General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 111: The tensile strength of a wound increases after which time period?

A. Immediately after suturing
B. 3 to 4 weeks (Correct Answer)
C. 10-12 weeks
D. After 6 months

Explanation: ### Explanation The tensile strength of a wound is its ability to resist tearing or breaking under tension. This process is directly linked to the phases of wound healing. **Why 3 to 4 weeks is correct:** Wound healing occurs in three phases: Inflammatory, Proliferative, and Remodeling. During the first 3–5 days (Lag phase), the wound has almost no intrinsic strength and relies entirely on sutures. Significant gain in tensile strength begins during the **Proliferative phase** (Day 5 to 3 weeks) due to collagen synthesis. However, the **maximum rate of increase** in tensile strength occurs between **3 to 4 weeks**, as Type III collagen is replaced by stronger Type I collagen and cross-linking increases. **Analysis of Incorrect Options:** * **A. Immediately after suturing:** At this stage, the wound has zero intrinsic strength. The "strength" is purely mechanical, provided by the suture material, not the tissue itself. * **C. 10-12 weeks:** By this time, the wound has reached about 70–80% of its ultimate strength. While strength continues to increase, the most rapid and clinically significant rise occurs much earlier (by week 4). * **D. After 6 months:** This is late in the remodeling phase. While the scar continues to mature, the rate of strength gain has plateaued. **High-Yield NEET-PG Pearls:** * **The 80% Rule:** A healed wound never regains 100% of the tensile strength of original unwounded skin; it plateaus at approximately **80%** by the end of one year. * **Collagen Shift:** During healing, there is a transition from **Type III collagen** (granulation tissue) to **Type I collagen** (mature scar). * **Suture Removal:** Sutures are typically removed before the wound reaches significant strength (e.g., 5–10 days) to prevent epithelial tracks and scarring, relying on the early proliferative strength to hold the edges.

Question 112: Non-blanchable erythema of the skin is classified as which stage of a decubitus ulcer?

A. Stage I (Correct Answer)
B. Stage II
C. Stage III
D. Stage IV

Explanation: **Explanation:** Decubitus ulcers (pressure sores) are staged based on the depth of tissue involvement according to the National Pressure Ulcer Advisory Panel (NPUAP) guidelines. **1. Why Stage I is correct:** **Stage I** is characterized by **non-blanchable erythema** of intact skin. This means that when pressure is applied to the reddened area, it does not turn white (blanch), indicating that microvascular damage has occurred but the skin barrier remains intact. It is the earliest clinically recognizable stage of a pressure ulcer. **2. Why other options are incorrect:** * **Stage II:** Involves **partial-thickness skin loss** involving the epidermis, dermis, or both. It clinically presents as a shallow open ulcer with a red-pink wound bed or as an intact/ruptured serum-filled blister. * **Stage III:** Involves **full-thickness skin loss**. Subcutaneous fat may be visible, but bone, tendon, or muscle are NOT exposed. Slough may be present. * **Stage IV:** Involves **full-thickness tissue loss** with exposed bone, tendon, or muscle. Osteomyelitis is a common complication at this stage. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** The **Sacrum** is the most common site overall, followed by the ischial tuberosity and greater trochanter. * **Unstageable Ulcer:** If the wound bed is covered by slough or eschar such that the true depth cannot be determined, it is classified as "Unstageable." * **Deep Tissue Injury (DTI):** Presents as a purple or maroon localized area of discolored intact skin or a blood-filled blister due to damage of underlying soft tissue. * **Prevention:** The most effective preventive measure is frequent repositioning (every 2 hours).

Question 113: Odontoma is treated by:

A. Excision (Correct Answer)
B. Resection
C. Curettage
D. Radiotherapy

Explanation: **Explanation:** **Odontomas** are the most common odontogenic tumors. They are technically considered **hamartomas** (developmental malformations of dental tissues) rather than true neoplasms. They consist of enamel, dentin, cementum, and pulp tissue. 1. **Why Excision is Correct:** Odontomas are typically well-encapsulated and separated from the surrounding bone by a thin layer of fibrous connective tissue. Because they are benign, slow-growing, and non-invasive, **simple surgical excision (enucleation)** is the definitive treatment. Once the lesion and its surrounding capsule are removed, the recurrence rate is nearly zero. 2. **Why Incorrect Options are Wrong:** * **Resection:** This involves removing the lesion along with a margin of healthy bone (e.g., segmental resection). This is unnecessarily aggressive for a benign, encapsulated hamartoma like an odontoma and is reserved for aggressive or malignant tumors (e.g., Ameloblastoma). * **Curettage:** While similar to excision, pure curettage (scraping) without removing the entire capsule may lead to incomplete removal of dental fragments. Excision/Enucleation is the standard term for removing the mass in its entirety. * **Radiotherapy:** Odontomas are radioresistant. Radiation is contraindicated for benign dental lesions due to the risk of osteoradionecrosis and secondary malignancies. **NEET-PG High-Yield Pearls:** * **Types:** * **Compound Odontoma:** Multiple small tooth-like structures (denticles); most common in the **anterior maxilla**. * **Complex Odontoma:** An amorphous mass of dental tissue; most common in the **posterior mandible**. * **Radiographic Appearance:** A radiopaque mass surrounded by a narrow **radiolucent halo** (the capsule). * **Clinical Presentation:** Often associated with a **retained deciduous tooth** or an **unerupted permanent tooth**.

Question 114: An Erich arch bar may be used as all of the following except?

A. A bar for intermaxillary fixation
B. A splint for a mobile dentoalveolar segment
C. A compression band (Correct Answer)
D. A tension band

Explanation: ### Explanation The **Erich arch bar** is a semi-rigid stainless steel bar with hooks, commonly used in the management of maxillofacial trauma. It is primarily used to achieve **Intermaxillary Fixation (IMF)** or Mandibulomaxillary Fixation (MMF) to restore the patient's pre-traumatic dental occlusion. **Why "Compression Band" is the Correct Answer:** In the biomechanics of fracture healing, a **compression band** (or compression plating) actively pushes two bone fragments together to promote primary bone healing. An arch bar is applied to the teeth, not directly to the bone fragments in a way that generates active compression across a fracture line. Therefore, it cannot function as a compression band. **Analysis of Incorrect Options:** * **A. Intermaxillary Fixation:** This is the most common use. Arch bars are wired to the upper and lower dental arches, and wires or elastics are then used to bridge the two, locking the jaws together. * **B. Splint for mobile dentoalveolar segment:** Arch bars provide stability to loose teeth or fractured alveolar bone segments by splinting them to adjacent stable teeth. * **D. Tension Band:** When applied to the "tension side" of a mandibular fracture (the alveolar/superior border), the arch bar acts as a **tension band**. It resists the distracting forces of the muscles of mastication, converting them into compressive forces at the lower (basal) border of the mandible. **High-Yield Clinical Pearls for NEET-PG:** * **Material:** Usually made of stainless steel. * **Placement:** The hooks should always point **downward** on the mandible and **upward** on the maxilla to facilitate the placement of wires/elastics. * **Indication:** Indicated in minimally displaced fractures or as an adjunct to Open Reduction Internal Fixation (ORIF). * **Contraindication:** Avoid in patients with severe respiratory distress or those at high risk of emesis (due to aspiration risk if the jaws are wired shut).

Question 115: Which of the following suture materials is absorbable?

A. Polyglactine (Correct Answer)
B. Polypropylene
C. Polyethylene
D. Polybutester

Explanation: **Explanation:** Suture materials are broadly classified into **absorbable** (broken down by the body via hydrolysis or enzymatic digestion) and **non-absorbable** (remain permanently or require manual removal). **Correct Answer: A. Polyglactine** Polyglactine 910 (commonly known by the brand name **Vicryl**) is a synthetic, braided, multifilament **absorbable** suture. It is composed of a copolymer of glycolide and lactide. It is degraded by **hydrolysis**, maintaining significant tensile strength for approximately 3–4 weeks and being completely absorbed within 60–90 days. It is widely used for soft tissue approximation and ligation. **Analysis of Incorrect Options:** * **B. Polypropylene (Prolene):** A synthetic, monofilament **non-absorbable** suture. It has the lowest rates of infection and is the material of choice for vascular anastomoses and skin closure (subcuticular). * **C. Polyethylene:** A synthetic **non-absorbable** suture often used in orthopedic surgeries (e.g., tendon repairs) due to its high tensile strength. * **D. Polybutester (Novafil):** A synthetic **non-absorbable** monofilament suture known for its high elasticity, making it ideal for wound closure where significant edema is expected. **High-Yield Clinical Pearls for NEET-PG:** * **Natural Absorbable:** Catgut (derived from bovine/ovine submucosa). Note: Chromic catgut is treated with chromium salts to delay absorption. * **Fastest Absorbing:** Catgut (5–7 days); **Slowest Absorbing Synthetic:** Polydioxanone (PDS), which takes about 180–210 days. * **Suture of choice for Biliary/Urinary tracts:** Absorbable sutures (to prevent them from acting as a nidus for stone formation). * **Suture of choice for contaminated wounds:** Monofilament (to prevent "wicking" of bacteria seen in braided sutures).

Question 116: Using monopolar cautery during circumcision in children is not advised due to the risk of penile coagulation. What is the mechanism behind this phenomenon?

A. Channeling (Correct Answer)
B. Capacitance coupling
C. Electrocution
D. Explosion

Explanation: **Explanation:** The correct answer is **Channeling (Option A)**. In monopolar cautery, the electrical current travels from the active electrode, through the patient’s body, to a return plate (grounding pad). When used on a narrow, terminal appendage like the penis—especially in children—the current becomes concentrated as it travels through the narrow base of the organ. This "channeling" effect leads to high current density, causing unintended thermal injury, thrombosis of the dorsal penile arteries, and subsequent total penile necrosis or gangrene. For this reason, bipolar cautery or cold dissection is preferred for circumcision. **Analysis of Incorrect Options:** * **B. Capacitance Coupling:** This occurs when current is transferred from an active electrode through intact insulation into adjacent non-target tissues (common in laparoscopy). It is not the primary mechanism of injury in circumcision. * **C. Electrocution:** This refers to a fatal or severe electric shock caused by current passing through the heart or brain, rather than localized tissue coagulation. * **D. Explosion:** This is a risk when cautery is used in the presence of flammable gases (e.g., bowel gas containing methane/hydrogen or alcohol-based skin preps), but it does not describe the mechanism of penile necrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Bipolar Cautery:** Safer for terminal appendages because the current only flows between the two tips of the forceps, eliminating the channeling effect. * **Pacemakers:** Monopolar cautery can interfere with pacemakers; always use bipolar or place the grounding pad far from the heart. * **Direct Coupling:** Occurs when the active electrode accidentally touches another conductive instrument (e.g., a laparoscope), causing injury at a distant site.

Question 117: What is the name of the retractor shown in the image?

A. Deaver retractor (Correct Answer)
B. Richardson retractor
C. Malleable retractor
D. Goulet retractor

Explanation: ***Deaver retractor*** - Features a **large curved flat blade** with a **right-angle handle**, making it ideal for retracting heavy organs like the liver during abdominal surgery. - Commonly used in **laparotomy** procedures to provide excellent exposure of deep abdominal structures. *Richardson retractor* - Has a **straight blade** with a curved handle, unlike the distinctive right-angle configuration of the Deaver. - Primarily used for **superficial tissue retraction** rather than deep organ manipulation. *Malleable retractor* - Made of **flexible metal** that can be bent and shaped according to surgical needs during the procedure. - Lacks the **rigid curved blade** and fixed right-angle handle characteristic of the Deaver retractor. *Goulet retractor* - Features **multiple prongs** or **teeth** for grasping tissue, completely different from the smooth blade design. - Used for **tissue grasping** rather than the broad retraction provided by flat-bladed retractors.

Question 118: Chemical cauterization in odontogenic keratocyst is done by?

A. Hydrogen peroxide
B. Carnoy's solution (Correct Answer)
C. Superoxide solution
D. Betadine

Explanation: **Explanation:** **Odontogenic Keratocyst (OKC)** is known for its high recurrence rate due to its thin, friable lining and the presence of "daughter cysts" or "satellite cysts" in the surrounding bony wall. To minimize recurrence after enucleation, chemical cauterization is employed to eliminate these residual microscopic cells. **Why Carnoy’s Solution is Correct:** Carnoy’s solution is the gold standard for chemical cauterization in OKC. It is a potent fixative composed of **absolute alcohol, chloroform, glacial acetic acid, and ferric chloride**. It penetrates the bone to a depth of approximately 1.5 mm, effectively devitalizing any remaining epithelial remnants or satellite cysts without causing extensive bone necrosis. **Analysis of Incorrect Options:** * **A. Hydrogen peroxide:** While used as a hemostatic agent and for wound debridement, it lacks the tissue-fixing properties required to penetrate bone and prevent cyst recurrence. * **C. Superoxide solution:** These are typically used as high-level disinfectants for instruments or topical antiseptics; they do not have a role in chemical bone cauterization. * **D. Betadine (Povidone-iodine):** This is a standard antiseptic used for skin preparation and wound irrigation. It does not possess the chemical potency to fix tissues or treat odontogenic tumors. **NEET-PG High-Yield Pearls:** * **Modified Carnoy’s Solution:** Due to the carcinogenic potential of chloroform, it is often omitted in modern practice (Modified Carnoy’s). * **Recurrence:** OKC has a recurrence rate of up to 30-60% with simple enucleation; Carnoy’s solution significantly reduces this. * **Association:** Multiple OKCs are a hallmark of **Gorlin-Goltz Syndrome** (Nevoid Basal Cell Carcinoma Syndrome). * **Alternative:** Liquid nitrogen (cryosurgery) is another method used to achieve similar results.

Question 119: Pain of dry socket is typically experienced when?

A. On the 1st day after extraction
B. On the 2nd day after extraction
C. On the 3rd day after extraction (Correct Answer)
D. After 7 days

Explanation: **Explanation:** **Dry Socket**, clinically known as **Alveolar Osteitis**, is a common post-extraction complication where the blood clot fails to form or is prematurely dislodged from the extraction site. This leaves the underlying alveolar bone and nerve endings exposed to the oral environment. 1. **Why Option C is Correct:** The pain of dry socket typically manifests **2 to 4 days (most commonly the 3rd day)** after the tooth extraction. This timing corresponds to the period when fibrinolysis occurs. If the initial blood clot is lysed by plasmin (activated by tissue activators), the socket becomes "dry." The pain is characteristically severe, radiating, and associated with a foul odor (halitosis). 2. **Why Other Options are Incorrect:** * **Option A & B:** On the 1st and 2nd days, the patient usually experiences normal post-operative soreness, which is manageable with analgesics. The specific pathological process of clot disintegration in Alveolar Osteitis takes more than 48 hours to manifest clinically. * **Option D:** By the 7th day, normal granulation tissue has usually begun to cover the socket. Pain starting this late is more likely indicative of a secondary infection or osteomyelitis rather than classic dry socket. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (most significant), use of oral contraceptives, traumatic extraction (especially mandibular 3rd molars), and poor oral hygiene. * **Pathophysiology:** Increased **fibrinolytic activity** leading to the dissolution of the blood clot. * **Management:** The treatment is symptomatic. It involves gentle irrigation with warm saline and placement of a medicated dressing (e.g., **Zinc Oxide Eugenol** or Alveogyl) to soothe the exposed bone. Antibiotics are generally not required unless systemic signs of infection are present.

Question 120: In an adult, what percentage of total body surface area must be involved in a burn injury to cause shock?

A. 15% (Correct Answer)
B. 20%
C. 25%
D. 30%

Explanation: **Explanation:** The correct answer is **15%**. In an adult, a burn involving 15% or more of the Total Body Surface Area (TBSA) is sufficient to cause **hypovolemic (burn) shock**. **1. Why 15% is correct:** Burn shock is a complex combination of hypovolemic and distributive shock. When a burn exceeds 15% TBSA in adults (or 10% in children), the systemic inflammatory response leads to widespread capillary leak. This "third-spacing" results in massive fluid shifts from the intravascular compartment to the interstitial space. At the 15% threshold, the plasma loss is significant enough to cause hemodynamic instability, necessitating formal intravenous fluid resuscitation (e.g., Parkland Formula). **2. Why other options are incorrect:** * **20%:** While 20% is a significant burn and certainly causes shock, it is not the *minimum* threshold. In clinical practice, 20% is often the cutoff for initiating more aggressive monitoring, but shock physiology begins at 15%. * **25% & 30%:** These percentages represent major burns with a high risk of multi-organ dysfunction syndrome (MODS) and mortality, but the onset of burn shock occurs much earlier. **Clinical Pearls for NEET-PG:** * **Threshold for Fluid Resuscitation:** IV fluids are mandatory for burns **>15% in adults** and **>10% in children**. * **Parkland Formula:** $4 \text{ ml} \times \text{Body Weight (kg)} \times \% \text{ TBSA}$. Give half in the first 8 hours and the remainder over the next 16 hours. * **Fluid of Choice:** Ringer’s Lactate is the preferred crystalloid in the first 24 hours. * **Rule of nines:** Used for quick TBSA estimation; remember that the patient's palm (including fingers) represents approximately 1%.

Practice by Chapter

Wound Healing and Care

Practice Questions

Surgical Infections

Practice Questions

Fluid and Electrolyte Management

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Nutrition in Surgical Patients

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Hemostasis and Blood Transfusion

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Surgical Instruments and Equipment

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Sutures and Stapling Devices

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Minimal Access Surgery Principles

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Surgical Complications

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Anesthesia Principles for Surgeons

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Surgical Oncology Principles

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Evidence-Based Surgery

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