Gastroenterology Practice Questions

Q: Diffuse esophageal spasm is best diagnosed by which of the following investigations?

Manometry. **Explanation:** **Diffuse Esophageal Spasm (DES)**, now often referred to as Distal Esophageal Spasm, is a primary motility disorder characterized by uncoordinated, non-peristaltic contractions of the esophageal body. **Why Manometry is the Correct Answer:** High-resolution manometry is the **gold standard** for diagnosing esophageal motility disorders [1]. It provides a definitive physiological assessment of esophageal pressure and coordination. In DES, manometry classically reveals simultaneous, multi-peaked, high-amplitude contractions [2]. The diagnostic hallmark on modern manometry is a **Distal Latency (DL) of <4.5 seconds** in at least 20% of swallows, indicating premature contractions. **Analysis of Incorrect Options:** * **Endoscopy (A):** Usually appears normal in DES. Its primary role is to rule out structural lesions like malignancy or esophagitis (pseudo-achalasia) [1]. * **Barium Swallow (C):** While it may show the classic **"Corkscrew esophagus"** or "Rosary bead" appearance due to tertiary contractions, this is only present in about 50% of patients. It is suggestive but not diagnostic. * **CT Scan (D):** This is an imaging modality for structural abnormalities (e.g., tumors, lymphadenopathy) and has no role in diagnosing functional motility disorders. **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Intermittent chest pain (mimicking angina) and dysphagia to both solids and liquids, often triggered by cold liquids or stress [2]. * **Radiology:** "Corkscrew esophagus" on Barium swallow. * **Treatment:** First-line includes Nitrates or Calcium Channel Blockers (CCBs) to relax smooth muscle [2]. Endoscopic Botox injection or Peroral Endoscopic Myotomy (POEM) are considered in refractory cases. * **Key Differentiator:** Unlike Achalasia, the Lower Esophageal Sphincter (LES) relaxation is usually normal in DES.

Q: An elderly male presents to the Emergency Department following a bout of prolonged vomiting with excessive haematemesis after alcohol ingestion. What is the most likely diagnosis?

Mallory-Weiss syndrome. **Explanation:** The clinical presentation of hematemesis following repeated episodes of forceful vomiting or retching, particularly after alcohol consumption, is the classic hallmark of **Mallory-Weiss Syndrome (MWS)**. **1. Why Mallory-Weiss Syndrome is correct:** MWS involves a longitudinal mucosal laceration (tear) at the gastroesophageal junction or distal esophagus. The underlying mechanism is a sudden increase in intra-abdominal pressure (due to vomiting, retching, or coughing) against a closed glottis. In this case, the alcohol ingestion led to vomiting, which subsequently caused the tear and the "excessive hematemesis." **2. Why other options are incorrect:** * **Oesophageal Varices:** While common in alcoholics with cirrhosis, variceal bleeding usually presents as sudden, massive, painless hematemesis *without* the preceding history of non-bloody vomiting. * **Gastric Cancer:** This typically presents with chronic symptoms like weight loss, anorexia, and coffee-ground emesis or melena, rather than acute post-emetic hematemesis. * **Bleeding Disorder:** While it can exacerbate bleeding, it would not explain the specific sequence of vomiting followed by hematemesis. **3. NEET-PG High-Yield Pearls:** * **Location:** Most tears (75%) occur in the gastric mucosa just below the GE junction. * **Diagnosis:** The gold standard is **Upper GI Endoscopy**, which reveals linear mucosal tears. * **Management:** Most cases (approx. 90%) stop bleeding spontaneously with supportive care (IV fluids, PPIs). If persistent, endoscopic therapy (clipping or epinephrine injection) is used. * **Boerhaave Syndrome vs. MWS:** Boerhaave is a *transmural* perforation (full thickness) presenting with severe chest pain and pneumomediastinum (Mackler’s triad), whereas MWS is a *mucosal* tear presenting with bleeding.

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: 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: Which of the following is NOT a feature of Wilson's disease?

Pronounced sensory changes. **Explanation:** Wilson’s Disease (Hepatolenticular Degeneration) is an autosomal recessive disorder caused by mutations in the **ATP7B gene**, leading to impaired biliary copper excretion and systemic copper accumulation, primarily in the liver and the basal ganglia [1]. **Why "Pronounced sensory changes" is the correct answer:** Wilson’s disease is primarily a **motor disorder**. Copper deposition occurs predominantly in the basal ganglia (especially the putamen). While it causes significant motor symptoms like tremors, dystonia, and parkinsonism, it **spares the sensory pathways** [1]. The presence of pronounced sensory loss should prompt a clinician to look for alternative diagnoses, such as Vitamin B12 deficiency or multiple sclerosis. **Analysis of Incorrect Options:** * **Sunflower Cataract:** This is a classic ocular sign of copper deposition in the lens. Unlike Kayser-Fleischer (KF) rings (which occur in Descemet's membrane), sunflower cataracts typically do not interfere with vision. * **Tremors:** These are a hallmark neurological manifestation. The most characteristic is the "wing-beating" tremor, though resting or intention tremors are also common [1]. * **Renal Calculi:** Copper toxicity can cause **Fanconi Syndrome** (proximal renal tubular acidosis). This leads to hypercalciuria and hyperphosphaturia, which predisposes patients to the formation of renal stones [1]. **NEET-PG High-Yield Pearls:** * **Screening Test:** Serum Ceruloplasmin (usually 250 μg/g dry weight of copper). * **Most Sensitive Ocular Sign:** KF Ring (seen in >98% of neurological cases). * **Treatment:** Chelators (D-Penicillamine, Trientine) or Zinc (blocks intestinal absorption).

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

Diffuse esophageal spasm is best diagnosed by which of the following investigations?

Accepted Answer

Manometry

Answer

Endoscopy

Answer

Barium swallow

Answer

CT scan

Question 2

An elderly male presents to the Emergency Department following a bout of prolonged vomiting with excessive haematemesis after alcohol ingestion. What is the most likely diagnosis?

Accepted Answer

Mallory-Weiss syndrome

Answer

Oesophageal varices

Answer

Gastric cancer

Answer

Bleeding disorder

Question 3

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 4

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 5

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 6

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 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

Which of the following is NOT a feature of Wilson's disease?

Accepted Answer

Pronounced sensory changes

Answer

Sunflower Cataract

Answer

Tremors

Answer

Renal Calculi may be seen

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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