Substance Use Disorders — MCQs

Substance Use Disorders Indian Medical PG Practice Questions and MCQs

Question 221: Which drugs are known to cause both physical and psychological dependence?

A. Opioids
B. Alcohol
C. Nicotine
D. All the above (Correct Answer)

Explanation: ### Explanation The core concept in addiction psychiatry is the distinction between **Psychological Dependence** (craving and a compulsive need to use a drug for its pleasurable effects or to avoid distress) and **Physical Dependence** (the body’s adaptation to the drug, manifested by **tolerance** and a specific **withdrawal syndrome** upon cessation). **Why "All the above" is correct:** Most drugs of abuse that act on the brain's reward system (specifically the dopaminergic pathways in the nucleus accumbens) produce both types of dependence: * **Opioids (e.g., Heroin, Morphine):** These cause profound physical dependence. Withdrawal results in "flu-like" symptoms (rhinorrhea, lacrimation, yawning) and severe autonomic hyperactivity. Psychological craving is intense and long-lasting. * **Alcohol:** It is a potent CNS depressant. Physical dependence is evidenced by life-threatening withdrawal symptoms like **Delirium Tremens** and seizures. Psychological dependence is characterized by the "loss of control" over drinking. * **Nicotine:** While often underestimated, nicotine has a very high addictive potential. Physical dependence is marked by irritability, weight gain, and insomnia upon quitting, while psychological dependence is driven by the rapid dopamine spike following inhalation. **Clinical Pearls for NEET-PG:** * **Pure Psychological Dependence:** Classically associated with **Hallucinogens (LSD)** and **Cannabis** (though mild physical withdrawal is now recognized in DSM-5 for cannabis, it is predominantly psychological). * **The "CAGE" Questionnaire:** The most popular screening tool for Alcohol Use Disorder. * **Withdrawal Management:** Benzodiazepines are the drug of choice for Alcohol withdrawal; Methadone or Buprenorphine are used for Opioid substitution. * **Highest Addictive Potential:** Nicotine is often cited as having the highest "capture rate" (percentage of users who become dependent).

Question 222: Which of the following is characteristic of alcohol withdrawal?

A. Hallucination (Correct Answer)
B. Illusion
C. Delusion
D. Drowsiness

Explanation: **Explanation:** Alcohol withdrawal occurs due to the sudden cessation of alcohol intake, leading to a state of **CNS hyperexcitability** (due to GABA-receptor downregulation and NMDA-receptor upregulation). **Why Hallucination is Correct:** Hallucinations are a hallmark feature of alcohol withdrawal, typically occurring 12–48 hours after the last drink. The most characteristic type is **Alcoholic Hallucinosis**, where the patient experiences vivid sensory perceptions (most commonly **auditory**, but can be visual or tactile) in a state of **clear consciousness**. This is distinct from Delirium Tremens, where hallucinations occur alongside clouded consciousness and autonomic instability. **Why other options are incorrect:** * **B. Illusion:** While misinterpretations of stimuli can occur, they are not the defining diagnostic characteristic of the withdrawal syndrome compared to hallucinations. * **C. Delusion:** Delusions (fixed false beliefs) are more characteristic of chronic conditions like Alcoholic Paranoia or Schizophrenia, rather than the acute withdrawal phase. * **D. Drowsiness:** Alcohol is a CNS depressant; therefore, withdrawal presents with **insomnia and agitation**, not drowsiness. Drowsiness is a sign of alcohol intoxication or sedative overdose. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline:** * 6–12 hours: Insomnia, tremors, anxiety. * 12–24 hours: Alcoholic hallucinosis (Clear sensorium). * 24–48 hours: Withdrawal seizures ("Rum fits" – Generalized Tonic-Clonic). * 48–72 hours: **Delirium Tremens** (Medical emergency; characterized by confusion and autonomic hyperactivity). * **Drug of Choice:** Benzodiazepines (e.g., Diazepam, Lorazepam). * **Wernicke’s Encephalopathy Triad:** Ataxia, Ophthalmoplegia, and Confusion (due to Thiamine/B1 deficiency). Always give Thiamine before Glucose.

Question 223: Frigidity is defined as:

A. Inability to initiate sexual arousal in a female. (Correct Answer)
B. Inability to initiate sexual arousal in a male.
C. Ejaculation occurring immediately after penetration.
D. None of the above.

Explanation: ### Explanation **Concept Overview:** The term **Frigidity** is a traditional (though now largely outdated in modern clinical manuals like DSM-5) psychiatric term used to describe **Female Sexual Interest/Arousal Disorder**. It refers to a persistent or recurrent inability to attain or maintain the physiological and psychological response of sexual excitement (such as lubrication or swelling) in a female, or a lack of desire for sexual activity. **Analysis of Options:** * **Option A (Correct):** Frigidity specifically pertains to the female gender. It characterizes the failure of the sexual arousal response, which may be due to psychological factors (anxiety, trauma, depression) or physiological causes. * **Option B (Incorrect):** Inability to initiate or maintain sexual arousal in a male is termed **Erectile Dysfunction (ED)** or Impotence. * **Option C (Incorrect):** Ejaculation occurring immediately after or even before penetration with minimal sexual stimulation is defined as **Premature Ejaculation**. * **Option D (Incorrect):** Option A provides the standard historical definition of the term. **NEET-PG Clinical Pearls:** * **Modern Nomenclature:** In the **DSM-5**, Hypoactive Sexual Desire Disorder and Female Sexual Arousal Disorder have been merged into a single entity: **Female Sexual Interest/Arousal Disorder (FSIAD)**. * **Vaginismus:** Often confused with frigidity, this is the involuntary spasm of the pelvic floor muscles making penetration painful or impossible. * **Dyspareunia:** Refers to genital pain associated with sexual intercourse. * **Management:** Treatment usually involves a combination of Psychotherapy (Sensate Focus exercises), addressing underlying relationship issues, and treating comorbid conditions like depression.

Question 224: Which of the following best describes the relationship between physical and psychic dependence in nicotine dependence?

A. Physical dependence is greater than psychic dependence
B. Physical dependence is less than psychic dependence (Correct Answer)
C. Physical dependence is equal to psychic dependence
D. There is no tolerance

Explanation: In nicotine dependence, the core of the addiction lies in the intense **psychic (psychological) dependence**, which is significantly more profound than the physical dependence. ### **Explanation of the Correct Answer** Nicotine is one of the most addictive substances known. **Psychic dependence** refers to the compulsive craving, the behavioral reinforcement (hand-to-mouth habit), and the perceived need for the drug to handle stress or maintain focus. While nicotine does cause **physical dependence** (manifesting as withdrawal symptoms like irritability, anxiety, and increased appetite), these physical symptoms are relatively short-lived, usually peaking within 2–3 days and subsiding within 2–4 weeks. However, the psychic dependence—the "urge" to smoke—can persist for years, leading to high relapse rates. Therefore, the psychological drive is the dominant force in nicotine addiction. ### **Analysis of Incorrect Options** * **Option A:** Incorrect. While physical withdrawal exists, it is not the primary reason why long-term cessation is difficult; the psychological "habit" is much stronger. * **Option C:** Incorrect. The intensity of the craving (psychic) far outlasts the physiological need (physical). * **Option D:** Incorrect. Tolerance is a hallmark of nicotine use. Users rapidly develop tolerance to the nausea and dizziness initially caused by nicotine, requiring more frequent use to achieve the same neurochemical "reward." ### **NEET-PG High-Yield Pearls** * **Mechanism:** Nicotine acts on **α4β2 nicotinic acetylcholine receptors** in the Ventral Tegmental Area (VTA), releasing dopamine in the Nucleus Accumbens (the reward pathway). * **Withdrawal:** Unlike alcohol or benzodiazepines, nicotine withdrawal is **not life-threatening**. * **Pharmacotherapy:** * **Varenicline:** Partial agonist at α4β2 receptors (Most effective). * **Bupropion:** Norepinephrine-Dopamine Reuptake Inhibitor (NDRI); contraindicated in seizure disorders. * **Fagerström Test:** Used to clinically assess the intensity of physical dependence on nicotine.

Question 225: A 40-year-old man with a history of alcohol dependence is admitted to the hospital for a knee injury. Which of the following is the most common cause of delirium within 3 days postoperatively?

A. Pain medication
B. Infection
C. Delirium tremens (Correct Answer)
D. Stress of surgery

Explanation: ### Explanation **Correct Option: C. Delirium Tremens** In a patient with a known history of alcohol dependence, the most common cause of delirium in the early postoperative period (typically 48–96 hours after the last drink) is **Delirium Tremens (DTs)**. Hospitalization and surgery impose forced abstinence. Alcohol is a CNS depressant that enhances GABAergic tone and inhibits NMDA receptors. Sudden cessation leads to a "rebound" CNS hyperexcitability due to decreased GABA activity and up-regulated NMDA receptors. DTs is the most severe form of withdrawal, characterized by altered sensorium, autonomic instability (tachycardia, hypertension), and hallucinations. **Analysis of Incorrect Options:** * **A. Pain medication:** While opioids can cause sedation or confusion (especially in the elderly), they are less likely than withdrawal to cause frank delirium in a middle-aged patient with a specific history of alcohol dependence. * **B. Infection:** Postoperative infections (like UTI or pneumonia) can cause delirium, but they typically manifest later in the recovery period rather than within the first 72 hours. * **D. Stress of surgery:** While physiological stress can contribute to postoperative cognitive dysfunction, it is a non-specific factor. In the context of alcohol dependence, the biochemical withdrawal syndrome is the primary driver. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline of Alcohol Withdrawal:** * 6–12 hours: Insomnia, tremors, anxiety. * 12–24 hours: Alcoholic hallucinosis (clear sensorium). * 24–48 hours: Withdrawal seizures ("Rum fits"). * **48–96 hours: Delirium Tremens.** * **Drug of Choice:** Benzodiazepines (e.g., Diazepam, Lorazepam) are the gold standard for management. * **Mortality:** Untreated DTs has a mortality rate of up to 20%, usually due to arrhythmia or respiratory failure. * **Wernicke’s Prophylaxis:** Always administer **Thiamine** before Glucose to prevent precipitating Wernicke’s Encephalopathy.

Question 226: In delirium tremens, all of the following are true, except:

A. Gross tremor
B. Seen in alcoholic withdrawal
C. Seizures may occur
D. Orientation is clear (Correct Answer)

Explanation: **Explanation:** **Delirium Tremens (DT)** is the most severe form of alcohol withdrawal, typically occurring 48–96 hours after the last drink. The hallmark of any "delirium" is a **clouding of consciousness**, which makes **Option D (Orientation is clear)** the correct "except" choice. In DT, patients are profoundly disoriented to time, place, and person. **Analysis of Options:** * **Option A (Gross tremor):** DT is characterized by intense autonomic hyperactivity. Coarse, rhythmic, "gross" tremors are a cardinal feature, often accompanied by tachycardia, hypertension, and diaphoresis. * **Option B (Seen in alcoholic withdrawal):** This is the fundamental etiology. It occurs due to the sudden cessation of alcohol, leading to a "rebound" hyperexcitability of the NMDA receptors and downregulation of GABA receptors. * **Option C (Seizures may occur):** While "Rum Fits" (withdrawal seizures) usually occur 6–48 hours after cessation, they can precede or occur during the onset of DT. Their presence indicates a high risk for progressing to full-blown delirium. **Clinical Pearls for NEET-PG:** 1. **Hallucinations:** In DT, these are most commonly **visual** (e.g., seeing small animals or insects—micropsia/liliputian hallucinations) or tactile (formication), unlike schizophrenia where they are primarily auditory. 2. **Mortality:** If untreated, DT has a mortality rate of up to 20%, usually due to cardiovascular collapse or hyperthermia. 3. **Treatment of Choice:** **Benzodiazepines** (Chlordiazepoxide or Diazepam) are the gold standard. In patients with liver failure, use "LOT" (Lorazepam, Oxazepam, Temazepam). 4. **Key Distinction:** Alcohol Hallucinosis occurs with a **clear sensorium**, whereas Delirium Tremens occurs with **clouded consciousness**.

Question 227: What substance is known to cause "bad trips"?

A. Flunitrazepam
B. Lysergic acid diethylamide (LSD) (Correct Answer)
C. Toluene
D. Anabolic androgenic steroids

Explanation: **Explanation:** **Lysergic acid diethylamide (LSD)** is a potent hallucinogen that acts primarily as a partial agonist at the **5-HT2A receptors**. The term **"bad trip"** refers to an acute adverse psychological reaction characterized by intense anxiety, terrifying hallucinations (often visual), paranoia, and a loss of control. These episodes can lead to "panic-like" states or "psychedelic crises." **Analysis of Options:** * **LSD (Correct):** Known for causing profound sensory distortions and "bad trips." Management of an acute bad trip involves a "talking down" technique in a quiet environment or the use of benzodiazepines. * **Flunitrazepam:** A potent benzodiazepine (often called the "date rape drug") that causes sedation and anterograde amnesia, rather than hallucinogenic "trips." * **Toluene:** An inhalant found in glues/paints. While it causes euphoria and dizziness, its primary clinical concerns are "Sudden Sniffing Death Syndrome" (due to arrhythmias) and leukoencephalopathy. * **Anabolic Androgenic Steroids:** These are associated with "Roid Rage" (increased aggression and irritability) and mood swings, but not classic hallucinogenic bad trips. **High-Yield Clinical Pearls for NEET-PG:** * **Flashbacks (Hallucinogen Persisting Perception Disorder):** Recurrence of the "trip" symptoms weeks or months after the last dose of LSD. * **Synesthesia:** A classic LSD phenomenon where senses blend (e.g., "hearing colors" or "seeing sounds"). * **Pupillary Findings:** LSD typically causes **Mydriasis** (dilated pupils), unlike opioids which cause miosis. * **Tolerance:** LSD shows rapid tolerance (tachyphylaxis) and cross-tolerance with other hallucinogens like Psilocybin.

Question 228: Withdrawal of heroin produces all the following symptoms except?

A. Insomnia
B. Piloerection
C. Mydriasis
D. Miosis (Correct Answer)

Explanation: **Explanation:** The core concept to master for opioid-related questions is that **withdrawal symptoms are generally the physiological opposite of the drug’s acute effects.** Heroin is an opioid agonist. Acute opioid intoxication is characterized by **miosis** (pinpoint pupils) due to stimulation of the parasympathetic pathway via the Edinger-Westphal nucleus. Therefore, during **withdrawal**, the sympathetic nervous system becomes overactive, leading to **mydriasis** (pupillary dilation). Since the question asks for the symptom that does *not* occur during withdrawal, **Miosis (Option D)** is the correct answer as it is a sign of intoxication, not withdrawal. **Analysis of Incorrect Options:** * **Insomnia (Option A):** Opioids are CNS depressants that cause sedation. Withdrawal leads to CNS rebound hyper-excitability, manifesting as severe insomnia and restlessness. * **Piloerection (Option B):** This is a classic sign of sympathetic surge during opioid withdrawal. It gives the skin the appearance of a plucked turkey, leading to the slang term "cold turkey." * **Mydriasis (Option C):** As explained, pupillary dilation is a hallmark sign of the sympathetic overactivity seen in opioid withdrawal. **NEET-PG High-Yield Pearls:** * **Objective Signs of Withdrawal:** Look for the "3 Ls": **L**acrimation, **L**ow mood (dysphoria), and **L**oose stools (diarrhea), along with rhinorrhea and yawning. * **Grade of Severity:** Piloerection and mydriasis indicate a more established withdrawal state compared to early symptoms like anxiety. * **Management:** Clonidine (alpha-2 agonist) is used to treat autonomic hyperactivity; Methadone or Buprenorphine are used for detoxification and maintenance. * **Exception:** Meperidine (Pethidine) is an opioid that uniquely causes **mydriasis** during intoxication (due to its atropine-like action), unlike heroin.

Question 229: Which one of the following medications is used to aid in smoking cessation?

A. Buspirone
B. Bupropion (Correct Answer)
C. Naltrexone
D. Fluoxetine

Explanation: **Explanation:** **Bupropion** (specifically the sustained-release formulation) is an FDA-approved first-line non-nicotine pharmacotherapy for smoking cessation. Its mechanism involves the inhibition of neuronal reuptake of **Dopamine and Norepinephrine**. By increasing dopamine levels in the nucleus accumbens, it mimics the reward pathway of nicotine, thereby reducing withdrawal symptoms and the urge to smoke. **Analysis of Incorrect Options:** * **Buspirone (A):** An anxiolytic and partial $5-HT_{1A}$ agonist used primarily for Generalized Anxiety Disorder (GAD). It has no proven efficacy in smoking cessation. * **Naltrexone (C):** An opioid antagonist used primarily in the management of **Alcohol dependence** (to reduce cravings) and **Opioid use disorder** (to prevent relapse). * **Fluoxetine (D):** An SSRI used for Depression, OCD, and Bulimia. While depression is often comorbid with smoking, SSRIs are not standard treatments for nicotine withdrawal. **High-Yield Clinical Pearls for NEET-PG:** * **Varenicline** is another first-line agent; it is a **partial agonist** at the $\alpha_4\beta_2$ nicotinic acetylcholine receptors. * **Contraindication:** Bupropion is strictly contraindicated in patients with **Seizure disorders** or **Eating disorders** (Bulimia/Anorexia) as it lowers the seizure threshold. * **Timing:** Patients should start Bupropion 1–2 weeks *before* their target "quit date" to reach steady-state plasma levels. * **Weight Gain:** Bupropion is often preferred for smokers concerned about post-cessation weight gain.

Question 230: A patient presents with coarse tremors, arousal, sweating, irritability, and tachycardia. A history of daily alcohol intake is present. What is the most likely diagnosis?

A. Alcohol withdrawal (Correct Answer)
B. Delirium tremens
C. Korsakoff's psychosis
D. Opioid withdrawal

Explanation: ### Explanation **1. Why Alcohol Withdrawal is Correct:** The patient presents with the classic **autonomic hyperactivity** and **central nervous system irritability** seen in early alcohol withdrawal. Alcohol is a CNS depressant that enhances GABA (inhibitory) and inhibits NMDA (excitatory) receptors. Chronic use leads to downregulation of GABA and upregulation of NMDA. When alcohol is abruptly stopped, the brain enters a state of **hyperexcitability**. * **Key Symptoms:** Coarse tremors (the most common sign), tachycardia, hypertension, diaphoresis (sweating), and irritability. These typically appear within 6–24 hours after the last drink. **2. Why the Other Options are Incorrect:** * **Delirium Tremens (DT):** While DT is a severe form of withdrawal, it is characterized by **clouding of consciousness (delirium)** and disorientation. Since the question does not mention confusion, hallucinations, or global disorientation, "Alcohol Withdrawal" is the more accurate, broader diagnosis. DT usually occurs 48–96 hours after the last drink. * **Korsakoff’s Psychosis:** This is a late-stage complication of Thiamine (B1) deficiency. It presents with **anterograde amnesia** and **confabulation**, not acute autonomic symptoms like tremors and sweating. * **Opioid Withdrawal:** While it shares symptoms like tachycardia and irritability, it is specifically characterized by **miosis (initially), yawning, lacrimation, rhinorrhea, and "gooseflesh" (piloerection)**, which are absent here. **3. High-Yield Clinical Pearls for NEET-PG:** * **First sign of alcohol withdrawal:** Tremors (6–8 hours). * **Most common seizure type:** Generalized Tonic-Clonic Seizures ("Rum fits"), occurring 12–48 hours after cessation. * **Drug of Choice (DOC):** Benzodiazepines (e.g., Diazepam, Lorazepam). * **Wernicke’s Encephalopathy Triad:** Ataxia, Confusion, and Ophthalmoplegia (reversible). * **Korsakoff’s:** Irreversible memory loss; involves damage to the **mammillary bodies**.

Practice by Chapter

Neurobiology of Addiction

Practice Questions

Alcohol Use Disorder

Practice Questions

Opioid Use Disorder

Practice Questions

Cannabis Use Disorder

Practice Questions

Stimulant Use Disorders

Practice Questions

Sedative, Hypnotic, and Anxiolytic Use Disorders

Practice Questions

Tobacco Use Disorder

Practice Questions

Hallucinogen-Related Disorders

Practice Questions

Substance Withdrawal Syndromes

Practice Questions

Pharmacotherapy for Substance Use Disorders

Practice Questions

Psychosocial Interventions

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Dual Diagnosis Management

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