Gastroenterology Practice Questions

Q: Which one of the following is not a feature of irritable bowel syndrome?

Rectal bleeding. **Explanation:** Irritable Bowel Syndrome (IBS) is a **functional gastrointestinal disorder** characterized by chronic abdominal pain and altered bowel habits in the absence of demonstrable organic pathology [1]. The diagnosis is primarily clinical, based on the **Rome IV Criteria**. **Why Rectal Bleeding is the Correct Answer:** Rectal bleeding is considered an **"Alarm Symptom" (Red Flag)** [1]. Since IBS does not involve mucosal inflammation, ulceration, or malignancy, it should never cause hematochezia or melena. The presence of rectal bleeding necessitates further investigation (e.g., colonoscopy) to rule out organic diseases such as Inflammatory Bowel Disease (IBD), colorectal cancer, or hemorrhoids [1]. **Analysis of Incorrect Options:** * **Abdominal Pain (A):** This is the hallmark of IBS. According to Rome IV, pain must be recurrent (at least 1 day/week in the last 3 months) and related to defecation or changes in stool frequency/form [1]. * **Constipation (B):** Altered bowel habits are central to IBS [1]. Patients are categorized into subtypes: IBS-C (Constipation predominant), IBS-D (Diarrhea predominant), or IBS-M (Mixed). * **Bloating (D):** While not a formal part of the diagnostic criteria, abdominal bloating and distension are very common subjective complaints in IBS patients due to visceral hypersensitivity and altered gas transit [1]. **NEET-PG High-Yield Pearls:** * **Rome IV Criteria:** Recurrent abdominal pain ≥1 day/week in the last 3 months associated with ≥2 of: 1. Related to defecation, 2. Change in stool frequency, 3. Change in stool form [1]. * **Red Flags (Not IBS):** Weight loss (>5kg), nocturnal diarrhea, anemia, rectal bleeding, onset after age 50, or family history of colon cancer [1]. * **Treatment:** High-fiber diet, antispasmodics (Dicyclomine), and for refractory cases, TCAs or SSRIs.

Q: All of the following are true about refeeding syndrome except?

Occurs with TPN only, not seen in enteral nutrition. Refeeding syndrome is a potentially fatal metabolic complication that occurs when nutrition is reintroduced too rapidly in patients with severe, chronic malnutrition (e.g., anorexia nervosa, chronic alcoholism, or prolonged starvation). **1. Why Option A is the Correct Answer (The Exception):** Refeeding syndrome is **not** exclusive to Total Parenteral Nutrition (TPN). It can occur regardless of the route of administration—including **enteral (tube) feeding and oral intake**. The trigger is the sudden availability of glucose, which leads to a massive surge in **insulin**. This shifts electrolytes (phosphorus, potassium, and magnesium) from the extracellular space into the cells, causing dangerous serum deficiencies [1]. **2. Analysis of Other Options:** * **Option B:** True. Severe hypokalemia and hypomagnesemia prolong the QT interval and predispose the patient to fatal cardiac **arrhythmias** and heart failure. * **Option C:** True. The syndrome is specifically triggered by the **rapid and excessive** reintroduction of calories in a body that has adapted to a catabolic state. * **Option D:** True. **Hypophosphatemia** is the biochemical hallmark of refeeding syndrome [1]. Along with hypomagnesemia and hypokalemia, these must be aggressively monitored and replaced to prevent multi-organ failure. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark:** Hypophosphatemia [1]. * **Vitamin Deficiency:** Thiamine (Vitamin B1) deficiency is often exacerbated, as it is a co-factor for glucose metabolism; its depletion can lead to Wernicke’s encephalopathy. * **Prevention:** "Start low and go slow." Begin at 10–15 kcal/kg/day and supplement with Thiamine before starting nutrition. * **Most common cause of death:** Cardiac arrhythmias.

Q: What is the most likely diagnosis in a 25-year-old male patient presenting with jaundice, a serum total bilirubin of 21 mg/dL, a direct bilirubin of 9.6 mg/dL, and an alkaline phosphatase of 84 KA units?

Obstructive jaundice. **Explanation:** The diagnosis of **Obstructive Jaundice** (extrahepatic cholestasis) is primarily established by analyzing the pattern of liver function tests (LFTs) [2]. 1. **Why Obstructive Jaundice is correct:** * **Conjugated Hyperbilirubinemia:** The patient has a direct bilirubin of 9.6 mg/dL (approx. 45% of total), indicating a significant conjugated component. * **Markedly Elevated Alkaline Phosphatase (ALP):** The ALP is **84 KA units**. In the King-Armstrong (KA) unit system, the normal range is 3–13 KA units. A value of 84 is >6 times the upper limit of normal. In clinical practice, an ALP elevation >3 times the normal limit is highly suggestive of cholestasis or biliary obstruction [3]. 2. **Why other options are incorrect:** * **Hemolytic Anemia:** This presents with **unconjugated** (indirect) hyperbilirubinemia. Direct bilirubin is typically <15% of the total, and ALP remains normal [2]. * **Viral/Drug-induced Hepatitis:** These are hepatocellular patterns of injury. While bilirubin can be high, the hallmark is a massive rise in **transaminases (ALT/AST)** [1]. While ALP can be elevated in hepatitis, it rarely reaches the extreme levels seen in mechanical obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Normal ALP Ranges:** 3–13 KA units (King-Armstrong) or 40–125 IU/L. * **Bilirubin Partitioning:** If direct bilirubin is >50% of total, it is conjugated hyperbilirubinemia (Obstructive/Hepatocellular). If <20%, it is unconjugated (Hemolysis/Gilbert’s). * **Courvoisier’s Law:** In a patient with obstructive jaundice, if the gallbladder is palpable, the obstruction is likely due to a malignancy (e.g., Periampullary carcinoma) rather than gallstones. * **Fractional Excretion:** In obstructive jaundice, urine will be dark (bilirubinuria) and stools may be clay-colored (acholic) [3].

Q: What is the mainstay of treatment for a patient with mild ulcerative colitis?

5-ASA agents. **Explanation:** The mainstay of treatment for **mild to moderate ulcerative colitis (UC)** is **5-Aminosalicylic acid (5-ASA)** agents, such as Sulfasalazine or Mesalamine [1]. These drugs act locally on the colonic mucosa to inhibit the production of pro-inflammatory cytokines and leukotrienes. For distal disease (proctitis), topical 5-ASAs (suppositories/enemas) are preferred, while oral formulations are used for extensive colitis [1]. **Analysis of Options:** * **A. 5-ASA agents (Correct):** They are the first-line therapy for both induction of remission and maintenance in mild-to-moderate UC due to their high efficacy and favorable safety profile [1]. * **B. Corticosteroids:** These are used for **induction of remission** in moderate-to-severe UC or in patients who do not respond to 5-ASAs [1]. They are never used for maintenance therapy due to significant systemic side effects. * **C. Azathioprine:** This is an immunomodulator used for **maintaining remission** in patients who are steroid-dependent or have frequent relapses. It has a slow onset of action (3–6 months) and is not used for acute induction. * **D. Antibiotics:** Unlike in Crohn’s disease (where they may treat fistulas or abscesses), antibiotics have no proven primary role in the routine management of ulcerative colitis unless a secondary infection (like *C. difficile*) is suspected. **High-Yield Clinical Pearls for NEET-PG:** * **Sulfasalazine** consists of Sulfapyridine (carrier) and 5-ASA. Most side effects are due to the sulfapyridine moiety. * **Mesalamine** is the preferred 5-ASA as it lacks the sulfa component, leading to better tolerance. * **Step-up therapy:** If 5-ASAs fail, move to Corticosteroids $\rightarrow$ Immunomodulators (Azathioprine) $\rightarrow$ Biologics (Infliximab) $\rightarrow$ Surgery [1]. * **Surgery (Proctocolectomy)** is considered curative in UC, unlike in Crohn’s disease [2].

Q: Blood culture is indicated in all the following conditions, except:

Malaria. **Explanation:** The correct answer is **Malaria (Option D)**. Blood culture is a diagnostic tool used to detect the presence of viable bacteria or fungi in the bloodstream (bacteremia or fungemia) [1]. **Why Malaria is the exception:** Malaria is caused by protozoan parasites of the genus *Plasmodium*. These are intracellular parasites that infect red blood cells. They do not grow on standard aerobic or anaerobic bacterial culture media. The gold standard for diagnosis is **microscopic examination of peripheral blood smears** (thick and thin smears) or **Rapid Diagnostic Tests (RDTs)** that detect parasite antigens (e.g., HRP-2, LDH). **Analysis of other options:** * **Enteric Fever (Option A):** Blood culture is the investigation of choice during the **first week** of illness. It has a sensitivity of 70-90% before antibiotics are started. * **Subacute Bacterial Endocarditis (Option B):** Blood cultures are the cornerstone of diagnosis (part of the **Duke Criteria**). Multiple sets are required to capture the continuous bacteremia characteristic of this condition [2]. * **Septicemia (Option C):** By definition, septicemia involves systemic infection with pathogens multiplying in the blood [2]. Blood cultures are mandatory to identify the causative organism and determine antibiotic sensitivity. **High-Yield Clinical Pearls for NEET-PG:** * **Enteric Fever Timeline:** Remember the mnemonic **BASU** for positive cultures: **B**lood (1st week), **A**gglutination/Widal (2nd week), **S**tool (3rd week), **U**rine (4th week). * **Bone Marrow Culture:** This is the most sensitive culture for Enteric fever, especially if the patient has already started antibiotics. * **Volume Matters:** For adult blood cultures, 10-20 ml of blood per bottle is recommended to optimize yield. * **Malaria Diagnosis:** Quantitative Buffy Coat (QBC) is a faster, fluorescent-based microscopic method, but peripheral smear remains the gold standard.

Q: Which of the following is not a feature of gastrinoma?

Massive HCl secretion in response to histamine injection. **Explanation:** Gastrinoma (Zollinger-Ellison Syndrome) is a neuroendocrine tumor that secretes excessive amounts of gastrin, leading to hyperchlorhydria [1]. **Why Option D is the Correct Answer:** In a normal individual, histamine stimulates parietal cells to secrete HCl. However, in Gastrinoma, the parietal cells are already **maximally stimulated** by the chronically high levels of endogenous gastrin. Therefore, the administration of exogenous histamine (or pentagastrin) fails to produce a significant further increase in acid output. This "refractoriness" to stimulation is a diagnostic hallmark, as the Basal Acid Output (BAO) is already very high, often exceeding 60% of the Maximal Acid Output (MAO). **Analysis of Incorrect Options:** * **Option A (Recurrent duodenal ulcer):** Excessive acid production leads to aggressive peptic ulcer disease. These ulcers are often refractory to standard therapy and frequently recur after treatment. * **Option B (Diarrhoea):** This occurs in ~50% of patients. It is caused by the high acid volume overwhelming the small intestine, inactivating pancreatic enzymes (leading to steatorrhea), and damaging the intestinal mucosa. * **Option C (Ulcer at unusual sites):** While most ZES ulcers are in the first part of the duodenum, ulcers in the distal duodenum or jejunum are highly suggestive of gastrinoma. **NEET-PG High-Yield Pearls:** * **Most common location:** The "Gastrinoma Triangle" (Passaro’s Triangle)—bounded by the cystic duct, junction of the 2nd and 3rd parts of the duodenum, and the neck of the pancreas. * **Best Initial Test:** Fasting Serum Gastrin (>1000 pg/mL is diagnostic). * **Most Sensitive Provocative Test:** Secretin Stimulation Test (Gastrin levels rise >200 pg/mL; in normal people, secretin inhibits gastrin). * **Association:** 25% of cases are associated with **MEN-1 syndrome** (3Ps: Pituitary, Parathyroid, Pancreas) [2].

Question 1

Which one of the following is not a feature of irritable bowel syndrome?

Accepted Answer

Rectal bleeding

Answer

Abdominal pain

Answer

Constipation

Answer

Bloating

Question 2

All of the following are true about refeeding syndrome except?

Accepted Answer

Occurs with TPN only, not seen in enteral nutrition

Answer

Associated with increased risk of arrhythmia

Answer

Occurs with rapid and excessive feeding of patients with severe underlying malnutrition

Answer

Hypophosphatemia and hypomagnesemia require treatment

Question 3

Which of the following lifestyle modifications should NOT be advised to a patient with GERD?

Accepted Answer

Ensuring the last meal is consumed within 2 hours of bedtime

Answer

Avoiding fatty, spicy foods, and chocolate

Answer

Eating small, frequent meals

Answer

Elevating the head end of the bed

Question 4

What is the most likely diagnosis in a 25-year-old male patient presenting with jaundice, a serum total bilirubin of 21 mg/dL, a direct bilirubin of 9.6 mg/dL, and an alkaline phosphatase of 84 KA units?

Accepted Answer

Obstructive jaundice

Answer

Hemolytic anemia

Answer

Viral hepatitis

Answer

Drug-induced hepatitis

Question 5

What is the mainstay of treatment for a patient with mild ulcerative colitis?

Accepted Answer

5-ASA agents

Answer

Corticosteroids

Answer

Azathioprine

Answer

Antibiotics

Question 6

A patient presents with lower gastrointestinal bleed. Sigmoidoscopy shows ulcers in the sigmoid. Biopsy from this area shows flask-shaped ulcers. Which of the following is the most appropriate treatment?

Accepted Answer

Intravenous metronidazole

Answer

Intravenous ceftriaxone

Answer

Intravenous steroids and sulphasalazine

Answer

Hydrocortisone enemas

Question 7

A 52-year-old male presents with persistent severe right upper quadrant pain for the past 2 hours, accompanied by nausea, diaphoresis, and pain in the posterior aspect of his right shoulder. The pain began shortly after consuming a meal. Ultrasound examination reveals multiple stones in an inflamed gallbladder with a normal bile duct. Which of the following spinal nerve segments are involved in the referred shoulder pain associated with cholecystitis?

Accepted Answer

T5 to T9

Answer

C3 to C5

Answer

C5 to C8

Answer

T1 to T4

Question 8

Blood culture is indicated in all the following conditions, except:

Accepted Answer

Malaria

Answer

Enteric fever

Answer

Subacute bacterial endocarditis

Answer

Septicemia

Question 9

A 56-year-old man with a history of heavy alcohol consumption is admitted with sudden massive hematemesis and hypotension. On examination, there is jaundice, spider angiomata, abdominal distension with shifting dullness, and edema. What is the most likely cause of gastrointestinal blood loss?

Accepted Answer

Esophageal varices

Answer

Mallory-Weiss tear

Answer

Aortoenteric fistula

Answer

Gastric ulcer

Question 10

Which of the following is not a feature of gastrinoma?

Accepted Answer

Massive HCl secretion in response to histamine injection

Answer

Recurrent duodenal ulcer

Answer

Diarrhoea

Answer

Ulcer at unusual sites

Gastroenterology — MCQs

Gastroenterology — MCQs

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