General Surgery Principles Practice Questions

Q: A child undergoing CECT chest develops immediate swelling at the contrast injection site, progressing gradually. The child also reports numbness and pain on passive finger extension, and examination reveals a feeble radial pulse. What is the most appropriate next step?

Immediate fasciotomy. ### Explanation The clinical presentation describes a severe case of **Contrast Extravasation** leading to **Acute Compartment Syndrome**. **1. Why "Immediate Fasciotomy" is Correct:** The key clinical markers here are **pain on passive extension**, **numbness** (paresthesia), and a **feeble radial pulse**. These are the "Ps" of compartment syndrome. When contrast is injected under pressure (especially via power injectors in CECT), a large volume can enter the tight fascial compartments of the limb. This increases intracompartmental pressure, compromising capillary perfusion and leading to tissue ischemia. If neurovascular compromise is evident (feeble pulse, sensory loss), it is a surgical emergency requiring **immediate fasciotomy** to decompress the compartment and prevent permanent necrosis or Volkmann’s Ischemic Contracture. **2. Why Other Options are Incorrect:** * **A. High dose prednisolone and antihistamines:** These are used for *anaphylactoid* (hypersensitivity) reactions. They do not address the mechanical pressure/ischemia caused by extravasation. * **B. Angiography:** This would cause further delay and potentially involve more contrast injection, worsening the pressure. Diagnosis of compartment syndrome is primarily clinical. * **D. Surgical exploration:** While related, "exploration" is too vague. The specific life-and-limb-saving procedure required for compartment syndrome is a fasciotomy. **3. Clinical Pearls for NEET-PG:** * **Risk Factors:** Use of power injectors, small/fragile veins (infants/elderly), and unconscious patients who cannot report pain. * **Initial Management:** For *mild* extravasation, elevate the limb and apply cold compresses. * **The "6 Ps" of Compartment Syndrome:** Pain (out of proportion), Pallor, Paresthesia, Pulselessness, Paralysis, and Poikilothermia. * **Gold Standard Diagnosis:** Clinical exam; however, a compartment pressure **>30 mmHg** is diagnostic.

Q: What is the ideal treatment of alveolar osteitis after dental extraction?

Debridement of socket and sedative dressing. **Explanation:** **Alveolar Osteitis**, commonly known as **"Dry Socket,"** is a painful condition occurring 3–5 days post-extraction due to the premature lysis or loss of the blood clot. This exposes the underlying alveolar bone to oral fluids and bacteria, leading to localized osteitis. **Why Option C is Correct:** The primary goal of treatment is **pain management** and promoting secondary intention healing. The standard protocol involves: 1. **Gentle Debridement:** Irrigating the socket with warm saline to remove food debris and necrotic tissue. 2. **Sedative Dressing:** Placing a medicated dressing (typically **Zinc Oxide Eugenol** or Alvogyl) into the socket. Eugenol acts as a local anesthetic and obtundent, providing immediate relief from the characteristic radiating pain. **Why Other Options are Incorrect:** * **A & B (Antibiotics):** Dry socket is primarily a physical loss of the clot leading to inflammation, not a systemic or localized infection requiring antibiotics. They do not provide pain relief or accelerate healing in this context. * **D (Curettage):** This is **contraindicated**. Aggressive curettage to induce bleeding can spread the localized inflammation into the deeper bone, potentially causing true osteomyelitis. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (most common), oral contraceptives, traumatic extraction, and mandibular third molar extractions. * **Clinical Feature:** Severe, throbbing pain radiating to the ear, accompanied by a foul odor (halitosis) and an empty-looking socket. * **Pathophysiology:** Increased **fibrinolysis** (plasminogen conversion to plasmin) which dissolves the clot. * **Management:** It is a self-limiting condition; treatment is purely symptomatic.

Q: What is considered the best type of dressing for a surgical wound?

Skin. **Explanation:** The primary goal of a surgical dressing is to provide a sterile environment, absorb exudate, and facilitate healing. While various synthetic materials exist, **Skin** is considered the "best" or "ideal" biological dressing. **1. Why Skin is the Correct Answer:** Intact skin is the most physiological dressing available. In the context of surgery, particularly in burns or large reconstructive procedures, **autologous skin** (autograft) is the gold standard. It provides an absolute barrier against infection, prevents fluid and electrolyte loss, reduces pain, and promotes definitive wound closure. No synthetic material can perfectly replicate the complex immunological and mechanical properties of human skin. **2. Analysis of Incorrect Options:** * **Opsite (Option A):** This is a transparent, adhesive polyurethane film. While excellent for providing a moist environment and allowing wound visualization, it is a synthetic dressing and cannot match the biological integration of skin. * **Amnion (Option B):** Amniotic membrane is a biological dressing often used in burns. While it reduces pain and promotes epithelialization, it is usually a temporary biological cover (allograft) and is inferior to the patient's own skin. * **Tulle Gras (Option C):** This is a paraffin-impregnated gauze. It is a traditional non-adherent dressing used to prevent the dressing from sticking to the wound, but it lacks the protective and regenerative properties of skin. **Clinical Pearls for NEET-PG:** * **Ideal Dressing Properties:** Non-toxic, non-adherent, permeable to water vapor but impermeable to bacteria. * **Biological Dressings:** Include skin (autograft/allograft), amnion, and collagen. They are superior to synthetic dressings for large raw areas. * **High-Yield Fact:** For a clean surgical wound closed by primary intention, the dressing is typically removed after **48 hours**, as the epithelium seals the wound by then.

Q: A patient is scheduled for a right hemicolectomy due to carcinoma of the cecum, and a midline laparotomy is planned. As the assistant, you are responsible for cleaning, painting, and draping the surgical site. Which anatomical area will you prepare for this operation?

Nipple to mid-thigh, including the genitalia. ### Explanation In surgical practice, the area of skin preparation (cleaning and painting) must be significantly larger than the planned incision. This ensures that if the incision needs to be extended or if a drain needs to be placed, the surgical field remains sterile. **1. Why Option A is Correct:** For a **midline laparotomy** (the standard approach for a right hemicolectomy), the surgical field must cover the entire abdomen. * **Superior limit:** The **nipple line** (T4 level) is prepared to allow for potential cephalad extension of the incision into the epigastrium or even a sternotomy/thoracotomy in emergencies. * **Inferior limit:** The **mid-thigh and genitalia** are included because the incision may extend to the pubic symphysis. Cleaning the groin and genitalia is essential as these areas have high bacterial colonization; failing to prep them increases the risk of surgical site infection (SSI) if the drapes shift or the incision is low. **2. Analysis of Incorrect Options:** * **Option B & D:** Starting at the **epigastrium** is insufficient. If the surgeon needs to visualize the upper liver or diaphragm during the hemicolectomy, the superior margin would be contaminated. * **Option C:** Preparing from the **chin** is excessive and reserved for procedures involving the neck, thyroid, or upper esophagus. **3. Clinical Pearls for NEET-PG:** * **The "Rule of Prep":** Always prep one joint above and one joint below the operative site (for limbs) or the entire anatomical compartment (for trunk). * **Antiseptic Choice:** Chlorhexidine-alcohol is generally superior to Povidone-iodine for preventing SSIs, provided there are no contraindications (e.g., use near the eyes or ears). * **Hair Removal:** If necessary, hair should be removed using **electric clippers** immediately before surgery. Razors are contraindicated as they cause micro-abrasions that increase infection risk.

Q: Compression osteosynthesis heals fracture mandible by which mechanism?

Primary union without callus formation. **Explanation:** The core concept behind **Compression Osteosynthesis** (achieved via compression plates and screws) is the provision of **absolute stability**. When a fracture is rigidly fixed and the bone ends are compressed together, the interfragmentary strain is reduced to near zero. 1. **Why Option A is correct:** Under conditions of absolute stability, **Primary (Direct) Bone Healing** occurs. This mechanism involves "contact healing" or "gap healing" where Haversian remodeling occurs directly across the fracture site via **cutting cones** (osteoclasts followed by osteoblasts). Because there is no movement between fragments, there is no stimulus for the formation of a periosteal bridge; thus, it heals **without callus formation**. 2. **Why Option B is incorrect:** Secondary union is the natural process of bone healing characterized by the formation of a **callus**. It occurs under conditions of relative stability (e.g., casts, intramedullary nails, or external fixators). It is impossible to have secondary union without a callus. 3. **Why Option C is incorrect:** "Compression union" is a descriptive term for the state of the bone but is not a recognized physiological mechanism of histological bone healing. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Healing:** Requires absolute stability + compression. No callus. (Example: Compression plating). * **Secondary Healing:** Requires relative stability + micromotion. Callus formation present. (Example: Gunning splints, MMM, or IM nails). * **Mandible Specifics:** The goal of rigid internal fixation (RIF) in the mandible is early mobilization and restoration of occlusion. * **Champy’s Technique:** Uses non-compression miniplates placed along the "ideal lines of osteosynthesis" to neutralize tension forces.

Q: What is the most common site for pressure sores?

Ischium. **Explanation:** Pressure sores (decubitus ulcers) occur due to prolonged ischemia caused by external pressure exceeding capillary perfusion pressure (approximately 32 mmHg). The distribution of these ulcers depends heavily on the patient's position. **Why Ischium is correct:** The **ischial tuberosity** is the most common site for pressure sores overall. This is because the highest pressure intensities in the body are recorded over the ischium while in the **sitting position**. Since many patients at risk (such as those with paraplegia) spend significant time in wheelchairs, the ischium remains the most frequent site of involvement. **Analysis of Incorrect Options:** * **Sacrum:** This is the most common site for patients in the **supine (lying down) position**. While very frequent in hospital-bed-bound patients, statistically, the ischium leads in overall prevalence across all patient populations (including chronic wheelchair users). * **Greater Trochanter:** This is the most common site for patients in the **lateral decubitus (side-lying) position**. * **Heel:** This is a common site in supine patients, particularly those with peripheral vascular disease or diabetes, but it ranks lower in frequency than the sacrum or ischium. **High-Yield Clinical Pearls for NEET-PG:** * **Order of Frequency:** Ischium (24%) > Sacrum (23%) > Greater Trochanter (15%) > Heel (8%). * **Grading:** Pressure sores are classified into 4 stages (Stage I: Non-blanchable erythema; Stage IV: Full-thickness loss with exposed bone/tendon/muscle). * **Management:** The gold standard for prevention is frequent repositioning (every 2 hours). For surgical closure, **myocutaneous flaps** are preferred over skin grafts due to better padding and blood supply.

Q: Interparietal hernia at the level of the arcuate line and lateral border of the rectus is called?

Spigelian hernia. ### Explanation **Correct Answer: A. Spigelian hernia** A **Spigelian hernia** is a type of interparietal hernia that occurs through the **Spigelian fascia** (the aponeurosis of the transversus abdominis muscle). * **Anatomy:** It is bounded laterally by the **linea semilunaris** (lateral border of the rectus muscle) and medially by the rectus sheath. * **Location:** The vast majority occur at or below the **arcuate line** (Spigelian hernia belt), where the posterior rectus sheath is absent, creating a point of potential weakness. * **Mechanism:** It is "interparietal" because the hernial sac often dissects between the internal oblique and external oblique aponeurosis, making it difficult to diagnose on physical examination as there is often no obvious external bulge. **Analysis of Incorrect Options:** * **B. Lumbar hernia:** Occurs through the posterior abdominal wall in either the superior (Grynfelt-Lesshaft) or inferior (Petit) lumbar triangles. * **C. Richter’s hernia:** A specific type of hernia where only a **portion of the circumference** of the bowel wall is trapped. It does not refer to a specific anatomical location like the Spigelian fascia. * **D. Epigastric hernia:** Occurs through the **linea alba** in the midline, anywhere between the xiphoid process and the umbilicus. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Clinical diagnosis is difficult; **Ultrasound or CT scan** is the gold standard for confirmation. * **Risk of Strangulation:** High, due to the narrow, rigid neck of the defect. * **Treatment:** Surgical repair is always indicated (open or laparoscopic) because of the high risk of incarceration. * **Key Landmark:** The intersection of the arcuate line and the linea semilunaris is the most common site.

Q: Pseudoeschar formation is seen with which of the following agents?

Silver sulfadiazine. **Explanation:** **Silver sulfadiazine (SSD)** is the most commonly used topical antibacterial agent in burn care. Its hallmark clinical feature is the formation of a **pseudoeschar**—a thick, grayish-white, gelatinous layer formed by the interaction of the cream with wound exudate. Unlike a true eschar (dead tissue), a pseudoeschar can be easily debrided or washed away during dressing changes. **Analysis of Options:** * **Silver sulfadiazine (B):** Correct. It is painless, has broad-spectrum activity (including *Pseudomonas*), but its main drawback is the formation of pseudoeschar which can sometimes harbor bacteria if not cleaned properly. * **Silver Nitrate (A):** This agent does not form a pseudoeschar. Instead, it causes **black staining** of the skin and dressings. Its major clinical side effects are electrolyte imbalances (hyponatremia, hypochloremia) due to leaching. * **Mafenide acetate / Sulfamylon (C & D):** These are the same agent. Mafenide is highly effective for deep penetration (especially in ear burns/cartilage), but it is notorious for causing **metabolic acidosis** (via carbonic anhydrase inhibition) and pain on application. It does not form a pseudoeschar. **High-Yield Clinical Pearls for NEET-PG:** * **Silver Sulfadiazine:** Can cause transient **leukopenia** (neutropenia) within 2-3 days of therapy; it is contraindicated in patients with sulfa allergies and in newborns (risk of kernicterus). * **Mafenide Acetate:** The drug of choice for **burns over cartilage** and heavily colonized wounds due to its superior tissue penetration. * **Silver Nitrate (0.5%):** Known for causing "blackening" and potential methemoglobinemia.

Q: Keloid formation is least likely seen over which of the following areas?

Eyelid. **Explanation:** Keloids are benign overgrowths of dense fibrous tissue (collagen) that extend beyond the boundaries of the original wound. Their formation is highly dependent on **skin tension** and the density of skin appendages. **Why Eyelid is the correct answer:** The **eyelid** (along with the scrotum and palms/soles) is characterized by very thin skin with minimal tension and a lack of pilosebaceous units. These anatomical factors make it highly resistant to keloid formation. In clinical practice, keloids are almost never seen on the eyelids, making it the "least likely" site among the options. **Analysis of Incorrect Options:** * **Presternal region:** This is the **most common** site for keloids due to high constant skin tension from the pectoralis muscles and chest wall movement. * **Deltoid/Shoulder:** A very common site, often triggered by vaccinations (like BCG) or trauma, due to high tension during arm movement. * **Ear:** A frequent site for keloids, typically occurring on the lobule following ear piercing. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Keloids extend **beyond** the margin of the original wound and do not regress spontaneously (unlike hypertrophic scars). * **Common Sites (High to Low):** Presternal > Shoulder/Deltoid > Upper back > Ear lobule. * **Rare Sites:** Eyelids, Scrotum, Palms, and Soles. * **Histology:** Characterized by thick, disorganized, "glassy" **Type I and Type III collagen** bundles. * **Treatment:** Intralesional Triamcinolone (steroids) is the first-line medical treatment. Excision alone has a high recurrence rate (>50%).

Question 1

A child undergoing CECT chest develops immediate swelling at the contrast injection site, progressing gradually. The child also reports numbness and pain on passive finger extension, and examination reveals a feeble radial pulse. What is the most appropriate next step?

Accepted Answer

Immediate fasciotomy

Answer

High dose prednisolone and antihistamines

Answer

Angiography

Answer

Surgical exploration

Question 2

What is the ideal treatment of alveolar osteitis after dental extraction?

Accepted Answer

Debridement of socket and sedative dressing

Answer

Topical antibiotics

Answer

Systemic antibiotics

Answer

Curettage to induce fresh bleeding

Question 3

What is considered the best type of dressing for a surgical wound?

Accepted Answer

Skin

Answer

Opsite

Answer

Amnion

Answer

Tulle grass

Question 4

A patient is scheduled for a right hemicolectomy due to carcinoma of the cecum, and a midline laparotomy is planned. As the assistant, you are responsible for cleaning, painting, and draping the surgical site. Which anatomical area will you prepare for this operation?

Accepted Answer

Nipple to mid-thigh, including the genitalia

Answer

Epigastrium to the pubic symphysis

Answer

Chin to the pubic symphysis

Answer

Epigastrium to mid-thigh, including the genitalia

Question 5

Splenectomy predisposes to which type of infection?

Accepted Answer

Encapsulated bacterial infections

Answer

Amoebic infections

Answer

Bacteroides infections

Answer

Viral infections

Question 6

Compression osteosynthesis heals fracture mandible by which mechanism?

Accepted Answer

Primary union without callus formation

Answer

Secondary union without callus formation

Answer

Compression union

Answer

All of the above

Question 7

What is the most common site for pressure sores?

Accepted Answer

Ischium

Answer

Greater trochanter

Answer

Sacrum

Answer

Heel

Question 8

Interparietal hernia at the level of the arcuate line and lateral border of the rectus is called?

Accepted Answer

Spigelian hernia

Answer

Lumbar hernia

Answer

Richter’s hernia

Answer

Epigastric hernia

Question 9

Pseudoeschar formation is seen with which of the following agents?

Accepted Answer

Silver sulfadiazine

Answer

Silver Nitrate

Answer

Sulfamylon

Answer

Mafenide acetate

Question 10

Keloid formation is least likely seen over which of the following areas?

Accepted Answer

Eyelid

Answer

Ear

Answer

Deltoid

Answer

Presternal region

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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