General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 691: All of the following are true regarding R5 strain of HIV except?

A. Utilizes CCR5 co-receptor
B. Predominates in late stages of HIV (Correct Answer)
C. Transmits HIV efficiently
D. Infects microglial cells

Explanation: ### Explanation The HIV-1 virus enters host cells by binding to the CD4 receptor and a specific co-receptor (chemokine receptor). Based on co-receptor usage, HIV strains are classified into **R5 (M-tropic)** and **X4 (T-tropic)**. **Why Option B is the Correct Answer (The False Statement):** R5 strains utilize the **CCR5** co-receptor and are the **predominant strains during the early stages** of infection (acute phase and asymptomatic period). They are responsible for the initial establishment of infection. In contrast, **X4 strains** (which use the CXCR4 co-receptor) typically emerge in the **late stages** of the disease, correlating with a rapid decline in CD4+ T-cell counts and progression to AIDS. **Analysis of Other Options:** * **Option A:** R5 strains specifically utilize the **CCR5** co-receptor, which is found on macrophages, dendritic cells, and memory T-cells. * **Option C:** R5 strains are the primary strains involved in **mucosal transmission**. They are more efficiently transmitted sexually compared to X4 strains, even if the donor has both types (the "gatekeeper" effect). * **Option D:** Microglial cells in the central nervous system express CD4 and CCR5; therefore, R5 strains are the primary neurotropic variants that infect these cells, potentially leading to HIV-associated neurocognitive disorders. ### High-Yield Pearls for NEET-PG: * **Maraviroc:** A CCR5 antagonist (entry inhibitor) that is only effective against R5-tropic HIV. A "Tropism Assay" must be performed before starting this drug. * **CCR5-Δ32 Mutation:** A 32-base pair deletion in the CCR5 gene. Individuals homozygous for this mutation are virtually resistant to R5-tropic HIV infection. * **Mnemonic:** **R5** = **M**acrophage-tropic (Early); **X4** = **T**-cell-tropic (Late).

Question 692: Transplantation of which one of the following organs is most often associated with hyper-acute rejection?

A. Heart
B. Kidney (Correct Answer)
C. Lungs
D. Liver

Explanation: **Explanation:** **Hyper-acute rejection (HAR)** is a type II hypersensitivity reaction mediated by pre-formed antibodies (anti-HLA or anti-ABO) in the recipient’s serum. These antibodies bind to the donor vascular endothelium immediately upon reperfusion, leading to complement activation, thrombosis, and graft necrosis. **Why Kidney is the Correct Answer:** The **Kidney** is the organ most frequently associated with hyper-acute rejection. This is because renal transplantation involves direct vascular anastomoses, and the renal vasculature is highly sensitive to antibody-mediated endothelial damage. To prevent this, a **mandatory pre-transplant cross-match** is performed to detect pre-existing antibodies. If HAR occurs, it happens within minutes to hours, and the kidney must be removed immediately. **Analysis of Incorrect Options:** * **Liver:** The liver is relatively "immunologically privileged." It can often tolerate ABO-incompatible transplants better than other organs because it can absorb/filter out pre-formed antibodies and has a dual blood supply. * **Heart & Lungs:** While HAR can occur in these organs, it is clinically rarer than in kidneys because prospective cross-matching is strictly enforced, and the density of target antigens/vascular susceptibility is lower compared to the renal capillary bed. **Clinical Pearls for NEET-PG:** * **Mechanism:** Pre-formed antibodies → Complement activation → Fibrinoid necrosis and thrombosis. * **Timeframe:** Minutes to hours (on the operating table). * **Prevention:** Mandatory **CDC (Complement Dependent Cytotoxicity) Cross-match**. * **Pathology:** Grossly, the organ becomes cyanotic, mottled, and flaccid. * **Treatment:** No medical treatment; immediate surgical removal of the graft is required.

Question 693: Which of the following is NOT an indication for surgery in bronchiectasis?

A. Refractory foul-smelling copious sputum
B. Hemoptysis
C. Bilateral disease (Correct Answer)
D. Bleeding

Explanation: **Explanation:** In the management of bronchiectasis, surgery is considered a **second-line treatment** reserved for specific complications or localized disease that fails medical management. **Why "Bilateral Disease" is the correct answer:** Surgery for bronchiectasis (typically lobectomy or segmentectomy) is most successful when the disease is **localized** to a single lobe or segment. **Bilateral, diffuse, or generalized disease** is generally a **contraindication** to surgery because removing affected tissue on both sides would severely compromise the patient’s pulmonary reserve without curative intent. In such cases, medical management or lung transplantation are the preferred options. **Analysis of Incorrect Options:** * **Refractory foul-smelling copious sputum (A):** Persistent, malodorous, and voluminous sputum that does not respond to intensive antibiotics and chest physiotherapy is a classic indication for resecting the diseased segment to improve the patient's quality of life. * **Hemoptysis (B) & Bleeding (D):** These are essentially the same clinical indication. Massive or recurrent hemoptysis (often due to erosion into bronchial arteries) is a life-threatening emergency. If bronchial artery embolization (BAE) fails or if the bleeding is localized and recurrent, surgical resection is indicated. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** High-Resolution CT (HRCT) scan showing "Signet ring sign" (bronchial diameter > accompanying artery). * **Pre-requisite for Surgery:** Before operating, a **Bronchography** or CT must confirm that the disease is localized and **Pulmonary Function Tests (PFTs)** must ensure adequate postoperative reserve. * **Most common lobe involved:** Left Lower Lobe (due to the anatomy of the left main bronchus). * **Kartagener Syndrome:** A high-yield triad associated with bronchiectasis: Situs inversus, chronic sinusitis, and bronchiectasis.

Question 694: Tillaux's sign is seen in which of the following conditions?

A. Abdominal tuberculosis
B. Peritonitis
C. Mesenteric cyst (Correct Answer)
D. Misty mesentery

Explanation: **Explanation:** **Tillaux’s Sign** is a classic clinical sign used to identify a **Mesenteric Cyst**. It is characterized by a palpable abdominal mass that is mobile in a direction perpendicular to the line of the mesenteric attachment (typically from the left upper quadrant to the right iliac fossa) but has restricted mobility along the axis of the attachment. Additionally, there is a zone of resonance (tympanitic sound) surrounding the mass on percussion, which distinguishes it from other intra-abdominal masses. **Why the other options are incorrect:** * **Abdominal Tuberculosis:** Typically presents with a "doughy" abdomen, ascites, or fixed matted bowel loops. While it can cause mesenteric lymphadenopathy, it does not classically exhibit Tillaux’s sign. * **Peritonitis:** This is an acute inflammatory condition characterized by guarding, rigidity, and rebound tenderness (Blumberg sign), rather than a discrete mobile mass. * **Misty Mesentery:** This is a radiological finding (CT scan) showing increased attenuation of mesenteric fat, often associated with mesenteric panniculitis or lymphoma, but it is not a clinical sign. **High-Yield Clinical Pearls for NEET-PG:** * **Mesenteric Cysts:** Most commonly occur in the ileum. They are often asymptomatic but can present with the "Chylous pseudocyst" triad: abdominal pain, mass, and distension. * **Differential Diagnosis:** Must be distinguished from an **Ovarian Cyst** (which is mobile in all directions) and a **Hydatid Cyst** (which moves with respiration if attached to the liver). * **Treatment:** The gold standard treatment is **enucleation** of the cyst. If the blood supply to the adjacent bowel is compromised, formal bowel resection and anastomosis are required.

Question 695: TPN is indicated in all except?

A. Short bowel syndrome
B. Burns
C. Sepsis (Correct Answer)
D. Enterocutaneous Fistula

Explanation: Total Parenteral Nutrition (TPN) is the intravenous administration of all necessary nutrients, bypassing the gastrointestinal (GI) tract. The fundamental rule in clinical nutrition is: **"If the gut works, use it."** ### **Explanation of the Correct Answer** **C. Sepsis:** In the acute phase of severe sepsis or septic shock, the body is in a state of extreme metabolic stress and hemodynamic instability. Initiating TPN during this hypermetabolic "ebb phase" is contraindicated because it can exacerbate metabolic derangements (like hyperglycemia), increase the risk of secondary infections (catheter-related bloodstream infections), and does not improve outcomes until the patient is stabilized. Enteral nutrition is preferred if possible; otherwise, TPN is delayed until the patient is hemodynamically stable. ### **Analysis of Incorrect Options** * **A. Short Bowel Syndrome:** This is a classic indication for TPN. Due to massive bowel resection, there is insufficient mucosal surface area to absorb nutrients, making long-term TPN essential for survival. * **B. Burns:** Severe burns cause a massive hypermetabolic state. While enteral nutrition is preferred, TPN is indicated if the patient has a paralytic ileus or if enteral intake cannot meet the massive caloric requirements (often >3000-5000 kcal/day). * **D. Enterocutaneous Fistula:** High-output fistulas (>500ml/day) require "bowel rest" to reduce secretions and allow the fistula to close. TPN provides necessary nutrition while bypassing the GI tract. ### **High-Yield Clinical Pearls for NEET-PG** * **Most common complication of TPN:** Catheter-related sepsis (usually *Staph. epidermidis* or *Staph. aureus*). * **Most common metabolic complication:** Hyperglycemia. * **Most common liver complication:** Steatosis (fatty liver) and cholestasis. * **Refeeding Syndrome:** Characterized by **Hypophosphatemia** (most important), Hypokalemia, and Hypomagnesemia when starting nutrition in malnourished patients. * **Absolute Contraindication:** Functional GI tract, hemodynamic instability, or when the prognosis does not warrant aggressive support.

Question 696: Hernia into the pouch of Douglas is classified as which type of hernia?

A. Beclard's hernia
B. Bochdalek's hernia
C. Blandin's hernia
D. Richter's hernia (Correct Answer)

Explanation: **Explanation:** The correct answer is **Richter’s hernia**. This type of hernia occurs when only a portion of the circumference of the bowel wall (usually the antimesenteric border) becomes incarcerated within a hernial sac. While commonly associated with femoral or inguinal rings, it can occur at any site, including the **Pouch of Douglas** (the rectouterine/rectovesical pouch). **Clinical Significance:** Because the entire lumen is not obstructed, patients may present with strangulation and gangrene without signs of intestinal obstruction, often leading to a dangerous delay in diagnosis. ### **Analysis of Incorrect Options:** * **A. Beclard’s Hernia:** This is a rare variant of a femoral hernia where the protrusion occurs through the opening for the **great saphenous vein** (saphenous opening). * **B. Bochdalek’s Hernia:** A type of congenital **diaphragmatic hernia** occurring through the pleuroperitoneal canal, typically located posterolaterally (usually on the left side). * **C. Blandin’s Hernia:** Also known as an **internal vaginal hernia**, this refers to a hernia into the broad ligament of the uterus. ### **NEET-PG High-Yield Pearls:** * **Littre’s Hernia:** Hernia containing a Meckel’s diverticulum. * **Maydl’s Hernia:** "W-shaped" hernia where two loops of bowel are in the sac, but the intervening loop inside the abdomen is the one that becomes strangulated. * **Amyand’s Hernia:** Inguinal hernia containing the appendix. * **De Garengeot Hernia:** Femoral hernia containing the appendix. * **Richter’s Hernia Key Sign:** "Spurious diarrhea" may occur because the intestinal lumen remains patent despite localized strangulation.

Question 697: What is the concentration of sodium in Ringer's Lactate (RL) solution?

A. 154 mEq/L
B. 120 mEq/L
C. 130 mEq/L (Correct Answer)
D. 144 mEq/L

Explanation: **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.

Question 698: A hernia sac contains only a portion of the circumference of the intestine. What is this type of hernia called?

A. Richter's hernia (Correct Answer)
B. Littre's hernia
C. Spigelian hernia
D. Lumbar hernia

Explanation: ### Explanation **1. Why Richter’s Hernia is Correct:** A **Richter’s hernia** occurs when only a **portion of the circumference** of the bowel wall (usually the antimesenteric border) becomes trapped within a hernia sac. Because the entire lumen is not compromised, the patient may not present with classic signs of intestinal obstruction (like vomiting or absolute constipation), which often leads to a **dangerous delay in diagnosis**. However, the trapped portion can rapidly undergo strangulation and gangrene, leading to perforation. It is most commonly seen in femoral and obturator hernias. **2. Why the Other Options are Incorrect:** * **Littre’s hernia:** This refers to a hernia sac that contains a **Meckel’s diverticulum**. It is a common "distractor" in exams; remember: *Richter = Wall, Littre = Meckel’s.* * **Spigelian hernia:** This is an acquired ventral hernia occurring through the **linea semilunaris** (at the level of the arcuate line). It is an anatomical location, not a description of the sac contents. * **Lumbar hernia:** These occur through defects in the posterior abdominal wall. Examples include **Grynfeltt-Lesshaft** (superior triangle) and **Petit’s** (inferior triangle) hernias. **3. NEET-PG High-Yield Pearls:** * **Maydl’s Hernia:** A "W-shaped" hernia where two loops of bowel are in the sac, but the intervening loop inside the abdomen is the one that becomes gangrenous. * **Amyand’s Hernia:** The hernia sac contains the **Appendix** (usually within an inguinal hernia). * **De Garengeot Hernia:** The appendix is trapped within a **femoral** hernia sac. * **Clinical Warning:** In Richter’s hernia, local signs of strangulation (redness, pain) may appear before systemic signs of obstruction. Always maintain a high index of suspicion.

Question 699: What is false regarding wandering spleen?

A. Chronic torsion leads to splenomegaly
B. Treatment of choice is splenectomy only (Correct Answer)
C. Infarction and torsion are common
D. It is encapsulated with a long vascular pedicle

Explanation: **Explanation:** **Wandering Spleen** (Splenoptosis) is a rare clinical condition characterized by the migration of the spleen from its normal anatomical position in the left upper quadrant to other parts of the abdomen or pelvis. This occurs due to the **congenital or acquired absence or laxity of the suspensory ligaments** (gastrosplenic and splenorenal ligaments). **Why Option B is False:** The treatment of choice is **not** splenectomy only. In modern surgical practice, **Splenopexy** (surgical fixation of the spleen) is the preferred treatment, especially in children and young adults, to preserve splenic function and avoid the risk of Overwhelming Post-Splenectomy Infection (OPSI). Splenectomy is reserved only for cases where there is **total splenic infarction** or severe thrombosis of the pedicle. **Analysis of Other Options:** * **Option A:** Chronic or intermittent torsion leads to venous congestion, which results in progressive **splenomegaly**. * **Option C:** Because the spleen is attached only by a **long, mobile vascular pedicle**, it is highly prone to twisting (torsion), which can lead to hemorrhagic infarction and acute abdomen. * **Option D:** The spleen remains encapsulated but possesses an abnormally long vascular pedicle (containing the splenic artery and vein), allowing it to "wander." **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** An asymptomatic mobile abdominal mass or acute abdomen due to torsion. * **Diagnostic Modality:** **Contrast-Enhanced CT (CECT)** is the gold standard (shows the absence of the spleen in its fossa and the "whirl sign" of a twisted pedicle). * **Association:** More common in multiparous women (due to ligamentous laxity) and children under 10 years.

Question 700: Ochsner-Sherren regimen is used for:

A. Appendicular abscess
B. Pelvic abscess
C. Appendicular mass (Correct Answer)
D. Acute appendicitis

Explanation: ### Explanation **Correct Answer: C. Appendicular mass** The **Ochsner-Sherren regimen** is the traditional conservative management strategy for an **appendicular mass**. An appendicular mass forms when the inflamed appendix is walled off by the greater omentum and loops of small bowel. In this state, immediate surgery is technically difficult and carries a high risk of injury to the friable, inflamed bowel (risk of fecal fistula). The regimen follows the principle of **"masterly inactivity,"** allowing the inflammatory process to resolve naturally. It involves: * Strict bed rest and NPO (nothing by mouth) status. * Intravenous fluids and broad-spectrum antibiotics. * Careful monitoring of vital signs and serial charting of the mass size. **Why other options are incorrect:** * **Appendicular abscess (A):** Unlike a solid mass, an abscess (collection of pus) requires **drainage** (usually ultrasound-guided percutaneous drainage) rather than just conservative observation. * **Pelvic abscess (B):** This is typically managed via transrectal or transvaginal drainage. * **Acute appendicitis (D):** The standard of care for uncomplicated acute appendicitis is an **emergency appendectomy** (laparoscopic or open) to prevent perforation. **High-Yield Clinical Pearls for NEET-PG:** * **Success Rate:** The Ochsner-Sherren regimen is successful in about 90% of cases. * **Indications to Abandon:** If the pulse rate rises, pain increases, or the mass size enlarges, the regimen is abandoned in favor of emergency surgery. * **Interval Appendectomy:** Traditionally, an appendectomy was performed 6–8 weeks after the mass resolved. However, current guidelines suggest this is only necessary if symptoms recur or in patients >40 years to rule out malignancy (e.g., cecal carcinoma or carcinoid). * **Contraindication:** Conservative management is generally avoided in children and the elderly due to the high risk of rapid progression and perforation.

Practice by Chapter

Wound Healing and Care

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Surgical Infections

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Fluid and Electrolyte Management

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Nutrition in Surgical Patients

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Hemostasis and Blood Transfusion

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Surgical Instruments and Equipment

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Sutures and Stapling Devices

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Minimal Access Surgery Principles

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Surgical Complications

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Anesthesia Principles for Surgeons

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Surgical Oncology Principles

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Evidence-Based Surgery

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