Addiction Medicine Practice Questions

Q: In a patient with chronic congestive cardiac failure, which of the following drugs does NOT prolong survival?

Digoxin. In Chronic Congestive Cardiac Failure (CCF) with reduced ejection fraction (HFrEF), the primary goal of therapy is to block the maladaptive neurohormonal activation (Renin-Angiotensin-Aldosterone System and Sympathetic Nervous System) that leads to cardiac remodeling and disease progression. **Why Digoxin is the correct answer:** Digoxin is a positive inotrope that acts by inhibiting the **Na+/K+-ATPase pump**, increasing intracellular calcium. While it improves symptoms, increases exercise tolerance, and reduces the rate of hospitalizations (as shown in the **DIG Trial**), it has **no effect on overall mortality** [1]. It is primarily used for rate control in patients with concomitant Atrial Fibrillation or for symptomatic relief in refractory heart failure [1]. **Why the other options are incorrect:** * **Enalapril (ACE Inhibitor):** ACE inhibitors are the cornerstone of CCF therapy. They prevent the formation of Angiotensin II, reducing afterload and cardiac remodeling, thereby significantly improving survival [1]. * **Metoprolol (Succinate) & Carvedilol (Beta-blockers):** These drugs counteract the toxic effects of chronic catecholamine exposure. Large trials (e.g., MERIT-HF for Metoprolol, COPERNICUS for Carvedilol) have proven they reduce mortality in stable CCF patients [1]. *Note: Only Metoprolol Succinate (long-acting), not Tartrate, is proven for survival.* **High-Yield Clinical Pearls for NEET-PG:** * **Drugs that improve survival in HFrEF:** ACE inhibitors/ARBs, Beta-blockers (Carvedilol, Metoprolol succinate, Bisoprolol), Aldosterone antagonists (Spironolactone), ARNI (Sacubitril/Valsartan), and SGLT2 inhibitors (Dapagliflozin) [1]. * **Drugs that only improve symptoms (No mortality benefit):** Digoxin, Loop diuretics (Furosemide) [1]. * **Digoxin Toxicity:** Characterized by gastrointestinal upset and visual disturbances (Xanthopsia/yellow vision). Hypokalemia predisposes to toxicity.

Q: Which of the following is NOT seen in an upper motor neuron lesion?

Exaggerated superficial reflexes. In an **Upper Motor Neuron (UMN) lesion**, the inhibitory control from the motor cortex and descending tracts (like the corticospinal tract) is lost. This leads to a state of "disinhibition" of the spinal cord arcs [1]. ### Why Option B is the Correct Answer In UMN lesions, **superficial reflexes are lost or diminished**, not exaggerated. Common examples include the abdominal reflex and the cremasteric reflex. These reflexes require an intact cortical arc; when the UMN pathway is damaged, this arc is interrupted, leading to their disappearance. This is a classic "trap" in exams, as most other signs in UMN lesions involve "increased" activity. ### Explanation of Incorrect Options * **A. Hypertonic muscles:** Loss of descending inhibition leads to increased muscle tone [3], specifically **spasticity** (clasp-knife variety). * **C. Exaggerated deep reflexes:** The muscle stretch reflex (monosynaptic arc) becomes hyperactive because the higher centers no longer dampen the response, resulting in **brisk tendon jerks** and clonus [2]. * **D. Positive Babinski sign:** This is the hallmark of a UMN lesion. The normal plantar response (flexion) is replaced by an **extensor plantar response** (upgoing big toe), representing a primitive withdrawal pattern that is normally suppressed by the UMN. ### High-Yield Clinical Pearls for NEET-PG * **UMN vs. LMN:** Remember that UMN is "Everything UP" (Tone ↑, Reflexes ↑, Upgoing toes), while LMN is "Everything LOWERED" (Tone ↓, Reflexes ↓, Atrophy, Fasciculations). * **The Exception:** Superficial reflexes are the only reflexes that go **DOWN** in a UMN lesion. * **Pronator Drift:** A sensitive physical exam finding for subtle UMN weakness. * **Spasticity vs. Rigidity:** Spasticity (UMN) is velocity-dependent; Rigidity (Extrapyramidal/Parkinson’s) is independent of velocity [3].

Q: The deficiency of coagulation factor IX is associated with which of the following conditions?

Haemophilia B. **Explanation:** The correct answer is **Haemophilia B**. This condition, also known as **Christmas Disease**, is an X-linked recessive bleeding disorder caused by a deficiency of functional **Coagulation Factor IX** [1]. Factor IX is a crucial component of the intrinsic pathway of the coagulation cascade; its deficiency leads to defective secondary hemostasis, resulting in deep tissue bleeds and hemarthrosis [2]. **Analysis of Options:** * **Haemophilia A:** This is the most common type of haemophilia but is caused by a deficiency of **Factor VIII** [2]. Like Haemophilia B, it is X-linked recessive and clinically indistinguishable without a factor assay. * **Henoch-Schönlein purpura (HSP):** This is an IgA-mediated small-vessel vasculitis. It presents with a classic tetrad of palpable purpura, arthralgia, abdominal pain, and renal disease. It is not a factor deficiency disorder. * **Sickle cell anaemia:** This is an autosomal recessive hemoglobinopathy caused by a point mutation in the β-globin gene (glutamic acid replaced by valine). It involves structural defects in RBCs, not coagulation factor deficiencies. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Both Haemophilia A and B are **X-linked recessive** (mostly affecting males) [1]. * **Lab Findings:** Characterized by a **prolonged aPTT** (activated Partial Thromboplastin Time) with a **normal PT** (Prothrombin Time) and normal bleeding time. * **Mixing Study:** The prolonged aPTT will **correct** when the patient's plasma is mixed with normal plasma (distinguishing it from factor inhibitors). * **Management:** Treatment involves factor replacement therapy. For Haemophilia B, recombinant Factor IX is used [1]. Fresh Frozen Plasma (FFP) or Prothrombin Complex Concentrate (PCC) can be used if specific factors are unavailable.

Q: Wilson's disease is best diagnosed by?

Increased urinary copper excretion. 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** ( 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).

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.

Question 1

In a patient with chronic congestive cardiac failure, which of the following drugs does NOT prolong survival?

Accepted Answer

Digoxin

Answer

Metoprolol

Answer

Carvedilol

Answer

Enalapril

Question 2

Which of the following is NOT seen in an upper motor neuron lesion?

Accepted Answer

Exaggerated superficial reflexes

Answer

Hypertonic muscles

Answer

Exaggerated deep reflexes

Answer

Positive Babinski sign

Question 3

The deficiency of coagulation factor IX is associated with which of the following conditions?

Accepted Answer

Haemophilia B

Answer

Haemophilia A

Answer

Henoch-Schönlein purpura

Answer

Sickle cell anaemia

Question 4

Wilson's disease is best diagnosed by?

Accepted Answer

Increased urinary copper excretion

Answer

Increased serum ceruloplasmin

Answer

Decreased liver copper

Answer

Absence of Kayser-Fleischer rings

Question 5

Which of the following pathological agents is implicated in pseudogout?

Accepted Answer

Calcium pyrophosphate

Answer

Sodium monourate

Answer

Calcium oxalate

Answer

Sodium pyrophosphate

Addiction Medicine — MCQs

Addiction Medicine — MCQs

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