General Surgery Principles Practice Questions

Q: Which of the following is not a contributing factor in thoracic outlet syndrome?

Tumor arising from the middle lobe of lung. ### Explanation **Thoracic Outlet Syndrome (TOS)** is a clinical condition resulting from the compression of the neurovascular bundle (brachial plexus, subclavian artery, or subclavian vein) as it passes through the superior thoracic aperture. **Why Option A is correct:** A tumor arising from the **middle lobe of the lung** does not cause TOS because the middle lobe is located inferiorly and anteriorly in the chest. In contrast, a **Pancoast tumor** (superior sulcus tumor) arising from the **apex** of the lung is a well-known cause of TOS, as it directly invades the brachial plexus and the thoracic outlet. **Why the other options are incorrect:** * **Malunion of fracture clavicle (B):** The clavicle forms the anterior boundary of the thoracic outlet. A malunion with excessive callus formation can narrow the costoclavicular space, compressing the underlying neurovascular structures. * **Cervico-thoracic scoliosis (C):** Significant spinal curvature alters the musculoskeletal anatomy of the neck and upper thorax, leading to a narrowing of the interscalene triangle or costoclavicular space. * **Anomalies of the first thoracic rib (D):** Structural abnormalities such as a rudimentary first rib, a bifid rib, or an exostosis directly reduce the space available for the neurovascular bundle. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** A **Cervical Rib** (present in ~0.5% of the population) is the classic anatomical cause. * **Most common type:** **Neurogenic TOS** (95%) involving the lower trunk of the brachial plexus (C8-T1), leading to Gilliatt-Sumner hand (wasting of thenar/hypothenar muscles). * **Clinical Test:** **Adson’s Test** (loss of radial pulse on rotating the head to the affected side during deep inspiration) suggests compression. * **Paget-Schroetter Syndrome:** Effort-induced thrombosis of the subclavian vein, a form of Venous TOS.

Q: In a head injury patient, Mannitol should not be used for the control of increased intracranial pressure when:

Serum osmolality is more than 320 mOsmol/kg. **Explanation:** Mannitol is an osmotic diuretic used to reduce intracranial pressure (ICP) by creating an osmotic gradient that draws water from the brain parenchyma into the intravascular space. **Why Option A is Correct:** The efficacy of Mannitol depends on the osmotic gradient between the blood and the brain. If the **serum osmolality exceeds 320 mOsmol/kg**, the gradient is lost, and Mannitol no longer effectively shifts fluid. Furthermore, at levels above 320 mOsmol/kg, there is a significantly increased risk of **acute tubular necrosis (ATN)** and renal failure. Therefore, serum osmolality must be monitored closely, and Mannitol should be withheld if this threshold is crossed. **Why the other options are incorrect:** * **Option B (PaCO2 100 mm Hg):** Maintaining adequate oxygenation is vital in head injuries to prevent secondary brain insult. High PaO2 is not a contraindication for osmotic therapy. * **Option D (pH < 7.35):** While acidosis can cause vasodilation and increase ICP, it does not preclude the use of Mannitol. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Mannitol has two phases—an initial **rheological effect** (decreases blood viscosity, increasing cerebral blood flow) followed by the **osmotic effect** (occurs after 15–30 mins). * **Contraindications:** Congestive heart failure (due to initial volume expansion), pulmonary edema, and anuria. * **Alternative:** Hypertonic saline (3%) is increasingly preferred over Mannitol in patients with hypotension or borderline renal function.

Q: Which substrate is depleted earliest in the postoperative period?

Glucose. **Explanation:** The metabolic response to surgery and trauma is characterized by an immediate "ebb phase" followed by a "flow phase." During this period, the body prioritizes maintaining blood glucose levels for vital organ function. **Why Glucose is the Correct Answer:** Glucose is the primary and most immediate fuel source for the brain and erythrocytes. In the immediate postoperative period, circulating **glucose** is the first substrate to be utilized and depleted. To compensate for this rapid depletion, the body initiates glycogenolysis (breakdown of glycogen) and gluconeogenesis (formation of glucose from non-carbohydrate sources) to maintain homeostasis. **Analysis of Incorrect Options:** * **Glycogen (Option C):** While glycogen stores are limited, they typically last for **12 to 24 hours** during fasting or stress. Glucose is consumed even before these stores are fully exhausted. * **Amino Acids (Options A & B):** Branched-chain (leucine, isoleucine, valine) and non-branched-chain amino acids are mobilized during the flow phase of injury via skeletal muscle proteolysis. These serve as precursors for gluconeogenesis but are not the "earliest" substrates depleted; they are mobilized as a secondary response to sustain glucose levels once initial stores fall. **NEET-PG High-Yield Pearls:** * **Sequence of Energy Utilization:** Free Glucose → Glycogen (exhausted in <24 hours) → Proteins (Muscle) → Fats (Adipose). * **The "Ebb Phase":** Occurs in the first 24 hours; characterized by decreased metabolic rate, decreased body temperature, and increased blood glucose (due to insulin resistance). * **Gluconeogenesis:** In the postoperative period, the main substrates for gluconeogenesis are **lactate, alanine, and glycerol**. * **Nitrogen Balance:** Surgery induces a **negative nitrogen balance** due to the breakdown of muscle protein to provide amino acids for repair and energy.

Q: What is true regarding a ranula?

It is a cystic swelling in the floor of the mouth.. A **ranula** is a clinical term for a translucent, bluish, cystic swelling found in the **floor of the mouth**. It typically arises from the **sublingual salivary gland** due to trauma or obstruction of the ducts (Ducts of Rivinus). ### Why Option B is Correct: The term "ranula" is derived from the Latin word *rana* (frog), as the swelling resembles the translucent underbelly of a frog. It is classically located lateral to the midline in the floor of the mouth, superior to the mylohyoid muscle. ### Why Other Options are Incorrect: * **Option A:** An **epulis** is a non-specific clinical term for any tumor-like swelling or lump on the **gingiva** (gums), not the floor of the mouth. * **Option C:** A **thyroglossal cyst** is a midline neck swelling that moves with protrusion of the tongue and deglutition; it is an embryological remnant of the thyroglossal duct. * **Option D:** While some ranulas are retention cysts, the majority (especially large ones) are **extravasation pseudocysts**. They lack an epithelial lining and are formed by mucus leaking into the surrounding submucosal tissues. Therefore, calling it a "mucus retention cyst" is technically inaccurate in most clinical cases. ### High-Yield Clinical Pearls for NEET-PG: * **Plunging Ranula:** Occurs when mucus extravasates through or around the **mylohyoid muscle**, presenting as a swelling in the submandibular region (neck). * **Management:** The treatment of choice is **Marsupialization** for simple ranulas, though the definitive treatment to prevent recurrence is the **excision of the sublingual gland**. * **Appearance:** It is typically painless, fluctuant, and transilluminant.

Q: An Alvarado score of 2 defines which of the following clinical findings?

Leukocytosis. The **Alvarado Score** (MANTRELS) is a clinical scoring system used to diagnose acute appendicitis. It consists of 8 components with a total possible score of 10. ### **Explanation of the Correct Answer** In the Alvarado scoring system, most parameters are assigned **1 point**, but two specific findings are weighted more heavily because of their high predictive value. These are assigned **2 points** each: 1. **Tenderness in the Right Iliac Fossa (R)** 2. **Leukocytosis (L)** (White blood cell count > 10,000/mm³) Therefore, **Leukocytosis** is the correct answer as it defines a score of 2. ### **Analysis of Incorrect Options** * **A. Temperature:** Elevated temperature (Fever > 37.3°C or 99.1°F) is assigned **1 point**. * **C. Tenderness in left iliac fossa:** This is not a component of the Alvarado score. The score specifically looks for **Right** iliac fossa tenderness. * **D. Migratory pain:** Migration of pain to the right iliac fossa is assigned **1 point**. ### **Clinical Pearls for NEET-PG (MANTRELS Mnemonic)** To remember the scoring, use the mnemonic **MANTRELS**: * **M**igration of pain (1) * **A**norexia (1) * **N**ausea/Vomiting (1) * **T**enderness in RIF (**2**) * **R**ebound tenderness (1) * **E**levated temperature (1) * **L**eukocytosis (**2**) * **S**hift to the left of neutrophils (1) **Interpretation:** * **Score 1–4:** Appendicitis unlikely. * **Score 5–6:** Possible appendicitis (Observation/Imaging recommended). * **Score 7–8:** Probable appendicitis. * **Score 9–10:** Definite appendicitis (Surgical intervention usually indicated).

Q: Which of the following can precipitate ulcers in diabetic patients?

Macroangiopathy. **Explanation:** The development of diabetic foot ulcers is multifactorial, but **Macroangiopathy** (Option D) is a primary precipitating factor. In diabetes, macrovascular disease involves accelerated atherosclerosis of large and medium-sized arteries (e.g., femoral, popliteal, and tibial arteries). This leads to **ischemia**, which reduces oxygen and nutrient delivery to tissues, making them highly susceptible to breakdown and significantly impairing the healing process once an injury occurs. **Analysis of Options:** * **Macroangiopathy (Correct):** It causes large-vessel ischemia. Ischemic ulcers are often painful, occur at the periphery (toes), and are a direct precipitant of tissue necrosis. * **Neuropathy (Incorrect):** While neuropathy (sensory, motor, and autonomic) is a major *predisposing* factor that leads to loss of protective sensation and foot deformities, the question asks for a factor that precipitates the vascular compromise leading to ulceration. In many clinical contexts, ischemia (macroangiopathy) is the critical "tipping point" for non-healing ulcers. * **Microangiopathic changes (Incorrect):** While basement membrane thickening occurs in small vessels, it is generally considered less significant than macrovascular disease in the actual precipitation of large, clinical foot ulcers. * **Trophic ulcers (Incorrect):** This is a *type* of ulcer (often resulting from neuropathy), not a cause or precipitating factor itself. **NEET-PG High-Yield Pearls:** * **The Diabetic Triad:** Neuropathy, Ischemia (Macroangiopathy), and Infection. * **Most common site:** The head of the first metatarsal (due to pressure). * **Wagner’s Classification:** Used to grade diabetic foot ulcers (Grade 0: Pre-ulcerative; Grade 5: Extensive gangrene). * **Monckeberg’s Sclerosis:** Medial calcific sclerosis common in diabetics; it can lead to falsely elevated Ankle-Brachial Index (ABI) readings.

Q: What is the ideal angle for a Z-plasty?

60 degrees. **Explanation:** Z-plasty is a versatile transposition flap technique used in plastic surgery to increase the length of a scar, change its direction, or release a contracture. **Why 60 degrees is the Correct Answer:** The gain in length in a Z-plasty is directly proportional to the angle of the flaps. A **60-degree angle** is considered the "ideal" or "standard" angle because it provides a significant and predictable **75% increase in length** while maintaining adequate blood supply to the flap tips. It offers the best balance between maximum lengthening and flap viability. **Analysis of Incorrect Options:** * **30 degrees (Option A):** While smaller angles are easier to transpose, they provide a minimal length increase (only about 25%). They are rarely used because the gain is insufficient for most clinical contractures. * **45 degrees (Option B):** This provides a moderate length increase (approx. 50%). It is used when skin tension is too high for a 60-degree flap, but it is not the "ideal" standard. * **90 degrees (Option D):** Theoretically, larger angles provide more length (a 90-degree angle would yield a 120% increase). However, they are clinically impractical because the flaps become too difficult to transpose and the resulting tension often leads to tip necrosis or wound dehiscence. **High-Yield Clinical Pearls for NEET-PG:** * **Mathematical Principle:** Z-plasty consists of one central limb and two parallel side limbs of equal length. * **Length Gain Rule:** 30° = 25% gain; 45° = 50% gain; **60° = 75% gain**. * **Primary Indication:** Linear scar contractures (e.g., post-burn contractures crossing a joint line). * **Key Complication:** Flap tip necrosis (usually due to excessive tension or narrow angles).

Question 1

Rubber band extraction is indicated in a haemophiliac patient as it facilitates the extraction by:

Accepted Answer

Necrosis of the periodontal ligament (PDL)

Answer

Traction force on the periodontal ligament (PDL)

Answer

Necrosis of the alveolar bone

Answer

Pulling of the periodontal ligament (PDL)

Question 2

What is the most commonly used flap in head and neck surgery?

Accepted Answer

Pectoralis major flap

Answer

Deltopectoral flap

Answer

Latissimus dorsi flap

Answer

Temporalis flap

Question 3

Which of the following is not a contributing factor in thoracic outlet syndrome?

Accepted Answer

Tumor arising from the middle lobe of lung

Answer

Malunion of fracture clavicle

Answer

Cervico-thoracic scoliosis

Answer

Anomalies of the first thoracic rib

Question 4

In a head injury patient, Mannitol should not be used for the control of increased intracranial pressure when:

Accepted Answer

Serum osmolality is more than 320 mOsmol/kg

Answer

PaCO2 is less than 34 mm Hg

Answer

PaO2 is more than 100 mm Hg

Answer

pH is less than 7.35

Question 5

Which substrate is depleted earliest in the postoperative period?

Accepted Answer

Glucose

Answer

Branched-chain amino acids

Answer

Non-branched-chain amino acids

Answer

Glycogen

Question 6

Lung sequestration occurs most commonly in which lobe?

Accepted Answer

Left posterior basal

Answer

Apical

Answer

Left posterosuperior

Answer

Right lateral basal

Question 7

What is true regarding a ranula?

Accepted Answer

It is a cystic swelling in the floor of the mouth.

Answer

It is also called an epulis.

Answer

It is a type of thyroglossal cyst.

Answer

It is a type of mucus retention cyst.

Question 8

An Alvarado score of 2 defines which of the following clinical findings?

Accepted Answer

Leukocytosis

Answer

Temperature

Answer

Tenderness in left iliac fossa

Answer

Migratory pain

Question 9

Which of the following can precipitate ulcers in diabetic patients?

Accepted Answer

Macroangiopathy

Answer

Trophic ulcers

Answer

Neuropathy

Answer

Microangiopathic changes in blood vessels

Question 10

What is the ideal angle for a Z-plasty?

Accepted Answer

60 degrees

Answer

30 degrees

Answer

45 degrees

Answer

90 degrees

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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