Substance Use Disorders Practice Questions

Q: 'Marchiafava-Bignami' syndrome is characterized by which of the following?

A complication associated with chronic alcoholism. **Explanation:** **Marchiafava-Bignami Disease (MBD)** is a rare, progressive neurological complication classically associated with **chronic alcoholism** and malnutrition. The underlying pathophysiology involves the **symmetrical demyelination and necrosis of the corpus callosum**. While originally described in Italian men consuming heavy red wine, it is now understood to be linked to the toxic effects of alcohol combined with Vitamin B complex deficiencies. * **Why Option B is Correct:** MBD is a direct complication of chronic alcohol use. Clinical presentation includes altered mental status, seizures, gait abnormalities, and "interhemispheric disconnection syndrome." MRI is the gold standard for diagnosis, showing characteristic lesions in the corpus callosum (the "sandwich sign"). * **Why Other Options are Incorrect:** * **Option A:** An addiction to hospitalization (seeking medical care for feigned illness) is known as **Munchausen Syndrome** (Factitious Disorder). * **Option C:** Congenital disorders of myelin formation are termed **Leukodystrophies** (e.g., Krabbe disease, Metachromatic leukodystrophy). MBD is an *acquired* demyelinating condition. * **Option D:** Opioid withdrawal presents with autonomic hyperactivity (mydriasis, lacrimation, rhinorrhea, diarrhea) and is unrelated to callosal demyelination. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Site:** Corpus Callosum (specifically the central layers of the body). * **Imaging Finding:** "Sandwich Sign" on MRI (involvement of the central corpus callosum with sparing of the dorsal and ventral layers). * **Differential Diagnosis:** Wernicke’s Encephalopathy (which involves the mammillary bodies and periaqueductal gray). * **Treatment:** High-dose Thiamine (Vitamin B1) and nutritional supplementation, though the prognosis remains guarded.

Q: "Chasing the dragon" phenomena occurs with which class of drugs?

Opioids. **Explanation:** **Correct Answer: A. Opioids** "Chasing the dragon" is a specific method of drug inhalation primarily associated with **Heroin** (diacetylmorphine). In this process, the powdered drug is heated on aluminum foil with a flame underneath. The user then inhales the resulting white vapor through a small tube or straw. The term "chasing" refers to the user’s movement to keep the liquid bead of melting heroin moving across the foil while pursuing the rising smoke. This method is preferred by some users to avoid the risks of intravenous injection (like HIV or Hepatitis C) while still achieving a rapid "rush." **Why other options are incorrect:** * **B. LSD:** As a potent hallucinogen, LSD is typically ingested orally (via blotter paper). It is not smoked or vaporized. * **C. Cocaine:** While "Crack" cocaine is smoked, the term "chasing the dragon" is etiologically and culturally specific to heroin. Cocaine use is more commonly associated with "snorting" (insufflation) or "freebasing." * **D. Amphetamines:** Methamphetamine is often smoked in a glass pipe (ice), but this is not referred to as chasing the dragon. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Opioid Overdose:** Pinpoint pupils (miosis), respiratory depression, and altered sensorium (coma). * **Withdrawal Symptoms:** Characterized by "wet" symptoms—lacrimation, rhinorrhea, sweating, yawning, and dilated pupils (mydriasis). * **Treatment:** **Naloxone** is the drug of choice for acute overdose; **Methadone** and **Buprenorphine** are used for substitution therapy. * **Flashbacks:** Most commonly associated with **LSD** (Hallucinogen Persisting Perception Disorder).

Q: All of the following psychotropic drugs have abuse liability, EXCEPT:

Escitalopram. **Explanation:** The core concept behind **abuse liability** is the ability of a drug to produce immediate pleasurable effects (euphoria), leading to reinforcement and compulsive drug-seeking behavior. This is typically mediated by a rapid increase in dopamine levels within the brain's reward circuit (the mesolimbic pathway). **Why Escitalopram is the Correct Answer:** Escitalopram is a **Selective Serotonin Reuptake Inhibitor (SSRI)**. Unlike stimulants or opioids, SSRIs do not cause an acute surge in dopamine in the nucleus accumbens and do not produce euphoria. They have a delayed onset of therapeutic action (2–4 weeks) and lack addictive potential. While patients may experience "discontinuation syndrome" if stopped abruptly, this is a physiological withdrawal, not a manifestation of psychological dependence or abuse. **Analysis of Incorrect Options:** * **Methylphenidate:** A CNS stimulant used in ADHD. It blocks the reuptake of norepinephrine and dopamine. Due to its dopaminergic action, it has a high potential for abuse and is classified as a Schedule II controlled substance. * **Buprenorphine:** A partial mu-opioid agonist. While used in Opioid Substitution Therapy (OST), it still possesses opioid properties that can lead to misuse, especially among those with existing opioid use disorders. * **Dextro-propoxyphene:** An opioid analgesic. It was historically widely abused for its sedative and euphoric effects before being banned or restricted in many regions due to toxicity and abuse potential. **High-Yield Clinical Pearls for NEET-PG:** * **Drugs with NO abuse liability:** SSRIs, SNRIs, Antipsychotics, Lithium, and Buspirone. * **Drugs with HIGH abuse liability:** Benzodiazepines, Barbiturates, Opioids, and Stimulants (Amphetamines). * **Z-drugs (Zolpidem, Zopiclone):** Despite being marketed as safer alternatives to Benzodiazepines, they **do** carry a risk of dependence and abuse.

Q: Which of the following is characteristic of alcohol withdrawal?

Hallucination. **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.

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

Orientation is clear. **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**.

Q: Which of the following statements about Alcoholics Anonymous is FALSE?

It provides incentives for quitting alcohol.. **Explanation:** **Alcoholics Anonymous (AA)** is a globally recognized mutual aid fellowship dedicated to abstinence-based recovery from alcoholism. **Why Option D is the Correct (False) Statement:** AA operates on the principle of **intrinsic motivation** and spiritual growth rather than extrinsic rewards. It does **not provide financial or material incentives** (such as money, vouchers, or gifts) to its members for staying sober. In contrast, behavioral therapies like **Contingency Management** use tangible incentives to reinforce abstinence, but this is not a feature of the AA model. **Analysis of Other Options:** * **Option A (True):** AA is the prototypical **self-help group** (or mutual support group). It is non-professional, self-supporting, and independent of hospitals or political bodies. * **Option B (True):** The foundation of the program is the **"12-Step Program,"** which involves admitting powerlessness over alcohol, seeking help from a higher power, and making amends to others. * **Option C (True):** Meetings are led by **recovered peers** (sponsors) and volunteers who share their experiences. There are no professional therapists or doctors leading the sessions. **High-Yield Clinical Pearls for NEET-PG:** * **Al-Anon:** A sister organization specifically for the **families and friends** of alcoholics. * **Alateen:** A support group specifically for **teenagers** affected by someone else's drinking. * **Anonymity:** The "Anonymous" part of the name signifies that members' identities are protected, and the focus remains on the collective recovery rather than individual personalities. * **Total Abstinence:** Unlike "controlled drinking" models, AA advocates for total, lifelong abstinence from alcohol.

Q: Withdrawal of heroin produces all the following symptoms except?

Miosis. **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 1

'Marchiafava-Bignami' syndrome is characterized by which of the following?

Accepted Answer

A complication associated with chronic alcoholism

Answer

An addiction to hospitalization

Answer

A congenital disorder of myelin formation

Answer

A withdrawal syndrome from opioid use

Question 2

"Chasing the dragon" phenomena occurs with which class of drugs?

Accepted Answer

Opioids

Answer

LSD

Answer

Cocaine

Answer

Amphetamine

Question 3

All of the following psychotropic drugs have abuse liability, EXCEPT:

Accepted Answer

Escitalopram

Answer

Methylphenidate

Answer

Buprenorphine

Answer

Dextro-propoxyphene

Question 4

Which of the following is characteristic of alcohol withdrawal?

Accepted Answer

Hallucination

Answer

Illusion

Answer

Delusion

Answer

Drowsiness

Question 5

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

Accepted Answer

Physical dependence is less than psychic dependence

Answer

Physical dependence is greater than psychic dependence

Answer

Physical dependence is equal to psychic dependence

Answer

There is no tolerance

Question 6

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?

Accepted Answer

Delirium tremens

Answer

Pain medication

Answer

Infection

Answer

Stress of surgery

Question 7

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

Accepted Answer

Orientation is clear

Answer

Gross tremor

Answer

Seen in alcoholic withdrawal

Answer

Seizures may occur

Question 8

Which of the following statements about Alcoholics Anonymous is FALSE?

Accepted Answer

It provides incentives for quitting alcohol.

Answer

It is a self-help group.

Answer

It follows 12 steps to quit alcohol.

Answer

It includes recovered patients and volunteers.

Question 9

Withdrawal of heroin produces all the following symptoms except?

Accepted Answer

Miosis

Answer

Insomnia

Answer

Piloerection

Answer

Mydriasis

Question 10

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?

Accepted Answer

Alcohol withdrawal

Answer

Delirium tremens

Answer

Korsakoff's psychosis

Answer

Opioid withdrawal

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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