General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 11: Which carbohydrate is related to blood grouping?

A. Arabinose
B. Xylullose
C. Xylose
D. Fucose (Correct Answer)

Explanation: **Explanation:** The correct answer is **Fucose (L-fucose)**. Blood group antigens (ABO system) are complex oligosaccharides located on the surface of red blood cells. The fundamental precursor for these antigens is the **H substance**. The formation of the H substance requires the attachment of **L-fucose** to a precursor terminal galactose unit, a reaction catalyzed by the enzyme *fucosyltransferase*. * **Type O:** Only the H substance (Fucose attached) is present. * **Type A:** N-acetylgalactosamine is added to the H substance. * **Type B:** Galactose is added to the H substance. Without Fucose, the A and B antigens cannot be anchored, leading to the rare **Bombay Phenotype (hh)**. **Analysis of Incorrect Options:** * **Arabinose:** A five-carbon sugar (pentose) primarily found in plant polysaccharides (hemicellulose) and used in bacterial culture media; it has no role in human blood group synthesis. * **Xylulose:** An intermediate in the pentose phosphate pathway and the uronic acid pathway. Accumulation of L-xylulose in urine is seen in the benign condition *Essential Pentosuria*. * **Xylose:** A wood sugar used clinically in the **D-xylose absorption test** to differentiate between malabsorption caused by mucosal disease (e.g., Celiac disease) and pancreatic insufficiency. **Clinical Pearls for NEET-PG:** 1. **Bombay Phenotype:** Individuals lack the H gene (hh) and cannot produce L-fucose linkage. They produce anti-H antibodies and can only receive blood from other Bombay phenotype donors. 2. **Secretor Status:** Determined by the *FUT2* gene, which controls the presence of ABO antigens in body fluids (saliva, semen). 3. **Sugar Specificity:** * Group A = N-acetylgalactosamine. * Group B = D-galactose. * Group O/H = L-fucose.

Question 12: What is the most important step in the repair of an indirect inguinal hernia?

A. Herniotomy
B. Narrowing of the internal ring (Correct Answer)
C. Bassini's repair
D. Transfixation of the neck of the sac

Explanation: **Explanation:** The fundamental pathology of an **indirect inguinal hernia** is a persistent processus vaginalis and a dilated **internal (deep) inguinal ring**. While several steps are involved in the surgical management, the most critical step to prevent recurrence and restore anatomy is the **narrowing of the internal ring** (Option B). This reinforces the "shutter mechanism" of the transversus abdominis muscle, which is the primary physiological defense against herniation at this site. **Analysis of Options:** * **A & D. Herniotomy and Transfixation of the neck:** These are the standard treatments for indirect hernias in **children** (where the pathology is purely a patent processus vaginalis). In adults, however, simply removing the sac without addressing the dilated internal ring leads to high recurrence rates. * **C. Bassini’s Repair:** This is a specific technique of tissue-based repair that involves suturing the conjoint tendon to the inguinal ligament. While it was once the gold standard, it is a method of posterior wall reinforcement rather than the "most important step" for the indirect component itself. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** Currently, the **Lichtenstein tension-free mesh repair** is the procedure of choice for adult inguinal hernias. * **The "Shutter Mechanism":** Contraction of the internal oblique and transversus abdominis muscles lowers them toward the inguinal ligament, shielding the internal ring. * **Anatomy:** An indirect hernia sac lies **lateral** to the inferior epigastric vessels, whereas a direct hernia lies **medial** (Hesselbach’s triangle). * **Most common hernia:** Indirect inguinal hernia is the most common type in both males and females.

Question 13: What is the management of a stage 2 pressure sore with a clean ulcer and no cellulitis?

A. Protective dressing
B. Moist dressing (Correct Answer)
C. Absorbent dressing
D. Topical antibiotics

Explanation: **Explanation:** The management of pressure ulcers is determined by their clinical stage. A **Stage 2 pressure sore** is characterized by partial-thickness skin loss involving the epidermis, dermis, or both. The ulcer is superficial and presents clinically as an abrasion, blister, or shallow crater. **Why Moist Dressing is Correct:** The gold standard for treating a clean Stage 2 ulcer is maintaining a **moist wound environment**. Modern wound care principles (based on Winter’s theory) demonstrate that moist environments facilitate faster re-epithelialization, promote autolytic debridement, and reduce pain compared to dry environments. Hydrocolloids or transparent films are typically used to maintain this moisture while acting as a barrier against contaminants. **Analysis of Incorrect Options:** * **Protective dressing (A):** While protection is necessary, a simple dry protective dressing can cause the wound bed to desiccate, slowing down the healing process and causing trauma during dressing changes. * **Absorbent dressing (C):** These (like alginates) are indicated for Stage 3 or 4 ulcers with **heavy exudate**. Stage 2 ulcers typically have minimal drainage; an absorbent dressing would over-dry the wound. * **Topical antibiotics (D):** These are **not recommended** for clean ulcers without evidence of clinical infection or cellulitis. Overuse leads to bacterial resistance and potential contact dermatitis. **NEET-PG High-Yield Pearls:** * **Stage 1:** Non-blanchable erythema of intact skin. (Management: Pressure relief/Turning). * **Stage 2:** Partial thickness (Epidermis/Dermis). (Management: Moist dressing). * **Stage 3:** Full thickness skin loss involving subcutaneous fat (but not fascia). * **Stage 4:** Full thickness loss with exposed muscle, bone, or tendon. (Management: Surgical debridement/Flaps). * **Most common site:** Sacrum, followed by the ischial tuberosity and greater trochanter.

Question 14: A child undergoes CECT Chest with contrast injection. Subsequently, the child develops progressive swelling, numbness, and pain on passive extension of fingers, and is reluctant to allow examination of the arm. Pulse is present. What is the immediate management step?

A. High-dose Prednisolone
B. Arterial Thrombectomy
C. Immediate Fasciotomy (Correct Answer)
D. Antihistamines and Anticoagulants

Explanation: ### **Explanation** The clinical presentation describes **Acute Compartment Syndrome (ACS)**, likely secondary to contrast extravasation or an iatrogenic vascular injury during the CECT. **1. Why "Immediate Fasciotomy" is correct:** The patient exhibits the classic "Ps" of compartment syndrome: **Pain** out of proportion to the injury, **Pain on passive extension** (the most sensitive early clinical sign), and **Paresthesia** (numbness). The presence of a **palpable pulse** does not rule out ACS, as intracompartmental pressure must exceed systolic pressure to stop the pulse, which happens only in late stages. ACS is a surgical emergency where increased pressure within a closed osteofascial space compromises tissue perfusion. Immediate fasciotomy is the definitive treatment to decompress the compartment and prevent irreversible ischemic necrosis and Volkmann’s Ischemic Contracture. **2. Why other options are incorrect:** * **High-dose Prednisolone:** Used for allergic reactions or spinal cord injuries; it has no role in relieving mechanical pressure within a muscle compartment. * **Arterial Thrombectomy:** Indicated for acute limb ischemia (the "6 Ps" including Pulselessness). In this case, the pulse is present, and the symptoms (pain on passive stretch) point specifically to compartment pressure rather than a proximal arterial block. * **Antihistamines and Anticoagulants:** Antihistamines treat anaphylactoid reactions to contrast. Anticoagulants are used for DVT or embolism but would be contraindicated here as they could worsen hematoma-induced compartment pressure. **3. Clinical Pearls for NEET-PG:** * **Earliest sign of ACS:** Pain out of proportion to injury. * **Most sensitive sign:** Pain on passive stretching of the involved muscles. * **Diagnosis:** Primarily clinical. However, a compartment pressure **>30 mmHg** or a Delta pressure (Diastolic BP – Compartment pressure) **<30 mmHg** confirms the diagnosis. * **Late sign:** Pulselessness and paralysis (indicates permanent damage). * **Commonest site:** Deep posterior compartment of the leg; Volar compartment of the forearm.

Question 15: Which of the following is not a complication of Total Parenteral Nutrition?

A. Metabolic bone disease
B. Essential fatty acid deficiency
C. Congestive cardiac failure (Correct Answer)
D. Hypophosphatemia

Explanation: **Explanation:** Total Parenteral Nutrition (TPN) is a life-saving intervention but is associated with numerous metabolic, mechanical, and infectious complications. **Why Congestive Cardiac Failure (CCF) is the correct answer:** While TPN can lead to fluid overload if not monitored, **CCF is not considered a direct or specific complication of TPN therapy itself.** Instead, TPN is more famously associated with **Refeeding Syndrome**, which can cause acute heart failure due to electrolyte shifts (specifically hypophosphatemia), but CCF as a standalone entity is not a classic TPN complication. **Analysis of Incorrect Options:** * **Metabolic Bone Disease (A):** This is a well-documented long-term complication of TPN. It is characterized by osteomalacia or osteoporosis, often due to vitamin D abnormalities, aluminum toxicity in the TPN solution, or hypercalciuria. * **Essential Fatty Acid Deficiency (EFAD) (B):** This occurs if TPN consists solely of glucose and amino acids without lipid emulsions. Clinical signs include a scaly dermatitis (dry, flaky skin) and alopecia. * **Hypophosphatemia (D):** This is the hallmark of **Refeeding Syndrome**. When a malnourished patient receives high-glucose TPN, insulin release causes an intracellular shift of phosphorus, leading to severe depletion that can cause respiratory failure and arrhythmias. **High-Yield Clinical Pearls for NEET-PG:** * **Most common metabolic complication:** Hyperglycemia. * **Most common life-threatening complication:** Catheter-related sepsis (usually *Staph. epidermidis*). * **Hepatobiliary complications:** TPN-associated cholestasis and cholelithiasis (due to lack of enteral stimulation and gallbladder stasis). * **Refeeding Syndrome triad:** Hypophosphatemia, Hypomagnesemia, and Hypokalemia.

Question 16: A funicular hernia is a type of:

A. Direct inguinal hernia
B. Indirect inguinal hernia (Correct Answer)
C. Femoral hernia
D. Umbilical hernia

Explanation: **Explanation:** A **funicular hernia** is a specific subtype of an **indirect inguinal hernia**. The classification depends on the degree of patency of the *processus vaginalis* (the embryonic developmental pouch of the peritoneum). 1. **Why Indirect Inguinal Hernia is correct:** In an indirect hernia, the sac enters the inguinal canal through the deep inguinal ring. In the **funicular variety**, the processus vaginalis is obliterated only at its lower end, just above the epididymis. Consequently, the hernial sac is enclosed within the spermatic cord (funiculus) but does **not** communicate with the tunica vaginalis. This distinguishes it from the "complete" or "vaginal" type, where the sac extends all the way into the scrotum and surrounds the testis. 2. **Why other options are incorrect:** * **Direct Inguinal Hernia:** These occur due to a weakness in the posterior wall of the inguinal canal (Hesselbach’s triangle) and are not related to the processus vaginalis. * **Femoral Hernia:** These protrude through the femoral canal, medial to the femoral vein and below the inguinal ligament. * **Umbilical Hernia:** These occur through the umbilical scar or paraumbilical defect in the linea alba. **High-Yield Clinical Pearls for NEET-PG:** * **Types of Indirect Hernia based on Sac Extent:** 1. **Bubonocele:** Sac limited to the inguinal canal. 2. **Funicular:** Sac extends through the superficial ring but stops above the testis. 3. **Complete (Vaginal):** Sac is continuous with the tunica vaginalis; the testis lies within the lower part of the sac. * The **Internal Inguinal Ring** is the site of origin for all indirect hernias. * Indirect hernias are located **lateral** to the inferior epigastric artery, whereas direct hernias are **medial**.

Question 17: From which of the following sites should a biopsy NOT be taken?

A. When the lesion subsides on local treatment (Correct Answer)
B. Area with large, spontaneous enlargement
C. A pigmented lesion
D. A white plaque like lesion

Explanation: ### Explanation The fundamental principle of a biopsy is to obtain a representative tissue sample from a **persistent or suspicious lesion** to establish a definitive diagnosis. **Why Option A is the Correct Answer:** If a lesion (such as an ulcer or swelling) **subsides or heals** with local treatment (e.g., antibiotics, topical steroids, or salt-water rinses), it indicates that the pathology was likely inflammatory or infectious rather than neoplastic. Performing a biopsy on a resolving lesion is unnecessary, clinically inappropriate, and would yield non-specific healing tissue rather than the primary pathology. **Analysis of Incorrect Options:** * **B. Area with large, spontaneous enlargement:** Rapid growth is a "red flag" for malignancy (e.g., high-grade sarcoma or lymphoma). These areas **must** be biopsied to rule out cancer. * **C. A pigmented lesion:** Any pigmented lesion showing changes in symmetry, border, or color (ABCDE criteria) requires a biopsy (preferably excisional) to rule out **Malignant Melanoma**. * **D. A white plaque-like lesion:** In the oral cavity or on mucosal surfaces, a persistent white plaque (Leukoplakia) is considered a **premalignant condition**. A biopsy is mandatory to check for dysplasia or squamous cell carcinoma. **Clinical Pearls for NEET-PG:** * **Indications for Biopsy:** Any lesion persisting for more than **2–3 weeks** despite removing local irritants. * **Site Selection:** Always biopsy the **edge of the lesion** (including some healthy tissue) for ulcers, but avoid necrotic centers as they do not provide viable cells. * **Pigmented Lesions:** Never perform an incisional biopsy on a suspected melanoma; **wide local excision** is the standard to prevent potential micro-metastasis and to accurately assess Breslow’s depth. * **Gold Standard:** Biopsy remains the gold standard for the definitive diagnosis of all suspected malignancies.

Question 18: Which of the following procedures is associated with the worst prognosis?

A. Cholecystectomy
B. Splenectomy (Correct Answer)
C. Nephrectomy
D. Appendectomy

Explanation: The correct answer is **Splenectomy**. ### **Explanation** The spleen plays a critical role in the body’s immune defense, particularly in filtering encapsulated bacteria and producing opsonins (like tuftsin and properdin). Among the listed procedures, **Splenectomy** carries the worst long-term prognosis due to the lifelong risk of **Overwhelming Post-Splenectomy Infection (OPSI)**. OPSI is a medical emergency characterized by a fulminant course, often progressing from mild flu-like symptoms to septic shock and death within 24–48 hours. The mortality rate for OPSI remains as high as 50-70%. ### **Analysis of Other Options** * **Cholecystectomy:** Removal of the gallbladder is a routine procedure. While it may cause minor digestive changes (post-cholecystectomy syndrome), it does not compromise the immune system or significantly reduce life expectancy. * **Nephrectomy:** A single healthy kidney can compensate for the loss of the other (compensatory hypertrophy). Patients with a solitary kidney usually maintain normal renal function and a standard lifespan. * **Appendectomy:** The appendix is a vestigial organ in adults. Its removal has no documented long-term negative impact on survival or systemic health. ### **NEET-PG High-Yield Pearls** * **Most common organisms in OPSI:** *Streptococcus pneumoniae* (most common), *Haemophilus influenzae* type B, and *Neisseria meningitidis*. * **Vaccination Protocol:** Patients should receive vaccinations against the above organisms at least **14 days before** elective surgery or **14 days after** emergency surgery. * **Prophylaxis:** Daily oral penicillin is often recommended for children post-splenectomy until at least age 5 or for at least 2 years post-procedure in adults. * **Hematologic markers:** Look for **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies on a peripheral smear post-splenectomy.

Question 19: An 18-year-old woman presents with abdominal pain localized to the right lower quadrant, nausea and vomiting, mild fever, and an elevation of the peripheral leukocyte count to 17,000/uL. Examination of the surgically resected appendix is most likely to reveal what pathological finding?

A. An appendix with a normal appearance.
B. Neutrophils within the muscular wall. (Correct Answer)
C. Lymphoid hyperplasia and multinucleated giant cells within the muscular wall.
D. A dilated lumen filled with mucus.

Explanation: ### Explanation **Correct Answer: B. Neutrophils within the muscular wall.** The clinical presentation—RLQ pain, nausea, vomiting, fever, and leukocytosis—is classic for **Acute Appendicitis**. The definitive histopathological hallmark required for the diagnosis of acute appendicitis is the presence of **neutrophilic infiltration within the muscularis propria** (muscular wall). While neutrophils may be seen in the mucosa due to various inflammatory conditions, their extension into the muscular layer signifies true acute inflammation of the organ. **Analysis of Incorrect Options:** * **Option A:** While "negative appendectomy" occurs in 15–20% of cases clinically suspected of appendicitis, the presence of significant leukocytosis (17,000/uL) and classic symptoms makes an inflamed appendix the "most likely" finding. * **Option C:** Lymphoid hyperplasia is a common *trigger* for appendicitis (by obstructing the lumen), but multinucleated giant cells are not typical. Giant cells suggest granulomatous inflammation (e.g., Crohn’s disease or Tuberculosis), which is less common than acute pyogenic appendicitis. * **Option D:** A dilated lumen filled with mucus describes a **Mucocele** of the appendix. This is usually caused by a mucinous cystadenoma or chronic obstruction without acute infection, and typically does not present with high fever and significant leukocytosis. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Histopathology showing neutrophils in the muscularis propria. * **Most Common Cause (Adults):** Fecalith (Appendicolith). * **Most Common Cause (Children):** Lymphoid hyperplasia (often post-viral). * **Alvarado Score:** A clinical scoring system (MANTRELS) used to decrease the rate of negative appendectomies. A score of $\geq$ 7 is highly suggestive of appendicitis. * **Sequence of Symptoms:** Periumbilical pain (visceral) $\rightarrow$ Vomiting $\rightarrow$ Migration to RLQ/McBurney’s point (somatic). This is known as **Murphy’s Triad**.

Question 20: OPSI is related to which organ?

A. Kidney
B. Brain
C. Lung
D. Spleen (Correct Answer)

Explanation: **Explanation:** **OPSI (Overwhelming Post-Splenectomy Infection)** is a life-threatening medical emergency specifically associated with the **Spleen**. The spleen plays a critical role in the immune system by filtering blood-borne pathogens and producing opsonins (like tuftsin and properdin) and IgM antibodies. These are essential for the phagocytosis of **encapsulated bacteria**. When the spleen is removed (splenectomy) or becomes non-functional (autosplenectomy in Sickle Cell Anemia), the body’s ability to clear these bacteria is severely compromised, leading to fulminant sepsis. **Why the other options are incorrect:** * **Kidney:** Renal failure leads to uremia and immunosuppression, but not the specific clinical syndrome of OPSI. * **Brain:** While the brain is susceptible to infections like meningitis, OPSI is a systemic hematogenous process triggered by the loss of splenic filtration. * **Lung:** Post-operative pulmonary complications (atelectasis, pneumonia) are common after any surgery, but they do not constitute the specific OPSI syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Organism:** *Streptococcus pneumoniae* (responsible for 50-90% of cases). Other culprits include *Haemophilus influenzae* type B and *Neisseria meningitidis*. * **Timing:** The risk is highest in the first **2 years** post-splenectomy, though the risk remains lifelong. It is more common in children than adults. * **Prevention:** * **Vaccination:** Against Pneumococcus, Meningococcus, and H. influenzae (ideally 2 weeks before elective surgery or 2 weeks after emergency surgery). * **Antibiotic Prophylaxis:** Daily oral Penicillin is often recommended, especially in children. * **Blood Picture:** Look for **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies on a peripheral smear 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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