Needlestick with an Unknown Source Patient
A night-shift nurse sustains a hollow-bore needlestick while recapping a needle after drawing blood from an unresponsive patient in the emergency department. The patient has no identification and is intubated. The nurse's hepatitis B surface antibody titer from 3 years ago was 45 mIU/mL after a complete vaccine series. The nurse is 28 weeks pregnant. The source patient's blood is sent for HIV, HCV, and HBV testing; results will not be available for 24-48 hours. The nurse is anxious and asks whether she should start medications now or wait. The occupational health clinic is closed until morning.
1. What is the appropriate immediate management of this exposure, and what should happen before the source results return?
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Immediate steps: wash the wound with soap and water (no scrubbing, no caustic agents), and report the exposure. The exposure should be risk-stratified: hollow-bore needle, likely venous blood, percutaneous - a higher-risk exposure.
The nurse's HBV status is protective (anti-HBs 45 mIU/mL, above the 10 mIU/mL threshold), so no HBV post-exposure prophylaxis is indicated; document the titer.
For HIV, current guidance supports starting PEP as soon as possible after a higher-risk exposure, ideally within hours and no later than 72 hours, without waiting for source results when the source is unknown and the exposure is high-risk. A three-drug regimen is recommended for higher-risk exposures. Because the nurse is pregnant, regimen selection should favor agents with established safety data (e.g., tenofovir/emtricitabine plus raltegravir or dolutegravir), and obstetric consultation should be arranged. For HCV, no PEP exists; baseline testing and follow-up are appropriate.
The clinic being closed is not an acceptable reason to delay; the IP/occupational health should activate the on-call pathway.
2. How should the source patient's unknown status and the pregnancy influence the decision to start PEP?
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Unknown source status does not mean low risk; it means the risk is uncertain, and in a higher-risk percutaneous exposure the default is to start PEP promptly and reassess when results return. If the source is later confirmed HIV-negative, PEP can be stopped. Starting and stopping is safer than delaying and missing the window.
Pregnancy is not a contraindication to HIV PEP and does not justify withholding it. It does change regimen selection: prefer agents with the most reassuring pregnancy data, coordinate with obstetrics, and counsel the nurse about the rationale. The nurse's autonomy and anxiety should be addressed with clear information about what is known, what is not, and the plan for reassessment.
Documentation should capture the exposure details, the risk assessment, the decision and its rationale, and the follow-up schedule (HIV testing at baseline, 4-6 weeks, and 3-6 months; HCV RNA at baseline and follow-up; counseling about symptoms).
3. What system-level factors does this case reveal, and what should the IP recommend?
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The case reveals several system vulnerabilities: (1) recapping a needle - a practice that should be eliminated through safety-engineered devices and training; (2) an occupational health pathway that is unavailable at night, forcing a delay; (3) an unidentified, intubated source patient, which complicates source testing and consent.
Recommendations: audit and reinforce sharps safety, including availability and use of safety-engineered needles and sharps containers at point of use; establish a 24/7 exposure hotline or on-call occupational health coverage with a written protocol for starting PEP without delay; create a process for source testing when the patient cannot consent (institutional policy consistent with law, often permitting testing in occupational exposure contexts); and track exposures as a quality metric with feedback to units. The IP should also verify that the nurse's HBV titer is documented in the occupational health record and that a process exists for periodic review of immunity status for staff.