General Surgery Principles Practice Questions

Q: Punched-out edges are characteristic of which type of ulcer?

Syphilitic. **Explanation:** The characteristic appearance of an ulcer’s edge is a vital clinical clue in surgery. A **punched-out edge** (where the edge is vertical and the ulcer appears as if cut out with a punch) is the hallmark of a **Syphilitic (Gummatous) ulcer**. This occurs due to endarteritis obliterans, which causes localized ischemia and rapid tissue necrosis, leading to sharply defined margins. **Analysis of Options:** * **Syphilitic (Correct):** Typically seen in the tertiary stage of syphilis. These ulcers are painless, circular or "serpiginous," with a "wash-leather" slough at the base and characteristic punched-out edges. * **Tuberculosis:** Characterized by **undermined edges**. This happens because the disease process (caseous necrosis) destroys the subcutaneous tissue faster than the overlying skin. * **Rodent Ulcer (Basal Cell Carcinoma):** Characterized by **rolled-out (pearly) edges**. This is a slow-growing malignant ulcer that locally invades tissue but rarely metastasizes. * **Non-specific (Chronic/Venous):** Usually presents with **sloping edges**, indicating an attempt at healing where new epithelium grows over the granulation tissue. **NEET-PG High-Yield Pearls:** * **Punched-out edges** are also seen in **Trophic (Neuropathic) ulcers** (e.g., Diabetes, Leprosy) and **Arterial (Ischemic) ulcers**. * **Everted edges** are a classic sign of **Squamous Cell Carcinoma**. * **Wash-leather slough** is specifically associated with Syphilitic ulcers. * **Apple-jelly nodules** on the edge are characteristic of Lupus Vulgaris (Cutaneous TB).

Q: Which one of the following surgical procedures is considered to have a clean-contaminated wound?

Elective open cholecystectomy for cholelithiasis. ### Explanation The classification of surgical wounds is a high-yield topic for NEET-PG, based on the **CDC Surgical Wound Classification**, which predicts the risk of surgical site infection (SSI). **1. Why Option A is Correct:** An **elective open cholecystectomy** is classified as **Clean-Contaminated (Class II)**. This category includes procedures where a hollow viscus (respiratory, alimentary, genital, or urinary tract) is entered under controlled conditions and without unusual contamination. In this case, the biliary tract is entered, but since it is elective and for simple cholelithiasis (no acute inflammation or bile spill), it fits Class II. **2. Analysis of Incorrect Options:** * **Option B (Herniorrhaphy with mesh):** This is a **Clean (Class I)** wound. It is an elective procedure where no hollow viscus is entered, and there is no break in aseptic technique. * **Option C (Lumpectomy):** This is also a **Clean (Class I)** wound. Breast surgery and axillary dissections do not involve the respiratory or GI tracts. * **Option D (Appendectomy with abscess):** This is a **Dirty/Infected (Class IV)** wound. Any procedure involving a pre-existing clinical infection, perforated viscera, or pus/abscess falls into this category. (Note: A simple non-perforated appendectomy is Class II). **3. Clinical Pearls for NEET-PG:** * **Clean (Class I):** No inflammation, no entry into tracts. SSI risk: <2%. * **Clean-Contaminated (Class II):** Controlled entry into tracts. SSI risk: <10%. * **Contaminated (Class III):** Accidental open wounds, gross spillage from GI tract, or acute non-purulent inflammation (e.g., acute cholecystitis). SSI risk: 15-20%. * **Dirty (Class IV):** Traumatic wounds with devitalized tissue, fecal contamination, or established infection/abscess. SSI risk: Up to 40%.

Q: Which classification best describes the surgical wound for an elective hemicolectomy for carcinoma of the colon?

Clean-contaminated. ### Explanation The classification of surgical wounds is based on the degree of microbial contamination at the time of surgery, which directly correlates with the risk of postoperative surgical site infection (SSI). **Why "Clean-contaminated" is correct:** An elective hemicolectomy involves the controlled entry into a hollow viscus (the colon) under elective, prepared conditions. According to the CDC classification, **Clean-contaminated (Class II)** wounds are those where the respiratory, alimentary, genital, or urinary tracts are entered under controlled conditions and without unusual contamination. Since the colon is part of the alimentary tract, its elective entry makes it a Class II wound. **Analysis of Incorrect Options:** * **Clean (Class I):** These are uninfected operative wounds in which no inflammation is encountered and the respiratory, alimentary, genital, or urinary tracts are **not** entered. Examples include hernia repair or thyroidectomy. * **Contaminated (Class III):** These involve open, fresh, accidental wounds or operations with major breaks in sterile technique or gross spillage from the gastrointestinal tract. An elective procedure with controlled entry does not fall here. * **Dirty (Class IV):** These are old traumatic wounds with retained devitalized tissue or those that involve existing clinical infection or perforated viscera (e.g., perforated diverticulitis or a fecal abscess). **Clinical Pearls for NEET-PG:** * **Infection Rates:** Clean ( 27%). * **Key Distinction:** If a hollow viscus is entered, it is at least **Clean-contaminated**. If there is "spillage," it becomes **Contaminated**. If there is "pus/perforation" already present, it is **Dirty**. * **Cholecystectomy:** Elective is Clean-contaminated; however, if there is acute inflammation (acute cholecystitis), it is often classified as Contaminated.

Q: Which one of the following does not cause post-splenectomy septicemia?

Staphylococcus aureus. **Explanation:** The spleen plays a critical role in the body’s immune defense, particularly in filtering and phagocytosing **encapsulated bacteria**. Post-splenectomy, patients are at a lifelong risk of **Overwhelming Post-Splenectomy Infection (OPSI)**, which is primarily caused by organisms that require splenic opsonization for clearance. **Why Staphylococcus aureus is the correct answer:** *Staphylococcus aureus* is a Gram-positive coccus that is **not encapsulated**. While it can cause various infections, it is not a classic cause of the rapid, fulminant septicemia associated with the asplenic state. OPSI is specifically characterized by a failure to clear encapsulated organisms via the alternative complement pathway and splenic macrophages. **Why the other options are incorrect:** * **Streptococcus pneumoniae (Option A):** The most common cause of OPSI (responsible for 50–90% of cases). It is a heavily encapsulated organism. * **Haemophilus influenzae type b (Option C):** A major encapsulated pathogen, especially in children, against which splenectomy patients must be vaccinated. * **Neisseria meningitidis (Option B):** Another key encapsulated organism that causes rapid-onset sepsis and meningitis in asplenic individuals. **High-Yield Clinical Pearls for NEET-PG:** * **OPSI Timing:** Most common within the first **2 years** post-surgery, but the risk remains lifelong. * **Prevention:** Patients should receive vaccinations against *S. pneumoniae, H. influenzae,* and *N. meningitidis* ideally **2 weeks before** elective surgery or **2 weeks after** emergency surgery. * **Prophylaxis:** Daily oral penicillin is often recommended, especially in children, for at least 2 years post-splenectomy. * **Other Organisms:** Asplenic patients are also at increased risk of severe malaria and *Babesiosis* (transmitted by ticks).

Q: Which of the following is a non-absorbable suture material?

Nylon. **Explanation:** Suture materials are broadly classified into **absorbable** and **non-absorbable** based on whether the body’s tissues will degrade and digest the material over time. **Correct Answer: D. Nylon (Polyamide)** Nylon is a synthetic, non-absorbable monofilament suture. It provides high tensile strength and undergoes very slow progressive hydrolysis, but for clinical purposes, it is considered permanent. It is the gold standard for skin closure because it causes minimal tissue reaction and has a smooth surface that prevents "bacterial wicking." **Incorrect Options:** * **A. Catgut:** A natural absorbable suture derived from the submucosa of sheep intestine or serosa of bovine intestine. It is degraded by enzymatic digestion. * **B. Fascia lata:** A biological material (autograft or allograft) used in reconstructive surgeries. Like all biological tissues used as sutures, it is eventually incorporated or absorbed by the body. * **C. Polyglycolic acid (Dexon):** A synthetic, braided, absorbable suture. It is degraded by hydrolysis rather than enzymatic action, leading to more predictable absorption rates and less inflammation than catgut. **High-Yield Clinical Pearls for NEET-PG:** * **Natural vs. Synthetic:** Natural sutures (Catgut, Silk) cause more tissue reaction than synthetic ones (Nylon, Prolene, Vicryl). * **Absorption Mechanism:** Natural sutures are absorbed by **proteolysis/enzymatic digestion**, while synthetic absorbable sutures are degraded by **hydrolysis**. * **Prolene (Polypropylene):** The non-absorbable suture of choice for vascular anastomoses and fascia closure (linea alba) due to its high tensile strength and inertness. * **Vicryl (Polyglactin 910):** A popular synthetic braided absorbable suture; its coated version is widely used for soft tissue approximation.

Q: Corpus callosotomy is useful in the treatment of which condition?

Epilepsy. **Explanation:** **Corpus callosotomy** is a palliative surgical procedure primarily used in the management of **refractory epilepsy**, specifically for patients who suffer from "drop attacks" (atonic seizures) or generalized tonic-clonic seizures that do not respond to medical therapy. **Why Epilepsy is the Correct Answer:** The corpus callosum is the largest white matter tract connecting the two cerebral hemispheres. In certain types of epilepsy, an electrical storm begins in one hemisphere and rapidly spreads to the other via these fibers, leading to a generalized seizure. By performing a "split-brain" surgery (severing the corpus callosum), the inter-hemispheric spread of synchronized electrical activity is interrupted. While this may not stop the focal seizure itself, it prevents generalization, thereby reducing the frequency and severity of drop attacks and improving patient safety. **Why Other Options are Incorrect:** * **Stroke:** Management involves thrombolysis, thrombectomy, or decompressive craniectomy (for edema). Surgery on the corpus callosum has no role in restoring blood flow or preventing ischemic damage. * **Alzheimer’s Disease:** This is a neurodegenerative condition characterized by amyloid plaques and tau tangles. Treatment is pharmacological (e.g., Donepezil); there is no surgical indication for callosotomy here. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** Best for **Atonic seizures** (drop attacks) and Lennox-Gastaut Syndrome. * **Extent:** Usually, an **anterior two-thirds callosotomy** is performed first to minimize "disconnection syndrome." * **Disconnection Syndrome:** A potential complication where the two hemispheres cannot communicate, leading to symptoms like alien hand syndrome or inability to name objects placed in the left hand (anomia). * **Vagus Nerve Stimulation (VNS):** Another high-yield neuromodulation technique used for refractory epilepsy.

Q: Which of the following causes the least irritation to the peritoneal cavity?

Blood. The severity of peritonitis depends on the pH, chemical composition, and bacterial load of the fluid entering the peritoneal cavity. **Explanation of the Correct Answer:** **Blood (Option B)** is the least irritating substance to the peritoneum. While blood acts as an excellent culture medium for bacteria (increasing the risk of delayed sepsis), it is chemically neutral and does not cause significant immediate chemical inflammation. Patients with a hemoperitoneum (e.g., ruptured ectopic pregnancy or splenic trauma) often present with surprisingly mild abdominal tenderness compared to those with hollow viscus perforation. **Analysis of Incorrect Options:** * **Gastric Juice (Option D):** This is the **most irritating** substance due to its extremely low pH (acidic). A perforated peptic ulcer causes immediate, intense "board-like" rigidity and agonizing pain (chemical peritonitis). * **Pancreatic Enzymes (Option C):** These are highly caustic. In acute pancreatitis, the release of activated trypsin and lipase leads to severe chemical fat necrosis and profound systemic inflammatory response. * **Bile (Option A):** Bile is highly irritating and causes intense chemical peritonitis. While sterile bile is less toxic than infected bile, it still causes significant fluid shifts and pain. **NEET-PG High-Yield Pearls:** 1. **Hierarchy of Peritoneal Irritation:** Gastric juice > Pancreatic juice > Bile > Urine > Blood. 2. **Clinical Sign:** The "Board-like rigidity" is most characteristic of perforated peptic ulcers (Gastric juice). 3. **Pneumoperitoneum:** While gastric juice is the most irritating, the presence of free air under the diaphragm is the classic radiological sign of hollow viscus perforation. 4. **Bacterial Peritonitis:** While blood is least irritating initially, it has the highest risk of secondary infection if bacteria are introduced.

Question 1

Punched-out edges are characteristic of which type of ulcer?

Accepted Answer

Syphilitic

Answer

Tuberculosis

Answer

Rodent ulcer

Answer

Non-specific

Question 2

Which one of the following surgical procedures is considered to have a clean-contaminated wound?

Accepted Answer

Elective open cholecystectomy for cholelithiasis

Answer

Herniorrhaphy with mesh repair

Answer

Lumpectomy with axillary node dissection

Answer

Appendectomy with walled off abscess

Question 3

What is a complication of total parenteral nutrition (TPN)?

Accepted Answer

Hypochloremia

Answer

Congestive heart failure (CHF)

Answer

Metabolic acidosis

Answer

Leukopenia

Question 4

Which classification best describes the surgical wound for an elective hemicolectomy for carcinoma of the colon?

Accepted Answer

Clean-contaminated

Answer

Clean

Answer

Dirty

Answer

Contaminated

Question 5

Which one of the following does not cause post-splenectomy septicemia?

Accepted Answer

Staphylococcus aureus

Answer

Streptococcus pneumoniae

Answer

Neisseria meningitides

Answer

Haemophilus influenza

Question 6

Which of the following is NOT a premalignant ulcer?

Accepted Answer

Bazin's ulcer

Answer

Paget's disease of the nipple

Answer

Marjolin's ulcer

Answer

Lupus vulgaris

Question 7

Which of the following is a non-compressible swelling?

Accepted Answer

Lymphangioma

Answer

Meningocele

Answer

Mucocele

Answer

Cystic hygroma

Question 8

Which of the following is a non-absorbable suture material?

Accepted Answer

Nylon

Answer

Catgut

Answer

Fascialata

Answer

Polyglycolic acid

Question 9

Corpus callosotomy is useful in the treatment of which condition?

Accepted Answer

Epilepsy

Answer

Stroke

Answer

Alzheimer's disease

Answer

None of the above

Question 10

Which of the following causes the least irritation to the peritoneal cavity?

Accepted Answer

Blood

Answer

Bile

Answer

Pancreatic enzymes

Answer

Gastric juice

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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