Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 931: In a patient with a gastric ulcer, repeat upper GI endoscopy to assess healing and confirm absence of malignancy is performed after how many weeks of PPI therapy?

A. 2 weeks
B. 4 weeks
C. 6 weeks (Correct Answer)
D. 12 weeks

Explanation: Explanation: 1. Why 6 weeks is the correct answer: Gastric ulcers (GU), unlike duodenal ulcers, carry a significant risk of underlying malignancy (approximately 2–5%). Therefore, "healing" must be documented both endoscopically and histologically. Standard medical therapy with Proton Pump Inhibitors (PPIs) typically achieves significant mucosal healing within 6 to 8 weeks [1]. Performing a repeat endoscopy at 6 weeks allows sufficient time for a benign ulcer to show healing while ensuring that any non-healing or suspicious lesion is biopsied promptly to rule out gastric adenocarcinoma. 2. Why the other options are incorrect: * A (2 weeks): This is too early. Most benign ulcers will not have achieved significant re-epithelialization, leading to unnecessary concern or premature biopsy results. * B (4 weeks): While some healing occurs, 4 weeks is often insufficient for complete resolution of larger gastric ulcers. The standard of care remains 6–8 weeks for a definitive assessment. * D (12 weeks): Waiting 3 months is dangerously long. If the ulcer is malignant, this delay allows for potential tumor progression and metastasis. 3. High-Yield Clinical Pearls for NEET-PG: * Rule of Thumb: All gastric ulcers must be biopsied at the time of initial diagnosis (usually 6–8 samples from the ulcer margin) and followed to complete healing. * Duodenal Ulcers (DU): These are almost never malignant. Therefore, routine follow-up endoscopy to document healing is not required for DU unless symptoms persist. * Refractory Ulcers: If a gastric ulcer hasn't healed after 8–12 weeks of PPI therapy, it is considered "refractory," and one must consider malignancy, Z-E Syndrome, or non-compliance. * H. pylori: Always check for H. pylori in GU patients, as eradication significantly reduces recurrence [1].

Question 932: Serum ascites-to-albumin gradient is > 1.1 in which of the following conditions?

A. Nephrotic syndrome
B. Pancreatitis
C. Peritoneal carcinomatosis
D. Budd-Chiari syndrome (Correct Answer)

Explanation: **Explanation:** The **Serum-Ascites Albumin Gradient (SAAG)** is the most reliable tool for classifying ascites, replacing the old "exudate vs. transudate" system [1]. It is calculated as: *SAAG = (Serum Albumin) – (Ascitic Fluid Albumin)* **1. Why Budd-Chiari Syndrome is Correct:** A **SAAG ≥ 1.1 g/dL** indicates the presence of **Portal Hypertension** [1]. In Budd-Chiari syndrome (hepatic vein thrombosis), there is a post-sinusoidal obstruction to blood flow. This increases hydrostatic pressure within the hepatic sinusoids, forcing fluid into the peritoneal cavity while keeping large molecules like albumin in the vascular space. This high pressure-gradient results in a high SAAG [1]. **2. Why the Other Options are Incorrect:** * **Nephrotic Syndrome:** Characterized by severe hypoalbuminemia. Since the serum albumin is very low, the gradient between serum and ascites remains **< 1.1 g/dL**. * **Pancreatitis:** Ascites results from inflammation or ductal leakage. This is a "non-portal hypertensive" cause where protein leaks into the fluid, resulting in a **SAAG < 1.1 g/dL** [1]. * **Peritoneal Carcinomatosis:** Malignancy causes direct peritoneal irritation and increased capillary permeability. High protein content in the fluid leads to a **SAAG < 1.1 g/dL** [1]. **Clinical Pearls for NEET-PG:** * **High SAAG (≥ 1.1):** Cirrhosis (most common), Heart Failure, Budd-Chiari, Portal Vein Thrombosis [1]. * **Low SAAG (< 1.1):** TB Peritonitis, Malignancy, Pancreatitis, Nephrotic Syndrome [1]. * **High Protein High SAAG:** If SAAG is > 1.1 and Ascitic Protein is > 2.5 g/dL, think of **Cardiac Ascites** or early **Budd-Chiari** [1]. * **Low Protein High SAAG:** If SAAG is > 1.1 and Ascitic Protein is < 2.5 g/dL, think of **Cirrhosis** [1].

Question 933: All of the following are precipitating factors for hepatic encephalopathy in patients with chronic liver disease except?

A. Hypokalemia
B. Hyponatremia
C. Hypoxia
D. Metabolic acidosis (Correct Answer)

Explanation: **Explanation:** Hepatic Encephalopathy (HE) is triggered by factors that either increase ammonia production, decrease its clearance, or enhance its entry into the brain. **Why Metabolic Acidosis is the Correct Answer:** Metabolic acidosis is **not** a precipitating factor; in fact, **Metabolic Alkalosis** is a classic trigger. In an alkaline environment, ammonium ions ($NH_4^+$) are converted into ammonia gas ($NH_3$). Unlike the charged ion, $NH_3$ is lipid-soluble and can easily cross the blood-brain barrier, worsening neurotoxicity. Acidosis actually favors the formation of $NH_4^+$, which stays trapped in the blood and is excreted. **Analysis of Incorrect Options:** * **Hypokalemia:** Low potassium leads to intracellular movement of $H^+$ ions, creating an intracellular acidosis that stimulates renal ammonia production (ammoniagenesis). It also contributes to metabolic alkalosis. * **Hyponatremia:** Low sodium causes osmotic swelling of astrocytes, which are already stressed by high glutamine levels in HE, leading to cerebral edema. * **Hypoxia:** Oxygen deprivation sensitizes the brain to the toxic effects of ammonia and impairs hepatic metabolic function. **High-Yield Clinical Pearls for NEET-PG:** * **Most common precipitant:** Azotemia (due to diuretics or GI bleed) and Infections (SBP). * **The "Ammonia Trap":** Acidifying the gut with **Lactulose** converts $NH_3$ to $NH_4^+$, preventing absorption—this is the basis of treatment. * **Other Triggers:** Constipation (increased gut transit time), high protein diet, and sedative use (GABA-A agonists). * **Drug of Choice:** Lactulose (first-line) and Rifaximin (add-on for prophylaxis).

Question 934: Which of the following is NOT a typical sign of liver cell failure?

A. Palmar erythema
B. Clubbing
C. Dupuytren's contracture
D. Splinter hemorrhages (Correct Answer)

Explanation: **Explanation:** The correct answer is **Splinter hemorrhages**. These are linear, reddish-brown streaks found under the nail bed, most classically associated with **Infective Endocarditis** (due to septic emboli or immune complex vasculitis) [1]. They are not a feature of chronic liver disease or liver cell failure. **Analysis of Options:** * **Palmar Erythema:** This is a classic sign of liver cell failure. It occurs due to an altered metabolism of sex hormones, leading to increased circulating **estrogen**, which causes peripheral vasodilation, specifically on the thenar and hypothenar eminences. * **Clubbing:** While often associated with pulmonary or cardiac issues, clubbing is a recognized feature of chronic liver disease, particularly **Primary Biliary Cholangitis (PBC)** and cirrhosis. It is thought to result from increased hepatopulmonary shunting and growth factors. * **Dupuytren's Contracture:** This involves the thickening and shortening of the palmar fascia, leading to flexion deformities of the fingers (usually the ring finger). While also seen in diabetes and manual laborers, it has a strong clinical association with **Alcoholic Liver Disease**. **High-Yield Clinical Pearls for NEET-PG:** * **Hyperestrogenism signs:** Palmar erythema, Spider Naevi (found in the distribution of the Superior Vena Cava), and Gynecomastia. * **Spider Naevi:** A single spider naevus can be normal, but $>5$ are highly suggestive of liver cirrhosis. * **Other Nail Signs in Liver Failure:** * **Terry’s Nails:** Proximal 2/3rd of the nail is white, distal 1/3rd is red (due to hypoalbuminemia). * **Muehrcke’s Lines:** Paired white transverse lines (due to hypoalbuminemia). * **Leuconychia:** White nails associated with impaired albumin synthesis in chronic liver injury [2].

Question 935: A 41-year-old patient presented with chronic diarrhea for 3 months. A d-xylose absorption test was ordered to investigate for which of the following?

A. Carbohydrate malabsorption due to mucosal disease (Correct Answer)
B. Carbohydrate malabsorption due to chronic pancreatitis
C. Fat malabsorption due to mucosal disease
D. Fat malabsorption due to chronic pancreatitis

Explanation: The **D-xylose absorption test** is a classic diagnostic tool used to differentiate between **malabsorption caused by mucosal disease** [1] (e.g., Celiac disease, Tropical sprue) and **maldigestion caused by pancreatic insufficiency**. **1. Why Option A is Correct:** D-xylose is a pentose sugar that is absorbed via the proximal small intestinal mucosa through passive diffusion (and some facilitated transport). Unlike complex carbohydrates, it **does not require pancreatic enzymes** (like amylase) for digestion. Therefore, if D-xylose levels are low in the blood or urine after ingestion, it indicates that the intestinal mucosa itself is damaged or has a reduced surface area, preventing absorption [1]. **2. Why Other Options are Incorrect:** * **Options B & D (Chronic Pancreatitis):** In pancreatic insufficiency, the secretion of digestive enzymes is impaired. Since D-xylose does not require pancreatic enzymes for breakdown, its absorption remains **normal** in patients with chronic pancreatitis [1]. This makes the test excellent for ruling out pancreatic causes of steatorrhea. * **Option C (Fat Malabsorption):** While mucosal diseases often cause fat malabsorption, the D-xylose test specifically measures the handling of a **monosaccharide (carbohydrate)**. It is not a direct measure of lipid processing. **Clinical Pearls for NEET-PG:** * **Normal Result:** >4g excreted in urine over 5 hours (after a 25g oral dose). * **False Positives:** Low urinary D-xylose can occur despite normal mucosa in cases of **renal insufficiency**, **ascites**, or **Small Intestinal Bacterial Overgrowth (SIBO)** (bacteria metabolize the sugar before absorption) [1]. * **Gold Standard:** While historically high-yield, the D-xylose test has largely been replaced in clinical practice by distal duodenal biopsy and serological markers (e.g., anti-tTG).

Question 936: What is the best diagnostic method for acute appendicitis?

A. History
B. Physical examination (Correct Answer)
C. X-ray abdomen
D. Barium meal

Explanation: **Explanation:** Acute appendicitis is primarily a **clinical diagnosis**. In the context of the NEET-PG exam and standard surgical teaching, the **physical examination** remains the most important diagnostic tool. **Why Physical Examination is Correct:** The diagnosis is established through classic signs elicited during a physical exam. These include tenderness at **McBurney’s point**, guarding, and rebound tenderness (Blumberg sign). Specific maneuvers like the **Rovsing sign** (indirect tenderness), **Psoas sign** (retrocecal appendix), and **Obturator sign** (pelvic appendix) are highly suggestive. While imaging is used in doubtful cases, a skilled clinical examination has high sensitivity and specificity, often precluding the need for radiation. Acute appendicitis should be treated by early surgery, since there is a risk of perforation and recurrent attacks with non-operative treatment [1]. **Why Other Options are Incorrect:** * **History:** While history (migratory pain starting periumbilical and moving to the right iliac fossa) is crucial, it is subjective. The physical exam provides the objective evidence of peritoneal irritation required for a surgical decision. * **X-ray Abdomen:** This is generally non-specific. While it may show a "sentinel loop" or a fecalith (appendicolith) in 5-10% of cases, it cannot definitively diagnose appendicitis. * **Barium Meal:** This is contraindicated in acute appendicitis due to the risk of perforation and peritonitis. **Clinical Pearls for NEET-PG:** * **Gold Standard Imaging:** Contrast-Enhanced CT (CECT) is the most accurate imaging modality (especially in adults). * **First-line Imaging in Children/Pregnancy:** Ultrasonography (USG). * **Alvarado Score (MANTRELS):** A clinical scoring system used to predict the likelihood of appendicitis; a score of ≥7 usually indicates surgery. * **Most common position:** Retrocecal (75%).

Question 937: A patient presents with dysphagia of 4 weeks duration and can now swallow only liquid food. Which of the following investigations should be performed first?

A. Barium studies
B. Upper GI endoscopy (Correct Answer)
C. CT scan
D. Esophageal manometry

Explanation: The patient presents with **progressive dysphagia** (transitioning from solids to liquids) of short duration (4 weeks), which is a "red flag" symptom highly suggestive of a mechanical obstruction, most likely **Esophageal Carcinoma**. [1] **1. Why Upper GI Endoscopy (UGIE) is the correct answer:** In any patient presenting with new-onset dysphagia, especially in the elderly or those with rapid progression, the primary goal is to rule out malignancy. UGIE is the **investigation of choice** because it allows for direct visualization of the esophageal mucosa and, most importantly, enables a **tissue biopsy** for definitive histopathological diagnosis [1]. **2. Why other options are incorrect:** * **Barium studies:** While useful for defining the anatomy of a stricture or identifying a "bird’s beak" appearance in achalasia, it cannot provide a tissue diagnosis. It is generally reserved for patients with a suspected pharyngeal pouch (Zenker’s diverticulum) to prevent accidental perforation during endoscopy [2]. * **CT scan:** This is used for **staging** esophageal cancer (evaluating local spread and distant metastasis) but is not the initial diagnostic tool for dysphagia. * **Esophageal manometry:** This is the gold standard for **motility disorders** (like Achalasia cardia). However, mechanical obstruction must always be ruled out via endoscopy before considering a motility disorder [1]. **Clinical Pearls for NEET-PG:** * **Progressive dysphagia** (Solids → Liquids) = Mechanical obstruction (e.g., Cancer, Peptic stricture) [1]. * **Intermittent/Simultaneous dysphagia** (Solids & Liquids together) = Motility disorder (e.g., Achalasia) [2]. * **Best initial test for dysphagia:** Upper GI Endoscopy [1]. * **Gold standard for Achalasia:** Esophageal Manometry [1] [2].

Question 938: Which investigation is considered the gold standard for diagnosing oesophageal motility disorders?

A. Barium studies
B. Endoscopy (Correct Answer)
C. 24-hour pH monitoring
D. Manometry

Explanation: **Explanation:** The diagnosis of esophageal disorders follows a specific clinical hierarchy. While **Manometry** is the gold standard for *characterizing* and *confirming* specific motility patterns (like Achalasia or Diffuse Esophageal Spasm), **Endoscopy (Esophagogastroduodenoscopy - EGD)** is considered the essential first-line "gold standard" investigation to **rule out structural or organic lesions** (such as malignancy or strictures) that can mimic motility disorders (pseudoachalasia) [1]. In clinical practice and exam scenarios, one must always exclude mechanical obstruction before diagnosing a primary motility issue [1]. **Analysis of Options:** * **B. Endoscopy (Correct):** It is the definitive tool to visualize the mucosa and rule out secondary causes of dysphagia (e.g., esophageal cancer) which is the mandatory first step in the diagnostic algorithm [1], [2]. * **D. Manometry:** While it is the most sensitive test for measuring pressure and coordination of peristalsis (High-Resolution Manometry is the gold standard for *functional* diagnosis), it is performed only after structural lesions are ruled out by EGD [1]. * **A. Barium Studies:** Useful for visualizing anatomy (e.g., "Bird’s beak" appearance in Achalasia or "Corkscrew esophagus"), but it lacks the sensitivity of manometry and the biopsy capability of endoscopy [1]. * **C. 24-hour pH monitoring:** This is the gold standard for diagnosing **Gastroesophageal Reflux Disease (GERD)**, not motility disorders. **NEET-PG High-Yield Pearls:** * **Achalasia Cardia:** Best initial test is Barium Swallow; Most accurate/Gold standard for functional diagnosis is Manometry (shows incomplete LES relaxation and aperistalsis) [1]. * **Nutcracker Esophagus:** Characterized by high-amplitude peristaltic contractions (>180 mmHg) [1]. * **Rule of Thumb:** In any patient with dysphagia, the first step is usually to exclude malignancy via Endoscopy [1].

Question 939: A follow-up patient of GERD on endoscopy was having a nodule in the 2nd part of the duodenum, which hormone are you suspecting to be raised?

A. Inulin
B. Glucagon
C. VIP
D. Gastrin (Correct Answer)

Explanation: ***Gastrin*** - The presence of a nodule in the second part of the duodenum, a common location within the **gastrinoma triangle** (Passaro's triangle), combined with GERD, strongly suggests a **gastrinoma**. - Gastrinomas cause **Zollinger-Ellison Syndrome (ZES)** by secreting excessive **gastrin**, which leads to gastric acid hypersecretion, resulting in refractory peptic ulcers and severe GERD [1]. *Inulin* - **Inulin** is a polysaccharide, not a hormone, and it is used clinically to measure the **glomerular filtration rate (GFR)**. - If this option meant **insulin**, an insulinoma would cause symptoms of **hypoglycemia**, such as sweating, tremors, and confusion, not GERD. *VIP* - A tumor secreting **Vasoactive Intestinal Peptide (VIPoma)** causes **WDHA syndrome**, characterized by **W**atery **D**iarrhea, **H**ypokalemia, and **A**chlorhydria. - This condition is associated with **low stomach acid** (achlorhydria), which is contrary to the hyperacidity that causes GERD. *Glucagon* - A **glucagonoma** is a tumor that secretes excess glucagon, leading to a syndrome characterized by **diabetes mellitus** and a classic skin rash known as **necrolytic migratory erythema**. - It is not associated with gastric acid hypersecretion or duodenal nodules presenting with GERD.

Question 940: Which of the following is a recommended treatment for esophageal varices?

A. Transjugular intrahepatic portosystemic shunt (TIPS)
B. Endoscopic ligation (Correct Answer)
C. Intravenous labetalol
D. Oral amoxicillin

Explanation: ***Endoscopic ligation*** - This is a first-line endoscopic therapy for both actively bleeding esophageal varices and for the primary and secondary prevention of variceal hemorrhage [1]. - The procedure, also known as **variceal banding**, involves placing small rubber bands around the varices to ligate them, leading to thrombosis and eventual sloughing off [1]. *Transjugular intrahepatic portosystemic shunt (TIPS)* - TIPS is considered a second-line or salvage therapy for variceal bleeding that is refractory to endoscopic and pharmacological treatments [2]. - It is an invasive procedure that creates a shunt to reduce **portal pressure**, but it is reserved for uncontrolled bleeding due to risks such as **hepatic encephalopathy** [2]. *Intravenous labetalol* - While non-selective beta-blockers like **propranolol** or **nadolol** are used for the prophylaxis of variceal bleeding, they are not the treatment for an acute bleed. Vasoactive drugs like **terlipressin** or **octreotide** are used instead [1]. - Labetalol is a beta-blocker primarily used to manage **hypertension** and is not indicated for the acute management of variceal hemorrhage. *Oral amoxicillin* - Antibiotic prophylaxis (typically with intravenous third-generation cephalosporins like **ceftriaxone**) is recommended in patients with cirrhosis and variceal bleeding to prevent **spontaneous bacterial peritonitis (SBP)**. - Antibiotics do not treat the varices directly or stop the bleeding; they are given to reduce mortality associated with infections in this patient population.

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

Practice Questions

Pancreatitis (Acute and Chronic)

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Liver Diseases and Cirrhosis

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

Practice Questions

Gastrointestinal Motility Disorders

Practice Questions

Gastrointestinal Malignancies

Practice Questions

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