Gastroenterology Practice Questions

Q: Blood group most commonly associated with gastric carcinoma is

Blood group A. ***Blood group A*** - Individuals with **blood group A** have been statistically shown to have a higher risk of developing **gastric carcinoma**. - This association is thought to be related to the presence of **A antigens**, which may influence cell adhesion and immune response in the gastric mucosa. *Blood Group O* - Blood group O is more commonly associated with an increased risk of **peptic ulcer disease**, particularly **duodenal ulcers**. - It does not show a strong positive correlation with the development of gastric carcinoma. *Blood group AB* - Blood group AB is the rarest blood type and the association with gastric carcinoma risk is not as significant or well-established compared to blood group A. - While showing some increased risk, it is less pronounced than for blood group A. *Blood group B* - Individuals with blood group B do not show a significant or commonly acknowledged increased risk for gastric carcinoma. - Research has not identified a strong correlation between blood group B and the development of this type of cancer.

Q: Which of the following is the first-line treatment for Wilson's disease?

Penicillamine. ***Penicillamine*** - **Penicillamine** is the **traditional first-line treatment** for Wilson's disease according to international guidelines (AASLD, EASL) and standard medical practice. - It is a **copper chelator** that binds to copper and promotes its urinary excretion, effectively reducing copper accumulation in tissues. - It is used for both **initial treatment** of symptomatic patients (hepatic or neurological) and for **presymptomatic patients**. - Common side effects include early hypersensitivity reactions, bone marrow suppression, proteinuria, and late autoimmune phenomena, but it remains the most widely used first-line agent. *Trientine* - **Trientine** is a **second-line copper chelator** used when patients are **intolerant to penicillamine** or develop adverse effects. - It has a **better safety profile** than penicillamine with fewer side effects, but is reserved as an alternative rather than initial therapy. - It works similarly by chelating copper and promoting urinary excretion. *Zinc acetate* - **Zinc acetate** is primarily used for **maintenance therapy** in stable patients or for **presymptomatic patients** detected through family screening. - It works by **blocking intestinal copper absorption** by inducing metallothionein in enterocytes. - It is **not effective for initial treatment** of symptomatic patients as it does not remove existing copper stores and takes months to be effective. *Deferasirox* - **Deferasirox** is an **iron chelator** used to treat iron overload in conditions like thalassemia major. - It has **no role in Wilson's disease**, which involves copper overload, not iron.

Q: Autoimmune gastritis is associated with a deficiency of which vitamin?

Vitamin B12. ***B12*** - Autoimmune gastritis leads to destruction of **parietal cells** in the stomach, impairing intrinsic factor production, crucial for vitamin B12 absorption [2]. - Vitamin B12 deficiency can lead to **megaloblastic anemia** and neurological complications due to its key role in DNA synthesis and nerve function [1]. *C* - Vitamin C deficiency is associated with **scurvy**, which is unrelated to autoimmune gastritis and is not a consequence of gastric issues. - This vitamin primarily concerns skin health, collagen synthesis, and immune function, making it irrelevant in this context. *A* - Vitamin A deficiency is associated with **vision problems** and immune function, but it does not have a direct link to autoimmune gastritis. - Unlike B12, vitamin A is not specifically affected by the gastric conditions related to autoimmune processes. *D* - Vitamin D deficiency relates to **bone health** and calcium metabolism, and is not connected to the effects of autoimmune gastritis. - This vitamin's absorption primarily occurs in the intestines rather than involving gastric intrinsic factor or parietal cells.

Q: Gold standard investigation for chronic pancreatitis?

Endoscopic Retrograde Cholangiopancreatography (ERCP). ***Endoscopic Retrograde Cholangiopancreatography (ERCP)*** - ERCP is considered the **gold standard** for diagnosing chronic pancreatitis due to its ability to directly visualize the pancreatic duct system and detect subtle changes [1]. - It allows for direct imaging of ductal abnormalities like **strictures**, **dilatations**, and **calculi**, which are characteristic of chronic pancreatitis [1]. *MRI (Magnetic Resonance Imaging)* - While MRI, particularly **MRCP (Magnetic Resonance Cholangiopancreatography)**, is excellent for visualizing the pancreatic duct, it is generally less sensitive than ERCP for early or subtle changes in chronic pancreatitis [1]. - It is a **non-invasive** imaging technique but lacks the therapeutic and detailed ductal visualization capabilities of ERCP [1]. *Endoscopic Ultrasound (EUS)* - EUS is highly sensitive for detecting early parenchymal and ductal changes in chronic pancreatitis, such as **lobularity**, **stranding**, and small calculi. - Although it has high sensitivity, it is not considered the gold standard due to its operator dependence and inability to directly intervene or provide detailed ductal morphology as precisely as ERCP. *Pancreatic function tests* - Pancreatic function tests, such as the **secretin stimulation test**, assess the **exocrine function** of the pancreas by measuring enzyme or bicarbonate output [1]. - These tests are **indirect measures** of pancreatic damage and do not provide anatomical information about the pancreatic duct or parenchyma, making them less definitive for diagnosis compared to imaging [1].

Q: What is the primary cause of dumping syndrome?

Rapid gastric emptying. ***Rapid gastric emptying*** - **Rapid gastric emptying** means food moves too quickly from the stomach into the small intestine, leading to the characteristic symptoms of dumping syndrome [1]. - This quick transit of undigested food into the small intestine is often a consequence of gastric surgery where the normal regulatory mechanisms of the pyloric sphincter are disrupted. *Presence of hypertonic content in small intestine* - While the presence of **hypertonic content** in the small intestine is a *consequence* of rapid gastric emptying and contributes to the symptoms, it is not the primary cause of dumping syndrome itself. - The rapid entry of hypertonic chyme from the stomach into the small intestine draws fluid into the intestinal lumen, causing distension and contributing to many of the symptoms [1]. *Increased intestinal motility* - **Increased intestinal motility** can be a *symptom* or *secondary effect* of dumping syndrome, particularly in the later phase due to hormonal responses, but it is not the primary mechanism initiating the syndrome. - The rapid influx of food triggers various physiological responses, which can include changes in bowel movements. *Reduced gastric capacity* - **Reduced gastric capacity**, often a result of gastric surgery, can *contribute* to rapid gastric emptying by limiting the stomach's ability to hold and gradually release food. - However, it is a precursor state that facilitates rapid emptying rather than being the direct mechanism of dumping syndrome.

Q: A 14-year-old boy presents with recurrent episodes of hepatitis. Ophthalmoscopic evaluation reveals KF rings and serum ceruloplasmin levels are < 20 mg/dl. What is the treatment of choice for initial therapy?

Penicillamine. ***Penicillamine*** - **Penicillamine** is a **chelating agent** that promotes the excretion of copper from the body, making it the **treatment of choice** for initial therapy in symptomatic Wilson's disease. - The presence of **Kayser-Fleischer (KF) rings** and **low serum ceruloplasmin** in a patient with recurrent hepatitis are classic diagnostic features of **Wilson's disease** [1]. *Zinc* - **Zinc** acts by inducing **metallothionein** in enterocytes, which binds dietary copper and prevents its absorption, promoting fecal excretion. - While used in Wilson's disease, especially for maintenance therapy or in asymptomatic individuals, it is generally considered a **slower-acting agent** and less effective for initial treatment of symptomatic patients who require rapid copper mobilization. *Tetrathiomolybdate* - **Tetrathiomolybdate** is another **chelating agent** that works by forming complexes with copper in the bloodstream, preventing its uptake by tissues and enhancing excretion. - It is primarily used for **neurological Wilson's disease** due to its rapid effect on free copper and lower incidence of side effects compared to penicillamine, but it's not typically the first-line choice for general initial therapy, especially in the context of recurrent hepatitis. *Hepatic transplantation* - **Hepatic transplantation** is reserved for patients with Wilson's disease who develop **acute liver failure** or **end-stage liver disease** that does not respond to medical therapy. - It is a **definitive treatment** as it replaces the diseased liver with a healthy one capable of normal copper metabolism, but it is not the initial therapeutic approach for recurrent hepatitis when medical management is possible [1].

Q: Investigation of choice for a 74-year-old male patient with scanty bleeding per rectum and irregular bowel habits.

Colonoscopy. ***Colonoscopy*** - **Colonoscopy** is the investigation of choice for **lower gastrointestinal bleeding** and **changes in bowel habits** in older patients due to its ability to visualize the entire colon [1]. - It allows for direct visualization of mucosal abnormalities, **biopsy** acquisition for histological diagnosis, and **polypectomy** for therapeutic intervention [1]. *Sigmoidoscopy* - **Sigmoidoscopy** only visualizes the **rectum** and **distal sigmoid colon**, which could miss lesions higher up responsible for the symptoms [2]. - Given the patient's age and symptoms, more proximal colorectal pathology, such as **colon cancer**, must be excluded [1]. *Barium meal follow through* - A **barium meal follow through** is used to evaluate the **esophagus**, **stomach**, and **small intestine**, not the colon. - It is not suitable for investigating rectal bleeding or irregular bowel habits, which are typically colonic symptoms. *Barium enema* - A **barium enema** is an X-ray study that outlines the colon but is less sensitive than colonoscopy for detecting small lesions, polyps, or early cancers [1]. - It does not allow for **biopsy** or **polypectomy**, which are crucial for definitive diagnosis and treatment [1].

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

Surgery is not indicated. ***Surgery is not indicated*** - This statement is **false** because surgery *is* often indicated for blind loop syndrome, especially when anatomical abnormalities like strictures, fistulas, or diverticula are the cause and cannot be managed by other means [1]. - Surgical intervention aims to **correct the underlying anatomical defect** that promotes bacterial overgrowth, thereby reducing symptoms and complications [1]. *Syndrome of bacterial overgrowth* - Blind loop syndrome is primarily characterized by **small intestinal bacterial overgrowth (SIBO)**, where excessive bacteria colonize the small intestine [1]. - This overgrowth leads to the malabsorption of nutrients and other gastrointestinal symptoms due to the bacterial metabolism of bile salts and carbohydrates. *Steatorrhea, megaloblastic anemia & deficiency of fat soluble vitamins* - The bacterial overgrowth in blind loop syndrome consumes **vitamin B12**, leading to its deficiency and subsequently **megaloblastic anemia**. - Bacteria deconjugate **bile salts**, impairing fat digestion and absorption, which results in **steatorrhea** and deficiencies of **fat-soluble vitamins** (A, D, E, K). *14C-xylose or 14C-cholyglycine breath tests are indirect tests for bacterial overgrowth* - The **14C-xylose breath test** measures the bacterial metabolism of xylose, which is normally absorbed in the small intestine, indicating bacterial overgrowth if excreted as 14CO2. - The **14C-cholyglycine breath test** detects bacterial deconjugation of bile salts; an increase in expired 14CO2 suggests excessive bacterial activity in the small bowel.

Q: What is the most common cause of pyogenic liver abscess?

Biliary tract infection. ***Biliary tract infection*** - **Ascending cholangitis**, often due to obstruction from stones or strictures, allows bacteria to ascend into the liver, making it the most frequent cause of **pyogenic liver abscess** [1]. - Pathogens typically involved are **enteric gram-negative rods** (e.g., *E. coli, Klebsiella*) and **enterococci**, which commonly colonize the biliary tree. *Stricture of CBD* - While a **stricture of the Common Bile Duct (CBD)** can lead to biliary stasis and **cholangitis**, it is a *cause* within the broader category of biliary tract infections, rather than the most common *overall cause* of pyogenic liver abscess [1]. - The stricture itself creates an environment prone to infection, but the actual infection of the biliary tract is the direct preceding event. *Appendicitis* - **Appendicitis** can lead to liver abscesses via the **portal vein** (pylephlebitis) if bacteremia from the inflamed appendix spreads to the liver. - However, this is a less common pathway compared to direct extension from biliary infections. *Sigmoid Diverticulitis* - **Sigmoid diverticulitis** can also cause liver abscesses through **pylephlebitis**, where bacteria from the infected diverticula spread via the portal venous system. - Similar to appendicitis, this is a less frequent cause of pyogenic liver abscess compared to biliary tract disease.

Q: A patient presents with acute abdominal pain that is sharp and radiates to the back. Considering the patient's history of cholecystitis, what is the most likely diagnosis?

Acute pancreatitis. ***Acute pancreatitis*** - The combination of **severe acute abdominal pain** that radiates to the back, especially in a patient with a history of **cholecystitis** (gallstones being a common cause), is highly suggestive of acute pancreatitis [1]. - **Gallstone pancreatitis** occurs when a gallstone obstructs the pancreatic duct, leading to enzyme auto-digestion of the pancreas [2]. *Cholecystitis* - While the patient has a history of cholecystitis, the current symptom of pain radiating to the back is more characteristic of pancreatitis. - **Acute cholecystitis** typically presents with right upper quadrant pain, often radiating to the right shoulder or scapula, sometimes after a fatty meal [3]. *Appendicitis* - **Appendicitis** typically presents with periumbilical pain migrating to the right lower quadrant, and does not commonly radiate to the back. - It is not directly linked to a history of cholecystitis or gallstones as a causative factor. *Aortic aneurysm* - An **abdominal aortic aneurysm (AAA) rupture** can cause severe, sudden abdominal or back pain, but it is not typically associated with a history of cholecystitis as a predisposing factor for the acute presentation. - AAA pain is often described as tearing or ripping, and carries signs of hemodynamic instability.

Question 1

Blood group most commonly associated with gastric carcinoma is

Accepted Answer

Blood group A

Answer

Blood Group 0

Answer

Blood group AB

Answer

Blood group B

Question 2

Which of the following is the first-line treatment for Wilson's disease?

Accepted Answer

Penicillamine

Answer

Deferasirox

Answer

Zinc acetate

Answer

Trientine

Question 3

Autoimmune gastritis is associated with a deficiency of which vitamin?

Accepted Answer

Vitamin B12

Answer

Vitamin C

Answer

Vitamin D

Answer

Vitamin A

Question 4

Gold standard investigation for chronic pancreatitis?

Accepted Answer

Endoscopic Retrograde Cholangiopancreatography (ERCP)

Answer

Endoscopic Ultrasound (EUS)

Answer

MRI (Magnetic Resonance Imaging)

Answer

Pancreatic function tests

Question 5

What is the primary cause of dumping syndrome?

Accepted Answer

Rapid gastric emptying

Answer

Increased intestinal motility

Answer

Presence of hypertonic content in small intestine

Answer

Reduced gastric capacity

Question 6

A 14-year-old boy presents with recurrent episodes of hepatitis. Ophthalmoscopic evaluation reveals KF rings and serum ceruloplasmin levels are < 20 mg/dl. What is the treatment of choice for initial therapy?

Accepted Answer

Penicillamine

Answer

Zinc

Answer

Tetrathromolybdate

Answer

Hepatic transplantation

Question 7

Investigation of choice for a 74-year-old male patient with scanty bleeding per rectum and irregular bowel habits.

Accepted Answer

Colonoscopy

Answer

Sigmoidoscopy

Answer

Barium meal follow through

Answer

Barium enema

Question 8

Which of the following statements about blind loop syndrome is false?

Accepted Answer

Surgery is not indicated

Answer

Syndrome of bacterial overgrowth

Answer

14C-xylose or 14C-cholyglycine breath tests are indirect tests for bacterial overgrowth

Answer

Steatorrhea, megaloblastic anemia & deficiency of fat soluble vitamins

Question 9

What is the most common cause of pyogenic liver abscess?

Accepted Answer

Biliary tract infection

Answer

Stricture of CBD

Answer

Sigmoid Diverticulitis

Answer

Appendicitis

Question 10

A patient presents with acute abdominal pain that is sharp and radiates to the back. Considering the patient's history of cholecystitis, what is the most likely diagnosis?

Accepted Answer

Acute pancreatitis

Answer

Cholecystitis

Answer

Appendicitis

Answer

Aortic aneurysm

Gastroenterology — MCQs

Gastroenterology — MCQs

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