Gastroenterology Practice Questions

Q: A 36-year-old man is diagnosed with a duodenal ulcer after undergoing upper endoscopy. Which of the following is the most common symptom of duodenal ulcer?

epigastric pain. **Explanation:** **1. Why Epigastric Pain is the Correct Answer:** Epigastric pain is the hallmark and most common presenting symptom of Peptic Ulcer Disease (PUD), including duodenal ulcers (DU). The pain is typically described as a burning or "gnawing" sensation in the epigastrium. In duodenal ulcers, the pain classically occurs **2–3 hours after a meal** or at night (nocturnal pain), often waking the patient. This occurs because food buffers the acid initially, but as the stomach empties, the acid enters the duodenum and irritates the ulcer base. Crucially, the pain in DU is typically **relieved by food or antacids.** **2. Why the Other Options are Incorrect:** * **B. Nausea:** While nausea and vomiting can occur in PUD, they are less common than pain. If persistent, they may suggest a complication like gastric outlet obstruction. * **C. Melena:** This is a sign of an upper gastrointestinal bleed. While DU is the most common cause of GI bleeding, melena is a **complication**, not the most common presenting symptom. * **D. Anorexia:** Anorexia and weight loss are more characteristic of **gastric ulcers** (where eating triggers pain, leading to "food fear") or gastric malignancy. Patients with duodenal ulcers often maintain their weight or even gain weight because eating relieves their symptoms. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** The first part of the duodenum (95% occur within 2 cm of the pylorus). * **H. pylori:** The most common cause of DU (associated with >90% of cases). * **Pain-Food-Relief Sequence:** This is the classic clinical triad for Duodenal Ulcer. * **Complications:** Hemorrhage is the most common complication; Perforation is the second most common (usually involves the anterior wall). * **Investigation of Choice:** Upper GI Endoscopy (UGIE).

Q: A 41-year-old patient is diagnosed with infective endocarditis. Which of the following has a good prognosis?

Streptococcus viridans endocarditis. Infective Endocarditis (IE) prognosis is determined by the virulence of the organism, the type of valve involved, and the presence of complications. **Why Streptococcus viridans is the correct answer:** *Streptococcus viridans* (e.g., *S. mitis*, *S. sanguinis*) is a low-virulence organism that typically causes **subacute infective endocarditis** [1]. It usually affects previously damaged native valves and follows a slow, indolent course. Because it is highly sensitive to Penicillin and rarely causes rapid valvular destruction or embolic phenomena compared to other pathogens, it carries the **best prognosis** among the options provided. **Analysis of Incorrect Options:** * **Prosthetic Valve Endocarditis (PVE):** This carries a high mortality rate (especially early PVE) due to the risk of ring abscesses, valve dehiscence, and the difficulty of eradicating biofilms on foreign material. * **Intravenous Drug Abuse (IVDA):** While right-sided IE (common in IVDA) often has a better prognosis than left-sided IE, these patients frequently present with *S. aureus* or polymicrobial infections and have high rates of recurrence and septic pulmonary emboli [1]. * **Staphylococcus aureus:** This is a highly virulent organism causing **acute infective endocarditis** [1]. It leads to rapid valvular destruction, high fever, and frequent systemic embolic complications, resulting in a poor prognosis [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of IE overall:** *Staphylococcus aureus* (now surpassing *S. viridans*) [1]. * **Most common cause of IE in IVDA:** *Staphylococcus aureus* (Tricuspid valve) [1]. * **Culture-negative IE:** Most commonly due to prior antibiotic use; otherwise, consider **HACEK** organisms or *Coxiella burnetii*. * **Duke’s Criteria:** The gold standard for diagnosis (requires 2 major, 1 major + 3 minor, or 5 minor criteria) [3].

Q: Which antibodies are associated with autoimmune hepatitis type IIa?

Anti LKM antibody. **Explanation:** Autoimmune Hepatitis (AIH) is a chronic inflammatory liver disease classified into two main types based on the presence of specific circulating autoantibodies. **Correct Option (D): Anti-LKM antibody** Type II Autoimmune Hepatitis is characterized by the presence of **Anti-Liver Kidney Microsomal type 1 (Anti-LKM1)** antibodies. It typically affects children and adolescents (often girls) and tends to have a more aggressive clinical course than Type I. The specific target antigen for Anti-LKM1 is the cytochrome P450 2D6 (CYP2D6) enzyme. **Analysis of Incorrect Options:** * **A. ANA (Antinuclear Antibody):** This is the hallmark of **Type I AIH**, which is the most common form worldwide and usually affects young to middle-aged women. It is also associated with Anti-Smooth Muscle Antibodies (ASMA). * **B. p-ANCA:** While p-ANCA can be positive in Type I AIH, it is more classically associated with **Primary Sclerosing Cholangitis (PSC)** and Ulcerative Colitis. * **C. Anti-histone antibody:** This is the classic marker for **Drug-Induced Lupus Erythematosus (DILE)**, not autoimmune hepatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Type I AIH:** ANA positive, ASMA (Anti-Smooth Muscle Antibody) positive, Anti-SLA/LP positive. Affects adults. * **Type II AIH:** Anti-LKM1 positive, Anti-LC1 (Liver Cytosol type 1) positive. Affects children. * **Treatment:** Both types respond well to corticosteroids (Prednisolone) and Azathioprine. * **Histology:** Look for **"Interface Hepatitis"** (piecemeal necrosis) and a dense infiltrate of **plasma cells** in the portal tracts.

Q: In which of the following conditions does odynophagia occur?

Herpes esophagitis and Monilial esophagitis. The key to answering this question lies in distinguishing between **dysphagia** (difficulty swallowing) and **odynophagia** (painful swallowing) [1]. **1. Why Option B is Correct:** Odynophagia is a hallmark symptom of **infectious esophagitis**, which causes acute mucosal inflammation and ulceration. * **Monilial (Candidal) esophagitis:** The most common cause of infectious esophagitis, typically seen in immunocompromised patients (HIV/AIDS, malignancy). It presents with white plaques and significant pain on swallowing. * **Herpes esophagitis:** Caused by HSV-1, it leads to "punched-out" ulcers. The raw, ulcerated surface of the esophagus makes the passage of food extremely painful. **2. Why Other Options are Incorrect:** * **Achalasia Cardia:** This is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax [1]. Its primary symptom is **painless dysphagia** for both solids and liquids. While patients may experience chest pain, true odynophagia is not a standard feature [1], [2]. * **Barrett’s Esophagus:** This is a premalignant metaplastic change of the esophageal lining due to chronic GERD [3]. It is usually asymptomatic or presents with symptoms of reflux (heartburn). It does not cause odynophagia unless a deep peptic ulcer or adenocarcinoma develops [1], [3]. **3. NEET-PG High-Yield Pearls:** * **Odynophagia = Mucosal Injury:** Always think of infections (Candida, HSV, CMV), pill-induced esophagitis, or caustic ingestion. * **Dysphagia = Structural/Motility Issue:** Think of Achalasia, Strictures, or Malignancy [1], [2]. * **Drug of Choice:** Fluconazole for Monilial esophagitis; Acyclovir for Herpes esophagitis. * **Endoscopy Finding:** "Cottage cheese" appearance for Candida; "Volcano-like" ulcers for HSV.

Q: Which of the following is NOT a predisposing factor for hepatic encephalopathy?

Metabolic acidosis. Hepatic Encephalopathy (HE) is primarily driven by the accumulation of neurotoxins, most notably ammonia ($NH_3$), which crosses the blood-brain barrier [1]. The correct answer is Metabolic Acidosis because it is actually Metabolic Alkalosis that predisposes a patient to HE. Why Metabolic Acidosis is the correct answer: In an acidic environment, ammonia ($NH_3$) reacts with hydrogen ions to form ammonium ($NH_4^+$). Unlike $NH_3$, $NH_4^+$ is charged and cannot easily cross the blood-brain barrier. Therefore, acidosis is generally protective. Conversely, Metabolic Alkalosis shifts the equilibrium toward $NH_3$, facilitating its entry into the brain and worsening encephalopathy. Analysis of Incorrect Options: * Gastrointestinal Bleeding: This is a classic precipitant. Blood in the GI tract provides a massive protein load (hemoglobin), which is broken down by gut bacteria into ammonia. * Hypokalemia: Low potassium levels lead to an intracellular shift of $H^+$ ions, causing extracellular alkalosis. It also stimulates renal ammoniagenesis in the proximal tubules, significantly increasing systemic ammonia levels. * Alcohol: Alcohol acts as a direct CNS depressant and can trigger acute alcoholic hepatitis, further impairing the liver's ability to detoxify ammonia via the urea cycle. High-Yield Clinical Pearls for NEET-PG: * Most common precipitant: Infection (e.g., SBP) and GI bleeding. * Azotemia: Renal failure increases urea levels, which gut bacteria convert into ammonia. * Treatment Logic: Lactulose works by acidifying the gut (converting $NH_3$ to $NH_4^+$) and acting as an osmotic laxative. Rifaximin is added to reduce ammonia-producing gut flora. * Asterixis: The hallmark physical finding (negative myoclonus), though not pathognomonic for HE [2].

Q: Anti-LKM antibody is seen in which condition?

Autoimmune hepatitis type II. **Explanation:** **Autoimmune Hepatitis (AIH)** is a chronic inflammatory liver disease characterized by the presence of specific autoantibodies [1]. It is classified into two main types based on the serological profile: * **Type I AIH:** The most common form, characterized by **Anti-Nuclear Antibody (ANA)** and/or **Anti-Smooth Muscle Antibody (ASMA)**. * **Type II AIH:** Typically affects children and adolescents. It is characterized by the presence of **Anti-Liver Kidney Microsomal type 1 (Anti-LKM1) antibodies**. The target antigen for Anti-LKM1 is the enzyme **Cytochrome P450 2D6 (CYP2D6)**. **Analysis of Incorrect Options:** * **Hepatitis A:** This is an acute viral infection diagnosed by IgM anti-HAV. It does not involve autoantibodies. * **Hepatitis C:** While chronic HCV can sometimes trigger the production of low-titer Anti-LKM1 antibodies (molecular mimicry), the primary diagnostic markers are Anti-HCV and HCV-RNA. Anti-LKM1 is the *hallmark* diagnostic feature for AIH Type II, not Hepatitis C. * **Hepatitis D:** This is a co-infection or superinfection with Hepatitis B. Diagnosis relies on HDV-Ag or HDV-RNA. **High-Yield Clinical Pearls for NEET-PG:** * **AIH Type I:** Associated with HLA-DR3 or DR4 [1]. * **AIH Type II:** More common in females; often presents with more severe progression to cirrhosis compared to Type I. * **Anti-LKM2:** Associated with drug-induced hepatitis (e.g., Ticrynafen). * **Anti-LKM3:** Associated with Hepatitis D (Delta) infection. * **Treatment:** The mainstay of treatment for AIH is corticosteroids (Prednisolone) and Azathioprine [1].

Q: What is the first line of treatment for severe ascites?

Therapeutic paracentesis. The management of ascites is graded based on severity. **Therapeutic Paracentesis (Large Volume Paracentesis - LVP)** is the first-line treatment for **Grade 3 (Severe/Tense) ascites**. This is because LVP provides rapid symptomatic relief from abdominal pressure and respiratory distress more effectively and faster than diuretics. When performing LVP, if more than 5 liters are removed, albumin replacement (6–8 g per liter of fluid removed) is mandatory to prevent post-paracentesis circulatory dysfunction. [1] **Analysis of Incorrect Options:** * **A. Bed rest and salt restriction:** While salt restriction (<2g/day) is the cornerstone for Grade 1 and 2 ascites, it is insufficient as a primary treatment for severe, tense ascites. Bed rest is no longer routinely recommended as it does not significantly improve diuresis and may cause pressure sores. * **C. Shunt placement (TIPS):** Transjugular Intrahepatic Portosystemic Shunt is a second-line intervention reserved for **refractory ascites** [2] (ascites that cannot be managed by medical therapy or recurs rapidly after LVP). * **D. Diuretics:** Diuretics (Spironolactone and Furosemide) are the mainstay for **Grade 2 (Moderate) ascites**. In severe ascites, they are used for maintenance therapy *after* the initial volume has been reduced by paracentesis. **High-Yield Clinical Pearls for NEET-PG:** * **SAAG Score:** The most important initial test. SAAG ≥1.1 g/dL indicates portal hypertension (e.g., Cirrhosis, CHF). [1] * **Spontaneous Bacterial Peritonitis (SBP):** Diagnosed when PMN count in ascitic fluid is **>250 cells/mm³**. * **Diuretic Ratio:** The classic starting ratio is **100mg Spironolactone : 40mg Furosemide** to maintain potassium balance. * **Refractory Ascites:** Defined by lack of response to high-dose diuretics (400mg Spironolactone + 160mg Furosemide) or rapid recurrence after LVP.

Q: A patient presents with a history of mild diarrhea, blood in stools, and multiple fistulas. What is the most probable diagnosis?

Crohn's disease. ### Explanation The clinical presentation of chronic diarrhea, hematochezia, and **multiple fistulas** is a classic hallmark of **Crohn’s Disease** [1]. **1. Why Crohn’s Disease is Correct:** Crohn’s disease is a chronic inflammatory bowel disease (IBD) characterized by **transmural inflammation** (involving all layers of the bowel wall). This deep inflammation leads to the formation of sinus tracts that penetrate through the serosa into adjacent organs or the skin, resulting in **fistulas** (perianal, entero-enteric, or entero-vesical) [1]. While blood in stools is more common in Ulcerative Colitis, it frequently occurs in Crohn’s when the colon is involved [1]. **2. Why Other Options are Incorrect:** * **Ulcerative Colitis:** Inflammation is limited to the **mucosa and submucosa**. Because it does not involve the full thickness of the wall, fistula formation is extremely rare [1]. * **Intestinal Tuberculosis:** While it can mimic Crohn’s (especially the ileocecal involvement), it typically presents with constitutional symptoms like night sweats and fever. While fistulas can occur, they are significantly less common than in Crohn’s. * **Typhoid:** This is an acute febrile illness presenting with "pea-soup" diarrhea, rose spots, and potential intestinal perforation, but it does not cause chronic fistula formation. **3. NEET-PG High-Yield Pearls:** * **Pathology:** Look for **"Skip lesions"** and **non-caseating granulomas** (seen in 40-60% of cases). * **Endoscopy:** Characterized by a **"Cobblestone appearance"** [1] and "Creeping fat" (mesenteric fat wrapping around the bowel). * **Radiology:** The **"String sign of Kantor"** (terminal ileum narrowing) is a classic finding on barium studies [1]. * **Smoking:** Smoking is a risk factor for Crohn’s disease but is protective against Ulcerative Colitis.

Q: Oral examination is indicated in which of the following conditions?

Peutz-Jeghers syndrome. Oral examination is a critical diagnostic step in identifying **Peutz-Jeghers Syndrome (PJS)**. PJS is an autosomal dominant disorder characterized by the mutation of the **STK11 (LKB1)** gene. It is clinically defined by the triad of mucocutaneous pigmentation, gastrointestinal hamartomatous polyps [1], and an increased risk of visceral malignancies. 1. **Why Peutz-Jeghers Syndrome is correct:** The hallmark clinical sign is **melanotic macules** (hyperpigmented spots) found on the lips, buccal mucosa, and perioral area. These spots are often the first clue to diagnosis, appearing in childhood and sometimes fading after puberty, though buccal mucosa lesions usually persist. 2. **Why other options are incorrect:** * **Psoriasis:** Primarily a skin condition (extensor surfaces) and nail disorder; while oral psoriasis exists, it is extremely rare and not a standard indication for oral screening. * **Beri-beri:** Caused by Thiamine (B1) deficiency, it presents with cardiovascular (Wet) or neurological (Dry) symptoms. Oral signs are not characteristic (unlike B2 or B3 deficiencies). * **Plummer-Vinson Syndrome:** While it involves the oral cavity (glossitis), the definitive diagnostic step is an **esophagoscopy or barium swallow** to identify esophageal webs, rather than a simple oral inspection for diagnosis. **NEET-PG High-Yield Pearls:** * **PJS Polyps:** These are **hamartomatous**, most commonly found in the **small intestine** (jejunum) [1]. * **Complications:** The most common complication is **intussusception**. * **Cancer Risk:** Patients have a significantly high lifetime risk of colorectal, pancreatic, breast, and ovarian cancers [1]. * **Mnemonic:** "P" for Pigmentation, "P" for Polyps, "P" for STK11 (on chromosome 19**p**).

Q: Which of the following is not a marker of the active replicative phase of chronic hepatitis B?

Anti-HBc. ### Explanation The active replicative phase of Chronic Hepatitis B is characterized by high viral load, active viral assembly, and ongoing liver injury. To identify this phase, we look for markers of the virus itself or the damage it causes. [1] **Why Anti-HBc is the Correct Answer:** **Anti-HBc (Antibody to Hepatitis B core antigen)** is a marker of **exposure**, not replication. [2] * **IgM anti-HBc** indicates acute infection or a flare. * **IgG anti-HBc** indicates past or chronic infection and persists for life. [2] Because it remains positive regardless of whether the virus is actively replicating or in a dormant (inactive carrier) state, it is not a specific marker for the replicative phase. **Analysis of Incorrect Options:** * **HBV DNA:** This is the most sensitive and quantitative marker of viral replication. High levels (>2,000 IU/mL) signify active replication. [1] * **HBV DNA Polymerase:** This enzyme is required for viral synthesis. Its presence directly correlates with the production of new viral particles. * **AST & ALT:** These aminotransferases are markers of hepatocellular injury. In the replicative phase (specifically the "Immune Clearance" phase), the immune system attacks infected hepatocytes, leading to elevated AST and ALT. **NEET-PG High-Yield Pearls:** 1. **HBeAg:** The classic serological marker for high infectivity and active replication. 2. **Window Period:** The interval where HBsAg and Anti-HBs are both negative; **IgM Anti-HBc** is the only positive marker here. [1] 3. **Inactive Carrier State:** Characterized by HBeAg negative, Anti-HBe positive, low HBV DNA (<2,000 IU/mL), and normal ALT. [2] 4. **Ground Glass Hepatocytes:** Histological hallmark of chronic HBV infection due to HBsAg accumulation in the endoplasmic reticulum.

Question 1

A 36-year-old man is diagnosed with a duodenal ulcer after undergoing upper endoscopy. Which of the following is the most common symptom of duodenal ulcer?

Accepted Answer

epigastric pain

Answer

nausea

Answer

melena

Answer

anorexia

Question 2

A 41-year-old patient is diagnosed with infective endocarditis. Which of the following has a good prognosis?

Accepted Answer

Streptococcus viridans endocarditis

Answer

Prosthetic valve endocarditis

Answer

Intravenous drug abuse

Answer

Staphylococcus aureus endocarditis

Question 3

Which antibodies are associated with autoimmune hepatitis type IIa?

Accepted Answer

Anti LKM antibody

Answer

ANA antibody

Answer

p ANCA

Answer

Anti histone antibody

Question 4

In which of the following conditions does odynophagia occur?

Accepted Answer

Herpes esophagitis and Monilial esophagitis

Answer

Achalasia and Herpes esophagitis

Answer

Achalasia, Herpes esophagitis, and Monilial esophagitis

Answer

Achalasia, Herpes esophagitis, Monilial esophagitis, and Barrett's esophagus

Question 5

Which of the following is NOT a predisposing factor for hepatic encephalopathy?

Accepted Answer

Metabolic acidosis

Answer

Gastrointestinal bleeding

Answer

Hypokalemia

Answer

Alcohol

Question 6

Anti-LKM antibody is seen in which condition?

Accepted Answer

Autoimmune hepatitis type II

Answer

Hepatitis A

Answer

Hepatitis C

Answer

Hepatitis D

Question 7

What is the first line of treatment for severe ascites?

Accepted Answer

Therapeutic paracentesis

Answer

Bed rest and salt restriction

Answer

Shunt placement

Answer

Diuretics

Question 8

A patient presents with a history of mild diarrhea, blood in stools, and multiple fistulas. What is the most probable diagnosis?

Accepted Answer

Crohn's disease

Answer

Intestinal tuberculosis

Answer

Ulcerative colitis

Answer

Typhoid

Question 9

Oral examination is indicated in which of the following conditions?

Accepted Answer

Peutz-Jeghers syndrome

Answer

Psoriasis

Answer

Beri-beri

Answer

Plummer-Vinson syndrome

Question 10

Which of the following is not a marker of the active replicative phase of chronic hepatitis B?

Accepted Answer

Anti-HBc

Answer

HBV DNA

Answer

HBV DNA polymerase

Answer

AST & ALT

Gastroenterology — MCQs

Gastroenterology — MCQs

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