Gastroenterology — MCQs

A 58-year-old man with cirrhosis complains of worsening fatigue and confusion over the past 5 days. He also reports that over the past 48 hours he has had a declining urinary output. On examination, he is gaunt and jaundiced. He has tense ascites and a liver span of 7 cm in the midclavicular line. Lab results reveal a WBC 4600/mm3, Hb 9.4 g/dL, and PCB 29%. BUN of 34 mg/dL and a creatinine of 3.1 mg/dL. A urinary Na <10 mEq/L. What is the most appropriate treatment for his elevated BUN and creatinine?

Q29Medium

A 45-year-old male presents with weakness. He is a chronic alcoholic and has hepatomegaly and icterus. His blood tests show elevated transaminases, and USG reveals fatty liver. Which of the following substances may be responsible for his liver condition?

Q30Medium

A 63-year-old man with a long history of alcohol abuse presents with ascites, mild abdominal discomfort, and nausea. Examination reveals tense ascites and generalized tenderness but no rigidity. A diagnostic paracentesis is performed. Which of the following ascitic fluid results is most likely to suggest uncomplicated ascites due to portal hypertension from cirrhosis?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 21: A patient presents with pain in the left hypochondrium, vomiting, diarrhea, melena, and weight loss. What is the most likely diagnosis?

A. Cholangitis
B. Enterocolitis
C. Zollinger-Ellison syndrome (Correct Answer)
D. Amebiasis

Explanation: **Explanation:** **Zollinger-Ellison Syndrome (ZES)** is caused by a gastrin-secreting neuroendocrine tumor (gastrinoma), typically located in the duodenum or pancreas. The hallmark of ZES is hypergastrinemia, which leads to massive gastric acid hypersecretion [1]. * **Why Option C is correct:** The clinical presentation aligns perfectly with the pathophysiology of ZES. * **Pain in the left hypochondrium:** This is often due to multiple or refractory peptic ulcers (most commonly in the duodenum, but sometimes in the stomach or jejunum). * **Diarrhea:** High acid volume denatures pancreatic enzymes and precipitates bile salts, leading to malabsorption and steatorrhea. * **Melena:** Results from bleeding peptic ulcers. * **Weight loss:** Occurs due to a combination of malabsorption and sitophobia (fear of eating due to pain) [1]. **Analysis of Incorrect Options:** * **A. Cholangitis:** Typically presents with **Charcot’s Triad** (RUQ pain, fever, and jaundice). It does not cause melena or chronic weight loss. * **B. Enterocolitis:** Usually presents with acute onset fever, abdominal cramping, and watery/bloody diarrhea, but is unlikely to cause chronic weight loss or upper GI bleeding (melena) unless it is a specific chronic inflammatory condition. * **D. Amebiasis:** Primarily presents with bloody diarrhea (dysentery) and RUQ pain if a liver abscess develops, but it does not explain the severe acid-related symptoms or left-sided pain. **NEET-PG High-Yield Pearls:** * **Diagnosis:** Best initial test is **Fasting Serum Gastrin** (>1000 pg/mL is diagnostic). The most specific provocative test is the **Secretin Stimulation Test** (gastrin levels rise >200 pg/mL). * **Location:** Most gastrinomas are found in the **Gastrinoma Triangle** (junction of cystic/common duct, junction of 2nd/3rd part of duodenum, and neck/body of pancreas). * **Association:** Approximately 25% of cases are associated with **MEN-1 syndrome** (3 Ps: Pituitary, Parathyroid, Pancreas) [1].

Question 22: What is the most common cause of epidural abscess?

A. Staphylococcus (Correct Answer)
B. Streptococcus
C. Gram negative bacilli
D. Microaerophilic anaerobic streptococci

Explanation: **Explanation:** The most common cause of a spinal epidural abscess (SEA) is **Staphylococcus aureus**, accounting for approximately **60-90%** of all cases [2]. This is primarily due to the organism's high virulence and its prevalence on the skin, allowing it to enter the epidural space via hematogenous spread (from skin/soft tissue infections or IV drug use) or direct inoculation (during spinal surgery or epidural anesthesia) [2]. **Analysis of Options:** * **A. Staphylococcus (Correct):** *S. aureus* is the leading pathogen. Coagulase-negative Staphylococci (e.g., *S. epidermidis*) are also frequently isolated, especially in cases involving spinal hardware or recent procedures [2]. * **B. Streptococcus:** These are the second most common aerobic organisms but occur significantly less frequently than Staphylococci [1]. * **C. Gram-negative bacilli:** Organisms like *E. coli* or *Pseudomonas* are typically seen only in specific contexts, such as urinary tract infections, IV drug use, or following abdominal/pelvic procedures. * **D. Microaerophilic anaerobic streptococci:** These are rare causes, usually associated with a contiguous spread from a pharyngeal or dental source [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Fever, spinal pain (localized), and neurological deficits (though the full triad is present in only <15% of patients). * **Risk Factors:** Diabetes mellitus (most common), IV drug use, chronic kidney disease, and recent spinal instrumentation. * **Gold Standard Investigation:** **MRI with gadolinium contrast** is the imaging modality of choice. * **Management:** Emergency surgical decompression and drainage combined with long-term antibiotics is the standard of care to prevent permanent neurological damage.

Question 23: A young patient presents with dysphagia, more for liquids than solids, and often regurgitates food at night. Radiography shows a 'rat-tailed' appearance. What is the likely diagnosis?

A. Achalasia cardia (Correct Answer)
B. Carcinoma esophagus
C. Zenker's diverticulum
D. Diffuse esophageal spasm

Explanation: ### Explanation **Correct Option: A. Achalasia cardia** Achalasia is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis in the distal esophagus [1]. * **Clinical Presentation:** Unlike mechanical obstructions (like cancer), motility disorders like Achalasia present with **dysphagia for both solids and liquids** [1] from the onset, or often more prominently for liquids. * **Radiology:** A Barium swallow typically shows a dilated esophagus with smooth, tapered narrowing at the gastroesophageal junction, classically described as a **'Bird’s beak'** or **'Rat-tail'** appearance [1]. Night-time regurgitation occurs due to the accumulation of undigested food in the dilated esophagus. **Why other options are incorrect:** * **B. Carcinoma esophagus:** This is a mechanical obstruction. Dysphagia is **progressive**, starting with solids and only later involving liquids [1]. Radiography would show an irregular, "apple-core" filling defect rather than smooth tapering. * **C. Zenker’s diverticulum:** While it causes regurgitation and halitosis, it is a structural outpouching in the pharynx (Killian's dehiscence) [1]. It does not produce the characteristic "rat-tail" narrowing of the distal esophagus. * **D. Diffuse esophageal spasm (DES):** This presents with intermittent chest pain and dysphagia. The classic radiographic finding is a **'Corkscrew'** or 'Rosary bead' esophagus, not a rat-tail appearance. **High-Yield Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis) [1]. * **Pathology:** Loss of inhibitory nitrergic neurons in the **Auerbach’s (Myenteric) plexus** [1]. * **Heller’s Myotomy:** The surgical treatment of choice, usually combined with a partial fundoplication. * **Chagas Disease:** A common secondary cause of achalasia (caused by *Trypanosoma cruzi*).

Question 24: Majority of patients with HNPCC have mutations in which gene?

A. MSH1
B. MSH2 (Correct Answer)
C. MSH3
D. MSH4

Explanation: Hereditary Non-Polyposis Colorectal Cancer (HNPCC), also known as **Lynch Syndrome**, is an autosomal dominant condition caused by germline mutations in **DNA Mismatch Repair (MMR) genes** [1]. These genes are responsible for correcting errors (mismatches) that occur during DNA replication [1]. When these genes are defective, it leads to **Microsatellite Instability (MSI)** and an increased risk of colorectal and extra-colonic cancers [1]. **Why MSH2 is the correct answer:** While several MMR genes are implicated, **MSH2** and **MLH1** are the most frequently mutated, accounting for approximately 90% of all HNPCC cases [1]. Among these, **MSH2** is generally considered the most common (approx. 50-60%), followed closely by MLH1 (approx. 30-35%). **Analysis of Incorrect Options:** * **MSH1:** This is a common distractor; the actual gene is **MLH1**. There is no "MSH1" gene involved in Lynch Syndrome. * **MSH3:** While MSH3 is an MMR gene, mutations in this gene are rare in HNPCC and do not account for the majority of cases. * **MSH4:** This gene is involved in meiotic recombination rather than the mismatch repair pathway associated with Lynch Syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Amsterdam II Criteria:** Used for clinical diagnosis (3-2-1 rule: 3 relatives, 2 generations, 1 diagnosed before age 50) [2]. * **Associated Cancers:** Endometrial cancer (most common extra-colonic), ovarian, gastric, and small bowel cancers. * **Tumor Location:** Predominantly occurs in the **proximal/right colon** (cecum to splenic flexure). * **Pathology:** Often shows "Crohn’s-like" lymphoid reaction and signet ring cells.

Question 25: Skip lesions are characteristic findings in which of the following conditions?

A. Ulcerative colitis
B. Crohn's disease (Correct Answer)
C. Typhoid
D. Tuberculosis

Explanation: Explanation: **Crohn's Disease (Correct Answer):** Skip lesions are a hallmark pathological feature of Crohn's disease. This term refers to the **discontinuous** nature of the inflammation, where segments of diseased bowel are separated by areas of normal-appearing mucosa [1]. This occurs because Crohn's disease is a transmural inflammatory process that can affect any part of the gastrointestinal tract (from mouth to anus), though it most commonly involves the terminal ileum and cecum. **Analysis of Incorrect Options:** * **Ulcerative Colitis:** Unlike Crohn's, inflammation in UC is **continuous** and starts from the rectum, extending proximally [1]. It is limited to the mucosa and submucosa and does not skip segments [1]. * **Typhoid:** Characterized by inflammation of Peyer's patches in the terminal ileum, leading to longitudinal ulcers along the long axis of the bowel. It does not present with the "skip" pattern seen in IBD. * **Tuberculosis (Intestinal):** Typically involves the ileocecal region. While it can cause multiple strictures, the classic description involves transverse ulcers and "confluent" granulomas, rather than the specific skip lesion pattern of Crohn's. **High-Yield Clinical Pearls for NEET-PG:** * **Transmural Involvement:** Crohn’s affects all layers; UC is superficial (mucosa/submucosa) [1]. * **Cobblestone Appearance:** In Crohn's, deep longitudinal and transverse ulcers with intervening edematous mucosa create a "cobblestone" look. * **String Sign of Kantor:** A radiological finding in Crohn's due to terminal ileal narrowing [2]. * **Granulomas:** Non-caseating granulomas are pathognomonic for Crohn's (found in ~40-60% of cases). * **Creeping Fat:** Mesenteric fat wrapping around the bowel is highly suggestive of Crohn's.

Question 26: A 35-year-old patient presented with 2 episodes of hematemesis. On examination, his pulse rate is 100/min with a BP of 90/60 mm Hg. Per abdominal examination shows spleen palpable 3 cm below the costal margin. Which of the following is true about this patient?

A. Elevated CRP and low C3
B. Most common site of bleeding is the first part of the duodenum
C. Urgent elective intubation of the patient
D. The increased portal vein pressure should be lowered with octreotide (Correct Answer)

Explanation: ### Explanation This patient presents with **upper gastrointestinal bleeding (UGIB)** and **splenomegaly**, a classic triad suggesting **Portal Hypertension** (likely due to cirrhosis or non-cirrhotic portal fibrosis) [1]. The presence of hypotension (90/60 mmHg) and tachycardia indicates hemodynamic instability due to variceal hemorrhage [1]. **Why Option D is Correct:** In suspected variceal bleeding, the immediate goal is to reduce portal venous pressure to achieve hemostasis. **Octreotide** (a somatostatin analogue) is the drug of choice. It causes selective splanchnic vasoconstriction, thereby reducing portal blood flow and pressure without the systemic side effects seen with vasopressin [2]. **Analysis of Incorrect Options:** * **Option A:** Elevated CRP and low C3 are markers typically associated with systemic lupus erythematosus (SLE) or certain glomerulonephritides, not portal hypertension or acute UGIB. * **Option B:** While a **duodenal ulcer** (first part of the duodenum) is the most common cause of overall UGIB, the presence of **splenomegaly** in this clinical vignette strongly points toward **esophageal varices** as the specific source [1]. * **Option C:** "Urgent elective" is a contradictory term. While airway protection is vital in massive hematemesis, intubation is not mandatory for every patient unless there is altered sensorium, massive ongoing hematemesis, or respiratory distress. Stabilization begins with fluid resuscitation [1]. **Clinical Pearls for NEET-PG:** * **Management Priority:** Hemodynamic stabilization (IV fluids) → Pharmacotherapy (Octreotide/Terlipressin) → Definitive diagnosis/treatment (Endoscopic Variceal Ligation - EVL) [3]. * **Drug of Choice:** Terlipressin is the only drug proven to improve survival in variceal bleeding, but Octreotide is more commonly used due to its safety profile [3]. * **Prophylaxis:** Propranolol (non-selective beta-blocker) is used for primary and secondary prophylaxis, but it is **contraindicated** during an acute bleeding episode.

Question 27: Which metabolic disorder can lead to acute pancreatitis?

A. Hypoparathyroidism
B. Hyperparathyroidism (Correct Answer)
C. Hypothyroidism
D. Hyperthyroidism

Explanation: **Explanation:** **Hyperparathyroidism** is a well-recognized metabolic cause of acute pancreatitis [1]. The underlying mechanism is primarily driven by **hypercalcemia**. Elevated serum calcium levels lead to the activation of trypsinogen into trypsin within the pancreatic parenchyma, causing autodigestion. Additionally, high calcium levels can lead to the formation of calcium stones in the pancreatic ducts, causing obstruction and subsequent inflammation. **Analysis of Options:** * **Hyperparathyroidism (Correct):** Primary hyperparathyroidism (often due to a parathyroid adenoma) results in hypercalcemia, which is the direct trigger for pancreatitis [1]. * **Hypoparathyroidism (Incorrect):** This condition leads to *hypocalcemia*. While hypocalcemia is a common *consequence* (prognostic marker) of acute pancreatitis due to saponification of fat, it is not a cause [1]. * **Hypothyroidism & Hyperthyroidism (Incorrect):** Thyroid dysfunctions are not typically associated with acute pancreatitis. While severe hypothyroidism (myxedema) can cause slowed GI motility, it does not trigger pancreatic enzyme activation. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Causes:** Apart from hypercalcemia, **Hypertriglyceridemia** (typically Type I, IV, or V hyperlipoproteinemia with TG levels >1000 mg/dL) is a major metabolic cause of pancreatitis [1]. * **The "Stones" Connection:** Remember the classic pentad for primary hyperparathyroidism: *Stones (renal), Bones (osteitis fibrosa cystica), Groans (abdominal pain/pancreatitis), Thrones (polyuria), and Psychic overtones.* * **Drug-Induced:** Always remember drugs like Azathioprine, Sulfonamides, and Valproate as high-yield triggers for the exam. * **Scorpion Sting:** In the context of NEET-PG, *Tityus trinitatis* scorpion venom is a classic cause of acute pancreatitis [1].

Question 28: A 58-year-old man with cirrhosis complains of worsening fatigue and confusion over the past 5 days. He also reports that over the past 48 hours he has had a declining urinary output. On examination, he is gaunt and jaundiced. He has tense ascites and a liver span of 7 cm in the midclavicular line. Lab results reveal a WBC 4600/mm3, Hb 9.4 g/dL, and PCB 29%. BUN of 34 mg/dL and a creatinine of 3.1 mg/dL. A urinary Na <10 mEq/L. What is the most appropriate treatment for his elevated BUN and creatinine?

A. Large volume paracentesis
B. Hemodialysis
C. Mesocaval shunt
D. Liver transplantation (Correct Answer)

Explanation: ### Explanation The clinical presentation of a patient with cirrhosis, tense ascites, worsening encephalopathy (confusion), and progressive renal failure (elevated creatinine, low urinary sodium <10 mEq/L) in the absence of intrinsic kidney disease is diagnostic of **Hepatorenal Syndrome (HRS)** [1]. **1. Why Liver Transplantation is the Correct Answer:** HRS is a functional renal failure caused by intense renal vasoconstriction due to splanchnic vasodilation in advanced portal hypertension. While medical therapies (like Albumin and Terlipressin) can act as a bridge, **Liver Transplantation** is the only definitive treatment for HRS [1]. It reverses the underlying portal hypertension and systemic circulatory dysfunction, leading to the resolution of renal impairment in the majority of patients [1]. **2. Why the Other Options are Incorrect:** * **Large Volume Paracentesis (LVP):** While it may relieve respiratory distress from tense ascites, LVP without adequate albumin replacement can actually worsen circulatory dysfunction and precipitate or aggravate HRS. * **Hemodialysis:** This is a supportive measure for electrolyte imbalances or fluid overload but does not treat the underlying cause of HRS [1]. It is usually reserved for patients who are candidates for transplantation or have acute life-threatening indications. * **Mesocaval Shunt:** Portosystemic shunts are generally contraindicated in patients with advanced liver failure and HRS due to the high risk of worsening hepatic encephalopathy and high surgical mortality. **3. Clinical Pearls for NEET-PG:** * **HRS Type 1:** Rapidly progressive (doubling of creatinine to >2.5 mg/dL in <2 weeks) [1]. * **HRS Type 2:** Slower progression; typically presents as refractory ascites [1]. * **Diagnostic Hallmark:** Urinary Sodium **<10 mEq/L** and a normal urinary sediment (distinguishes it from ATN) [1]. * **Medical Bridge:** The combination of **Terlipressin** (vasoconstrictor) and **Albumin** is the first-line medical management to improve renal perfusion before transplant [1].

Question 29: A 45-year-old male presents with weakness. He is a chronic alcoholic and has hepatomegaly and icterus. His blood tests show elevated transaminases, and USG reveals fatty liver. Which of the following substances may be responsible for his liver condition?

A. Orotic acid
B. Pyridoxine and pantothenic acid deficiency
C. Alcohol
D. All of the above (Correct Answer)

Explanation: **Explanation:** The clinical presentation of hepatomegaly, icterus, and elevated transaminases in a chronic alcoholic points toward **Alcoholic Liver Disease (ALD)**, specifically **Steatosis (Fatty Liver)**. The pathogenesis of fatty liver involves an imbalance between the synthesis/uptake of triglycerides and their excretion/oxidation. **Why "All of the Above" is correct:** Fatty liver (steatosis) can be induced by various mechanisms that impair lipid metabolism: 1. **Alcohol (Option C):** This is the most common cause in this patient. Alcohol metabolism increases the **NADH/NAD+ ratio**, which inhibits fatty acid oxidation and stimulates lipogenesis [1]. It also impairs the assembly and secretion of Very Low-Density Lipoproteins (VLDL) [1]. 2. **Orotic Acid (Option A):** In experimental models and specific metabolic states, orotic acid inhibits the release of VLDL from hepatocytes into the blood, leading to an accumulation of triglycerides within the liver. 3. **Pyridoxine and Pantothenic Acid Deficiency (Option B):** Chronic alcoholics are frequently malnourished [2]. Pantothenic acid is a precursor to **Coenzyme A (CoA)**, which is essential for fatty acid oxidation. Pyridoxine (B6) deficiency further deranges amino acid and lipid metabolism. A lack of these cofactors prevents the liver from processing fats efficiently. **Clinical Pearls for NEET-PG:** * **AST:ALT Ratio:** In alcoholic liver disease, the ratio is typically **>2:1** (AST is higher because alcohol induces mitochondrial damage and pyridoxine deficiency suppresses ALT activity). * **Mallory-Denk Bodies:** These are eosinophilic cytoplasmic inclusions (damaged intermediate filaments) seen in alcoholic hepatitis. * **First Change:** Steatosis (fatty liver) is the earliest and most common histological change in alcohol consumption and is **reversible** with abstinence. * **Other causes of Steatosis:** Protein-energy malnutrition (Kwashiorkor), Obesity, Diabetes Mellitus, and drugs like Valproate or Amiodarone.

Question 30: A 63-year-old man with a long history of alcohol abuse presents with ascites, mild abdominal discomfort, and nausea. Examination reveals tense ascites and generalized tenderness but no rigidity. A diagnostic paracentesis is performed. Which of the following ascitic fluid results is most likely to suggest uncomplicated ascites due to portal hypertension from cirrhosis?

A. Hemorrhage
B. Protein > 2.5 g/dL
C. Bilirubin level twice that of serum
D. Serum to ascites albumin gradient > 1.1 g/dL (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Serum to ascites albumin gradient (SAAG) > 1.1 g/dL.** The SAAG is the most reliable tool for differentiating the etiology of ascites [1]. It is calculated as: **SAAG = (Serum Albumin) – (Ascitic Fluid Albumin).** A SAAG ≥ 1.1 g/dL indicates that the ascites is caused by **portal hypertension** (transudative) [1]. In cirrhosis, increased hydrostatic pressure in the hepatic sinusoids forces fluid into the peritoneal cavity, but the large albumin molecules are relatively retained in the vascular space, leading to a high gradient [1]. **Analysis of Incorrect Options:** * **A. Hemorrhage:** Bloody ascitic fluid (RBC > 10,000/µL) is typically associated with malignancy (e.g., Hepatocellular carcinoma) or traumatic taps, not uncomplicated cirrhosis. * **B. Protein > 2.5 g/dL:** This indicates **high-protein ascites** (exudative). Uncomplicated cirrhotic ascites is typically low-protein (< 2.5 g/dL) because the cirrhotic liver has impaired protein synthesis and the sinusoids are scarred [1]. High-protein ascites with a high SAAG suggests cardiac failure or Budd-Chiari syndrome [1]. * **C. Bilirubin level twice that of serum:** This is a specific marker for **biliary perforation** or a ruptured gallbladder, not portal hypertension [2]. **High-Yield Clinical Pearls for NEET-PG:** * **SAAG ≥ 1.1 (High Gradient):** Cirrhosis, Congestive Heart Failure, Budd-Chiari Syndrome, Portal vein thrombosis [1]. * **SAAG < 1.1 (Low Gradient):** Peritoneal tuberculosis, Malignancy (Peritoneal carcinomatosis), Nephrotic syndrome, Pancreatitis [1]. * **Spontaneous Bacterial Peritonitis (SBP):** Diagnosed when ascitic fluid Absolute Neutrophil Count (ANC) is **> 250 cells/mm³**. * **Serum-Ascites Albumin Gradient** has replaced the old "Transudate vs. Exudate" (Total Protein) classification as it is 97% accurate in identifying portal hypertension [1].

Practice by Chapter

Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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