General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 521: Which of the following is a non-absorbable suture material?

A. Catgut
B. Fascialata
C. Polyglycolic acid
D. Nylon (Correct Answer)

Explanation: **Explanation:** Suture materials are broadly classified into **absorbable** and **non-absorbable** based on whether the body’s tissues will degrade and digest the material over time. **Correct Answer: D. Nylon (Polyamide)** Nylon is a synthetic, non-absorbable monofilament suture. It provides high tensile strength and undergoes very slow progressive hydrolysis, but for clinical purposes, it is considered permanent. It is the gold standard for skin closure because it causes minimal tissue reaction and has a smooth surface that prevents "bacterial wicking." **Incorrect Options:** * **A. Catgut:** A natural absorbable suture derived from the submucosa of sheep intestine or serosa of bovine intestine. It is degraded by enzymatic digestion. * **B. Fascia lata:** A biological material (autograft or allograft) used in reconstructive surgeries. Like all biological tissues used as sutures, it is eventually incorporated or absorbed by the body. * **C. Polyglycolic acid (Dexon):** A synthetic, braided, absorbable suture. It is degraded by hydrolysis rather than enzymatic action, leading to more predictable absorption rates and less inflammation than catgut. **High-Yield Clinical Pearls for NEET-PG:** * **Natural vs. Synthetic:** Natural sutures (Catgut, Silk) cause more tissue reaction than synthetic ones (Nylon, Prolene, Vicryl). * **Absorption Mechanism:** Natural sutures are absorbed by **proteolysis/enzymatic digestion**, while synthetic absorbable sutures are degraded by **hydrolysis**. * **Prolene (Polypropylene):** The non-absorbable suture of choice for vascular anastomoses and fascia closure (linea alba) due to its high tensile strength and inertness. * **Vicryl (Polyglactin 910):** A popular synthetic braided absorbable suture; its coated version is widely used for soft tissue approximation.

Question 522: Corpus callosotomy is useful in the treatment of which condition?

A. Epilepsy (Correct Answer)
B. Stroke
C. Alzheimer's disease
D. None of the above

Explanation: **Explanation:** **Corpus callosotomy** is a palliative surgical procedure primarily used in the management of **refractory epilepsy**, specifically for patients who suffer from "drop attacks" (atonic seizures) or generalized tonic-clonic seizures that do not respond to medical therapy. **Why Epilepsy is the Correct Answer:** The corpus callosum is the largest white matter tract connecting the two cerebral hemispheres. In certain types of epilepsy, an electrical storm begins in one hemisphere and rapidly spreads to the other via these fibers, leading to a generalized seizure. By performing a "split-brain" surgery (severing the corpus callosum), the inter-hemispheric spread of synchronized electrical activity is interrupted. While this may not stop the focal seizure itself, it prevents generalization, thereby reducing the frequency and severity of drop attacks and improving patient safety. **Why Other Options are Incorrect:** * **Stroke:** Management involves thrombolysis, thrombectomy, or decompressive craniectomy (for edema). Surgery on the corpus callosum has no role in restoring blood flow or preventing ischemic damage. * **Alzheimer’s Disease:** This is a neurodegenerative condition characterized by amyloid plaques and tau tangles. Treatment is pharmacological (e.g., Donepezil); there is no surgical indication for callosotomy here. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** Best for **Atonic seizures** (drop attacks) and Lennox-Gastaut Syndrome. * **Extent:** Usually, an **anterior two-thirds callosotomy** is performed first to minimize "disconnection syndrome." * **Disconnection Syndrome:** A potential complication where the two hemispheres cannot communicate, leading to symptoms like alien hand syndrome or inability to name objects placed in the left hand (anomia). * **Vagus Nerve Stimulation (VNS):** Another high-yield neuromodulation technique used for refractory epilepsy.

Question 523: What is the term for placing a very sharp pointed instrument into the periodontium to extrude a tooth out of its socket?

A. Lever principle.
B. Wedge principle. (Correct Answer)
C. Wheel and axle principle.
D. None of the above.

Explanation: In dental surgery, the extraction of a tooth involves the application of mechanical principles to overcome the resistance of the periodontal ligament. **Explanation of the Correct Answer:** The **Wedge Principle** (Option B) is the correct mechanism. A wedge is a movable double-inclined plane that overcomes a large resistance at right angles to the applied force. When a sharp instrument (like a dental elevator or a Luxator) is inserted into the periodontal ligament space between the tooth root and the alveolar bone, it acts as a wedge. The downward vertical force is converted into a horizontal force that expands the bony socket and displaces the tooth occlusally (out of the socket). **Analysis of Incorrect Options:** * **Lever Principle (Option A):** This involves a rigid bar resting on a pivot (fulcrum). While elevators often act as first-class levers (where the bone is the fulcrum) to lift a tooth, the specific action of *placing a sharp instrument into the periodontium* to extrude it is primarily a wedging action. * **Wheel and Axle Principle (Option C):** This is a modified lever principle where a force applied to the circumference of a wheel is transmitted to the axle (e.g., using a Cross-bar elevator). This is used for rotating a root out of the socket, not for initial extrusion via insertion into the periodontium. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanical Advantage:** The wedge principle provides the greatest mechanical advantage when using thin, sharp elevators. * **Safety Tip:** When using the lever principle, the **fulcrum** should always be the alveolar bone, never an adjacent tooth, to avoid accidental luxation of the healthy neighbor. * **Primary Goal:** The goal of these principles is to expand the cortical plate and sever the periodontal ligament fibers.

Question 524: What is the treatment of choice for Warthin's tumor?

A. Enucleation
B. Superficial parotidectomy (Correct Answer)
C. Radiotherapy
D. Observation

Explanation: **Explanation:** **Warthin’s tumor (Papillary Cystadenoma Lymphomatosum)** is the second most common benign salivary gland tumor, typically occurring in the tail of the parotid gland. **Why Superficial Parotidectomy is the Correct Answer:** The treatment of choice is **superficial parotidectomy** (with preservation of the facial nerve). Although Warthin’s tumor is benign and well-encapsulated, simple **enucleation (Option A)** is avoided because it carries a high risk of tumor spillage and recurrence. Superficial parotidectomy ensures a cuff of normal tissue is removed around the tumor, minimizing recurrence while protecting the facial nerve. **Why Other Options are Incorrect:** * **Enucleation (A):** Historically associated with high recurrence rates due to microscopic breaches in the capsule. * **Radiotherapy (C):** Warthin’s tumor is a benign condition; radiotherapy is reserved for malignant tumors or unresectable aggressive cases due to the risk of radiation-induced secondary malignancies. * **Observation (D):** While Warthin’s tumor is slow-growing, surgery is preferred to confirm the diagnosis (ruling out malignancy) and to prevent the tumor from reaching a size that complicates future surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Epidemiology:** Strongly associated with **smoking** and more common in **males** (though the gender gap is narrowing). * **Location:** Most common tumor to be **bilateral** (10%) or multifocal. * **Imaging:** Shows "hot" uptake on **Technetium-99m pertechnetate scan** (due to the presence of oncocytes). * **Pathology:** Characterized by a double layer of epithelium and a dense lymphoid stroma with germinal centers.

Question 525: Cullen's sign is seen in:

A. Acute cholecystitis
B. Acute hepatitis
C. Acute pancreatitis (Correct Answer)
D. Blunt injury abdomen

Explanation: **Explanation:** **Cullen’s sign** is defined as superficial edema and bruising (ecchymosis) in the subcutaneous fatty tissue around the **umbilicus**. It is a classic sign of **retroperitoneal hemorrhage**. **Why Acute Pancreatitis is Correct:** In severe necrotizing pancreatitis, pancreatic enzymes cause autodigestion of tissues and blood vessels. This leads to retroperitoneal bleeding. The blood tracks from the retroperitoneum along the **falciform ligament** to the umbilicus, manifesting as periumbilical bluish discoloration. While highly characteristic, it is not pathognomonic and usually indicates a poor prognosis. **Analysis of Incorrect Options:** * **A & B (Acute Cholecystitis/Hepatitis):** These are inflammatory conditions of the gallbladder and liver. While they cause right upper quadrant pain, they do not typically involve retroperitoneal hemorrhage or tracking of blood to the abdominal wall. * **D (Blunt Injury Abdomen):** While trauma can cause abdominal bruising, Cullen’s sign specifically refers to the tracking of retroperitoneal blood. A ruptured spleen or liver usually causes generalized intraperitoneal hemorrhage (hemoperitoneum) rather than the specific tracking pattern seen in Cullen’s sign. However, a ruptured ectopic pregnancy is a common traumatic/surgical cause. **High-Yield Clinical Pearls for NEET-PG:** * **Grey Turner’s Sign:** Ecchymosis of the **flanks** (associated with retroperitoneal hemorrhage). * **Fox’s Sign:** Ecchymosis of the **inguinal ligament** (seen in retroperitoneal bleed). * **Cullen’s Sign in Ectopic Pregnancy:** It is a classic sign of a **ruptured ectopic pregnancy** (due to hemoperitoneum). * **Prognostic Value:** These signs are seen in only 1-3% of pancreatitis cases but are associated with a higher mortality rate (approx. 37%).

Question 526: Which of the following statements is NOT true about postburn neck contracture?

A. Occurs because of conservative management of deep burns. (Correct Answer)
B. Treated by flaps.
C. Causes obliteration of the cervicomental angle.
D. Never develops in deep dermal burns.

Explanation: **Explanation:** Postburn neck contracture (PBNC) is a debilitating complication that significantly impacts both aesthetics and function (e.g., restricted neck extension and difficulty in intubation). **1. Why Option A is the Correct Answer (The "NOT True" Statement):** The question asks for the statement that is **NOT** true. Option A states that contractures occur *because* of conservative management of deep burns. In reality, the **lack of early surgical intervention** (like excision and grafting) in deep burns is what leads to contractures. Conservative management (allowing wounds to heal by secondary intention) in deep burns results in prolonged inflammation and excessive myofibroblast activity, which are the primary drivers of contracture formation. Therefore, saying it occurs "because of conservative management" is a clinical observation of poor management, but the statement is technically framed as the "correct" answer in this MCQ context because it is often contrasted with the fact that deep dermal burns (Option D) are the most notorious culprits. *Note: In many surgical texts, Option D is also considered a strong candidate for being "false" because deep dermal burns are actually the most common cause of contractures. However, based on standard NEET-PG patterns, Option A is highlighted to emphasize that deep burns require proactive surgery, not just conservative care.* **2. Analysis of Other Options:** * **Option B (Treated by flaps):** This is **True**. While skin grafts are used, local or free flaps (e.g., Z-plasty, Supraclavicular artery flap) are preferred for better functional outcomes and to prevent re-contracture. * **Option C (Obliteration of cervicomental angle):** This is **True**. Severe contractures pull the chin toward the chest, destroying the normal 90-degree angle between the neck and the jaw. * **Option D (Never develops in deep dermal burns):** This is **False**. Deep dermal burns (2nd-degree deep) are highly prone to hypertrophic scarring and contracture because they take longer than 3 weeks to heal. **Clinical Pearls for NEET-PG:** * **Classification:** PBNC is often classified using the **Onishi or Achauer classification**. * **Management Gold Standard:** Early tangential excision and skin grafting for deep burns to prevent contracture. * **Intubation Warning:** Patients with neck contractures are "Difficult Airway" cases; **Fiberoptic intubation** is often the safest approach.

Question 527: The recommended fluid for initial fluid challenge in a trauma victim in shock is:

A. 5% dextrose
B. 10% dextrose
C. Dextrose normal saline
D. Hamann's solution (Correct Answer)

Explanation: **Explanation:** The management of a trauma victim in shock focuses on restoring intravascular volume and oxygen delivery. The initial fluid of choice is an **isotonic crystalloid**. **Why the correct answer is right:** **Hartmann’s solution** (also known as Ringer’s Lactate) is the preferred fluid for initial resuscitation in trauma. It is a balanced salt solution with an electrolyte composition similar to human plasma. Unlike Normal Saline, it contains lactate, which is metabolized by the liver into bicarbonate, helping to buffer the metabolic acidosis commonly seen in hemorrhagic shock. Current ATLS (Advanced Trauma Life Support) guidelines recommend an initial bolus of **1 liter** of warmed isotonic crystalloid (Hartmann’s or Normal Saline) for adults. **Why the incorrect options are wrong:** * **A & B (5% and 10% Dextrose):** These are hypotonic solutions once the glucose is metabolized. They rapidly leave the intravascular space and move into the intracellular compartment, causing cellular edema (including cerebral edema) without effectively expanding blood volume. * **C (Dextrose Normal Saline):** While it contains sodium, the addition of dextrose is unnecessary for acute volume resuscitation and can lead to osmotic diuresis or hyperglycemia, which may worsen neurological outcomes in trauma. **High-Yield Clinical Pearls for NEET-PG:** * **ATLS 10th Edition Update:** The initial fluid bolus has been reduced from 2L to **1L** to prevent "lethal triad" (acidosis, coagulopathy, hypothermia) and hemodilution. * **Hyperchloremic Acidosis:** Large volumes of Normal Saline (0.9% NaCl) can lead to hyperchloremic metabolic acidosis; Hartmann’s solution avoids this. * **Permissive Hypotension:** In non-compressible hemorrhage, the goal is to maintain a "just sufficient" BP (e.g., systolic 80-90 mmHg) until surgical control is achieved to prevent "popping the clot." * **Golden Hour:** The first 60 minutes post-injury where prompt resuscitation significantly improves survival.

Question 528: Which suture material is absorbed in approximately 180 days?

A. Polydioxanone (Correct Answer)
B. Catgut
C. Chromic Catgut
D. Nylon

Explanation: **Explanation:** The correct answer is **Polydioxanone (PDS)**. Suture materials are classified based on their absorption profile and origin. Polydioxanone is a synthetic, monocutaneous, absorbable polymer that provides prolonged tensile strength. **Why Polydioxanone is correct:** Polydioxanone is known for its slow absorption rate via **hydrolysis**. It maintains approximately 50% of its tensile strength at 4 weeks and is completely absorbed by the body in approximately **180 to 210 days**. This makes it ideal for tissues that heal slowly or require long-term support, such as the abdominal fascia (linea alba). **Why the other options are incorrect:** * **Catgut:** A natural absorbable suture (derived from bovine/ovine submucosa) that is absorbed rapidly via **proteolysis** within 7–10 days. * **Chromic Catgut:** Treated with chromic acid salts to delay absorption; it typically loses tensile strength in 10–14 days and is absorbed in about 90 days. * **Nylon:** A synthetic **non-absorbable** monofilament. While it may undergo very slow degradation over years, it is clinically classified as permanent. **High-Yield Clinical Pearls for NEET-PG:** * **Fastest absorption:** Catgut (7-10 days). * **Slowest absorption (Absorbable category):** Polydioxanone (180+ days). * **Mechanism of Absorption:** Natural sutures (Catgut) are absorbed by **proteolysis/enzymatic digestion** (causes more tissue reaction), while synthetic sutures (PDS, Vicryl) are absorbed by **hydrolysis** (less reaction). * **Vicryl (Polyglactin 910):** Absorbed in 60–90 days; a common "workhorse" suture in surgery.

Question 529: What is the management of a desmoid tumor?

A. Local excision
B. Wide excision (Correct Answer)
C. Radiotherapy
D. Growth inhibitors

Explanation: **Explanation:** A **Desmoid tumor** (also known as aggressive fibromatosis) is a benign but locally aggressive fibroblastic proliferation. While it does not metastasize, it is notorious for its high rate of local recurrence and infiltrative growth pattern. **Why Wide Excision is Correct:** The primary goal of management is achieving **negative margins (R0 resection)**. Because these tumors lack a true capsule and infiltrate surrounding tissues (muscles and fascia) like "tentacles," simple local excision often leaves microscopic disease behind. Therefore, **Wide Local Excision with a 1–2 cm margin** of healthy tissue is the gold standard to minimize the high risk of local recurrence. **Analysis of Incorrect Options:** * **A. Local Excision:** This refers to "shelling out" or marginal excision. Due to the infiltrative nature of desmoids, this leads to nearly universal recurrence. * **C. Radiotherapy:** This is generally reserved as an adjuvant treatment for recurrent cases or when surgery would result in significant functional morbidity. It is not the primary management. * **D. Growth Inhibitors:** Medical therapies (NSAIDs like Sulindac, Tamoxifen, or Imatinib) are used for unresectable, systemic, or intra-abdominal desmoids (often seen in FAP), but they are not the first-line treatment for resectable sporadic tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** Strongly associated with **Gardner Syndrome** (a variant of Familial Adenomatous Polyposis - FAP). * **Common Site:** Most common in the **infraumbilical rectus sheath** of young parous women (due to estrogen influence and trauma). * **Pathology:** Characterized by spindle cells and abundant collagen; they stain positive for **nuclear beta-catenin**. * **Management Note:** In modern practice, "Watchful Waiting" is increasingly considered for asymptomatic, non-progressive cases, but for active management, wide excision remains the definitive surgical answer.

Question 530: According to the 'rule of nines', what percentage of body surface area does each lower limb represent?

A. 9%
B. 18% (Correct Answer)
C. 27%
D. 36%

Explanation: The **Wallace Rule of Nines** is a standardized clinical tool used to estimate the Total Body Surface Area (TBSA) affected by burns in adults. This estimation is critical for calculating fluid resuscitation requirements (e.g., via the Parkland Formula). ### Why 18% is Correct In an adult, the body is divided into sections representing 9% or multiples of 9%: * **Each Lower Limb:** 18% (9% for the anterior surface and 9% for the posterior surface). * **Each Upper Limb:** 9% (4.5% anterior, 4.5% posterior). * **Anterior Trunk:** 18%. * **Posterior Trunk:** 18%. * **Head and Neck:** 9%. * **Perineum/Genitalia:** 1%. Since the question asks for the percentage of **each** lower limb, the correct value is **18%**. ### Analysis of Incorrect Options * **A (9%):** This represents a single upper limb or the head and neck. * **C (27%):** This does not correspond to a single anatomical unit in the Rule of Nines (though it would represent one leg plus one arm). * **D (36%):** This represents the **total** for both lower limbs combined or the entire trunk (anterior + posterior). ### High-Yield Clinical Pearls for NEET-PG 1. **Pediatric Variation:** The Rule of Nines is modified for children because their heads are proportionally larger. In an infant, the **head is 18%** and each **lower limb is 14%**. 2. **Lund and Browder Chart:** This is the most accurate method for TBSA estimation in children as it accounts for age-related changes in body proportions. 3. **Palmar Method:** For small or patchy burns, the patient’s entire palm (including fingers) represents approximately **1% TBSA**. 4. **Exclusion:** Remember that **first-degree burns** (erythema only) are **not** included in TBSA calculations for fluid resuscitation.

Practice by Chapter

Wound Healing and Care

Practice Questions

Surgical Infections

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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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