Gastroenterology Practice Questions

Q: Intermittent dysphagia is caused by which of the following conditions?

Achalasia cardia and Diffuse esophageal spasm. ### Explanation The key to answering dysphagia questions lies in distinguishing between **mechanical obstruction** and **motility disorders**. **1. Why Option C is Correct:** Both **Achalasia cardia** and **Diffuse Esophageal Spasm (DES)** are primary esophageal motility disorders. [3] * **Achalasia cardia:** Characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and aperistalsis. [1] While it often presents with progressive dysphagia, the symptoms can be **intermittent** in the early stages and characteristically involve both **solids and liquids** from the onset. [4] * **Diffuse Esophageal Spasm (DES):** Presents with classic **intermittent** dysphagia and non-cardiac chest pain. [2] The symptoms are episodic because the uncoordinated "corkscrew" contractions occur sporadically. **2. Why Other Options are Incorrect:** * **Strictures and Reflux Esophagitis (Options A & B):** These are mechanical/structural issues. Dysphagia due to a peptic stricture is typically **progressive** (starting with solids and later involving liquids) rather than intermittent. [3] * **Pharyngeal (Zenker’s) Diverticulum (Options B & D):** This is a structural outpouching. While it can cause gurgling and regurgitation [1], the dysphagia is usually constant or progressive as the sac enlarges and compresses the esophagus. **3. NEET-PG High-Yield Pearls:** * **Solids only dysphagia:** Suggests mechanical obstruction (e.g., Schatzi ring, Carcinoma, Stricture). [3] * **Solids + Liquids dysphagia (from start):** Suggests a motility disorder (Achalasia, DES, Scleroderma). * **Intermittent + Solids only:** Classic for **Schatzki Ring**. * **Intermittent + Solids/Liquids + Chest pain:** Classic for **Diffuse Esophageal Spasm**. [2] * **Progressive + Weight loss + Elderly:** Highly suspicious of **Esophageal Carcinoma**.

Q: A patient presents with serum bilirubin values of >40mg% and obstructive jaundice. What does this indicate?

Concomitant renal failure. ### Explanation In clinical practice, serum bilirubin levels rarely exceed **20–30 mg/dL**, even in cases of complete biliary obstruction. This is because, at these high levels, the kidneys begin to excrete conjugated bilirubin efficiently, creating a "plateau" effect where the rate of excretion matches the rate of production. **1. Why "Concomitant Renal Failure" is correct:** When a patient presents with extreme hyperbilirubinemia (**>40 mg/dL**), it indicates that the secondary clearance mechanism—the kidneys—is failing. The inability of the kidneys to filter conjugated bilirubin leads to a rapid accumulation in the blood. This scenario is often seen in conditions like **hepatorenal syndrome** or severe sepsis with multi-organ dysfunction. **2. Why the other options are incorrect:** * **Carcinoma of the gallbladder & Complete obstruction of the bile duct:** While these cause obstructive jaundice, the bilirubin levels typically peak between 15–30 mg/dL. Without renal impairment, the body maintains an equilibrium that prevents levels from reaching 40 mg/dL. * **Acute cholecystitis:** This typically presents with minimal or no jaundice unless there is associated Mirizzi syndrome or a common bile duct stone. Bilirubin levels are usually 40–50 mg/dL are most commonly associated with **renal insufficiency**, **severe hemolysis** (e.g., G6PD deficiency with hepatitis), or **fulminant hepatic failure**. * **Courvoisier’s Law:** In a patient with obstructive jaundice, a palpable gallbladder is usually due to malignancy (e.g., Periampullary Ca) rather than stones, as stones cause a fibrosed, non-distensible gallbladder.

Q: Post-hepatic portal hypertension is caused by?

Budd-Chiari Syndrome. Detailed explanation of portal hypertension classification: **Pre-hepatic, Intra-hepatic, and Post-hepatic.** **1. Why Budd-Chiari Syndrome is Correct:** Budd-Chiari Syndrome (BCS) is defined by the obstruction of hepatic venous outflow, occurring anywhere from the small hepatic veins to the junction of the inferior vena cava (IVC) and the right atrium [2]. Because the obstruction occurs **after** the blood has passed through the liver parenchyma, it is the classic example of **Post-hepatic portal hypertension**. Clinical features typically include the triad of abdominal pain, ascites, and hepatomegaly. **2. Analysis of Incorrect Options:** * **Portal Vein Thrombosis (Option A):** This occurs before the blood enters the liver and is a recognised cause of non-cirrhotic portal hypertension. Therefore, it is a **Pre-hepatic** cause [1]. * **Banti Syndrome (Option B):** Also known as Non-Cirrhotic Portal Fibrosis (NCPF), this involves obliterative portal venopathy. It is classified as **Pre-hepatic** or **Pre-sinusoidal intra-hepatic**. * **Congenital Hepatic Fibrosis (Option D):** This involves architectural changes within the liver tissue itself. It is an **Intra-hepatic (Pre-sinusoidal)** cause. **3. NEET-PG High-Yield Pearls:** * **Most common cause of Portal HTN in India:** Cirrhosis (Intra-hepatic). * **Most common cause of Variceal Bleed in children:** Extra-hepatic Portal Vein Obstruction (EHPVO). * **Post-hepatic causes to remember:** Budd-Chiari Syndrome, IVC webs, Constrictive Pericarditis, and Right-sided Heart Failure [3]. * **Schistosomiasis:** The most common cause of Pre-sinusoidal portal hypertension worldwide.

Q: All are advantages of Zinc therapy for Wilson disease, except:

Produces positive copper balance.. **Explanation:** In Wilson disease, the primary goal of therapy is to achieve a **negative copper balance** to prevent toxic accumulation in the liver and brain [1]. **Why Option B is the Correct Answer:** Zinc therapy induces the synthesis of **metallothionein** in the intestinal mucosa. Metallothionein has a high affinity for copper; it binds dietary copper and prevents its entry into the portal circulation. The bound copper is then excreted in the feces when enterocytes are sloughed. By blocking absorption and increasing fecal excretion, Zinc produces a **negative copper balance**, not a positive one. A positive balance would imply copper accumulation, which is the underlying pathology of the disease. **Analysis of Incorrect Options:** * **Option A (Nontoxic):** Zinc is generally considered the least toxic therapy for Wilson disease. Unlike chelators (like Penicillamine), it does not carry the risk of initial neurological worsening or severe hypersensitivity reactions. * **Option C (Blocks intestinal absorption):** This is the primary mechanism of action. Zinc competes with copper for uptake and sequesters it within the gut cells. * **Option D (Induces hepatic metallothionein):** While its main effect is in the gut, Zinc also induces metallothionein in the liver, which serves to sequester free (toxic) copper into a non-toxic storage form [2]. **Clinical Pearls for NEET-PG:** * **Drug of Choice:** Zinc is the preferred maintenance therapy and the treatment of choice for asymptomatic patients or pregnant women. * **Chelation:** Penicillamine or Trientine are used for symptomatic/initial decoppering. * **Monitoring:** Effectiveness is monitored via 24-hour urinary copper excretion (which should decrease) and non-ceruloplasmin bound copper levels [2]. * **Side Effect:** The most common side effect of Zinc is gastric irritation.

Q: A patient with Barrett's esophagus underwent chromoendoscopy. What dye is used in this patient for cancer detection?

Methylene blue. **Explanation:** **Methylene blue** is the correct answer because it is an **absorptive (vital) stain** specifically used in the surveillance of Barrett’s esophagus (BE). It is selectively taken up by the cytoplasm of specialized intestinal metaplasia (SIM) and small intestinal cells, but it is **not** absorbed by normal squamous epithelium or non-specialized gastric mucosa. In the context of cancer detection, areas of high-grade dysplasia or early adenocarcinoma often show **decreased or absent staining** (void areas) compared to the surrounding stained metaplastic tissue, allowing for targeted biopsies. **Analysis of Incorrect Options:** * **Gentian violet:** Primarily used as a topical antiseptic and for marking skin during surgery; it is not a standard dye for gastrointestinal chromoendoscopy. * **Toluidine blue:** This is a basic dye that stains nuclei. It is frequently used to detect **squamous cell carcinoma** (especially in the oral cavity and esophagus) but is not the primary choice for detecting specialized intestinal metaplasia in Barrett’s. * **Hematoxylin and eosin (H&E):** This is a standard histological stain used by pathologists to examine tissue sections under a microscope; it is not used as a dye during a live endoscopic procedure (chromoendoscopy). **Clinical Pearls for NEET-PG:** * **Lugol’s Iodine:** Used to detect **Squamous Cell Carcinoma** (normal squamous cells contain glycogen and turn dark brown; cancerous cells are glycogen-poor and remain unstained). * **Indigo Carmine:** A **contrast stain** that does not get absorbed but highlights mucosal surface patterns (topography); used for detecting colorectal polyps. * **Acetic Acid:** Used in Barrett’s to highlight "acetowhitening," helping to distinguish between different types of metaplasia.

Question 1

In 24-hour ambulatory pH testing for the diagnosis of GERD, what percentage of the day should the pH be less than 4?

Accepted Answer

> 5%

Answer

> 20%

Answer

> 1%

Answer

> 1%

Question 2

Intermittent dysphagia is caused by which of the following conditions?

Accepted Answer

Achalasia cardia and Diffuse esophageal spasm

Answer

Stricture, Reflux esophagitis, and Achalasia cardia

Answer

Reflux esophagitis, Achalasia cardia, and Pharyngeal diverticulum

Answer

Pharyngeal diverticulum and Diffuse esophageal spasm

Question 3

Which of the following is FALSE about Mallory-Weiss syndrome?

Accepted Answer

Massive hemorrhage is the most common manifestation.

Answer

Alcohol is an associated etiology.

Answer

Conservative treatment is effective in most cases.

Answer

Anti-reflux procedures do not have an added advantage.

Question 4

Which of the following statements about achalasia cardiae is true?

Accepted Answer

There is a loss of ganglion cells within the esophageal myenteric plexus.

Answer

Achalasia is a common disorder.

Answer

Excess lower esophageal sphincter relaxation is the major pathology.

Answer

Latent infection with rubella virus is responsible for achalasia cardiae.

Question 5

A 23-year-old male college student has a history of liver cirrhosis due to an abnormality in copper metabolism. He should be treated with which of the following?

Accepted Answer

Penicillamine as soon as the diagnosis is established

Answer

Penicillamine after variceal bleeding has occurred

Answer

A portocaval shunt

Answer

Sclerosis of the esophageal varices as a prophylactic measure

Question 6

A patient presents with serum bilirubin values of >40mg% and obstructive jaundice. What does this indicate?

Accepted Answer

Concomitant renal failure

Answer

Carcinoma of the gallbladder

Answer

Acute cholecystitis

Answer

Complete obstruction of the bile duct

Question 7

Post-hepatic portal hypertension is caused by?

Accepted Answer

Budd-Chiari Syndrome

Answer

Portal vein thrombosis

Answer

Banti Syndrome

Answer

Congenital hepatic fibrosis

Question 8

All are advantages of Zinc therapy for Wilson disease, except:

Accepted Answer

Produces positive copper balance.

Answer

It is nontoxic.

Answer

Blocks intestinal absorption of copper.

Answer

Induces hepatic metallothionein synthesis.

Question 9

A patient with Barrett's esophagus underwent chromoendoscopy. What dye is used in this patient for cancer detection?

Accepted Answer

Methylene blue

Answer

Gentian violet

Answer

Toluidine blue

Answer

Hematoxylin and eosin

Question 10

A 70-year-old man presents with severe crampy abdominal pain which is worse after eating. The patient also complains of frequent nausea, bloating, watery diarrhea, and weight loss. His other medical problems include coronary artery disease, hypertension, and hypercholesterolemia. He has a 30-pack-year smoking history. A barium enema is shown. Which of the following statements is true?

Accepted Answer

Screening of the described condition can be done by duplex ultrasonography (pre and post-prandial).

Answer

Barium enema is suggestive of diverticulosis.

Answer

Contrast-enhanced MRI is the investigation of choice.

Answer

Treatment includes patient counseling, amitriptyline, NSAIDs, and steroids in severe conditions.

Gastroenterology — MCQs

Gastroenterology — MCQs

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