General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 161: What is true about femoral hernia?

A. Commoner in males
B. Least likely to strangulate
C. Richter's hernia is its variant (Correct Answer)
D. Litter's hernia is its type

Explanation: **Explanation:** **Femoral hernia** occurs through the femoral canal, medial to the femoral vein. It is a high-yield topic for NEET-PG due to its unique anatomical and clinical profile. **Why Option C is Correct:** A **Richter’s hernia** occurs when only a portion of the bowel wall (the antimesenteric border) is trapped within the hernial sac. Because the entire lumen is not occluded, patients may not present with classic signs of intestinal obstruction, leading to a dangerous delay in diagnosis. Richter’s hernia is a well-known variant of femoral hernias due to the narrow, rigid boundaries of the femoral ring. **Why Other Options are Incorrect:** * **Option A:** While inguinal hernias are the most common hernia in both sexes, **femoral hernias are significantly more common in females** (F:M ratio approx. 3:1) due to the wider female pelvis and larger femoral canal. * **Option B:** Femoral hernias have the **highest risk of strangulation** (approx. 20–40%) among all abdominal wall hernias because the femoral ring is narrow and has rigid borders (Lacunar ligament). * **Option C:** **Littre’s hernia** is defined as a hernia sac containing a **Meckel’s diverticulum**. While it can occur in the femoral canal, it is a specific anatomical entity rather than a "type" of femoral hernia. **Clinical Pearls for NEET-PG:** * **Position:** A femoral hernia is felt **below and lateral** to the pubic tubercle (Inguinal hernia is above and medial). * **Management:** Because of the high risk of strangulation, all femoral hernias should be repaired surgically (e.g., McVay’s repair, Lotheissen’s trans-inguinal approach, or McEvedy’s high approach). * **De Garengeot Hernia:** A rare variant where the **appendix** is found within a femoral hernia sac.

Question 162: A 70 kg man presents with pyloric stenosis resulting from peptic ulcer disease and is admitted for resuscitation after one week of prolonged vomiting. What is the most likely associated metabolic disturbance?

A. Hypokalemic hyperchloremic metabolic acidosis
B. Hypokalemic hypochloremic metabolic acidosis
C. Hypokalemic hyperchloremic metabolic alkalosis
D. Hypokalemic hypochloremic metabolic alkalosis (Correct Answer)

Explanation: **Explanation** The metabolic hallmark of gastric outlet obstruction (pyloric stenosis) is **Hypokalemic Hypochloremic Metabolic Alkalosis**. **Pathophysiology:** 1. **Loss of HCl:** Prolonged vomiting leads to a massive loss of gastric juice, which is rich in Hydrogen ($H^+$) and Chloride ($Cl^-$) ions. The loss of $H^+$ directly causes **metabolic alkalosis**, while the loss of $Cl^-$ leads to **hypochloremia**. 2. **Renal Compensation & Hypokalemia:** To compensate for the alkalosis, the kidney initially excretes bicarbonate ($HCO_3^-$) with Sodium ($Na^+$). However, the resulting dehydration triggers aldosterone secretion. Aldosterone acts on the distal tubule to conserve $Na^+$ at the expense of $K^+$ and $H^+$. This leads to significant **hypokalemia**. 3. **Paradoxical Aciduria:** In severe stages, as $K^+$ stores are depleted, the kidney is forced to exchange $Na^+$ for $H^+$ ions to maintain volume. This results in acidic urine despite systemic alkalosis—a high-yield phenomenon known as **paradoxical aciduria**. **Analysis of Incorrect Options:** * **Options A & B (Acidosis):** Vomiting causes a loss of acid ($H^+$), not a gain. Therefore, acidosis is physiologically impossible in this scenario. * **Option C (Hyperchloremic):** Chloride is lost in the vomitus as HCl; therefore, chloride levels will be low (hypochloremia), not high. **NEET-PG High-Yield Pearls:** * **Initial Urine:** Alkaline (due to $HCO_3^-$ excretion). * **Late Urine:** Acidic (**Paradoxical Aciduria**). * **Resuscitation Fluid of Choice:** **0.9% Normal Saline** (Isotonic saline). It addresses the volume deficit, corrects the chloride deficiency, and allows the kidney to stop the $Na^+/H^+$ exchange, thereby correcting the alkalosis. * **Potassium:** Should be replaced only after ensuring adequate urine output.

Question 163: Parenteral nutrition is not indicated in which of the following conditions?

A. Enterocutaneous fistula
B. Severe burns (Correct Answer)
C. Crohn's disease
D. Ileus

Explanation: The core principle of nutritional support is: **"If the gut works, use it."** Enteral nutrition (EN) is always preferred over Parenteral Nutrition (PN) because it maintains the gut mucosal barrier, prevents bacterial translocation, and carries a lower risk of infection. ### Why "Severe Burns" is the Correct Answer In **Severe Burns**, the metabolic demand is massive (hypermetabolic state). Current clinical guidelines (ASPEN/ESPEN) strongly emphasize **early enteral nutrition** (within 4–6 hours of injury). EN is superior in burn patients because it reduces the hypermetabolic response, prevents Curling’s ulcers, and significantly lowers the risk of sepsis compared to PN. PN is reserved only as a last resort if the GI tract is non-functional. ### Why the Other Options are Wrong * **Enterocutaneous Fistula (A):** High-output fistulas often require PN to allow "bowel rest," reducing secretions and facilitating spontaneous closure. * **Crohn’s Disease (C):** While EN is used, PN is indicated in patients with severe exacerbations, toxic megacolon, or short bowel syndrome where the inflamed gut cannot absorb nutrients. * **Ileus (D):** Postoperative or paralytic ileus involves a non-functional GI tract. Since the gut is not moving, enteral feeding is impossible, making PN a standard indication. ### High-Yield Clinical Pearls for NEET-PG * **Absolute Indication for PN:** Short bowel syndrome, high-output intestinal fistula, and complete intestinal obstruction. * **Most common complication of PN:** Catheter-related bloodstream infection (Sepsis). * **Most common metabolic complication:** Hyperglycemia. * **Refeeding Syndrome:** Characterized by **Hypophosphatemia** (most important), hypokalemia, and hypomagnesemia when feeding is restarted in a starved patient.

Question 164: What is the most preferred treatment for a pelvic abscess in the cul-de-sac?

A. Laparotomy
B. Colpotomy (Correct Answer)
C. External incision and drainage
D. Antibiotics

Explanation: **Explanation:** A pelvic abscess in the **cul-de-sac (Pouch of Douglas)** is a localized collection of pus at the most dependent part of the peritoneal cavity. The management principle for any abscess is "Ubi pus, ibi evacua" (where there is pus, evacuate it). **Why Colpotomy is Correct:** The Pouch of Douglas lies immediately adjacent to the **posterior vaginal fornix**. A **posterior colpotomy** (an incision through the vaginal wall into the pouch) provides the most direct, dependent, and least invasive route for drainage. It allows the abscess to drain via gravity without the morbidity of a major abdominal surgery. In males, the equivalent direct route is via the anterior rectal wall (proctotomy). **Analysis of Incorrect Options:** * **Laparotomy:** This is overly invasive. Opening the entire abdomen risks spreading the localized infection into the general peritoneal cavity (peritonitis) and carries higher postoperative morbidity. * **External Incision and Drainage:** The cul-de-sac is deep within the pelvis; an external skin incision (e.g., abdominal or inguinal) cannot reach this space directly without traversing multiple anatomical layers and organs. * **Antibiotics:** While used as an adjunct, antibiotics alone are usually insufficient for a walled-off abscess. Source control via drainage is mandatory for definitive treatment. **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Pelvic abscesses often present with "diarrhea and mucus" due to irritation of the rectal wall. * **Diagnosis:** The gold standard for initial assessment is a **per-rectal (PR) examination**, which reveals a boggy, tender mass in the rectovesical or rectouterine pouch. * **Modern Alternative:** In contemporary practice, **USG or CT-guided percutaneous drainage** is also a preferred minimally invasive option if a colpotomy is not feasible.

Question 165: 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?

A. Nipple to mid-thigh, including the genitalia (Correct Answer)
B. Epigastrium to the pubic symphysis
C. Chin to the pubic symphysis
D. Epigastrium to mid-thigh, including the genitalia

Explanation: ### 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.

Question 166: A 24-year-old computer technician presents with a progressive increase in the size of his left jaw. Following radiographic and biopsy confirmation of ameloblastoma, what is the recommended next step in management?

A. Radiotherapy
B. Laser beam therapy
C. Curettage and bone graft
D. Excision of lesion with 1-2 cm margin of normal mandible (Correct Answer)

Explanation: **Explanation:** **Ameloblastoma** is a benign but locally aggressive odontogenic tumor, most commonly occurring in the mandible (80%). The hallmark of this tumor is its high rate of local recurrence and its ability to infiltrate the surrounding medullary bone beyond its apparent radiographic margins. **Why Option D is Correct:** The gold standard treatment for ameloblastoma is **wide local excision with a 1–2 cm safety margin** of healthy bone. Because the tumor cells infiltrate the trabecular spaces of the bone, simple removal of the visible lesion is insufficient. Radical resection (segmental or marginal mandibulectomy) ensures that microscopic extensions are removed, significantly reducing the recurrence rate from over 50% (with conservative methods) to less than 5%. **Why Other Options are Incorrect:** * **Option A (Radiotherapy):** Ameloblastomas are generally radioresistant. Radiation is reserved only for inoperable cases or recurrent malignant ameloblastomas, as it also carries a risk of secondary post-radiation sarcoma. * **Option B (Laser beam therapy):** This is not a standard or effective treatment for deep-seated intraosseous bone tumors like ameloblastoma. * **Option C (Curettage):** While "enucleation and curettage" was historically practiced, it is now discouraged for most types (especially the multicystic/solid variety) because it leaves behind microscopic tumor nests, leading to a very high recurrence rate. **High-Yield Clinical Pearls for NEET-PG:** * **Radiographic Appearance:** Classically described as a **"Soap-bubble"** or **"Honey-comb"** appearance. * **Most Common Site:** Posterior mandible (angle and ramus). * **Unicystic Ameloblastoma:** A specific subtype seen in younger patients; it is less aggressive and may occasionally be treated with conservative enucleation. * **Histopathology:** Features "palisading" columnar cells with "reverse polarity" (Vickers-Gorlin criteria).

Question 167: What is the most common complication following splenectomy?

A. Left lower lobe atelectasis (Correct Answer)
B. Wound dehiscence
C. Pneumococcal septicemia
D. Deep vein thrombosis

Explanation: **Explanation:** The most common complication following a splenectomy is **Left lower lobe atelectasis**. **Why it occurs:** The spleen is located in the left upper quadrant, immediately beneath the left diaphragm. During surgery, the diaphragm is often irritated or manipulated. Postoperatively, patients experience pain in this region, leading to splinting (shallow breathing) and a reluctance to cough or take deep breaths. This results in the collapse of the small airways in the adjacent lung segment, making left-sided basal atelectasis the most frequent pulmonary complication, typically occurring within the first 24–48 hours. **Analysis of Incorrect Options:** * **Wound dehiscence:** While a potential complication of any abdominal surgery, it is not specific to splenectomy nor as common as pulmonary issues. * **Pneumococcal septicemia (OPSI):** Overwhelming Post-Splenectomy Infection (OPSI) is the most **dreaded** and serious late complication, but it is relatively rare (incidence <1%). *S. pneumoniae* is the most common organism involved. * **Deep vein thrombosis (DVT):** Splenectomy leads to reactive thrombocytosis (elevated platelets), which increases the risk of thromboembolic events like DVT or portal vein thrombosis, but these occur less frequently than immediate postoperative atelectasis. **NEET-PG High-Yield Pearls:** 1. **Most common complication:** Left lower lobe atelectasis. 2. **Most common late/serious complication:** OPSI (Overwhelming Post-Splenectomy Infection). 3. **Vaccination Protocol:** To prevent OPSI, patients should ideally be vaccinated 2 weeks **before** elective surgery or 2 weeks **after** emergency surgery against *S. pneumoniae, H. influenzae,* and *N. meningitidis*. 4. **Hematologic finding:** Presence of **Howell-Jolly bodies** on a peripheral smear is a classic sign of an absent or non-functioning spleen.

Question 168: Splenectomy predisposes to which type of infection?

A. Encapsulated bacterial infections (Correct Answer)
B. Amoebic infections
C. Bacteroides infections
D. Viral infections

Explanation: **Explanation:** The spleen is the body's largest lymphoid organ and plays a critical role in the immune system through two primary mechanisms: **mechanical filtration** and **humoral immunity**. **Why Option A is correct:** The spleen contains macrophages that filter the blood, removing poorly opsonized bacteria. More importantly, it is the primary site for the synthesis of **Tuftsin** and **Properdin**, which are essential for the alternative complement pathway. It also produces **IgM antibodies** necessary for opsonizing bacteria with polysaccharide capsules. In the absence of a spleen (asplenia), the body cannot effectively clear **encapsulated organisms**, leading to a life-threatening condition known as **Overwhelming Post-Splenectomy Infection (OPSI)**. The most common organisms involved are *Streptococcus pneumoniae* (most common), *Haemophilus influenzae* type B, and *Neisseria meningitidis*. **Why other options are incorrect:** * **B. Amoebic infections:** These are primarily cleared by cell-mediated immunity and gut-level defenses; the spleen is not the primary site for protozoal clearance. * **C. Bacteroides infections:** These are anaerobic bacteria. While the spleen handles systemic bacteremia, it does not have a specialized role in anaerobic defense compared to encapsulated aerobes. * **D. Viral infections:** Viral clearance depends largely on T-cell mediated immunity and Interferons, rather than the splenic filtration of opsonized particles. **High-Yield Clinical Pearls for NEET-PG:** * **Vaccination Protocol:** Patients should ideally be vaccinated **2 weeks before** elective splenectomy or **2 weeks after** emergency splenectomy. * **Prophylaxis:** Daily oral penicillin is often recommended, especially in children, for at least 2 years post-surgery or until age 16. * **Peripheral Smear:** Look for **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies post-splenectomy. * **OPSI Risk:** The risk is highest in the first 2 years post-splenectomy and is more common in children than adults.

Question 169: The long winter elevators (Nos. 14R and 14L) were designed for the removal of what?

A. Mandibular molar roots (Correct Answer)
B. Mandibular incisor roots
C. Mandibular canine roots
D. None of the above

Explanation: The **Winter elevators** (specifically the 14R and 14L variants) are specialized dental elevators designed with a "T-bar" handle and a triangular, pick-type blade. These are specifically engineered for the extraction of **mandibular molar roots**. ### Why Option A is Correct The design of the 14R (Right) and 14L (Left) elevators utilizes a powerful **wheel-and-axle mechanism**. They are primarily used when a mandibular molar is fractured at the bifurcation or when one root has been removed, leaving the other in the socket. The tip of the elevator is inserted into the empty socket, and the sharp point engages the interradicular septum to "elevate" or "pick out" the remaining root. The heavy T-handle provides the high torque necessary to overcome the dense cortical bone of the mandible in the molar region. ### Why Other Options are Incorrect * **Options B and C:** Mandibular incisors and canines are single-rooted teeth. The use of a heavy-duty Winter elevator on these teeth is contraindicated because the excessive force and the "pick" design are unnecessary and would likely cause significant alveolar bone fracture or damage to adjacent delicate structures. Single-rooted teeth are typically managed with straight elevators (e.g., Coupland) or Cryer elevators if a root fragment remains. ### High-Yield Clinical Pearls for NEET-PG * **Mechanism of Action:** Winter elevators work on the **Wheel and Axle** principle (most powerful elevator mechanism). * **Cryer Elevators:** Often confused with Winter elevators; however, Cryer elevators have a **straight handle** and work on the **Lever and Fulcrum** principle. * **Precaution:** Due to the immense force generated by the T-handle, Winter elevators must be used with extreme caution to avoid fracturing the mandible. * **Direction:** 14R is used for the distal root of the left side or the mesial root of the right side (and vice versa for 14L).

Question 170: Which of the following conditions are associated with an increased risk of post-splenectomy sepsis?

A. Idiopathic thrombocytopenic purpura (ITP)
B. Thalassemia (Correct Answer)
C. Hereditary spherocytosis
D. Trauma

Explanation: **Explanation:** The risk of **Overwhelming Post-Splenectomy Infection (OPSI)** or sepsis is not uniform across all patients; it depends significantly on the **underlying indication** for splenectomy and the **age** of the patient. **Why Thalassemia is Correct:** Patients undergoing splenectomy for **hematologic malignancies** or **chronic hemolytic anemias** (like Thalassemia major) carry the highest risk of post-splenectomy sepsis. In Thalassemia, the risk is elevated due to the underlying state of iron overload, chronic hemolysis, and a baseline suboptimal immune response. Statistics show that the incidence of OPSI in Thalassemia is significantly higher (approx. 8-25%) compared to trauma or ITP. **Analysis of Incorrect Options:** * **Trauma (Option D):** This carries the **lowest risk** of OPSI. These patients usually have a healthy immune system prior to the injury and may benefit from "splenosis" (autotransplantation of splenic tissue), which provides some residual immune function. * **ITP (Option A):** While there is a risk, it is much lower than in hemolytic anemias. The spleen is removed because it destroys platelets, not because of an inherent marrow failure or systemic hematologic crisis. * **Hereditary Spherocytosis (Option C):** Although a hemolytic anemia, the risk of sepsis post-splenectomy is lower than in Thalassemia, as the primary defect is limited to the red cell membrane and does not involve the complex systemic complications seen in major hemoglobinopathies. **NEET-PG High-Yield Pearls:** * **Most common organism in OPSI:** *Streptococcus pneumoniae* (50-90% of cases), followed by *H. influenzae* and *N. meningitidis*. * **Timing:** Risk is highest in the first **2 years** post-surgery, but the risk remains lifelong. * **Prevention:** Vaccines (Pneumococcal, Meningococcal, Hib) should be given **2 weeks before** elective surgery or **2 weeks after** emergency surgery. * **Prophylaxis:** Daily oral penicillin is recommended, especially in children, for at least 2 years post-splenectomy.

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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