Substance Use Disorders Practice Questions

Q: Which of the following is NOT seen in Korsakoff's syndrome?

Hallucinations. **Explanation:** Korsakoff’s Syndrome is a chronic neuropsychiatric disorder caused by a deficiency of **Thiamine (Vitamin B1)**, typically following untreated Wernicke’s Encephalopathy in chronic alcoholics. It is characterized by a profound **amnestic syndrome**. **Why Hallucinations is the correct answer:** Hallucinations are **not** a diagnostic feature of Korsakoff’s syndrome. While they may occur in other alcohol-related conditions like Delirium Tremens (visual) or Alcoholic Hallucinosis (auditory), Korsakoff’s is primarily a disorder of memory, not perception. **Analysis of Incorrect Options:** * **Clear Consciousness:** Unlike Wernicke’s Encephalopathy or Delirium, patients with Korsakoff’s syndrome are alert and have a **clear sensorium**. Their level of consciousness and general cognitive functions (like IQ) remain relatively intact. * **Inability to learn new things:** This refers to **Anterograde Amnesia**, the hallmark of the syndrome. Patients cannot form new memories, though their immediate registration (digit span) is usually preserved. * **Confabulation:** This is a classic feature where patients fill in memory gaps with fabricated or distorted stories. It is often a compensatory mechanism for their severe amnesia. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomical Site:** Lesions are most commonly found in the **Dorsomedial nucleus of the Thalamus** and the **Mammillary bodies**. * **Wernicke’s Triad:** Ataxia, Ophthalmoplegia (6th nerve palsy), and Confusion (Global Encephalopathy). * **Korsakoff’s Psychosis:** Characterized by the "Amnestic-Confabulatory" syndrome. * **Treatment:** High-dose parenteral Thiamine. Always give Thiamine **before** Glucose to avoid precipitating Wernicke’s.

Q: What is the main symptom of Korsakoff's psychosis?

Confabulation. **Explanation:** The correct answer is **D. Confabulation**. Korsakoff’s Psychosis (or Korsakoff’s Syndrome) is a chronic neuropsychiatric condition resulting from severe **Thiamine (Vitamin B1) deficiency**, most commonly seen in chronic alcoholics. It is characterized by **anterograde and retrograde amnesia**. Because patients have a profound inability to form new memories, they unconsciously fill in memory gaps with fabricated or distorted stories; this hallmark symptom is known as **confabulation**. **Analysis of Incorrect Options:** * **A, B, and C (Ataxia, Global Confusion, and Ophthalmoplegia):** These three symptoms constitute the classic clinical triad of **Wernicke’s Encephalopathy**, which is the acute, reversible phase of thiamine deficiency. While Wernicke’s and Korsakoff’s often occur together (Wernicke-Korsakoff Syndrome), the "psychosis" or chronic phase is specifically defined by the memory deficit and confabulation. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** The most characteristic brain lesions are found in the **mammillary bodies** and the dorsomedial nucleus of the thalamus. * **Reversibility:** Wernicke’s is a medical emergency and is potentially reversible with thiamine; Korsakoff’s is often permanent and irreversible. * **Management Rule:** Always administer **Thiamine before Glucose** in a malnourished or alcoholic patient to prevent precipitating Wernicke’s Encephalopathy. * **Memory Profile:** In Korsakoff’s, **immediate memory** is usually preserved, but **short-term memory** is severely impaired.

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 the following features are seen in Wernicke's encephalopathy except?

Confabulation. **Explanation:** Wernicke’s Encephalopathy (WE) is an acute, reversible neuropsychiatric emergency caused by **Thiamine (Vitamin B1) deficiency**, most commonly seen in chronic alcoholics. The diagnosis is clinical and is classically defined by a **triad** of symptoms: 1. **Ophthalmoplegia (Option A):** Most commonly manifests as **6th cranial nerve (Abducens) palsy**, leading to horizontal nystagmus or lateral rectus paralysis. 2. **Ataxia (Option B):** Primarily affecting gait and stance due to cerebellar involvement. 3. **Confusion (Option D):** An altered mental state or global cognitive impairment. **Why Confabulation is the correct answer:** **Confabulation** (the fabrication of memories to fill gaps) is a hallmark feature of **Korsakoff Psychosis**, not acute Wernicke’s Encephalopathy. While the two conditions are related (Wernicke-Korsakoff Syndrome), Korsakoff is the **chronic, irreversible** stage characterized by anterograde/retrograde amnesia and confabulation. Confabulation occurs when the acute confusion of WE clears, leaving behind a profound memory deficit. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad:** Remember the mnemonic **CAN** (Confusion, Ataxia, Nystagmus/Ophthalmoplegia). * **Pathology:** Characterized by petechial hemorrhages in the **mammillary bodies** (most common site) and periaqueductal gray matter. * **Treatment Rule:** Always administer **Thiamine before Glucose**. Giving IV glucose first in a thiamine-deficient patient can precipitate or worsen WE by consuming the remaining B1 cofactors during glycolysis. * **Reversibility:** Ataxia and ophthalmoplegia usually respond rapidly to thiamine, but the memory deficits of Korsakoff are often permanent.

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: A chronic alcoholic blames the family environment as a cause of his alcoholism. This phenomenon is known as:

Rationalization. **Explanation:** **1. Why Rationalization is Correct:** Rationalization is a defense mechanism where an individual justifies maladaptive behavior or feelings by providing logical, socially acceptable, but false reasons. In the context of substance use disorders, the patient attempts to shift the blame for their addiction to external circumstances (e.g., "I drink because my family is stressful" or "I drink because I lost my job"). This allows the patient to avoid the guilt and responsibility associated with their alcoholism by creating a plausible excuse. **2. Analysis of Incorrect Options:** * **Projection:** This involves attributing one's own unacknowledged feelings or impulses onto someone else. For example, an alcoholic accusing their spouse of being an angry person when, in fact, the patient is the one harboring suppressed anger. * **Denial:** This is the most common defense mechanism in alcoholism. It involves a complete refusal to acknowledge the reality of the situation (e.g., "I don't have a drinking problem; I can stop whenever I want"). * **Sublimation:** This is a mature defense mechanism where socially unacceptable impulses are transformed into socially productive actions (e.g., an aggressive person becoming a professional boxer). **Clinical Pearls for NEET-PG:** * **Defense Mechanisms in Alcoholism:** Denial and Rationalization are the two most frequently tested mechanisms associated with substance abuse. * **Identification:** If the patient **denies** the problem exists, it is Denial. If the patient **justifies** why the problem exists using external excuses, it is Rationalization. * **Wernicke-Korsakoff Syndrome:** Remember that chronic alcoholics often use **Confabulation** (filling memory gaps with fabricated stories), which is a characteristic feature of Korsakoff psychosis.

Question 1

What is the primary pharmacotherapy for tobacco addiction?

Accepted Answer

Nicotine replacement therapy

Answer

Bupropion

Answer

Varenicline

Answer

Naltrexone

Question 2

Which of the following is NOT seen in Korsakoff's syndrome?

Accepted Answer

Hallucinations

Answer

Clear consciousness

Answer

Inability to learn new things

Answer

Confabulation

Question 3

What is the main symptom of Korsakoff's psychosis?

Accepted Answer

Confabulation

Answer

Ataxia

Answer

Global confusion

Answer

Opthalmoplegia

Question 4

A 40-year-old patient with a 20-year history of constant marijuana use presents with withdrawal symptoms. Which is the most frequently encountered symptom?

Accepted Answer

None of the above

Answer

Yawning

Answer

Seizures

Answer

Irritability

Question 5

One of the following drug classes is known to produce a psychosis that closely resembles paranoid schizophrenia.

Accepted Answer

Amphetamines

Answer

Barbiturates

Answer

Opioids

Answer

Benzodiazepines

Question 6

'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 7

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

Accepted Answer

Opioids

Answer

LSD

Answer

Cocaine

Answer

Amphetamine

Question 8

All the following features are seen in Wernicke's encephalopathy except?

Accepted Answer

Confabulation

Answer

6th cranial nerve palsy

Answer

Ataxia

Answer

Confusion

Question 9

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

Accepted Answer

Escitalopram

Answer

Methylphenidate

Answer

Buprenorphine

Answer

Dextro-propoxyphene

Question 10

A chronic alcoholic blames the family environment as a cause of his alcoholism. This phenomenon is known as:

Accepted Answer

Rationalization

Answer

Projection

Answer

Denial

Answer

Sublimation

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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