Gastroenterology Practice Questions

Q: Which of the following drugs is used for the treatment of steroid-resistant Crohn's disease?

Infliximab. **Explanation:** **Infliximab** is a chimeric monoclonal antibody that binds to and neutralizes **Tumor Necrosis Factor-alpha (TNF-α)**, a key pro-inflammatory cytokine involved in the pathogenesis of Inflammatory Bowel Disease (IBD). In clinical practice, Infliximab is the drug of choice for patients with **moderate-to-severe Crohn’s disease** who have an inadequate response to conventional therapy (corticosteroids or immunosuppressants) or those with **fistulizing Crohn’s disease**. **Analysis of Options:** * **Leflunomide (Option A):** This is a pyrimidine synthesis inhibitor (DHODH inhibitor) primarily used in the treatment of Rheumatoid Arthritis. It is not a standard treatment for Crohn’s disease. * **Mesalamine (Option B):** A 5-Aminosalicylic acid (5-ASA) derivative. While it is a first-line agent for inducing and maintaining remission in mild-to-moderate **Ulcerative Colitis**, it has limited efficacy in Crohn’s disease and is certainly not effective for steroid-resistant cases. **High-Yield NEET-PG Pearls:** 1. **TNF-α Inhibitors:** Other agents used in Crohn’s include Adalimumab and Certolizumab. 2. **Anti-Integrin Therapy:** **Vedolizumab** is used for patients who fail TNF-α inhibitors; it is gut-selective (binds to α4β7 integrin). 3. **IL-12/23 Inhibitor:** **Ustekinumab** is another biological option for refractory Crohn’s. 4. **Pre-requisite:** Before starting Infliximab, always screen for **Latent Tuberculosis** (PPD/IGRA) and Hepatitis B, as TNF inhibitors can cause reactivation. 5. **Side Effect:** Infliximab can lead to the development of "Antidrug Antibodies" (ADAs), which may reduce its efficacy over time.

Q: Which of the following anemias is a risk factor for the development of gastric carcinoma?

Pernicious anaemia. Explanation: Pernicious Anemia (Option A) is the correct answer because it is an autoimmune condition characterized by the destruction of gastric parietal cells [1]. This leads to Type A Chronic Atrophic Gastritis, primarily affecting the fundus and body of the stomach [1]. The resulting chronic inflammation and achlorhydria (lack of acid) trigger compensatory hypergastrinemia. Over time, the gastric mucosa undergoes intestinal metaplasia, which is a well-established precancerous lesion. Patients with pernicious anemia have a 3- to 6-fold increased risk of developing Gastric Adenocarcinoma and are also at risk for Gastric Carcinoid tumors (Neuroendocrine tumors) [2]. Incorrect Options: * Megaloblastic Anemia (Option B): This is a broad morphological category caused by Vitamin B12 or Folate deficiency [3]. While pernicious anemia is a *cause* of megaloblastic anemia, not all megaloblastic anemias (e.g., those due to dietary deficiency or folate malabsorption) involve the gastric pathology required to increase cancer risk. * Aplastic Anemia (Option C): This is a bone marrow failure syndrome. It does not involve the gastric mucosa and has no association with gastric malignancy. * Haemolytic Anemia (Option D): This involves the premature destruction of red blood cells. It is associated with complications like gallstones (pigment stones) but not with gastric carcinoma. NEET-PG High-Yield Pearls: * Type A Gastritis: Autoimmune, involves Antibodies (Anti-parietal/Anti-IF), affects the Anatomical fundus, and leads to Achlorhydria [1]. * Type B Gastritis: Caused by Bacteria (H. pylori), affects the Basilar part (Antrum), and is the most common cause of gastric cancer worldwide [2]. * Screening: Patients with pernicious anemia do not require routine endoscopic screening unless they develop new gastrointestinal symptoms.

Q: A serum-ascitic albumin gradient less than 1.1 g/dL can be due to all the following except?

Nephrotic syndrome. The **Serum-Ascites Albumin Gradient (SAAG)** is the most reliable tool for classifying ascites, replacing the older "transudate vs. exudate" terminology [1]. It is calculated as: *SAAG = (Serum Albumin) – (Ascitic Fluid Albumin)* ### **1. Why Nephrotic Syndrome is the Correct Answer** A **SAAG < 1.1 g/dL** indicates **Non-Portal Hypertension**. In Nephrotic Syndrome, there is a profound loss of albumin in the urine, leading to severe hypoalbuminemia. Because the serum albumin levels are extremely low, the gradient between the serum and the ascitic fluid remains narrow (< 1.1 g/dL). Other causes of low SAAG include peritoneal carcinomatosis, tuberculosis, and pancreatitis [1]. ### **2. Why the Other Options are Incorrect** A **SAAG ≥ 1.1 g/dL** indicates **Portal Hypertension**. This occurs because high hydrostatic pressure in the portal system "pushes" water into the peritoneal cavity while leaving albumin behind in the vessels. * **Cirrhosis (Option A):** The classic cause of sinusoidal portal hypertension (High SAAG) [1]. * **Budd-Chiari Syndrome (Option B):** Post-sinusoidal obstruction leads to high portal pressures (High SAAG). * **Congestive Cardiac Failure (Option C):** Increased systemic venous pressure is transmitted to the portal system (High SAAG) [1]. *Note: CCF typically has a high SAAG but also a high total protein (>2.5 g/dL) in the ascitic fluid.* ### **High-Yield Clinical Pearls for NEET-PG** * **SAAG ≥ 1.1:** Portal Hypertension (Cirrhosis, Alcoholic hepatitis, Cardiac failure, Budd-Chiari, Portal vein thrombosis) [1]. * **SAAG 2.5 g/dL** because the liver sinusoids are healthy and allow protein leakage [1].

Q: A patient with a bleeding duodenal ulcer is managed conservatively. Which of the following treatment regimens is most likely to be successful?

Proton pump inhibitor (PPI) + Amoxicillin + Clarithromycin. **Explanation:** The primary goal in managing a duodenal ulcer (DU) is the eradication of *Helicobacter pylori*, which is responsible for over 90% of DU cases. Eradication significantly reduces the risk of ulcer recurrence and complications like re-bleeding. **Why Option B is Correct:** The standard first-line treatment for *H. pylori* is **Triple Therapy**, consisting of a **Proton Pump Inhibitor (PPI)** plus two antibiotics: **Amoxicillin** and **Clarithromycin**. * **PPI:** Increases gastric pH, which enhances the stability and efficacy of the antibiotics. * **Amoxicillin & Clarithromycin:** Provide synergistic bactericidal action against *H. pylori*. This regimen is preferred due to its high efficacy and relatively low side-effect profile compared to bismuth-based therapies. **Analysis of Incorrect Options:** * **Option A:** This is **Bismuth-based Quadruple Therapy**. While highly effective, it is typically reserved as a second-line treatment or used in areas with high clarithromycin resistance. * **Option C:** This is an incomplete regimen. Bismuth is rarely used with only one antibiotic (Clarithromycin) without a second antibiotic like Metronidazole or Tetracycline. * **Option D:** Dual therapy (PPI + one antibiotic) is insufficient for eradication and leads to high rates of antibiotic resistance and treatment failure. **High-Yield NEET-PG Pearls:** * **Duration:** Triple therapy is typically administered for **10–14 days**. * **Penicillin Allergy:** If the patient is allergic to penicillin, Amoxicillin is replaced with **Metronidazole**. * **Sequential Therapy:** Involves 5 days of PPI + Amoxicillin, followed by 5 days of PPI + Clarithromycin + Tinidazole. * **Urease Breath Test:** The gold standard non-invasive test to confirm eradication (performed 4 weeks after completing therapy).

Q: Which of the following is NOT a feature of Zollinger-Ellison syndrome?

Large gastric ulcer. Explanation: Zollinger-Ellison Syndrome (ZES) is caused by a gastrin-secreting tumor (gastrinoma), leading to profound gastric acid hypersecretion [3]. Why "Large gastric ulcer" is the correct answer: In ZES, ulcers typically occur in the duodenum (over 75% of cases), often in atypical locations like the distal duodenum or jejunum. While ulcers in ZES are often multiple or refractory, they are predominantly duodenal, not gastric [1]. Gastric ulcers are less common because the gastric mucosa is relatively more resistant to the high acid levels compared to the small intestine. Analysis of incorrect options: * Diarrhea non-responsive to fasting: This is a classic feature. The massive acid load enters the small bowel, inactivating pancreatic enzymes and malabsorbing fat. Since the diarrhea is driven by hormonal (gastrin) hypersecretion rather than oral intake, it persists during fasting (secretory diarrhea). * Epigastric pain: This is the most common presenting symptom (75-90% of patients) due to peptic ulcer disease. * Secretin study: This is the investigation of choice (most sensitive and specific provocative test). In ZES, intravenous secretin paradoxically increases serum gastrin levels (>200 pg/mL), whereas it inhibits gastrin in normal individuals. Clinical Pearls for NEET-PG: * Location: Most gastrinomas are found in the "Gastrinoma Triangle" (confluence of cystic/common bile duct, junction of 2nd/3rd parts of duodenum, and neck/body of pancreas). * Association: 25% of cases are associated with MEN-1 syndrome (3Ps: Parathyroid, Pancreas, Pituitary) [2]. * Diagnosis: Initial screening is by Fasting Serum Gastrin (>1000 pg/mL is diagnostic). If borderline, perform the Secretin Stimulation Test. * Treatment: High-dose PPIs are the mainstay for symptom control; surgical resection is required for localized tumors.

Question 1

Which of the following drugs is used for the treatment of steroid-resistant Crohn's disease?

Accepted Answer

Infliximab

Answer

Leflunomide

Answer

Mesalamine

Answer

None of the above

Question 2

Which of the following anemias is a risk factor for the development of gastric carcinoma?

Accepted Answer

Pernicious anaemia

Answer

Megaloblastic anaemia

Answer

Aplastic anaemia

Answer

Haemolytic anaemia

Question 3

Which of the following statements regarding primary sclerosing cholangitis is true?

Accepted Answer

Associated with inflammatory bowel disease

Answer

More common in males

Answer

Involves both intrahepatic and extrahepatic ducts

Answer

ERCP is a diagnostic tool

Question 4

A serum-ascitic albumin gradient less than 1.1 g/dL can be due to all the following except?

Accepted Answer

Nephrotic syndrome

Answer

Cirrhosis

Answer

Budd-Chiari syndrome

Answer

Congestive cardiac failure

Question 5

A patient with a bleeding duodenal ulcer is managed conservatively. Which of the following treatment regimens is most likely to be successful?

Accepted Answer

Proton pump inhibitor (PPI) + Amoxicillin + Clarithromycin

Answer

Proton pump inhibitor (PPI) + Bismuth + Tetracycline + Metronidazole

Answer

Proton pump inhibitor (PPI) + Clarithromycin + Bismuth

Answer

Proton pump inhibitor (PPI) + Metronidazole

Question 6

A 50-year-old man became dizzy while passing stool and noticed fresh blood in the stool. Previous two concurrent colonoscopic examinations done for routine screening of carcinoma colon were normal. What is the most likely cause of the bleed?

Accepted Answer

Dilatation of veins of the colon

Answer

Early carcinoma of the colon

Answer

Sigmoid diverticulitis

Answer

Microscopic colitis

Question 7

Which of the following is NOT a feature of Zollinger-Ellison syndrome?

Accepted Answer

Large gastric ulcer

Answer

Diarrhea non-responsive to fasting

Answer

Epigastric pain

Answer

Secretin study is the investigation of choice

Question 8

A 25-year-old man presents with low-grade fever, weight loss, fatigue, crampy abdominal pain, episodic diarrhea, and postprandial bloating. Right lower quadrant tenderness is elicited on palpation of the abdomen. Capsule endoscopy reveals thickening of the terminal ileum, edema, marked luminal narrowing, and a cobblestone appearance of the mucosa. Which of the following is a characteristic of this condition?

Accepted Answer

It can cause fistula formation between loops of affected bowel.

Answer

Additional typical findings include crypt abscesses and pseudopolyps.

Answer

Inflammation and ulceration limited to mucosa and submucosa with sparing of deeper layers.

Answer

It can affect any portion of the gastrointestinal tract, but the proximal jejunum is the most common site of involvement.

Question 9

A 48-year-old man presents with increasing abdominal girth and yellowish skin over 5 months. Examination reveals scleral icterus, generalized jaundice, abdominal distension, and a fluid wave. Laboratory findings include total serum bilirubin of 5.2 mg/dL (direct 4.2 mg/dL), AST of 380 U/L, ALT of 158 U/L, alkaline phosphatase of 95 U/L, total protein of 6.4 g/dL, albumin of 2.2 g/dL, prothrombin time of 18 seconds, PTT of 30 seconds, and blood ammonia of 105 mmol/L. What is the most likely cause of these findings?

Accepted Answer

Alcoholic liver disease

Answer

Acute Hepatitis A virus infection

Answer

Choledocholithiasis

Answer

Metastatic adenocarcinoma

Question 10

An elderly patient presents with a prolonged history of weakness and lethargy. On examination, the patient is found to be anemic and stool is positive for occult blood. Which of the following is the investigation of choice?

Accepted Answer

Colonoscopy

Answer

Barium meal

Answer

Barium enema

Answer

CT abdomen

Gastroenterology — MCQs

Gastroenterology — MCQs

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