Substance Use Disorders Practice Questions

Q: Which of the following is a paraphilia?

All the above. **Explanation:** Paraphilias are defined as intense and persistent sexual interests other than sexual interest in genital stimulation or preparatory fondling with phenotypically normal, physically mature, consenting human partners. According to the **DSM-5** and **ICD-11**, these disorders involve recurrent, intense sexual fantasies, urges, or behaviors that cause clinically significant distress or impairment. **Why "All the above" is correct:** * **Fetishism (Option A):** Involves the use of non-living objects (e.g., shoes, stockings) or a highly specific focus on non-genital body parts to achieve sexual arousal. * **Sexual Sadism (Option B):** Involves deriving sexual excitement from the physical or psychological suffering (including humiliation) of another person. * **Sexual Masochism (Option C):** Involves sexual arousal from the act of being humiliated, beaten, bound, or otherwise made to suffer. Since all three conditions are classic examples of paraphilic disorders, **Option D** is the correct choice. **High-Yield Clinical Pearls for NEET-PG:** * **Gender Distribution:** Paraphilias are almost exclusively diagnosed in **males**. * **Duration Criteria:** For a formal diagnosis under DSM-5, these interests must be present for at least **6 months**. * **Distinction:** A "Paraphilia" is the sexual interest itself, while a **"Paraphilic Disorder"** is a paraphilia that causes distress/impairment to the individual or involves non-consenting victims. * **Treatment:** The mainstay of pharmacological treatment for severe cases (to reduce libido) includes **Anti-androgens** (e.g., Cyproterone acetate) or **GnRH agonists** (e.g., Leuprolide). Cognitive Behavioral Therapy (CBT) is the preferred psychological intervention. * **Other common paraphilias:** Exhibitionism (exposure of genitals), Voyeurism (observing unsuspecting persons), and Frotteurism (touching/rubbing against non-consenting persons).

Q: What is the most severe manifestation of alcohol withdrawal syndrome?

Delirium tremens. **Explanation:** **Delirium Tremens (DT)** is the most severe and life-threatening manifestation of alcohol withdrawal, occurring in approximately 5% of patients, usually **48 to 96 hours** after the last drink. It is a medical emergency characterized by a "clouding of consciousness" (delirium) and severe autonomic hyperactivity (tachycardia, hypertension, fever, and diaphoresis). The underlying pathophysiology involves a profound neurochemical rebound due to the sudden removal of alcohol's inhibitory effect on GABA receptors and the compensatory overactivity of NMDA (glutamate) receptors. Untreated DT has a mortality rate of up to 20%, primarily due to cardiovascular collapse or hyperthermia. **Analysis of Incorrect Options:** * **Wernicke's Encephalopathy (A):** This is a neurological complication of chronic alcohol use due to **Thiamine (B1) deficiency**, not a manifestation of the withdrawal syndrome itself. * **Seizures (C):** Also known as "rum fits," these typically occur early (**6–48 hours**) after cessation. While serious, they are usually self-limiting and less life-threatening than the systemic collapse seen in DT. * **Alcoholic Hallucinosis (D):** This involves vivid auditory or visual hallucinations with a **clear sensorium** (the patient is alert and oriented). It occurs within 12–24 hours and lacks the autonomic instability and delirium that define the severity of DT. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline:** Tremors (6-12h) → Seizures (6-48h) → Hallucinosis (12-24h) → DT (48-96h). * **Drug of Choice:** Benzodiazepines (e.g., Diazepam, Lorazepam) are the gold standard for managing withdrawal. * **Prophylaxis:** Chlordiazepoxide is commonly used for detoxification. * **Distinction:** The hallmark of DT is **altered sensorium + autonomic instability**, whereas Hallucinosis has a **clear sensorium**.

Q: Which of the following drugs is known as Angel Dust?

Phencyclidine (PCP). **Explanation:** **Phencyclidine (PCP)**, commonly known as **"Angel Dust,"** is a dissociative anesthetic that acts primarily as a non-competitive antagonist at the **NMDA (N-methyl-D-aspartate) receptor**. It was originally developed as an anesthetic but was discontinued due to severe adverse effects, including postoperative delirium and hallucinations. **Why the other options are incorrect:** * **Cannabis:** Commonly known as Marijuana, Weed, or Pot. Its psychoactive component is Delta-9-THC. * **Cocaine:** Known as Coke, Snow, or Crack. It is a potent stimulant that inhibits the reuptake of dopamine, norepinephrine, and serotonin. * **Ecstasy (MDMA):** Also known as "Molly" or "Adam." It is a substituted amphetamine with both stimulant and hallucinogenic properties, primarily affecting serotonin levels. **Clinical Pearls for NEET-PG:** 1. **Classic Presentation:** A patient presenting with **vertical or horizontal nystagmus**, extreme agitation, and **decreased pain perception** (analgesia) is highly suggestive of PCP toxicity. 2. **Psychiatric Symptoms:** PCP can induce a state indistinguishable from schizophrenia, including paranoia and violent behavior. 3. **Management:** The primary treatment for PCP-induced agitation is **Benzodiazepines** (e.g., Diazepam). Acidification of urine is no longer routinely recommended due to the risk of metabolic acidosis. 4. **Ketamine Connection:** Ketamine is a structural analog of PCP but is less potent and has a shorter duration of action.

Q: What is the recommended loading dose of diazepam for managing alcohol withdrawal?

60-150 mg. **Explanation:** Alcohol withdrawal management focuses on preventing severe complications like seizures and delirium tremens. The **Loading Dose Strategy** (also known as front-loading) involves administering long-acting benzodiazepines to achieve rapid sedation and then allowing the drug’s long half-life to provide a "self-tapering" effect. **Why C is Correct:** For moderate to severe alcohol withdrawal, **Diazepam** is the drug of choice due to its rapid onset and long-acting metabolites. The standard recommended loading dose is **60–150 mg**. Typically, 10–20 mg is administered every 1–2 hours until the patient is adequately sedated (using scales like CIWA-Ar). This high cumulative dose is necessary to counteract the profound NMDA receptor upregulation and GABA-A receptor downregulation seen in chronic alcohol use. **Why Other Options are Incorrect:** * **A & B (20-30 mg / 25-85 mg):** These doses are generally insufficient for a true "loading" protocol in severe withdrawal. While 20-30 mg might suffice for mild anxiety, it fails to provide the seizure prophylaxis required in high-risk patients. * **D (200-300 mg):** These doses are excessively high and significantly increase the risk of over-sedation and respiratory depression, even in patients with high tolerance. **High-Yield NEET-PG Pearls:** * **Drug of Choice (General):** Chlordiazepoxide or Diazepam (long-acting). * **Drug of Choice (Liver Failure/Elderly):** **LOT** (Lorazepam, Oxazepam, Temazepam) because they undergo direct glucuronidation and do not have active metabolites. * **Wernicke’s Encephalopathy:** Always give **Thiamine before Glucose** to prevent precipitating acute Wernicke’s. * **Delirium Tremens:** Occurs 48–96 hours after the last drink; characterized by autonomic instability and clouded consciousness.

Q: Which of the following drugs is NOT used in alcohol dependence to prevent relapse?

Fluoxetine. **Explanation:** The goal of pharmacological treatment in alcohol dependence is to maintain abstinence and reduce craving. **Fluoxetine** is a Selective Serotonin Reuptake Inhibitor (SSRI) primarily used for Depression and Anxiety disorders. While it may be used to treat comorbid depression in an alcoholic patient, it has **no proven efficacy** in preventing relapse or reducing alcohol consumption in non-depressed patients. **Analysis of Options:** * **Acamprosate (Option C):** An NMDA receptor antagonist and GABA-A agonist. It restores the chemical balance in the brain disrupted by chronic alcohol use. It is a first-line drug specifically used to **maintain abstinence** (reduce the "desire" to drink). * **Nalmefene (Option B):** An opioid system modulator (mu/delta antagonist and kappa partial agonist). Similar to Naltrexone, it is used to **reduce the "reward"** associated with drinking and decrease heavy drinking days. * **Topiramate (Option D):** An anti-epileptic that facilitates GABA neurotransmission and inhibits glutamate. It is an "off-label" but evidence-based second-line agent used to **reduce cravings** and promote abstinence. **High-Yield Clinical Pearls for NEET-PG:** * **FDA-Approved drugs for Alcohol Dependence:** Disulfiram (Aversion therapy), Acamprosate, and Naltrexone. * **Acamprosate** is preferred in patients with **liver disease** (excreted renally). * **Naltrexone** is preferred in patients with **renal failure** (metabolized by the liver) but is contraindicated in acute hepatitis or opioid users. * **Disulfiram** acts by inhibiting **Aldehyde Dehydrogenase**, leading to the accumulation of Acetaldehyde (causing the unpleasant Disulfiram-Ethanol Reaction).

Q: A young man with known heroin addiction is brought to the emergency department in an unconscious state. On examination, the patient has decreased bowel sounds, depressed respiration, and pinpoint pupils. What is the treatment of choice for this patient?

IV naloxone. ### Explanation **Correct Answer: B. IV naloxone** **Medical Concept:** The patient presents with the classic **"Opioid Overdose Triad"**: coma (unconscious state), respiratory depression, and miosis (pinpoint pupils). The presence of decreased bowel sounds further confirms opioid toxicity, as opioids slow gastrointestinal motility. In an acute emergency involving respiratory depression, the treatment of choice is **IV Naloxone**. Naloxone is a competitive opioid receptor antagonist with a high affinity for $\mu$-receptors, rapidly reversing the life-threatening effects of the overdose. **Why Incorrect Options are Wrong:** * **A. Oral Naltrexone:** While naltrexone is an opioid antagonist, it is used for **relapse prevention** in detoxified patients. It has a slow onset and is administered orally, making it useless and dangerous (due to aspiration risk) in an acute emergency. * **C. Oral Diazepam:** Diazepam is a benzodiazepine. Giving a sedative to a patient with respiratory depression would worsen the condition and potentially lead to death. * **D. Oral Buprenorphine:** This is a partial $\mu$-agonist used for **maintenance therapy** or substitution. Administering it during an acute overdose would not reverse respiratory depression and could complicate the clinical picture. **High-Yield Clinical Pearls for NEET-PG:** * **Naloxone Half-life:** It has a shorter half-life (30–90 mins) than most opioids (e.g., methadone). Patients must be monitored closely for **"re-narcotization"** as the antagonist wears off. * **Pinpoint Pupils Exception:** Pethidine (Meperidine) overdose typically presents with **mydriasis** (dilated pupils) rather than miosis due to its atropine-like effects. * **Diagnostic Triad:** Coma + Pinpoint pupils + Respiratory rate < 12/min = Opioid Overdose until proven otherwise.

Q: Delirium tremens is typically seen in which of the following conditions?

Alcohol withdrawal. **Explanation:** **Delirium Tremens (DT)** is the most severe and life-threatening manifestation of **alcohol withdrawal**. It typically occurs 48 to 96 hours after the last drink in chronic heavy drinkers. The underlying pathophysiology involves a sudden drop in blood alcohol levels, leading to a state of **NMDA receptor overactivity** and **GABAergic hypoactivity**. This results in profound autonomic instability (tachycardia, hypertension, fever) and altered sensorium characterized by clouding of consciousness, vivid hallucinations (often visual or tactile), and severe tremors. **Analysis of Options:** * **Alcohol withdrawal (Correct):** DT is the "Stage 4" of withdrawal. It is a medical emergency with a mortality rate of up to 5% if untreated. * **Alcohol overdose:** Presents as central nervous system depression, respiratory depression, and coma (the "drunk" state), rather than the hyper-excitable state of delirium. * **Morphine poisoning:** Opioid overdose typically presents with the classic triad of miosis (pinpoint pupils), coma, and respiratory depression. * **Atropine poisoning:** While it causes "central anticholinergic syndrome" (delirium, hallucinations), it is clinically distinct. The mnemonic "Mad as a hatter, Red as a beet, Dry as a bone" characterizes atropine toxicity, not alcohol withdrawal. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline:** Minor withdrawal (6–12h) → Seizures (12–48h) → Hallucinosis (12–48h) → **Delirium Tremens (48–96h)**. * **Drug of Choice:** Benzodiazepines (e.g., **Diazepam** or **Lorazepam**). Lorazepam is preferred in patients with liver failure (mnemonic: **OTL** - Oxazepam, Temazepam, Lorazepam). * **Hallucinations:** In DT, consciousness is clouded; in Alcoholic Hallucinosis, the sensorium is clear. * **Mortality:** Usually due to cardiovascular collapse, hyperthermia, or self-injury.

Q: Which of the following drugs may induce a psychosis that is easily confused with, or misdiagnosed as, paranoid schizophrenia?

Amphetamines. **Explanation:** **Amphetamines** are potent central nervous system stimulants that increase synaptic concentrations of dopamine. The "Dopamine Hypothesis" of schizophrenia suggests that overactivity of dopamine in the mesolimbic pathway leads to positive symptoms. Consequently, amphetamine-induced psychosis can present with a clinical picture nearly identical to **Paranoid Schizophrenia**, characterized by: * Prominent persecutory delusions. * Auditory and visual hallucinations. * Clear sensorium (unlike delirium). * Extreme agitation or aggressive behavior. **Why the other options are incorrect:** * **Barbiturates & Benzodiazepines (A & C):** These are CNS depressants. Their acute intoxication typically presents with sedation, ataxia, and slurred speech. While their *withdrawal* can cause delirium and hallucinations, the acute state does not mimic paranoid schizophrenia. * **Heroin (B):** As an opioid, heroin causes euphoria, respiratory depression, and "pinpoint" pupils. It does not typically induce a functional-appearing psychotic state. **High-Yield Clinical Pearls for NEET-PG:** * **Formication:** A classic sign of stimulant psychosis (Amphetamines/Cocaine) is the sensation of insects crawling under the skin (also known as "Magnan’s sign" or "cocaine bugs"). * **Differentiation:** Amphetamine psychosis usually resolves within days to weeks of abstinence, whereas schizophrenia is a chronic, deteriorating condition. * **Management:** Acute agitation in stimulant psychosis is managed with **Benzodiazepines** (first-line) or high-potency antipsychotics like Haloperidol.

Question 1

Which of the following is a paraphilia?

Accepted Answer

All the above

Answer

Fetishism

Answer

Sadism

Answer

Masochism

Question 2

What is the most severe manifestation of alcohol withdrawal syndrome?

Accepted Answer

Delirium tremens

Answer

Wernicke's encephalopathy

Answer

Seizures

Answer

Alcoholic hallucinosis

Question 3

Which of the following drugs is known as Angel Dust?

Accepted Answer

Phencyclidine (PCP)

Answer

Cannabis

Answer

Cocaine

Answer

Ecstasy

Question 4

A 48-year-old male presents to the ER with confusion and shaking of the entire body. He has a history of alcoholism. What is the most likely cause of delirium tremens in an alcoholic patient?

Accepted Answer

Acute infection

Answer

Small consumption of alcohol

Answer

Gradual withdrawal from alcohol

Answer

Fatty liver

Question 5

What is the recommended loading dose of diazepam for managing alcohol withdrawal?

Accepted Answer

60-150 mg

Answer

20-30 mg

Answer

25-85 mg

Answer

200-300 mg

Question 6

Which of the following drugs is NOT used in alcohol dependence to prevent relapse?

Accepted Answer

Fluoxetine

Answer

Nalmefene

Answer

Acamprosate

Answer

Topiramate

Question 7

A young man with known heroin addiction is brought to the emergency department in an unconscious state. On examination, the patient has decreased bowel sounds, depressed respiration, and pinpoint pupils. What is the treatment of choice for this patient?

Accepted Answer

IV naloxone

Answer

Oral naltrexone

Answer

Oral diazepam

Answer

Oral buprenorphine

Question 8

Delirium tremens is typically seen in which of the following conditions?

Accepted Answer

Alcohol withdrawal

Answer

Alcohol overdose

Answer

Morphine poisoning

Answer

Atropine poisoning

Question 9

Which of the following drugs may induce a psychosis that is easily confused with, or misdiagnosed as, paranoid schizophrenia?

Accepted Answer

Amphetamines

Answer

Barbiturates

Answer

Heroin

Answer

Benzodiazepines

Question 10

In a chronic alcoholic, what is the cause of memory loss and confabulation?

Accepted Answer

Korsakoff's psychosis

Answer

Wernicke's encephalopathy

Answer

Alcoholic hallucinations

Answer

Delirium tremens

Substance Use Disorders — MCQs

Substance Use Disorders — MCQs

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