General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 731: Which of the following is a hernia not related to the abdominal wall?

A. Amyand's hernia
B. Richter's hernia
C. Little's hernia
D. Peterson hernia (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Peterson hernia**. The fundamental distinction lies in the location of the hernia. While most common hernias involve a defect in the abdominal wall (external hernias), a **Peterson hernia** is an **internal hernia**. It occurs through a defect in the mesentery created during gastrointestinal surgery, most commonly following a **Roux-en-Y gastric bypass**. The bowel loops herniate through the "Peterson’s space" (the gap between the limb of the roux limb and the transverse mesocolon), leading to potential internal strangulation without any visible external bulge. **Analysis of Incorrect Options:** * **A. Amyand's hernia:** This is an inguinal hernia (abdominal wall defect) where the **appendix** is found within the hernial sac. * **B. Richter's hernia:** This involves the herniation of only a **portion of the bowel wall circumference** through an abdominal wall defect. It is dangerous because it can strangulate without causing complete intestinal obstruction. * **C. Littre's hernia:** This is an abdominal wall hernia (usually inguinal or femoral) that contains a **Meckel’s diverticulum** within the sac. **High-Yield Clinical Pearls for NEET-PG:** * **Garengeot Hernia:** Appendix within a femoral hernia sac. * **Maydl’s Hernia:** "W-shaped" hernia containing two loops of bowel; the loop inside the abdomen is at highest risk of strangulation. * **Pantaloons Hernia:** Coexistence of direct and indirect inguinal hernias on the same side. * **Peterson’s Space:** Always remember this in the context of post-bariatric surgery complications and internal hernias.

Question 732: Arthrocentesis can be performed efficiently by:

A. Single needle technique
B. Two needle technique (Correct Answer)
C. Both of the above
D. None

Explanation: **Explanation:** Arthrocentesis, specifically in the context of **arthroscopic joint lavage**, is most efficiently performed using the **Two-needle technique**. This method involves the insertion of two separate needles into the joint space: one serves as an **inflow** port for the irrigating fluid (usually normal saline), and the second serves as an **outflow** port. **Why the Two-needle technique is correct:** The primary goal of therapeutic arthrocentesis is to "wash out" inflammatory mediators, debris, or crystals from the joint. The two-needle system creates a **continuous flow circuit**. This allows for a high-volume, low-pressure irrigation that effectively clears the joint space without the need for repeated aspirations, making the procedure faster and more thorough than a single-point entry. **Why other options are incorrect:** * **Single needle technique:** While commonly used for simple aspiration of an effusion or injecting corticosteroids, it is inefficient for joint lavage. It requires a "push-pull" (tidal) mechanism, which often fails to remove larger debris and takes significantly longer to achieve the same level of joint clearance. * **Both/None:** Since the two-needle technique offers a specific mechanical advantage for efficient irrigation and lavage, it is the preferred clinical standard for this purpose. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Arthrocentesis is both diagnostic (e.g., checking for crystals in Gout or WBCs in Septic Arthritis) and therapeutic (e.g., relieving pressure or joint lavage). * **Joint Lavage:** Often used in the management of **Temporomandibular Joint (TMJ)** disorders and early-stage osteoarthritis to remove cytokines. * **Safety:** Always ensure the patient is in a comfortable position with the joint slightly flexed to maximize the joint space volume before needle insertion.

Question 733: Which of the following is not seen in pseudogout?

A. Small joints affected (Correct Answer)
B. Large joints affected
C. Chondrocalcinosis
D. Deposition of calcium pyrophosphate

Explanation: **Explanation:** **Pseudogout**, also known as **Calcium Pyrophosphate Deposition Disease (CPPD)**, is a crystal-induced arthropathy characterized by the deposition of calcium pyrophosphate dihydrate crystals in the joint space. 1. **Why "Small joints affected" is the correct answer:** Unlike Gout, which typically involves small joints (classically the first metatarsophalangeal joint or Podagra), Pseudogout predominantly affects **large joints**. The **knee** is the most common site (involved in >50% of cases), followed by the wrists, hips, and shoulders. Small joint involvement is rare and not a characteristic feature, making this the "except" or incorrect statement. 2. **Analysis of other options:** * **Large joints affected:** This is a hallmark of Pseudogout. It typically presents as an acute monoarthritis of the knee or wrist in elderly patients. * **Chondrocalcinosis:** This refers to the radiographic calcification of hyaline or fibrocartilage. It is the classic imaging finding in CPPD, often seen as linear opacities in the meniscus of the knee or the triangular cartilage of the wrist. * **Deposition of calcium pyrophosphate:** This is the underlying pathophysiology. These crystals are **rhomboid-shaped** and show **weak positive birefringence** under polarized microscopy (unlike the needle-shaped, negatively birefringent urate crystals in gout). **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** More common in the elderly (>60 years). * **Associated Conditions:** Always screen for **Hyperparathyroidism, Hemochromatosis, Hypomagnesemia, and Hypophosphatasia**. * **Synovial Fluid:** Look for rhomboid crystals with positive birefringence. * **Treatment:** Acute management involves NSAIDs, Colchicine, or intra-articular corticosteroids.

Question 734: Hernia into the pouch of Douglas is a __________ hernia?

A. Beclard's
B. Bochdalek's
C. Blandin's
D. Brenner's (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Brenner’s Hernia**. A **Brenner’s hernia** is a rare form of internal hernia where the abdominal contents (usually a loop of small bowel) protrude into the **Pouch of Douglas** (the rectouterine pouch in females or the rectovesical pouch in males). This occurs due to a defect or excessive depth in the pelvic peritoneum. ### Analysis of Options: * **A. Beclard’s Hernia:** This is a rare variation of a femoral hernia that occurs through the opening for the **saphenous vein** (saphenous opening/fossa ovalis). * **B. Bochdalek’s Hernia:** This is the most common type of **congenital diaphragmatic hernia**, occurring through a posterolateral defect in the diaphragm (usually on the left side) due to the failure of the pleuroperitoneal canal to close. * **C. Blandin’s Hernia:** This refers to a hernia into the **interfoveolar fossa**, which is a depression located between the inferior epigastric artery and the medial umbilical ligament. ### NEET-PG High-Yield Pearls: * **Pouch of Douglas:** The most dependent part of the peritoneal cavity; common site for pelvic abscesses and "drop metastases" (Krukenberg tumors). * **Cloquet’s Hernia:** A femoral hernia where the sac remains under the pectineal fascia. * **Velpeau Hernia:** A femoral hernia located in front of the femoral vessels. * **Richter’s Hernia:** Only a part of the circumference of the bowel wall is trapped; it can strangulate without causing complete intestinal obstruction. * **Littre’s Hernia:** A hernia containing a **Meckel’s diverticulum**.

Question 735: In an elective laparoscopic cholecystectomy with no gross spillage, what is the recommended antibiotic prophylaxis?

A. A single dose of preoperative intravenous antibiotic followed by a 5-day course of oral antibiotics
B. Postoperative intravenous antibiotics for 1 day followed by a 5-day course of oral antibiotics
C. A single dose of preoperative intravenous antibiotic only (Correct Answer)
D. A 5-day course of oral antibiotics only

Explanation: **Explanation:** The primary goal of surgical antibiotic prophylaxis (SAP) is to achieve therapeutic tissue levels of the drug at the time of the first incision to prevent Surgical Site Infections (SSIs). **1. Why Option C is Correct:** Laparoscopic cholecystectomy is classified as a **Clean-Contaminated** surgery. According to standard guidelines (e.g., SCIP, ASHP), for elective, uncomplicated laparoscopic procedures where no gross spillage occurs, a **single dose of a preoperative intravenous antibiotic** (typically a first or second-generation cephalosporin like Cefazolin) administered within 60 minutes of the skin incision is sufficient. Extending antibiotics into the postoperative period does not further reduce the risk of SSI but does increase the risk of antibiotic resistance and *Clostridioides difficile* infection. **2. Why the other options are incorrect:** * **Options A, B, and D:** These options suggest prolonged postoperative courses (5 days or oral switches). In the absence of active infection (e.g., acute cholecystitis, cholangitis, or gallbladder perforation), there is no clinical evidence to support continuing antibiotics after the patient leaves the operating room. Prolonged use is considered "therapeutic" rather than "prophylactic" and is unnecessary for elective cases. **3. NEET-PG High-Yield Pearls:** * **Timing:** The most critical factor is that the antibiotic must be in the tissue *before* the incision. If Vancomycin or Fluoroquinolones are used, they should be started 120 minutes prior due to longer infusion times. * **Redosing:** A second dose is only indicated if the surgery lasts longer than two half-lives of the drug or if there is blood loss >1500 mL. * **Wound Classification:** * Clean: No prophylaxis (unless prosthetic used). * Clean-Contaminated: Single dose prophylaxis. * Contaminated/Dirty: Requires a full therapeutic course. * **Spillage:** If bile or stones are spilled during the procedure, the surgeon may choose to continue antibiotics, but for "no gross spillage," a single dose remains the gold standard.

Question 736: Which of the following statements is true concerning the vascular response to injury?

A. Vasoconstriction is an early event in the response to injury. (Correct Answer)
B. Vasodilatation is a detrimental response to injury with normal body processes working to avoid this process.
C. Vascular permeability is maintained to prevent further cellular injury.
D. Histamine, prostaglandin E2 (PGE2), and prostacyclin (PGI2) are important mediators of local vasoconstriction.

Explanation: ### Explanation **1. Why Option A is Correct:** Immediately following tissue injury, there is a transient period of **local vasoconstriction**. This is a protective physiological reflex mediated by neural mechanisms and local factors like **endothelin-1** and **thromboxane A2**. Its primary purpose is to minimize blood loss (hemostasis) and allow for the formation of a platelet plug. This phase is brief, typically lasting only a few minutes, before being superseded by vasodilation. **2. Why the Other Options are Incorrect:** * **Option B:** Vasodilation is **not detrimental**; it is a crucial part of the inflammatory response. It increases blood flow to the site of injury (hyperemia), which brings essential nutrients, oxygen, and inflammatory cells (leukocytes) to the area to begin the repair process. * **Option C:** Vascular permeability is **not maintained**; it is significantly **increased**. Endothelial cell contraction creates gaps that allow protein-rich fluid (exudate) and cells to move from the intravascular space into the interstitium. This is responsible for the classic sign of "tumor" (swelling). * **Option D:** Histamine, PGE2, and PGI2 are potent **vasodilators**, not vasoconstrictors. They act to relax vascular smooth muscle and increase blood flow during the later stages of the acute inflammatory response. **3. NEET-PG High-Yield Pearls:** * **Sequence of Vascular Events:** Transient Vasoconstriction → Persistent Vasodilation → Increased Permeability → Stasis → Leukocyte Margination. * **Triple Response of Lewis:** Induced by firm stroking of the skin: Red spot (capillary dilation), Flare (arteriolar dilation), and Wheal (exudation/edema). * **Key Mediator of Permeability:** Histamine is the primary mediator of the "immediate transient response" (15–30 mins) affecting venules. * **Starling’s Law:** Edema in injury is caused by increased hydrostatic pressure (due to vasodilation) and increased interstitial osmotic pressure (due to protein leakage).

Question 737: Which of the following is not recommended in the treatment of chronic low back pain?

A. NSAIDs
B. Bed rest for 3 months (Correct Answer)
C. Exercises
D. Epidural steroid injection

Explanation: **Explanation:** The management of chronic low back pain (defined as pain lasting >12 weeks) has shifted from passive to active recovery. **Bed rest for 3 months is contraindicated** because prolonged immobilization leads to muscle atrophy (especially of the multifidus and core stabilizers), joint stiffness, bone demineralization, and psychological distress. Current clinical guidelines recommend staying active; if bed rest is necessary for acute exacerbations, it should not exceed 2–3 days. **Analysis of Options:** * **NSAIDs (Option A):** These are the first-line pharmacological treatment for both acute and chronic low back pain to manage inflammation and provide symptomatic relief. * **Exercises (Option C):** Core strengthening, stretching, and aerobic conditioning are the cornerstones of chronic back pain management. They improve spinal stability, flexibility, and reduce the frequency of recurrences. * **Epidural Steroid Injection (Option D):** This is a recognized interventional modality, particularly when chronic pain is associated with radiculopathy (sciatica) or spinal stenosis, to reduce nerve root inflammation. **Clinical Pearls for NEET-PG:** * **The "Yellow Flags":** Psychosocial factors (e.g., depression, fear-avoidance behavior) are stronger predictors of chronicity than physical findings. * **Red Flags:** Always rule out "Red Flags" (cauda equina syndrome, malignancy, infection, or fractures) before starting conservative therapy. * **Imaging:** Routine imaging (X-ray/MRI) is **not** recommended for non-specific low back pain unless neurological deficits or red flags are present. * **First-line treatment:** Education, reassurance, and encouraging the patient to remain active.

Question 738: Which of the following is NOT a recognized type of inguinal hernia?

A. Hernia of the groin
B. Ventricular septal defect (Correct Answer)
C. Pantaloon hernia
D. Sliding hernia

Explanation: **Explanation:** The correct answer is **B. Ventricular septal defect**. This is a congenital cardiac anomaly involving a hole in the wall separating the lower chambers of the heart; it has no anatomical or physiological relation to the inguinal canal or abdominal wall hernias. **Analysis of Options:** * **Hernia of the groin (Option A):** This is a broad clinical category that encompasses inguinal (direct and indirect) and femoral hernias. It is the most common site for abdominal wall hernias. * **Pantaloon hernia (Option C):** Also known as a "Saddle-bag" hernia, this occurs when both a direct and an indirect inguinal hernia exist simultaneously on the same side, straddling the inferior epigastric vessels like a pair of pants. * **Sliding hernia (Option D):** Also known as *hernie en glissade*, this occurs when a retroperitoneal organ (commonly the cecum on the right or sigmoid colon on the left) forms part of the wall of the hernia sac. **High-Yield NEET-PG Pearls:** * **Indirect Inguinal Hernia:** The most common type in both males and females; it enters the deep inguinal ring lateral to the inferior epigastric artery. * **Direct Inguinal Hernia:** Occurs through Hesselbach’s triangle, medial to the inferior epigastric artery. * **Littre’s Hernia:** A hernia containing a Meckel’s diverticulum. * **Amyand’s Hernia:** An inguinal hernia containing the appendix. * **Richter’s Hernia:** Only a part of the circumference of the bowel wall is trapped, which can lead to strangulation without signs of intestinal obstruction.

Question 739: Which of the following is a characteristic feature of osteoarthritis?

A. Heberden node (Correct Answer)
B. Increased ESR
C. Onycholysis
D. Z deformity

Explanation: **Explanation:** **Osteoarthritis (OA)** is a degenerative joint disease characterized by the loss of articular cartilage and the formation of new bone at the joint margins (osteophytes). 1. **Heberden Nodes (Correct Answer):** These are palpable bony enlargements (osteophytes) located at the **Distal Interphalangeal (DIP) joints**. They are a hallmark clinical feature of primary OA. Similarly, involvement of the **Proximal Interphalangeal (PIP) joints** is known as **Bouchard nodes**. 2. **Increased ESR (Incorrect):** OA is primarily a non-inflammatory, degenerative condition. Therefore, systemic inflammatory markers like Erythrocyte Sedimentation Rate (ESR) and C-reactive protein (CRP) are typically **normal**. An elevated ESR suggests inflammatory arthritides like Rheumatoid Arthritis (RA) or systemic lupus erythematosus. 3. **Onycholysis (Incorrect):** This refers to the painless separation of the nail from the nail bed. It is a characteristic feature of **Psoriatic Arthritis**, not OA. 4. **Z-Deformity (Incorrect):** This is a classic deformity seen in **Rheumatoid Arthritis**, consisting of radial deviation at the wrist and ulnar deviation of the fingers. **High-Yield Clinical Pearls for NEET-PG:** * **Joint Involvement:** OA typically affects weight-bearing joints (hips, knees) and the first carpometacarpal (CMC) joint (squaring of the hand). * **Radiological Hallmarks (4):** Joint space narrowing, subchondral sclerosis, subchondral cysts, and osteophytes. * **Pain Pattern:** Pain worsens with activity and is relieved by rest (unlike RA, where morning stiffness lasts >1 hour and improves with activity). * **DIP vs. PIP:** Remember: **D**istal = **H**eberden (Alphabetical order D-H); **P**roximal = **B**ouchard (P-B).

Question 740: Which of the following is the least likely complication after massive blood transfusion?

A. Hyperkalemia
B. Citrate toxicity
C. Hypothermia
D. Metabolic acidosis (Correct Answer)

Explanation: ### Explanation **Massive Blood Transfusion (MBT)** is defined as the replacement of one total blood volume within 24 hours or >10 units of PRBCs in 24 hours. **Why Metabolic Acidosis is the Correct Answer:** While stored blood is acidic due to the accumulation of lactic acid and pyruvic acid, **metabolic alkalosis** (not acidosis) is the more common complication following MBT. This occurs because the **citrate** used as an anticoagulant in stored blood is metabolized by the liver into **bicarbonate**. While transient acidosis may occur initially due to the load of stored blood, the compensatory metabolic response leads to alkalosis in the post-transfusion period. **Analysis of Other Options:** * **Hyperkalemia:** Stored RBCs gradually leak potassium into the plasma over time (the "storage lesion"). Rapid infusion of older blood can lead to dangerous elevations in serum potassium. * **Citrate Toxicity (Hypocalcemia):** Citrate binds to free calcium in the recipient's blood. In massive transfusions, the liver cannot metabolize citrate fast enough, leading to a drop in ionized calcium levels, which can cause arrhythmias or tetany. * **Hypothermia:** Stored blood is kept at 4°C. Rapidly infusing large volumes of cold blood without using a commercial warmer leads to a drop in core body temperature, which can impair coagulation and cardiac function. **High-Yield Clinical Pearls for NEET-PG:** * **Most common acid-base abnormality:** Metabolic Alkalosis (due to citrate-to-bicarbonate conversion). * **Electrolyte shifts:** Hypocalcemia (most common), Hyperkalemia (common with old blood), and Hypomagnesemia. * **Coagulopathy:** Dilutional thrombocytopenia is the most common cause of bleeding after MBT. * **Shift in Oxygen Dissociation Curve:** Stored blood is deficient in **2,3-DPG**, causing a **Left Shift** (increased oxygen affinity, decreased delivery to tissues).

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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