General Surgery Principles — MCQs

A lady presented to the emergency department with a stab injury to the left side of the abdomen. She was hemodynamically stable, and a contrast-enhanced CT scan revealed a laceration in the spleen. Laparoscopy was planned; however, the patient's PO2 suddenly dropped as soon as pneumoperitoneum was created. What is the most likely cause?

Q513Medium

In a patient recovering from peritonitis, which of the following would be the most characteristic sign of pelvic abscess?

Q514Easy

At what age is cleft lip repair commonly performed?

Q515Easy

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

Q516Easy

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

Q517Easy

The Gilbert classification system is used for which type of condition?

Q518Easy

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

Q519Medium

A 30-year-old obese male patient presents with a complete inguinal hernia. On examination, a doughy consistency is felt with a dull note on percussion. What does this suggest about the contents of the hernia sac?

Q520Medium

Which of the following is NOT a premalignant ulcer?

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 511: Which scoring system is used to diagnose the condition suggested by the surgical procedure shown?

A. Alvarado (Correct Answer)
B. Ranson
C. Mantrels
D. BISAP

Explanation: ***Alvarado*** - The **Alvarado score** is the standard scoring system used to diagnose **acute appendicitis**, incorporating clinical symptoms, signs, and laboratory findings. - It evaluates **migration of pain**, **anorexia**, **nausea/vomiting**, **tenderness in RLQ**, **rebound pain**, **elevated temperature**, and **leukocytosis** with **left shift**. *Ranson* - **Ranson criteria** are specifically used to assess the severity and prognosis of **acute pancreatitis**, not appendicitis. - It includes parameters like **age**, **WBC count**, **glucose**, **LDH**, and **AST** at admission and during the first 48 hours. *Mantrels* - **MANTRELS score** is a modified version of the Alvarado score for appendicitis but is **less commonly used** in clinical practice. - While it assesses similar parameters as Alvarado, it is **not the standard** or most widely accepted scoring system for appendicitis diagnosis. *BISAP* - **BISAP score** (Bedside Index for Severity in Acute Pancreatitis) is used to predict **severity** and **mortality** in **acute pancreatitis**. - It includes **BUN**, **impaired mental status**, **SIRS**, **age**, and **pleural effusion** - none relevant to appendicitis diagnosis.

Question 512: A lady presented to the emergency department with a stab injury to the left side of the abdomen. She was hemodynamically stable, and a contrast-enhanced CT scan revealed a laceration in the spleen. Laparoscopy was planned; however, the patient's PO2 suddenly dropped as soon as pneumoperitoneum was created. What is the most likely cause?

A. Gaseous embolism through splenic vessels (Correct Answer)
B. Injury to the left lobe of the diaphragm
C. Inferior vena cava compression
D. Injury to colon

Explanation: **Explanation:** The correct answer is **A. Gaseous embolism through splenic vessels.** **Mechanism of Action:** In the setting of a solid organ injury (like a splenic laceration), there are disrupted and open venous channels. When a pneumoperitoneum is created, the intra-abdominal pressure is intentionally raised (usually to 12–15 mmHg). If this insufflation pressure exceeds the venous pressure within the injured organ, the insufflating gas (typically $CO_2$) can be forced directly into the systemic circulation through the open splenic veins. This leads to a **gas embolism**, which travels to the right heart and pulmonary vasculature, causing a sudden drop in $PO_2$, hypotension, and potentially a "mill-wheel" murmur. **Analysis of Incorrect Options:** * **B. Injury to the left lobe of diaphragm:** While a diaphragmatic injury could cause respiratory distress, it would typically present with signs of a tension pneumothorax or bowel sounds in the chest. It does not explain the *sudden* drop specifically at the moment of insufflation as classically as an embolism does. * **C. Inferior vena cava compression:** High-pressure pneumoperitoneum can decrease venous return by compressing the IVC, leading to decreased cardiac output and hypotension. However, a sudden, isolated drop in $PO_2$ is more characteristic of an embolic event or V/Q mismatch. * **D. Injury to colon:** A colonic injury would lead to peritonitis or pneumoperitoneum (if not already present), but it would not cause an acute, intraoperative drop in oxygen saturation. **Clinical Pearls for NEET-PG:** * **Gas Embolism Management:** Immediate release of pneumoperitoneum, placing the patient in **Durant’s position** (Left lateral decubitus and Trendelenburg) to trap the gas in the apex of the right ventricle. * **Gold Standard Diagnosis:** Transesophageal Echocardiography (TEE) is the most sensitive method to detect gas bubbles in the heart. * **$CO_2$ Advantage:** $CO_2$ is used for insufflation because it is highly soluble in blood, reducing the severity and duration of an embolism compared to room air or $N_2O$.

Question 513: In a patient recovering from peritonitis, which of the following would be the most characteristic sign of pelvic abscess?

A. Tachycardia
B. Fever and abdominal pain
C. Mucus in stool
D. All of the above (Correct Answer)

Explanation: **Explanation:** A **pelvic abscess** is a common complication following generalized peritonitis (e.g., from a perforated appendix or diverticulitis), as infected fluid naturally tracks down into the rectovesical pouch (in men) or the pouch of Douglas (in women) due to gravity. **Why "All of the above" is correct:** The clinical presentation of a pelvic abscess is characterized by a combination of systemic inflammatory signs and local irritative symptoms: 1. **Tachycardia & Fever (Options A & B):** These are the hallmarks of a "swinging" pyrexia (hectic fever) and systemic toxicity. In a patient who was initially recovering from peritonitis but suddenly develops a new-onset fever and rising pulse rate, an occult abscess should be the first suspicion. 2. **Abdominal Pain (Option B):** While the pain may be localized to the lower abdomen or pelvis, it is a consistent feature of the inflammatory process. 3. **Mucus in Stool (Option C):** This is the **most characteristic localizing sign**. The abscess lies in direct contact with the anterior wall of the rectum. The resulting inflammation causes pelvic congestion and irritation of the rectal mucosa, leading to the discharge of mucus, a feeling of rectal fullness, and **tenesmus** (spurious diarrhea). **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** A **Digital Rectal Examination (DRE)** is the most important clinical step; it typically reveals a tender, boggy swelling in the anterior rectal wall. * **Imaging:** Contrast-enhanced CT (CECT) is the investigation of choice for localization. * **Management:** The classic dictum is "drainage where it points." Most pelvic abscesses are drained transrectally (or transvaginally) if they are palpable via DRE. * **High-Yield Sign:** Always look for "spurious diarrhea" or "mucus diarrhea" in a post-op patient as a trigger word for pelvic abscess.

Question 514: At what age is cleft lip repair commonly performed?

A. 0-3 months
B. 3-6 months (Correct Answer)
C. 6-9 months
D. 9-12 months

Explanation: **Explanation:** The timing for cleft lip repair is primarily guided by the **"Rule of 10s,"** which ensures the infant is physiologically stable enough to undergo general anesthesia and that the tissues are robust enough for a meticulous surgical repair. **Why 3-6 months is correct:** While the "Rule of 10s" suggests surgery can occur as early as 10 weeks, the standard clinical window is **3 to 6 months**. This period allows the infant to gain sufficient weight and hemoglobin levels, reducing anesthetic risk. Specifically, the Millard rotation-advancement flap (the most common technique) is ideally performed during this window to achieve optimal aesthetic and functional outcomes for the orbicularis oris muscle. **Analysis of Incorrect Options:** * **0-3 months:** Performing surgery too early (neonatal period) increases anesthetic risks due to immature hepatic and renal systems. While "neonatal repair" exists, it is not the standard of care for NEET-PG purposes. * **6-9 months & 9-12 months:** Delaying repair beyond 6 months is unnecessary and can interfere with early bonding and feeding. However, these timeframes are more relevant for **Cleft Palate repair**, which is typically performed between **6-12 months** (before the child develops significant speech patterns). **High-Yield Clinical Pearls for NEET-PG:** * **The Rule of 10s (Wilhelmmesen and Musgrave):** Weight > 10 lbs, Hemoglobin > 10 g/dL, WBC count < 10,000/mm³, and Age > 10 weeks. * **Surgical Technique:** **Millard’s Rotation-Advancement Flap** is the gold standard for unilateral cleft lip. **Tennison-Randall (Triangular flap)** is an alternative. * **Cleft Palate Timing:** Usually repaired at **6–12 months** to prevent speech defects (velopharyngeal insufficiency). * **Sequence of Management:** Lip repair (3-6m) → Palate repair (6-12m) → Bone grafting (9-11 years) → Rhinoplasty (after puberty).

Question 515: What is a complication of total parenteral nutrition (TPN)?

A. Congestive heart failure (CHF)
B. Hypochloremia (Correct Answer)
C. Metabolic acidosis
D. Leukopenia

Explanation: **Explanation:** Total Parenteral Nutrition (TPN) is a complex intravenous therapy that can lead to several metabolic and electrolyte imbalances. **Why Hypochloremia is the correct answer:** TPN solutions often contain high concentrations of organic acid salts, such as **acetate** or **lactate**, which are added as precursors to bicarbonate to prevent metabolic acidosis. When these anions are metabolized, they can lead to an excess of bicarbonate, causing a compensatory shift or excretion of chloride to maintain electrical neutrality. Furthermore, if the TPN formulation is not meticulously balanced, the relative lack of chloride compared to the high acetate load results in **hypochloremic metabolic alkalosis**. **Analysis of Incorrect Options:** * **A. Congestive Heart Failure (CHF):** While fluid overload can occur in TPN patients (leading to pulmonary edema), CHF itself is a clinical syndrome of pump failure, not a direct metabolic complication of the TPN solution. * **C. Metabolic Acidosis:** TPN is more commonly associated with metabolic **alkalosis** (due to acetate conversion). While "TPN-induced hyperchloremic metabolic acidosis" was historically seen with older synthetic amino acid solutions, modern formulations are designed to prevent this, making alkalosis/hypochloremia a more characteristic complication. * **D. Leukopenia:** TPN does not typically cause a decrease in white blood cells. In fact, catheter-related bloodstream infections (CRBSI) associated with TPN usually cause **leukocytosis**. **NEET-PG High-Yield Pearls:** * **Most common metabolic complication:** Hyperglycemia. * **Most common electrolyte abnormality:** Hypophosphatemia (part of **Refeeding Syndrome**). * **Hepatobiliary complication:** Cholestasis and cholelithiasis (due to lack of enteral stimulation and gallbladder stasis). * **Acid-Base Tip:** If a patient on TPN develops alkalosis, check the **Acetate** levels; if they develop acidosis, check the **Chloride** levels in the bag.

Question 516: Which classification best describes the surgical wound for an elective hemicolectomy for carcinoma of the colon?

A. Clean
B. Clean-contaminated (Correct Answer)
C. Dirty
D. Contaminated

Explanation: ### 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 (<2%), Clean-contaminated (3–11%), Contaminated (10–17%), Dirty (>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.

Question 517: The Gilbert classification system is used for which type of condition?

A. Inguinal and femoral hernias (Correct Answer)
B. Intestinal obstruction
C. Obturator hernia
D. Intestinal atresia

Explanation: **Explanation:** The **Gilbert Classification** is a widely used anatomical grading system specifically designed for **inguinal and femoral hernias**. Introduced by Arthur Gilbert in 1989 (and later modified by Rutkow and Robbins), it categorizes hernias based on the integrity of the internal ring and the posterior wall of the inguinal canal. **Breakdown of the Classification:** * **Type 1:** Small indirect hernia (tight internal ring). * **Type 2:** Medium indirect hernia (internal ring <2 cm). * **Type 3:** Large indirect hernia (internal ring >2 cm; sliding or scrotal). * **Type 4:** Direct hernia (full floor defect). * **Type 5:** Small direct hernia (diverticular defect). * **Type 6:** Combined (Saddlebag/Pantaloon) hernia. * **Type 7:** Femoral hernia. **Analysis of Incorrect Options:** * **Intestinal obstruction:** This is a clinical diagnosis usually classified by etiology (adhesions, volvulus) or level (high vs. low), not by the Gilbert system. * **Obturator hernia:** While a type of pelvic hernia, it is not included in the Gilbert system, which focuses on the groin (inguinal/femoral). * **Intestinal atresia:** This is a congenital neonatal condition classified by the **Grosfeld or Louw classification** (Types I-IV). **High-Yield Clinical Pearls for NEET-PG:** * **Nyhus Classification:** Another high-yield system for hernias; Type IIIa is a direct hernia, and Type IIIb is an indirect hernia with a weak floor. * **Lichtenstein Repair:** Currently the "gold standard" tension-free mesh repair for inguinal hernias. * **Amyand’s Hernia:** Appendix within an inguinal hernia sac. * **De Garengeot Hernia:** Appendix within a femoral hernia sac.

Question 518: Which one of the following does not cause post-splenectomy septicemia?

A. Streptococcus pneumoniae
B. Neisseria meningitides
C. Haemophilus influenza
D. Staphylococcus aureus (Correct Answer)

Explanation: **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).

Question 519: A 30-year-old obese male patient presents with a complete inguinal hernia. On examination, a doughy consistency is felt with a dull note on percussion. What does this suggest about the contents of the hernia sac?

A. Omentum (Correct Answer)
B. Large intestine
C. Small intestine
D. Encysted ascitic fluid

Explanation: ### Explanation The clinical presentation of a hernia depends significantly on its contents. In this case, the **doughy consistency** and **dullness on percussion** are classic diagnostic features of an **Omentocele** (omentum within the hernia sac). #### Why Omentum is Correct: * **Consistency:** Omentum is composed of fatty tissue, which feels soft, granular, or "doughy" upon palpation. * **Percussion:** Being a solid fatty structure, it yields a dull note. * **Clinical Hint:** It is often difficult to reduce and does not produce a gurgling sound (unlike bowel). #### Why Other Options are Incorrect: * **Small Intestine (Enterocele):** Typically feels elastic or "springy." On percussion, it is **tympanitic** (resonant) due to contained air. Auscultation may reveal bowel sounds (gurgling). * **Large Intestine:** While it may contain semi-solid stool, it usually presents with resonance due to gas. A doughy feel is less characteristic than it is for omentum. * **Encysted Ascitic Fluid (Hydrocele of the canal of Nuck/Cord):** This would present as a fluctuant, transilluminant (if clear fluid), and tense swelling rather than a doughy one. #### NEET-PG High-Yield Pearls: * **Enterocele:** Elastic consistency + Tympanitic percussion + Gurgling on reduction. * **Omentocele:** Doughy consistency + Dull percussion + No gurgling. * **Richter’s Hernia:** Only a part of the circumference of the bowel wall is trapped; it can strangulate without causing complete intestinal obstruction. * **Maydl’s Hernia:** "W" shaped loop where the intervening loop inside the abdomen is the one that strangulates first. * **Sliding Hernia (Hernie-en-glissade):** Part of the wall of the sac is formed by a retroperitoneal organ (e.g., cecum or bladder).

Question 520: Which of the following is NOT a premalignant ulcer?

A. Bazin's ulcer (Correct Answer)
B. Paget's disease of the nipple
C. Marjolin's ulcer
D. Lupus vulgaris

Explanation: **Explanation:** The correct answer is **A. Bazin’s ulcer**. A **premalignant ulcer** is a chronic inflammatory or infective lesion that has the potential to undergo malignant transformation into a malignancy (most commonly Squamous Cell Carcinoma). 1. **Why Bazin’s Ulcer is the correct answer:** Bazin’s ulcer, also known as **Erythema Induratum**, is a form of panniculitis (inflammation of subcutaneous fat) associated with Type IV hypersensitivity to *Mycobacterium tuberculosis*. It typically presents as tender, dusky nodules on the posterior calves of young women that may ulcerate. Unlike other chronic ulcers, it is **not** associated with malignant transformation. 2. **Analysis of Incorrect Options:** * **Paget’s disease of the nipple:** This is a form of intraepithelial adenocarcinoma. It presents as an eczematous-looking ulcer of the nipple-areola complex and is almost always associated with an underlying ductal carcinoma (DCIS or invasive). * **Marjolin’s ulcer:** This is a classic example of a premalignant lesion. It refers to a Squamous Cell Carcinoma (SCC) arising in a long-standing **chronic cicatrizing permanent scar** (e.g., old burn scars, chronic osteomyelitis sinuses, or venous ulcers). * **Lupus vulgaris:** This is a chronic, progressive form of cutaneous tuberculosis. If left untreated for years, it carries a significant risk of developing into SCC. **High-Yield Clinical Pearls for NEET-PG:** * **Marjolin’s Ulcer Characteristics:** It is typically a slow-growing, painless SCC. Because it occurs in scar tissue, it lacks lymphatic drainage; therefore, **lymph node metastasis is late** and rare initially. * **Other Premalignant Skin Lesions:** Actinic keratosis (most common), Bowen’s disease, Erythroplasia of Queyrat, and Xeroderma pigmentosum. * **Bazin’s Ulcer vs. Erythema Nodosum:** Bazin’s occurs on the **posterior** aspect of the leg (calves), while Erythema Nodosum occurs on the **anterior** aspect (shins).

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