Quiz: Intra-Abdominal Infections — 24 questions

1. Which statement best characterizes the clinical significance of most intra-abdominal infections?

A. They are often medical-surgical emergencies with a potentially life-threatening prognosis.

B. They are primarily chronic disorders with little risk of acute deterioration.

C. They are generally benign conditions managed like localized noninfectious abdominal pain.

D. They usually remain self-limited without requiring urgent medical assessment.

Answer: (A)

Explanation

Most intra-abdominal infections are medical-surgical emergencies and may have a life-threatening prognosis. Treating them as benign localized abdominal pain would underestimate their potential severity.

2. Which imaging study is considered the reference examination for suspected intra-abdominal infection?

A. Plain abdominal radiography, followed by endoscopy when infection is suspected.

B. Ultrasonography, with computed tomography reserved for unrelated abdominal disorders.

C. Computed tomography, with ultrasonography used when complementary information is needed.

D. Magnetic resonance imaging, with ultrasonography replacing further evaluation.

Answer: (C)

Explanation

Computed tomography is the reference examination for intra-abdominal infection, while ultrasonography may provide complementary information. Ultrasonography is not generally the primary reference study in this setting.

3. Which group best represents the main microorganisms involved in intra-abdominal infections?

A. Enterococci and staphylococci, with anaerobes occurring mainly in community-acquired infections.

B. Enterobacteriaceae and anaerobes, with enterococci accounting for less than 10% and resistant organisms possible nosocomially.

C. Viruses and fungi, with Enterobacteriaceae appearing mainly after prolonged antibiotic exposure.

D. Streptococci and mycobacteria, with multidrug resistance uncommon in hospital-acquired infections.

Answer: (B)

Explanation

The principal organisms are Enterobacteriaceae and anaerobes; enterococci represent less than 10%, and nosocomial cases may include multidrug-resistant organisms. The other groups do not reflect the characteristic microbiology described.

4. What mechanism most commonly initiates acute appendicitis?

A. Intraluminal obstruction followed by mucosal inflammation and bacterial superinfection.

B. Immediate perforation of the appendix followed by secondary mucosal obstruction.

C. Primary hematogenous infection followed by ischemia of the surrounding peritoneum.

D. External compression of the appendix followed by sterile serosal inflammation.

Answer: (A)

Explanation

Acute appendicitis usually begins with obstruction of the appendiceal lumen, followed by mucosal inflammation and bacterial superinfection. Perforation is a possible complication rather than the usual initiating event.

5. In which age range does acute appendicitis occur most frequently?

A. Between 10 and 25 years of age.

B. Between 60 and 70 years of age.

C. Between 30 and 45 years of age.

D. After 75 years of age.

Answer: (A)

Explanation

Acute appendicitis occurs most often between 10 and 25 years of age. The 60–70-year range is more characteristic of the peak frequency of sigmoid diverticulitis.

6. Which presentation most strongly supports a diagnosis of acute appendicitis?

A. Epigastric pain with jaundice, marked pruritus, and clay-colored stools.

B. Diffuse abdominal pain with chest discomfort, bradycardia, and urinary retention.

C. Right iliac fossa pain with tenderness or guarding, fever, nausea, and vomiting.

D. Left iliac fossa pain with mild fever, diarrhea, and painless rectal examination.

Answer: (C)

Explanation

Typical appendicitis includes right iliac fossa pain with tenderness or guarding, fever around 38–38.5°C, nausea, vomiting, constipation, and a painful rectal examination. Left iliac fossa pain is more associated with sigmoid diverticulitis.

7. What is the usual management strategy for acute appendicitis?

A. Emergency surgery, sometimes laparoscopic, with antibiotics tailored to operative findings and complications.

B. Immediate drainage of the appendix, with antibiotics stopped regardless of operative findings.

C. Conservative observation with antibiotics for two weeks, followed by surgery if symptoms persist.

D. Elective surgery after several weeks, with a fixed antibiotic course for every patient.

Answer: (A)

Explanation

Management generally involves emergency surgery, which may be laparoscopic, while antibiotic duration ranges from 0 to 5 days according to findings and complications or reaches 7 days when surgery is not performed. A fixed antibiotic schedule or delayed operation does not reflect the described approach.

8. What is peritonitis?

A. Localized or generalized inflammation of the peritoneum lining the abdominopelvic cavity and covering its viscera.

B. Inflammation originating in the appendix and confined to the appendiceal wall.

C. Inflammation of the retroperitoneal tissues without involvement of the abdominal serous membrane.

D. Infection limited to the mucosa of the stomach and proximal small intestine.

Answer: (A)

Explanation

Peritonitis is inflammation of the peritoneum, which lines the abdominopelvic cavity and covers its viscera. Appendicitis instead originates in the appendix and is a distinct condition.

9. Which description correctly distinguishes secondary, primary, and iatrogenic peritonitis?

A. Secondary peritonitis follows laparoscopy, primary peritonitis is polymicrobial after perforation, and iatrogenic peritonitis is usually hematogenous.

B. Secondary peritonitis is hematogenous, primary peritonitis follows bowel perforation, and iatrogenic peritonitis develops without an identifiable trigger.

C. Secondary peritonitis affects the biliary tract, primary peritonitis affects the appendix, and iatrogenic peritonitis follows respiratory infection.

D. Secondary peritonitis arises from an intra-abdominal focus, primary peritonitis is usually monomicrobial and hematogenous, and iatrogenic peritonitis follows procedures.

Answer: (D)

Explanation

Secondary peritonitis comes from an intra-abdominal infectious focus such as perforation, whereas primary peritonitis is usually a rare monomicrobial hematogenous infection; iatrogenic cases follow procedures such as laparoscopy or peritoneal dialysis. The other descriptions interchange these mechanisms.

10. Which finding is particularly characteristic of established peritonitis?

A. A board-like abdominal rigidity accompanied by worsening pain, fever, nausea, or vomiting.

B. Intermittent painless abdominal cramps with increased stool frequency and no fever.

C. A soft, non-tender abdomen with increased bowel sounds after meals.

D. Isolated right upper quadrant tenderness with jaundice and pale stools.

Answer: (A)

Explanation

Peritonitis commonly produces initially localized then diffuse pain, board-like rigidity, fever, painful Douglas pouch examination, cessation of stool and gas, nausea, and vomiting. A soft painless abdomen with increased bowel activity is not the typical pattern.

11. Which intervention best reflects the emergency management of peritonitis?

A. Immediate corticosteroid therapy with no drainage, cultures, or treatment of the abdominal source.

B. Oral hydration and dietary restriction followed by delayed imaging after inflammatory symptoms resolve.

C. Observation with analgesics while waiting for spontaneous resolution of the peritoneal inflammation.

D. Peritoneal lavage and drainage with microbiological sampling, source control, supportive care, and empirical antibiotics later adapted to results.

Answer: (D)

Explanation

Peritonitis requires urgent medical-surgical treatment that includes lavage, drainage, microbiological sampling, treatment of digestive perforation, supportive care, and empirical antibiotics adjusted to microbiology. Delayed observation fails to control the infectious source or the systemic risks.

12. Which age pattern most strongly characterizes sigmoid diverticulitis?

A. It occurs most often between 60 and 70 years of age.

B. It occurs with similar frequency across all adult ages.

C. It occurs most often before 30 years of age.

D. It occurs most often between 10 and 25 years of age.

Answer: (A)

Explanation

Sigmoid diverticulitis is most common in adults aged 60–70 and is uncommon before age 30. The 10–25-year range is more characteristic of acute appendicitis, not sigmoid diverticulitis.

13. A patient with fever, constipation, localized guarding, and painful rectal examination has sigmoid diverticulitis. Where would the characteristic abdominal pain most likely be located?

A. The epigastric region

B. The right iliac fossa

C. The right hypochondrium

D. The left iliac fossa

Answer: (D)

Explanation

Typical sigmoid diverticulitis produces pain and localized tenderness in the left iliac fossa. Right iliac fossa pain is more characteristic of acute appendicitis.

14. A patient has uncomplicated sigmoid diverticulitis that is improving spontaneously, with no abscess or perforation. Which management is appropriate?

A. Immediate surgery with sigmoid resection

B. Routine surgery after the first clinical episode

C. Urgent drainage followed by prolonged antibiotics

D. Symptomatic treatment without antibiotics

Answer: (D)

Explanation

Uncomplicated disease with spontaneous improvement may be managed symptomatically without antibiotics. Surgery is reserved for complications such as abscess or perforation rather than used routinely in uncomplicated cases.

15. What is the most common mechanism underlying infection of the biliary tract?

A. Obstruction caused by parasites such as flukes

B. Obstruction caused by gallstones or tumors

C. Congenital narrowing of the pancreatic duct

D. Direct invasion caused by intestinal bacteria

Answer: (B)

Explanation

Biliary tract infections are mainly associated with obstruction from gallstones or tumors. Parasitic causes can occur, but they are less common than these obstructive causes.

16. Which condition is defined by infection of the gallbladder after prolonged obstruction of the cystic duct?

A. Acute cholecystitis

B. Pancreaticobiliary reflux

C. Primary biliary obstruction

D. Acute cholangitis

Answer: (A)

Explanation

Acute cholecystitis results from infection of the gallbladder after prolonged cystic duct obstruction, commonly by a stone. Acute cholangitis instead involves obstruction of the main bile duct.

17. Which clinical combination is most characteristic of acute cholecystitis?

A. Recurrent vomiting, suprapubic pain, and generalized guarding

B. High fever, intense right hypochondrial pain, and a positive Murphy sign

C. Jaundice, epigastric pain, and isolated abdominal distension

D. Mild fever, left iliac fossa pain, and painless rectal bleeding

Answer: (B)

Explanation

Acute cholecystitis typically causes high fever with chills, sudden severe right hypochondrial pain, and a positive Murphy sign. Jaundice with fever and right-sided or epigastric pain is more classically associated with acute cholangitis.

18. Which imaging test should generally be performed first when acute cholecystitis is suspected?

A. Plain abdominal radiography

B. Magnetic resonance imaging of the liver

C. Ultrasound of the biliary tract

D. Computed tomography of the pelvis

Answer: (C)

Explanation

Biliary ultrasound is the best initial imaging examination for suspected acute cholecystitis and can demonstrate wall thickening, gallstones, or cystic duct dilatation. Pelvic imaging does not directly provide the preferred first assessment of the gallbladder.

19. Which distinction correctly compares the two major types of hepatic abscess?

A. Pyogenic abscesses arise from parasites, whereas amoebic abscesses arise from biliary bacteria.

B. Pyogenic abscesses are usually sterile, whereas amoebic abscesses contain mixed enteric bacteria.

C. Pyogenic abscesses are linked to tropical travel, whereas amoebic abscesses are usually polymicrobial.

D. Pyogenic abscesses are usually polymicrobial, whereas amoebic abscesses are associated with tropical travel.

Answer: (D)

Explanation

Pyogenic hepatic abscesses are bacterial and often polymicrobial, frequently arising from biliary or colonic sources. Amoebic abscesses are particularly associated with prior travel to tropical regions.

20. Which symptom pattern is most typical of a hepatic abscess?

A. Sudden epigastric pain radiating to the groin and improved by shaking

B. Jaundice and painless right upper-quadrant swelling after meals

C. Fever and right hypochondrial pain radiating to the shoulder and worsened by shaking

D. Low-grade fever and left lower-quadrant pain relieved by movement

Answer: (C)

Explanation

Hepatic abscesses commonly cause fever and right hypochondrial pain that may radiate to the shoulder and worsen with shaking of the liver. Left lower-quadrant pain is more suggestive of sigmoid disease.

21. Which diagnostic approach best determines the number, size, and location of hepatic abscesses?

A. Endoscopy followed by routine biopsy of the gastric mucosa

B. Computed tomography or biliary ultrasound, with image-guided aspiration when needed

C. Plain radiography followed by blind surgical exploration in most patients

D. Serology alone without anatomical imaging or sampling

Answer: (B)

Explanation

Computed tomography or biliary ultrasound defines the abscess burden and location, while image-guided percutaneous aspiration can provide diagnostic material when necessary. Serology alone cannot adequately characterize the anatomical extent of the abscesses.

22. What treatment strategy is appropriate for a large hepatic abscess without an immediate indication for surgery?

A. A short course of analgesics followed by observation without antimicrobial therapy

B. Immediate open surgery for every large abscess regardless of complications

C. Antiparasitic therapy alone without drainage or microbiological assessment

D. Four to six weeks of adapted antibiotics with percutaneous radiological drainage

Answer: (D)

Explanation

Treatment combines empirical antibiotics adjusted to positive samples, usually for 4–6 weeks, with percutaneous radiological drainage for large abscesses. Surgery is generally reserved for complications such as perforation or peritonitis.

23. Which clinical pattern should raise suspicion of an intra-abdominal infection?

A. Abdominal pain with reduced appetite

B. Abdominal pain accompanied by fever

C. Abdominal pain accompanied by mild nausea

D. Abdominal pain occurring after a meal

Answer: (B)

Explanation

Fever accompanying abdominal pain increases the suspicion of an intra-abdominal infection. Pain without fever is less specifically suggestive, so the other symptoms do not establish the same level of concern.

24. What is the appropriate overall approach when an intra-abdominal infection is suspected?

A. Obtain appropriate imaging, then provide combined medical-surgical management

B. Perform immediate surgery, then consider medical treatment if needed

C. Begin dietary modification, then monitor symptoms without further evaluation

D. Use antibiotic therapy, then postpone imaging until symptoms persist

Answer: (A)

Explanation

Diagnosis should rely on appropriate imaging, followed by combined medical-surgical management when indicated. Antibiotics or surgery may contribute to treatment, but either one alone does not represent the stated diagnostic and therapeutic approach.