Gastroenterology Practice Questions

Q: A 65-year-old patient with coronary artery disease was on Aspirin for 2 years. He now complains of black stools. Abdominal examination is normal. What is the most probable diagnosis?

Duodenal ulcer. **Explanation:** The patient presents with **melena** (black, tarry stools), which is a hallmark sign of **Upper Gastrointestinal Bleeding (UGIB)**. The most significant clue in the history is the long-term use of **Aspirin**, a Non-Steroidal Anti-Inflammatory Drug (NSAID) [1]. **1. Why Duodenal Ulcer is correct:** NSAIDs like Aspirin inhibit the COX-1 enzyme, leading to decreased synthesis of prostaglandins. Prostaglandins are essential for maintaining the gastric mucosal barrier. Their depletion results in mucosal injury, making **Peptic Ulcer Disease (PUD)** the most common cause of UGIB. Statistically, duodenal ulcers are more common than gastric ulcers in the context of chronic NSAID use and are a frequent source of melena [1]. **2. Why other options are incorrect:** * **Ileocecal TB:** Usually presents with chronic abdominal pain, fever, weight loss, and altered bowel habits (diarrhea/constipation). While it can cause bleeding, it typically presents as hematochezia (bright red blood) or occult blood, not gross melena. * **Carcinoma of Colon:** Right-sided colon cancers cause occult bleeding and anemia; left-sided cancers cause altered bowel habits and hematochezia. Melena is rare as the bleeding source is distal to the ligament of Treitz. * **Esophageal Varices:** While a common cause of UGIB, it is associated with portal hypertension (cirrhosis, jaundice, splenomegaly). This patient has no history of liver disease but has a clear risk factor (Aspirin) for PUD [2]. **Clinical Pearls for NEET-PG:** * **Most common cause of UGIB:** Peptic Ulcer Disease [2]. * **Melena** indicates that blood has been present in the GI tract for at least 8 hours and usually originates proximal to the ligament of Treitz. * **Prophylaxis:** Patients on long-term Aspirin with high GI risk should be co-prescribed a Proton Pump Inhibitor (PPI) [1].

Q: A patient develops a persistent macrocytic anemia. Serum folate levels are normal, but serum vitamin B12 levels are low. Oral vitamin absorption studies demonstrate that the patient is unable to absorb vitamin B12 in adequate amounts. Cancer of which of the following organs is most strongly associated with this patient's condition?

Stomach. **Explanation:** The patient presents with **macrocytic anemia** and **Vitamin B12 deficiency** (low serum B12, normal folate) due to malabsorption. The most common cause of Vitamin B12 malabsorption related to the stomach is **Pernicious Anemia**. **Why the Stomach is Correct:** Vitamin B12 (cobalamin) absorption requires **Intrinsic Factor (IF)**, a glycoprotein secreted by the **parietal cells** of the gastric fundus and body [3]. In Pernicious Anemia, autoimmune destruction of parietal cells leads to a lack of IF, preventing B12 absorption in the terminal ileum [1]. Patients with Pernicious Anemia have a **3-fold to 6-fold increased risk of Gastric Adenocarcinoma** and are also at risk for gastric carcinoid tumors due to chronic hypergastrinemia and atrophic gastritis [2]. **Why Other Options are Incorrect:** * **Colon:** Colonic pathologies (like adenocarcinoma) typically cause microcytic anemia due to chronic occult blood loss (iron deficiency), not macrocytic anemia. * **Duodenum:** While B12 binds to R-binders in the stomach and is released by pancreatic enzymes in the duodenum, the primary pathology leading to chronic B12 deficiency and cancer risk is gastric, not duodenal. * **Esophagus:** Esophageal cancer is associated with smoking, alcohol, and GERD (Barrett’s), but it does not physiologically interfere with B12 absorption or Intrinsic Factor production. **NEET-PG High-Yield Pearls:** * **Site of Absorption:** Vitamin B12 is absorbed in the **Terminal Ileum**. * **Schilling Test:** Historically used to differentiate between IF deficiency (Stomach), bacterial overgrowth, or ileal disease. * **Blood Film:** Look for **Hypersegmented Neutrophils** (earliest sign) and Megaloblasts. * **Associations:** Pernicious anemia is often associated with other autoimmune conditions like Vitiligo, Hashimoto’s thyroiditis, and Type 1 Diabetes.

Q: Which of the following statements about Mallory Weiss Syndrome is true?

Shows a mucosal tear. **Explanation:** **Mallory-Weiss Syndrome (MWS)** is characterized by **longitudinal mucosal lacerations** (tears) at the gastroesophageal junction or the distal esophagus. These tears are typically caused by a sudden increase in intra-abdominal pressure, most commonly due to forceful vomiting, retching, or coughing. * **Why Option D is Correct:** The hallmark of MWS is a **non-transmural, mucosal tear**. It involves only the mucosa and submucosa, unlike Boerhaave syndrome, which involves the entire wall thickness. * **Why Option A is Incorrect:** MWS presents with **hematemesis** (vomiting blood), not hemoptysis (coughing up blood from the respiratory tract). * **Why Option B is Incorrect:** Transmural rupture is the defining feature of **Boerhaave Syndrome**, a much more severe and life-threatening condition. * **Why Option C is Incorrect:** Chest pain and shortness of breath are classic signs of Boerhaave Syndrome (due to mediastinitis and pleural effusion). MWS is typically **painless** or associated with only mild epigastric discomfort. **High-Yield Clinical Pearls for NEET-PG:** * **Classic History:** An alcoholic patient or a pregnant woman (hyperemesis gravidarum) presenting with episodes of non-bloody vomiting followed by sudden hematemesis. * **Diagnosis:** **Upper GI Endoscopy** is the gold standard; it reveals linear mucosal lacerations, often with an adherent clot. * **Management:** Most cases (approx. 90%) stop bleeding spontaneously and require only supportive care (PPIs, fluid resuscitation). Active bleeding is managed endoscopically with epinephrine injection or clipping. * **Location:** Most commonly located just below the Z-line on the gastric side of the gastroesophageal junction.

Q: A 25-year-old patient complains of crushing chest discomfort for 45 minutes with no significant medical history. The ECG is normal. His chest pain improved with sublingual nitroglycerin. What is the most likely diagnosis?

Diffuse esophageal spasm. ### Explanation The correct answer is **Diffuse Esophageal Spasm (DES)**. **1. Why it is correct:** Diffuse Esophageal Spasm is a motility disorder characterized by uncoordinated, non-peristaltic contractions of the esophagus [1]. It classically presents as **intermittent, crushing retrosternal chest pain** that can mimic angina pectoris [1]. A key diagnostic "trap" in NEET-PG is the response to **Nitroglycerin**. Nitrates (and Calcium Channel Blockers) relax smooth muscles in both the coronary arteries and the esophagus; therefore, relief of pain with nitroglycerin does *not* exclusively confirm a cardiac origin [1]. In this case, the **normal ECG** and the patient’s **young age** (25 years) with no risk factors make a cardiac event less likely, pointing toward DES [2]. **2. Why the other options are incorrect:** * **Myocardial Infarction:** While the pain description is similar, a 45-minute episode of MI would typically show ischemic changes (ST-segment or T-wave abnormalities) on an ECG [4]. * **Anxiety Attack:** While it can cause chest tightness, it is usually associated with hyperventilation, palpitations, and tremors, and would not specifically be relieved by sublingual nitrates [3]. * **Scleroderma:** Esophageal involvement in scleroderma (CREST syndrome) typically presents with **dysphagia** and severe **GERD** due to an aperistaltic esophagus and a *hypotensive* (weak) Lower Esophageal Sphincter (LES), rather than acute crushing pain [1]. **3. Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Manometry (shows high-amplitude, non-peristaltic "simultaneous" contractions). * **Barium Swallow Finding:** Classically described as a **"Corkscrew esophagus"** or "Rosary bead esophagus." * **First-line Treatment:** Nitrates or Calcium Channel Blockers (Diltiazem) [1]. * **Differential:** Always rule out GERD, as it is the most common cause of non-cardiac chest pain.

Q: The hydrogen breath test is used for which of the following conditions?

Lactose intolerance. ### Explanation **1. Why Lactose Intolerance is Correct:** The Hydrogen Breath Test (HBT) is the non-invasive gold standard for diagnosing carbohydrate malabsorption, most commonly **Lactose Intolerance**. [1] * **Mechanism:** In individuals with lactase deficiency, undigested lactose reaches the colon. Colonic bacteria ferment this lactose, producing **hydrogen (H₂) gas**. [1], [2] This gas is absorbed into the bloodstream and exhaled via the lungs. * **Diagnostic Criteria:** A rise in breath hydrogen levels **>20 ppm** (parts per million) over the baseline after oral lactose ingestion confirms malabsorption. [1] **2. Why the Other Options are Incorrect:** * **B. GERD:** Diagnosed clinically or via **24-hour ambulatory pH monitoring** (gold standard) and upper GI endoscopy to check for complications like Esophagitis or Barrett’s esophagus. * **C. Helicobacter pylori:** The specific breath test for *H. pylori* is the **Urea Breath Test (UBT)**, which measures labeled **CO₂**, not hydrogen. It relies on the organism's urease activity. * **D. Irritable Bowel Syndrome (IBS):** This is a functional disorder diagnosed using the **Rome IV Criteria**. While HBT may be used to rule out Small Intestinal Bacterial Overgrowth (SIBO) as a mimic, it is not the diagnostic test for IBS itself. **3. NEET-PG Clinical Pearls:** * **SIBO Diagnosis:** HBT using **Glucose** or **Lactulose** is also used to diagnose Small Intestinal Bacterial Overgrowth (an early peak in hydrogen indicates bacteria in the proximal small bowel). * **False Negatives:** Can occur in

Question 1

Small bowel vascular ectasia is associated with:

Accepted Answer

Chronic renal failure

Answer

Retroviral infection

Answer

Amyloidosis

Answer

Watermelon stomach

Question 2

A 65-year-old patient with coronary artery disease was on Aspirin for 2 years. He now complains of black stools. Abdominal examination is normal. What is the most probable diagnosis?

Accepted Answer

Duodenal ulcer

Answer

Ileocecal TB

Answer

Carcinoma of colon

Answer

Esophageal varices

Question 3

A patient develops a persistent macrocytic anemia. Serum folate levels are normal, but serum vitamin B12 levels are low. Oral vitamin absorption studies demonstrate that the patient is unable to absorb vitamin B12 in adequate amounts. Cancer of which of the following organs is most strongly associated with this patient's condition?

Accepted Answer

Stomach

Answer

Colon

Answer

Duodenum

Answer

Esophagus

Question 4

Which of the following statements about Mallory Weiss Syndrome is true?

Accepted Answer

Shows a mucosal tear

Answer

Presents with hemoptysis

Answer

Shows transmural rupture

Answer

Associated with chest pain and shortness of breath

Question 5

A 52-year-old man presented with acute upper gastrointestinal bleeding. An abdominal ultrasound was normal. Gastroscopy identified an intermittent pulsatile stream of blood, with no underlying lesion visible between bleeding episodes. What is the likely diagnosis?

Accepted Answer

Dieulafoy's lesion

Answer

Prolapsed gastropathy

Answer

"Water-melon" stomach

Answer

Gastric antral vascular ectasia

Question 6

NCPF is due to which of the following conditions?

Accepted Answer

Intrahepatic presinusoidal obstruction

Answer

Extrahepatic obstruction

Answer

Intrahepatic sinusoidal obstruction

Answer

Intrahepatic postsinusoidal obstruction

Question 7

A 50-year-old woman complains of weakness, profuse watery diarrhea, and crampy abdominal pain. She reports a 10-lb weight loss. Her serum potassium is 2.8 mEq/L. What is the most likely diagnosis?

Accepted Answer

Watery diarrhea, hypokalemia, and achlorhydria (WDHA) syndrome

Answer

Somatostatinoma

Answer

Glucagonoma

Answer

Insulinoma

Question 8

A 25-year-old patient complains of crushing chest discomfort for 45 minutes with no significant medical history. The ECG is normal. His chest pain improved with sublingual nitroglycerin. What is the most likely diagnosis?

Accepted Answer

Diffuse esophageal spasm

Answer

Myocardial infarction

Answer

Anxiety attack

Answer

Scleroderma

Question 9

What is the drug of choice for Wilson's disease with hepatic compensation?

Accepted Answer

Zinc and Trientine

Answer

Zinc

Answer

Thiomolybdate

Answer

Penicillamine

Question 10

The hydrogen breath test is used for which of the following conditions?

Accepted Answer

Lactose intolerance

Answer

Gastroesophageal reflux disease (GERD)

Answer

Helicobacter pylori infection

Answer

Irritable bowel syndrome

Gastroenterology — MCQs

Gastroenterology — MCQs

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