PEP (Post-exposure prophylaxis) after needle-stick injury should be initiated within:

AIIMS CRE 2025

Medical & Surgical Nursing

Easy

Appeared in: AIIMS CRE 2025

Explanation

Post-Exposure Prophylaxis (PEP) for HIV is a critical emergency intervention following a potential occupational exposure.
The established therapeutic window for initiating PEP is up to 72 hours after the exposure.
Animal studies show that after 72 hours, the virus begins to replicate in regional lymph nodes, and the effectiveness of PEP significantly diminishes.
While the absolute deadline is 72 hours, guidelines stress that PEP should be started as soon as possible, preferably within hours, as its efficacy decreases over time.

Option A: While starting PEP within 1 hour is ideal and provides the best chance of preventing infection, it is not the maximum time limit. The question asks for the window within which it should be initiated, which implies the maximum acceptable timeframe.
Option B: Starting PEP within 24 hours is highly effective and recommended, but it does not represent the full extent of the therapeutic window. A healthcare worker still has the option to start PEP after 24 hours.
Option D: Starting PEP after 7 days (168 hours) is considered ineffective. By this point, if transmission has occurred, the virus has likely established a systemic infection, and PEP will not prevent it.

Visual 1: Timeline Infographic. A horizontal timeline showing the 72-hour window for PEP initiation after a needle-stick injury, highlighting that 'sooner is better' and marking the 72-hour point as the 'cut-off'.
Visual 2: Flowchart. A step-by-step flowchart illustrating the management protocol for a needle-stick injury in a healthcare setting, from immediate first aid to reporting, source patient testing, and PEP decision-making.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing Post-Exposure Prophylaxis (PEP) Timing for HIV in the correct sequence, documenting the action clearly, and monitoring for the expected response.
Every hour counts. Nurses must understand the extreme urgency of reporting a needle-stick or other potential exposure immediately to enable prompt evaluation and initiation of PEP.
Patient counseling is key. The nurse must be prepared to explain the risks, benefits, and side effects of the 28-day PEP regimen to the exposed individual to ensure adherence.
What if the source patient's HIV status is unknown? In this case, the decision to start PEP is based on a risk assessment of the exposure type and the local prevalence of HIV. PEP is often started pending the source's test results and can be discontinued if the source is confirmed negative.

How to Approach the Question

First, identify the core of the question: it's asking for a specific time frame related to a medical protocol (PEP).
Recognize that this is a factual recall question based on established healthcare guidelines (e.g., from NACO or CDC).
Scan the options. They are all different timeframes. You need to recall the maximum window for PEP initiation.
Differentiate between the 'ideal' time (as soon as possible) and the 'maximum allowable' time. The question's wording 'should be initiated within' refers to this maximum window.
Recall that PEP for HIV is ineffective after a certain point. The standard cutoff is 72 hours.
Select the option that matches this established guideline.

Concept Tested & Keywords

Concept Tested: Post-Exposure Prophylaxis (PEP) Timing for HIV
Stem keywords: PEP, Post-exposure prophylaxis, needle-stick injury, initiated within
Lead-in keywords: initiated within

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