Gastroenterology Practice Questions

Q: Pseudoachalasia is associated with all of the following conditions EXCEPT?

Rosary esophagus. **Explanation:** **Pseudoachalasia** (also known as secondary achalasia) is a clinical condition that mimics the clinical, manometric, and radiographic features of primary achalasia (e.g., failure of LES relaxation and aperistalsis) [1]. However, unlike primary achalasia, which is idiopathic, pseudoachalasia is caused by an underlying secondary process—most commonly a malignancy [2]. **Why "Rosary Esophagus" is the correct answer:** **Rosary esophagus** (or "corkscrew esophagus") is the classic radiographic finding on a barium swallow for **Diffuse Esophageal Spasm (DES)** [1]. DES is a primary motility disorder characterized by high-amplitude, non-peristaltic contractions. It is a distinct entity and is not a cause or feature of pseudoachalasia. **Analysis of incorrect options:** * **Esophageal tumor & Carcinoma of the gastric fundus:** These are the most common causes of pseudoachalasia. Malignant infiltration of the esophageal wall or the myenteric (Auerbach’s) plexus at the gastroesophageal junction leads to mechanical obstruction and impaired relaxation of the LES [2]. * **Paraneoplastic syndrome:** Certain malignancies (notably small cell lung cancer) can cause pseudoachalasia via a paraneoplastic mechanism, where antibodies (like anti-Hu) attack the esophageal neurons, mimicking the idiopathic disease [2]. **Clinical Pearls for NEET-PG:** * **Red Flags for Pseudoachalasia:** Age >60 years, rapid weight loss, and short duration of symptoms (<6 months). Primary achalasia usually presents in younger patients with a more chronic course. * **Diagnostic Clue:** If an endoscope cannot pass through the LES easily ("pop" sensation), it suggests primary achalasia; if there is a fixed, rigid narrowing, suspect pseudoachalasia (malignancy) [2]. * **Chagas Disease:** Caused by *Trypanosoma cruzi*, this is another cause of secondary achalasia (common in South America).

Q: All are complications of ulcerative colitis, except?

Fistula formation. **Explanation:** The key to answering this question lies in understanding the depth of inflammation in Inflammatory Bowel Disease (IBD). **Why Fistula formation is the correct answer:** Fistulae are abnormal communications between two epithelial-lined surfaces. They occur when inflammation is **transmural** (involving all layers of the bowel wall). **Ulcerative Colitis (UC)** is characterized by superficial inflammation limited to the **mucosa and submucosa**. Therefore, it does not typically lead to fistula or abscess formation. In contrast, fistula formation is a hallmark complication of **Crohn’s Disease**, where inflammation is transmural. **Analysis of incorrect options:** * **Hemorrhage:** Since UC involves diffuse mucosal ulceration and vascular engorgement (friability), bloody diarrhea and significant gastrointestinal hemorrhage are very common. * **Stricture:** While less common than in Crohn’s, strictures do occur in UC. However, a stricture in UC is considered **malignant until proven otherwise**, as it often signifies underlying adenocarcinoma. * **Malignant change:** Patients with long-standing UC (usually >8–10 years) have a significantly increased risk of developing **Colorectal Carcinoma**. The risk correlates with the duration and anatomical extent of the disease (pancolitis > left-sided colitis). **High-Yield Clinical Pearls for NEET-PG:** * **Toxic Megacolon:** A life-threatening complication of UC where the colon dilates (>6 cm) due to neuromuscular paralysis. * **Extraintestinal Manifestations:** Primary Sclerosing Cholangitis (PSC) is more specifically associated with UC than Crohn’s. * **Lead Pipe Appearance:** Seen on barium enema in chronic UC due to loss of haustrations. * **Surgery:** Proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA) is the gold standard curative surgery for UC.

Q: What is true about Crigler-Najjar syndrome type II?

Inherited as a recessive trait. Crigler-Najjar Syndrome (CNS) is a rare genetic disorder characterized by non-hemolytic unconjugated hyperbilirubinemia due to a deficiency of the enzyme **UDP-glucuronosyltransferase (UGT1A1)** [1]. **1. Why Option B is Correct:** Crigler-Najjar Type II (also known as **Arias Syndrome**) is inherited as an **autosomal recessive** trait (though some rare cases show dominant inheritance with variable penetrance). It involves a partial deficiency of UGT1A1, with enzyme activity typically <10% of normal [1]. **2. Analysis of Incorrect Options:** * **Option A:** CNS Type II is associated with a deficiency of **monoglucuronides** and **diglucuronides** (conjugated bilirubin), leading to a rise in unconjugated bilirubin [2]. * **Option C:** Kernicterus (bilirubin encephalopathy) is **rare** in Type II because bilirubin levels usually stay between 6–20 mg/dL. In contrast, Kernicterus is common and often fatal in **CNS Type I**, where bilirubin levels exceed 20–50 mg/dL [1]. * **Option D:** Phenobarbital is the **mainstay of treatment** for Type II. It acts as an enzyme inducer, stimulating the residual UGT1A1 activity and reducing serum bilirubin by 25% or more [2]. In Type I, Phenobarbital has no effect because enzyme activity is completely absent [1]. **High-Yield Clinical Pearls for NEET-PG:** * **CNS Type I:** Autosomal Recessive; 0% enzyme activity; No response to Phenobarbital; Treatment: Phototherapy, Plasmapheresis, Liver Transplant [1]. * **CNS Type II:** Autosomal Recessive; <10% enzyme activity; **Responds to Phenobarbital** [1]. * **Gilbert Syndrome:** Most common hereditary hyperbilirubinemia; ~30% enzyme activity; triggered by stress/fasting [1].

Q: Which of the following can be done in obstructive jaundice?

Vitamin K injections. In obstructive jaundice, the flow of bile into the duodenum is blocked (e.g., due to gallstones or malignancy). Since bile salts are essential for the emulsification and absorption of fat-soluble vitamins (**A, D, E, and K**), their absence leads to malabsorption [1]. **Explanation of the Correct Option:** * **Vitamin K Injections:** Vitamin K is a fat-soluble vitamin required for the hepatic synthesis of clotting factors **II, VII, IX, and X**. In obstructive jaundice, the lack of intestinal bile leads to Vitamin K deficiency, resulting in a prolonged Prothrombin Time (PT) and an increased risk of bleeding. Administering parenteral (injection) Vitamin K bypasses the malabsorption issue, corrects the coagulopathy, and is a standard preoperative step before any surgical intervention in these patients [1]. **Explanation of Incorrect Options:** * **Vitamin C Injections:** Vitamin C is a water-soluble vitamin. Its absorption is independent of bile salts; therefore, deficiency is not a characteristic feature of obstructive jaundice. * **Dehydration Therapy:** Patients with obstructive jaundice are actually at high risk for **hepatorenal syndrome**. They require aggressive hydration (pre-procedure) to maintain renal perfusion and prevent acute kidney injury, rather than dehydration therapy. **High-Yield Clinical Pearls for NEET-PG:** * **Kone’s Test:** If PT improves after parenteral Vitamin K, the jaundice is **obstructive** (surgical). If PT does not improve, it suggests **parenchymal liver disease** (medical), as the liver cannot utilize the vitamin [1]. * **Courvoisier’s Law:** In the presence of jaundice, a palpable gallbladder is usually not due to stones but due to malignant obstruction (e.g., Periampullary carcinoma). * **Pruritus** in obstructive jaundice is primarily due to the deposition of bile salts in the skin.

Q: Which of the following variables does NOT predict survival in a patient with primary sclerosing cholangitis?

Presence of AMA in high titre. **Explanation:** The correct answer is **C. Presence of AMA in high titre.** **Primary Sclerosing Cholangitis (PSC)** is a chronic cholestatic liver disease characterized by fibrosing inflammation of the intrahepatic and extrahepatic bile ducts [1]. Unlike Primary Biliary Cholangitis (PBC), where **Anti-Mitochondrial Antibodies (AMA)** are a hallmark diagnostic marker (found in >95% of cases), AMA is typically **absent** in PSC [2]. Therefore, its presence or titre does not correlate with the disease process or predict survival in PSC patients. **Analysis of Incorrect Options:** * **Serum Bilirubin Level:** This is one of the most potent predictors of survival. Rising bilirubin indicates progressive cholestasis and deteriorating liver function; it is a core component of the Mayo PSC Risk Score. * **Splenomegaly:** The presence of an enlarged spleen signifies the development of portal hypertension, a late-stage complication that indicates a poorer prognosis and reduced survival. * **Histologic Stage:** Liver biopsy findings (Stages I-IV) are predictive. Advanced stages (Stage III: Septal fibrosis; Stage IV: Cirrhosis) are associated with significantly shorter survival times compared to early-stage disease. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** MRCP (shows "beaded appearance" of bile ducts). * **Strongest Association:** Approximately 70-80% of PSC patients have **Ulcerative Colitis** [1]. * **Antibody Marker:** p-ANCA is often positive in PSC (60-80%), though not specific [1]. * **Malignancy Risk:** PSC patients have a high risk of **Cholangiocarcinoma** and Colorectal Cancer. * **Mayo Risk Score Variables:** Age, Bilirubin, Albumin, AST, and history of Variceal Bleeding.

Question 1

Which of the following statements regarding peptic ulcer disease is true?

Accepted Answer

Helicobacter pylori infection is known to increase the incidence of gastric ulcers.

Answer

Anterior ulcers bleed more commonly than posterior ulcers.

Answer

Posteriorly perforated ulcers always require conservative management.

Answer

Anti-Helicobacter pylori drugs must always be included in the treatment regimen for peptic ulcer disease.

Question 2

Pseudoachalasia is associated with all of the following conditions EXCEPT?

Accepted Answer

Rosary esophagus

Answer

Esophageal tumor

Answer

Paraneoplastic syndrome

Answer

Carcinoma of the gastric fundus

Question 3

Duodenal ulcer is most commonly caused by:

Accepted Answer

H. pylori

Answer

GERD

Answer

NSAID therapy

Answer

Stress ulcer

Question 4

All are complications of ulcerative colitis, except?

Accepted Answer

Fistula formation

Answer

Hemorrhage

Answer

Stricture

Answer

Malignant change

Question 5

Which of the following is NOT useful for the management of severe Clostridium difficile infection?

Accepted Answer

Neomycin enema

Answer

Intravenous metronidazole

Answer

Fecal transplant

Answer

Tigecycline

Question 6

What is the treatment of choice for Zollinger Ellison syndrome (ZES)?

Accepted Answer

Proton pump inhibitors (PPIs)

Answer

Somatostatin analogues

Answer

Streptozocin

Answer

Sucralfate

Question 7

What is true about Crigler-Najjar syndrome type II?

Accepted Answer

Inherited as a recessive trait

Answer

Associated with diglucuronide deficiency

Answer

Kernicterus is commonly seen

Answer

Phenobarbital is not useful in management

Question 8

Secretory diarrhea is not seen in which of the following conditions?

Accepted Answer

Celiac disease

Answer

Magnesium injection

Answer

Cholera

Answer

Ulcerative colitis

Question 9

Which of the following can be done in obstructive jaundice?

Accepted Answer

Vitamin K injections

Answer

Vitamin C injections

Answer

Dehydration therapy

Answer

All of the above

Question 10

Which of the following variables does NOT predict survival in a patient with primary sclerosing cholangitis?

Accepted Answer

Presence of AMA in high titre

Answer

Serum bilirubin level

Answer

Splenomegaly

Answer

Histologic stage

Gastroenterology — MCQs

Gastroenterology — MCQs

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