Surgical Infections Practice Questions

Q: Antibioma is best treated by?

Complete resection. **Explanation:** An **Antibioma** is a tough, fibrous mass that forms when an acute abscess is treated with antibiotics without prior surgical drainage. The antibiotics sterilize the pus or suppress the infection, but the body reacts by walling off the area with dense fibrous tissue, resulting in a painless or mildly tender, firm, non-fluctuant swelling. **Why Complete Resection is the Correct Answer:** Once an antibioma has formed, the thick, avascular fibrous capsule prevents further antibiotic penetration. Since the contents are often organized or semi-solid rather than liquid pus, simple drainage is usually ineffective. **Complete surgical excision (resection)** of the entire mass along with its capsule is the definitive treatment to ensure resolution and prevent recurrence. **Analysis of Incorrect Options:** * **Partial Resection:** This is avoided as it leaves behind infected or necrotic tissue and the fibrous capsule, which can lead to chronic sinus formation or recurrence. * **Aspiration:** Antibiomas are solid or semi-solid masses with thick walls. Aspiration typically fails because the contents are too thick to pass through a needle and the capsule will not collapse. * **Administration of Antibiotics:** This is the original cause of the condition. Further antibiotics cannot penetrate the dense, poorly vascularized fibrous wall, making medical management ineffective at this stage. **Clinical Pearls for NEET-PG:** * **Common Site:** Most frequently encountered in the **breast** (following inadequate treatment of a breast abscess). * **Clinical Mimic:** In the breast, an antibioma can clinically mimic a **carcinoma** due to its firm, fixed nature; hence, excision and biopsy are crucial. * **Prevention:** The gold standard for abscess management is always **Incision and Drainage (I&D)**; antibiotics should be an adjunct, not a replacement for drainage.

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: A cold abscess in the chest wall is most commonly associated with which of the following conditions?

Tuberculosis of the spine. ### Explanation **Correct Option: A. Tuberculosis of the spine** The term **"cold abscess"** refers to an abscess that lacks the traditional signs of acute inflammation (heat, redness, and pain), typically caused by *Mycobacterium tuberculosis*. In the context of the chest wall, the most common source is **Tuberculosis of the spine (Pott’s disease)**, specifically involving the thoracic vertebrae. The infection tracks from the vertebral bodies along the path of least resistance. The pus follows the **intercostal nerves and vessels**, traveling laterally and anteriorly within the neurovascular bundle to point on the chest wall. This is a classic example of a "wandering abscess." **Analysis of Incorrect Options:** * **B. Tuberculosis of the rib:** While TB of the rib can cause a localized chest wall abscess, it is statistically less common than spinal involvement tracking forward. * **C. Tuberculosis of the pelvis:** Pelvic TB (e.g., of the lumbar spine or sacroiliac joint) typically tracks downward along the psoas sheath to manifest as a **psoas abscess** in the groin or thigh, not the chest wall. * **D. Tuberculosis of the pleura:** Pleural TB usually results in pleural effusion or empyema necessitans (pus tracking through the chest wall), but it is a less frequent primary source for a classic "cold abscess" compared to the spine. **Clinical Pearls for NEET-PG:** * **Pott’s Paraplegia:** The most serious complication of spinal TB. * **Psoas Abscess:** Often originates from TB of the **T12–L5** vertebrae. * **Investigation of Choice:** MRI is the gold standard for visualizing spinal TB and soft tissue extensions. * **Treatment:** Multidrug Anti-Tubercular Therapy (ATT) is the mainstay; surgical drainage is reserved for neurological deficit or non-response to drugs.

Q: Elective cholecystectomy is classified as which type of surgical wound?

Clean & contaminated. **Explanation:** The classification of surgical wounds is based on the degree of microbial contamination at the time of surgery. This is a high-yield topic for NEET-PG as it predicts the risk of Surgical Site Infection (SSI). **Why "Clean-Contaminated" is correct:** A **Clean-Contaminated (Class II)** wound occurs when a hollow viscus (respiratory, alimentary, genital, or urinary tract) is entered under controlled conditions without unusual contamination. In an **elective cholecystectomy**, the surgeon intentionally enters the biliary tract (part of the alimentary system). Since the procedure is elective, there is no active infection (acute cholecystitis) or major break in technique, placing it squarely in Class II. **Analysis of Incorrect Options:** * **Clean (Class I):** These are uninfected operative wounds where no inflammation is encountered and the respiratory, alimentary, genital, or urinary tracts are **not** entered (e.g., Hernioplasty, Thyroidectomy). * **Contaminated (Class III):** These involve fresh, open accidental wounds, major breaks in sterile technique, or gross spillage from the GI tract. If a cholecystectomy involved "spillage of infected bile," it would be upgraded to this class. * **Dirty (Class IV):** These involve old traumatic wounds with retained devitalized tissue or existing clinical infection/perforation (e.g., perforated diverticulitis or a gallbladder abscess). **Clinical Pearls for NEET-PG:** 1. **SSI Risk:** Clean (<2%), Clean-contaminated (<10%), Contaminated (15-20%), Dirty (up to 40%). 2. **Prophylactic Antibiotics:** Usually indicated for Class II and III. For Class IV, the treatment is considered "therapeutic" rather than "prophylactic." 3. **Emergency Factor:** An elective cholecystectomy is Class II, but an emergency cholecystectomy for **acute cholecystitis** is often classified as **Contaminated (Class III)** due to active inflammation.

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).

Question 1

Which of the following is NOT considered a risk factor for developing Surgical Site Infections (SSIs)?

Accepted Answer

General anesthesia

Answer

Prolonged duration of procedure

Answer

Malnutrition

Answer

Bacterial contamination

Question 2

Antibioma is best treated by?

Accepted Answer

Complete resection

Answer

Partial resection

Answer

Aspiration

Answer

Administration of antibiotics

Question 3

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 4

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 5

A cold abscess in the chest wall is most commonly associated with which of the following conditions?

Accepted Answer

Tuberculosis of the spine

Answer

Tuberculosis of the rib

Answer

Tuberculosis of the pelvis

Answer

Tuberculosis of the pleura

Question 6

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 7

Elective cholecystectomy is classified as which type of surgical wound?

Accepted Answer

Clean & contaminated

Answer

Clean

Answer

Dirty

Answer

Contaminated

Question 8

What is the most common organism seen in peritonitis?

Accepted Answer

Escherichia coli

Answer

Clostridium welchii

Answer

Staphylococci

Answer

Klebsiella

Question 9

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 10

Which of the following complications is not seen with peritonitis?

Accepted Answer

Bone Marrow suppression

Answer

Renal Failure

Answer

Residual abscess

Answer

Endotoxic shock

Surgical Infections — MCQs

Surgical Infections — MCQs

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