Internal Medicine Gastroenterology Disorders Questions and Answers

Question 1

A 32-year-old male is newly diagnosed with moderate-to-severe ileocolonic Crohn's disease. He has not received prior treatment. According to the most recent American Gastroenterological Association (AGA) guidelines, which of the following is the most appropriate initial therapeutic approach?

Accepted Answer

Early initiation of an anti-TNF agent such as infliximab

Answer

Current AGA guidelines recommend early initiation of advanced therapies, such as anti-TNF agents (e.g., infliximab), for patients with moderate-to-severe Crohn's disease. This approach is favored over traditional 'step-up' therapy to achieve better long-term outcomes, including mucosal healing and reduced complications. Corticosteroids are used for induction but not for maintenance, oral mesalamine is generally ineffective for moderate-to-severe Crohn's, and antibiotics are reserved for specific complications like abscesses or fistulae.

Question 2

A 28-year-old woman presents with chronic diarrhea, bloating, and newly diagnosed iron deficiency anemia. Celiac disease is suspected. Which of the following is the most appropriate initial serologic test for this condition in an adult who is not IgA deficient?

Accepted Answer

Tissue transglutaminase (tTG)-IgA antibody

Answer

The tissue transglutaminase (tTG)-IgA antibody test is the preferred single test for detecting celiac disease in adults and children over the age of two, due to its high sensitivity and specificity. Anti-endomysial (EMA) antibodies are highly specific but less sensitive and more operator-dependent. Anti-gliadin antibodies are no longer recommended for primary screening. Genetic testing is useful to rule out celiac disease but does not confirm a diagnosis.

Question 3

A 50-year-old man with a history of heavy alcohol use is admitted with severe epigastric pain radiating to the back and a serum lipase level five times the upper limit of normal. He is diagnosed with acute pancreatitis. Which of the following interventions is considered the cornerstone of early management?

Accepted Answer

Aggressive intravenous fluid resuscitation

Answer

Aggressive early intravenous fluid resuscitation is the single most critical intervention and cornerstone of management in acute pancreatitis. It is crucial for maintaining pancreatic and systemic perfusion, thereby reducing the risk of complications like pancreatic necrosis and organ failure. Prophylactic antibiotics are not recommended for severe acute pancreatitis without evidence of infection. ERCP is indicated emergently only if there is concurrent cholangitis. Nasogastric tube placement is not routinely required unless there is intractable vomiting or severe ileus.

Question 4

A 62-year-old man with cirrhosis and ascites presents with a fever of 38.5°C (101.3°F) and diffuse abdominal pain. A diagnostic paracentesis is performed. Which of the following ascitic fluid findings is diagnostic for spontaneous bacterial peritonitis (SBP)?

Accepted Answer

Polymorphonuclear (PMN) leukocyte count of 350 cells/mm³

Answer

The diagnosis of spontaneous bacterial peritonitis (SBP) is established by an ascitic fluid polymorphonuclear (PMN) leukocyte count of ≥250 cells/mm³. Therefore, a count of 350 cells/mm³ is diagnostic and requires immediate initiation of empiric antibiotic therapy. A SAAG > 1.1 g/dL indicates portal hypertension but not infection. A positive culture with a low PMN count is termed bacterascites and may not require treatment if the patient is asymptomatic. Ascitic fluid protein levels are not used for diagnosing SBP.

Question 5

A 48-year-old patient requires treatment for a newly diagnosed *Helicobacter pylori* infection. The local clarithromycin resistance rate is known to be over 20%. According to the latest ACG guidelines, which of the following is a recommended first-line therapy?

Accepted Answer

Bismuth quadruple therapy for 14 days

Answer

In regions where clarithromycin resistance is high (>15%), standard clarithromycin-based triple therapy is no longer recommended as a first-line treatment due to low eradication rates. The updated 2024 ACG guidelines strongly recommend bismuth quadruple therapy (a PPI, bismuth, tetracycline, and a nitroimidazole) for 14 days as a preferred first-line option. Levofloxacin-based regimens are typically reserved for salvage therapy, and dual therapy has inferior efficacy.

Internal Medicine Exam Practice Test

Internal Medicine Exam Practice Test

Internal Medicine Gastroenterology Disorders Questions and Answers