Surgical Infections Practice Questions

Q: Which of the following classifications is used for wound grading?

Southampton grading. ### Explanation **1. Why Southampton Grading is Correct:** The **Southampton Wound Assessment Scale** is a widely used clinical classification system specifically designed to grade the severity of **Surgical Site Infections (SSI)**. It categorizes wound healing based on clinical observation, ranging from normal healing to major destruction of deep tissues. * **Grade 0:** Normal healing. * **Grade I:** Normal healing with mild bruising or erythema. * **Grade II:** Erythema plus other signs of inflammation. * **Grade III:** Clear or serosanguinous discharge. * **Grade IV:** Purulent discharge (pus). * **Grade V:** Deep tissue breakdown (Dehiscence). **2. Why Other Options are Incorrect:** * **Rank and Wakefield Classification:** This is used in plastic and reconstructive surgery to classify **primary and secondary wound closure** (specifically regarding the timing and nature of skin grafts/flaps), not for grading infection severity. * **SEPSIS Grading:** While "Sepsis" refers to a systemic inflammatory response to infection, there is no specific "SEPSIS grading" for local surgical wounds. Clinical tools like **qSOFA** or **SIRS** criteria are used for systemic assessment, not wound grading. **3. Clinical Pearls for NEET-PG:** * **ASEPSIS Score:** Another high-yield scoring system for SSIs. It is more objective than Southampton as it assigns numerical points to parameters like serous discharge, erythema, purulence, and the use of antibiotics. * **CDC Classification of SSI:** Categorizes infections into **Superficial Incisional**, **Deep Incisional**, and **Organ/Space** infections. * **Crucial Timing:** Most surgical site infections manifest between **5 to 10 days** postoperatively. * **Most Common Organism:** *Staphylococcus aureus* remains the most common cause of SSI overall.

Q: What is the primary management for an epidural abscess?

Immediate surgical evacuation. **Explanation:** **Primary Management: Immediate Surgical Evacuation** An epidural abscess (particularly spinal) is a neurosurgical emergency. The primary goal of management is **immediate surgical decompression and evacuation** (typically via laminectomy) to prevent irreversible neurological damage. The spinal canal is a rigid, confined space; as the abscess expands, it causes mechanical compression and vascular compromise (ischemia) of the spinal cord. Delaying surgery once neurological deficits appear often leads to permanent paralysis. **Analysis of Incorrect Options:** * **B & C (Conservative management/Antibiotics alone):** While long-term antibiotics (6–8 weeks) are a crucial *adjunct* to surgery, they are rarely sufficient as primary treatment. Conservative management is only considered in highly selected cases where the patient is neurologically intact, the organism is known, and the abscess is small/liquid enough for CT-guided aspiration. * **D (Aggressive debridement):** While evacuation is necessary, "aggressive debridement" is a term more suited for necrotizing fasciitis or chronic osteomyelitis. In the epidural space, the focus is on decompression and drainage while preserving the integrity of the neural structures. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Fever, spinal pain, and progressive neurological deficit (seen in only 10-15% of cases). * **Gold Standard Investigation:** **MRI with Gadolinium contrast** is the investigation of choice. * **Most Common Organism:** *Staphylococcus aureus* (found in ~60% of cases). * **Risk Factors:** IV drug use, diabetes mellitus, and recent spinal procedures (e.g., epidural anesthesia). * **Prognostic Factor:** The single most important predictor of functional outcome is the patient’s neurological status *before* surgery.

Q: What is the best treatment for gas gangrene?

Debridement with IV penicillin. **Explanation:** Gas gangrene (Clostridial Myonecrosis) is a life-threatening emergency caused primarily by *Clostridium perfringens*. The management strategy focuses on immediate surgical intervention and targeted antimicrobial therapy. **Why Option C is Correct:** The gold standard treatment for gas gangrene is **emergency surgical debridement combined with high-dose IV Penicillin G**. 1. **Surgical Debridement:** This is the most critical step. Since *Clostridia* are obligate anaerobes, removing necrotic tissue and exposing the area to oxygen stops toxin production and bacterial proliferation. 2. **IV Penicillin:** Penicillin G remains the drug of choice for *Clostridium*. Often, **Clindamycin** is added to the regimen because it inhibits bacterial protein synthesis, thereby suppressing the production of lethal exotoxins (Alpha and Theta toxins). **Why Other Options are Incorrect:** * **Option A:** While debridement is essential, it is insufficient as a standalone treatment. Systemic antibiotics are mandatory to control the spread of infection. * **Option B:** Tetanus toxoid/antitoxin is part of general wound management but does not treat the active myonecrosis caused by *C. perfringens*. * **Option D:** Polyvalent antitoxins against gas gangrene were used historically but are **no longer recommended** due to lack of proven efficacy and high risk of hypersensitivity reactions. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** Very short (usually <24 hours). * **Clinical Sign:** "Dishwater pus" (thin, serosanguinous discharge) and **crepitus** (palpable gas in tissues). * **X-ray Finding:** Feathery pattern of gas in muscle planes. * **Hyperbaric Oxygen (HBO):** Often mentioned in exams; it is a useful **adjunct** but never a substitute for surgery. * **Most common organism:** *Clostridium perfringens* (Type A).

Q: Which of the following statements is not true regarding the diagnosis of gas gangrene?

Hyperbaric oxygen is the primary treatment modality.. **Explanation:** Gas gangrene (Clostridial Myonecrosis) is a life-threatening infection caused primarily by *Clostridium perfringens*. The diagnosis is clinical, characterized by rapid progression and profound systemic toxicity. **Why Option B is the correct answer (The False Statement):** While **Hyperbaric Oxygen (HBO)** therapy is a useful *adjunct* that inhibits toxin production and bacterial growth, it is **never the primary treatment**. The cornerstone of management is immediate and aggressive **surgical debridement** combined with high-dose antibiotics (Penicillin G and Clindamycin). Delaying surgery to arrange for HBO therapy significantly increases mortality. **Analysis of other options:** * **Option A (Pain):** Severe, excruciating pain that is **disproportionate** to the physical findings is the earliest and most reliable clinical sign of gas gangrene. * **Option C (Debridement):** Extensive surgical debridement (or amputation) is mandatory to remove all necrotic tissue and stop the spread of the anaerobic infection. * **Option D (Radiography):** X-rays or CT scans often show **gas in the soft tissues** (crepitus), which tracks along muscle planes. However, the absence of gas does not rule out the diagnosis. **Clinical Pearls for NEET-PG:** * **Incubation period:** Very short, usually < 24 hours. * **Classic finding:** "Dishwater" discharge with a sweet, mousy odor. * **Microscopy:** Gram-positive bacilli with a notable **absence of polymorphonuclear leucocytes** (due to alpha-toxin-mediated lysis). * **Most common organism:** *Clostridium perfringens* (Type A).

Q: Apart from Escherichia coli, what is the other most common organism implicated in acute suppurative bacterial peritonitis?

Klebsiella. **Explanation:** Acute suppurative bacterial peritonitis (Secondary Peritonitis) is typically a **polymicrobial infection** resulting from the perforation of a hollow viscus or inflammatory spread from intra-abdominal organs. **Why Klebsiella is correct:** In secondary peritonitis, the flora reflects the site of origin (usually the GI tract). While **Escherichia coli** is the most frequently isolated aerobic Gram-negative organism, **Klebsiella species** (specifically *K. pneumoniae*) rank as the second most common aerobic isolates. These organisms originate from the intestinal microbiota and proliferate rapidly in the peritoneal cavity following a breach in mucosal integrity. **Analysis of Incorrect Options:** * **A. Bacteroides:** While *Bacteroides fragilis* is the most common **anaerobe** isolated in peritonitis, it is generally found in combination with aerobes. In the context of "most common organisms" alongside E. coli, Klebsiella is statistically more frequent in aerobic cultures. * **C. Peptostreptococcus:** This is an anaerobic Gram-positive coccus. While present in polymicrobial intra-abdominal infections, it is less prevalent than E. coli or Klebsiella. * **D. Pseudomonas:** *Pseudomonas aeruginosa* is typically associated with tertiary peritonitis, immunocompromised states, or nosocomial (hospital-acquired) infections rather than primary or common secondary suppurative peritonitis. **High-Yield Clinical Pearls for NEET-PG:** * **Secondary Peritonitis:** Most common type; always polymicrobial (E. coli > Klebsiella > Streptococci > B. fragilis). * **Primary Peritonitis (SBP):** Usually monomicrobial; E. coli is the most common cause in adults with cirrhosis, while *Streptococcus pneumoniae* is common in children with nephrotic syndrome. * **Gold Standard Diagnosis:** Presence of free gas under the diaphragm on an erect X-ray (indicates perforation) and a peritoneal fluid WBC count >250 cells/mm³.

Question 1

Which of the following classifications is used for wound grading?

Accepted Answer

Southampton grading

Answer

Rank and Wakefield classification

Answer

SEPSIS grading

Answer

None of the above

Question 2

A 36-year-old male patient presents with swelling in the submandibular region, elevated tongue, dysphagia, and high fever. Intraoral examination reveals a grossly destructed lower first molar. What is the primary purpose of performing a culture and sensitivity test in this scenario?

Accepted Answer

To identify the antibiotic to which the causative organism is most sensitive or least resistant

Answer

To assess the overall severity of the infection

Answer

To determine if the current antibiotic dosage is sufficient

Answer

To guide the decision on when to discontinue antibiotic therapy

Question 3

A carbuncle is best treated by:

Accepted Answer

Incision and drainage

Answer

Antibiotics alone

Answer

Conservative management

Answer

Cruciate incision and deroofing

Question 4

After incision and drainage of an abscess, the infectious process has failed to regress despite the patient being on high doses of an antibiotic. What would be the most appropriate next step?

Accepted Answer

Repeat culture and sensitivity tests

Answer

Insert a large drain

Answer

Debride and irrigate the area with a fibrinolytic agent

Answer

Begin the parenteral administration of proteolytic enzymes to augment the antibiotics

Question 5

What is the primary management for an epidural abscess?

Accepted Answer

Immediate surgical evacuation

Answer

Conservative management

Answer

Antibiotics alone

Answer

Aggressive debridement

Question 6

What is the best treatment for gas gangrene?

Accepted Answer

Debridement with IV penicillin

Answer

Surgical debridement

Answer

Debridement with tetanus toxin

Answer

Debridement with polyvalent antitoxin

Question 7

What is the most common site of an intraperitoneal abscess?

Accepted Answer

Right inferior intraperitoneal space

Answer

Right superior intraperitoneal space

Answer

Left superior intraperitoneal space

Answer

Left inferior intraperitoneal space

Question 8

Which of the following complications is not seen with peritonitis?

Accepted Answer

Bone Marrow suppression

Answer

Renal Failure

Answer

Residual abscess

Answer

Endotoxic shock

Question 9

Which of the following statements is not true regarding the diagnosis of gas gangrene?

Accepted Answer

Hyperbaric oxygen is the primary treatment modality.

Answer

Pain disproportionate to the extent of necrotic tissue.

Answer

Extensive surgical debridement is required.

Answer

Gas is visible on radiographic imaging.

Question 10

Apart from Escherichia coli, what is the other most common organism implicated in acute suppurative bacterial peritonitis?

Accepted Answer

Klebsiella

Answer

Bacteroides

Answer

Peptostreptococcus

Answer

Pseudomonas

Surgical Infections — MCQs

Surgical Infections — MCQs

On this page

Practice by Chapter

Want unlimited practice?