General Surgery Principles Practice Questions

Q: The response to shock includes which of the following metabolic effects?

Hyperkalemia. **Explanation:** The metabolic response to shock is a complex physiological attempt to maintain homeostasis and preserve vital organ perfusion. **Why Hyperkalemia is Correct:** During shock (particularly hypovolemic or cardiogenic), tissue hypoxia leads to a shift from aerobic to **anaerobic metabolism**, resulting in lactic acidosis. To buffer the excess hydrogen ions ($H^+$), the body moves them into the cells in exchange for potassium ($K^+$) moving out into the extracellular fluid. Furthermore, decreased renal perfusion leads to a drop in the glomerular filtration rate (GFR), impairing the kidneys' ability to excrete potassium. Cell death and membrane instability also contribute to the release of intracellular potassium, leading to **hyperkalemia**. **Why the other options are incorrect:** * **A & B: Increase in sodium/water excretion and renal perfusion:** In shock, the body activates the Renin-Angiotensin-Aldosterone System (RAAS) and releases ADH (Vasopressin). This causes **sodium and water retention** and vasoconstriction to maintain blood pressure. Renal perfusion actually **decreases** as blood is shunted toward the heart and brain. * **C: Decrease in cortisol levels:** Shock is a major physiological stressor. The hypothalamic-pituitary-adrenal axis is activated, leading to an **increase in cortisol** and catecholamines to mobilize glucose and maintain vascular tone. **NEET-PG High-Yield Pearls:** * **Hyperglycemia** is common in early shock due to increased glycogenolysis and gluconeogenesis (driven by cortisol and adrenaline). * **Metabolic Acidosis** with an elevated anion gap (due to lactate) is the hallmark of the metabolic response. * **Negative Nitrogen Balance:** Shock induces a catabolic state, leading to protein breakdown and increased urinary nitrogen excretion.

Q: What is true about a dermoid cyst?

Rupture is associated with foreign body type inflammation. A **dermoid cyst** is a sequestration-type cyst formed when ectoderm is trapped along the lines of embryonic fusion. ### **Explanation of Options** * **Correct Answer (D):** Dermoid cysts contain adnexal structures like sebaceous glands, which produce **sebum and keratin**. If the cyst wall ruptures, these contents leak into the surrounding tissues, triggering a robust **foreign body giant cell reaction** and granulomatous inflammation. * **A is Incorrect:** Dermoid cysts are lined by **stratified squamous epithelium** (skin), not columnar epithelium. * **B is Incorrect:** Because they are lined by true skin, they frequently contain skin appendages such as **hair follicles**, sweat glands, and sebaceous glands. * **C is Incorrect:** The most common site for an external angular dermoid is the **lateral (outer) angle of the eye**, not the median (inner) angle. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Pathology:** It is a "sequestration dermoid." Unlike sebaceous cysts, dermoid cysts are **congenital** and are **not** attached to the overlying skin (no punctum). 2. **Common Sites:** * **External Angular Dermoid:** Most common site (lateral eyebrow). * **Sublingual Dermoid:** Located in the midline of the floor of the mouth (above or below the mylohyoid). 3. **Radiology:** In the skull, they often cause a "punched-out" lucency due to pressure erosion of the bone. 4. **Differentiating Feature:** Always perform a clinical check for **fixity to underlying bone** and cough impulse (to rule out intracranial extension/meningocele).

Q: Which of the following management strategies is NOT required for a patient with diabetes and an HbA1c of 11%?

Antiseptic agent dressings. **Explanation:** The patient presents with uncontrolled diabetes (HbA1c 11%), which significantly impairs wound healing and increases the risk of diabetic foot ulcers. The management of such ulcers follows the **Wound Bed Preparation (TIME)** principle and focuses on addressing the underlying pathophysiology. **Why Option C is the Correct Answer:** Modern wound care guidelines discourage the routine use of **antiseptic agent dressings** (like povidone-iodine, hydrogen peroxide, or EUSOL) for chronic diabetic ulcers. These agents are **cytotoxic** to fibroblasts and keratinocytes, which are essential for granulation tissue formation and re-epithelialization. While they kill bacteria, they also delay wound healing. Instead, saline-soaked dressings or advanced moisture-retentive dressings are preferred. **Analysis of Incorrect Options:** * **A. Off-loading:** This is the **gold standard** and most critical step in managing neuropathic ulcers. It redistributes pressure away from the wound to allow healing. * **B. Debridement:** Necessary to remove necrotic tissue and bacterial biofilm, which act as barriers to healing and a nidus for infection. * **D. Antibiotics:** Given the high HbA1c (11%), the patient is severely immunocompromised and at high risk for limb-threatening infections (cellulitis or osteomyelitis). Systemic antibiotics are indicated if clinical signs of infection are present. **NEET-PG High-Yield Pearls:** * **HbA1c Goal:** For elective surgery, the target is usually <7%. An HbA1c of 11% indicates a high risk of postoperative complications. * **Off-loading Gold Standard:** Total Contact Casting (TCC). * **Wagner’s Classification:** Used to grade diabetic foot ulcers (Grade 0 to 5). * **Rule of Thumb:** "If it's wet, dry it; if it's dry, wet it." Avoid harsh antiseptics on healthy granulation tissue.

Q: Chromic catgut suture has the added advantage of being:

Delayed resorption. **Explanation:** **Chromic catgut** is a natural, absorbable, multifilament suture derived from the submucosa of sheep intestine or the serosa of bovine intestine. The "plain" version of catgut is absorbed rapidly by enzymatic digestion (proteolysis). 1. **Why Option A is correct:** To improve its handling and longevity, the suture is treated with **chromium salts** (chromicization). This process creates cross-links between collagen fibers, making the suture more resistant to enzymatic breakdown. This results in **delayed resorption**, extending the tensile strength of the suture from about 7–10 days (plain) to approximately **14–21 days** (chromic). 2. **Why Options B and C are wrong:** * **No resorption (B):** Catgut is inherently organic and will always be absorbed; non-absorbable sutures like Silk or Prolene fit this description. * **Early resorption (C):** This describes Plain Catgut, which loses strength very quickly and is unsuitable for tissues under tension. 3. **Why Option D is wrong:** Chromic catgut actually has a smoother surface than plain catgut, reducing tissue drag rather than increasing adherence. **High-Yield NEET-PG Pearls:** * **Mechanism of Absorption:** Catgut is absorbed by **proteolysis/enzymatic digestion** (unlike synthetic sutures like Vicryl, which are absorbed by **hydrolysis**). * **Tissue Reaction:** It causes a significant inflammatory response because it is a foreign protein. * **Contraindication:** Never use catgut in infected tissues or for vascular anastomoses. * **Sterilization:** It is sterilized by **Gamma radiation** (it cannot be autoclaved as it is a protein).

Q: Following trauma, which hormone is NOT released?

Thyroxine. **Explanation:** The metabolic response to trauma and surgery is characterized by a "neuroendocrine stress response" aimed at mobilizing energy substrates and maintaining hemodynamic stability. **Why Thyroxine (A) is the correct answer:** During acute trauma or critical illness, the body often enters a state known as **Euthyroid Sick Syndrome** (Non-Thyroidal Illness Syndrome). In this state, there is a decrease in the peripheral conversion of T4 to the active T3, and levels of **Thyroxine (T4) typically remain normal or decrease** in severe cases. Unlike stress hormones, thyroxine does not play an acute role in the immediate metabolic response to injury; therefore, it is not "released" or elevated as a result of trauma. **Why the other options are incorrect:** * **Glucagon (B):** Trauma triggers a catabolic state. Glucagon levels rise significantly to promote glycogenolysis and gluconeogenesis, leading to "stress hyperglycemia." * **ADH (C):** Also known as Vasopressin, ADH is released in response to pain, stress, and potential hypovolemia (blood loss) to conserve water and maintain blood pressure. * **GH (D):** Growth Hormone levels rise acutely after trauma. While GH is normally anabolic, in the context of stress, it contributes to insulin resistance and the mobilization of free fatty acids. **NEET-PG High-Yield Pearls:** * **Hormones that INCREASE in trauma:** Catecholamines (first to rise), Cortisol, Glucagon, GH, ADH, Prolactin, and Renin-Angiotensin-Aldosterone. * **Hormones that DECREASE in trauma:** Insulin (or relative resistance), Testosterone, and T3 (due to decreased peripheral conversion). * **Key Concept:** The primary goal of the stress response is to provide glucose to the brain and heart at the expense of peripheral tissues.

Q: Which of the following is NOT a zone of operation theatre?

Septic zone. In hospital design and infection control, the Operating Theatre (OT) complex is divided into distinct zones based on the degree of cleanliness and the restriction of movement. This "zoning" system ensures a unidirectional flow of personnel and materials to minimize the risk of surgical site infections (SSI). **Explanation of the Correct Answer:** **A. Septic zone:** There is no such functional zone within a standard OT complex. While "septic cases" (infected surgeries) are performed, they are ideally conducted in a dedicated "Emergency" or "Septic OT" located separately, or as the last case in a regular OT followed by deep cleaning. The term "Septic zone" is not part of the formal four-zone classification of an OT. **Explanation of Incorrect Options:** * **C. Protective zone (Outer Zone):** This is the outermost area (e.g., reception, changing rooms). It acts as a buffer between the general hospital corridors and the OT. * **B. Clean zone (Intermediate Zone):** This area connects the protective zone to the sterile zone. It includes recovery rooms, pre-operative rooms, and storage for clean equipment. Staff must be in OT scrubs here. * **D. Sterile zone (Inner Zone):** This is the most restricted area, comprising the actual Operation Room (OR) and the scrub station. Only authorized personnel in full sterile attire are permitted. **High-Yield Clinical Pearls for NEET-PG:** * **The Four Zones:** 1. Protective (Unrestricted), 2. Clean (Semi-restricted), 3. Sterile (Restricted), and 4. Disposal (where waste exits without re-entering the sterile area). * **Airflow:** The OT maintains **positive pressure** relative to the corridors to prevent contaminated air from entering. * **Air Changes:** A minimum of **20 air changes per hour** is recommended, with at least 4 being fresh air. * **HEPA Filters:** These are used to filter particles up to **0.3 microns** with 99.97% efficiency.

Q: Which of the following does not predispose to abdominal wall dehiscence?

Old age. **Explanation:** Abdominal wall dehiscence (burst abdomen) is a serious postoperative complication where the fascial layers fail to remain apposed. The correct answer is **Old age** because, while elderly patients may have slower healing, age alone is not a primary independent risk factor for dehiscence compared to the other options. **Why Old Age is the Correct Answer:** Clinical studies indicate that age is not a significant predisposing factor for wound dehiscence if the patient’s nutritional status and comorbidities are controlled. In contrast, younger patients with high physical activity or specific risk factors can also experience dehiscence. **Analysis of Incorrect Options:** * **Faulty Technique:** This is the **most common cause** of dehiscence. Examples include placing sutures too close to the edge (less than 1 cm), using inappropriate suture material (too thin or rapidly absorbable), or tying knots too tightly (causing tissue necrosis). * **Malignancy:** Cancer induces a state of hypoproteinemia, anemia, and immunosuppression. It impairs collagen synthesis and fibroblast activity, significantly weakening the primary healing process. * **Raised Intra-abdominal Pressure:** Conditions like postoperative coughing (COPD), vomiting, ileus, or ascites put mechanical strain on the suture line, leading to "cutting through" of the sutures. **NEET-PG High-Yield Pearls:** * **Timing:** Dehiscence typically occurs between the **5th and 8th postoperative day**. * **The "Pink Discharge" Sign:** The earliest clinical sign is a serosanguinous (pink) discharge from the wound. * **Management:** Immediate management involves covering the bowel with sterile saline-soaked gauze, followed by urgent surgical re-closure (usually using tension-band or mass closure techniques). * **The 4:1 Rule:** For a secure closure, the length of the suture used should be at least four times the length of the incision.

Q: What are the causes of persistence of a sinus or fistula?

All of the above. The persistence of a sinus (a blind track lined by granulation tissue) or a fistula (an abnormal communication between two epithelial surfaces) is a common clinical scenario in surgery. For a sinus or fistula to heal, the underlying inflammatory process must resolve and the track must be able to collapse and epithelialise. **Explanation of the Correct Answer:** The correct answer is **All of the above** because these factors interfere with the natural healing process: * **Foreign Body (Option A):** This is the most common cause. A foreign body (e.g., a non-absorbable suture, a piece of glass, or a sequestrum in osteomyelitis) acts as a nidus for chronic infection, preventing the granulation tissue from closing the track. * **Non-dependent Drainage (Option B):** If the opening of the sinus is at a higher level than the base, gravity causes pus and debris to accumulate at the bottom. This persistent reservoir of infection prevents the track from drying up and healing. * **Unrelieved Obstruction (Option C):** In the case of a fistula, if there is a distal obstruction (e.g., a stricture or tumor distal to an enterocutaneous fistula), the high intraluminal pressure forces contents through the fistula track, keeping it patent. **Clinical Pearls for NEET-PG:** To remember the causes of a persistent fistula, use the mnemonic **FRIEND**: * **F:** Foreign body * **R:** Radiation (causes endarteritis and poor blood supply) * **I:** Infection (specifically Tuberculosis or Actinomycosis) / Inflammatory Bowel Disease (Crohn’s) * **E:** Epithelialization of the track (prevents closure) * **N:** Neoplasia (malignancy at the base) * **D:** Distal obstruction **High-Yield Fact:** A sinus or fistula that fails to heal despite adequate drainage should always be biopsied to rule out malignancy (e.g., Marjolin’s ulcer in a chronic long-standing sinus).

Q: What is the raw material used in nylon suture?

Polyamide polymer. ### Explanation **Correct Answer: B. Polyamide polymer** **Why it is correct:** Nylon is a synthetic, non-absorbable monofilament (or braided) suture made from the **polyamide** family of polymers. Chemically, it is a long-chain carbon polymer containing recurring amide groups. It is highly favored in surgery for its high tensile strength and smooth surface, which minimizes tissue trauma. However, it is known for its "memory," making knot security more challenging compared to silk. **Why the other options are incorrect:** * **A. Polyethylene terephthalate:** This is the chemical name for **Dacron** (e.g., Ethibond). It is a polyester suture, not nylon. * **C. Polybutylene terephthalate:** This is the raw material for **Novafil**, which is a monofilament polybutester suture known for its high elasticity. * **D. Polyester polymer:** This is a broad category that includes sutures like Mersilene and Ethibond. While nylon and polyester are both synthetic non-absorbable sutures, they belong to different chemical classes (Polyamide vs. Polyester). **High-Yield Clinical Pearls for NEET-PG:** * **Degradation:** Although classified as non-absorbable, nylon undergoes slow **hydrolysis** in vivo, losing approximately 15–20% of its tensile strength per year. * **Best Use:** Nylon is the "Gold Standard" for **skin closure** due to its low tissue reactivity and aesthetic results. * **Memory:** Nylon has high "plasticity" and "memory," meaning it tends to return to its original straight shape. Therefore, more throws (usually 5–6) are required for a secure knot. * **Comparison:** Unlike **Prolene (Polypropylene)**, which is inert and preferred for vascular anastomoses, Nylon is slightly more reactive but easier to handle in skin suturing.

Q: A Gridiron incision is extended by which maneuver to become a Rutherford Morison's incision?

Cutting the muscles laterally. **Explanation:** The **Gridiron (McBurney’s) incision** is a muscle-splitting incision used primarily for appendectomies. It involves splitting the fibers of the external oblique, internal oblique, and transversus abdominis muscles without cutting them. When more exposure is required (e.g., for a retrocecal appendix or a difficult ureteric surgery), the Gridiron incision can be converted into a **Rutherford Morison’s incision**. This is achieved by **cutting the internal oblique and transversus abdominis muscles laterally** in the line of the incision. This extension provides a wider field of view and better access to the retroperitoneal structures. **Analysis of Options:** * **Option A (Splitting laterally):** This is the standard technique for a Gridiron incision. Simply splitting further does not provide the specific exposure characteristic of the Rutherford Morison extension. * **Option C (Cutting medially):** Cutting medially into the rectus sheath converts a Gridiron incision into a **Fowler-Weir incision**. * **Option D (Incising vertically):** Vertical extensions are generally avoided in these muscle-splitting approaches as they cross Langer’s lines and weaken the abdominal wall, potentially leading to incisional hernias. **High-Yield Clinical Pearls for NEET-PG:** * **Lanz Incision:** A transverse skin crease incision used for appendectomy; it provides a better cosmetic result than the Gridiron. * **Battle’s Incision:** A vertical paramedian incision (rarely used now due to risk of nerve damage). * **Rutherford Morison’s Use:** Apart from difficult appendectomies, it is commonly used for access to the **iliac vessels** and **extraperitoneal approach to the ureter**.

Question 1

The response to shock includes which of the following metabolic effects?

Accepted Answer

Hyperkalemia

Answer

Increase in sodium and water excretion

Answer

Increase in renal perfusion

Answer

Decrease in cortisol levels

Question 2

What is true about a dermoid cyst?

Accepted Answer

Rupture is associated with foreign body type inflammation

Answer

Lined by columnar epithelium

Answer

Does not contain hair

Answer

The median angle of the eye is the most common site

Question 3

Which of the following management strategies is NOT required for a patient with diabetes and an HbA1c of 11%?

Accepted Answer

Antiseptic agent dressings

Answer

Off-loading

Answer

Debridement

Answer

Antibiotics

Question 4

Chromic catgut suture has the added advantage of being:

Accepted Answer

Delayed resorption

Answer

No resorption

Answer

Early resorption

Answer

Greater adherence

Question 5

Following trauma, which hormone is NOT released?

Accepted Answer

Thyroxine

Answer

Glucagon

Answer

ADH

Answer

GH

Question 6

Which of the following is NOT a zone of operation theatre?

Accepted Answer

Septic zone

Answer

Clean zone

Answer

Protective zone

Answer

Sterile zone

Question 7

Which of the following does not predispose to abdominal wall dehiscence?

Accepted Answer

Old age

Answer

Faulty technique

Answer

Malignancy

Answer

Raised intra-abdominal pressure

Question 8

What are the causes of persistence of a sinus or fistula?

Accepted Answer

All of the above

Answer

Foreign body

Answer

Non-dependent drainage

Answer

Unrelieved obstruction

Question 9

What is the raw material used in nylon suture?

Accepted Answer

Polyamide polymer

Answer

Polyethylene terephthalate

Answer

Polybutylene terephthalate

Answer

Polyester polymer

Question 10

A Gridiron incision is extended by which maneuver to become a Rutherford Morison's incision?

Accepted Answer

Cutting the muscles laterally

Answer

Splitting the muscles laterally

Answer

Cutting the muscles medially into the rectus sheath

Answer

Incising vertically along the rectus muscle

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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