Which of the following drugs, when used for a long time, can alter the normal gut flora and increase the likelihood of Clostridioides difficile growth, leading to chronic diarrhoea?

1. A

   Diabetic drugs

2. B

   Antibiotics

3. C

   Psychiatric drugs

4. D

   Analgesics

Appeared in: NHM UP Staff Nurse-2023 Shift-2nd

Explanation

• Antibiotics, particularly broad-spectrum types, kill both harmful and beneficial bacteria in the gastrointestinal tract.
• This disruption of the normal gut microbiome (dysbiosis) reduces the natural defense against opportunistic pathogens.
• With less competition, the spore-forming bacterium Clostridioides difficile can proliferate and release toxins.
• These toxins cause inflammation of the colon (colitis) and lead to characteristic symptoms of severe, watery diarrhea.

Why Other Options Were Wrong

• Option A: While some diabetic drugs like metformin can cause diarrhea as a side effect, they do not cause it by destroying the gut flora to the extent that it promotes C. difficile overgrowth.
• Option C: Psychiatric drugs primarily affect neurotransmitters in the brain and are not known to have antimicrobial properties that would alter gut flora and lead to C. difficile infection.
• Option D: Opioid analgesics are a major cause of constipation by slowing gut motility. Non-steroidal anti-inflammatory drugs (NSAIDs) can cause GI irritation and bleeding, but neither class works by disrupting the gut microbiome to cause C. diff.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology: Adverse effects of antibiotics and Clostridioides difficile infection as background academic context rather than a clinical decision trigger.
• Nurses play a crucial role in antibiotic stewardship, which includes questioning the need for antibiotics and ensuring they are used for the shortest effective duration.
• Patient education is vital. Nurses must instruct patients taking antibiotics to report the onset of frequent, watery diarrhea to their healthcare provider immediately.
• In any healthcare setting, the new onset of diarrhea in a patient who has recently received antibiotics should be treated as suspected C. difficile until proven otherwise, and appropriate infection control measures must be initiated.

How to Approach the Question

• Analyze the question to identify the key mechanism: a drug that 'alters the normal gut flora' leading to a specific infection, 'Clostridioides difficile'.
• Recall the primary function of each drug class in the options.
• Evaluate 'Antibiotics'. Their purpose is to kill bacteria. This directly aligns with the mechanism of altering gut flora. The link between antibiotics and C. diff is a fundamental concept in pharmacology and infection control.
• Evaluate the other options. Diabetic drugs manage blood sugar, psychiatric drugs affect neurotransmitters, and analgesics relieve pain. None of these have a primary antimicrobial function.
• Conclude that antibiotics are the only class listed that directly causes the pathophysiology described in the question stem, making it the correct answer.

Concept Tested & Keywords

• Concept Tested: Pharmacology: Adverse effects of antibiotics and Clostridioides difficile infection.
• Stem keywords: long time, alter normal gut flora, Clostridioides difficile, chronic diarrhoea, drugs
• Lead-in keywords: Which

Question ID

QnPtK3zSMb9dxlvXjPrFpP

Copy ID

Reference Book

E6 Nursing Fundamentals Taylor p. 616-618

E6 Medicine Harrison 22e Part 2 p. 1738-1740