection with Hepatitis B - cannot exist without HBV presence
  • Hepatitis E (HEV): Fecal-oral transmission similar to HAV, more common in developing countries

Memory Aid: "ABCDE Transmission"

A & E = Ate (fecal-oral route)
B, C, D = Blood/Body fluids

Key Points

  • HAV and HEV are acute infections with no chronic form
  • HBV, HCV, and HDV can become chronic infections
  • Universal precautions required for all hepatitis types

Clinical Manifestations

Signs and Symptoms

  • Prodromal phase: Fatigue, malaise, anorexia, nausea, vomiting, and right upper quadrant pain
  • Icteric phase: Jaundice (yellowing of skin and sclera), dark urine, clay-colored stools
  • Recovery phase: Gradual improvement of symptoms, appetite returns, energy levels increase

Clinical Scenario

A 28-year-old patient presents with fatigue, nausea, and yellow discoloration of eyes. Lab results show elevated ALT (400 U/L) and AST (380 U/L). Patient reports recent travel to Mexico and eating street food.

Most likely diagnosis: Hepatitis A

Key Points

  • Elevated liver enzymes (ALT, AST) are hallmark findings
  • Bilirubin levels correlate with degree of jaundice

Diagnostic Testing

Hepatitis Serology Comparison

Type Acute Infection Chronic/Past Infection Immunity
HAV IgM anti-HAV (+) N/A IgG anti-HAV (+)
HBV HBsAg (+), IgM anti-HBc (+) HBsAg (+), IgG anti-HBc (+) Anti-HBs (+)
HCV Anti-HCV (+), HCV RNA (+) Anti-HCV (+), HCV RNA (+) No long-term immunity

Key Points

  • IgM indicates acute infection, IgG indicates past infection or immunity
  • HBsAg presence indicates active HBV infection

Nursing Management

Nursing Interventions

  1. Implement standard precautions for all patients; contact precautions for HAV during first 2 weeks of illness
  2. Monitor liver function tests, coagulation studies, and electrolyte levels closely
  3. Provide supportive care: rest, adequate nutrition, hydration
  4. Educate on activity restrictions: avoid alcohol, hepatotoxic medications
  5. Monitor for complications: fulminant hepatitis, hepatic encephalopathy

Memory Aid: "LIVER Care"

Lab monitoring
Isolation precautions
Vitamins and nutrition
Education on prevention
Rest and recovery

Key Points

  • No specific antiviral treatment for HAV and HEV
  • HBV and HCV may require antiviral therapy in chronic cases
  • Avoid acetaminophen and alcohol to prevent further liver damage

Prevention and Vaccination

Immunization Guidelines

  • Hepatitis A vaccine: Two-dose series, recommended for travelers, high-risk groups
  • Hepatitis B vaccine: Three-dose series, universal vaccination for infants, healthcare workers
  • Post-exposure prophylaxis: HAV - immunoglobulin within 2 weeks; HBV - HBIG and vaccine within 24-48 hours

Important Alert

Healthcare workers with occupational exposure to blood must receive HBV vaccination series and annual titer checks

Key Points

  • No vaccines available for HCV, HDV, or HEV
  • Hand hygiene is primary prevention for HAV and HEV

Commonly Confused Points

HAV vs HBV vs HCV Comparison

Feature Hepatitis A Hepatitis B Hepatitis C
Transmission Fecal-oral Blood, sexual, perinatal Blood (mainly IV drugs)
Chronic form No Yes (5-10%) Yes (75-85%)
Vaccine available Yes Yes No
Incubation period 15-45 days 45-180 days 14-180 days

Common Pitfalls

  • Don't confuse HDV with an independent infection - it requires HBV co-infection
  • Remember: HAV IgM = acute, IgG = immunity/past infection
  • HCV has no vaccine and high chronicity rate

Quick Check Self-Assessment

  • ☐ I can differentiate transmission routes for each hepatitis type
  • ☐ I understand which hepatitis types become chronic
  • ☐ I know appropriate isolation precautions for each type
  • ☐ I can interpret basic hepatitis serology results
  • ☐ I understand vaccination schedules and post-exposure prophylaxis

Remember: You're building the foundation to protect and heal others. Every concept you master brings you closer to becoming the nurse your patients need. Keep going - you've got this! 💪

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