RAK Nursing Officer - 2019
Pharmacology
Medium
What would you monitor in a patient taking high dose of acetaminophen over prolonged period?
Appeared in: RAK Nursing Officer - 2019
Explanation
- Acetaminophen is primarily metabolized in the liver, making it the organ most susceptible to toxicity from overdose or chronic high-dose use.
- High doses saturate normal metabolic pathways, leading to the production of a toxic metabolite, NAPQI, which causes hepatocellular injury.
- Monitoring liver enzymes, specifically Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST), is the most direct and sensitive way to detect early liver damage from acetaminophen.
- Signs of hepatotoxicity include nausea, vomiting, abdominal pain, and jaundice, which are assessed alongside laboratory tests.
Why Other Options Were Wrong
- Option A: Prothrombin time (PT) reflects the liver's synthetic function (ability to make clotting factors). It becomes prolonged only in severe, advanced liver failure. It is not a sensitive marker for the early, acute liver cell injury caused by acetaminophen toxicity.
- Option B: GI irritation is not a primary side effect of acetaminophen. This side effect is characteristic of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) like ibuprofen, naproxen, and aspirin, which inhibit prostaglandins that protect the stomach lining.
- Option D: While very high doses or chronic abuse of analgesics can lead to kidney damage (analgesic nephropathy), the primary, most acute, and life-threatening toxicity of acetaminophen is to the liver (hepatotoxicity).
Related Visual
Clinical Relevance
- Nursing practice connection: Use the key finding related to Monitoring for adverse effects of pharmacotherapy to guide bedside assessment, documentation, and the next nursing action.
- Nurses must educate patients about the maximum daily dose of acetaminophen (typically 4 grams/day for adults, but often lower for chronic use) and the dangers of 'hidden' acetaminophen in combination cold and flu products.
- It is a critical nursing responsibility to assess for risk factors for hepatotoxicity, such as chronic alcohol use, malnutrition, or pre-existing liver disease, as these lower the threshold for toxicity.
- The antidote for acetaminophen overdose, N-acetylcysteine (NAC), is most effective when given within 8 hours of ingestion, highlighting the importance of early recognition and intervention.
How to Approach the Question
- First, identify the key elements of the question: the drug is 'acetaminophen', the dose is 'high', and the duration is 'prolonged'.
- Recall the primary organ system associated with the metabolism and toxicity of acetaminophen. This is a core piece of pharmacological knowledge.
- Recognize that acetaminophen is well-known for its potential to cause liver damage (hepatotoxicity).
- Evaluate the given options in this context. 'Liver function' directly relates to the primary organ of concern.
- Rule out the other options by considering their relevance. Prothrombin time is a later sign, GI irritation is linked to NSAIDs, and kidney function is a secondary concern compared to the acute liver risk.
Concept Tested & Keywords
- Concept Tested: Monitoring for adverse effects of pharmacotherapy
- Stem keywords: acetaminophen, high dose, prolonged period, monitor
- Lead-in keywords: What would you monitor
- Clinical cues: High dose of acetaminophen suggests a risk for toxicity.
- Negative lead-in flag: false
Question ID
QbOFeOacgFRuM5yl9AQehv
Reference Book
E6 Physiology Guyton 4SAE Part 2A p. 185-187
E6 Harper's Illustrated Biochemistry2023 (pp 26-793 of 813) p. 558-560
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 329-331
Practise the full RAK Nursing Officer - 2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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