General Surgery Principles Practice Questions

Q: What is the concentration of sodium in Ringer's Lactate (RL) solution?

130 mEq/L. **Explanation:** Ringer's Lactate (RL), also known as Hartmann's solution, is a balanced crystalloid solution designed to mimic the electrolyte composition of human plasma. It is considered more physiological than Normal Saline (0.9% NaCl) because it contains lower concentrations of sodium and chloride, preventing hyperchloremic metabolic acidosis. **Why 130 mEq/L is correct:** The sodium concentration in RL is specifically formulated to be **130 mEq/L**. This is slightly hyponatremic compared to plasma (135–145 mEq/L), which is why RL is generally avoided in patients with head injuries (to prevent cerebral edema). **Analysis of Incorrect Options:** * **154 mEq/L (Option A):** This is the sodium concentration of **Normal Saline (0.9% NaCl)**. It is isotonic but contains supra-physiological levels of chloride (154 mEq/L). * **120 mEq/L (Option B):** This value does not correspond to standard resuscitation fluids; it is significantly lower than physiological requirements. * **144 mEq/L (Option C):** This is the sodium concentration found in **Plasmalyte**, another balanced crystalloid that more closely matches human plasma sodium levels. **High-Yield Clinical Pearls for NEET-PG:** * **Composition of RL:** Na⁺ (130), Cl⁻ (109), K⁺ (4), Ca²⁺ (3), and Lactate (28) mEq/L. * **The Lactate Factor:** Lactate is metabolized by the **liver** into bicarbonate; therefore, RL is contraindicated in severe liver failure and lactic acidosis. * **Drug Incompatibility:** RL contains **Calcium**, so it should not be administered in the same line as blood transfusions (citrate in blood binds with calcium, causing clots) or certain drugs like Ceftriaxone. * **Fluid of Choice:** RL is the preferred fluid for **burns (Parkland Formula)** and most surgical resuscitations.

Q: Which surgical blade is typically used for suture removal?

Suture removal. The correct answer is **Suture removal**, specifically referring to the **No. 12 blade**. ### Educational Explanation **1. Why the correct answer is right:** The **No. 12 blade** is a small, pointed, crescent-shaped blade sharpened along the inside edge of the curve. This unique "hooked" design allows the surgeon to slide the blade underneath a suture thread easily. Once positioned, the upward pulling motion cuts the suture from the inside out, minimizing skin trauma and preventing the sharp tip from accidentally pricking the patient. **2. Why the other options are incorrect:** * **Minor surgical procedures:** While many blades are used in minor surgery, the **No. 15 blade** is the gold standard. It has a small, curved cutting edge ideal for making short, precise incisions in delicate areas (e.g., hand or plastic surgery). * **Abscess drainage:** The **No. 11 blade** is preferred here. It is an elongated, triangular blade with a sharp point, perfect for "stab incisions" required to puncture and drain an abscess or for laparoscopic port insertions. * **Abdominal incision:** Large incisions (laparotomy) require the **No. 10 blade**. It has a large, curved cutting edge (the "belly") used for making long, deep incisions through skin and subcutaneous fat. ### High-Yield Clinical Pearls for NEET-PG: * **Blade Handles:** Blades #10, #11, #12, and #15 fit on the **No. 3 handle**. Larger blades like #20-#24 fit on the **No. 4 handle**. * **No. 11 Blade:** Also used for Arteriotomy and I&D (Incision and Drainage). * **No. 15 Blade:** Most common blade used for skin biopsies and fine surgical work. * **Safety Tip:** Always use a needle holder (not fingers) to attach or remove blades from the handle to prevent needle-stick injuries.

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.

Question 1

A 50-year-old known asthmatic develops sudden onset right-sided chest pain with dyspnea. Chest X-ray reveals hyperlucency on the right side with a shift of the trachea to the left side. What is the best treatment for immediate relief of symptoms?

Accepted Answer

Water seal intercostal drainage on the right side of the chest

Answer

Intravenous morphine

Answer

Nebulization of beta 2 agonist, e.g., salbutamol

Answer

Intravenous aminophylline

Question 2

What is the concentration of sodium in Ringer's Lactate (RL) solution?

Accepted Answer

130 mEq/L

Answer

154 mEq/L

Answer

120 mEq/L

Answer

144 mEq/L

Question 3

Which surgical blade is typically used for suture removal?

Accepted Answer

Suture removal

Answer

Minor surgical procedures

Answer

Abscess drainage

Answer

Abdominal incision

Question 4

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 5

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 6

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 7

Chromic catgut suture has the added advantage of being:

Accepted Answer

Delayed resorption

Answer

No resorption

Answer

Early resorption

Answer

Greater adherence

Question 8

Following trauma, which hormone is NOT released?

Accepted Answer

Thyroxine

Answer

Glucagon

Answer

ADH

Answer

GH

Question 9

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 10

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

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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