Gastroenterology Practice Questions

Q: Which of the following statements about Gilbert syndrome is false?

Causes cirrhosis. ***Causes cirrhosis*** - **Gilbert syndrome** is a benign condition characterized by intermittent unconjugated hyperbilirubinemia and does **not lead to cirrhosis** [1]. - Cirrhosis is a severe form of **liver scarring** resulting from chronic damage, which is not a feature of Gilbert syndrome. *Normal liver histology* - The liver structure and function in individuals with Gilbert syndrome are typically **normal**, distinguishing it from other liver disorders [2]. - Histological examination of liver biopsies usually reveals no abnormalities, reflecting the **benign nature** of the condition. *Autosomal dominant* - Gilbert syndrome is inherited in an **autosomal recessive** pattern, not autosomal dominant [2]. - It results from a reduction in the activity of the **UGT1A1 enzyme**, which is responsible for bilirubin conjugation [1], [2]. *Elevated bilirubin levels are present* - Individuals with Gilbert syndrome experience **intermittent unconjugated hyperbilirubinemia**, meaning their indirect bilirubin levels are elevated [3]. - This elevation is usually mild and can be exacerbated by stress, fasting, or illness, but it is typically **harmless** [1], [2].

Q: Which of the following is a characteristic of Wilson's disease?

Increased copper in liver. ***Increased copper in liver*** - Wilson's disease is characterized by **accumulation of copper** in liver tissues due to defective copper transport [1]. - This excess leads to **hepatocellular damage**, resulting in liver dysfunction and potential cirrhosis [1]. *Decreased copper excretion in urine* - In Wilson's disease, there is actually **decreased excretion of copper**, which results in accumulation in the liver [1]. - **Urine copper levels** are typically low to normal in early stages because the liver fails to excrete excess copper effectively. *Autosomal dominant* - Wilson's disease is inherited in an **autosomal recessive** pattern, not dominant. - It is caused by mutations in the gene responsible for copper transport (ATP7B) [1]. *Increased serum ceruloplasmin* - Serum ceruloplasmin levels are often **decreased** in Wilson's disease due to impaired copper incorporation into this protein [1]. - Low ceruloplasmin is a key laboratory finding, contrasting the assertion of this option.

Q: What is the preferred test for confirming H. pylori eradication?

Urease breath test. ***Urease breath test*** - The **urea breath test** is highly sensitive and specific for detecting active *H. pylori* infection and its eradication by measuring radioactive or non-radioactive labeled carbon dioxide released from metabolizing urea. - It is a non-invasive test preferred after treatment to confirm eradication, as it directly detects bacterial urease activity. *Culture* - **Culture** requires an invasive endoscopic biopsy, is expensive, and takes several days to yield results; therefore, it is not the preferred method for routine eradication confirmation. - While it offers the advantage of **antibiotic susceptibility testing**, its invasiveness and turnaround time make it less practical for post-treatment assessment. *Serological test* - **Serological tests** (blood tests for antibodies) remain positive for **H. pylori antibodies** for extended periods even after successful eradication, rendering them unsuitable for confirming eradication. - These tests primarily indicate past exposure rather than current, active infection. *Biopsy urease test* - A **biopsy urease test** involves an invasive endoscopy to obtain a tissue sample, which is then tested for urease activity. - Although useful for initial diagnosis, its invasiveness makes it less preferred for confirming eradication compared to the non-invasive breath test.

Q: Corkscrew esophagus is seen in which of the following conditions ?

Diffuse esophagus spasm. ***Diffuse esophagus spasm*** - **Corkscrew esophagus** is a classic radiographic finding in **diffuse esophageal spasm (DES)**, indicating multiple simultaneous, non-peristaltic contractions. [1] - This condition is characterized by **uncoordinated esophageal contractions** that can lead to chest pain and dysphagia. [1] *Scleroderma* - Scleroderma typically causes **hypomotility** or aperistalsis in the esophagus, especially in the distal two-thirds, rather than a corkscrew appearance. [1] - It results from progressive **fibrosis and atrophy of the smooth muscle**, leading to esophageal dilation and reflux symptoms. [1] *Achalasia cardia* - Achalasia is defined by the **failure of the lower esophageal sphincter (LES) to relax** and loss of peristalsis in the esophageal body, leading to a "bird-beak" appearance on barium swallow. [2] - It features a **dilated esophagus** proximally to the tight LES, not multiple indentations. [2] *Carcinoma esophagus* - Esophageal carcinoma usually presents as a **focal stricture**, mass, or irregular lumen on imaging, often causing dysphagia that is progressive. - It does not typically cause the diffuse, segmental contractions characteristic of a corkscrew esophagus.

Q: Best provocative test for diagnosis of Gastrinoma is:

Secretin injection test. ***Secretin injection test*** - The **secretin injection test** is the most reliable provocative test for gastrinoma, leading to a paradoxical increase in gastrin levels [1]. - In normal individuals, secretin suppresses gastrin release, but in gastrinoma, it stimulates **gastrin secretion** [1]. *Ca++ infusion test* - The **calcium infusion test** can also stimulate gastrin release in gastrinoma patients, but it is less specific and potentially more risky than the secretin test due to potential side effects like cardiac arrhythmias. - It involves infusing calcium gluconate to observe any uncharacteristic rise in gastrin. *ACTH stimulation test* - The **ACTH stimulation test** is used to evaluate adrenal gland function, particularly in suspected cases of adrenal insufficiency or hypercortisolism [2]. - It does not have any direct relevance to the diagnosis of **gastrinoma**. *Steroid assay* - **Steroid assays** measure levels of various steroid hormones (e.g., cortisol, aldosterone) in the body to assess adrenal or gonadal function. - This test is not used for diagnosing **gastrinoma**.

Q: Secretory diarrhea is not typically associated with which of the following conditions?

Celiac disease. ***Celiac disease*** [1] - Characterized by **malabsorption** due to immune-mediated damage to the intestinal mucosa, leading to **osmotic diarrhea** rather than secretory diarrhea [1]. - Symptoms include **bloating**, **weight loss**, and **steatorrhea**, which are not consistent with secretory processes. *Cholera* - Caused by **Vibrio cholerae**, leading to **massive secretory diarrhea** due to the action of cholera toxin on intestinal epithelial cells. - Presents with **watery diarrhea**, potentially leading to **dehydration** and electrolyte imbalances. *Addison's Disease* - This condition may cause **diarrhea** but typically results in **non-secretory diarrhea**, often associated with adrenal insufficiency symptoms. - Presenting features include **fatigue**, **weight loss**, and **hyperpigmentation**, not primarily secretory processes. *Phenolphthalein* - A laxative that can induce **secretory diarrhea** through its stimulant effects on the bowel. - Its mechanism leads to increased fluid secretion in the intestines, thus contributing to secretory diarrhea.

Q: Esophageal manometry is useful in diagnosing all of the following conditions EXCEPT:

Malignancy (not typically diagnosed with this test). ***Malignancy (not typically diagnosed with this test)*** - **Esophageal manometry** evaluates the **motor function** of the esophagus, measuring pressure changes during swallowing. - **Malignancy**, such as esophageal cancer, is primarily diagnosed with **endoscopy with biopsy** and imaging studies, not by assessing motility. *Achalasia (a motility disorder)* - **Esophageal manometry** is the **gold standard** for diagnosing achalasia, characterized by **absent peristalsis** in the esophageal body and **incomplete relaxation of the lower esophageal sphincter (LES)** [1]. - High-resolution manometry shows elevated **integrated relaxation pressure (IRP)** and often pan-esophageal pressurization. *Diffuse esophageal spasm (a motility disorder)* - This condition is also diagnosed by **esophageal manometry**, which reveals simultaneous, **non-peristaltic contractions** of high amplitude, often interspersed with normal peristalsis [1]. - It may also show **premature contractions** and **multiple rapid swallows** triggering spasm. *Assessment of esophageal motility prior to surgery for GERD* - **Manometry** is routinely performed before **anti-reflux surgery (e.g., Nissen fundoplication)** to rule out underlying esophageal motility disorders that could complicate surgery or worsen symptoms post-operatively [1]. - Identifying conditions like **achalasia** or **scleroderma** would contraindicate a standard fundoplication, as dysphagia could worsen [1].

Q: Which of the following is a characteristic feature of Crohn's disease?

Sinus & fistula. ***Sinus & fistula*** - **Transmural inflammation**, a hallmark of Crohn's disease, can extend through the bowel wall, leading to the formation of **sinus tracts** and **fistulae** (abnormal connections between organs or to the skin). [1] - These complications include enteroenteric, enterovesical, and perianal fistulae, which are highly characteristic of Crohn's. [1] *Continuous involvement* - Crohn's disease is characterized by **skip lesions**, meaning there are healthy segments of bowel interspersed with diseased segments, not continuous involvement. [1] - **Ulcerative colitis** typically presents with continuous inflammation, starting from the rectum and extending proximally. [1] *Mesenteric lymphadenitis* - While mesenteric lymph nodes can be involved in Crohn's disease due to inflammation, **mesenteric lymphadenitis** is more commonly associated with infectious etiologies or other inflammatory conditions, and not a primary defining characteristic. - It refers to inflammation of lymph nodes in the mesentery, which can cause abdominal pain but does not specifically differentiate Crohn's from other conditions. *Crypt abscesses* - **Crypt abscesses** are a characteristic histological feature of **ulcerative colitis**, where neutrophils infiltrate the glandular crypts. [1] - While they can occasionally be seen in Crohn's, they are much more common and prominent in ulcerative colitis and are not a defining feature of Crohn's.

Q: Which type of fatty acids should be included in the diet to manage chyluria?

Medium-chain fatty acids. ***Medium-chain fatty acids*** - **Medium-chain fatty acids (MCFAs)** are absorbed directly into the **portal circulation** without being re-esterified to triglycerides or incorporated into chylomicrons [1]. This helps bypass the compromised lymphatic system. - In **chyluria**, the lymphatic system's integrity is disrupted, leading to leakage of **chyle** (lymphatic fluid rich in chylomicrons) into the urinary tract. MCFAs provide a source of fat that does not rely on the lymphatic pathway for transport [1]. *Short-chain fatty acids* - **Short-chain fatty acids (SCFAs)** are primarily produced by bacterial fermentation in the colon and are absorbed directly into the portal circulation. - While they do not rely on the lymphatic system, their dietary contribution as a significant energy source is limited, and they are not the primary fat source for patients with chyluria. *Long-chain fatty acids* - **Long-chain fatty acids (LCFAs)** are absorbed with the help of bile salts, re-esterified into triglycerides, and packaged into **chylomicrons** within the intestinal cells [2]. - These chylomicrons then enter the **lymphatic system** and eventually the bloodstream, which is precisely the pathway that is compromised in chyluria, making them unsuitable [2]. *Omega-3 fatty acids* - **Omega-3 fatty acids** are a type of **long-chain polyunsaturated fatty acid** that also follow the chylomicron-lymphatic pathway for absorption [3]. - While beneficial for other health aspects, they are not suitable for managing chyluria due to their reliance on the **lymphatic system** for transport, which is dysfunctional in this condition.

Question 1

Which of the following statements about Gilbert syndrome is false?

Accepted Answer

Causes cirrhosis

Answer

Normal liver histology

Answer

Autosomal dominant

Answer

Elevated bilirubin levels are present

Question 2

What is a feature of short bowel syndrome?

Accepted Answer

Malabsorption leading to diarrhea, dehydration, and malnutrition.

Answer

Hypergastrinemia & high gastric secretion is seen

Answer

Diarrhea, dehydration and malnutrition

Answer

Chronic TPN dependence

Question 3

Which of the following is a characteristic of Wilson's disease?

Accepted Answer

Increased copper in liver

Answer

Autosomal dominant

Answer

Increased serum ceruloplasmin

Answer

Decreased copper excretion in urine

Question 4

What is the preferred test for confirming H. pylori eradication?

Accepted Answer

Urease breath test

Answer

Culture

Answer

Serological test

Answer

Biopsy urease test

Question 5

Corkscrew esophagus is seen in which of the following conditions ?

Accepted Answer

Diffuse esophagus spasm

Answer

Scleroderma

Answer

Achalasia cardia

Answer

Carcinoma esophagus

Question 6

Best provocative test for diagnosis of Gastrinoma is:

Accepted Answer

Secretin injection test

Answer

Ca++ infusion test

Answer

ACTH stimulation test

Answer

Steroid assay

Question 7

Secretory diarrhea is not typically associated with which of the following conditions?

Accepted Answer

Celiac disease

Answer

Phenolphthalein

Answer

Cholera

Answer

VIPoma

Question 8

Esophageal manometry is useful in diagnosing all of the following conditions EXCEPT:

Accepted Answer

Malignancy (not typically diagnosed with this test)

Answer

Achalasia (a motility disorder)

Answer

Diffuse esophageal spasm (a motility disorder)

Answer

Assessment of esophageal motility prior to surgery for GERD

Question 9

Which of the following is a characteristic feature of Crohn's disease?

Accepted Answer

Sinus & fistula

Answer

Mesenteric lymphadenitis

Answer

Continuous involvement

Answer

Crypt abscesses

Question 10

Which type of fatty acids should be included in the diet to manage chyluria?

Accepted Answer

Medium-chain fatty acids

Answer

Short-chain fatty acids

Answer

Long-chain fatty acids

Answer

Omega-3 fatty acids

Gastroenterology — MCQs

Gastroenterology — MCQs

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