A young male is brought to the emergency department with paranoia, tachycardia, mydriasis (dilated pupils), and tactile hallucinations. Examination reveals erythema and perforation of the nasal septum. The patient admits to insufflating (snorting) a white powder. Which substance is the most likely cause of this presentation?

1. A

   Heroin

2. B

   Cocaine

3. C

   Marijuana

4. D

   LSD (Lysergic acid diethylamide)

Appeared in: NORCET 9 Prelims-2025

Explanation

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• The patient's presentation includes a classic sympathomimetic toxidrome: paranoia, tachycardia (fast heart rate), and mydriasis (dilated pupils), which are hallmark effects of a powerful stimulant like cocaine.
• Cocaine use is specifically associated with tactile hallucinations, a phenomenon known as formication or 'cocaine bugs,' where the user feels imaginary insects crawling on their skin.
• The finding of erythema and perforation of the nasal septum is a pathognomonic sign of chronic cocaine insufflation (snorting). Cocaine's potent vasoconstrictive properties cause ischemia and necrosis of the nasal cartilage.
• The patient's admission to snorting a white powder further supports the diagnosis, as cocaine hydrochloride is a white powder commonly administered this way.

Why Other Options Were Wrong

• Option A: Heroin is an opioid and a central nervous system depressant. It would cause opposite symptoms, such as miosis (constricted pupils), bradycardia (slow heart rate), and respiratory depression.
• Option C: While marijuana can cause tachycardia and sometimes paranoia, it does not cause mydriasis, tactile hallucinations, or nasal septum perforation. Its primary signs are conjunctival injection (red eyes) and impaired short-term memory.
• Option D: LSD is a hallucinogen. While it causes mydriasis and can cause tachycardia and paranoia, its hallmark is profound visual hallucinations and perceptual distortions (synesthesia), not tactile hallucinations. It is not associated with nasal septum perforation.

Related Visual

• Visual 1: Image - A clinical photograph showing perforation of the nasal septum. This helps learners visualize the specific physical damage caused by chronic cocaine insufflation.
• Visual 2: Diagram - A comparative chart illustrating pupillary responses to different drugs (miosis for opioids like heroin vs. mydriasis for stimulants like cocaine and hallucinogens like LSD). This reinforces a key physical assessment finding.

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Recognition of clinical signs and symptoms of substance toxicity in acute care settings.
• Nurses in the emergency department must be able to rapidly identify the toxidrome for cocaine to initiate life-saving interventions. This includes cardiac monitoring for arrhythmias and ischemia, blood pressure management, and administration of benzodiazepines for agitation and seizures.
• Patient safety is a primary concern. Individuals with cocaine-induced paranoia can be agitated, unpredictable, and potentially violent. The nurse's role includes ensuring a safe, calm environment for the patient and staff, and using de-escalation techniques.
• What if? - If this patient also had chest pain, the nurse's priority would be to immediately obtain an ECG and cardiac enzyme levels. Cocaine is a major cause of myocardial infarction in young adults due to its vasoconstrictive effects on coronary arteries.

How to Approach the Question

• First, analyze the patient's symptoms and group them. You have sympathomimetic/stimulant signs (paranoia, tachycardia, mydriasis), a unique psychiatric sign (tactile hallucinations), and a specific physical sign (nasal septum perforation).
• Next, consider the toxidromes for each option. Classify each substance: Cocaine (stimulant), Heroin (depressant/opioid), Marijuana (cannabinoid), LSD (hallucinogen).
• Compare the patient's symptom cluster to the known effects of each substance. The stimulant signs rule out heroin immediately.
• Focus on the most specific signs. Tactile hallucinations are strongly linked to cocaine. Nasal septum perforation is a direct result of the vasoconstrictive effect of snorted cocaine.
• Eliminate the other options. LSD causes primarily visual hallucinations, and marijuana does not cause this severe toxidrome or nasal damage. The evidence overwhelmingly points to cocaine.

Concept Tested & Keywords

• Concept Tested: Recognition of clinical signs and symptoms of substance toxicity
• Stem keywords: paranoia, tachycardia, mydriasis, tactile hallucinations, nasal septum perforation, insufflating
• Lead-in keywords: most likely cause
• Clinical cues: The combination of stimulant effects (tachycardia, mydriasis) and local tissue damage (nasal septum perforation) is a key diagnostic clue.

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