Gastroenterology Practice Questions

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

Q: Steroid refractory ulcerative colitis is defined as active disease despite treatment with which of the following regimens?

Prednisolone up to 0.75 mg/kg/day over 4 weeks. **Explanation:** In the management of Ulcerative Colitis (UC), defining steroid responsiveness is crucial for determining when to escalate to second-line therapies (like Infliximab or Cyclosporine). [1] **Steroid-refractory Ulcerative Colitis** is defined as the presence of active disease despite an adequate course of corticosteroids. According to standard clinical guidelines (including Harrison’s Principles of Internal Medicine and ECCO guidelines), this is specifically defined as: * **Prednisolone up to 0.75 mg/kg/day** (or equivalent) administered orally for a period of **4 weeks**. [1] * Alternatively, in acute severe cases, it refers to a lack of response to intravenous steroids (e.g., Hydrocortisone or Methylprednisolone) within 3–7 days. **Analysis of Options:** * **Option A (0.5 mg/kg):** This dose is considered sub-therapeutic for inducing remission in moderate-to-severe flares; therefore, failure at this dose does not meet the criteria for "refractory" disease. * **Option C & D (1 mg/kg or 1.5 mg/kg):** While 1 mg/kg is often used in clinical practice for various autoimmune conditions, the specific consensus definition for UC refractory status is pegged at the 0.75 mg/kg threshold to balance efficacy with the significant side-effect profile of higher doses. **High-Yield Clinical Pearls for NEET-PG:** * **Steroid-Dependent UC:** Disease that responds to steroids but relapses when the dose is tapered below 10 mg/day or within 3 months of stopping. * **First-line for Mild-Moderate UC:** Topical or oral 5-ASA (Mesalamine). [1] * **Indication for Surgery:** Toxic megacolon, perforation, or refractory disease. [1] * **Drug of Choice for Acute Severe UC (Steroid Refractory):** IV Cyclosporine or Infliximab ("Rescue therapy").

Q: What is the concentration of epinephrine used for injection therapy in the endoscopic management of actively bleeding peptic ulcers?

1 in 10,000. **Explanation:** The primary goal of endoscopic injection therapy in bleeding peptic ulcers is to achieve **hemostasis** through a combination of local vasoconstriction and mechanical tamponade. **Why 1:10,000 is the Correct Answer:** The standard concentration used globally is **1:10,000 (0.1 mg/mL)**. This concentration provides a potent vasoconstrictive effect on the bleeding vessel while minimizing systemic cardiovascular side effects. It is typically diluted in normal saline and injected in 0.5 mL to 2 mL aliquots around the ulcer base. The saline provides the volume necessary for **tamponade**, while the epinephrine induces local vasospasm and promotes platelet aggregation. **Analysis of Incorrect Options:** * **A (1:1,000):** This is the standard concentration for intramuscular injection in anaphylaxis. Using it endoscopically is dangerous as it can cause severe systemic absorption, leading to hypertensive crisis, arrhythmias, or myocardial ischemia. * **B (1:5,000):** While occasionally used in some surgical settings, it is considered too concentrated for routine endoscopic injection and increases the risk of local tissue necrosis and systemic toxicity. * **D (1:30,000):** This concentration is too dilute to provide effective local vasoconstriction required to stop active arterial spurting (Forrest Ia) or oozing (Forrest Ib). **High-Yield Clinical Pearls for NEET-PG:** * **Dual Therapy:** Epinephrine injection alone is less effective than "dual therapy." For high-risk ulcers, it should be combined with a second modality (e.g., thermal coagulation or mechanical clips) to prevent re-bleeding. * **Forrest Classification:** Injection therapy is indicated for **Forrest Ia (Spurting)**, **Ib (Oozing)**, and **IIa (Visible vessel)**. * **Volume:** Usually, 5–20 mL of the 1:10,000 solution is injected in total.

Question 1

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 2

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 3

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 4

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 5

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 6

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 7

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

Question 8

A chronic alcoholic presents with regurgitation and retrosternal pain. Endoscopic biopsy confirms Barrett's oesophagus. What is the most appropriate management in this case?

Accepted Answer

Endoscopic biopsy every 2 years

Answer

Proton pump inhibitor (PPI)

Answer

Helicobacter pylori treatment

Answer

Balloon dilatation

Question 9

Steroid refractory ulcerative colitis is defined as active disease despite treatment with which of the following regimens?

Accepted Answer

Prednisolone up to 0.75 mg/kg/day over 4 weeks

Answer

Prednisolone up to 0.5 mg/kg/day over 4 weeks

Answer

Prednisolone up to 1 mg/kg/day over 4 weeks

Answer

Prednisolone up to 1.5 mg/kg/day over 4 weeks

Question 10

What is the concentration of epinephrine used for injection therapy in the endoscopic management of actively bleeding peptic ulcers?

Accepted Answer

1 in 10,000

Answer

1 in 1000

Answer

1 in 5000

Answer

1 in 30,000

Gastroenterology — MCQs

Gastroenterology — MCQs

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