Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 761: What is the drug of choice for an acute exacerbation of ulcerative colitis?

A. Sulfasalazine
B. Mesalazine
C. Steroids (Correct Answer)
D. NSAIDs

Explanation: **Explanation:** The management of Ulcerative Colitis (UC) is divided into two phases: **Induction of remission** (treating acute flares) and **Maintenance of remission** [2]. **Why Steroids are the Correct Answer:** Systemic corticosteroids (e.g., oral Prednisolone or IV Hydrocortisone/Methylprednisolone) are the **drugs of choice for inducing remission** in an acute moderate-to-severe exacerbation [1]. They possess potent anti-inflammatory properties that rapidly suppress the immune response. However, they have no role in maintenance therapy due to significant long-term side effects. **Analysis of Incorrect Options:** * **A & B (Sulfasalazine/Mesalazine):** These are 5-ASA (Aminosalicylates) compounds. While they are the drug of choice for **maintaining remission** and treating **mild** UC, they are insufficient as monotherapy for a significant acute exacerbation [1]. * **D (NSAIDs):** These are strictly **contraindicated** in patients with Inflammatory Bowel Disease (IBD) as they can precipitate or worsen an acute flare by inhibiting protective prostaglandins in the gut mucosa. **High-Yield Clinical Pearls for NEET-PG:** * **Route of Administration:** For severe cases (Truelove and Witts criteria), **IV steroids** are the initial treatment. If there is no response in 3–5 days, switch to "rescue therapy" with **Infliximab** or **Cyclosporine**. * **Distal Disease:** For proctitis or distal colitis, **topical (rectal) steroids or 5-ASAs** are preferred over systemic therapy [1]. * **Monitoring:** Always rule out *Clostridioides difficile* and CMV infection in a patient presenting with a refractory acute flare. * **Surgery:** Total proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA) is curative for UC [3].

Question 762: Which of the following is true about Mallory-Weiss syndrome?

A. Associated with gastrointestinal reflux
B. Associated with obesity
C. Associated with a tumour at the gastroesophageal junction
D. Commonly seen in alcoholics (Correct Answer)

Explanation: **Explanation:** **Mallory-Weiss Syndrome (MWS)** is characterized by non-transmural, longitudinal mucosal lacerations at the gastroesophageal junction or gastric cardia. **Why the correct answer is right:** The primary pathophysiology involves a sudden increase in intra-abdominal pressure, most commonly due to forceful retching, vomiting, or coughing. It is **commonly seen in alcoholics** because chronic alcohol consumption leads to frequent episodes of binge drinking followed by violent vomiting (retching). Additionally, alcohol-induced gastritis can sensitize the mucosa to injury. **Analysis of Incorrect Options:** * **A. Associated with gastrointestinal reflux:** While GERD causes mucosal inflammation (esophagitis), it is not a direct cause of the mechanical shearing forces required to produce Mallory-Weiss tears. * **B. Associated with obesity:** Obesity is a risk factor for Hiatal Hernia (which is often found in MWS patients), but it is not a direct causative factor for the syndrome itself [1]. * **C. Associated with a tumour:** MWS is a mechanical traumatic injury. While a tumor might cause obstruction or vomiting, the syndrome is defined by the tear itself, not by an underlying malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Presentation:** Typically presents as painless hematemesis following an initial bout of non-bloody vomiting. * **Diagnosis:** Gold standard is **Upper GI Endoscopy**, which reveals linear mucosal tears. * **Management:** Most cases (80-90%) stop bleeding spontaneously. Active bleeding is managed endoscopically (clips, epinephrine, or thermal cautery). * **Differentiate from Boerhaave Syndrome:** MWS is a **mucosal tear** (partial thickness), whereas Boerhaave is a **transmural rupture** (full thickness) leading to pneumomediastinum and surgical emergency.

Question 763: A 50-year-old male executive presents to the casualty department with hematemesis. He reports vomiting all the food he had consumed prior to the hematemesis, followed by forceful retching. He had consumed alcohol the previous day. What is the most probable diagnosis?

A. Gastritis
B. Duodenal ulcer
C. Mallory-Weiss tear (Correct Answer)
D. Esophageal varices

Explanation: ### Explanation **Correct Option: C. Mallory-Weiss tear** **Reasoning:** The clinical hallmark of a **Mallory-Weiss tear (MWT)** is hematemesis following an initial episode of non-bloody vomiting or forceful retching [1]. The pathophysiology involves a longitudinal mucosal laceration at the **gastroesophageal junction** or distal esophagus, caused by a sudden increase in intra-abdominal pressure. This case is classic: the patient first vomited food, followed by forceful retching (increasing pressure), which then led to the tear and subsequent hematemesis. Alcohol consumption is a common predisposing factor as it induces gastric irritation and vomiting. **Why other options are incorrect:** * **Gastritis:** While alcohol can cause erosive gastritis, it typically presents with epigastric pain and coffee-ground emesis rather than brisk hematemesis following a specific sequence of non-bloody vomiting. * **Duodenal Ulcer:** This usually presents with chronic dyspepsia (relieved by food) and melena [2]. While it can cause hematemesis, it is not typically preceded by the "vomiting-then-retching" sequence. * **Esophageal Varices:** This usually presents as massive, painless hematemesis in a patient with signs of chronic liver disease (e.g., splenomegaly, jaundice). There is no characteristic preceding non-bloody vomit. **NEET-PG High-Yield Pearls:** * **Location:** Most tears (approx. 75%) occur just below the GE junction in the gastric mucosa. * **Diagnosis:** **Upper GI Endoscopy** is the gold standard (shows a linear mucosal tear). * **Management:** Most cases (80-90%) stop bleeding spontaneously with supportive care (PPIs, fluids) [1]. If persistent, endoscopic therapy (clips or epinephrine) is used. * **Distinction:** Do not confuse MWT with **Boerhaave Syndrome**, which is a *transmural* perforation of the esophagus (presents with Mackler’s triad: vomiting, chest pain, and subcutaneous emphysema).

Question 764: Gastroesophageal reflux disease (GERD) in the absence of endoscopic esophagitis is seen in which of the following conditions?

A. Partially treated cases with proton pump inhibitors (PPIs) (Correct Answer)
B. Scleroderma
C. Chronic renal failure (CRF)
D. Cirrhosis

Explanation: The diagnosis of Gastroesophageal Reflux Disease (GERD) is based on symptoms (heartburn, regurgitation) and/or endoscopic evidence of esophageal mucosal damage. However, a significant number of patients exhibit symptoms without visible mucosal injury on endoscopy. **Why Option A is Correct:** Proton Pump Inhibitors (PPIs) are highly effective at healing esophageal erosions. In patients with pre-existing erosive esophagitis, even a short course of PPI therapy can lead to rapid mucosal healing [1]. Consequently, if an endoscopy is performed while the patient is on PPIs or has recently completed a course, the esophagitis may have resolved, leaving the patient with "Non-Erosive Reflux Disease" (NERD) or "partially treated GERD." This is the most common clinical scenario where GERD symptoms persist in the absence of endoscopic findings. **Why the Other Options are Incorrect:** * **B. Scleroderma:** Systemic sclerosis typically causes severe esophageal dysmotility and a hypotensive lower esophageal sphincter (LES). This leads to profound acid reflux, which almost always results in severe, visible erosive esophagitis or Barrett’s esophagus. * **C. Chronic Renal Failure (CRF):** While CRF patients may have GI symptoms, there is no specific association with non-erosive GERD. In fact, hypergastrinemia seen in some renal patients might actually increase LES tone. * **D. Cirrhosis:** Patients with cirrhosis and ascites have increased intra-abdominal pressure, which predisposes them to reflux. If GERD occurs, it is more likely to be erosive due to the mechanical nature of the reflux. **High-Yield Clinical Pearls for NEET-PG:** * **NERD (Non-Erosive Reflux Disease):** Defined as the presence of classic GERD symptoms in the absence of esophageal mucosal injury on standard endoscopy [1]. It accounts for approximately 60-70% of GERD cases. * **Gold Standard:** For patients with NERD, **24-hour ambulatory pH monitoring** is the gold standard to confirm the diagnosis by correlating symptoms with acid reflux episodes. * **Los Angeles (LA) Classification:** Used to grade the severity of endoscopic esophagitis (Grade A to D).

Question 765: All of the following are true regarding carcinoid syndrome, EXCEPT:

A. Flushing associated with it affects the upper part of the body.
B. Tricuspid regurgitation is the most common cardiac lesion.
C. Midgut carcinoids account for 60-70% of cases of carcinoid syndrome.
D. Serotonin appears to be involved in the flushing symptoms. (Correct Answer)

Explanation: **Explanation:** Carcinoid syndrome occurs when neuroendocrine tumors (NETs) secrete vasoactive substances directly into the systemic circulation, bypassing hepatic metabolism. This typically happens with midgut carcinoids that have metastasized to the liver [1]. **Why Option D is the Correct (False) Statement:** While **Serotonin (5-HT)** is the primary mediator responsible for diarrhea and endocardial fibrosis in carcinoid syndrome, it is **not** the primary cause of flushing. Flushing is mediated by **kinins, histamine, and prostaglandins**. In gastric carcinoids, histamine is the major culprit, whereas in midgut carcinoids, tachykinins (like Substance P) are implicated. **Analysis of Other Options:** * **Option A:** Flushing typically involves the face, neck, and upper chest (the "blush area"). It is often triggered by alcohol, chocolate, or emotional stress. * **Option B:** Carcinoid heart disease primarily affects the right side of the heart. **Tricuspid Regurgitation (TR)** is the most common lesion, followed by pulmonary stenosis. Left-sided lesions are rare because the lungs contain monoamine oxidase (MAO), which inactivates serotonin. * **Option C:** Midgut carcinoids (ileum and jejunum) are the most frequent cause of the syndrome, accounting for approximately 60-70% of cases. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnostic Marker:** 24-hour urinary **5-HIAA** (5-hydroxyindoleacetic acid) is the initial screening test of choice. * **Localization:** **Chromogranin A** is a non-specific serum marker; **Ga-68 DOTATATE PET/CT** is the most sensitive imaging modality. * **Management:** **Octreotide** (Somatostatin analog) is the gold standard for controlling symptoms and preventing a "carcinoid crisis" during surgery. * **Pellagra Connection:** Chronic carcinoid syndrome can lead to **Niacin (Vitamin B3) deficiency** because dietary tryptophan is diverted to synthesize serotonin instead of nicotinic acid [2].

Question 766: The amount of blood lost in the gastrointestinal tract to produce a single black stool is approximately?

A. < 20 ml
B. 30-40 ml
C. 60-70 ml (Correct Answer)
D. 100-110 ml

Explanation: **Explanation:** The correct answer is **60-70 ml (Option C)**. **Medical Concept:** Melena is defined as the passage of black, tarry, foul-smelling stools. This characteristic appearance results from the degradation of hemoglobin by gastric acid and intestinal bacteria into **hematin** and other hemochromes. For melena to occur, two conditions must typically be met: 1. The blood must remain in the GI tract for at least **8 to 14 hours** to allow for degradation. 2. A minimum volume of blood must be lost. Clinical studies have shown that a single black stool can be produced with as little as **50 to 100 ml** of blood loss. Therefore, 60-70 ml is the most accurate range among the provided options. **Analysis of Options:** * **A (< 20 ml):** This volume is insufficient to cause visible melena. It may result in a positive Fecal Occult Blood Test (FOBT) but will not change the stool's color or consistency. * **B (30-40 ml):** While closer, this volume is generally below the threshold required to produce the classic "tarry" appearance of melena. * **D (100-110 ml):** While 100 ml can certainly cause melena, the question asks for the *approximate minimum* amount required to produce a single stool; 60-70 ml is the established physiological threshold. **NEET-PG High-Yield Pearls:** * **Site of Bleeding:** Melena usually indicates bleeding **proximal to the Ligament of Treitz** (Upper GI Bleed). However, bleeding from the small intestine or right colon can occasionally present as melena if transit is slow. * **Hematochezia:** Usually signifies Lower GI bleeding, but can occur in brisk Upper GI bleeds (loss of >1000 ml) due to rapid transit. * **False Melena:** Ingestion of iron supplements, bismuth (Pepto-Bismol), or charcoal can turn stools black, but they will lack the characteristic "tarry" consistency and foul odor [1].

Question 767: A patient presents with esophageal varices and a liver span of 19cm. What are the likely causes?

A. Hemochromatosis
B. Alcoholic liver disease
C. Budd-Chiari syndrome
D. All of the above (Correct Answer)

Explanation: The clinical presentation of **esophageal varices** indicates portal hypertension [1], while a **liver span of 19 cm** (normal is 12–15 cm) confirms **hepatomegaly**. In most cases of advanced cirrhosis, the liver becomes shrunken and nodular. However, certain etiologies of portal hypertension are classically associated with an enlarged liver [2]. 1. **Hemochromatosis:** Iron deposition in the hepatic parenchyma leads to both cirrhosis and significant hepatomegaly [2]. 2. **Alcoholic Liver Disease:** While late-stage alcoholic cirrhosis results in a small liver, the earlier stages of alcoholic hepatitis and fatty infiltration (steatosis) cause marked hepatomegaly alongside portal hypertension [2]. 3. **Budd-Chiari Syndrome:** This is caused by hepatic venous outflow obstruction [2]. The resulting severe congestive hepatopathy leads to a large, tender liver and rapid development of portal hypertension (varices) [3]. **Why "All of the Above" is correct:** All three conditions are high-yield causes of **"Cirrhosis with Hepatomegaly."** While cirrhosis usually implies a small liver, these specific pathologies maintain or increase liver volume despite the presence of portal hypertension [2], [3]. **NEET-PG High-Yield Pearls:** * **Causes of Cirrhosis with Hepatomegaly:** Remember the mnemonic **"HAAM"** — **H**emochromatosis, **A**lcoholic liver disease, **A**myloidosis, and **M**yeloproliferative disorders (or **M**alignancy/HCC). * **Budd-Chiari Triad:** Abdominal pain, ascites, and hepatomegaly [3]. * **Small Liver:** Classically seen in Post-necrotic cirrhosis (Viral Hepatitis B/C). * **Regenerative Nodules:** In Budd-Chiari, the caudate lobe often undergoes compensatory hypertrophy because it has independent venous drainage into the IVC [3].

Question 768: Ascitic fluid with a Transudate Serum-Ascites Albumin Gradient (SAAG) and low albumin is found in which of the following conditions?

A. Tuberculosis
B. Congestive Heart Failure (CHF) (Correct Answer)
C. Cirrhosis
D. Pancreatitis

Explanation: To approach this question, we must analyze two parameters: the **Serum-Ascites Albumin Gradient (SAAG)** and the **Ascitic Fluid Total Protein (AFTP)**. ### 1. Understanding the Correct Answer: Congestive Heart Failure (CHF) The SAAG is calculated as *(Serum Albumin - Ascitic Fluid Albumin)*. * **High SAAG (≥ 1.1 g/dL):** Indicates Portal Hypertension (Transudate) [1]. * **Low SAAG (< 1.1 g/dL):** Indicates non-portal hypertensive causes (Exudate) [1]. In **CHF**, there is increased hydrostatic pressure in the hepatic veins (Post-sinusoidal hypertension), leading to a **High SAAG (Transudate)** [1]. However, unlike Cirrhosis, the liver's synthetic function is initially preserved, and the hepatic sinusoids remain permeable. This allows proteins to leak into the ascitic fluid, resulting in a **High Ascitic Fluid Protein (> 2.5 g/dL)** [1]. *Note: The question uses "low albumin" in the fluid to describe a Transudate (High SAAG), which is characteristic of CHF.* ### 2. Why the Other Options are Incorrect * **Cirrhosis (Option C):** While it also presents with a High SAAG (Transudate), it typically has **Low Ascitic Fluid Protein (< 2.5 g/dL)** because the scarred liver (fibrosis) prevents protein from entering the space [1]. * **Tuberculosis (Option A) & Pancreatitis (Option D):** These are inflammatory conditions that cause a **Low SAAG (< 1.1 g/dL)** because the primary mechanism is increased capillary permeability (Exudate), not portal hypertension [1]. ### 3. NEET-PG High-Yield Pearls * **High SAAG + High Protein (> 2.5):** CHF, Budd-Chiari Syndrome (early), Constrictive Pericarditis [1]. * **High SAAG + Low Protein (< 2.5):** Cirrhosis, Late Budd-Chiari [1]. * **Low SAAG + High Protein:** TB, Malignancy, Pancreatitis, Nephrotic Syndrome (though protein can be low here) [1]. * **Most common cause of Ascites:** Cirrhosis (75%). * **Gold Standard for diagnosing Spontaneous Bacterial Peritonitis (SBP):** Absolute Neutrophil Count (ANC) > 250 cells/mm³.

Question 769: A 40-year-old female patient presented with dysphagia to both liquids and solids and regurgitation for 3 months. The dysphagia was non-progressive. What is the most likely diagnosis?

A. Carcinoma of the esophagus
B. Lower esophageal mucosal ring
C. Achalasia cardia (Correct Answer)
D. Reflux esophagitis with esophageal stricture

Explanation: ### Explanation **Correct Answer: C. Achalasia cardia** The clinical hallmark of **Achalasia cardia** is **simultaneous dysphagia to both liquids and solids** from the onset [1]. This occurs due to the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis in the distal esophagus (aperistalsis) [1]. The non-progressive nature and the presence of regurgitation in a middle-aged patient further support this diagnosis. **Analysis of Incorrect Options:** * **A. Carcinoma of the Esophagus:** Characterized by **progressive dysphagia**, initially starting with solids and later involving liquids [3]. It is typically associated with significant weight loss and occurs in older age groups. * **B. Lower Esophageal Mucosal Ring (Schatzki Ring):** Presents as **intermittent dysphagia** specifically to solids (the "steakhouse syndrome"). It does not typically cause liquid dysphagia [3]. * **D. Reflux Esophagitis with Stricture:** This is a mechanical obstruction resulting from chronic GERD. Like carcinoma, it presents with **progressive dysphagia** (solids followed by liquids) and usually has a long-standing history of heartburn [2]. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Esophageal **Manometry** (shows incomplete LES relaxation and aperistalsis) [1]. * **Barium Swallow Finding:** "Bird’s beak" or "Rat-tail" appearance. * **Pathology:** Degeneration of the **Auerbach’s (myenteric) plexus** [1]. * **Treatment of Choice:** Laparoscopic Heller’s Myotomy with partial fundoplication or POEM (Peroral Endoscopic Myotomy). * **Chagas Disease:** A common secondary cause of achalasia (caused by *Trypanosoma cruzi*).

Question 770: Which of the following is NOT a cause of conjugated hyperbilirubinemia?

A. Dubin-Johnson syndrome
B. Rotor syndrome
C. Gilbert syndrome (Correct Answer)
D. Primary biliary cirrhosis

Explanation: ### Explanation Hyperbilirubinemia is categorized into **unconjugated (indirect)** and **conjugated (direct)** based on whether the bilirubin has undergone glucuronidation in the liver [2]. **Why Gilbert Syndrome is the Correct Answer:** Gilbert syndrome is a common, benign autosomal recessive condition characterized by reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)** [1]. This enzyme is responsible for conjugating bilirubin with glucuronic acid. A deficiency leads to impaired conjugation, resulting in isolated **unconjugated hyperbilirubinemia**, typically triggered by stress, fasting, or illness [1], [3]. **Analysis of Incorrect Options:** * **Dubin-Johnson Syndrome:** An autosomal recessive disorder caused by a defect in the **MRP2 gene**, which impairs the excretion of conjugated bilirubin into the bile canaliculi. This leads to conjugated hyperbilirubinemia and a characteristic **black liver** due to melanin-like pigment deposition. * **Rotor Syndrome:** Similar to Dubin-Johnson but involves defects in **OATP1B1 and OATP1B3** transporters. It results in conjugated hyperbilirubinemia without the dark liver pigmentation. * **Primary Biliary Cirrhosis (PBC):** An autoimmune destruction of intrahepatic bile ducts. This obstructive (cholestatic) process prevents the drainage of already conjugated bilirubin [2], leading to conjugated hyperbilirubinemia. **High-Yield Clinical Pearls for NEET-PG:** * **Crigler-Najjar Syndrome (Type I & II):** Also causes unconjugated hyperbilirubinemia due to UGT1A1 deficiency (Type I is total absence; Type II is severe deficiency) [1]. * **Urine Bilirubin:** Only conjugated bilirubin is water-soluble and can appear in urine (**bilirubinuria**) [3], [4]. Therefore, urine is dark in Dubin-Johnson and Rotor, but normal in Gilbert syndrome. * **Oral Cholecystography:** The gallbladder is visualized in Rotor syndrome but **not** in Dubin-Johnson syndrome.

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Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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