Addiction Medicine — MCQs

Addiction Medicine Indian Medical PG Practice Questions and MCQs

Question 21: Which of the following pathological agents is implicated in pseudogout?

A. Sodium monourate
B. Calcium oxalate
C. Calcium pyrophosphate (Correct Answer)
D. Sodium pyrophosphate

Explanation: **Explanation:** **Pseudogout**, clinically known as **Calcium Pyrophosphate Deposition (CPPD) disease**, is a crystal-induced arthropathy. The correct answer is **Calcium pyrophosphate (Option C)** because the condition is caused by the precipitation of calcium pyrophosphate dihydrate crystals within the joint space and articular cartilage (chondrocalcinosis). These crystals are typically **rhomboid-shaped** and exhibit **weak positive birefringence** under polarized light microscopy. **Analysis of Incorrect Options:** * **Option A (Sodium monourate):** These crystals are responsible for **Gout**. They appear as needle-shaped crystals with strong negative birefringence. * **Option B (Calcium oxalate):** These crystals are commonly associated with nephrolithiasis (kidney stones) or systemic oxalosis, but not typically with pseudogout. * **Option D (Sodium pyrophosphate):** This is a chemical compound used in food additives and dental products; it is not a biological agent implicated in crystal arthropathies. **High-Yield Clinical Pearls for NEET-PG:** 1. **Demographics:** Unlike gout (which favors middle-aged men), pseudogout is more common in the **elderly** and affects both sexes equally. 2. **Target Joint:** The **knee** is the most common site involved (Gout typically involves the 1st MTP joint). 3. **Radiology:** Look for **Chondrocalcinosis** (linear calcification of articular cartilage). 4. **Associated Metabolic Conditions:** Always screen for "The 3 H's": **H**yperparathyroidism, **H**emochromatosis, and **H**ypomagnesemia (also Hypothyroidism). 5. **Treatment:** Acute attacks are managed with NSAIDs, colchicine, or intra-articular steroids.

Question 22: Rome II criteria are used for the diagnosis of which condition?

A. Irritable bowel syndrome (Correct Answer)
B. Inflammatory bowel disease
C. Gastrointestinal tumours
D. Neuroendocrine tumours

Explanation: The **Rome Criteria** are a set of international consensus standards used to diagnose **Functional Gastrointestinal Disorders (FGIDs)**, where no structural or biochemical abnormality is found. **Irritable Bowel Syndrome (IBS)** is the most common FGID, and the Rome II criteria (published in 1999) were specifically designed to standardize its diagnosis based on clinical symptoms like abdominal pain, bloating, and altered bowel habits [1]. * **Option A (Correct):** Rome II criteria define IBS as at least 12 weeks (not necessarily consecutive) of abdominal discomfort or pain in the preceding 12 months that has two of three features: relief with defecation, onset associated with a change in stool frequency, or onset associated with a change in stool form [1]. * **Option B (Incorrect):** Inflammatory Bowel Disease (Crohn’s or Ulcerative Colitis) is an organic inflammatory condition diagnosed via endoscopy, biopsy, and imaging, not symptom-based functional criteria. * **Options C & D (Incorrect):** Gastrointestinal and Neuroendocrine tumours are structural/malignant pathologies diagnosed through histopathology and biochemical markers (e.g., Chromogranin A, 5-HIAA). **High-Yield Clinical Pearls for NEET-PG:** * **Evolution of Criteria:** While the question asks about Rome II, be aware that **Rome IV (2016)** is the current gold standard. It defines IBS as recurrent abdominal pain (at least 1 day/week in the last 3 months) associated with 2 or more criteria related to defecation or stool consistency. * **Manning Criteria:** Another historical scoring system used for IBS. * **Red Flags:** Rome criteria should only be applied in the absence of "alarm symptoms" (weight loss, occult blood, anemia, or nocturnal diarrhea), which necessitate further investigation to rule out malignancy or IBD [1].

Question 23: A 5-year-old child presents with non-blanching purpura over the buttocks and lower limbs along with colicky abdominal pain. Further evaluation revealed deposition of IgA immune complexes. What is the most likely diagnosis?

A. Henoch-Schonlein Purpura (Correct Answer)
B. Kawasaki Disease
C. Wegener's Granulomatosis
D. Takayasu Disease

Explanation: **Explanation:** The clinical presentation of non-blanching purpura (palpable purpura) [2] localized to the buttocks and lower limbs, combined with colicky abdominal pain in a child, is the classic triad of **Henoch-Schönlein Purpura (HSP)** [1], now also known as **IgA Vasculitis**. [1] **1. Why Option A is Correct:** HSP is a small-vessel vasculitis characterized by the deposition of **IgA-dominant immune complexes** in the vessel walls. [1] It typically follows an upper respiratory tract infection. The hallmark features include: * **Skin:** Palpable purpura (gravity-dependent distribution). [2] * **GI:** Colicky pain, vomiting, or GI bleeding (due to bowel wall edema). [1] * **Joints:** Migratory arthralgia/arthritis. * **Renal:** IgA nephropathy (hematuria). **2. Why Other Options are Incorrect:** * **Kawasaki Disease:** A medium-vessel vasculitis in children characterized by high fever, conjunctivitis, strawberry tongue, and coronary artery aneurysms. [2] It does not present with IgA deposition or typical purpura. * **Wegener’s Granulomatosis (GPA):** A small-vessel vasculitis associated with **c-ANCA** and granulomatous inflammation of the respiratory tract and kidneys. It is rare in young children. * **Takayasu Disease:** A large-vessel vasculitis ("pulseless disease") affecting the aorta and its branches, typically seen in young females. **3. NEET-PG High-Yield Pearls:** * **Most common** systemic vasculitis in children. * **Biopsy Findings:** Leukocytoclastic vasculitis with IgA and C3 deposition on immunofluorescence. * **Platelet Count:** Normal (distinguishes it from ITP). * **Complication:** Intussusception (usually ileo-ileal) is a known surgical complication in these patients. * **Management:** Mostly supportive; steroids are used for severe GI or renal involvement.

Question 24: Cirrhosis can lead to the development of which acid-base disorder?

A. Metabolic alkalosis, chloride responsive
B. Metabolic alkalosis, chloride non-responsive (Correct Answer)
C. Hyperchloremic metabolic acidosis
D. Hypochloremic metabolic acidosis

Explanation: ### Explanation In patients with cirrhosis, the development of **Metabolic Alkalosis** is primarily driven by secondary hyperaldosteronism and the use of potent diuretics. **Why Option B is Correct:** The pathophysiology involves several factors: 1. **Secondary Hyperaldosteronism:** Decreased effective arterial blood volume (due to splanchnic vasodilation) activates the RAAS. Excess aldosterone promotes sodium reabsorption and increases **hydrogen (H+) and potassium (K+) secretion** in the distal tubule [1]. 2. **Hypokalemia:** Chronic diuretic use (e.g., Furosemide) and hyperaldosteronism lead to potassium depletion. This causes a transcellular shift (K+ moves out of cells, H+ moves in) and increases renal ammoniagenesis, further elevating bicarbonate levels [1]. 3. **Chloride Status:** Unlike vomiting-induced alkalosis, the alkalosis in cirrhosis is often **chloride-resistant (non-responsive)** because the underlying stimulus (hypoalbuminemia and decreased effective volume) persistently drives mineralocorticoid activity, and total body sodium/water are often elevated despite low effective volume [1]. **Why Other Options are Incorrect:** * **Option A:** Chloride-responsive alkalosis is typically seen in volume-depleted states like vomiting or nasogastric suction, where saline infusion corrects the deficit [1]. * **Option C & D:** While cirrhosis can occasionally present with Respiratory Alkalosis (due to hyperventilation) or Metabolic Acidosis (in Hepatorenal Syndrome) [2], Metabolic Alkalosis remains a classic association due to the diuretic-aldosterone axis. **NEET-PG High-Yield Pearls:** * **Most common acid-base disturbance in stable cirrhosis:** Respiratory Alkalosis (due to progesterone-mediated or ammonia-induced stimulation of the respiratory center). * **Metabolic Alkalosis** is a significant trigger for **Hepatic Encephalopathy** because alkalosis favors the conversion of ammonium ($NH_4^+$) to ammonia ($NH_3$), which easily crosses the blood-brain barrier. * **Management:** Spironolactone is the preferred diuretic as it antagonizes aldosterone and helps conserve potassium [1]. ### Available References (numbered 1 to 5)

Question 25: Which of the following is most commonly affected in Ulcerative Colitis?

A. Cecum
B. Rectum (Correct Answer)
C. Sigmoid colon
D. Terminal ileum

Explanation: **Explanation:** Ulcerative Colitis (UC) is a chronic inflammatory bowel disease characterized by diffuse, continuous mucosal inflammation. The hallmark of UC is its involvement of the **rectum**, which is affected in nearly **100% of cases** [1]. The disease typically originates in the rectum and extends proximally in a continuous fashion without "skip lesions" [1]. **Analysis of Options:** * **Rectum (Correct):** It is the most common site of involvement. When inflammation is limited to the rectum, it is termed *ulcerative proctitis* [1]. * **Cecum (Incorrect):** While the cecum can be involved in "pancolitis," it is rarely the primary or most common site. * **Sigmoid Colon (Incorrect):** The sigmoid is frequently involved as the disease spreads proximally from the rectum (proctosigmoiditis), but the rectum remains the definitive starting point. * **Terminal Ileum (Incorrect):** UC is primarily a disease of the colon. The terminal ileum is usually spared, though it may show "backwash ileitis" in cases of severe pancolitis. **High-Yield Clinical Pearls for NEET-PG:** * **Continuous Involvement:** Unlike Crohn’s, UC does not have skip lesions; it moves from the rectum upwards [1]. * **Smoking Paradox:** Smoking is actually **protective** in UC. * **Histology:** Look for **crypt abscesses** and mucosal/submucosal involvement [1]. * **Complications:** UC carries a higher risk of **Toxic Megacolon** and **Primary Sclerosing Cholangitis (PSC)** compared to Crohn’s.

Question 26: Transient erythroid hypoplasia in hereditary spherocytosis is caused by?

A. Epstein Barr virus
B. Parvovirus B19 (Correct Answer)
C. Cytomegalovirus
D. Hepatitis B virus

Explanation: **Explanation:** The correct answer is **Parvovirus B19**. **Mechanism of Action:** Parvovirus B19 is a DNA virus that specifically targets and destroys **erythroid progenitor cells** in the bone marrow by binding to the **P-antigen** (globoside) on their surface [1]. In healthy individuals, this causes a mild, transient drop in hemoglobin that is clinically insignificant. However, in patients with high red cell turnover (e.g., **Hereditary Spherocytosis**, Sickle Cell Anemia, or Thalassemia), the bone marrow is already working at maximum capacity to compensate for hemolysis [1]. When Parvovirus B19 halts erythropoiesis, it leads to a sudden, severe drop in hemoglobin and a low reticulocyte count, a condition known as an **Aplastic Crisis** [1]. **Analysis of Incorrect Options:** * **A. Epstein-Barr Virus (EBV):** Primarily causes Infectious Mononucleosis. While it can cause autoimmune hemolytic anemia (AIHA), it does not typically cause transient erythroid hypoplasia. * **C. Cytomegalovirus (CMV):** Generally causes asymptomatic infection or mononucleosis-like syndrome in immunocompetent hosts and multisystem organ disease in immunocompromised patients, but not specific erythroid hypoplasia. * **D. Hepatitis B Virus (HBV):** Associated with extrahepatic manifestations like Polyarteritis Nodosa (PAN) and Membranous Glomerulonephritis, but not acute aplastic crises in hemolytic anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark of Aplastic Crisis:** Anemia + **Reticulocytopenia** (distinguishes it from a hyperhemolytic crisis where reticulocytes are high) [1]. * **Fifth Disease:** In children, Parvovirus B19 causes **Erythema Infectiosum**, characterized by a "slapped-cheek" rash [1]. * **Hydrops Fetalis:** Parvovirus B19 infection in pregnancy can lead to severe fetal anemia and high-output heart failure. * **Diagnosis:** Detection of IgM antibodies or PCR for viral DNA.

Question 27: A mediastinoscope can visualize all of the following lymph nodes except?

A. Right paratracheal lymph node
B. Aortopulmonary window lymph node (Correct Answer)
C. Anterior tracheal lymph node
D. Subcarinal lymph node

Explanation: Explanation: Mediastinoscopy (specifically cervical mediastinoscopy) is a surgical procedure used to sample mediastinal lymph nodes for staging lung cancer or diagnosing granulomatous diseases. The procedure involves an incision above the suprasternal notch, following the pretracheal fascia into the mediastinum. Why Option B is correct: The **Aortopulmonary (AP) window lymph nodes (Station 5)** and **Anterior mediastinal nodes (Station 6)** are located lateral to the trachea and great vessels, hidden behind the aortic arch. They are **not accessible** via standard cervical mediastinoscopy because the aortic arch and the left main pulmonary artery block the path of the scope. To sample these nodes, a **Chamberlain procedure (Anterior Mediastinotomy)** or Video-assisted thoracoscopic surgery (VATS) is required. Why other options are incorrect: The mediastinoscope travels along the anterior and lateral surfaces of the trachea, allowing access to: * **Station 2 & 4 (Paratracheal nodes):** Both right and left paratracheal nodes are easily accessible as the scope passes alongside the trachea. * **Station 1 (Highest mediastinal/Anterior tracheal):** These are located superior to the brachiocephalic vein and are accessible during the initial descent. * **Station 7 (Subcarinal nodes):** By following the trachea down to the bifurcation, the scope can reach the subcarinal space (though only the anterior portion). High-Yield Clinical Pearls for NEET-PG: * **Gold Standard:** Mediastinoscopy is the gold standard for mediastinal lymph node staging. * **The "Dead End":** The scope cannot pass posterior to the trachea or esophagus. * **Station 5 & 6:** Always remember that Station 5 (AP window) and Station 6 (Para-aortic) require a **Chamberlain Procedure**. * **Most common complication:** Recurrent laryngeal nerve injury (more common on the left).

Question 28: Which of the following is true about Henoch-Schonlein Purpura?

A. Abdominal pain
B. Nephritis
C. Palpable purpura
D. All of the above (Correct Answer)

Explanation: **Explanation:** Henoch-Schönlein Purpura (HSP), now commonly referred to as **IgA Vasculitis**, is the most common systemic vasculitis in children. It is a small-vessel vasculitis characterized by the deposition of **IgA-dominant immune complexes** in the walls of capillaries, venules, and arterioles [1]. The diagnosis is primarily clinical, based on a classic tetrad of symptoms represented in the options: 1. **Palpable Purpura (Option C):** This is the hallmark of the disease, occurring in 100% of cases [1]. Unlike thrombocytopenic purpura, these lesions are raised (palpable) and typically distributed over gravity-dependent areas like the buttocks and lower extremities. 2. **Abdominal Pain (Option A):** Occurs in approximately 50–75% of patients due to submucosal hemorrhage and edema [1]. It can lead to complications like intussusception (typically ileo-ileal). 3. **Nephritis (Option B):** Known as HSP nephritis, it occurs in 20–50% of patients. It presents similarly to IgA Nephropathy (Berger’s disease) with hematuria or proteinuria. 4. **Arthralgia/Arthritis:** Usually involves large joints (knees and ankles) and is transient and non-deforming. **Why "All of the above" is correct:** Since HSP is a multisystem disorder, all three clinical features—cutaneous purpura, gastrointestinal involvement, and renal involvement—are core components of its clinical presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Trigger:** Often follows an Upper Respiratory Tract Infection (URTI) [1]. * **Platelet Count:** Characteristically **normal** (distinguishes it from ITP). * **Biopsy:** Shows **Leukocytoclastic vasculitis** with IgA and C3 deposition on immunofluorescence. * **Prognosis:** Generally excellent, but long-term prognosis depends entirely on the severity of **renal involvement**.

Question 29: Charcot's joint is most commonly seen in which of the following conditions?

A. Syringomyelia (Correct Answer)
B. Diabetes mellitus
C. Hydrocephalus
D. Arnold-chiari malformation

Explanation: **Explanation:** **Charcot’s Joint (Neuropathic Arthropathy)** is a progressive degenerative condition characterized by joint destruction, bone resorption, and eventual deformity due to a loss of pain and proprioceptive sensation [1]. **Why Syringomyelia is the Correct Answer:** While Diabetes Mellitus is the most common cause of Charcot’s joint in the **lower limbs** (specifically the foot and ankle), **Syringomyelia** is the classic and most common cause of Charcot’s joint in the **upper limbs** (specifically the **shoulder joint**, followed by the elbow). In the context of standard medical examinations like NEET-PG, when the question asks for the association without specifying the joint, Syringomyelia is frequently the tested "textbook" association for upper limb involvement due to the destruction of the spinothalamic tract [2]. **Analysis of Incorrect Options:** * **B. Diabetes Mellitus:** The most common cause of Charcot’s joint overall in modern clinical practice, but it primarily affects the **tarsal and metatarsal joints** (foot) [1]. * **C. Hydrocephalus:** This involves CSF accumulation in the brain ventricles and does not typically cause the localized sensory loss required to develop a neuropathic joint. * **D. Arnold-Chiari Malformation:** While Type I can be associated with Syringomyelia, the malformation itself does not directly cause Charcot’s joint; it is the resulting syrinx that leads to the pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** "6 Ds" of Charcot Joint (Radiology): Distention, Density (sclerosis), Debris, Disorganization, Dislocation, and Destruction. * **Tabes Dorsalis (Syphilis):** Historically the most common cause; typically affects the **Knee joint**. * **Pain Paradox:** Despite the horrific radiographic appearance of joint destruction, the patient often experiences surprisingly little pain due to the underlying neuropathy. * **Location Summary:** * **Shoulder:** Syringomyelia * **Foot:** Diabetes Mellitus [1] * **Knee:** Tabes Dorsalis (Neurosyphilis)

Question 30: In psoriatic arthritis with liver fibrosis, which of the following medications cannot be used for treatment?

A. Methotrexate (Correct Answer)
B. Anti-TNF-alpha agents
C. Steroids
D. Sulfasalazine

Explanation: **Explanation:** The correct answer is **Methotrexate (Option A)**. **1. Why Methotrexate is the correct answer:** Methotrexate (MTX) is a folic acid antagonist and a mainstay in the treatment of Psoriatic Arthritis (PsA) [1]. However, its primary dose-limiting toxicity is **hepatotoxicity** [1]. Chronic administration can lead to elevated liver enzymes, steatosis, and significantly, **liver fibrosis or cirrhosis** [2]. In a patient who already has established liver fibrosis, MTX is strictly contraindicated as it would exacerbate the underlying pathology and potentially lead to liver failure. **2. Why the other options are incorrect:** * **Anti-TNF-alpha agents (Option B):** Drugs like Etanercept or Adalimumab are highly effective in PsA. While they require screening for latent TB and Hepatitis B, they are not directly hepatotoxic and are often the preferred alternative when MTX is contraindicated due to liver disease. * **Steroids (Option C):** While used sparingly in PsA due to the risk of triggering erythrodermic or pustular psoriasis flare-ups upon withdrawal, they do not cause liver fibrosis and are not contraindicated by liver disease. * **Sulfasalazine (Option D):** This is a DMARD used for peripheral joint involvement in PsA [1]. It is generally considered safe in the context of liver fibrosis, though routine monitoring is still advised. **Clinical Pearls for NEET-PG:** * **Monitoring:** Patients on long-term MTX should be monitored with liver function tests (LFTs) [2]. The **FibroScan** or **PIIINP (Procollagen III Amino-terminal Peptide)** levels are modern non-invasive ways to monitor MTX-induced fibrosis. * **Leflunomide:** Another DMARD used in PsA that is also hepatotoxic and should be avoided in liver disease. * **Drug of Choice:** For PsA with skin involvement, MTX is often first-line; however, if liver disease is present, **Secukinumab (IL-17 inhibitor)** or **TNF-inhibitors** are safer systemic choices.

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