RTA Antibiotics

Here’s a concise summary with rationale for antibiotic use in road traffic accidents (RTA):
1. Open Fractures

• Type I–II: Cefazolin (1st-gen cephalosporin).
  🔹 Rationale: covers skin flora (Staph/Strep); adequate for low-contamination injuries.
• Type III (severe, contaminated): Cefazolin + Gentamicin ± Metronidazole.
  🔹 Rationale: add Gram-negative + anaerobic cover due to high contamination risk.

2. Abdominal Trauma

• 3rd-gen cephalosporin (e.g., Ceftriaxone) + Metronidazole
  OR Piperacillin–Tazobactam alone.
  🔹 Rationale: broad Gram-negative and anaerobic coverage for bowel injuries.

3. Head Trauma

• Closed injury: No prophylaxis.
• Open/penetrating: Cefazolin or Ceftriaxone ± Vancomycin.
  🔹 Rationale: cover skin flora and prevent CNS infection with open wounds.

4. Chest Trauma

• Closed injury / chest tube only: No prophylaxis.
• Penetrating: Cefazolin or Cefuroxime.
  🔹 Rationale: prevent empyema/infection from skin flora.

5. Soft Tissue / Crush Injuries

• Cefazolin ± Metronidazole if gross contamination.
  🔹 Rationale: basic Gram-positive cover; add anaerobic cover when soil/devitalized tissue present.

6. Burns

• No systemic prophylaxis (use topical agents; systemic only if infection).
  🔹 Rationale: prophylaxis does not reduce infection or mortality; promotes resistance.

General Rules

• Single agent (Cefazolin) → adequate for most simple, clean, or mildly contaminated injuries.
• Dual/Triple therapy → reserve for severe contamination, abdominal penetration, or high-risk open fractures.
• Duration: Single perioperative dose to ≤48h (unless established infection).

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Principle:

• Use narrow, short-course prophylaxis where possible.
• Escalate only if gross contamination or visceral injury.