Gastroenterology Practice Questions

Q: Which of the following statements is FALSE regarding Wilson's disease?

It is an autosomal dominant disorder.. ### Explanation **1. Why Option A is the Correct (False) Statement:** Wilson’s disease is an **autosomal recessive** disorder, not autosomal dominant. It is caused by mutations in the **ATP7B gene** on chromosome 13, which encodes a copper-transporting P-type ATPase. This defect leads to impaired biliary excretion of copper and failure to incorporate copper into ceruloplasmin, resulting in toxic copper accumulation in the liver, brain (basal ganglia), and cornea. **2. Analysis of Other Options:** * **Option B (Hemolytic Anemia):** This is a known manifestation. Sudden release of free copper into the bloodstream from necrotic hepatocytes can cause oxidative damage to RBC membranes, leading to **Coombs-negative hemolytic anemia**, often accompanying acute liver failure. * **Option C (Low Ceruloplasmin):** This is a classic diagnostic marker. In Wilson’s disease, the lack of copper incorporation into apoceruloplasmin makes the molecule unstable, leading to its rapid degradation and low serum levels (<20 mg/dL). * **Option D (Zinc Acetate):** Zinc is a standard maintenance therapy. It induces **metallothionein** in intestinal mucosal cells, which acts as an intracellular chelator, trapping copper and preventing its absorption into the portal circulation. **3. NEET-PG High-Yield Pearls:** * **Kayser-Fleischer (KF) Rings:** Copper deposition in the **Descemet’s membrane** of the cornea (best seen on slit-lamp exam). * **Neurological Signs:** "Wing-beating" tremors, dysarthria, and Parkinsonian features due to basal ganglia involvement. * **Diagnosis:** Best initial screening is serum ceruloplasmin; the **Gold Standard** is a liver biopsy (increased hepatic copper). * **Treatment:** Penicillamine or Trientine (chelators) for initial therapy; Zinc for maintenance/asymptomatic patients.

Q: Which of the following is not a feature of autoimmune hepatitis?

Anti-Sm antigen antibodies. The correct answer is **D. Anti-Sm (Smith) antigen antibodies**. **Why Anti-Sm is the correct choice:** Anti-Sm antibodies are highly specific for **Systemic Lupus Erythematosus (SLE)**, not autoimmune hepatitis (AIH) [1]. While AIH is an autoimmune condition, its diagnosis relies on specific liver-related autoantibodies. Anti-Sm is part of the ENA (Extractable Nuclear Antigen) panel used to confirm a diagnosis of SLE [1]. **Analysis of incorrect options:** * **A. Anti-SMA (Smooth Muscle Antibodies):** These are the hallmark of **Type 1 AIH** (the most common form). They are often found alongside positive ANA (Anti-Nuclear Antibodies) [1]. * **B. Anti-LKM1 (Liver Kidney Microsome type 1):** These antibodies are the serological marker for **Type 2 AIH**, which typically affects children and adolescents and follows a more aggressive course. * **C. Anti-mitochondrial antibodies (AMA):** While AMA is the classic marker for Primary Biliary Cholangitis (PBC), it can be present in **"Overlap Syndrome,"** where a patient exhibits features of both AIH and PBC. Therefore, it is considered a recognized feature in the spectrum of autoimmune liver diseases. **NEET-PG High-Yield Pearls:** * **AIH Type 1:** ANA (+), Anti-SMA (+), associated with HLA-DR3/DR4 [1]. * **AIH Type 2:** Anti-LKM1 (+), Anti-LC1 (Liver Cytosol type 1) (+). * **Histology:** Look for **"Interface Hepatitis"** (piecemeal necrosis) and a dense infiltrate of **plasma cells**. * **Treatment:** Prednisolone (Corticosteroids) and Azathioprine are the mainstays of therapy.

Q: A 40-year-old woman complains of severe back pain for about 3 months and recurrent fever. Her past medical history is significant for ulcerative colitis. On physical examination, the patient is thin and jaundiced. The liver edge descends 1 cm below the right costal margin and is nontender. Laboratory studies show normal serum levels of AST and ALT but elevated serum levels of alkaline phosphatase (420 U/L). Endoscopic retrograde cholangiopancreatography demonstrates a beaded appearance of the extrahepatic biliary tree. Which of the following diseases is a late complication of this patient's condition?

Cholangiocarcinoma. The clinical presentation points toward **Primary Sclerosing Cholangitis (PSC)**. The key diagnostic features in this case are the patient’s history of **Ulcerative Colitis (UC)**, elevated alkaline phosphatase (suggesting cholestasis), and the classic **"beaded appearance"** (multifocal strictures and dilations) of the biliary tree on ERCP [1]. **1. Why Cholangiocarcinoma is correct:** PSC is a chronic, progressive inflammatory disorder of the bile ducts. It is the most significant risk factor for **Cholangiocarcinoma**, which develops in approximately 10–15% of patients with PSC [2]. The chronic inflammation and cellular dysplasia within the biliary epithelium predispose patients to this malignancy, often occurring years after the initial diagnosis. **2. Why the other options are incorrect:** * **A. Adenocarcinoma of the gallbladder:** While PSC increases the risk of gallbladder polyps and stones, the association with cholangiocarcinoma is much stronger and more characteristic for NEET-PG scenarios [2]. * **C. Hepatic adenoma:** This is primarily associated with oral contraceptive use or anabolic steroids, not chronic biliary inflammation. * **D. Hepatic angiosarcoma:** This rare tumor is linked to environmental toxins like vinyl chloride, arsenic, or Thorotrast, rather than autoimmune or inflammatory bowel conditions. **Clinical Pearls for NEET-PG:** * **The "Rule of 70% ":** Approximately 70-80% of patients with PSC have underlying Ulcerative Colitis (though only 4-5% of UC patients develop PSC) [1]. * **Antibody Marker:** **p-ANCA** is positive in about 60-80% of PSC cases [1]. * **Imaging Gold Standard:** MRCP is now the initial diagnostic test of choice, showing the "beaded" pattern [1]. * **Management:** PSC does not improve with a colectomy (unlike other extraintestinal manifestations of UC). Liver transplantation is the only definitive treatment for end-stage disease.

Q: Which of the following is NOT a common cause of oesophagitis in an immunocompromised person?

Human Immunodeficiency Virus (HIV). In immunocompromised patients (such as those with AIDS, organ transplants, or malignancy), infectious oesophagitis is a frequent complication. The correct answer is **HIV (Option B)** because, while HIV is the underlying cause of the immunosuppression that predisposes a patient to infections, the virus itself is **not a common direct cause** of oesophagitis. While "HIV-associated idiopathic esophageal ulcers" can occur during seroconversion, they are significantly less common than opportunistic infections. **Analysis of Options:** * **HSV (Option A):** A very common cause. It typically presents with small, punched-out "volcano-like" ulcers. Histology shows Cowdry Type A inclusion bodies and multinucleated giant cells. * **CMV (Option D):** Another frequent cause in severely immunocompromised patients (CD4 <50). It typically presents with large, linear, shallow ulcers. Histology reveals characteristic "owl’s eye" intranuclear inclusions. * **VZV (Option C):** Though less common than HSV or CMV, VZV is a recognized cause of viral oesophagitis in the immunocompromised, often occurring in association with disseminated zoster or chickenpox. **NEET-PG High-Yield Pearls:** 1. **Most Common Cause:** *Candida albicans* is the #1 overall cause of infectious oesophagitis (presents with white plaques) [1]. 2. **Endoscopic Differentiation:** * **HSV:** Multiple, small, deep ulcers (Volcano ulcers). * **CMV:** Large, solitary, shallow/linear ulcers. 3. **Drug of Choice:** Fluconazole for *Candida*, Acyclovir for HSV, and Ganciclovir for CMV. 4. **Odynophagia:** Severe pain on swallowing is the hallmark symptom of viral oesophagitis, often more prominent than dysphagia.

Q: Which substance is most often incriminated in the pathogenesis of hepatic encephalopathy?

Ammonia. **Explanation:** **Pathogenesis of Hepatic Encephalopathy (HE):** The correct answer is **Ammonia (NH₃)** [1]. In a healthy individual, ammonia is produced by the breakdown of proteins by intestinal bacteria and the metabolism of amino acids [2]. It is then transported via the portal vein to the liver, where it is converted into urea via the **Urea Cycle**. In patients with cirrhosis or portosystemic shunting, the liver fails to detoxify ammonia [1]. Elevated systemic ammonia crosses the **blood-brain barrier**, where it is taken up by **astrocytes**. Here, ammonia is converted into **glutamine** by the enzyme glutamine synthetase. The osmotic effect of excess glutamine leads to astrocyte swelling and cerebral edema, which are central to the pathogenesis of HE [2]. **Analysis of Incorrect Options:** * **A. Urea:** Urea is the non-toxic end product of ammonia metabolism [2]. While urea levels may be low in end-stage liver disease, it does not cause neurotoxicity. * **C. Uric Acid:** This is the end product of purine metabolism. Elevated levels cause gout or urate nephropathy, not encephalopathy. * **D. Creatinine:** This is a marker of renal function (muscle metabolism byproduct). While it rises in Hepatorenal Syndrome [3], it is not the causative agent of HE. **NEET-PG High-Yield Pearls:** * **Astrocyte Swelling:** The hallmark pathological change in HE. * **Alzheimer Type II Astrocytes:** Characteristically seen on brain histopathology in chronic HE. * **Precipitating Factors:** GI bleed (increases protein load), infections (SBP), hypokalemia, and constipation. * **Treatment Gold Standard:** **Lactulose** (converts NH₃ to non-absorbable NH₄⁺) and **Rifaximin** (reduces ammonia-producing gut flora).

Q: Which of the following statements regarding capsule endoscopy is false?

It is suitable for patients with bowel strictures.. The correct answer is **D**. Capsule endoscopy is **contraindicated** in patients with known or suspected bowel strictures, obstructions, or extensive Crohn’s disease with narrowing. This is because the non-dissolvable capsule (roughly the size of a large vitamin pill) can become trapped at the site of the stricture, leading to **capsule retention**, which may necessitate surgical or endoscopic retrieval. **Analysis of Options:** * **A & B:** These are true. Capsule endoscopy is non-invasive. The patient swallows the device with water; it requires **no sedation** and is **painless**, as it moves naturally through the GI tract via peristalsis [1]. * **C:** This is true. One of the primary clinical advantages of capsule endoscopy is its ability to visualize the **entire small bowel** (duodenum, jejunum, and ileum), areas that are often beyond the reach of conventional upper GI endoscopy and colonoscopy [1]. **Clinical Pearls for NEET-PG:** * **Primary Indication:** Obscure Gastrointestinal Bleeding (OGIB) is the most common indication. * **Gold Standard:** It is the gold standard for diagnosing mucosal lesions in the small intestine (e.g., Angiodysplasia, early Crohn’s). * **Patency Capsule:** If a stricture is suspected, a "Patency Capsule" (a dissolvable dummy capsule) is administered first. If it passes intact, the procedure is safe. * **Contraindications:** Besides strictures, other contraindications include pregnancy and implanted electromedical devices like pacemakers (though the latter is now considered a relative contraindication).

Question 1

Which of the following statements is FALSE regarding Wilson's disease?

Accepted Answer

It is an autosomal dominant disorder.

Answer

Hemolytic anemia can be a manifestation.

Answer

Low serum ceruloplasmin levels are observed.

Answer

Zinc acetate is effective for maintenance therapy.

Question 2

A 29-year-old man with acquired immune deficiency syndrome (AIDS) presents with progressively increasing abdominal discomfort and voluntary guarding in the upper abdomen. His biochemistry is normal except for an elevated amylase at 370 U/L (25-125 U/L). Which of the following infections can trigger this disorder in AIDS patients?

Accepted Answer

Mycobacterium avium complex

Answer

Toxoplasmosis

Answer

Mycobacterium tuberculosis

Answer

Pneumocystis jirovecii pneumonia

Question 3

Which of the following is not a feature of autoimmune hepatitis?

Accepted Answer

Anti-Sm antigen antibodies

Answer

Anti-SMA antibodies

Answer

Anti-LKM1 antibodies

Answer

Anti-mitochondrial antibodies

Question 4

In celiac sprue, which vitamin deficiency is least likely?

Accepted Answer

Vitamin B12

Answer

Vitamin A

Answer

Folic acid

Answer

Iron

Question 5

A 40-year-old woman complains of severe back pain for about 3 months and recurrent fever. Her past medical history is significant for ulcerative colitis. On physical examination, the patient is thin and jaundiced. The liver edge descends 1 cm below the right costal margin and is nontender. Laboratory studies show normal serum levels of AST and ALT but elevated serum levels of alkaline phosphatase (420 U/L). Endoscopic retrograde cholangiopancreatography demonstrates a beaded appearance of the extrahepatic biliary tree. Which of the following diseases is a late complication of this patient's condition?

Accepted Answer

Cholangiocarcinoma

Answer

Adenocarcinoma of the gallbladder

Answer

Hepatic adenoma

Answer

Hepatic angiosarcoma

Question 6

A 40-year-old patient, a known case of cirrhosis, develops an acute episode of gastrointestinal bleed. Initial therapy was given for 6 hours. Which of the following procedures is most useful?

Accepted Answer

Urgent endoscopy

Answer

Nasogastric aspiration

Answer

Sedation

Answer

Ultrasound

Question 7

Which of the following is NOT a common cause of oesophagitis in an immunocompromised person?

Accepted Answer

Human Immunodeficiency Virus (HIV)

Answer

Herpes Simplex Virus (HSV)

Answer

Varicella-Zoster Virus (VZV)

Answer

Cytomegalovirus (CMV)

Question 8

King's College criteria for orthotopic liver transplantation in acute liver failure (paracetamol induced) include all of the following except?

Accepted Answer

pH < 7.30

Answer

PT > 100s

Answer

Grade III encephalopathy

Answer

Serum bilirubin > 300 micromol/L

Question 9

Which substance is most often incriminated in the pathogenesis of hepatic encephalopathy?

Accepted Answer

Ammonia

Answer

Urea

Answer

Uric acid

Answer

Creatinine

Question 10

Which of the following statements regarding capsule endoscopy is false?

Accepted Answer

It is suitable for patients with bowel strictures.

Answer

Sedation is not required.

Answer

It is a painless procedure.

Answer

It can visualize the entire small bowel.

Gastroenterology — MCQs

Gastroenterology — MCQs

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