Gastroenterology Practice Questions

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 patient with a history of alcohol dependence syndrome presents with sudden and unintentional weight loss. What is the most likely diagnosis?

Hepatocellular carcinoma. ***Hepatocellular carcinoma*** - The **alpha-fetoprotein (AFP)** level of **600 ng/mL** is significantly elevated, suggesting a diagnosis of hepatocellular carcinoma, especially in a patient with a history of **alcohol dependence syndrome** [1]. - The **AST/ALT ratio of 0.5** indicates significant liver damage, commonly seen in chronic liver disease leading to **hepatocellular cancer**. *Alcoholic hepatitis* - Typically presents with **elevated AST and ALT**, usually with a ratio >2:1, which is not the case here [2]. - May cause weight loss, as alcoholic patients often lose weight due to self-neglect and poor dietary intake, but the **elevated AFP** is not characteristic of 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: 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: Which virus is typically associated with serpiginous ulcers in the distal esophagus?

CMV. CMV - Serpiginous ulcers in the distal esophagus are indicative of **cytomegalovirus (CMV) esophagitis**, especially in immunocompromised patients. - CMV infection can lead to **ulcerative lesions** that have a characteristic serpentine appearance, differentiating it from other causes. *Pill* - Pill-induced esophagitis generally results in **localized ulcers** rather than serpiginous ones and is often associated with the use of certain medications. - Symptoms typically include **dysphagia** and **odynophagia**, without the characteristic serpentine ulcer morphology. *Corrosive* - Corrosive injuries from chemicals present as **burn-like lesions** and strictures rather than serpiginous ulcers; the morphology is quite distinct. - These injuries usually occur due to ingestion of strong acids or alkalis, leading to **necrosis**, and don't show typical serpiginous ulceration. *Herpes* - Herpes simplex virus usually causes **multiple shallow ulcers** rather than deep, serpiginous ulcers, and is more commonly observed in the form of **vesicular lesions**. - Typically it presents with fever and significant **pain**, which is not the primary characteristic of CMV esophagitis.

Q: A 42-year-old patient with obstructive jaundice. Alp, Ggt, haptoglobin all increased. The most likely cause is:

Biliary obstruction. ***Alcohol*** - Chronic **alcohol consumption** leads to hepatic injury, causing cholestasis and increased levels of **Alkaline Phosphatase (ALP)** and **Gamma-glutamyl transferase (GGT)** [1, 2]. - Increased **haptoglobin** indicates hemolysis or hepatic dysfunction, commonly seen in alcohol-related liver disease [1]. *Lead* - Lead poisoning typically causes **anemia** and affects **erythropoiesis**, but does not generally increase ALP and GGT levels significantly. - The classic presentation involves **neurological** deficits and **peripheral neuropathy**, rather than obstructive jaundice. *Chronic rf* - Chronic renal failure primarily affects **uremia** and renal function tests, with minimal impact on liver function tests like ALP and GGT. - It is not directly associated with **increased haptoglobin**, which is usually elevated in liver disease. *None of the above* - This option implies that none of the listed causes could lead to the observed lab changes, which is incorrect as **alcohol** is a known cause [1, 2]. - Enhancing liver damage from substances other than alcohol is not applicable based on the information given.

Q: Which of the following criteria is used to assess the prognosis of liver disease?

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: Esophageal manometry was performed - it revealed panesophageal pressurization with distal contractile integrity as >450mm Hg pressure in the body. What will be the diagnosis?

Type 3 achalasia. The diagnosis is Type 3 achalasia. This condition is characterized by panesophageal pressurization, indicating diffuse, simultaneous contractions throughout the esophagus. The high distal contractile integrity (>450 mmHg pressure) further supports Type 3 achalasia, which involves significant spastic contractions. In contrast, while high-resolution manometry allows for the accurate classification of these motility abnormalities [1], other types present differently. Type 1 achalasia (classic achalasia) is marked by failed esophageal peristalsis and absent or minimal esophageal pressurization [1]. The primary characteristic is incomplete or absent lower esophageal sphincter (LES) relaxation, not hypercontractility [1]. Type 2 achalasia is identified by esophageal panesophageal pressurization (simultaneous contractions), but with normal to high contractile pressures, not the extremely high values seen here. Jackhammer esophagus involves hypercontractility (distal contractile integral >8000 mmHg·cm·s) and is characterized by rapid, repetitive, and fragmented contractions, rather than the diffuse panesophageal pressurization and spasticity typical of Type 3 achalasia [2].

Question 1

Which vitamin is not deficient in celiac disease?

Accepted Answer

Vitamin D

Answer

Vitamin B12

Answer

Vitamin A

Answer

Folic acid

Question 2

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 3

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 4

A patient with a history of alcohol dependence syndrome presents with sudden and unintentional weight loss. What is the most likely diagnosis?

Accepted Answer

Hepatocellular carcinoma

Answer

Hepatic adenoma

Answer

Cholangiocarcinoma

Answer

Alcoholic hepatitis

Question 5

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 6

The differentiating feature between IBS and organic GI disease is:

Accepted Answer

Presence of inflammation indicated by elevated stool calprotectin

Answer

Pain abdomen

Answer

Mucus in stools

Answer

Diarrhea

Question 7

Which virus is typically associated with serpiginous ulcers in the distal esophagus?

Accepted Answer

CMV

Answer

Herpes

Answer

Pill

Answer

Corrosive

Question 8

A 42-year-old patient with obstructive jaundice. Alp, Ggt, haptoglobin all increased. The most likely cause is:

Accepted Answer

Biliary obstruction

Answer

Alcohol

Answer

Lead

Answer

None of the options

Question 9

Which of the following criteria is used to assess the prognosis of liver disease?

Accepted Answer

Child-Pugh score

Answer

Milan criteria

Answer

MELD score

Answer

Alvarado score

Question 10

Esophageal manometry was performed - it revealed panesophageal pressurization with distal contractile integrity as >450mm Hg pressure in the body. What will be the diagnosis?

Accepted Answer

Type 3 achalasia

Answer

Type 2 achalasia

Answer

Jackhammer esophagus

Answer

Type 1 achalasia (classic achalasia)

Gastroenterology — MCQs

Gastroenterology — MCQs

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