General Surgery Principles — MCQs

An 80-year-old woman with a known history of femoral hernia is admitted to the hospital because of strangulation of the hernia. There is a tender swelling in the right femoral region immediately below and lateral to the pubic tubercle. She has had multiple bowel movements without relief of symptoms. What is the most likely diagnosis?

Q546Easy

Which of the following is NOT a criterion for admission to a burn ward?

Q547Medium

A patient presents with a direct inguinal hernia, but intra-operatively an indirect inguinal hernia is also observed. What is the diagnosis?

Q548Medium

Which of the following statements is NOT true about a strangulated hernia?

Q549Easy

Which fluid is the least irritant to the peritoneum?

Q550Easy

Lockwood's operation in the treatment of femoral hernia refers to which surgical approach?

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 541: What is the most common bacterial infection associated with lymphedema?

A. Staphylococcus
B. Streptococcus (Correct Answer)
C. E. coli
D. Pseudomonas

Explanation: **Explanation:** The correct answer is **Streptococcus (Option B)**. **Medical Concept:** Lymphedema results from impaired lymphatic drainage, leading to the accumulation of protein-rich interstitial fluid. This stagnant fluid acts as an ideal culture medium for bacteria. **Group A Beta-hemolytic Streptococcus** (specifically *Streptococcus pyogenes*) is the most common pathogen involved. These bacteria produce enzymes like hyaluronidase and streptokinase, which facilitate rapid spread through the subcutaneous tissues, leading to recurrent episodes of **cellulitis** or **erysipelas**. Each infection further damages the remaining lymphatic channels, creating a vicious cycle of worsening edema and recurrent infection. **Analysis of Incorrect Options:** * **Staphylococcus (Option A):** While *Staphylococcus aureus* is a common cause of skin and soft tissue infections (abscesses), it is less frequently the primary driver of spreading cellulitis in lymphedematous limbs compared to Streptococcus. * **E. coli (Option C):** This is a gram-negative enteric organism. It is a common cause of UTIs and intra-abdominal infections but is rarely the primary cause of lymphedema-associated cellulitis unless there is a specific source of contamination. * **Pseudomonas (Option D):** This opportunistic pathogen is typically associated with chronic wounds, burns, or "hot tub folliculitis," but it is not the leading cause of infection in primary or secondary lymphedema. **High-Yield Clinical Pearls for NEET-PG:** * **Recurrent Cellulitis:** This is the most common complication of chronic lymphedema. * **Stewart-Treves Syndrome:** A rare but high-yield complication where **Lymphangiosarcoma** develops in a limb with long-standing chronic lymphedema (classically post-mastectomy). * **Management:** The mainstay of preventing these infections is meticulous skin care and **Complex Decongestive Therapy (CDT)**. * **Filariasis:** Globally, *Wuchereria bancrofti* is the most common cause of secondary lymphedema, but the secondary bacterial infections are still predominantly Streptococcal.

Question 542: Diabetic gangrene is due to:

A. Ischemia
B. Increased blood glucose
C. Altered host defense and neuropathy
D. All of the above (Correct Answer)

Explanation: **Explanation:** Diabetic gangrene is a multifactorial complication resulting from the synergistic effect of metabolic, vascular, and neurological impairments. The correct answer is **"All of the above"** because each factor plays a critical role in the pathogenesis: 1. **Ischemia (Option A):** Diabetes causes both **macroangiopathy** (atherosclerosis of large vessels like the popliteal or tibial arteries) and **microangiopathy** (thickening of the capillary basement membrane). This leads to reduced perfusion and tissue hypoxia, preventing wound healing and promoting tissue death (gangrene). 2. **Increased Blood Glucose (Option B):** Hyperglycemia provides an ideal culture medium for bacteria. Furthermore, it leads to the formation of **Advanced Glycation End-products (AGEs)**, which damage vessel walls and impair collagen synthesis. 3. **Altered Host Defense and Neuropathy (Option C):** * **Neuropathy:** Sensory loss leads to repetitive unnoticed microtrauma; autonomic neuropathy causes dry, cracked skin (fissures); and motor neuropathy causes muscle atrophy and foot deformities (e.g., Charcot’s joint). * **Host Defense:** Hyperglycemia impairs **neutrophil functions** (chemotaxis, adherence, and phagocytosis), making diabetics highly susceptible to rapidly spreading infections. **Clinical Pearls for NEET-PG:** * **Wagner’s Classification** is used to grade diabetic foot ulcers (Grade 0 to 5). * The most common cause of non-traumatic lower limb amputation is diabetic gangrene. * **Monckeberg’s Sclerosis** (medial calcific sclerosis) is frequently seen in diabetic arteries, often leading to falsely elevated Ankle-Brachial Index (ABI) readings. * Diabetic gangrene is often a **"Wet Gangrene"** due to the high risk of secondary bacterial infection.

Question 543: What is an absolute contraindication for endovenous ablation in varicose veins?

A. Acute deep vein thrombosis (DVT) (Correct Answer)
B. Varicose ulcer
C. Pregnancy
D. Chronic deep vein thrombosis (DVT)

Explanation: **Explanation:** The primary goal of endovenous ablation (Radiofrequency or Laser) is to eliminate reflux in the superficial venous system. However, the procedure is strictly contraindicated in certain clinical scenarios to ensure patient safety. **Why Acute Deep Vein Thrombosis (DVT) is the Correct Answer:** **Acute DVT** is an **absolute contraindication**. In patients with acute DVT, the deep venous system is obstructed. The superficial veins (like the Great Saphenous Vein) act as essential collateral pathways for venous return from the lower limb. Ablating these superficial veins would destroy the only remaining outflow tract, leading to severe venous congestion and potentially phlegmasia cerulea dolens. Furthermore, the procedure carries a high risk of dislodging the fresh thrombus, causing a pulmonary embolism. **Analysis of Incorrect Options:** * **Varicose Ulcer:** This is actually an **indication** for ablation. Closing the refluxing vein reduces venous hypertension, which is the gold standard for healing venous ulcers (CEAP class C6). * **Pregnancy:** This is generally considered a **relative contraindication**. While procedures are avoided due to the hypercoagulable state and pelvic venous compression, it is not as definitive a physiological contraindication as an obstructed deep system. * **Chronic DVT:** If the deep system has recanalized and is functional, ablation can sometimes be performed. It is only contraindicated if the chronic DVT has resulted in total, non-recanalized obstruction where superficial veins are serving as critical collaterals. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Acute DVT, Acute Superficial Thrombophlebitis, and non-recanalized deep venous obstruction. * **Relative Contraindications:** Pregnancy, breastfeeding, poor general health, and tortuous veins (technical difficulty). * **EHIT (Endovenous Heat-Induced Thrombosis):** A known complication where a clot extends from the superficial system into the deep system post-procedure. * **Gold Standard Investigation:** Duplex Ultrasound is mandatory before ablation to confirm the patency of the deep venous system.

Question 544: What is true about a hypertrophic scar?

A. Grows beyond the original wound margins
B. Is typically pigmented
C. Develops within 2 to 6 weeks of injury (Correct Answer)
D. All of the above

Explanation: ### Explanation Hypertrophic scars and keloids are common topics in NEET-PG, representing aberrations in the normal wound-healing process. **Why Option C is Correct:** Hypertrophic scars typically follow a rapid onset, appearing within **2 to 6 weeks** after a cutaneous injury. This occurs during the proliferative phase of wound healing due to an overproduction of collagen (primarily Type III). Unlike keloids, hypertrophic scars often undergo a period of rapid growth followed by a static phase and eventual regression over 1–2 years. **Analysis of Incorrect Options:** * **Option A:** This is a classic feature of a **Keloid**. Hypertrophic scars stay strictly **within the margins** of the original wound. * **Option B:** Hypertrophic scars are generally erythematous (red/pink) due to increased vascularity, but they are not typically characterized by hyperpigmentation. Hyperpigmentation is more frequently associated with keloids in darker skin tones. **High-Yield Clinical Pearls for NEET-PG:** | Feature | Hypertrophic Scar | Keloid | | :--- | :--- | :--- | | **Margins** | Within wound boundaries | **Extends beyond** wound boundaries | | **Onset** | Early (2–6 weeks) | Late (months to years) | | **Regression** | Often regresses spontaneously | Rarely regresses | | **Site** | Flexor surfaces/Joints | Presternal, Earlobes, Deltoid | | **Collagen** | Parallel bundles (Type III) | Disorganized/Whorled (Type I & III) | | **Genetic Link** | No specific association | Associated with HLA-B14, B21 | **Management Note:** First-line treatment for both includes pressure therapy and silicone gel sheeting. Intralesional triamcinolone (steroids) is highly effective for symptomatic relief.

Question 545: An 80-year-old woman with a known history of femoral hernia is admitted to the hospital because of strangulation of the hernia. There is a tender swelling in the right femoral region immediately below and lateral to the pubic tubercle. She has had multiple bowel movements without relief of symptoms. What is the most likely diagnosis?

A. Lymphadenitis
B. Diverticulitis
C. Volvulus
D. Richter's hernia (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Richter's Hernia** The key to this diagnosis lies in the clinical presentation: the patient has signs of a **strangulated femoral hernia** (tender, irreducible swelling) but continues to have **multiple bowel movements**. In a **Richter’s hernia**, only a portion of the circumference of the bowel wall (usually the antimesenteric border) becomes trapped within the hernial sac. Because the entire lumen is not occluded, intestinal continuity is maintained. This allows the patient to pass flatus or feces despite the presence of strangulation and gangrene of the trapped segment. This is a surgical emergency because the trapped wall can necrose and perforate without the classic signs of high-grade intestinal obstruction (like absolute constipation or marked distension). **Why Incorrect Options are Wrong:** * **A. Lymphadenitis:** While Cloquet’s node (in the femoral canal) can enlarge and mimic a hernia, it would not explain the systemic symptoms or the specific association with a known femoral hernia history. * **B. Diverticulitis:** This typically presents with left lower quadrant pain and altered bowel habits, but it does not present as a discrete, tender mass below the inguinal ligament. * **C. Volvulus:** This involves twisting of the bowel loop, leading to rapid, complete mechanical obstruction and absolute constipation, which contradicts this patient's ability to pass stool. **NEET-PG High-Yield Pearls:** * **Common Sites:** Richter’s hernia most commonly occurs at the **femoral ring** (due to its rigid boundaries) followed by the inguinal ring and obturator canal. * **Femoral Hernia Anatomy:** It passes through the femoral canal, located **medial** to the femoral vein and **lateral** to the lacunar ligament. * **Clinical Trap:** Richter’s hernia is notorious for "silent" strangulation; the lack of obstructive symptoms often leads to a delay in diagnosis and higher mortality. * **De Garengeot Hernia:** Presence of the appendix within a femoral hernia sac. * **Amyand’s Hernia:** Presence of the appendix within an inguinal hernia sac.

Question 546: Which of the following is NOT a criterion for admission to a burn ward?

A. Any suspicion of non-accidental injury
B. Any burn likely to require surgery
C. Burns on the hand
D. Diabetes (Correct Answer)

Explanation: The criteria for admission to a specialized burn unit are based on the severity of the injury, the complexity of management, and the risk of long-term functional impairment. **Explanation of the Correct Answer:** **Option D (Diabetes)** is the correct answer because it is a **co-morbidity**, not a primary criterion for admission. While pre-existing medical conditions (like diabetes, cardiac disease, or renal failure) can complicate management and may necessitate hospitalization, they do not automatically mandate admission to a specialized *burn ward* unless the burn itself meets specific severity criteria. **Explanation of Incorrect Options:** * **Option A (Suspicion of non-accidental injury):** Any suspicion of child abuse or self-harm is a mandatory indication for admission to ensure patient safety and facilitate social/legal intervention. * **Option B (Burn likely to require surgery):** Full-thickness (3rd-degree) burns or deep partial-thickness burns that require skin grafting or surgical debridement must be managed in a specialized burn unit. * **Option C (Burns on the hand):** Burns involving "special areas" (face, hands, feet, genitalia, perineum, or major joints) require expert care to prevent contractures and preserve function, thus necessitating admission. **High-Yield Clinical Pearls for NEET-PG:** * **ABA Referral Criteria:** Admission is required for Partial-thickness burns >10% TBSA, burns in special areas, 3rd-degree burns, chemical/electrical burns, and inhalation injuries. * **Rule of Nines:** Used for quick TBSA estimation; remember that the **palm (including fingers)** of the patient represents approximately **1% TBSA**. * **Parkland Formula:** $4 \text{ mL} \times \text{kg} \times \% \text{TBSA}$ (Ringer’s Lactate). Give half in the first 8 hours and the remainder over the next 16 hours.

Question 547: A patient presents with a direct inguinal hernia, but intra-operatively an indirect inguinal hernia is also observed. What is the diagnosis?

A. Maydl's hernia
B. Velpeau hernia
C. Petit hernia
D. Saddle bag hernia (Correct Answer)

Explanation: **Explanation:** The correct diagnosis is a **Saddle bag hernia**, also known as a **Pantaloon hernia**. **1. Why it is correct:** A Pantaloon (Saddle bag) hernia occurs when both a **direct** and an **indirect** inguinal hernia coexist on the same side. The two hernial sacs are separated by the **inferior epigastric artery**, which acts like a "saddle." The direct component protrudes medial to the artery (through Hesselbach’s triangle), while the indirect component protrudes lateral to the artery (through the deep inguinal ring). **2. Why the other options are incorrect:** * **Maydl’s hernia:** Also known as a "retrograde strangulation," it involves two loops of bowel in the hernial sac with a central "U" loop remaining in the abdomen. The intra-abdominal loop is at the highest risk of strangulation. * **Velpeau hernia:** A rare type of femoral hernia where the sac is located **in front of** the femoral vessels (usually it is medial). * **Petit hernia:** A type of lumbar hernia that occurs through the **inferior lumbar triangle** (bounded by the iliac crest, latissimus dorsi, and external oblique). **3. Clinical Pearls for NEET-PG:** * **Nyhus Classification:** A Pantaloon hernia is classified as **Nyhus Type IIIc**. * **Hesselbach’s Triangle:** Boundaries are the lateral border of the rectus abdominis (medial), inferior epigastric vessels (lateral), and inguinal ligament (inferior). * **Amyand’s Hernia:** Appendix in an inguinal hernia sac. * **De Garengeot Hernia:** Appendix in a femoral hernia sac. * **Littre’s Hernia:** Meckel’s diverticulum in a hernia sac.

Question 548: Which of the following statements is NOT true about a strangulated hernia?

A. Cough impulse is present
B. Blood supply is maintained (Correct Answer)
C. The hernia is irreducible
D. Severe pain is a characteristic symptom

Explanation: In a **strangulated hernia**, the blood supply to the contents of the sac is compromised. This occurs when the pressure at the neck of the hernia exceeds the arterial perfusion pressure, leading to ischemia, gangrene, and potential perforation. Therefore, the statement "Blood supply is maintained" is **false**. ### Explanation of Options: * **A. Cough impulse is present (Incorrect Statement):** In strangulation, the neck of the hernia is tightly constricted. This "plugs" the opening, preventing the transmission of intra-abdominal pressure. Thus, the **cough impulse is characteristically lost**. (Note: While the question asks for the *most* incorrect statement, loss of cough impulse is a hallmark of strangulation). * **B. Blood supply is maintained (Correct Answer):** This is the defining pathological feature of strangulation. Ischemia occurs first in the veins (congestion) and then the arteries (infarction). * **C. The hernia is irreducible:** Irreducibility is the first stage toward strangulation. Once the contents are trapped (incarcerated) and cannot be returned to the cavity, the risk of vascular compromise increases. * **D. Severe pain is a characteristic symptom:** Unlike a simple reducible hernia, strangulation presents with sudden, intense, and persistent pain over the hernia site, often accompanied by systemic signs of toxicity or bowel obstruction (vomiting, distension). ### NEET-PG High-Yield Pearls: * **Richter’s Hernia:** Only a part of the bowel wall is strangulated; it may present with strangulation **without** signs of intestinal obstruction. * **Maydl’s Hernia:** Retrograde strangulation where two loops are in the sac but the intervening loop inside the abdomen is gangrenous. * **Clinical Sign:** A strangulated hernia is **tense, tender, and lacks a cough impulse.** * **Management:** It is a surgical emergency. Never attempt forceful reduction (Taxis) if strangulation is suspected, as it may return gangrenous bowel to the abdomen.

Question 549: Which fluid is the least irritant to the peritoneum?

A. Blood (Correct Answer)
B. Urine
C. Bile
D. Pancreatic fluid

Explanation: ### Explanation The degree of peritoneal irritation (peritonitis) depends on the pH, enzymatic activity, and bacterial load of the fluid involved. **1. Why Blood is the Correct Answer:** Blood is a physiological fluid with a neutral pH (7.4) and contains no digestive enzymes. While the presence of blood in the peritoneal cavity (hemoperitoneum) can cause mild discomfort and signs of peritoneal irritation over time (due to the breakdown of RBCs and release of cytokines), it is the **least irritant** among the options. In clinical practice, patients with a ruptured ectopic pregnancy or splenic trauma may have a significant amount of blood in the abdomen with surprisingly minimal guarding or rigidity compared to a hollow viscus perforation. **2. Why the Other Options are Incorrect:** * **Urine:** While initially sterile, urine is acidic and contains urea/creatinine. It is more irritating than blood but less so than bile or enzymes. * **Bile:** Bile is highly irritating to the peritoneum due to its detergent properties (bile salts). It causes intense chemical peritonitis. * **Pancreatic Fluid:** This is the **most irritant** fluid. It contains potent digestive enzymes (like trypsin and lipase) that cause "autodigestion" of the omentum and peritoneal lining, leading to severe, rapid-onset chemical peritonitis and systemic inflammatory response syndrome (SIRS). **3. Clinical Pearls for NEET-PG:** * **Hierarchy of Peritoneal Irritation:** Pancreatic juice > Gastric juice (low pH) > Bile > Urine > Blood. * **Pneumoperitoneum:** The most sensitive sign of hollow viscus perforation on an X-ray is "Air under the diaphragm." * **Bacterial Peritonitis:** While the fluids above cause *chemical* peritonitis, the most common cause of *bacterial* peritonitis is a perforated appendix or colonic diverticulum (fecal contamination).

Question 550: Lockwood's operation in the treatment of femoral hernia refers to which surgical approach?

A. Low operation (Correct Answer)
B. High operation
C. Inguinal operation
D. Laparoscopic surgery

Explanation: **Explanation:** The surgical management of femoral hernia involves three classic approaches, each named after the surgeon who popularized it. **Lockwood’s operation** is the **Low approach**, performed via an incision made below and parallel to the inguinal ligament, directly over the femoral swelling. 1. **Why Option A is Correct:** In Lockwood’s approach, the sac is cleared and opened below the inguinal ligament. After reducing the contents, the neck of the sac is ligated, and the femoral canal is closed by suturing the inguinal ligament to the pectineal ligament (Cooper’s ligament). It is the simplest method but provides limited access to the peritoneal cavity, making it unsuitable for strangulated hernias where bowel resection might be needed. 2. **Why Other Options are Incorrect:** * **Option B (High Operation):** Known as **McEvedy’s operation**. The incision is made in the rectus sheath (vertical/paramedian). It provides the best access for emergency cases with gangrenous bowel. * **Option C (Inguinal Operation):** Known as **Lotheissen’s operation**. The approach is through the inguinal canal (similar to inguinal hernia repair). It allows for a good repair but carries the risk of weakening the inguinal canal. * **Option D (Laparoscopic Surgery):** Modern techniques like TEP (Totally Extraperitoneal) or TAPP (Transabdominal Preperitoneal) are used but are not associated with the eponym "Lockwood." **High-Yield Clinical Pearls for NEET-PG:** * **Femoral Hernia:** More common in females; has the highest risk of strangulation among all hernias. * **Anatomy:** The hernia sac passes through the femoral canal, medial to the femoral vein and lateral to the lacunar ligament (Gimbernat’s ligament). * **Mnemonic for Approaches:** **L**ow = **L**ockwood; **M**iddle/Inguinal = **L**otheissen; **H**igh = **M**cEvedy.

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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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