Addiction Medicine — MCQs

Addiction Medicine Indian Medical PG Practice Questions and MCQs

Question 11: Which of the following statements regarding bronchial cysts is FALSE?

A. 50-70% are seen in the lung.
B. Usually seen in the mediastinum.
C. May be premalignant.
D. Commonly gets infected. (Correct Answer)

Explanation: Bronchogenic cysts are congenital anomalies arising from the abnormal budding of the primitive foregut. Understanding their distribution and clinical behavior is crucial for NEET-PG. **Why Option D is the Correct (False) Statement:** While bronchogenic cysts *can* become infected, it is **not common**. Most bronchogenic cysts remain asymptomatic for years and are often discovered incidentally on chest X-rays. Infection typically occurs only if there is a communication with the tracheobronchial tree, which is rare. Therefore, stating they "commonly" get infected is clinically inaccurately compared to their usual silent progression. **Analysis of Other Options:** * **Option A & B:** Bronchogenic cysts are classified by location. Approximately **70-85% are mediastinal** [1] (most common in the subcarinal or paratracheal regions), while the remainder (around 15-30%) are **intrapulmonary**. While the percentages in the options vary slightly by textbook, the core concept remains that they are predominantly mediastinal but frequently seen in the lung parenchyma as well. * **Option C:** Although rare, bronchogenic cysts have **premalignant potential**. There are documented cases of adenocarcinoma and squamous cell carcinoma arising from the epithelial lining of the cyst, which is why surgical excision is often recommended even in asymptomatic patients. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Lined by ciliated columnar epithelium (respiratory epithelium) and often contain cartilage, smooth muscle, and mucous glands in the wall. * **Most Common Site:** Subcarinal region (Mediastinum) [1]. * **Imaging:** Appear as well-circumscribed, water-density (or proteinaceous) masses on CT [1]. They do not typically enhance with contrast. * **Management:** Surgical resection (VATS or thoracotomy) is the treatment of choice to prevent future complications like compression, infection, or malignancy.

Question 12: In a fetus with spina bifida before 24 weeks of gestation, the characteristic cerebellar shape mimics which of the following?

A. Banana (Correct Answer)
B. Orange
C. Swiss cheese
D. Pea

Explanation: The correct answer is **Banana (Option A)**. This classic sonographic finding is part of the **Arnold-Chiari II malformation**, which is almost universally associated with open neural tube defects like spina bifida. **Pathophysiology:** In spina bifida, the leakage of cerebrospinal fluid (CSF) through the spinal defect leads to low pressure in the posterior fossa. This causes the hindbrain to herniate downwards through the foramen magnum. As the cerebellum is pulled inferiorly, it becomes compressed and wraps around the brainstem, losing its normal dumbbell shape and assuming a curved, **"banana-like"** appearance. **Analysis of Incorrect Options:** * **B. Orange:** This is not a recognized sign in fetal neurosonography. However, the **"Lemon sign"** (scalloping of the frontal bones) is another key marker of spina bifida. * **C. Swiss cheese:** This term typically refers to the appearance of the ventricular septum in certain types of **Congenital Heart Disease** (multiple VSDs) or the appearance of the placenta in **molar pregnancies**. * **D. Pea:** This is not a standard medical descriptor for cerebellar morphology. **High-Yield Clinical Pearls for NEET-PG:** * **Lemon Sign:** Frontal bone flattening; seen in 90% of cases before 24 weeks but may disappear in the third trimester. * **Banana Sign:** More specific than the lemon sign for spina bifida and often persists into the third trimester. * **Ventriculomegaly:** Often accompanies these signs due to obstructive hydrocephalus. * **Maternal Alpha-Fetoprotein (MSAFP):** Elevated in open spina bifida; used as a screening tool before ultrasound.

Question 13: Wernicke's encephalopathy can be prevented by:

A. IV saline
B. Large amounts of glucose
C. Thiamine supplement (Correct Answer)
D. Imipramine

Explanation: Wernicke’s Encephalopathy (WE) is an acute, reversible neurological emergency caused by a deficiency of Thiamine (Vitamin B1) [1]. Thiamine is a vital co-factor for key enzymes in cerebral glucose metabolism (e.g., pyruvate dehydrogenase) [2]. In chronic alcoholics or malnourished states, thiamine stores are depleted. Without thiamine, glucose oxidation fails, leading to mitochondrial dysfunction and focal brain lesions, particularly in the mammillary bodies and thalamus [3]. Therefore, Thiamine supplementation is the definitive preventive and therapeutic measure [4]. **Analysis of Options:** * **IV Saline (A):** While useful for rehydration, it does not address the underlying biochemical deficiency causing neuronal damage. * **Large amounts of glucose (B):** This is a **dangerous** intervention if given before thiamine. Glucose administration increases the demand for thiamine-dependent metabolism, which can acutely exhaust remaining thiamine stores and precipitate or worsen Wernicke’s Encephalopathy [4]. * **Imipramine (D):** This is a Tricyclic Antidepressant (TCA) used for depression or enuresis; it has no role in the pathophysiology or prevention of thiamine deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Encephalopathy (confusion), Oculomotor dysfunction (nystagmus/ophthalmoplegia), and Ataxia. (Note: The full triad is present in only ~16-38% of cases). * **Korsakoff Syndrome:** The chronic, irreversible stage characterized by anterograde amnesia and **confabulation** [5]. * **Golden Rule:** Always administer **Thiamine BEFORE or concurrent with Glucose** in any patient with suspected malnutrition or alcoholism to prevent iatrogenic Wernicke’s [4]. * **MRI Finding:** Increased T2/FLAIR signal intensity in the **mammillary bodies** is highly specific [3].

Question 14: Which route is not typically used by addicts for morphine administration?

A. Intravenous
B. Intramuscular
C. Subcutaneous
D. Oral (Correct Answer)

Explanation: **Explanation:** The primary goal of drug abuse is to achieve a rapid "rush" or intense euphoria. This is directly dependent on the **speed of onset** and the **peak plasma concentration** of the drug in the brain [1]. **Why Oral is the Correct Answer:** Morphine has a significant **first-pass metabolism** in the liver when taken orally. This results in low bioavailability (approximately 20-40%) and a slow, gradual increase in blood levels [2]. For an addict, the oral route fails to produce the immediate "high" or "kick" desired, making it the least preferred route for abuse. **Analysis of Incorrect Options:** * **Intravenous (IV):** This is the most common route for advanced addicts [1]. It provides 100% bioavailability and an almost instantaneous peak concentration in the brain, leading to an immediate, intense euphoria. * **Subcutaneous (SC):** Often referred to as **"skin popping,"** this route is frequently used by addicts when their veins become sclerosed or difficult to access due to repeated IV injections. * **Intramuscular (IM):** This route provides faster absorption than the oral route and avoids first-pass metabolism, making it a viable alternative for users when intravenous access is unavailable. **High-Yield Clinical Pearls for NEET-PG:** * **Skin Popping:** Look for multiple circular, atrophic scars on the extremities in a patient with a history of drug abuse; this is a classic sign of subcutaneous morphine/heroin injection [3]. * **Complications:** IV drug use is a major risk factor for **Infective Endocarditis** (commonly involving the Tricuspid valve) and blood-borne pathogens like **HIV and Hepatitis B/C**. * **Triad of Opioid Overdose:** Pinpoint pupils (miosis), respiratory depression, and altered mental status (coma) [3]. * **Antidote:** Naloxone (pure opioid antagonist) is the treatment of choice for acute toxicity [3].

Question 15: A 35-year-old man has fasting and postprandial blood sugar within normal limits, but his urine sugar is 3 plus (+++). What is the most likely diagnosis?

A. Renal glycosuria (Correct Answer)
B. Pancreatic insufficiency
C. Alimentary glycosuria
D. High carbohydrate diet taken in the morning

Explanation: ### Explanation **Correct Answer: A. Renal glycosuria** **Mechanism:** The physiological hallmark of **Renal Glycosuria** is the presence of glucose in the urine despite **normal blood glucose levels**. Under normal conditions, the kidneys reabsorb almost 100% of filtered glucose in the proximal convoluted tubule (PCT) via SGLT2 transporters [1]. This reabsorption continues until the blood glucose exceeds the **Renal Threshold (approx. 180 mg/dL)** [1]. In renal glycosuria, there is a functional defect in these transporters or a reduced threshold, causing glucose to "leak" into the urine even when blood sugar is within the normal range (as seen in this patient). **Analysis of Incorrect Options:** * **B. Pancreatic insufficiency:** This would lead to a deficiency in insulin production (Diabetes Mellitus). In this case, both fasting and postprandial blood sugars would be significantly **elevated**, which contradicts the clinical presentation [2]. * **C. Alimentary glycosuria:** This occurs when there is rapid gastric emptying (e.g., post-gastrectomy), leading to a rapid spike in blood glucose that exceeds the renal threshold temporarily. However, the **postprandial blood sugar would be high** in these cases. * **D. High carbohydrate diet:** In a healthy individual, a high carb intake will increase insulin secretion to maintain blood glucose within normal limits. Unless the patient is diabetic, the renal threshold will not be breached. **NEET-PG High-Yield Pearls:** * **Benign Condition:** Isolated renal glycosuria is usually asymptomatic and does not progress to Diabetes Mellitus. * **Fanconi Syndrome:** If renal glycosuria is associated with phosphaturia, aminoaciduria, and uricosuria, suspect a generalized PCT defect (Fanconi Syndrome). * **Pregnancy:** A physiological decrease in the renal threshold for glucose is common during pregnancy, often leading to benign glycosuria. * **SGLT2 Inhibitors:** Drugs like **Dapagliflozin** (used in DM-2) pharmacologically induce renal glycosuria to lower blood glucose.

Question 16: Alcohol consumption is associated with all of the following conditions EXCEPT:

A. Gastric or esophageal carcinoma
B. Acute pancreatitis
C. Coronary artery disease (Correct Answer)
D. Chronic liver disease

Explanation: The correct answer is **Coronary Artery Disease (CAD)**. While heavy alcohol consumption is a major risk factor for various systemic pathologies, moderate alcohol consumption (specifically 1–2 drinks per day) has historically been associated with a **cardioprotective effect**. It is known to increase HDL-cholesterol levels, decrease platelet aggregation, and improve insulin sensitivity, thereby potentially reducing the risk of CAD. In contrast, heavy consumption leads to alcoholic cardiomyopathy and arrhythmias (Holiday Heart Syndrome) rather than traditional atherosclerotic CAD. **Why the other options are incorrect:** * **Gastric or esophageal carcinoma:** Alcohol is a potent carcinogen. It acts as a solvent for tobacco smoke (synergistic effect) and its metabolite, acetaldehyde, causes DNA damage. It is a primary risk factor for Squamous Cell Carcinoma of the esophagus and is associated with gastric malignancies. * **Acute pancreatitis:** Alcohol is the second most common cause of acute pancreatitis (after gallstones). It causes premature activation of digestive enzymes within the pancreatic acini and increases the permeability of ductules. * **Chronic liver disease:** Alcohol is a direct hepatotoxin [1]. Chronic ingestion leads to a predictable progression from steatosis (fatty liver) to alcoholic hepatitis and eventually micronodular cirrhosis [1]. **High-Yield Clinical Pearls for NEET-PG:** * **CAGE Questionnaire:** Most sensitive 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) [2]. * **MCV:** An elevated Mean Corpuscular Volume (macrocytosis) is often the earliest laboratory indicator of chronic alcohol abuse, even in the absence of anemia. * **AST:ALT Ratio:** A ratio >2:1 is highly suggestive of alcoholic liver disease.

Question 17: A 30-year-old female patient presents with non-progressive dysphagia for both solids and liquids. What is the characteristic finding on barium swallow that will confirm the probable diagnosis?

A. Dilated esophagus with a narrow lower end (rat tail esophagus)
B. Multiple sacculations and pseudodiverticula (corkscrew esophagus) (Correct Answer)
C. Narrow and irregular esophageal lumen
D. Stricture ulcer in the esophagus

Explanation: The clinical presentation of **non-progressive dysphagia** for both solids and liquids in a young patient is characteristic of **Diffuse Esophageal Spasm (DES)**. Unlike Achalasia, where dysphagia is progressive, DES involves intermittent, high-amplitude, uncoordinated contractions of the esophageal smooth muscle [1]. **1. Why the Correct Answer is Right:** In DES, the simultaneous contractions lead to the compartmentalization of the esophagus, creating an appearance of **multiple sacculations and pseudodiverticula**. On a barium swallow, this manifests as the classic **"Corkscrew Esophagus"** or "Rosary Bead" appearance. This occurs because the tertiary contractions prevent the bolus from moving smoothly, distorting the esophageal contour [2]. **2. Analysis of Incorrect Options:** * **Option A (Rat tail/Bird’s beak):** This is the hallmark of **Achalasia Cardia** [1]. While Achalasia also involves dysphagia for both solids and liquids, it is typically **progressive** and associated with a failure of the Lower Esophageal Sphincter (LES) to relax [1]. * **Option C (Narrow/Irregular lumen):** This suggests **Esophageal Carcinoma**. Malignancy typically presents in older patients with **progressive** dysphagia, initially for solids and later for liquids, often accompanied by significant weight loss [2]. * **Option D (Stricture/Ulcer):** This is characteristic of **Reflux Esophagitis** or chronic GERD leading to Peptic Stricture. Dysphagia here is usually for solids and follows a long history of heartburn [2]. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** While barium swallow shows the "corkscrew" sign, **Manometry** is the most sensitive test (showing simultaneous, multi-peaked contractions >20% of swallows) [2]. * **Clinical Feature:** DES is often associated with **retrosternal chest pain** that can mimic angina (precipitated by cold liquids) [2]. * **Treatment:** First-line includes Nitrates or Calcium Channel Blockers (CCBs) to relax smooth muscle [2].

Question 18: What is the antiepileptic of choice in post-diabetic peripheral neuropathy?

A. Pregabalin (Correct Answer)
B. Amitriptyline
C. Carbamazepine
D. Duloxetine

Explanation: **Explanation:** The management of **Painful Diabetic Peripheral Neuropathy (DPN)** involves several classes of drugs, but **Pregabalin** is currently considered the first-line antiepileptic of choice. **Why Pregabalin is Correct:** Pregabalin is a calcium channel modulator that binds to the **̡2-̈́ subunit of voltage-gated calcium channels** in the CNS. This reduces the release of excitatory neurotransmitters (like glutamate and substance P), thereby inhibiting pain signaling [1]. It is FDA-approved for DPN and is preferred due to its superior safety profile, predictable pharmacokinetics, and faster onset of action compared to other agents. **Analysis of Incorrect Options:** * **Amitriptyline (Option B):** While highly effective and often used as a first-line agent (especially in resource-limited settings), it is a **Tricyclic Antidepressant (TCA)**, not an antiepileptic. It is also limited by anticholinergic side effects (dry mouth, urinary retention) and cardiac risks. * **Carbamazepine (Option C):** This is the drug of choice for **Trigeminal Neuralgia**. It is generally not preferred for DPN due to its side effect profile and drug-drug interactions. * **Duloxetine (Option D):** This is an **SNRI** (Serotonin-Norepinephrine Reuptake Inhibitor). Like Amitriptyline, it is a first-line treatment for DPN but does not belong to the antiepileptic class. **High-Yield Clinical Pearls for NEET-PG:** * **First-line classes for DPN:** Gabapentinoids (Pregabalin/Gabapentin), SNRIs (Duloxetine), and TCAs (Amitriptyline). * **Gabapentin vs. Pregabalin:** Pregabalin has better bioavailability and a more linear dose-response curve than Gabapentin [1]. * **Side Effects:** Dizziness and somnolence are the most common side effects of Pregabalin. * **DOC for Trigeminal Neuralgia:** Carbamazepine. * **DOC for Post-herpetic Neuralgia:** Gabapentin/Pregabalin or Topical Lidocaine.

Question 19: All of the following are true about Primary Biliary Cirrhosis except?

A. Increase in 5'-nucleotidase
B. Median age of presentation is 50 years
C. Most common cause of cholangitis in children (Correct Answer)
D. PBC frequently associated with CREST syndrome

Explanation: Explanation: Primary Biliary Cirrhosis (now commonly termed **Primary Biliary Cholangitis**) is a chronic, progressive autoimmune liver disease characterized by the destruction of small intrahepatic bile ducts, leading to cholestasis and cirrhosis [1]. **Why Option C is the correct answer (False statement):** PBC is almost exclusively a disease of **adults**, typically affecting women between the ages of 30 and 65 [1]. It is **not** a pediatric condition. The most common cause of cholestasis and biliary-related illness in children is **Biliary Atresia**, not PBC. **Analysis of other options:** * **Option A (True):** PBC is a cholestatic liver disease. Therefore, biochemical markers of cholestasis, such as **Alkaline Phosphatase (ALP)** and **5'-nucleotidase**, are characteristically elevated [1]. * **Option B (True):** The median age of presentation is approximately **50 years**. It has a strong female predilection (9:1 female-to-male ratio) [1]. * **Option D (True):** PBC is frequently associated with other autoimmune conditions [1]. Up to 70% of patients have Sjögren’s syndrome. It is also significantly associated with **CREST syndrome** (Limited Scleroderma), thyroiditis, and Celiac disease [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Marker:** Anti-Mitochondrial Antibody (**AMA**) is positive in >95% of cases (M2 subtype is specific) [1]. * **Histology:** Characterized by "Florid duct lesions" (granulomatous destruction of bile ducts). * **Clinical Presentation:** Pruritus (often the earliest symptom) and fatigue, followed by jaundice and xanthomas [1]. * **Treatment of Choice:** Ursodeoxycholic acid (UDCA) slows disease progression. * **Mnemonic:** The "4 Ms" of PBC: **M**iddle-aged women, **M**2-AMA antibodies, **M** IgM elevation, and **M**anagement with UDCA.

Question 20: Wilson's disease is best diagnosed by?

A. Increased serum ceruloplasmin
B. Increased urinary copper excretion (Correct Answer)
C. Decreased liver copper
D. Absence of Kayser-Fleischer rings

Explanation: Wilson’s Disease (Hepatolenticular Degeneration) is an autosomal recessive disorder caused by mutations in the **ATP7B gene**, leading to impaired biliary copper excretion and defective incorporation of copper into ceruloplasmin [1]. **Why Option B is correct:** In Wilson’s disease, the inability of the liver to process copper leads to an accumulation of "free" (non-ceruloplasmin bound) copper in the serum. This free copper is filtered by the kidneys, resulting in **increased 24-hour urinary copper excretion (>100 μg/day)**. This is one of the most reliable and widely used screening and diagnostic tests, especially in symptomatic patients [1]. **Why other options are incorrect:** * **A. Increased serum ceruloplasmin:** In Wilson’s disease, serum ceruloplasmin levels are typically **decreased** (<20 mg/dL) due to the failure of the liver to synthesize holoceruloplasmin [2]. * **C. Decreased liver copper:** Liver copper levels are actually **increased** (>250 μg/g dry weight). A liver biopsy for quantitative copper estimation remains the "gold standard" for diagnosis if other tests are inconclusive [1]. * **D. Absence of Kayser-Fleischer (KF) rings:** KF rings (copper deposition in Descemet’s membrane) are present in 95% of patients with neurological symptoms and about 50-60% of those with hepatic presentations. Their absence does not rule out the disease, but their presence is a hallmark sign [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Screening Test of Choice:** Serum Ceruloplasmin (decreased) [2]. * **Most Sensitive/Best Initial Diagnostic Test:** 24-hour urinary copper excretion [1]. * **Gold Standard:** Liver biopsy for quantitative copper. * **MRI Brain Sign:** "Face of the Giant Panda" sign in the midbrain. * **Treatment:** Penicillamine (chelator) is the drug of choice; Zinc is used for maintenance or in asymptomatic siblings (prevents absorption).

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