Surgical Infections Practice Questions

Q: What is a felon?

Infection of the pulp space. **Explanation:** A **felon** is an acute, closed-space infection of the **pulp space** of the fingertip. The pulp space is anatomically unique because it is divided into numerous small, non-compliant compartments by tough fibrous septa that extend from the periosteum of the distal phalanx to the skin. When infection occurs (usually due to *Staphylococcus aureus* following a minor prick), the resulting inflammatory edema causes a rapid rise in pressure within these tight compartments. This leads to intense, throbbing pain and can compromise local blood flow, potentially resulting in **necrosis** or **osteomyelitis** of the distal phalanx. **Analysis of Incorrect Options:** * **Option A (Infection of the nail fold):** This is termed **Paronychia**. It is the most common infection of the hand and involves the soft tissue surrounding the nail plate. * **Option B (Infection of the ulnar bursa):** This refers to a deep space infection of the hand. The ulnar bursa encloses the flexor tendons of the little finger and the common flexor sheath in the palm. * **Option D (Infection of the distal interphalangeal joint):** This is **Septic Arthritis** of the DIP joint, which presents with joint line tenderness and painful restricted range of motion, rather than isolated pulp swelling. **Clinical Pearls for NEET-PG:** * **Management:** Early incision and drainage are critical. The incision is typically made where the tenderness is maximal (lateral longitudinal incision) to avoid damaging the digital nerves and to divide the fibrous septa. * **Complication:** If untreated, the pressure can cause pressure necrosis of the distal 4/5ths of the terminal phalanx (the base is spared as its blood supply comes from the digital artery before it enters the pulp space). * **Kanavel’s Signs:** Remember these are associated with **Flexor Tenosynovitis**, not a felon.

Q: Which of the following is a scoring system for the severity of wound infection?

ASEPSIS score. **Explanation:** The **ASEPSIS score** is a validated objective scoring system used to assess the severity of surgical site infections (SSI). It was originally developed by Wilson et al. to provide a reproducible method for monitoring wound healing. 1. **Why ASEPSIS is correct:** The acronym stands for: **A**dditional treatment, **S**erous discharge, **E**rythema, **P**urulent exudate, **S**eparation of deep tissues, **I**solation of bacteria, and **S**tay in hospital. It assigns numerical points based on clinical observations during the first 5–7 postoperative days and the requirement for interventions (like antibiotics or drainage). A score >20 indicates a minor infection, while >40 indicates a severe infection. 2. **Why the other options are incorrect:** * **PRISMA guidelines:** These are a set of evidence-based minimum items for reporting in systematic reviews and meta-analyses, not a clinical scoring tool. * **Manchester scoring system:** This is used for the clinical assessment of **scars** (e.g., hypertrophic scars or keloids), evaluating parameters like color, contour, and texture. * **POSSUM score:** Standing for "Physiological and Operative Severity Score for the enUmeration of Mortality and morbidity," it is used to predict **surgical risk and outcomes** (mortality/morbidity) rather than specifically grading wound infection. **High-Yield Clinical Pearls for NEET-PG:** * **CDC Definition of SSI:** SSIs are categorized into Superficial Incisional, Deep Incisional, and Organ/Space infections. * **Southampton Scoring System:** Another common system used for grading wound healing and infection. * **Timing:** Most SSIs occur within 30 days of surgery (or up to 1 year if an implant is placed).

Q: What is the most preferred treatment for a pelvic abscess in the cul-de-sac?

Colpotomy. **Explanation:** A pelvic abscess in the **cul-de-sac (Pouch of Douglas)** is a localized collection of pus at the most dependent part of the peritoneal cavity. The management principle for any abscess is "Ubi pus, ibi evacua" (where there is pus, evacuate it). **Why Colpotomy is Correct:** The Pouch of Douglas lies immediately adjacent to the **posterior vaginal fornix**. A **posterior colpotomy** (an incision through the vaginal wall into the pouch) provides the most direct, dependent, and least invasive route for drainage. It allows the abscess to drain via gravity without the morbidity of a major abdominal surgery. In males, the equivalent direct route is via the anterior rectal wall (proctotomy). **Analysis of Incorrect Options:** * **Laparotomy:** This is overly invasive. Opening the entire abdomen risks spreading the localized infection into the general peritoneal cavity (peritonitis) and carries higher postoperative morbidity. * **External Incision and Drainage:** The cul-de-sac is deep within the pelvis; an external skin incision (e.g., abdominal or inguinal) cannot reach this space directly without traversing multiple anatomical layers and organs. * **Antibiotics:** While used as an adjunct, antibiotics alone are usually insufficient for a walled-off abscess. Source control via drainage is mandatory for definitive treatment. **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Pelvic abscesses often present with "diarrhea and mucus" due to irritation of the rectal wall. * **Diagnosis:** The gold standard for initial assessment is a **per-rectal (PR) examination**, which reveals a boggy, tender mass in the rectovesical or rectouterine pouch. * **Modern Alternative:** In contemporary practice, **USG or CT-guided percutaneous drainage** is also a preferred minimally invasive option if a colpotomy is not feasible.

Q: What is the most common site for a carbuncle?

Nape of neck. **Explanation:** A **carbuncle** is an infective gangrene of the subcutaneous tissue, most commonly caused by *Staphylococcus aureus*. It typically presents as a cluster of interconnected furuncles (boils) that form a single inflammatory mass with multiple discharging sinuses (the "sieve-like" appearance). **Why the Nape of the Neck is Correct:** The nape of the neck is the most common site because the **skin is thick and the subcutaneous tissue is dense and fibrous**. In this region, the subcutaneous fat is divided into compartments by strong vertical fibrous septa (retinacula cutis) that anchor the skin to the underlying deep fascia. When an infection occurs, these septa prevent the lateral expansion of pus, forcing it to track vertically toward the surface through multiple openings, leading to the characteristic "honeycomb" appearance. **Analysis of Incorrect Options:** * **Forearm and Calf (A & D):** While these areas can develop furuncles, the subcutaneous tissue is relatively lax compared to the neck. Infections here tend to spread horizontally or localize into a single abscess rather than forming the multiloculated structure of a carbuncle. * **Forehead (B):** The skin on the forehead is thin, and while infections can occur, the specific anatomical arrangement of dense vertical septa required for a classic carbuncle is most prominent on the back of the neck and the back. **Clinical Pearls for NEET-PG:** * **Associated Condition:** Always screen for **Diabetes Mellitus** in a patient presenting with a carbuncle; it is the most common predisposing factor. * **Characteristic Sign:** The **"Sieve-like" or "Honeycomb" appearance** due to multiple discharging points. * **Management:** Treatment involves antibiotics and, if necessary, a **cruciate incision** to debride necrotic tissue. * **Common Sites:** Nape of the neck (most common), followed by the back and shoulders.

Q: What is the primary treatment for streptococcal necrotizing fasciitis?

Surgical debridement. **Explanation:** **Surgical debridement** is the cornerstone of management for necrotizing fasciitis (NF) because it is a surgical emergency. In NF, the infection spreads rapidly along the deep fascia, leading to extensive tissue necrosis and vascular thrombosis. This compromised blood supply creates an ischemic environment where systemic antibiotics cannot reach the site of infection in therapeutic concentrations. Therefore, immediate and aggressive surgical removal of all necrotic tissue is life-saving and takes precedence over pharmacological intervention. **Analysis of Incorrect Options:** * **Penicillin (B):** While *Streptococcus pyogenes* (Group A Strep) remains highly sensitive to Penicillin, it is ineffective as a monotherapy in NF due to the **"Eagle Effect"** (reduced efficacy against slowly dividing bacteria in high-density infections) and poor tissue penetration in necrotic areas. * **Clindamycin (C):** Often added to the regimen because it inhibits bacterial protein synthesis, thereby suppressing the production of potent streptococcal exotoxins (superantigens). However, it is an *adjunct* to surgery, not the primary treatment. * **Metronidazole (D):** This is used to cover anaerobic organisms. While useful in Type I (polymicrobial) NF, it has no activity against *S. pyogenes* (the cause of Type II NF). **High-Yield Clinical Pearls for NEET-PG:** * **Type I NF:** Polymicrobial (Aerobes + Anaerobes); common in diabetics. * **Type II NF:** Monomicrobial (usually *S. pyogenes*); can occur in previously healthy individuals. * **Clinical Sign:** "Pain out of proportion to physical findings" is the classic early red flag. * **LRINEC Score:** Used to distinguish NF from cellulitis based on laboratory parameters (CRP, WBC, Hemoglobin, Sodium, Creatinine, Glucose).

Q: All of the following are included in the criteria for systemic inflammatory response syndrome (SIRS), EXCEPT?

Thrombocytopenia. **Explanation:** The **Systemic Inflammatory Response Syndrome (SIRS)** is a clinical syndrome representing the body's generalized inflammatory response to various insults (infectious or non-infectious). The diagnosis requires at least **two** of the following four criteria: 1. **Temperature:** $>38^\circ\text{C}$ (Hyperthermia) or $ 90$ beats per minute (**Tachycardia**). 3. **Respiratory Rate:** $>20$ breaths per minute or $PaCO_2 12,000/\text{mm}^3$ (Leukocytosis), $ 10\%$ immature (band) forms. **Why Thrombocytopenia is the correct answer:** While thrombocytopenia (low platelet count) is a significant marker for organ dysfunction and is a component of the **SOFA (Sequential Organ Failure Assessment) score** used to define Sepsis-3, it is **not** part of the original SIRS criteria. **Analysis of Incorrect Options:** * **A. Hypothermia:** Included; it reflects a failure of thermoregulation in severe inflammatory states. * **B. Leukopenia:** Included; a low WBC count often signifies overwhelming infection or bone marrow exhaustion. * **C. Tachycardia:** Included; it is one of the earliest and most sensitive signs of systemic stress. **High-Yield Clinical Pearls for NEET-PG:** * **Sepsis-3 Definition:** Sepsis is now defined as life-threatening organ dysfunction caused by a dysregulated host response to infection (SOFA score $\ge 2$). The SIRS criteria are no longer the primary tool for defining sepsis but remain clinically useful for screening. * **qSOFA (Quick SOFA):** Includes Respiratory rate $\ge 22$, Altered Mentation (GCS $<15$), and Systolic BP $\le 100\text{ mmHg}$. * **Most common cause of SIRS:** Infection (Sepsis), but it can also be caused by pancreatitis, trauma, or burns.

Question 1

Surgical wound of trans-alveolar extraction mostly falls under which of these categories?

Accepted Answer

Clean-contaminated

Answer

Clean

Answer

Dirty-infected

Answer

None of the above

Question 2

What is a felon?

Accepted Answer

Infection of the pulp space

Answer

Infection of the nail fold

Answer

Infection of the ulnar bursa

Answer

Infection of the distal interphalangeal joint

Question 3

Which of the following is a scoring system for the severity of wound infection?

Accepted Answer

ASEPSIS score

Answer

PRISMA guidelines

Answer

Manchester scoring system

Answer

POSSUM score

Question 4

What is the most preferred treatment for a pelvic abscess in the cul-de-sac?

Accepted Answer

Colpotomy

Answer

Laparotomy

Answer

External incision and drainage

Answer

Antibiotics

Question 5

What is the most common site for a carbuncle?

Accepted Answer

Nape of neck

Answer

Forearm

Answer

Forehead

Answer

Calf

Question 6

Which of the following statements regarding surgical wounds are TRUE or FALSE?
1. No antibiotics are required in clean surgery.
2. Incision of an abscess is performed in contaminated wounds.
3. Spillage of stomach contents converts a clean/contaminated wound case to a contaminated case.
4. In clean/contaminated wounds, the infection rate is 10%.
5. Hernial repair is considered a contaminated wound.

Accepted Answer

Statements 1, 3, and 4 are true; statements 2 and 5 are false.

Answer

Statements 1, 2, and 3 are true; statements 4 and 5 are false.

Answer

Statements 3, 4, and 5 are true; statements 1 and 2 are false.

Answer

All statements are true.

Question 7

Which of the following statements regarding cellulitis are true?
1. It is commonly caused by Streptococcus pyogenes.
2. It can lead to Systemic Inflammatory Response Syndrome (SIRS).
3. It is a localized infection.
4. Any associated abscess should be drained.
5. Incision and drainage (I&D) should not be performed.

Accepted Answer

Statements 3 and 5 are false, and statements 1, 2, and 4 are true.

Answer

Statements 1, 2, and 3 are true, and statements 4 and 5 are false.

Answer

Statements 1, 3, and 5 are true, and statements 2 and 4 are false.

Answer

Statements 1 and 2 are false, and statements 3, 4, and 5 are true.

Question 8

What is the primary treatment for streptococcal necrotizing fasciitis?

Accepted Answer

Surgical debridement

Answer

Penicillin

Answer

Clindamycin

Answer

Metronidazole

Question 9

A 78-year-old hypertensive, mildly asthmatic man receiving chemotherapy for colon cancer presents with symptomatic gallstones. Preoperative laboratory results revealed a hematocrit of 24% and urinalysis with 18 to 25 WBCs and gram-negative bacteria. Intravenous penicillin was administered preoperatively. The abdomen was shaved in the operating room. An open cholecystectomy was performed, and the common bile duct was explored despite a lack of indications. The wound was closed primarily with a Penrose drain exiting a separate stab wound. On postoperative day 3, the patient developed a wound infection. Which of the following changes in the care of this patient could have decreased the chance of a postoperative wound infection?

Accepted Answer

Treating the urinary infection prior to surgery

Answer

Increasing the length of the preoperative hospital stay to prophylactically treat the asthma with steroids

Answer

Shaving the abdomen the night prior to surgery

Answer

Continuing the prophylactic antibiotics for 3 postoperative days

Question 10

All of the following are included in the criteria for systemic inflammatory response syndrome (SIRS), EXCEPT?

Accepted Answer

Thrombocytopenia

Answer

Hypothermia

Answer

Leukopenia

Answer

Tachycardia

Surgical Infections — MCQs

Surgical Infections — MCQs

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