Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 1171: Which of the following is the most common screening test for acute pancreatitis?

A. Serum lipase (Correct Answer)
B. Urine trypsinogen
C. Insulin
D. Serum amylase

Explanation: ***Serum lipase*** - **Serum lipase** is considered the most specific and sensitive enzyme for diagnosing acute pancreatitis. [1] - Its levels typically rise within 4-8 hours of acute pancreatitis onset and can remain elevated for 8-14 days. [1] *Serum amylase* - While **serum amylase** is also elevated in acute pancreatitis, it is less specific than lipase as it can be elevated in other conditions (e.g., salivary gland disease, bowel ischemia). [1] - Its levels usually normalize more quickly than lipase, making it less useful for diagnosing pancreatitis with delayed presentation. [1] *Urine trypsinogen* - **Urine trypsinogen** can be elevated in pancreatitis, but it is not a routinely used or widely available screening test. [1] - Its diagnostic accuracy and clinical utility are not as well-established or practical as serum lipase or amylase. [1] *Insulin* - **Insulin** is a hormone produced by the pancreas involved in glucose regulation and is not a marker for pancreatic inflammation or injury in acute pancreatitis. - Its levels would not be used to diagnose acute pancreatitis.

Question 1172: Which of the following is the most sensitive and specific test for acute pancreatitis?

A. S.amylase
B. S.Alanine transaminase
C. S.lipase (Correct Answer)
D. C-reactive protein

Explanation: ***S.lipase*** - **Serum lipase** is considered the most sensitive and specific marker for **acute pancreatitis** because it remains elevated longer than amylase and is less commonly elevated in non-pancreatic conditions. - A level of **serum lipase** that is three times the upper limit of normal is highly indicative of **acute pancreatitis**. *S.amylase* - **Serum amylase** is often elevated in **acute pancreatitis**, but it is less specific than lipase, as it can also be elevated in other conditions like **salivary gland disease**, **bowel ischemia**, or **renal failure** [1]. - **Amylase** levels typically normalize within 3-5 days, whereas lipase levels can remain elevated for 8-14 days. *S.Alanine transaminase* - **Serum alanine transaminase (ALT)** is primarily a marker of **hepatocellular injury** and is not directly used for diagnosing **acute pancreatitis**. - While elevated **ALT** can sometimes suggest **gallstone pancreatitis** if significantly high (e.g., >150 U/L), it's not a diagnostic test for the pancreatitis itself. *C-reactive protein* - **C-reactive protein (CRP)** is an **acute-phase reactant** that indicates inflammation and tissue damage, and its levels rise in pancreatitis. - However, **CRP** is a non-specific marker of inflammation and is more useful for assessing the **severity** and **prognosis** of pancreatitis rather than for initial diagnosis [1].

Question 1173: Which enzyme is most specific for pancreatic pathology in the evaluation of chronic pancreatitis?

A. Amylase
B. Lipase (Correct Answer)
C. Elastase
D. Trypsin

Explanation: Lipase - **Lipase** is highly specific to the pancreas and is useful for diagnosing chronic pancreatitis, especially when evaluating for **pancreatic insufficiency**. - Its levels can remain elevated longer than amylase in acute pancreatitis, and it is less prone to elevation from non-pancreatic sources. *Amylase* - While elevated in pancreatic pathology, **amylase** can also be increased due to non-pancreatic conditions such as salivary gland issues, kidney failure, or certain cancers. - Its specificity for the pancreas is lower compared to lipase, and it may not be persistently elevated in chronic pancreatitis due to widespread destruction of acinar cells. *Elastase* - **Fecal elastase-1** is a sensitive and specific test for **exocrine pancreatic insufficiency**, a common feature of chronic pancreatitis [1]. - However, it measures pancreatic function by assessing the enzyme's presence in stool rather than being a direct marker of acute pancreatic injury in serum. *Trypsin* - **Trypsin** and **immunoreactive trypsinogen** are markers of pancreatic function, and elevated levels can suggest pancreatic damage. - However, like amylase, serum trypsin levels can also be affected by renal impairment and are not as widely used as lipase for routine diagnosis of chronic pancreatitis.

Question 1174: Which of the following is MOST characteristic of gastric ulcers compared to duodenal ulcers?

A. Pain is more common during the day than at night.
B. Pain is relieved with ingestion of food
C. Hematemesis is more common than melena in gastric ulcers (Correct Answer)
D. Usually occurs in older adults.

Explanation: No relevant references with a score >= 7 were provided to support the clinical characteristics of gastric versus duodenal ulcers in the explanation. Hematemesis is more common than melena in gastric ulcers; gastric ulcers are located in the stomach, so if they bleed, the blood is more likely to be vomited before it has been digested enough to turn black (melena). The closer the bleeding source is to the mouth in the GI tract, the more likely freshly passed blood will be bright red (hematemesis). Pain is more common during the day than at night. While gastric ulcer pain can occur at any time, it is not specifically more common during the day compared to at night as a characteristic differentiator from duodenal ulcers. Duodenal ulcer pain is often described as nocturnal or occurring several hours after a meal, but this option does not isolate a unique feature of gastric ulcers. Usually occurs in older adults. While the incidence of peptic ulcer disease can increase with age, stating that gastric ulcers usually occur in older adults is not a characteristic distinguishing them from duodenal ulcers, as both can affect various age groups, and duodenal ulcers are often seen in younger to middle-aged adults. This statement is too general and does not provide a specific differentiating feature. Pain is relieved with ingestion of food. This description is more characteristic of duodenal ulcers, where food can transiently buffer stomach acid, alleviating the pain. In contrast, gastric ulcer pain is often worsened by food intake, as eating stimulates acid secretion and gastric motility.

Question 1175: All of the following drugs may be used in the treatment of ulcerative colitis except:

A. Corticosteroids
B. Sulfasalazine
C. Methotrexate (Correct Answer)
D. Azathioprine

Explanation: ***Methotrexate*** - While methotrexate is an immunosuppressant used in some autoimmune conditions, it is **not a first-line or commonly used drug for ulcerative colitis**. [2] - Its role in inflammatory bowel disease is primarily established for **Crohn's disease**, not ulcerative colitis. *Corticosteroids* - **Corticosteroids** are commonly used for inducing remission in **moderate to severe ulcerative colitis** due to their potent anti-inflammatory effects. [1] - They are effective for short-term management of flares but are not suitable for long-term maintenance therapy due to significant side effects. *Sulfasalazine* - **Sulfasalazine** is an aminosalicylate (5-ASA) drug, frequently used for the **induction and maintenance of remission in mild to moderate ulcerative colitis**. [1] - It works by reducing inflammation in the colon. *Azathioprine* - **Azathioprine** is an immunosuppressant often used for **maintaining remission in moderate to severe ulcerative colitis** when corticosteroids cannot be tapered or are ineffective. - It helps reduce the need for long-term corticosteroid use and can prevent disease flares.

Question 1176: What disease is associated with ascitic fluid SAAG < 1.1?

A. Peritoneal carcinomatosis (Correct Answer)
B. Liver failure
C. Portal vein thrombosis
D. Tuberculosis peritonitis

Explanation: Peritoneal carcinomatosis - A serum-ascites albumin gradient (SAAG) less than 1.1 g/dL indicates that the ascites is not due to portal hypertension [1]. - In peritoneal carcinomatosis, the malignant cells in the peritoneum disrupt the normal fluid exchange, leading to fluid accumulation that is low in albumin relative to serum [1]. Liver failure - Liver failure, especially when leading to cirrhosis, is typically associated with portal hypertension and a SAAG ≥ 1.1 g/dL [1]. - The high SAAG reflects the increased hydrostatic pressure in the hepatic sinusoids, forcing fluid low in protein into the peritoneal cavity [1]. Portal vein thrombosis - Portal vein thrombosis causes portal hypertension and would therefore be associated with a high SAAG (≥ 1.1 g/dL) [1]. - The obstruction of the portal vein leads to increased sinusoidal hydrostatic pressure, similar to other causes of portal hypertension [1]. Tuberculosis peritonitis - Tuberculosis peritonitis is an inflammatory condition that can cause ascites, but it is typically associated with a SAAG < 1.1 g/dL [1]. - This is because the inflammatory process in the peritoneum allows for the leakage of albumin into the ascitic fluid, diminishing the gradient [1].

Question 1177: Portal hypertension is said to be present if portal venous pressure is more than:

A. 10 mm Hg (Correct Answer)
B. 3-5 mm Hg
C. 5-10 mm Hg
D. 12-15 mm Hg

Explanation: ***10 mm Hg*** - Portal hypertension is defined by a **hepatic venous pressure gradient (HVPG)** greater than 5 mmHg, but significant clinical consequences usually arise when the **portal venous pressure** exceeds **10 mmHg** [1]. - A persistent elevation above this threshold leads to the development of complications such as **ascites**, **varices**, and **splenomegaly** [1]. *3-5 mm Hg* - A portosystemic gradient of 3-5 mmHg is considered **normal portal pressure**, indicating no significant obstruction or resistance to portal flow [1]. - Pressures within this range do not cause the clinical manifestations associated with portal hypertension. *5-10 mm Hg* - While a **hepatic venous pressure gradient (HVPG)** greater than 5 mmHg technically defines portal hypertension, clinical symptoms typically do not appear until the pressure exceeds 10 mmHg [1]. - This range represents **mild portal hypertension** which may not be clinically significant. *12-15 mm Hg* - Pressures in the range of 12-15 mmHg indicate **severe portal hypertension**, which is often associated with a high risk of complications such as **esophageal variceal bleeding**. - This is a critical threshold for developing serious clinical sequelae, not the lower limit for defining portal hypertension.

Question 1178: Blood group most commonly associated with gastric carcinoma is

A. Blood Group 0
B. Blood group A (Correct Answer)
C. Blood group AB
D. Blood group B

Explanation: ***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.

Question 1179: Phlegmonous gastritis occurs due to?

A. H. pylori
B. Staphylococcus aureus
C. Streptococcus species (Correct Answer)
D. Clostridium perfringens

Explanation: **Streptococcus species** - **Phlegmonous gastritis** is a **rare, severe bacterial infection** of the stomach wall often caused by **Streptococcus species**. - These bacteria invade the gastric submucosa, leading to **purulent inflammation** and potential perforation. *H. pylori* - **H. pylori** is a common cause of **chronic gastritis**, peptic ulcers, and is associated with gastric cancer and MALT lymphoma [1]. - It typically causes **superficial inflammation** rather than invasive, purulent infection of the stomach wall [1]. *Staphylococcus aureus* - **Staphylococcus aureus** is a common cause of **food poisoning** due to its secreted toxins, which cause rapid onset of nausea, vomiting, and diarrhea [3]. - While it can cause other severe infections, it is **not a primary pathogen** for phlegmonous gastritis. *Clostridium perfringens* - **Clostridium perfringens** is known for causing **gas gangrene** and certain types of **food poisoning** (especially anaerobic cellulitis and myonecrosis) [2]. - It is **not typically implicated** in the severe, purulent inflammation of phlegmonous gastritis.

Question 1180: Gold standard investigation for chronic pancreatitis?

A. Endoscopic Ultrasound (EUS)
B. MRI (Magnetic Resonance Imaging)
C. Endoscopic Retrograde Cholangiopancreatography (ERCP) (Correct Answer)
D. Pancreatic function tests

Explanation: ***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].

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Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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