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Clinical Case 1: Hepatobiliary System Infections - Complete Answers
Case Recap
A 40-year-old woman with loss of appetite, nausea, vomiting, abdominal pain, persistent fatigue x12 days, history of multiple blood transfusions over 5 months, dark-coloured urine, elevated serum bilirubin and liver enzymes.
Q1. Provisional Clinical Diagnosis
Viral Hepatitis - most likely Hepatitis B (or Hepatitis C)
The student's answer is correct. The key clues are:
| Feature | Significance |
|---|---|
| Nausea, vomiting, loss of appetite, abdominal pain | Classic prodromal symptoms of acute viral hepatitis |
| Fatigue x 12 days | Consistent with hepatic inflammation |
| Multiple blood transfusions | Primary risk factor for HBV and HCV transmission |
| Dark urine (bilirubinuria) | Indicates conjugated hyperbilirubinaemia from liver injury |
| Elevated serum bilirubin + liver enzymes (ALT, AST) | Hepatocellular damage |
Blood transfusion is a well-recognised transmission route for parenterally transmitted hepatitis viruses. As noted in Park's Textbook of Preventive and Social Medicine, "Recipients of blood transfusions" are explicitly listed among high-risk groups for HBV infection, alongside health care workers, injecting drug users, and organ transplant recipients.
Q2. Etiological Agents
The student wrote "HBAV, HBBV, HBCV" - this is partially correct but contains errors in nomenclature. The correct answers are:
Primary agents transmitted by blood transfusion:
- Hepatitis B Virus (HBV) - DNA virus, Hepadnaviridae family; 42-nm "Dane particle"; spreads through blood, semen, body fluids
- Hepatitis C Virus (HCV) - RNA virus, Flaviviridae family; the most common transfusion-transmitted hepatitis since blood screening for HBsAg was introduced
- Hepatitis D Virus (HDV) - defective RNA virus; requires HBV co-infection; also blood-borne
Other hepatitis viruses (less relevant here, not transfusion-transmitted):
- Hepatitis A Virus (HAV) - faecal-oral route, not typically transmitted by blood transfusion
- Hepatitis E Virus (HEV) - primarily faecal-oral; rare transfusion transmission documented
Given the blood transfusion history, HBV and HCV are the most clinically relevant etiological agents in this case.
Q3. Laboratory Tests to Confirm the Diagnosis
This question was left blank by the student. Here is a complete answer:
A. Serological Tests for Hepatitis B
| Marker | What it indicates |
|---|---|
| HBsAg (Hepatitis B Surface Antigen) | Active HBV infection (acute or chronic); first marker to appear |
| Anti-HBc IgM | Acute HBV infection (window period marker) |
| Anti-HBc Total (IgG) | Past or chronic HBV infection |
| HBeAg | Active viral replication; high infectivity |
| Anti-HBe | Seroconversion; lower infectivity |
| Anti-HBs | Immunity (via vaccination or resolved infection) |
| HBV DNA (PCR) | Quantitative viral load; confirms active replication |
Interpretation guide (Tietz Textbook of Laboratory Medicine, 7th Edition):
- Acute hepatitis B: HBsAg+, Anti-HBc IgM+, HBeAg+
- Chronic active: HBsAg+, Anti-HBc IgG+, HBeAg+
- Resolved/immune: Anti-HBs+, Anti-HBc IgG+, HBsAg-
B. Serological Tests for Hepatitis C
- Anti-HCV antibody (ELISA/CLIA) - screening test; appears weeks after exposure
- HCV RNA by PCR - confirmatory; detectable within days to weeks post-exposure; used to confirm active infection and determine viral load
- HCV Genotyping - guides treatment selection
C. General Liver Function Tests (LFTs)
| Test | Expected finding in viral hepatitis |
|---|---|
| Serum ALT (SGPT) | Markedly elevated (most sensitive marker of hepatocellular injury) |
| Serum AST (SGOT) | Elevated (less specific) |
| Serum Bilirubin (total, conjugated, unconjugated) | Elevated conjugated bilirubin |
| Urine bilirubin & urobilinogen | Bilirubin present in urine (bilirubinuria) |
| Alkaline Phosphatase (ALP) | Mildly elevated |
| Prothrombin Time (PT/INR) | Prolonged in severe hepatitis (coagulopathy) |
| Serum Albumin | Decreased in chronic/severe disease |
| CBC | Leukopenia common in acute viral hepatitis |
D. Additional Tests
- Anti-HAV IgM - to rule out concurrent Hepatitis A
- Liver biopsy - for chronic hepatitis grading/staging (not needed for acute diagnosis)
- Ultrasound abdomen - assess liver size, echotexture, rule out biliary obstruction
Q4. Preventive Measures
The student noted "General measures - Prevent" but left it incomplete. Here is the full answer:
A. General (Non-Specific) Measures
- Strict screening of blood donors for HBsAg and anti-HCV before transfusion (most important given this case)
- Use of disposable needles and syringes; never reuse
- Proper sterilisation of medical instruments
- Universal precautions for healthcare workers (gloves, protective equipment)
- Avoid sharing razors, toothbrushes, or any blood-contaminated items
- Safe sex practices; condom use
B. Specific Measures for Hepatitis B
- Hepatitis B Vaccine (most important preventive measure):
- Schedule: 3 doses at 0, 1, and 6 months
- Immunisation of all high-risk groups: blood transfusion recipients, healthcare workers, dialysis patients, household contacts of HBsAg carriers, newborns of HBsAg-positive mothers
- Produces anti-HBs; protective level is ≥10 IU/mL
- Hepatitis B Immunoglobulin (HBIG) - for post-exposure prophylaxis (needle-stick, newborns of HBsAg-positive mothers)
- Universal newborn vaccination - recommended in HBV-endemic regions
C. Specific Measures for Hepatitis C
- No vaccine available for HCV
- Prevention relies entirely on interrupting blood-borne transmission: strict blood screening, harm reduction in intravenous drug users (needle exchange programmes), safe injection practices
- Direct-acting antiviral (DAA) therapy for infected individuals reduces transmission
Sources: Park's Textbook of Preventive and Social Medicine; Tietz Textbook of Laboratory Medicine, 7th Edition; Sleisenger and Fordtran's Gastrointestinal and Liver Disease
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