Gastroenterology Practice Questions

Q: Steroid refractory ulcerative colitis is defined as active disease despite treatment with which of the following regimens?

Prednisolone up to 0.75 mg/kg/day over 4 weeks. **Explanation:** In the management of Ulcerative Colitis (UC), defining steroid responsiveness is crucial for determining when to escalate to second-line therapies (like Infliximab or Cyclosporine). [1] **Steroid-refractory Ulcerative Colitis** is defined as the presence of active disease despite an adequate course of corticosteroids. According to standard clinical guidelines (including Harrison’s Principles of Internal Medicine and ECCO guidelines), this is specifically defined as: * **Prednisolone up to 0.75 mg/kg/day** (or equivalent) administered orally for a period of **4 weeks**. [1] * Alternatively, in acute severe cases, it refers to a lack of response to intravenous steroids (e.g., Hydrocortisone or Methylprednisolone) within 3–7 days. **Analysis of Options:** * **Option A (0.5 mg/kg):** This dose is considered sub-therapeutic for inducing remission in moderate-to-severe flares; therefore, failure at this dose does not meet the criteria for "refractory" disease. * **Option C & D (1 mg/kg or 1.5 mg/kg):** While 1 mg/kg is often used in clinical practice for various autoimmune conditions, the specific consensus definition for UC refractory status is pegged at the 0.75 mg/kg threshold to balance efficacy with the significant side-effect profile of higher doses. **High-Yield Clinical Pearls for NEET-PG:** * **Steroid-Dependent UC:** Disease that responds to steroids but relapses when the dose is tapered below 10 mg/day or within 3 months of stopping. * **First-line for Mild-Moderate UC:** Topical or oral 5-ASA (Mesalamine). [1] * **Indication for Surgery:** Toxic megacolon, perforation, or refractory disease. [1] * **Drug of Choice for Acute Severe UC (Steroid Refractory):** IV Cyclosporine or Infliximab ("Rescue therapy").

Q: What is the concentration of epinephrine used for injection therapy in the endoscopic management of actively bleeding peptic ulcers?

1 in 10,000. **Explanation:** The primary goal of endoscopic injection therapy in bleeding peptic ulcers is to achieve **hemostasis** through a combination of local vasoconstriction and mechanical tamponade. **Why 1:10,000 is the Correct Answer:** The standard concentration used globally is **1:10,000 (0.1 mg/mL)**. This concentration provides a potent vasoconstrictive effect on the bleeding vessel while minimizing systemic cardiovascular side effects. It is typically diluted in normal saline and injected in 0.5 mL to 2 mL aliquots around the ulcer base. The saline provides the volume necessary for **tamponade**, while the epinephrine induces local vasospasm and promotes platelet aggregation. **Analysis of Incorrect Options:** * **A (1:1,000):** This is the standard concentration for intramuscular injection in anaphylaxis. Using it endoscopically is dangerous as it can cause severe systemic absorption, leading to hypertensive crisis, arrhythmias, or myocardial ischemia. * **B (1:5,000):** While occasionally used in some surgical settings, it is considered too concentrated for routine endoscopic injection and increases the risk of local tissue necrosis and systemic toxicity. * **D (1:30,000):** This concentration is too dilute to provide effective local vasoconstriction required to stop active arterial spurting (Forrest Ia) or oozing (Forrest Ib). **High-Yield Clinical Pearls for NEET-PG:** * **Dual Therapy:** Epinephrine injection alone is less effective than "dual therapy." For high-risk ulcers, it should be combined with a second modality (e.g., thermal coagulation or mechanical clips) to prevent re-bleeding. * **Forrest Classification:** Injection therapy is indicated for **Forrest Ia (Spurting)**, **Ib (Oozing)**, and **IIa (Visible vessel)**. * **Volume:** Usually, 5–20 mL of the 1:10,000 solution is injected in total.

Q: Which of the following is considered an extra-intestinal manifestation of inflammatory bowel disease?

Osteoarthritis. The correct answer is **C. Osteoarthritis**. In the context of Inflammatory Bowel Disease (IBD), joint involvement is the most common extra-intestinal manifestation (EIM). However, the specific types of joint disease associated with IBD are **inflammatory** in nature, such as **Peripheral Arthritis** (Type I and Type II) and **Ankylosing Spondylitis** [1]. **Osteoarthritis** is a degenerative joint disease characterized by "wear and tear" of cartilage; it is not an immune-mediated manifestation of IBD. **Analysis of Options:** * **A. Uveitis:** A common ocular EIM of IBD (more frequent in Crohn’s) [2]. It presents with eye pain, photophobia, and blurred vision and requires urgent treatment to prevent blindness. * **B. Sclerosing Cholangitis:** Specifically **Primary Sclerosing Cholangitis (PSC)** is a classic hepatobiliary EIM, strongly associated with Ulcerative Colitis (UC). It is characterized by fibrotic strictures of the bile ducts. * **D. Skin Nodules:** These refer to **Erythema Nodosum**, the most common skin manifestation of IBD. They are painful, red nodules typically found on the pretibial surface (shins) and often correlate with bowel disease activity. **NEET-PG High-Yield Pearls:** 1. **Activity Correlation:** Erythema Nodosum and Type I Peripheral Arthritis (pauciarticular) usually parallel the activity of the intestinal inflammation [1]. 2. **Independence from Activity:** Ankylosing Spondylitis, Sacroiliitis, and Primary Sclerosing Cholangitis follow a course **independent** of the bowel disease activity [1]. 3. **HLA Association:** HLA-B27 is strongly linked to axial involvement (Ankylosing Spondylitis) in IBD patients [2]. 4. **Pyoderma Gangrenosum:** A more severe, necrotic skin ulceration associated with IBD (mostly UC) that does not always correlate with bowel activity.

Q: A patient is said to have chronic diarrhea if it is occurring for more than how many weeks?

4. **Explanation:** Diarrhea is clinically classified based on the duration of symptoms to help narrow down the differential diagnosis and guide management. * **The Correct Answer (B):** According to standard medical textbooks (Harrison’s Principles of Internal Medicine) and clinical guidelines, **chronic diarrhea** is defined as a decrease in stool consistency or an increase in frequency (typically >3 stools/day) lasting for **more than 4 weeks**. This duration is significant because most infectious causes (viral or bacterial) resolve within 2 to 4 weeks. Symptoms persisting beyond this point often indicate non-infectious etiologies like Malabsorption syndromes, Inflammatory Bowel Disease (IBD), or Irritable Bowel Syndrome (IBS). **Analysis of Incorrect Options:** * **Option A (3 weeks):** While some older texts used 3 weeks as a threshold, modern consensus (including the AGA and Harrison's) strictly defines chronic as >4 weeks. * **Options C & D (5 and 6 weeks):** These durations are unnecessarily long for the definition. By the 4-week mark, the condition is already classified as chronic, and diagnostic workups for underlying pathology should begin. **NEET-PG High-Yield Pearls:** 1. **Acute Diarrhea:** Lasts 4 weeks. 4. **Pseudodiarrhea:** Frequent passage of small volumes of stool (often associated with rectal urgency or IBS), not to be confused with true diarrhea which involves increased stool weight (>200g/day). 5. **Factitious Diarrhea:** A form of Munchausen syndrome where patients self-administer laxatives; it should be suspected in unexplained chronic diarrhea.

Q: Pigment gallstones are usually not seen in which of the following conditions?

Clofibrate therapy. The formation of gallstones depends on the composition of bile. Gallstones are broadly classified into **Cholesterol stones** and **Pigment stones** (Black or Brown) [1]. **Why Clofibrate therapy is the correct answer:** Clofibrate (and other fibrates) increases the risk of **cholesterol gallstones**, not pigment stones. Fibrates inhibit the enzyme *cholesterol 7α-hydroxylase*, which reduces bile acid synthesis. Simultaneously, they increase the activity of *HMG-CoA reductase*, leading to increased biliary cholesterol excretion. This results in supersaturation of bile with cholesterol, promoting the formation of cholesterol stones. **Analysis of Incorrect Options:** * **Gilbert’s Syndrome:** This condition involves a deficiency in glucuronosyltransferase, leading to increased levels of unconjugated bilirubin. Chronic hyperbilirubinemia promotes the precipitation of calcium bilirubinate, leading to **black pigment stones**. * **Alcoholic Cirrhosis:** Cirrhosis is a major risk factor for **pigment stones**. The mechanism involves hypersplenism (leading to hemolysis), decreased hepatic synthesis of bile salts, and impaired gallbladder motility. * **Cystic Fibrosis:** Patients with CF often develop **pigment stones** due to bile acid malabsorption in the terminal ileum and increased biliary calcium concentrations. **NEET-PG High-Yield Pearls:** * **Black Pigment Stones:** Associated with chronic hemolysis (e.g., Thalassemia, Hereditary Spherocytosis), Cirrhosis, and Gilbert’s syndrome. They are usually found in the gallbladder. * **Brown Pigment Stones:** Associated with biliary stasis and **infections** (e.g., *E. coli*, *Clonorchis sinensis*) [2]. They often form *de novo* in the bile ducts [2]. * **Risk Factors for Cholesterol Stones (The 4 F's):** Fat, Female, Fertile, Forty. * **Ileal Resection/Disease:** Leads to bile salt malabsorption, predisposing to cholesterol stones.

Q: A 60-year-old patient presents with bright red blood per rectum. The bleeding started abruptly several hours prior to visit. The patient reports lightheadedness when standing up rapidly but denies abdominal pain, cramping, fever, nausea, or vomiting. He has no history of previous bleeding or abdominal pain but has a history of coronary artery disease and takes aspirin. He is afebrile, slightly hypotensive and tachycardic, but hemodynamically stable. Examination reveals decreased skin turgor and dry mucous membranes. There is no abdominal tenderness. Rectal examination is positive for gross blood. What is the most likely diagnosis?

Arteriovenous malformation. ### Explanation The patient presents with **painless, acute, brisk hematochezia** (bright red blood per rectum) and signs of hypovolemia (orthostatic lightheadedness, tachycardia, dry mucous membranes) without abdominal pain. In an elderly patient, the two most common causes of such a presentation are **Diverticulosis** and **Arteriovenous Malformations (AVMs)/Angiodysplasia**. **Why Arteriovenous Malformation is correct:** AVMs are dilated, tortuous submucosal vessels most commonly found in the cecum and right colon of patients over 60 [1]. They typically cause **painless bleeding** that can range from occult to massive hematochezia [1]. The absence of abdominal pain and the patient's age strongly point toward a vascular cause. **Why the other options are incorrect:** * **Diverticulitis:** While diverticulosis causes painless bleeding, diverticulitis involves inflammation/infection and presents with **left lower quadrant pain**, fever, and altered bowel habits; it rarely causes significant bleeding. * **Infectious Colitis:** This typically presents with **fever, abdominal cramps, and diarrhea** (often mucoid or bloody), which are absent here. * **Ischemic Colitis:** This usually presents with the sudden onset of **crampy abdominal pain** followed by bloody diarrhea, often occurring at "watershed" areas (splenic flexure) during episodes of hypotension [2]. The lack of pain makes this unlikely. **Clinical Pearls for NEET-PG:** * **Most common cause of brisk LGIB in elderly:** Diverticulosis (painless). * **Second most common cause:** Angiodysplasia/AVM (painless). * **Heyde’s Syndrome:** The triad of Aortic Stenosis, GI bleeding from angiodysplasia, and acquired von Willebrand deficiency. * **Initial Management:** Hemodynamic stabilization with IV fluids is always the first step before diagnostic colonoscopy.

Question 1

A chronic alcoholic presents with regurgitation and retrosternal pain. Endoscopic biopsy confirms Barrett's oesophagus. What is the most appropriate management in this case?

Accepted Answer

Endoscopic biopsy every 2 years

Answer

Proton pump inhibitor (PPI)

Answer

Helicobacter pylori treatment

Answer

Balloon dilatation

Question 2

Steroid refractory ulcerative colitis is defined as active disease despite treatment with which of the following regimens?

Accepted Answer

Prednisolone up to 0.75 mg/kg/day over 4 weeks

Answer

Prednisolone up to 0.5 mg/kg/day over 4 weeks

Answer

Prednisolone up to 1 mg/kg/day over 4 weeks

Answer

Prednisolone up to 1.5 mg/kg/day over 4 weeks

Question 3

What is the concentration of epinephrine used for injection therapy in the endoscopic management of actively bleeding peptic ulcers?

Accepted Answer

1 in 10,000

Answer

1 in 1000

Answer

1 in 5000

Answer

1 in 30,000

Question 4

In the setting of cirrhosis and ascites, Spontaneous Bacterial Peritonitis (SBP) is best treated with cefotaxime injection. What is the next best oral alternative drug for its treatment?

Accepted Answer

Ofloxacin

Answer

Norfloxacin

Answer

Ciprofloxacin

Answer

Pefloxacin

Question 5

Which of the following is considered an extra-intestinal manifestation of inflammatory bowel disease?

Accepted Answer

Osteoarthritis

Answer

Uveitis

Answer

Sclerosing cholangitis

Answer

Skin nodules

Question 6

Diarrhoea with ulcer responding to PPI is seen in which of the following conditions?

Accepted Answer

Zollinger Ellison syndrome

Answer

MEN 1 syndrome

Answer

H. pylori infection

Answer

VIPoma

Question 7

Which of the following is NOT a cause of secretory diarrhea?

Accepted Answer

Lactose intolerance

Answer

Vibrio cholera

Answer

Inflammatory bowel disease

Answer

Gastrinoma

Question 8

A patient is said to have chronic diarrhea if it is occurring for more than how many weeks?

Accepted Answer

4

Answer

3

Answer

5

Answer

6

Question 9

Pigment gallstones are usually not seen in which of the following conditions?

Accepted Answer

Clofibrate therapy

Answer

Gilbert's syndrome

Answer

Alcoholic cirrhosis

Answer

Cystic fibrosis

Question 10

A 60-year-old patient presents with bright red blood per rectum. The bleeding started abruptly several hours prior to visit. The patient reports lightheadedness when standing up rapidly but denies abdominal pain, cramping, fever, nausea, or vomiting. He has no history of previous bleeding or abdominal pain but has a history of coronary artery disease and takes aspirin. He is afebrile, slightly hypotensive and tachycardic, but hemodynamically stable. Examination reveals decreased skin turgor and dry mucous membranes. There is no abdominal tenderness. Rectal examination is positive for gross blood. What is the most likely diagnosis?

Accepted Answer

Arteriovenous malformation

Answer

Diverticulitis

Answer

Infectious colitis

Answer

Ischemic colitis

Gastroenterology — MCQs

Gastroenterology — MCQs

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