Gastroenterology Practice Questions

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: 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: Which of the following is not a valid test for investigating fat malabsorption?

13C Triclosan. ***13C Triclosan*** - Triclosan is an **antimicrobial agent** and has no role in assessing fat digestion and absorption. - Its presence in the body does not reflect the function of the digestive system in processing fats. *13C Trioctanoin* - This is a **medium-chain triglyceride (MCT)** used in breath tests to assess the ability of the small intestine to absorb fats [2]. - Recovery of 13CO2 in the breath indicates efficient absorption of MCTs, which bypass the need for pancreatic lipase [2]. *13C Triolein* - Triolein is a **long-chain triglyceride (LCT)** used in breath tests to evaluate both pancreatic lipase activity (digestion) and intestinal absorption of fats [4]. - Reduced 13CO2 recovery suggests either **pancreatic insufficiency** or **small intestinal malabsorption** [3]. *13C Tripalmitin* - Tripalmitin is also an **LCT** and functions similarly to 13C Triolein in breath tests, requiring both pancreatic digestion and intestinal absorption [4]. - It helps differentiate between **pancreatic enzyme deficiency** and other causes of fat malabsorption [1].

Q: A patient comes with abdominal pain, jaundice, and portal hypertension. Anastomosis between which of the following veins is seen?

Esophageal veins and left gastric veins. ***Esophageal veins and left gastric veins*** - This anastomosis is crucial in **portal hypertension**, as increased pressure in the **portal venous system** (e.g., due to liver cirrhosis) causes blood to back up into the **systemic venous circulation** through these collateral vessels. - This shunting creates **esophageal varices**, which can rupture and lead to life-threatening **upper gastrointestinal bleeding**, commonly presenting with **jaundice** and **abdominal pain** in liver disease. *Left colic vein and middle colic veins* - Both the left colic and middle colic veins are tributaries of the **inferior mesenteric vein** and **superior mesenteric vein**, respectively, and are part of the **portal system**. - While they form an anastomosis (via the **marginal artery of Drummond**), this connection is within the portal system and does not typically serve as a portosystemic shunt to decompress portal hypertension in the way esophageal varices do. *Superior rectal and phrenic veins* - The **superior rectal vein** drains into the **inferior mesenteric vein** (part of the portal system), and the **phrenic veins** drain into the **inferior vena cava** (part of the systemic system). - There is no direct significant portosystemic anastomosis between these two veins that would be clinically relevant in portal hypertension. *Sigmoid and superior rectal veins* - Both the **sigmoid veins** and the **superior rectal vein** are part of the **inferior mesenteric venous system**, which drains into the **portal circulation**. - While there are anastomoses between these veins within the mesenteric circulation, they are not a direct portosystemic shunt used to relieve pressure in portal hypertension causing the described symptoms.

Q: A 30-year-old male is found to be positive for HBsAg and HBeAg and is diagnosed with chronic hepatitis B. The patient's viral load is 2 × 10^5 IU/mL and ALT is elevated (2× upper limit of normal). What is the appropriate management in this patient?

Tenofovir. Tenofovir - This patient presents with chronic hepatitis B (HBsAg positive for >6 months), evidence of active viral replication (HBeAg positive, high viral load), and liver inflammation (elevated ALT). [3] This signifies chronic active hepatitis B, requiring treatment. [1] - Tenofovir is a highly potent nucleotide analog with a high barrier to resistance, making it a first-line treatment for chronic hepatitis B. *Lamivudine* - While an antiviral for HBV, lamivudine has a low genetic barrier to resistance, meaning resistance mutations can rapidly develop, reducing its long-term efficacy. - Due to the high risk of resistance, lamivudine is generally not recommended as a first-line monotherapy for treatment-naive patients with chronic hepatitis B, especially with a high viral load. *Pegylated interferon* - Pegylated interferon is an option for chronic hepatitis B, but it causes significant side effects (e.g., fatigue, depression, bone marrow suppression) and is usually administered by injection. [2] - Its efficacy in achieving sustained HBeAg seroconversion or HBsAg loss can be variable, and it is often reserved for patients who prefer a finite course of treatment and can tolerate the side effects, or for those without advanced liver disease. [2] *Combined pegylated interferon with lamivudine* - There is no significant evidence that combining pegylated interferon with lamivudine offers superior efficacy compared to monotherapy with a potent nucleos(t)ide analog like tenofovir or entecavir. - This combination would increase the side effect burden from interferon and still carry the risk of lamivudine resistance without substantial added benefit.

Q: A patient with a history of alcohol dependence syndrome presents with sudden and unintentional weight loss. Laboratory results show an alpha-fetoprotein (AFP) level of 600 ng/mL, AST 180 U/L, ALT 90 U/L, and normal bilirubin levels. Imaging reveals underlying cirrhosis and a hepatic mass demonstrating arterial phase hyperenhancement and washout appearance in the portal venous phase on multiphasic CT. What is the most likely diagnosis?

Hepatocellular carcinoma. ***Hepatocellular carcinoma*** - The **alpha-fetoprotein (AFP)** level of **600 ng/mL** is significantly elevated, raising concern for hepatocellular carcinoma, especially in a patient with a history of **alcohol dependence syndrome** and underlying **cirrhosis** [1]. - Diagnosis is supported by multiphasic CT imaging demonstrating a **hepatic mass with arterial phase hyperenhancement and washout appearance in the portal venous phase**, which are characteristic features of hepatocellular carcinoma. *Alcoholic hepatitis* - Typically presents with **elevated AST and ALT**, usually with a ratio >2:1. In this case, the AST/ALT ratio is exactly 2:1 (180/90), which is at the threshold but does not exclude other diagnoses [2]. - May cause weight loss, as alcoholic patients often lose weight due to self-neglect and poor dietary intake, but the **elevated AFP** and characteristic imaging findings are not consistent with merely alcoholic hepatitis [3]. *Cholangiocarcinoma* - This type of cancer primarily presents with **biliary obstruction** symptoms, such as jaundice, which is not indicated here given **normal bilirubin levels**. - Does not typically lead to such high levels of **AFP**, making it less likely with the provided lab results. *Hepatic adenoma* - More commonly associated with **oral contraceptive use** or anabolic steroid use, not primarily alcohol dependence. - AFP levels are usually normal or only mildly elevated in hepatic adenoma, making this option less viable with an **AFP level of 600 ng/mL**.

Q: Which of the following scores uses bilirubin, albumin, INR, ascites, and encephalopathy to classify cirrhosis into classes A, B, and C?

Child-Pugh score. ***Child-Pugh score*** - The **Child-Pugh score** is a widely used scoring system to assess the **prognosis of liver disease**, particularly in patients with cirrhosis. - It considers parameters like **bilirubin, albumin, prothrombin time/INR, ascites, and encephalopathy** to classify severity into classes A, B, and C. *Milan criteria* - The Milan criteria are specifically used to determine transplantation eligibility for patients with **hepatocellular carcinoma (HCC)**. - They define tumor size and number limits for which **liver transplantation** offers a good prognosis. *MELD score* - The **Model for End-Stage Liver Disease (MELD) score** is primarily used to predict **three-month mortality** in patients with liver disease and to prioritize patients for liver transplant waiting lists. - It incorporates **bilirubin, creatinine, and INR** to calculate a score reflecting disease severity. *Alvarado score* - The **Alvarado score** is a diagnostic aid used to assess the likelihood of **acute appendicitis**. - It includes clinical findings like right lower quadrant tenderness, fever, and laboratory values like leukocytosis.

Q: Which of the following laboratory values is NOT a component of the MELD score?

Albumin. ***Albumin*** - **Albumin** is a component of the Child-Pugh score, which is also used to assess liver function, but it is **not included in the MELD score**. [2] - The MELD score specifically focuses on **renal function** (creatinine) and **liver synthesis/excretory function** (bilirubin and INR). [1] *Serum bilirubin* - **Serum bilirubin** is a key indicator of the liver's ability to excrete bile and is a **direct component** of the MELD score. [1], [2] - Higher bilirubin levels generally indicate **worse hepatocellular function** and are associated with a higher MELD score. *Serum creatinine* - **Serum creatinine** is a measure of **renal function** and is an important component of the MELD score. [1] - It reflects the severity of **hepatorenal syndrome** and the overall prognosis in patients with liver disease. [1] *International normalized ratio (INR)* - The **International Normalized Ratio (INR)** assesses the liver's synthetic function, specifically its ability to produce **clotting factors**. [2] - A higher INR indicates **impaired coagulation** due to liver dysfunction and is a direct component of the MELD score. [1]

Question 1

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 2

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 3

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 4

Which vitamin is not deficient in celiac disease?

Accepted Answer

Vitamin D

Answer

Vitamin B12

Answer

Vitamin A

Answer

Folic acid

Question 5

Which of the following is not a valid test for investigating fat malabsorption?

Accepted Answer

13C Triclosan

Answer

13C Trioctanoin

Answer

13C Triolein

Answer

13C Tripalmitin

Question 6

A patient comes with abdominal pain, jaundice, and portal hypertension. Anastomosis    between which of the following veins is seen?

Accepted Answer

Esophageal veins and left gastric veins

Answer

Left colic vein and middle colic veins

Answer

Superior rectal and phrenic veins

Answer

Sigmoid and superior rectal veins

Question 7

A 30-year-old male is found to be positive for HBsAg and HBeAg and is diagnosed with chronic hepatitis B. The patient's viral load is 2 × 10^5 IU/mL and ALT is elevated (2× upper limit of normal). What is the appropriate management in this patient?

Accepted Answer

Tenofovir

Answer

Combined pegylated interferon with lamivudine

Answer

Pegylated interferon

Answer

Lamivudine

Question 8

A patient with a history of alcohol dependence syndrome presents with sudden and unintentional weight loss. Laboratory results show an alpha-fetoprotein (AFP) level of 600 ng/mL, AST 180 U/L, ALT 90 U/L, and normal bilirubin levels. Imaging reveals underlying cirrhosis and a hepatic mass demonstrating arterial phase hyperenhancement and washout appearance in the portal venous phase on multiphasic CT. What is the most likely diagnosis?

Accepted Answer

Hepatocellular carcinoma

Answer

Cholangiocarcinoma

Answer

Alcoholic hepatitis

Answer

Hepatic adenoma

Question 9

Which of the following scores uses bilirubin, albumin, INR, ascites, and encephalopathy to classify cirrhosis into classes A, B, and C?

Accepted Answer

Child-Pugh score

Answer

Milan criteria

Answer

MELD score

Answer

Alvarado score

Question 10

Which of the following laboratory values is NOT a component of the MELD score?

Accepted Answer

Albumin

Answer

Serum creatinine

Answer

Serum bilirubin

Answer

International normalized ratio (INR)

Gastroenterology — MCQs

Gastroenterology — MCQs

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