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Difficulty: MediumInfectious Diseases

A 26-year-old medical resident sustains a deep percutaneous injury with a hollow-bore needle while drawing blood from a patient. The source patient has a known history of HIV infection and is noncompliant with antiretroviral therapy, with a recent viral load of 150,000 copies/mL. The incident occurs on the medical ward. Arrange the following steps in the most appropriate chronological order for the management of the resident's exposure.

  1. 1Wash the puncture site vigorously with soap and water.
  2. 2Report to occupational health for baseline serology and exposure risk assessment.
  3. 3Initiate a three-drug antiretroviral post-exposure prophylaxis regimen.
  4. 4Conduct follow-up HIV serologic testing at 6 weeks, 12 weeks, and 6 months.

Answer

The correct sequence is to first wash the wound with soap and water, then report to occupational health for baseline serology and risk assessment, followed by initiating a three-drug antiretroviral post-exposure prophylaxis regimen, and finally conducting follow-up HIV serologic testing at 6 weeks, 12 weeks, and 6 months.
The management of an occupational needlestick injury follows a specific chronological protocol to maximize safety and prophylactic efficacy. First, immediate decontamination by washing with soap and water reduces the viral inoculum. Second, the healthcare worker must present to occupational health or the emergency department to document the injury, assess the risk level, and draw baseline serology. Third, based on the high-risk nature of the exposure, a three-drug antiretroviral post-exposure prophylaxis (PEP) regimen is prescribed and must be taken as soon as possible (ideally within 1-2 hours). Finally, because seroconversion may take months, serial follow-up testing is scheduled over a 6-month period.

Step-by-Step Solution

1
Wash the puncture site vigorously with soap and water.
Immediate mechanical reduction of the viral inoculum at the site of injury.
This is the critical first-aid intervention that must be performed locally before seeking formal medical care or leaving the immediate vicinity.
2
Report to occupational health for baseline serology and exposure risk assessment.
Documentation of the exposure, assessment of the risk level, and collection of baseline HIV serology from the exposed worker.
A formal medical evaluation is required to confirm the indication for prophylaxis, select appropriate agents, and establish a pre-exposure baseline.
3
Initiate a three-drug antiretroviral post-exposure prophylaxis regimen.
Systemic prevention of viral replication and integration.
For a high-risk exposure (e.g., hollow-bore needle, high viral load), a 3-drug regimen must be started as soon as possible, ideally within 1 to 2 hours, to maximize efficacy.
4
Conduct follow-up HIV serologic testing at 6 weeks, 12 weeks, and 6 months.
Long-term monitoring for delayed seroconversion.
Baseline testing only demonstrates pre-exposure status; serial testing is required because the window period for seroconversion extends over several months.

Key Concept

The management of high-risk occupational HIV exposure requires a strict sequential approach: immediate local wound decontamination, followed by risk assessment and baseline testing, prompt initiation of a 3-drug post-exposure prophylaxis (PEP) regimen, and structured long-term serologic follow-up.
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Infectious Diseases

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