A conscious and alert adult is brought to the emergency department 30 minutes after ingesting an unknown quantity of sustained-release tablets. The patient is hemodynamically stable. Which gastrointestinal decontamination method is most likely to be considered for this patient?

1. A

   Inducing emesis with syrup of ipecac

2. B

   Administering a single dose of activated charcoal

3. C

   Performing whole-bowel irrigation with polyethylene glycol

4. D

   Initiating gastric lavage with a large-bore orogastric tube

Appeared in: NORCET 1 - 2020

Explanation

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• Whole-bowel irrigation (WBI) is the indicated method for flushing out sustained-release or enteric-coated tablets from the entire gastrointestinal tract.
• These formulations release drugs slowly over an extended period, making methods that only target the stomach (like lavage) or provide a single dose of adsorbent (like single-dose charcoal) less effective.
• WBI uses a large volume of polyethylene glycol solution to mechanically cleanse the bowel, physically removing the tablets before the full toxic dose can be absorbed.
• It is particularly useful for substances not well adsorbed by activated charcoal, such as iron and lithium, or for large ingestions of sustained-release products.

Why Other Options Were Wrong

• Option A: Syrup of ipecac is an obsolete method for inducing vomiting. It is no longer recommended due to its inconsistent efficacy and high risk of adverse effects, such as prolonged vomiting and aspiration pneumonia.
• Option B: A single dose of activated charcoal is insufficient for a significant ingestion of sustained-release tablets. The charcoal adsorbs the drug currently in the stomach, but it cannot prevent the continued release of the drug from the tablets as they travel through the intestines over many hours.
• Option D: Gastric lavage is an invasive procedure that is rarely indicated. It is generally reserved for potentially lethal ingestions within the first hour. It is often ineffective for removing whole tablets, which can be too large to pass through the orogastric tube, and carries significant risks like aspiration and esophageal injury.

Related Visual

• Visual 1: Flowchart: Decision-making for gastrointestinal decontamination, illustrating the pathway that leads to WBI for sustained-release ingestions versus other methods for different substance types.
• Visual 2: Illustration: A diagram comparing the area of effect of gastric lavage (stomach only), activated charcoal (primarily stomach and upper small intestine), and whole-bowel irrigation (entire GI tract).

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Gastrointestinal decontamination for sustained-release drug poisoning in acute care settings.
• Nurses in the emergency department must be able to quickly differentiate between immediate-release and sustained-release formulations in overdose cases, as this distinction is critical for selecting the correct decontamination strategy.
• Administering WBI is a nursing-intensive procedure that requires close monitoring of the patient's hemodynamic status, fluid balance, electrolyte levels, and for adverse effects like nausea, vomiting, and abdominal cramping.
• What if? If the patient had ingested a rapid-release formulation of the same drug 30 minutes ago, a single dose of activated charcoal would have been the most appropriate intervention, as it would effectively adsorb the drug in the stomach before significant systemic absorption.

How to Approach the Question

• Analyze the patient's status: The patient is conscious, alert, and hemodynamically stable. This suggests that a highly invasive or high-risk procedure is not the first choice unless specifically indicated.
• Identify the most critical information in the stem: The substance ingested is 'sustained-release tablets'. This is the key to answering the question correctly.
• Evaluate each decontamination method based on its mechanism and how it interacts with a sustained-release formulation. Remember that 'sustained-release' means the drug is absorbed slowly over a long period throughout the intestines.
• Eliminate outdated or inappropriate options. Syrup of ipecac is obsolete. Gastric lavage is rarely used, risky, and ineffective for removing whole tablets.
• Compare the two most plausible options: single-dose activated charcoal and whole-bowel irrigation. Recognize that a single dose of charcoal will not be effective long-term as the tablets continue to release the drug. Whole-bowel irrigation is designed to physically flush the entire system.
• Conclude that WBI is the most logical and effective method for mechanically removing undissolved sustained-release tablets from the entire GI tract.

Concept Tested & Keywords

• Concept Tested: Gastrointestinal decontamination for sustained-release drug poisoning
• Stem keywords: conscious, alert, sustained-release tablets, hemodynamically stable, gastrointestinal decontamination
• Lead-in keywords: most likely
• Clinical cues: The term 'sustained-release' is the most critical piece of information, as it points to a specific decontamination strategy.
• Negative lead-in flag: false

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Q7xlbferRvWOpH_PhwnH40

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