ESIC Nursing Officer -2019 (Shift -1)
Pharmacology
Medium
In a patient taking high doses of acetaminophen over a prolonged period, the parameter to be monitored regularly is:
Appeared in: ESIC Nursing Officer -2019 (Shift -1)
Explanation
- Acetaminophen is primarily metabolized in the liver, making it the main organ at risk for toxicity from high-dose or prolonged use.
- Overuse of acetaminophen depletes the liver's supply of glutathione, leading to the accumulation of a toxic metabolite (NAPQI) that directly damages liver cells (hepatocytes).
- Therefore, regular monitoring of liver function tests (LFTs), which measure enzymes like ALT and AST released by damaged liver cells, is the most critical and sensitive way to detect early signs of liver injury.
Why Other Options Were Wrong
- Option A: Significant GI irritation is not a characteristic side effect of acetaminophen. It has a different mechanism of action than drugs that typically cause stomach upset.
- Option B: While acute kidney injury can occur, it is a much less common complication of acetaminophen toxicity, typically seen only in cases of severe overdose along with liver failure. The liver is the primary organ of concern.
- Option D: Prothrombin time (PT) measures the liver's ability to produce clotting factors. A prolonged PT is a sign of significant, advanced liver dysfunction, not an early indicator of liver cell injury. ALT and AST levels rise much earlier.
Related Visual
- Visual 1: Flowchart: Illustrating the metabolic pathway of acetaminophen in the liver, showing both the normal safe pathway and the toxic NAPQI pathway that becomes active in overdose.
- Visual 2: Comparison Table: Visually comparing the primary side effects and monitoring parameters for Acetaminophen vs. NSAIDs (e.g., Ibuprofen).
- Visual 3: Graph: Showing the typical time course of ALT/AST elevation and clinical symptoms following an acute acetaminophen overdose.
Clinical Relevance
- Nursing practice connection: Use the key finding related to Pharmacological monitoring for drug-induced organ toxicity, specifically acetaminophen hepatotoxicity to guide bedside assessment, documentation, and the next nursing action.
- Nurses have a critical role in patient education regarding the maximum daily dose of acetaminophen (4 grams for most adults) and the dangers of 'double-dipping' with combination cold and pain products that also contain acetaminophen.
- It is essential to assess for and warn patients about the increased risk of liver toxicity when taking acetaminophen concurrently with alcohol.
- What if the patient reports chronic alcohol use? The risk of acetaminophen-induced liver injury is significantly higher, and the recommended maximum daily dose is lower (often 2 grams/day). The nurse must assess for alcohol use and provide appropriate warnings.
How to Approach the Question
- First, identify the specific drug mentioned in the question: 'acetaminophen'.
- Recall the primary organ responsible for metabolizing this drug. For acetaminophen, this is the liver.
- Connect the organ of metabolism and potential toxicity (liver) to the corresponding laboratory tests used for monitoring (liver function tests).
- Evaluate the distractor options. Recognize that GI irritation and kidney issues are more characteristic of NSAIDs, and that Prothrombin Time is a marker of more advanced liver failure, not early monitoring.
Concept Tested & Keywords
- Concept Tested: Pharmacological monitoring for drug-induced organ toxicity, specifically acetaminophen hepatotoxicity.
- Stem keywords: acetaminophen, high doses, prolonged period, monitored regularly
- Lead-in keywords: parameter to be monitored
- Negative lead-in flag: false
Question ID
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Practise the full ESIC Nursing Officer -2019 (Shift -1)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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