Substance Use Disorders Practice Questions

Q: An alcoholic patient presents with psychosis and memory loss. What is the probable diagnosis?

Wernicke-Korsakoff syndrome. **Explanation:** The patient presents with the classic clinical picture of **Wernicke-Korsakoff Syndrome (WKS)**, which is a spectrum of neurological disorders caused by **Thiamine (Vitamin B1) deficiency**, most commonly seen in chronic alcoholics. **1. Why Wernicke-Korsakoff Syndrome is correct:** WKS represents the progression from an acute phase (Wernicke’s Encephalopathy) to a chronic phase (Korsakoff Psychosis). The presence of **memory loss** (specifically anterograde and retrograde amnesia) and **psychosis** (often manifesting as **confabulation**—filling memory gaps with fabricated stories) are the hallmark features of the Korsakoff component. Pathologically, this is associated with lesions in the **mammillary bodies** and the dorsomedial nucleus of the thalamus. **2. Why other options are incorrect:** * **Wernicke's Encephalopathy:** This is the acute, reversible phase characterized by a classic triad: **Ophthalmoplegia** (ataxia), **Global Confusion**, and **Ataxia**. While it is part of the spectrum, it does not typically include the permanent memory deficits or confabulation seen in this patient. * **Acute Psychosis:** While the patient has psychotic symptoms, "Acute Psychosis" is a broad psychiatric descriptor. In the context of alcoholism and memory loss, a nutritional/organic cause (WKS) is the specific medical diagnosis. **Clinical Pearls for NEET-PG:** * **The Triad of Wernicke:** Confusion, Ataxia, Ophthalmoplegia (nystagmus). * **The Pentad of WKS:** The triad + Amnesia and Confabulation. * **Treatment Rule:** Always administer **Thiamine before Glucose** in an alcoholic patient. Giving glucose first can precipitate Wernicke’s by consuming the remaining B1 stores during glycolysis. * **MRI Finding:** High signal intensity in the mammillary bodies.

Q: Methadone is used to treat withdrawal symptoms of which substance?

Heroin. **Explanation:** **Correct Answer: B. Heroin** Methadone is a **synthetic, long-acting mu-opioid receptor full agonist**. In the management of Opioid Use Disorder (Heroin), it works through "cross-tolerance." Because it has a much longer half-life (24–36 hours) than heroin, it prevents withdrawal symptoms and reduces "drug hunger" (craving) without producing the significant euphoria or "rush" associated with illicit opioids. It is used both for acute detoxification and long-term maintenance therapy. **Why other options are incorrect:** * **A & C (Cocaine & Amphetamines):** These are CNS stimulants. There is no specific FDA-approved pharmacological replacement therapy for stimulant withdrawal. Management is primarily supportive, focusing on psychological interventions and treating symptoms like depression or agitation. * **D (Barbiturates):** These are sedative-hypnotics. Withdrawal is life-threatening (similar to alcohol) and is managed by a slow taper of the drug itself or by substituting with a long-acting benzodiazepine (like Diazepam) or Phenobarbital. **High-Yield Clinical Pearls for NEET-PG:** * **Buprenorphine:** A partial mu-opioid agonist and kappa antagonist; it has a "ceiling effect" on respiratory depression, making it safer than methadone. * **Naltrexone:** An opioid antagonist used for relapse prevention *after* detoxification is complete (patient must be opioid-free for 7–10 days). * **Clonidine:** An alpha-2 agonist used to treat the autonomic symptoms of opioid withdrawal (tachycardia, hypertension, sweating) but does not reduce cravings. * **Lofexidine:** The first non-opioid drug specifically approved for managing opioid withdrawal symptoms.

Q: Jet black pigmentation of the tongue with tactile hallucinations is a feature of which substance use?

Cocaine. **Explanation:** The correct answer is **Cocaine**. This question tests the recognition of specific physical and psychological markers associated with stimulant abuse. **1. Why Cocaine is Correct:** * **Jet Black Tongue (Melanoglossia):** Chronic smoking of "crack" cocaine can lead to a characteristic black discoloration of the dorsal surface of the tongue. This is attributed to the deposition of carbonaceous combustion products or thermal injury to the filiform papillae. * **Tactile Hallucinations:** Cocaine intoxication frequently causes **Formication** (also known as "Cocaine bugs" or Magnan’s symptom). Patients experience a distressing sensation of insects crawling under or on their skin, often leading to skin picking and excoriations. **2. Analysis of Incorrect Options:** * **Heroin (Opioid):** Typically presents with miosis (pinpoint pupils), respiratory depression, and track marks. It does not cause tongue pigmentation or tactile hallucinations. * **Cannabis:** Characterized by conjunctival injection (red eyes), increased appetite (munchies), and dry mouth. While it can cause paranoia, it is not associated with black tongue. * **LSD (Hallucinogen):** Primarily causes **visual** hallucinations, synesthesia (seeing sounds/hearing colors), and mydriasis. It does not typically produce the specific tactile hallucinations or oral findings seen with cocaine. **3. Clinical Pearls for NEET-PG:** * **Magnan’s Symptom:** A specific term for tactile hallucinations in cocaine users. * **Cocaine & Pupils:** Causes **Mydriasis** (dilated pupils), unlike Heroin (Miosis). * **Cocaine & CVS:** It is a potent vasoconstrictor; look for history of MI or perforated nasal septum in clinical stems. * **Withdrawal:** Cocaine withdrawal is characterized by "crashing" (dysphoria, hypersomnia, and intense craving) but is not life-threatening.

Q: Dissociative Fugue is characterised by

Wandering away from home. **Explanation:** **Dissociative Fugue** (now classified under Dissociative Amnesia in DSM-5) is a dissociative disorder characterized by a sudden, unexpected travel away from one’s home or place of daily activities, accompanied by an inability to recall some or all of one's past. 1. **Why Option A is correct:** The hallmark of a fugue state is **purposeful wandering**. Patients often adopt a new identity and are unable to remember their previous life during the episode. The "wandering" is not aimless (like in delirium) but appears organized to an outside observer. 2. **Why Options B, C, and D are incorrect:** * **B & C:** Recovery from dissociative fugue is typically **sudden and rapid**, not gradual. Furthermore, the amnesia is **reversible**; once the fugue state ends, the individual usually recovers their original identity and memories of their past life (though they may then have amnesia for the events that occurred *during* the fugue). * **D:** **Normal recall** is absent during the episode. The patient suffers from selective or generalized amnesia regarding their identity and history. **High-Yield Clinical Pearls for NEET-PG:** * **Trigger:** Usually precipitated by severe psychosocial stressors (e.g., marital discord, financial ruin, or wartime trauma). * **Identity:** A patient in a fugue state may assume a completely new name, occupation, and personality. * **Differential Diagnosis:** Must be distinguished from **Complex Partial Seizures** (where wandering is semi-purposeful and brief) and **Transient Global Amnesia** (which lacks identity loss). * **Management:** The primary goal is to establish safety. Psychotherapy and "abreaction" (using hypnosis or barbiturates to recover memories) are traditional treatment modalities.

Q: Alcohol dependence is associated with all of the following except?

Alcohol amotivational syndrome. **Explanation:** The correct answer is **D. Alcohol amotivational syndrome**. **Amotivational syndrome** is a clinical condition characterized by detachment, lack of drive, apathy, and a diminished ability to focus on long-term goals. This syndrome is classically associated with **chronic Cannabis use**, not alcohol. While chronic alcohol use can lead to depression and cognitive decline, it does not typically present as the specific "amotivational" cluster seen with cannabinoids. **Analysis of Incorrect Options:** * **Anxiety Disorder:** Alcohol has a high rate of comorbidity with anxiety. While alcohol is often used for "self-medication" (the tension-reduction hypothesis), chronic use and withdrawal states significantly exacerbate anxiety symptoms. * **Dementia:** Chronic alcohol dependence is a known cause of cognitive impairment. This can occur directly (Alcoholic Dementia) or indirectly via thiamine deficiency leading to **Wernicke-Korsakoff Syndrome**, which involves significant memory deficits and confabulation. * **Sexual Dysfunction:** Alcohol is a central nervous system depressant. Chronic use leads to erectile dysfunction, decreased libido, and delayed ejaculation. In men, it can also cause testicular atrophy and gynecomastia due to altered estrogen/testosterone metabolism. **High-Yield Clinical Pearls for NEET-PG:** * **Cannabis:** Associated with Amotivational Syndrome and increased risk of Schizophrenia in predisposed individuals. * **Cocaine:** Associated with "Formication" (Cocaine bugs/Magnan’s symptom). * **Alcohol Withdrawal:** The first symptom is usually tremors (6–12 hours); the most severe manifestation is **Delirium Tremens** (48–72 hours). * **Wernicke’s Encephalopathy Triad:** Confusion, Ataxia, and Ophthalmoplegia (due to Thiamine/B1 deficiency).

Question 1

An alcoholic patient presents with psychosis and memory loss. What is the probable diagnosis?

Accepted Answer

Wernicke-Korsakoff syndrome

Answer

Wernicke's encephalopathy

Answer

Acute psychosis

Answer

None of the above

Question 2

Methadone is used to treat withdrawal symptoms of which substance?

Accepted Answer

Heroin

Answer

Cocaine

Answer

Amphetamine

Answer

Barbiturate

Question 3

Jet black pigmentation of the tongue with tactile hallucinations is a feature of which substance use?

Accepted Answer

Cocaine

Answer

Heroin

Answer

Cannabis

Answer

LSD

Question 4

Dissociative Fugue is characterised by

Accepted Answer

Wandering away from home

Answer

Irreversible amnesia

Answer

Gradual recovery

Answer

Normal recall

Question 5

Alcohol dependence is associated with all of the following except?

Accepted Answer

Alcohol amotivational syndrome

Answer

Anxiety disorder

Answer

Dementia

Answer

Sexual dysfunction

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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