Addiction Medicine Practice Questions

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

Calcium pyrophosphate. **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.

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

Irritable bowel syndrome. 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].

Q: 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?

Henoch-Schonlein Purpura. **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.

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

Rectum. **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.

Q: Transient erythroid hypoplasia in hereditary spherocytosis is caused by?

Parvovirus B19. **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.

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

Aortopulmonary window lymph node. 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).

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

All of the above. **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**.

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

Methotrexate. **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.

Question 1

Which of the following pathological agents is implicated in pseudogout?

Accepted Answer

Calcium pyrophosphate

Answer

Sodium monourate

Answer

Calcium oxalate

Answer

Sodium pyrophosphate

Question 2

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

Accepted Answer

Irritable bowel syndrome

Answer

Inflammatory bowel disease

Answer

Gastrointestinal tumours

Answer

Neuroendocrine tumours

Question 3

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?

Accepted Answer

Henoch-Schonlein Purpura

Answer

Kawasaki Disease

Answer

Wegener's Granulomatosis

Answer

Takayasu Disease

Question 4

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

Accepted Answer

Metabolic alkalosis, chloride non-responsive

Answer

Metabolic alkalosis, chloride responsive

Answer

Hyperchloremic metabolic acidosis

Answer

Hypochloremic metabolic acidosis

Question 5

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

Accepted Answer

Rectum

Answer

Cecum

Answer

Sigmoid colon

Answer

Terminal ileum

Question 6

Transient erythroid hypoplasia in hereditary spherocytosis is caused by?

Accepted Answer

Parvovirus B19

Answer

Epstein Barr virus

Answer

Cytomegalovirus

Answer

Hepatitis B virus

Question 7

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

Accepted Answer

Aortopulmonary window lymph node

Answer

Right paratracheal lymph node

Answer

Anterior tracheal lymph node

Answer

Subcarinal lymph node

Question 8

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

Accepted Answer

All of the above

Answer

Abdominal pain

Answer

Nephritis

Answer

Palpable purpura

Question 9

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

Accepted Answer

Syringomyelia

Answer

Diabetes mellitus

Answer

Hydrocephalus

Answer

Arnold-chiari malformation

Question 10

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

Accepted Answer

Methotrexate

Answer

Anti-TNF-alpha agents

Answer

Steroids

Answer

Sulfasalazine

Addiction Medicine — MCQs

Addiction Medicine — MCQs

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