Gastroenterology Practice Questions

Q: Coomb's positive hemolytic anemia is seen in all of the following conditions except:

Alcoholic cirrhosis. The core concept tested here is the association between **Autoimmune Liver Diseases** and **Autoimmune Hemolytic Anemia (AIHA)**. [1] **1. Why Alcoholic Cirrhosis is the correct answer:** Hemolytic anemia in alcoholic cirrhosis is typically **Coombs-negative**. It is usually caused by **Zieve’s Syndrome** (triad of hemolytic anemia, hyperlipidemia, and jaundice) or **Spur Cell Anemia** (acanthocytosis due to abnormal cholesterol loading of the RBC membrane). These are metabolic and mechanical processes, not immune-mediated; hence, the Direct Antiglobulin Test (Coombs) is negative. **2. Why the other options are incorrect:** * **Chronic Active Hepatitis (Autoimmune Hepatitis):** AIH is frequently associated with other autoimmune phenomena. Coombs-positive AIHA is a well-documented extrahepatic manifestation of this condition. [1] * **Primary Biliary Cholangitis (PBC) & Primary Sclerosing Cholangitis (PSC):** Both are immune-mediated cholestatic liver diseases. [1] They are part of the "overlap syndromes" and are associated with various autoimmune markers and conditions, including warm-antibody AIHA (Coombs-positive). [2] **NEET-PG High-Yield Pearls:** * **Zieve’s Syndrome:** Look for a history of heavy alcohol binge, sudden jaundice, and hemolytic anemia with a negative Coombs test. * **Spur Cell Anemia:** Indicates advanced alcoholic liver disease and carries a very poor prognosis. * **Coombs-Positive AIHA** is also associated with SLE, CLL, and drugs like Methyldopa or Penicillin. * **Wilson’s Disease:** A crucial differential for liver failure with hemolytic anemia; however, the hemolysis in Wilson’s is typically Coombs-negative (due to direct toxic effects of copper on RBCs).

Q: Which of the following is NOT a metabolic complication of cirrhosis?

Hypoammonemia. Explanation: In cirrhosis, the liver's metabolic and synthetic functions are severely compromised. The correct answer is **Hypoammonemia** because cirrhosis characteristically leads to **Hyperammonemia**, not low levels. [1] 1. **Why Hypoammonemia is the Correct Answer:** The liver is the primary site for the **Urea Cycle**, which converts toxic ammonia (produced by gut bacteria and protein metabolism) into water-soluble urea for excretion. In cirrhosis, hepatocellular dysfunction and portosystemic shunting prevent this conversion. [1] This results in elevated serum ammonia levels (**Hyperammonemia**), which cross the blood-brain barrier and play a central role in the pathogenesis of **Hepatic Encephalopathy**. [1] 2. **Analysis of Incorrect Options:** * **Hyponatremia:** This is a hallmark of advanced cirrhosis. It is typically **dilutional (hypervolemic) hyponatremia** caused by the non-osmotic release of ADH (Vasopressin) due to splanchnic vasodilation and decreased effective arterial blood volume. * **Hypokalemia:** Frequently seen due to secondary hyperaldosteronism (the liver cannot degrade aldosterone) and the use of loop diuretics (e.g., Furosemide) to manage ascites. [2] * **Hypoglycemia:** The liver is responsible for glycogen storage and gluconeogenesis. In end-stage cirrhosis, the loss of functional hepatocytes leads to a failure in maintaining blood glucose levels during fasting. [3] **High-Yield NEET-PG Pearls:** * **Most common electrolyte abnormality in cirrhosis:** Hyponatremia. * **Precipitant of Hepatic Encephalopathy:** Hypokalemia (it increases renal ammonia production). * **Management of Hyperammonemia:** Lactulose (converts $NH_3$ to non-absorbable $NH_4^+$) and Rifaximin (reduces ammonia-producing gut flora).

Q: A 26-year-old man presents with intermittent cramping abdominal pain and low-volume diarrhea for 3 weeks. On physical examination, he is afebrile; there is mild lower abdominal tenderness but no masses, and bowel sounds are present. A stool sample is positive for occult blood. The symptoms subside within 1 week. Six months later, abdominal pain recurs with perianal pain. On physical examination, there is now a perirectal fistula. Colonoscopy shows many areas of mucosal edema and ulceration, and some areas that appear normal. Microscopic examination of a biopsy specimen from an ulcerated area shows a patchy acute and chronic inflammatory infiltrate, crypt abscesses, and noncaseating granulomas. Which of the following underlying disease processes best explains these findings?

Crohn disease. The clinical presentation and histopathology are classic for **Crohn Disease (CD)**. The key diagnostic features in this case include: 1. **Skip Lesions:** The colonoscopy shows "areas of mucosal edema and ulceration" interspersed with "areas that appear normal," which is the hallmark of CD [1]. 2. **Transmural Involvement & Fistulae:** The development of a perirectal fistula indicates inflammation extending through the entire bowel wall, a characteristic of CD (unlike Ulcerative Colitis, which is superficial) [1]. 3. **Noncaseating Granulomas:** This is a highly specific histological finding for Crohn disease (seen in ~35% of cases) and helps differentiate it from other forms of Inflammatory Bowel Disease (IBD). **Analysis of Incorrect Options:** * **Amebiasis:** Caused by *Entamoeba histolytica*, it typically presents with "flask-shaped" ulcers. While it can cause occult blood, it does not cause skip lesions, perianal fistulae, or noncaseating granulomas. * **Sarcoidosis:** While sarcoidosis is characterized by noncaseating granulomas, it rarely involves the gastrointestinal tract in isolation and does not typically present with skip lesions or perianal fistulae. * **Shigellosis:** This is an acute bacterial dysentery. It causes self-limiting, diffuse mucosal inflammation and does not lead to chronic recurring symptoms, fistulae, or granulomatous inflammation [1]. **NEET-PG High-Yield Pearls:** * **Distribution:** CD can affect any part of the GIT from "Mouth to Anus" (most common site is the terminal ileum) [1]. * **Morphology:** Look for "Cobblestone appearance," "Creeping fat," and "String sign of Kantor" on barium studies [1]. * **Smoking:** Smoking is a risk factor for Crohn Disease but is protective in Ulcerative Colitis. * **ASCA vs p-ANCA:** CD is often associated with **ASCA** (Anti-Saccharomyces cerevisiae antibodies), whereas UC is associated with **p-ANCA**.

Q: A 35-year-old lady presented with dysphagia, nocturnal asthma, and weight loss for 6 years. What is the most probable diagnosis?

Gastroesophageal reflux disease. **Explanation:** The clinical presentation of chronic dysphagia, weight loss, and **nocturnal asthma** in a 35-year-old patient most strongly points toward **Gastroesophageal Reflux Disease (GERD)**. 1. **Why GERD is correct:** GERD often presents with extra-esophageal manifestations. **Nocturnal asthma** (or chronic cough/wheezing) occurs due to micro-aspiration of gastric acid into the tracheobronchial tree during sleep. Long-standing GERD can lead to **peptic strictures**, causing dysphagia and subsequent weight loss due to reduced oral intake. 2. **Why other options are incorrect:** * **Achalasia Cardia:** While it causes dysphagia and nocturnal regurgitation, the regurgitated material is undigested food (neutral pH), which is less likely to trigger "asthma-like" bronchospasm compared to acid. * **Lye Stricture:** This requires a definitive history of corrosive ingestion. While it causes strictures and dysphagia, it doesn't typically present with nocturnal asthma unless there is a tracheoesophageal fistula. * **Carcinoma Esophagus:** Though it causes weight loss and dysphagia, a 6-year history is too prolonged for untreated malignancy, which usually follows a rapid, progressive course. **Clinical Pearls for NEET-PG:** * **Sandifer Syndrome:** A pediatric manifestation of GERD involving abnormal posturing/torticollis. * **Gold Standard Investigation for GERD:** 24-hour ambulatory pH monitoring (DeMeester Score >14.72). * **Surgical Management:** Nissen Fundoplication (360° wrap) is the procedure of choice. * **Complication:** Barrett’s Esophagus (Metaplasia: Stratified squamous to Columnar epithelium) is a precursor to Adenocarcinoma.

Q: Dementia is a feature of which disease?

Whipple disease. **Explanation:** **Whipple Disease** is a rare systemic infectious disease caused by the gram-positive bacterium *Tropheryma whipplei*. It typically presents as a multi-system disorder. While malabsorption and weight loss are hallmark features, the involvement of the Central Nervous System (CNS) is a critical diagnostic clue. CNS manifestations occur in approximately 10–40% of cases and can include **dementia**, ophthalmoplegia, and myoclonus. A highly specific pathognomonic sign is **oculomasticatory myorhythmia** (pendular eye movements synchronized with jaw contractions). **Analysis of Incorrect Options:** * **Celiac Disease:** Primarily presents with malabsorption, dermatitis herpetiformis, and ataxia (gluten ataxia), but dementia is not a standard clinical feature. * **Tropical Sprue:** A chronic diarrheal illness seen in residents or visitors to the tropics; it leads to megaloblastic anemia (Vitamin B12/Folate deficiency) but does not cause primary dementia. * **Crohn Disease:** An inflammatory bowel disease (IBD) characterized by transmural inflammation and granulomas. Extraintestinal manifestations include uveitis, arthritis, and erythema nodosum, but not dementia. **High-Yield Clinical Pearls for NEET-PG:** * **Organism:** *Tropheryma whipplei* (PAS-positive macrophages in the lamina propria). * **Classic Tetrad:** Diarrhea/Malabsorption, Weight loss, Arthralgia (most common early symptom), and Lymphadenopathy. * **Biopsy:** Small intestinal biopsy shows "foamy macrophages" containing PAS-positive, acid-fast negative bacilli. * **Treatment:** Initial Ceftriaxone followed by oral Trimethoprim-sulfamethoxazole (TMP-SMX) for 1 year to cross the blood-brain barrier and prevent CNS relapse.

Q: Reflux esophagitis is defined as the esophageal pH being less than which value?

4. **Explanation:** The diagnosis of Gastroesophageal Reflux Disease (GERD) via 24-hour ambulatory pH monitoring is based on the **"Rule of 4."** Reflux esophagitis is defined as a drop in esophageal pH to **less than 4**. **Why 4 is the threshold:** The esophageal mucosa is physiologically sensitive to acid [1]. While the stomach maintains a very low pH, the esophagus typically maintains a neutral pH. Clinical studies and the **DeMeester Scoring system** have established that a pH < 4 is the critical threshold where pepsin becomes activated and the esophageal epithelium begins to undergo damage (acid injury). Monitoring the "Time pH < 4" (Total Acid Exposure Time) is the most reliable parameter for diagnosing pathological reflux [1]. **Analysis of Incorrect Options:** * **Options A (1) and B (2):** These represent extreme acidity levels typically found in the gastric lumen. While these values certainly cause damage, they are too restrictive for a diagnostic threshold; many patients suffer significant esophagitis at a pH of 3 or 3.5. * **Option C (3):** While acidic, a threshold of 3 would miss a significant number of reflux episodes that occur between pH 3 and 4, leading to a high false-negative rate. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** 24-hour ambulatory pH monitoring is the gold standard for diagnosing GERD, especially in patients with persistent symptoms despite PPI therapy and normal endoscopy. * **DeMeester Score:** A composite score used to quantify reflux; a score **>14.72** is considered abnormal. * **Bravo Capsule:** A wireless pH monitoring system that allows for 48–96 hours of data collection, offering better patient tolerance than the transnasal catheter. * **Impedance Testing:** Often combined with pH monitoring to detect **non-acid (weakly alkaline) reflux**, which pH monitoring alone might miss.

Question 1

Coomb's positive hemolytic anemia is seen in all of the following conditions except:

Accepted Answer

Alcoholic cirrhosis

Answer

Chronic active hepatitis

Answer

Primary biliary cirrhosis

Answer

Primary sclerosing cholangitis

Question 2

Which of the following is NOT a metabolic complication of cirrhosis?

Accepted Answer

Hypoammonemia

Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypoglycemia

Question 3

A thirty-year-old male presents to the emergency department with symptoms of epigastric pain radiating to the back. He gives a history of epigastric pain that wakes him up at night and is relieved by consuming food. His past history reveals two episodes of perforated duodenal ulcers which were treated with omental patch surgeries. Pain, before and after the surgery, has been controlled with proton pump inhibitors and analgesics. What is the likely diagnosis on this occasion?

Accepted Answer

Duodenal ulcer

Answer

Gastric ulcer

Answer

Atrophic gastritis

Answer

Chronic pancreatitis

Question 4

A 26-year-old man presents with intermittent cramping abdominal pain and low-volume diarrhea for 3 weeks. On physical examination, he is afebrile; there is mild lower abdominal tenderness but no masses, and bowel sounds are present. A stool sample is positive for occult blood. The symptoms subside within 1 week. Six months later, abdominal pain recurs with perianal pain. On physical examination, there is now a perirectal fistula. Colonoscopy shows many areas of mucosal edema and ulceration, and some areas that appear normal. Microscopic examination of a biopsy specimen from an ulcerated area shows a patchy acute and chronic inflammatory infiltrate, crypt abscesses, and noncaseating granulomas. Which of the following underlying disease processes best explains these findings?

Accepted Answer

Crohn disease

Answer

Amebiasis

Answer

Sarcoidosis

Answer

Shigellosis

Question 5

A 35-year-old lady presented with dysphagia, nocturnal asthma, and weight loss for 6 years. What is the most probable diagnosis?

Accepted Answer

Gastroesophageal reflux disease

Answer

Achalasia cardia

Answer

Lye stricture of esophagus

Answer

Carcinoma esophagus

Question 6

Dementia is a feature of which disease?

Accepted Answer

Whipple disease

Answer

Celiac disease

Answer

Tropical sprue

Answer

Crohn disease

Question 7

A 29-year-old woman has recently developed milk intolerance. What is the most likely underlying condition?

Accepted Answer

celiac disease

Answer

gastrinoma

Answer

hyperthyroidism

Answer

associated with skin pigmentation

Question 8

Reflux esophagitis is defined as the esophageal pH being less than which value?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 9

Which of the following is true regarding chronic pancreatitis?

Accepted Answer

It is caused by a mutation of the cationic trypsinogen gene.

Answer

It is an autosomal recessive disorder.

Answer

It accounts for about 30% of cases.

Answer

Immunoglobulin G concentrations are elevated.

Question 10

What is the most common symptom of primary biliary cirrhosis?

Accepted Answer

Pruritus

Answer

Abdominal pain

Answer

Jaundice

Answer

Bleeding

Gastroenterology — MCQs

Gastroenterology — MCQs

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