In acetaminophen toxicity nurse observes:

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Medical Surgical Nursing

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

Acetaminophen overdose causes acute liver failure by producing a toxic metabolite (NAPQI) that destroys liver cells.
Damaged liver cells (hepatocytes) release enzymes, including Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST), into the blood.
A sharp rise in these transaminase levels is the hallmark laboratory finding used to diagnose and monitor the severity of acetaminophen-induced hepatotoxicity.
Levels can rise from normal (under 50 IU/L) to over 10,000 IU/L in severe cases, typically peaking 72-96 hours after ingestion.

Option B: Troponin is a protein released from damaged heart muscle cells. It is a specific marker for cardiac injury, not liver injury.
Option C: A complete blood count (CBC) provides general information about blood cells. It is not specific for liver damage and is not the primary test for monitoring acetaminophen toxicity.
Option D: An EEG measures electrical activity in the brain. While hepatic encephalopathy (a late complication of severe liver failure) can cause EEG changes, it is not an early or direct indicator of acetaminophen toxicity.

Clinical Relevance

Nursing practice connection: Knowing Laboratory Assessment in Acetaminophen Toxicity helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
The nurse's primary role is early identification and intervention. This includes assessing the time and amount of ingestion to help determine risk using the Rumack-Matthew nomogram.
Nurses are responsible for monitoring serial transaminase levels and other liver function tests (e.g., bilirubin, PT/INR) to track the progression of liver injury.
Prompt administration of the antidote, N-acetylcysteine (NAC), is a critical nursing intervention. NAC works by replenishing glutathione stores, which helps neutralize the toxic metabolite.

How to Approach the Question

First, identify the core subject of the question: 'acetaminophen toxicity'.
Recall or deduce the primary organ affected by acetaminophen overdose. Acetaminophen is well-known for its potential to cause severe liver damage (hepatotoxicity).
Review the options and determine which one directly measures the function or integrity of the liver.
Transaminase levels (AST/ALT) are enzymes concentrated in the liver, making them a direct marker of liver cell injury.
Eliminate the other options by linking them to their primary organ systems: Troponin (heart), CBC (blood/general), and EEG (brain). This confirms that transaminase levels are the most relevant observation.

Concept Tested & Keywords

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E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) pp. 205-207, 204-206