Surgical Infections Practice Questions

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.

Q: Which of the following can precipitate an anaerobic infection?

All of the above. **Explanation:** The core requirement for the growth and multiplication of **obligate anaerobes** is a low oxygen tension environment (low redox potential or Eh). Under normal physiological conditions, healthy tissue is well-oxygenated, which inhibits the growth of these organisms. **Why "All of the Above" is correct:** Anaerobic infections are typically endogenous and occur when normal mucosal barriers are breached and the local environment becomes hypoxic. * **Trauma (Option A):** Physical injury disrupts the integrity of skin or mucosa, allowing commensal anaerobes to enter deeper tissues. It also causes local edema and hemorrhage, which increases tissue pressure and reduces oxygen delivery. * **Impaired Circulation (Option B):** Ischemia is a primary driver for anaerobic growth. Reduced blood flow (due to vascular disease, tight dressings, or shock) leads to a rapid drop in tissue oxygen levels, creating an ideal niche for organisms like *Bacteroides* or *Clostridium*. * **Tissue Necrosis (Option C):** Dead tissue lacks a blood supply and serves as a nutrient-rich, oxygen-free medium. Necrotic debris further lowers the redox potential, facilitating the rapid spread of infection. **Clinical Pearls for NEET-PG:** * **Synergy:** Anaerobic infections are often **polymicrobial**. Aerobic bacteria (like *E. coli*) consume available oxygen, further lowering the redox potential and "paving the way" for anaerobes. * **Clinical Clues:** Foul-smelling (putrid) discharge, gas in tissues (crepitus), and infection near mucosal surfaces are hallmarks of anaerobic involvement. * **Common Pathogens:** *Bacteroides fragilis* (most common in intra-abdominal sepsis) and *Clostridium perfringens* (gas gangrene). * **Treatment:** Requires surgical debridement (to remove necrotic tissue/restore Eh) and antibiotics like Metronidazole, Clindamycin, or Carbapenems.

Q: What is the classification of Type IIIc according to the Southam grading system?

Large volume of serosanguinous discharge. The **Southam grading system** is a clinical classification used to assess the severity of surgical site infections (SSIs) based on the nature and volume of wound discharge and the presence of inflammation. ### Explanation of the Correct Answer **Option B (Large volume of serosanguinous discharge)** is the correct definition for **Type IIIc**. In the Southam system, Type III is characterized by serosanguinous discharge. This is further sub-classified by duration and volume: * **IIIa:** Prolonged serosanguinous discharge. * **IIIb:** Intermittent serosanguinous discharge. * **IIIc:** Large volume of serosanguinous discharge. ### Why Other Options are Incorrect * **Option A (Erythema along sutures):** This corresponds to **Type I** (Minor inflammation/Redness). * **Option C (Prolonged serosanguinous discharge):** This corresponds to **Type IIIa**. * **Option D (Pus at one point):** This corresponds to **Type IV** (Minor clinical infection/Localized pus). ### High-Yield Facts for NEET-PG The Southam Grading is a frequent "match the following" or "direct recall" topic. Memorize this simplified table: | Grade | Clinical Feature | | :--- | :--- | | **Type 0** | Normal healing | | **Type I** | Erythema/Redness along sutures | | **Type II** | Erythema with induration | | **Type III** | Serosanguinous discharge (**IIIa:** Prolonged; **IIIb:** Intermittent; **IIIc:** Large volume) | | **Type IV** | Minor infection (Pus at one point 2cm or deep-seated) | **Clinical Pearl:** While the CDC classification (Superficial, Deep, Organ Space) is the gold standard for reporting SSIs, the Southam system remains high-yield for exams focusing on clinical wound assessment. Large volume serosanguinous discharge (IIIc) is often a precursor to wound dehiscence.

Q: Cytokines are secreted in sepsis and Systemic Inflammatory Response syndrome (SIRS) by which of the following?

Neutrophils. ### Explanation In the context of sepsis and Systemic Inflammatory Response Syndrome (SIRS), the body’s innate immune system is activated to release a cascade of inflammatory mediators. **Neutrophils** (along with macrophages and monocytes) are the primary cellular sources of cytokines. When triggered by Pathogen-Associated Molecular Patterns (PAMPs) or Damage-Associated Molecular Patterns (DAMPs), these leukocytes secrete pro-inflammatory cytokines such as **TNF-α, IL-1, and IL-6**. These mediators are responsible for the systemic manifestations of SIRS, including fever, tachycardia, and vasodilation. **Analysis of Incorrect Options:** * **B. Adrenal gland:** While the adrenal glands are crucial in the stress response (secreting cortisol and catecholamines like adrenaline), they do not primarily secrete cytokines. Cortisol actually functions to *downregulate* the cytokine response. * **C. Platelets:** Platelets are primarily involved in hemostasis and the release of growth factors (like PDGF). While they interact with leukocytes, they are not the principal source of the systemic cytokines defining SIRS. * **D. Collecting duct:** This is a functional unit of the kidney involved in water reabsorption and electrolyte balance; it has no role in cytokine production during sepsis. **NEET-PG High-Yield Pearls:** * **TNF-α (Tumor Necrosis Factor-alpha):** The first and most important cytokine released in the systemic inflammatory response. * **IL-6:** The primary cytokine responsible for inducing the **Acute Phase Response** (e.g., stimulating the liver to produce CRP). * **SIRS Criteria:** Defined by abnormalities in temperature, heart rate, respiratory rate, and WBC count (often driven by neutrophil activity). * **Macrophage:** Often considered the "master orchestrator" of the cytokine storm alongside neutrophils.

Q: An abscess that arises from a tuberculous origin is known as which of the following?

Cold abscess.. **Explanation:** A **Cold Abscess** is a hallmark clinical presentation of tuberculosis (TB). Unlike pyogenic abscesses, which are characterized by the classic signs of inflammation—heat, redness, and pain—a tuberculous abscess lacks these features because it does not trigger an acute inflammatory response. It is formed by the liquefaction necrosis (caseation) of tuberculous granulomas, most commonly occurring in the cervical lymph nodes or as a result of spinal tuberculosis (Pott’s disease). **Analysis of Options:** * **Cold Abscess (Correct):** It is "cold" because there is no overlying warmth or erythema. It is typically fluctuant and may eventually track to the skin. * **Collar Stud Abscess:** This is a specific *stage* of a cold abscess. It occurs when a deep-seated tuberculous lymph node ruptures through the deep fascia, creating a superficial collection connected to the deep one by a narrow track. While related to TB, "Cold Abscess" is the broader term for the origin itself. * **Cystic Hygroma:** A congenital multilocular lymphatic malformation, usually found in the posterior triangle of the neck in children. It transilluminates brilliantly. * **Laryngocele:** A dilatation of the laryngeal saccule filled with air (or mucus). It presents as a neck swelling that increases in size with increased endolaryngeal pressure (e.g., Valsalva maneuver). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Cervical lymph nodes (Scrofula). * **Pott’s Disease:** A cold abscess in the lumbar spine may track down the psoas sheath to present as a swelling in the groin (**Psoas Abscess**). * **Management:** Never perform simple Incision and Drainage (I&D) for a cold abscess, as it leads to a persistent **non-healing sinus**. The preferred treatment is aspiration through healthy skin (Z-track technique) and Anti-Tubercular Therapy (ATT).

Q: What is bacteremia?

All of the above. **Explanation:** Bacteremia is defined as the presence of viable bacteria in the bloodstream. It is a critical concept in surgical infections, often serving as the precursor to sepsis. * **Option A:** Anastomotic breakdown (e.g., after a bowel resection) leads to the leakage of contaminated contents into the peritoneal cavity. This results in peritonitis, where the high bacterial load and inflammatory response facilitate the translocation of bacteria into the systemic circulation, causing bacteremia. * **Option B:** This is a high-yield clinical fact. Bacteria in the blood can seed onto foreign bodies via "hematogenous spread." Patients with prosthetic heart valves, joint replacements, or vascular grafts are at high risk of developing **biofilm-associated infections**, which are notoriously difficult to treat and often require surgical removal of the prosthesis. * **Option C:** If the host immune response fails to contain the bacteremia, it progresses to **Sepsis** and **Septic Shock**. This triggers a systemic inflammatory response syndrome (SIRS) that leads to multi-organ dysfunction syndrome (MODS) and potential organ failure (renal, hepatic, or respiratory). Since all statements accurately describe the clinical implications and risks associated with bacteremia, **Option D** is the correct answer. **NEET-PG High-Yield Pearls:** * **Transient Bacteremia:** Can occur even during routine activities like tooth brushing or minor procedures like catheterization. * **Sepsis vs. Bacteremia:** Bacteremia is a microbiological diagnosis (positive blood culture), whereas sepsis is a clinical diagnosis (organ dysfunction caused by a dysregulated host response to infection). * **Most common cause of Catheter-Related Bloodstream Infection (CRBSI):** *Staphylococcus epidermidis* (Coagulase-negative Staph).

Question 1

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

Question 2

Which of the following can precipitate an anaerobic infection?

Accepted Answer

All of the above

Answer

Trauma

Answer

Impaired circulation

Answer

Tissue necrosis

Question 3

Phlegmon; all are true except?

Accepted Answer

It is a rapidly spreading infection of subcutaneous tissue due to micro-organisms like staphylococci.

Answer

The tissue is tender, painful, and hard to touch.

Answer

Pain, fever, and malaise are aggressive.

Answer

Is caused due to micro-organisms which are capable of producing hyaluronidase that breaks down the intercellular cementing substance hyaluronic acid.

Question 4

What is the classification of Type IIIc according to the Southam grading system?

Accepted Answer

Large volume of serosanguinous discharge

Answer

Erythema along sutures

Answer

Prolonged serosanguinous discharge

Answer

Pus at one point

Question 5

Cytokines are secreted in sepsis and Systemic Inflammatory Response syndrome (SIRS) by which of the following?

Accepted Answer

Neutrophils

Answer

Adrenal gland

Answer

Platelets

Answer

Collecting duct

Question 6

In a surgical patient, which of the following is NOT a cause of non-surgical infection?

Accepted Answer

Wound infection

Answer

Lower respiratory tract infection

Answer

Clostridium difficile diarrhea

Answer

Urinary tract infection

Question 7

An abscess that arises from a tuberculous origin is known as which of the following?

Accepted Answer

Cold abscess.

Answer

Cystic hygroma.

Answer

Collar stud abscess.

Answer

Laryngocele.

Question 8

Following a boating injury in an industrial-use river, a patient presents with fever, tachycardia, and a rapidly expanding area of erythema, blistering, and drainage from a flank wound. An x-ray shows gas in the soft tissues. Which of the following measures is most appropriate?

Accepted Answer

Wide debridement

Answer

Administration of an antifungal agent

Answer

Administration of antitoxin

Answer

Administration of hyperbaric oxygen

Question 9

Which organism is responsible for the destruction of skin grafts?

Accepted Answer

Streptococcus

Answer

Staphylococcus

Answer

Pseudomonas

Answer

Clostridium

Question 10

What is bacteremia?

Accepted Answer

All of the above

Answer

Common after anastomotic breakdown

Answer

Dangerous if the patient has a prosthesis, which can become infected

Answer

May be associated with systemic organ failure

Surgical Infections — MCQs

Surgical Infections — MCQs

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