Prophylaxis needle prick injury
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"needlestick injury"[MeSH Terms] AND "post-exposure prophylaxis"[MeSH Terms]
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Here is a complete, textbook-sourced reference guide on Post-Exposure Prophylaxis (PEP) for Needle Prick/Needlestick Injury:
Post-Exposure Prophylaxis (PEP) for Needle Prick Injury
1. Immediate Steps (First Aid)
- Wound care first - wash immediately with soap and water; do NOT squeeze or suck the wound
- Flush mucous membranes (eyes/mouth) with water or saline if exposed
- Such wounds rarely require closure
- Report immediately to occupational health / emergency department
- Evaluate both the source patient and the exposed worker
2. Risk of Infection (Transmission Rates)
| Pathogen | Risk per needlestick |
|---|---|
| HBV (HBsAg+, HBeAg+) | 23-62% |
| HBV (HBsAg+, HBeAg-) | 1-6% |
| HCV | ~1.8% (range 0-7%) |
| HIV | ~0.3% percutaneous; ~0.09% mucous membrane |
Factors increasing HIV seroconversion risk:
- Deep injury (OR 15)
- Visible blood on device (OR 6.2)
- Needle used in source patient's artery/vein (OR 4.3)
- Source patient with terminal AIDS (OR 5.6)
3. PEP by Pathogen
A. HIV PEP
Indication: Exposure to HIV-infected blood, tissue, or body fluids via percutaneous injury, mucous membrane contact, or non-intact skin.
Timing: Start as soon as possible - ideally within 1 hour, must be within 72 hours (may consider up to 1 week only in very-high-risk cases). Efficacy diminishes with delay.
Duration: 28 days (4 weeks) continuous therapy
Preferred Regimen (per Goldman-Cecil Medicine & Washington Manual):
- Tenofovir disoproxil fumarate/Emtricitabine (TDF/FTC) 300/200 mg orally once daily
- + Raltegravir 400 mg orally twice daily (or Dolutegravir as alternative)
In the ED: Prescribe first 3-day starter pack, then arrange outpatient follow-up within 72 hours with infectious disease.
HIV Testing Schedule:
- Baseline, 6 weeks, 12 weeks, and 6 months
- (Or baseline, 6 weeks, and 4 months if using 4th-generation test)
When NOT to start HIV PEP:
- Low-risk exposure (trivial puncture from unknown community needle)
- Care sought >72 hours after exposure
- Source patient tests HIV-negative on rapid test
B. Hepatitis B (HBV) PEP
Timing: HBIG should be given within 24 hours (maximally effective); effectiveness diminishes by 96 hours.
| Vaccination Status of Exposed Worker | Source HBsAg+ | Action |
|---|---|---|
| Unvaccinated | Positive | HBIG 0.06 mL/kg IM within 96 h + start HBV vaccine series |
| Vaccinated - known responder (anti-HBs ≥10 mIU/mL) | Positive | No treatment needed |
| Vaccinated - non-responder after 1 series | Positive | HBIG x1 + repeat full vaccine series |
| Vaccinated - non-responder after 2 series | Positive | HBIG x2 doses (1 month apart) |
| Vaccinated - antibody response unknown | Positive | Check anti-HBs; if ≥10 IU/mL: no therapy; if <10 IU/mL: HBIG x1 + vaccine booster |
| Any | Source unknown | Based on risk assessment |
Note: HBV retains infectivity at room temperature for at least 7 days after drying.
C. Hepatitis C (HCV) - NO PEP Available
- No effective post-exposure prophylaxis for HCV exists
- Immunoglobulin is NOT recommended
- Treatment is monitoring only
HCV Follow-up Protocol:
- Baseline HCV RNA + aminotransferases
- Repeat at weeks 2, 4, and 6 months
- Anti-HCV antibody at baseline and 4-6 months
- If HCV seroconversion confirmed, refer for antiviral treatment (direct-acting antivirals are highly effective for acute HCV)
4. Tetanus Prophylaxis
Consider tetanus prophylaxis based on:
- Patient age and immunization history
- Severity of injury
- Potential for soil/dirt contamination on needle
Use Tdap (preferred if pertussis status unknown/not current) or Td. Give Tetanus Immune Globulin (TIG) if indicated.
5. Source Patient Testing
All blood/body fluid exposures should be reported to occupational health. The source patient should be tested (with consent) for:
- HIV (rapid test ideal - reduces unnecessary PEP)
- HBsAg
- HCV antibody
6. Non-Occupational (Community) Needlestick
Community needlestick injuries (found needles, discarded syringes) carry lower risk than occupational injuries because:
- Time elapsed since last use (virus drying/degradation)
- HIV susceptible to air exposure - 50% TCID decreases by ~1 log per 9 hours
- Needles rarely contain fresh blood
- Injuries usually superficial
No confirmed HIV transmissions from accidental community needlestick injuries in the US to date. ARVs generally should not be started if risk is trivial or care is sought >72 hours.
7. Consult / Helpline
National Clinicians' Post-Exposure Prophylaxis Hotline (PEPLine):
- Phone: 1-888-448-4911 (available 9 AM - 2 AM ET)
- Web: nccc.ucsf.edu/clinician-consultation/pep-post-exposure-prophylaxis
Sources: Tintinalli's Emergency Medicine; Goldman-Cecil Medicine; Washington Manual of Medical Therapeutics; Red Book 2021 (AAP); Roberts & Hedges' Clinical Procedures in Emergency Medicine
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