General Surgery Principles Practice Questions

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

Nylon. **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.

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

Epilepsy. **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.

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

Wedge principle.. 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.

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

Superficial parotidectomy. **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.

Q: Cullen's sign is seen in:

Acute pancreatitis. **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%).

Q: Which suture material is absorbed in approximately 180 days?

Polydioxanone. **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.

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

18%. 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.

Question 1

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

Accepted Answer

Nylon

Answer

Catgut

Answer

Fascialata

Answer

Polyglycolic acid

Question 2

Corpus callosotomy is useful in the treatment of which condition?

Accepted Answer

Epilepsy

Answer

Stroke

Answer

Alzheimer's disease

Answer

None of the above

Question 3

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

Accepted Answer

Wedge principle.

Answer

Lever principle.

Answer

Wheel and axle principle.

Answer

None of the above.

Question 4

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

Accepted Answer

Superficial parotidectomy

Answer

Enucleation

Answer

Radiotherapy

Answer

Observation

Question 5

Cullen's sign is seen in:

Accepted Answer

Acute pancreatitis

Answer

Acute cholecystitis

Answer

Acute hepatitis

Answer

Blunt injury abdomen

Question 6

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

Accepted Answer

Occurs because of conservative management of deep burns.

Answer

Treated by flaps.

Answer

Causes obliteration of the cervicomental angle.

Answer

Never develops in deep dermal burns.

Question 7

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

Accepted Answer

Hamann's solution

Answer

5% dextrose

Answer

10% dextrose

Answer

Dextrose normal saline

Question 8

Which suture material is absorbed in approximately 180 days?

Accepted Answer

Polydioxanone

Answer

Catgut

Answer

Chromic Catgut

Answer

Nylon

Question 9

What is the management of a desmoid tumor?

Accepted Answer

Wide excision

Answer

Local excision

Answer

Radiotherapy

Answer

Growth inhibitors

Question 10

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

Accepted Answer

18%

Answer

9%

Answer

27%

Answer

36%

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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