Tetanus prophylaxis in neet pg aspects
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tetanus prophylaxis NEET PG high yield points wound management 2024
I now have all the information needed for a comprehensive, high-yield NEET PG answer. Let me compile it:
Tetanus Prophylaxis - High-Yield NEET PG
1. Causative Organism & Mechanism
- Caused by Clostridium tetani - gram-positive, anaerobic, spore-forming bacillus
- Produces tetanospasmin (exotoxin) - blocks inhibitory neurotransmitters (GABA, glycine) at spinal interneurons → spastic paralysis
- Tetanus does NOT confer natural immunity (toxin concentration lethal before immune response) - a classic NEET PG fact
2. Classification of Wounds (KEY EXAM TABLE)
| Feature | Tetanus-Prone Wound | Non-Tetanus-Prone (Clean Minor) Wound |
|---|---|---|
| Age of wound | > 6 hours old | < 6 hours old |
| Depth | > 1 cm deep | Superficial |
| Contamination | Soil, feces, saliva, rust | Minimally contaminated |
| Tissue | Devitalized / necrotic tissue | No devitalized tissue |
| Type | Stellate, crush, explosion, burn, frostbite, puncture, animal bite | Clean laceration |
| Foreign body | Present | Absent |
Mnemonic for tetanus-prone wounds: "DASHED" - Devitalized tissue, Avascular/ischemic tissue, Soil/fecal contamination, Hours >6, Embedded foreign body, Deep puncture
3. Prophylaxis Decision Table (THE MOST IMPORTANT TABLE FOR NEET PG)
| Prior Tetanus Toxoid Doses | Clean Minor Wound | All Other Wounds (Tetanus-Prone) | ||
|---|---|---|---|---|
| Toxoid | TIG | Toxoid | TIG | |
| Unknown or <3 doses | YES | NO | YES | YES |
| ≥3 doses, last dose <5 yr | NO | NO | NO | NO |
| ≥3 doses, last dose 5-10 yr | NO | NO | YES | NO |
| ≥3 doses, last dose >10 yr | YES | NO | YES | NO |
The critical rule:
- TIG is ONLY given when: (a) Tetanus-prone wound AND (b) incomplete/unknown immunization (<3 doses)
- 5-year rule = tetanus-prone wounds get booster if last dose >5 years
- 10-year rule = clean wounds get booster if last dose >10 years
(Source: Tintinalli's Emergency Medicine; Harriet Lane Handbook; Miller's Review of Orthopaedics)
4. Prophylaxis Flowchart
5. Drugs Used - Doses (HIGH YIELD)
Active Immunization (Tetanus Toxoid)
| Vaccine | Age Group | Dose | Route |
|---|---|---|---|
| DTaP | < 7 years | 0.5 mL | IM |
| Tdap | ≥ 7 years (preferred) | 0.5 mL | IM |
| Td | Adults | 0.5 mL | IM |
- Primary series: 3 doses (0, 6 weeks, 12 months)
- Routine booster: every 10 years
Passive Immunization (TIG - Tetanus Immune Globulin)
| Indication | Dose |
|---|---|
| Prophylaxis | 250 units IM |
| Treatment (therapeutic) | 3000-6000 units IM |
- TIG = human tetanus immunoglobulin (preferred - no serum sickness)
- ATS (Equine Antitetanus Serum) = older, risk of anaphylaxis, 1500 IU IM for prophylaxis
- When both toxoid and TIG are given: use separate syringes at different sites
(Source: Park's Preventive & Social Medicine; Washington Manual; Roberts & Hedges' Clinical Procedures)
6. Contraindications to Tetanus Toxoid
- History of neurologic or severe systemic reaction after a previous dose
- Mild local reactions (erythema, induration, pain) are NOT contraindications
7. Antibiotics in Tetanus Prophylaxis (Park's - NEET PSM)
- Active immunization (toxoid) = ideal method but no immediate effect
- Penicillin: Benzathine penicillin 1.2 mega units IM (single dose) - covers 3-4 weeks
- Penicillin allergy: Erythromycin 500 mg 6-hourly × 7 days
- Must be given within 6 hours of injury (antibiotics kill vegetative forms, NOT spores)
- Antibiotics are NOT a substitute for immunization - only adjunct
8. Special Scenarios (Exam Favorites)
| Scenario | Management |
|---|---|
| Unimmunized patient, clean wound | Toxoid YES + TIG NO + complete primary series |
| Unimmunized patient, dirty wound | Toxoid YES + TIG YES |
| Fully immunized, last booster 3 years ago, dirty wound | Nothing needed (< 5 years) |
| Fully immunized, last booster 7 years ago, dirty wound | Toxoid YES + TIG NO |
| Fully immunized, last booster 12 years ago, clean wound | Toxoid YES (>10 years) |
| Burns >10% TBSA | 0.5 mL toxoid; if last booster >10 years or unknown → add TIG 250 units |
| Pregnant (unimmunized) | 2 doses TT between 16-36 weeks, ≥1 month apart, ≥3 weeks before delivery |
9. Neonatal Tetanus - Prevention
- "Five Cleans": Clean hands, clean delivery surface, clean blade, clean cord tie, clean cord stump (no application)
- Maternal TT during pregnancy protects neonates (transplacental IgG)
- Training birth attendants alone reduces neonatal tetanus deaths by 90%
10. Key One-Liners for MCQs
- Tetanus does NOT give natural immunity - most asked concept
- TIG dose for prophylaxis = 250 units IM; for treatment = 3000-6000 units
- 5-year rule for dirty wounds; 10-year rule for clean wounds (when booster needed)
- TIG and toxoid given at different sites simultaneously
- Preferred passive immunization = human TIG (not horse ATS - risk of serum sickness/anaphylaxis)
- Tetanus-prone wound: >6 hours old, devitalized tissue, contaminated, >1 cm deep
- Contraindication to toxoid = prior neurologic reaction (not local reaction)
- In children <7 years use DTaP; ≥7 years use Tdap (preferred) or Td
- Antibiotic prophylaxis: penicillin kills vegetative forms only, not spores
- Tdap preferred in adults who have never received it (also covers pertussis)
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