Substance Use Disorders — MCQs
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A person with a 10-year history of alcohol consumption is brought to the emergency department with complaints of fearfulness, misrecognition, talking to themselves, and visual hallucinations of snakes and reptiles. Physical dependence has been present for 2 years, with intense craving for alcohol. For the past year, they have experienced behavioral changes and interpersonal difficulties. They sometimes exhibit nocturnal tremors. What condition is this person suffering from?
Delirium tremens is characteristically seen in which of the following conditions?
A person who is a drug addict starts hearing lights and seeing voices. The substance is:
Korsakoff's psychosis is associated with all of the following except:
Alcohol dependence is defined as?
A 17-year-old boy presents with sweating, yawning, lacrimation, and tachycardia. His friends report that he has not been attending college lately. What is the likely diagnosis?
Which of the following hallucinogens is known as "angel dust"?
Confabulation is typically seen in which of the following conditions?
Which of the following drugs is best avoided in a chronic alcoholic patient?
All of the following are true about cocaine addiction except?
Substance Use Disorders Indian Medical PG Practice Questions and MCQs
Question 141: A person with a 10-year history of alcohol consumption is brought to the emergency department with complaints of fearfulness, misrecognition, talking to themselves, and visual hallucinations of snakes and reptiles. Physical dependence has been present for 2 years, with intense craving for alcohol. For the past year, they have experienced behavioral changes and interpersonal difficulties. They sometimes exhibit nocturnal tremors. What condition is this person suffering from?
- A. Alcoholic psychosis
- B. Delirium tremens (Correct Answer)
- C. Wernicke's Korsakoff syndrome
- D. Schizophrenia
Explanation: ### Explanation **Correct Option: B. Delirium tremens (DT)** Delirium tremens is the most severe form of alcohol withdrawal, typically occurring 48–96 hours after the last drink. The clinical presentation in this case is classic: * **Clouding of consciousness:** Indicated by "misrecognition" (disorientation). * **Visual Hallucinations:** Specifically **Lilliputian hallucinations** (small animals/reptiles like snakes), which are characteristic of DT. * **Autonomic Hyperactivity:** Manifesting as tremors (worse at night) and fearfulness (agitation). * **Chronic History:** The 10-year history and physical dependence provide the necessary substrate for severe withdrawal. **Why other options are incorrect:** * **A. Alcoholic Psychosis:** While it involves hallucinations, it occurs in a **clear sensorium** (the patient is oriented and not confused). The "misrecognition" in this case points toward delirium rather than pure psychosis. * **C. Wernicke-Korsakoff Syndrome:** This is characterized by the triad of ataxia, ophthalmoplegia, and confusion (Wernicke’s) or profound anterograde amnesia and confabulation (Korsakoff’s). It does not typically present with acute visual hallucinations of snakes. * **D. Schizophrenia:** This is a functional psychotic disorder. Hallucinations are primarily **auditory**, and it lacks the acute autonomic instability and history of alcohol withdrawal seen here. **High-Yield NEET-PG Pearls:** * **Timeframe:** DT usually peaks at **72 hours** post-cessation. * **Drug of Choice:** **Benzodiazepines** (Chlordiazepoxide or Diazepam). If liver failure is present, use **LOT** (Lorazepam, Oxazepam, Temazepam). * **Mortality:** DT is a medical emergency with a mortality rate of up to 5% (usually due to cardiovascular collapse or hyperthermia). * **Formication:** The sensation of insects crawling on the skin (Cocaine bugs) can also occur in alcohol withdrawal.
Question 142: Delirium tremens is characteristically seen in which of the following conditions?
- A. Chronic alcoholism (Correct Answer)
- B. Vitamin B2 deficiency
- C. Vitamin B12 deficiency
- D. Niacin deficiency
Explanation: **Explanation:** **Delirium Tremens (DTs)** is the most severe form of alcohol withdrawal, occurring in patients with **chronic alcoholism**. It typically manifests 48 to 96 hours after the last drink. The underlying pathophysiology involves the sudden cessation of alcohol, which leads to a state of **NMDA receptor upregulation** and **GABA receptor downregulation**. This results in profound autonomic hyperactivity and neurotoxicity. Clinical features include clouding of consciousness (delirium), vivid visual hallucinations (e.g., microzoopsia), tremors, tachycardia, hypertension, and hyperthermia. **Why other options are incorrect:** * **Vitamin B2 (Riboflavin) deficiency:** Characterized by cheilosis, glossitis, and corneal vascularization, but does not cause delirium. * **Vitamin B12 (Cobalamin) deficiency:** Leads to Subacute Combined Degeneration (SCD) of the spinal cord and megaloblastic anemia. While it can cause "megaloblastic madness" (psychosis/dementia), it does not cause the acute autonomic storm seen in DTs. * **Niacin (Vitamin B3) deficiency:** Causes **Pellagra**, characterized by the 4 Ds: Dermatitis, Diarrhea, Dementia, and Death. While dementia involves cognitive decline, it is distinct from the acute withdrawal state of delirium tremens. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Benzodiazepines (e.g., Diazepam, Lorazepam) are the mainstay of treatment to prevent seizures and manage agitation. * **Mortality:** If untreated, DTs has a mortality rate of up to 20%, usually due to arrhythmias or respiratory failure. * **Wernicke’s Encephalopathy:** Often co-occurs in chronic alcoholics due to **Thiamine (B1)** deficiency, not B2, B12, or Niacin. Always give Thiamine before Glucose in these patients.
Question 143: A person who is a drug addict starts hearing lights and seeing voices. The substance is:
- A. LSD (Correct Answer)
- B. Marijuana
- C. Cocaine
- D. Alcohol
Explanation: ### Explanation The phenomenon described in the question—"hearing lights and seeing voices"—is known as **Synesthesia**. This is a perceptual distortion where the stimulation of one sensory pathway leads to automatic, involuntary experiences in a second sensory pathway (sensory blending). **1. Why LSD is the Correct Answer:** LSD (Lysergic Acid Diethylamide) is a potent hallucinogen that acts primarily as a partial agonist at **5-HT2A receptors**. It causes profound alterations in perception, mood, and thought. Synesthesia is a classic, high-yield clinical feature of LSD intoxication, often accompanied by "trip" experiences, intensified colors, and distorted shapes (macropsia/micropsia). **2. Analysis of Incorrect Options:** * **Marijuana:** While it can cause distorted sensory perception and paranoia at high doses, it typically presents with conjunctival injection, increased appetite (munchies), and tachycardia. Synesthesia is not a hallmark feature. * **Cocaine:** A stimulant that primarily causes euphoria, pupillary dilation, and sympathetic overactivity. Chronic use is associated with **Formication** (Cocaine bugs)—the tactile hallucination that insects are crawling under the skin. * **Alcohol:** Acute intoxication leads to CNS depression. Withdrawal is associated with tremors, seizures, and **Delirium Tremens**, characterized by visual hallucinations (often small animals/zoopsia), but not synesthesia. **3. NEET-PG High-Yield Pearls:** * **Flashbacks (Hallucinogen Persisting Perception Disorder):** Recurrence of the "trip" weeks or months after LSD use. * **Bad Trip Management:** Use "talking down" techniques or benzodiazepines. * **PCP (Phencyclidine):** Often confused with LSD in exams; look for **vertical/rotary nystagmus** and extreme aggression. * **Mescaline/Psilocybin:** Other hallucinogens that can cause similar effects but are less commonly tested than LSD.
Question 144: Korsakoff's psychosis is associated with all of the following except:
- A. Confabulation
- B. Short term memory loss
- C. Long term memory loss (Correct Answer)
- D. Mammillary bodies involved
Explanation: **Explanation:** Korsakoff’s Psychosis (or Korsakoff’s Syndrome) is a chronic neurological condition resulting from a severe deficiency of **Thiamine (Vitamin B1)**, most commonly seen in chronic alcoholics following an episode of Wernicke’s Encephalopathy. **Why "Long-term memory loss" is the correct answer:** In Korsakoff’s syndrome, **long-term (remote) memory is typically preserved**. The hallmark of the condition is **Anterograde amnesia** (inability to form new memories/short-term memory loss) and, to a lesser extent, retrograde amnesia for recent events. Because the patient cannot bridge the gaps in their recent memory, they remain oriented to their distant past while struggling with the present. **Analysis of incorrect options:** * **Confabulation (Option A):** This is a classic feature where patients unconsciously fill in memory gaps with fabricated or distorted stories. They are not intentionally lying but truly believe the false memories. * **Short-term memory loss (Option B):** This is the core deficit. Patients have a profound inability to learn new information or recall events that occurred just minutes prior. * **Mammillary bodies involved (Option D):** Pathologically, Korsakoff’s is characterized by bilateral lesions in the **mammillary bodies** and the **dorsomedial nucleus of the thalamus**. Atrophy of these structures is a high-yield neuroimaging finding. **High-Yield Clinical Pearls for NEET-PG:** * **Wernicke’s Encephalopathy Triad:** Confusion, Ataxia, and Ophthalmoplegia (Reversible). * **Korsakoff’s Psychosis:** Characterized by Amnesia and Confabulation (Often irreversible). * **Treatment:** Always administer Thiamine **before** Glucose to prevent precipitating or worsening Wernicke’s Encephalopathy. * **Neuroanatomy:** The Papez circuit is disrupted, specifically involving the mammillary bodies.
Question 145: Alcohol dependence is defined as?
- A. Drinking even while knowing it causes bodily harm
- B. Experiencing a withdrawal state when alcohol use has ceased
- C. Evidence of tolerance to alcohol
- D. All of the above (Correct Answer)
Explanation: **Explanation:** Alcohol Dependence is a clinical syndrome characterized by a cluster of behavioral, cognitive, and physiological phenomena that develop after repeated alcohol use. According to the **ICD-10 criteria** (which is frequently tested in NEET-PG), a diagnosis of dependence is made if **three or more** of the following have been present at some time during the previous year: 1. **Tolerance (Option C):** A need for significantly increased amounts of alcohol to achieve intoxication or the desired effect. 2. **Withdrawal (Option B):** Physiological withdrawal state when alcohol use is ceased or reduced, or using alcohol to relieve/avoid withdrawal symptoms. 3. **Persistence despite harm (Option A):** Continued use despite clear evidence of overtly harmful consequences (physical, psychological, or social). 4. **Compulsion:** A strong desire or sense of compulsion to take the substance. 5. **Impaired Control:** Difficulty in controlling onset, termination, or levels of use. 6. **Salience:** Progressive neglect of alternative pleasures or interests in favor of drinking. **Why "All of the Above" is correct:** Options A, B, and C represent the core physiological and behavioral pillars of the ICD-10 and DSM-IV criteria for dependence. Since all three are recognized diagnostic features, "All of the above" is the most accurate choice. **High-Yield Clinical Pearls for NEET-PG:** * **CAGE Questionnaire:** The most popular screening tool for alcohol dependence (Cut down, Annoyed, Guilty, Eye-opener). * **Wernicke’s Encephalopathy:** Triad of Ataxia, Ophthalmoplegia, and Confusion (due to Thiamine/B1 deficiency). * **Disulfiram:** An aversive agent that inhibits aldehyde dehydrogenase, causing accumulation of acetaldehyde. * **Acamprosate:** Used to maintain abstinence by reducing cravings (NMDA antagonist).
Question 146: A 17-year-old boy presents with sweating, yawning, lacrimation, and tachycardia. His friends report that he has not been attending college lately. What is the likely diagnosis?
- A. Heroin withdrawal (Correct Answer)
- B. Cocaine withdrawal
- C. LSD withdrawal
- D. Marijuana withdrawal
Explanation: **Explanation:** The clinical presentation of **sweating, yawning, lacrimation, and tachycardia** in a young patient is a classic constellation of symptoms for **Opioid (Heroin) withdrawal**. **1. Why Heroin Withdrawal is Correct:** Opioids are CNS depressants. When an habituated user stops intake, the body experiences a "rebound" hyperactivity of the autonomic nervous system. * **Key Signs:** Lacrimation (tearing), rhinorrhea (runny nose), yawning, and sweating are early pathognomonic signs. * **Other Features:** Mydriasis (dilated pupils), piloerection (goosebumps—hence the term "cold turkey"), tachycardia, tremors, and intense muscle/abdominal cramps. **2. Why Other Options are Incorrect:** * **Cocaine Withdrawal:** Characterized by "the crash"—dysphoria, fatigue, vivid unpleasant dreams, increased appetite, and psychomotor retardation. It does not typically feature lacrimation or yawning. * **LSD Withdrawal:** LSD does not produce a significant physical withdrawal syndrome; it primarily causes psychological dependence and "flashbacks" (Hallucinogen Persisting Perception Disorder). * **Marijuana Withdrawal:** Usually mild, involving irritability, insomnia, and decreased appetite, but lacks the dramatic autonomic signs like lacrimation and tachycardia seen here. **High-Yield Clinical Pearls for NEET-PG:** * **Piloerection** is the most specific physical sign of opioid withdrawal. * **Pupillary changes:** Opioid *Intoxication* causes Pin-point pupils (Miosis); Opioid *Withdrawal* causes Mydriasis. * **Management:** Clonidine (alpha-2 agonist) helps with autonomic symptoms; Methadone or Buprenorphine are used for long-term detoxification. * **Note:** Opioid withdrawal is extremely uncomfortable but, unlike Alcohol or Benzodiazepine withdrawal, it is **not** typically life-threatening.
Question 147: Which of the following hallucinogens is known as "angel dust"?
- A. LSD
- B. Phencyclidine (Correct Answer)
- C. Heroin
- D. Mescaline
Explanation: **Explanation:** **Phencyclidine (PCP)**, the correct answer, is a dissociative anesthetic originally developed in the 1950s. It is colloquially known as **"Angel Dust."** Pharmacologically, it acts as a non-competitive antagonist at the **NMDA (N-methyl-D-aspartate) receptor**. Clinically, PCP intoxication is high-yield for NEET-PG due to its unique presentation of **rotatory nystagmus** (horizontal, vertical, or rotatory), extreme agitation, and decreased pain perception, which often leads to violent behavior. **Analysis of Incorrect Options:** * **LSD (Lysergic Acid Diethylamide):** Known as "Acid." It is a potent hallucinogen acting primarily on 5-HT2A receptors. It typically causes "trips" characterized by synesthesia (hearing colors/seeing sounds) and pupillary dilation. * **Heroin:** An opioid derivative (diacetylmorphine) known as "Smack" or "H." It is a depressant, not a hallucinogen, and overdose is characterized by the triad of coma, respiratory depression, and pinpoint pupils (miosis). * **Mescaline:** A naturally occurring hallucinogen derived from the **Peyote cactus**. While it produces effects similar to LSD, it is not referred to as angel dust. **High-Yield Clinical Pearls for NEET-PG:** 1. **PCP & Violence:** Patients on PCP often exhibit "superhuman strength" due to analgesia; physical restraint should be used with caution to avoid rhabdomyolysis. 2. **Nystagmus:** Vertical nystagmus is highly suggestive of PCP intoxication. 3. **Management:** Benzodiazepines are the first-line treatment for agitation; acidifying the urine (historically done) is no longer recommended due to the risk of worsening myoglobinuric renal failure.
Question 148: Confabulation is typically seen in which of the following conditions?
- A. Mania
- B. Depression
- C. Alcoholism (Correct Answer)
- D. Delirium
Explanation: **Explanation:** **Confabulation** is the unconscious filling of memory gaps with fabricated or distorted information. The patient is not intentionally lying but is attempting to maintain a sense of continuity in their narrative despite severe memory deficits. **Why Alcoholism is the Correct Answer:** Confabulation is a hallmark clinical feature of **Korsakoff’s Psychosis**, which is a chronic neurological sequela of chronic alcoholism caused by **Thiamine (Vitamin B1) deficiency**. It typically follows an untreated episode of Wernicke’s Encephalopathy. The underlying pathology involves damage to the **mammillary bodies** and the dorsomedial nucleus of the thalamus, leading to profound anterograde and retrograde amnesia. To compensate for this memory loss, patients "confabulate." **Analysis of Incorrect Options:** * **A. Mania:** Characterized by flight of ideas, pressure of speech, and grandiosity, but memory remains intact; hence, confabulation is not a feature. * **B. Depression:** May present with "Pseudodementia" where the patient complains of memory loss (often saying "I don't know"), but they do not fabricate memories. * **C. Delirium:** This is an acute disturbance of consciousness and attention. While patients are disoriented, the specific phenomenon of filling memory gaps with false stories (confabulation) is not a defining characteristic. **High-Yield Clinical Pearls for NEET-PG:** * **Wernicke’s Triad:** Ataxia, Ophthalmoplegia (6th nerve palsy), and Confusion (Global Encephalopathy). * **Korsakoff’s Syndrome:** Characterized by Amnesia (Anterograde > Retrograde) and Confabulation. * **Wernicke-Korsakoff Syndrome** is most commonly associated with chronic alcohol use but can occur in hyperemesis gravidarum or severe malnutrition. * **Treatment:** Always administer Thiamine **before** Glucose to prevent precipitating Wernicke’s Encephalopathy.
Question 149: Which of the following drugs is best avoided in a chronic alcoholic patient?
- A. Naltrexone
- B. Acamprostate
- C. Disulfiram
- D. Opioids (Correct Answer)
Explanation: ### Explanation The correct answer is **D. Opioids**. **Why Opioids are avoided:** Chronic alcohol consumption leads to significant central nervous system (CNS) depression and often results in liver dysfunction (cirrhosis or hepatitis). Opioids are also potent CNS depressants. When combined with alcohol, they produce a **synergistic effect**, leading to severe respiratory depression, coma, and death. Furthermore, alcoholics have a high propensity for cross-addiction; introducing opioids carries a significant risk of developing a secondary substance use disorder. **Analysis of Incorrect Options:** * **A. Naltrexone:** This is a first-line FDA-approved treatment for alcohol dependence. It is an opioid antagonist that reduces the "reward" or euphoria associated with drinking by blocking mu-opioid receptors. * **B. Acamprosate:** Another first-line treatment used to maintain abstinence. It modulates glutamate and GABA neurotransmission. It is particularly preferred in patients with liver disease as it is excreted renally. * **C. Disulfiram:** An aldehyde dehydrogenase inhibitor used as an aversive therapy. While it requires careful patient selection (due to the risk of the Disulfiram-Ethanol Reaction), it is a standard pharmacological intervention for chronic alcoholism, not a drug to be avoided in the context of general medical safety like opioids. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC) for Alcohol Withdrawal:** Benzodiazepines (e.g., Chlordiazepoxide, Diazepam). * **DOC for Withdrawal in Liver Failure:** "LOT" (Lorazepam, Oxazepam, Temazepam) as they undergo direct conjugation and do not rely on oxidative metabolism in the liver. * **Wernicke’s Encephalopathy:** Always give **Thiamine before Glucose** to prevent precipitating acute neurological deterioration. * **Acamprosate** is the drug of choice for patients with **liver cirrhosis**, whereas **Naltrexone** is contraindicated in acute hepatitis or liver failure.
Question 150: All of the following are true about cocaine addiction except?
- A. Myocardial infarction
- B. Seizures
- C. Comorbid addiction to alcohol
- D. Amantadine is the drug of choice (Correct Answer)
Explanation: **Explanation:** Cocaine is a potent central nervous system stimulant that acts by inhibiting the reuptake of dopamine, norepinephrine, and serotonin. **Why Option D is the Correct Answer (The False Statement):** There is **no FDA-approved "drug of choice"** for the pharmacological treatment of cocaine addiction. While **Amantadine** (a dopamine agonist) and Bromocriptine have been studied to alleviate withdrawal symptoms by addressing the "dopamine depletion" hypothesis, clinical trials have shown inconsistent results. The mainstay of treatment for cocaine addiction remains **Psychosocial interventions** (e.g., Cognitive Behavioral Therapy, Contingency Management). **Analysis of Incorrect Options (True Statements):** * **A. Myocardial Infarction:** Cocaine causes intense sympathetic stimulation, leading to coronary artery vasoconstriction, increased myocardial oxygen demand, and platelet aggregation. This can trigger an MI even in young patients with normal coronary arteries. * **B. Seizures:** Cocaine lowers the seizure threshold. Acute toxicity often presents with generalized tonic-clonic seizures due to its stimulatory effect on the CNS. * **C. Comorbid addiction to alcohol:** Polysubstance abuse is highly common among cocaine users. Specifically, concurrent use of alcohol and cocaine leads to the formation of **Cocaethylene** in the liver, which has a longer half-life and greater cardiotoxicity than cocaine alone. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Blocks reuptake of catecholamines at the presynaptic terminal. * **Formulation:** "Freebase" or "Crack" is the most potent and addictive form. * **Physical Sign:** **Mydriasis** (dilated pupils) is a hallmark of intoxication. * **Management of Toxicity:** **Benzodiazepines** are the first-line treatment for agitation and hypertension. **Beta-blockers are contraindicated** due to the risk of "unopposed alpha-stimulation," which can worsen hypertension and coronary vasospasm.
Practice by Chapter
Neurobiology of Addiction
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Alcohol Use Disorder
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Opioid Use Disorder
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Cannabis Use Disorder
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Stimulant Use Disorders
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Sedative, Hypnotic, and Anxiolytic Use Disorders
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Tobacco Use Disorder
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Hallucinogen-Related Disorders
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Substance Withdrawal Syndromes
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Pharmacotherapy for Substance Use Disorders
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Psychosocial Interventions
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Dual Diagnosis Management
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