General Surgery Principles Practice Questions

Q: Diabetic gangrene is due to:

All of the above. **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.

Q: What is true about a hypertrophic scar?

Develops within 2 to 6 weeks of injury. ### 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.

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

Diabetes. 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.

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

Saddle bag hernia. **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.

Q: Which fluid is the least irritant to the peritoneum?

Blood. ### 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).

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

Low operation. **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.

Question 1

What is the most common bacterial infection associated with lymphedema?

Accepted Answer

Streptococcus

Answer

Staphylococcus

Answer

E. coli

Answer

Pseudomonas

Question 2

Diabetic gangrene is due to:

Accepted Answer

All of the above

Answer

Ischemia

Answer

Increased blood glucose

Answer

Altered host defense and neuropathy

Question 3

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

Accepted Answer

Acute deep vein thrombosis (DVT)

Answer

Varicose ulcer

Answer

Pregnancy

Answer

Chronic deep vein thrombosis (DVT)

Question 4

What is true about a hypertrophic scar?

Accepted Answer

Develops within 2 to 6 weeks of injury

Answer

Grows beyond the original wound margins

Answer

Is typically pigmented

Answer

All of the above

Question 5

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?

Accepted Answer

Richter's hernia

Answer

Lymphadenitis

Answer

Diverticulitis

Answer

Volvulus

Question 6

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

Accepted Answer

Diabetes

Answer

Any suspicion of non-accidental injury

Answer

Any burn likely to require surgery

Answer

Burns on the hand

Question 7

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

Accepted Answer

Saddle bag hernia

Answer

Maydl's hernia

Answer

Velpeau hernia

Answer

Petit hernia

Question 8

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

Accepted Answer

Blood supply is maintained

Answer

Cough impulse is present

Answer

The hernia is irreducible

Answer

Severe pain is a characteristic symptom

Question 9

Which fluid is the least irritant to the peritoneum?

Accepted Answer

Blood

Answer

Urine

Answer

Bile

Answer

Pancreatic fluid

Question 10

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

Accepted Answer

Low operation

Answer

High operation

Answer

Inguinal operation

Answer

Laparoscopic surgery

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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