Which statement about post-exposure prophylaxis is true?

AIIMS CRE 2025

Medical Surgical Nursing

Easy

Appeared in: AIIMS CRE 2025

Explanation

Post-Exposure Prophylaxis (PEP) is an emergency medical intervention to prevent HIV infection after a potential exposure.
Its effectiveness is critically time-dependent. It must be started as soon as possible, and no later than 72 hours (3 days) after the exposure.
The rationale for this window is that the HIV virus begins to replicate in regional lymph nodes within 48 to 72 hours. PEP aims to stop this replication before the infection becomes established systemically.
While the window is 72 hours, efficacy is highest when started within the first few hours post-exposure.

Option A: PEP is ineffective if started one month after exposure. By this time, if transmission occurred, the virus would have already established a permanent, systemic infection, making prophylaxis futile.
Option C: Antiretroviral drugs used in PEP are potent medications and are associated with a range of side effects. Common ones include nausea, vomiting, fatigue, and headache. Patients must be counseled about these potential effects.
Option D: PEP is a short-term, fixed-duration treatment, typically lasting for 28 days (4 weeks). It is not a lifelong therapy.

Visual 1: Infographic: A timeline illustrating the critical 72-hour window for initiating PEP after an exposure, emphasizing that 'sooner is better' and showing the 28-day duration of the medication course.
Visual 2: Table: A comparative chart distinguishing between Post-Exposure Prophylaxis (PEP), Pre-Exposure Prophylaxis (PrEP), and Antiretroviral Therapy (ART) based on their purpose, timing of use, and duration of treatment.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Post-Exposure Prophylaxis (PEP) for HIV as background academic context rather than a clinical decision trigger.
Nurses are often the first point of contact for individuals with potential HIV exposure. Rapid assessment of the exposure type and timing is crucial to determine eligibility for PEP and initiate it promptly.
Patient education is a key nursing role. This includes explaining the rationale for the 28-day regimen, the importance of strict adherence, managing potential side effects, and the need for follow-up testing.
In the Indian context, increasing awareness and ensuring accessibility of PEP at designated centers (like ART centers) is a public health priority, especially for healthcare workers and high-risk populations.

How to Approach the Question

First, identify the core concept of the question, which is Post-Exposure Prophylaxis (PEP) for HIV.
The question asks for a 'true' statement. This requires you to evaluate each option based on your factual knowledge of PEP.
Analyze Option A (1 month): PEP is an emergency measure. A 1-month delay is far too long for it to be effective. Eliminate this option.
Analyze Option B (72 hours): This is the widely known critical time window for initiating PEP. This is a strong candidate for the correct answer.
Analyze Option C (no side effects): Recall that antiretroviral medications are powerful drugs with known side effects like nausea and fatigue. It's highly unlikely they have 'no' side effects. Eliminate this option.
Analyze Option D (lifelong): Lifelong therapy (ART) is for treating an established HIV infection. PEP is a short-term preventive course. Eliminate this option.

Concept Tested & Keywords

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