Substance Use Disorders Practice Questions

Q: Korsakoff's psychosis is seen in which condition?

Chronic alcoholism. **Explanation:** **Korsakoff’s Psychosis** is a late-stage manifestation of **Wernicke-Korsakoff Syndrome (WKS)**, primarily caused by a severe deficiency of **Thiamine (Vitamin B1)**. In the context of **Chronic Alcoholism (Option C)**, thiamine deficiency occurs due to poor dietary intake, impaired gastrointestinal absorption, and reduced hepatic storage of the vitamin. While Wernicke’s Encephalopathy is the acute, reversible phase, Korsakoff’s Psychosis is the chronic, often irreversible stage characterized by selective anterograde and retrograde amnesia and **confabulation** (filling memory gaps with fabricated stories). **Analysis of Incorrect Options:** * **Option A (Acute Alcoholism):** Acute intoxication presents with cerebellar ataxia and slurred speech but does not cause the structural brain damage (atrophy of mammillary bodies) required for Korsakoff’s. * **Option B (Carbon Monoxide Poisoning):** While CO poisoning causes hypoxia and can lead to delayed neuropsychiatric sequelae (like Parkinsonism or globus pallidus lesions), it is not the classic cause of Korsakoff’s. * **Option D (Multiple Sclerosis):** This is a demyelinating disease of the CNS presenting with optic neuritis or sensory-motor deficits, not a thiamine-related amnestic syndrome. **High-Yield Clinical Pearls for NEET-PG:** 1. **The Triad of Wernicke’s:** Confusion, Ataxia, and Ophthalmoplegia (6th nerve palsy). 2. **Pathology:** Characterized by hemorrhage and atrophy of the **Mammillary bodies** and dorsomedial nucleus of the thalamus. 3. **The "Glucose Rule":** Always administer Thiamine *before* Glucose in a chronic alcoholic to prevent precipitating Wernicke’s Encephalopathy. 4. **Confabulation:** This is the hallmark psychiatric feature of Korsakoff’s, used by the patient to maintain self-esteem despite memory loss.

Q: Which drug is used in the treatment of smoking and tobacco addiction cessation?

Varenicline. **Explanation:** **Varenicline** is the correct answer as it is a first-line pharmacological agent specifically approved for smoking cessation. Its mechanism of action involves being a **selective partial agonist at the α4β2 nicotinic acetylcholine receptors**. By partially stimulating these receptors, it reduces withdrawal symptoms (agonist effect) while simultaneously blocking the binding of nicotine from cigarettes, thereby reducing the "reward" or reinforcement associated with smoking (antagonist effect). **Analysis of Incorrect Options:** * **Acamprosate:** Used for the maintenance of abstinence in **Alcohol Use Disorder**. It acts as a glutamate modulator (NMDA receptor antagonist) to restore the GABA/glutamate balance disrupted by chronic alcohol use. * **Baclofen:** A GABA-B receptor agonist primarily used as a muscle relaxant. While it is sometimes used off-label to reduce cravings in alcohol or opioid dependence, it is not a standard treatment for tobacco cessation. * **Naltrexone:** An opioid receptor antagonist used in the treatment of **Alcohol Dependence** (to reduce craving/heavy drinking) and **Opioid Dependence** (to prevent relapse). **High-Yield Clinical Pearls for NEET-PG:** * **First-line agents for Smoking Cessation:** Nicotine Replacement Therapy (NRT), Varenicline, and Bupropion (an atypical antidepressant). * **Varenicline Side Effects:** Most common is nausea; it was previously associated with neuropsychiatric symptoms (suicidal ideation), though recent data suggests these risks are lower than initially feared. * **Bupropion Contraindication:** Avoid in patients with a history of seizures or eating disorders (bulimia/anorexia), as it lowers the seizure threshold. * **Cytisine:** Another partial nicotinic agonist (similar to Varenicline) gaining importance in recent literature.

Q: Which of the following conditions is most commonly associated with visual hallucinations?

Delirium tremens. ### Explanation **Correct Option: A. Delirium tremens** Delirium tremens (DT) is the most severe form of alcohol withdrawal, typically occurring 48–96 hours after the last drink. It is characterized by altered sensorium, autonomic hyperactivity, and **vivid visual hallucinations** (often involving small animals or insects, known as microzoopsia). In clinical medicine, visual hallucinations are a hallmark of **organic brain syndromes** (toxic, metabolic, or withdrawal states), whereas auditory hallucinations are more characteristic of primary psychiatric disorders. **Analysis of Incorrect Options:** * **B. Schizophrenia:** While visual hallucinations can occur, the pathognomonic feature of schizophrenia is **auditory hallucinations** (e.g., third-person voices commenting on the patient's actions). * **C. Cocaine intoxication:** This is classically associated with **tactile hallucinations**, specifically "formication" (the sensation of insects crawling under the skin, also known as 'cocaine bugs' or Magnan’s sign). * **D. Temporal lobe epilepsy:** This condition is more frequently associated with **olfactory hallucinations** (uncinate fits) or complex phenomena like *déjà vu* and *jamais vu*. **NEET-PG High-Yield Pearls:** * **Alcohol Withdrawal Timeline:** 6–12 hrs (Tremors) → 12–24 hrs (Hallucinosis) → 24–48 hrs (Seizures/Rum fits) → 48–96 hrs (Delirium Tremens). * **Visual Hallucinations = Organic cause** until proven otherwise (e.g., DTs, Uremia, Hepatic Encephalopathy). * **Charles Bonnet Syndrome:** Complex visual hallucinations in patients with significant visual impairment (intact cognition). * **Lilliputian Hallucinations:** Seeing people or objects as smaller than they are; common in organic states.

Q: Which drug's long-term use effects can closely mimic schizophrenia?

Amphetamines. **Explanation:** The correct answer is **Amphetamines**. **Why Amphetamines?** Chronic use of amphetamines leads to a condition known as **Amphetamine-Induced Psychosis**, which is clinically indistinguishable from the positive symptoms of schizophrenia. The underlying mechanism is the **Dopamine Hypothesis**: amphetamines trigger a massive release of dopamine and block its reuptake in the mesolimbic pathway. This results in symptoms such as paranoid delusions, auditory and visual hallucinations, and disorganized behavior. Unlike other drug-induced states, amphetamine psychosis can persist for weeks even after cessation of the drug. **Analysis of Incorrect Options:** * **Alcohol:** Long-term use is associated with Wernicke-Korsakoff syndrome (memory deficits) or Alcohol Hallucinosis. While hallucinosis involves auditory hallucinations, it occurs in a clear sensorium and lacks the complex delusional system seen in schizophrenia. * **Opioids:** Chronic use typically leads to sedation, miosis, and physical dependence. Withdrawal causes autonomic hyperactivity, but it does not mimic the chronic psychotic features of schizophrenia. * **MDMA (Ecstasy):** While it has hallucinogenic properties due to serotonin release, its long-term effects are primarily related to mood disturbances (depression), cognitive impairment, and neurotoxicity rather than a chronic schizophreniform presentation. **Clinical Pearls for NEET-PG:** * **Formication (Magnan’s Sign):** A classic symptom of stimulant (cocaine/amphetamine) use where the patient feels "bugs crawling under the skin." * **Differential:** To distinguish from schizophrenia, look for **sympathomimetic signs** (tachycardia, mydriasis, hypertension) which are present in amphetamine use but absent in schizophrenia. * **Treatment:** Antipsychotics (D2 blockers) are the treatment of choice for the acute psychotic episode.

Q: The CAGE questionnaire is used to screen for:

Alcohol abuse. **Explanation:** The **CAGE questionnaire** is a globally recognized, four-item clinical screening tool used to identify potential **alcohol use disorder (alcohol abuse or dependence)**. It is highly favored in busy clinical settings due to its brevity and high sensitivity. The acronym **CAGE** stands for: * **C: Cut down** – Have you ever felt you should cut down on your drinking? * **A: Annoyed** – Have people annoyed you by criticizing your drinking? * **G: Guilty** – Have you ever felt bad or guilty about your drinking? * **E: Eye-opener** – Have you ever had a drink first thing in the morning to steady your nerves or get rid of a hangover? A score of **2 or more** is considered clinically significant, indicating a high probability of alcohol abuse. **Analysis of Incorrect Options:** * **B. Depression:** Screened using tools like the **PHQ-9** (Patient Health Questionnaire) or the **Beck Depression Inventory (BDI)**. * **C. Suicidal Intention:** Assessed using scales like the **SAD PERSONS scale** or the Columbia-Suicide Severity Rating Scale (C-SSRS). * **D. Coma:** Evaluated using the **Glasgow Coma Scale (GCS)** to determine the level of consciousness. **High-Yield Clinical Pearls for NEET-PG:** * **Sensitivity:** The CAGE questionnaire is more sensitive for detecting dependence than heavy drinking. * **T-ACE & AUDIT:** Other important screening tools for alcohol include the **AUDIT** (Alcohol Use Disorders Identification Test), which is the gold standard for detecting early hazardous drinking, and **T-ACE**, specifically designed for pregnant women. * **Most sensitive question:** The "Eye-opener" question is often considered the most specific indicator of physical dependence.

Q: Paranoid delusions are associated with the use of which substance?

Cocaine. **Explanation:** **Cocaine (Option A)** is a potent central nervous system stimulant that acts by inhibiting the reuptake of dopamine, norepinephrine, and serotonin. The resulting surge in synaptic dopamine, particularly in the mesolimbic pathway, is strongly associated with the development of **Cocaine-Induced Psychosis**. This condition is classically characterized by **paranoid delusions** (e.g., being followed by police) and tactile hallucinations, such as **formication** (the sensation of insects crawling under the skin, also known as "Cocaine bugs"). **Why other options are incorrect:** * **Heroin (Option B):** As an opioid, it primarily causes CNS depression, euphoria, and miosis. While withdrawal can cause agitation, it does not typically present with paranoid delusions. * **Cannabis (Option C):** While cannabis can cause acute anxiety or "cannabis-induced psychosis," it is more frequently associated with amotivational syndrome and perceptual distortions. In the context of standard NEET-PG questions, cocaine is the classic association for acute paranoid states. * **GHB (Option D):** Gamma-Hydroxybutyrate is a CNS depressant often used as a "date rape drug." It typically causes sedation, bradycardia, and respiratory depression rather than psychosis. **High-Yield Clinical Pearls for NEET-PG:** * **Magnan’s Symptom:** Another name for formication (tactile hallucinations) specifically seen in cocaine use. * **Physical Signs:** Look for sympathetic overactivity—mydriasis (dilated pupils), tachycardia, hypertension, and tremors. * **Chronic Use:** May lead to perforation of the nasal septum due to vasoconstriction. * **Treatment:** Acute cocaine-induced paranoia is generally managed with benzodiazepines and, if severe, antipsychotics.

Q: A person with a 20-year history of daily alcohol consumption and physical dependence is to be treated. Which drug should NOT be administered to this individual?

Disulfiram. ### Explanation The correct answer is **Disulfiram**. **Why Disulfiram is contraindicated in this scenario:** The patient has a 20-year history of daily alcohol consumption and **physical dependence**. In such cases, the immediate clinical priority is the management of **Alcohol Withdrawal Syndrome (AWS)**. Disulfiram is an alcohol-sensitizing agent that inhibits the enzyme *aldehyde dehydrogenase*, leading to the accumulation of acetaldehyde if alcohol is consumed. Administering Disulfiram to a person currently dependent or likely to have alcohol still in their system can trigger a severe, potentially fatal **Disulfiram-Ethanol Reaction (DER)**. Furthermore, Disulfiram is used for **maintenance of abstinence** (relapse prevention) and has no role in the acute detoxification phase. It should only be started after the patient has been abstinent for at least 12–24 hours and has cleared the withdrawal phase. **Analysis of Incorrect Options:** * **Chlordiazepoxide:** This is a long-acting benzodiazepine and the **drug of choice** for managing acute alcohol withdrawal symptoms and preventing seizures/delirium tremens. * **Acamprosate:** An NMDA receptor antagonist used for maintaining abstinence. It is safe to start even if the patient is not yet fully abstinent and is preferred in patients with liver disease. * **Naltrexone:** An opioid antagonist that reduces alcohol cravings and the "reward" of drinking. It can be initiated while the patient is still drinking. **NEET-PG High-Yield Pearls:** * **Gold Standard for Withdrawal:** Benzodiazepines (Chlordiazepoxide or Diazepam). If liver failure is present, use **LOT** (Lorazepam, Oxazepam, Temazepam). * **Disulfiram Mechanism:** Irreversible inhibition of Aldehyde Dehydrogenase. * **Wernicke’s Encephalopathy:** Always administer **Thiamine before Glucose** in chronic alcoholics to prevent precipitating Wernicke’s. * **First-line for Cravings:** Naltrexone or Acamprosate.

Q: Which of the following medications is used to maintain abstinence in alcohol dependence?

Naltrexone. **Explanation:** The management of alcohol dependence is divided into two phases: treatment of acute withdrawal and **maintenance of abstinence** (prevention of relapse). **Correct Option: A. Naltrexone** Naltrexone is an **opioid receptor antagonist** that is considered a first-line drug for maintaining abstinence. It works by blocking the $\mu$-opioid receptors, thereby reducing the "reward" or euphoria associated with alcohol consumption and significantly decreasing **craving**. Unlike disulfiram, it can be started while the patient is still drinking. **Incorrect Options:** * **B. Clonidine:** This is an $\alpha_2$-agonist used to manage the **autonomic hyperactivity** (tachycardia, hypertension) seen during *acute alcohol withdrawal*. It does not prevent relapse or maintain long-term abstinence. * **C. Disulfiram:** While used in alcohol dependence, it is an **aversion therapy** agent. It inhibits *aldehyde dehydrogenase*, causing a buildup of acetaldehyde if alcohol is consumed. However, recent clinical guidelines (and frequently NEET-PG patterns) prioritize Naltrexone and Acamprosate as superior for "maintaining abstinence" due to better compliance and reduced craving. * **D. Naloxone:** This is a short-acting opioid antagonist used intravenously for the emergency reversal of **acute opioid overdose**. It has no role in the long-term management of alcohol dependence due to its poor oral bioavailability and short half-life. **High-Yield Clinical Pearls for NEET-PG:** * **Acamprosate** (NMDA antagonist) is the other first-line drug for abstinence, especially useful in patients with liver disease (as Naltrexone is hepatotoxic). * **Disulfiram** does NOT reduce craving; it only acts as a psychological deterrent. * **Benzodiazepines** (e.g., Chlordiazepoxide) remain the "Gold Standard" for managing **acute withdrawal symptoms** and preventing seizures/delirium tremens.

Question 1

Korsakoff's psychosis is seen in which condition?

Accepted Answer

Chronic alcoholism

Answer

Acute alcoholism

Answer

Carbon monoxide poisoning

Answer

Multiple sclerosis

Question 2

Which drug is used in the treatment of smoking and tobacco addiction cessation?

Accepted Answer

Varenicline

Answer

Acamprosate

Answer

Baclofen

Answer

Naltrexone

Question 3

What is the first-line treatment for smoking cessation?

Accepted Answer

Varenicline

Answer

Nortriptyline

Answer

Clonidine

Answer

Buspirone

Question 4

Which of the following conditions is most commonly associated with visual hallucinations?

Accepted Answer

Delirium tremens

Answer

Schizophrenia

Answer

Cocaine intoxication (leading to tactile hallucinations like 'cocaine bugs')

Answer

Temporal lobe epilepsy

Question 5

Which drugs are used in the maintenance treatment of substance dependence?

Accepted Answer

Disulfiram

Answer

Naloxone

Answer

Acamprosate

Answer

Clonidine

Question 6

Which drug's long-term use effects can closely mimic schizophrenia?

Accepted Answer

Amphetamines

Answer

Alcohol

Answer

Opioids

Answer

MDMA

Question 7

The CAGE questionnaire is used to screen for:

Accepted Answer

Alcohol abuse

Answer

Depression

Answer

Suicidal intention

Answer

Coma

Question 8

Paranoid delusions are associated with the use of which substance?

Accepted Answer

Cocaine

Answer

Heroin

Answer

Cannabis

Answer

GHB

Question 9

A person with a 20-year history of daily alcohol consumption and physical dependence is to be treated. Which drug should NOT be administered to this individual?

Accepted Answer

Disulfiram

Answer

Acamprosate

Answer

Naltrexone

Answer

Chlordiazepoxide

Question 10

Which of the following medications is used to maintain abstinence in alcohol dependence?

Accepted Answer

Naltrexone

Answer

Clonidine

Answer

Disulfiram

Answer

Naloxone

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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