General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 401: Non-bilious vomiting is typically seen in which of the following conditions?

A. Meconium ileus
B. Duodenal atresia
C. Hypertrophic pyloric stenosis (Correct Answer)
D. Necrotising enterocolitis

Explanation: **Explanation:** The key to distinguishing between types of pediatric intestinal obstruction lies in the anatomical relationship to the **Ampulla of Vater** (where the common bile duct enters the second part of the duodenum). **1. Why Hypertrophic Pyloric Stenosis (HPS) is correct:** In HPS, there is hypertrophy of the pyloric sphincter muscle, causing a functional gastric outlet obstruction. Because the obstruction is **proximal** to the Ampulla of Vater, the gastric contents (milk/formula) cannot mix with bile. Therefore, the hallmark clinical presentation is **non-bilious, projectile vomiting** in an infant typically aged 3–6 weeks. **2. Why the other options are incorrect:** * **Duodenal Atresia:** The obstruction most commonly occurs distal to the Ampulla of Vater. Thus, it typically presents with **bilious vomiting** within the first 24–48 hours of life. It is classically associated with the "double bubble" sign on X-ray. * **Meconium Ileus:** This is a distal small bowel obstruction (terminal ileum) often associated with Cystic Fibrosis. Since the blockage is far distal to the bile duct, the vomitus is **bilious**. * **Necrotising Enterocolitis (NEC):** This is an inflammatory/ischemic necrosis of the bowel. It presents with abdominal distension, bloody stools, and **bilious** gastric residuals or vomiting. **Clinical Pearls for NEET-PG:** * **Metabolic Profile in HPS:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria. * **Physical Exam:** A palpable "olive-shaped" mass in the epigastrium. * **Ultrasound (Investigation of Choice):** Look for pyloric muscle thickness >4mm and pyloric canal length >14mm. * **Treatment:** Ramstedt’s Pyloromyotomy (after correcting electrolyte imbalances).

Question 402: Chronic Burrowing ulcer is caused by which microorganism?

A. Microaerophilic streptococci (Correct Answer)
B. Peptostreptococcus
C. Streptococcus viridans
D. Streptococcus pyogenes

Explanation: **Explanation:** **Chronic Burrowing Ulcer**, also known as **Meleney’s Gangrene** (or Meleney’s synergistic gangrene), is a progressive, painful, and destructive ulceration of the skin and subcutaneous tissues. 1. **Why Microaerophilic Streptococci is correct:** The primary causative organism is **Microaerophilic non-hemolytic streptococci**. The pathogenesis is classically described as a **synergistic infection**. While the microaerophilic streptococci are the hallmark, they often act in synergy with other organisms like *Staphylococcus aureus* or enteric Gram-negative bacilli. The infection "burrows" into the subcutaneous fat, leading to extensive undermining of the skin edges, which is the clinical hallmark of this condition. 2. **Why the other options are incorrect:** * **Peptostreptococcus:** While this is an anaerobic organism found in various polymicrobial infections, it is not the specific primary agent classically associated with the description of Meleney’s burrowing ulcer. * **Streptococcus viridans:** These are alpha-hemolytic commensals of the oral cavity, primarily associated with dental caries and subacute bacterial endocarditis, not chronic skin ulceration. * **Streptococcus pyogenes:** This is the primary cause of **Necrotizing Fasciitis** (Type II) and Erysipelas. Unlike the chronic, slow-spreading nature of a burrowing ulcer, *S. pyogenes* causes acute, rapidly progressing, life-threatening infections. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Appearance:** Look for an ulcer with a "shaggy" base and significantly **undermined edges**. * **Location:** Often occurs post-operatively, especially after abdominal or thoracic surgery (near drain sites). * **Management:** Requires aggressive surgical debridement of the undermined skin and long-term antibiotics (Penicillin/Bacitracin). * **Distinction:** Do not confuse Meleney’s Ulcer (Chronic) with Fourniere’s Gangrene or Necrotizing Fasciitis (Acute/Fulminant).

Question 403: Which of the following is a laparoscopic technique in inguinal hernia mesh repair?

A. Lichtenstein
B. Stoppa
C. TEP (Correct Answer)
D. Desarda

Explanation: **Explanation:** In modern hernia surgery, techniques are broadly classified into **Open** and **Laparoscopic** repairs. The correct answer is **TEP (Totally Extraperitoneal)**, which is one of the two primary laparoscopic approaches for inguinal hernia repair. **1. Why TEP is correct:** TEP is a laparoscopic technique where the surgeon accesses the preperitoneal space without entering the peritoneal (abdominal) cavity. A mesh is placed to cover the entire myopectineal orifice of Fruchaud. Its main advantage is a lower risk of visceral injury compared to the TAPP (Transabdominal Preperitoneal) approach. **2. Why other options are incorrect:** * **Lichtenstein (Option A):** This is the "Gold Standard" for **open** tension-free mesh repair. It involves placing a polypropylene mesh over the inguinal floor via an anterior incision. * **Stoppa (Option B):** Also known as Giant Prosthetic Reinforcement of the Visceral Sac (GPRVS), this is an **open** posterior approach used primarily for complex or bilateral recurrent hernias. * **Desarda (Option C):** This is an **open** tissue-based (non-mesh) repair that uses a strip of the external oblique aponeurosis to strengthen the inguinal floor. **Clinical Pearls for NEET-PG:** * **TAPP vs. TEP:** TAPP involves entering the peritoneal cavity; TEP does not. * **Triangle of Doom:** Bound by the vas deferens and spermatic vessels; contains the **external iliac artery and vein**. Avoid tacking here. * **Triangle of Pain:** Bound by the spermatic vessels and iliopubic tract; contains the **femoral nerve, genitofemoral nerve (genital branch), and lateral cutaneous nerve of the thigh**. * **Nerve most commonly injured in Laparoscopic repair:** Lateral cutaneous nerve of the thigh (leading to meralgia paresthetica). * **Nerve most commonly injured in Open repair:** Ilioinguinal nerve.

Question 404: A 40-year-old female presents with fever, fatigue, and diffuse painful swelling in the midline of the neck. FNAC revealed epithelioid cells and giant cells. What is the most likely diagnosis?

A. Acute thyroiditis
B. Subacute thyroiditis (Correct Answer)
C. Tubercular lymphadenitis
D. Hashimoto's thyroiditis

Explanation: The clinical presentation of a **painful, diffuse midline neck swelling** (thyroid) associated with systemic symptoms like **fever and fatigue** is classic for **Subacute Thyroiditis (De Quervain’s Thyroiditis)**. [2] **Why Subacute Thyroiditis is correct:** This condition is typically post-viral. The hallmark histopathological finding on Fine Needle Aspiration Cytology (FNAC) is the presence of **multinucleated giant cells** and **epithelioid cells** forming "pseudo-tubercles" surrounding collapsed follicles. [2] Clinically, patients often present with a tender thyroid and an elevated ESR. **Why the other options are incorrect:** * **Acute Thyroiditis:** This is a bacterial infection (usually *S. aureus*). While it presents with fever and pain, FNAC would show **neutrophils and abscess formation**, not giant cells or epithelioid cells. * **Tubercular Lymphadenitis:** While this shows epithelioid cells and giant cells (caseating granulomas), the swelling is typically located in the **lateral neck (cervical lymph nodes)**, not as a diffuse midline thyroid swelling. * **Hashimoto’s Thyroiditis:** This is usually a **painless** goiter. [3] FNAC characteristically shows a dense **lymphocytic infiltrate** and **Hurthle cells** (Askanazy cells), not the giant cells seen in the subacute variety. [3][4] **NEET-PG High-Yield Pearls:** * **De Quervain’s** is the most common cause of a **painful** thyroid. [2] * **Lab findings:** High ESR, low TSH (initially), and characteristically **low radioactive iodine uptake (RAIU)** due to follicular destruction. [1] * **Treatment:** Primarily symptomatic with NSAIDs; steroids are used for severe pain. [2] It is usually self-limiting. [1]

Question 405: What is the current permissible maximum storage time and temperature for platelets?

A. 5 days at 1-6°C
B. 5 days at 20-24°C (Correct Answer)
C. 7 days at 22-24°C
D. 5 days at 25-27°C

Explanation: **Explanation** The correct answer is **B. 5 days at 20-24°C**. **1. Understanding the Concept** Platelets are unique compared to other blood components because they must be stored at **room temperature (20-24°C)** with **continuous agitation**. Agitation prevents platelet aggregation and maintains oxygen exchange, which is vital for preserving the "platelet storage lesion" (metabolic viability). If platelets are refrigerated (1-6°C), they undergo irreversible structural changes and are rapidly cleared by the liver upon transfusion, rendering them ineffective. The storage limit is capped at **5 days** primarily due to the high risk of bacterial proliferation at room temperature. **2. Analysis of Incorrect Options** * **Option A (1-6°C):** This is the storage temperature for Whole Blood and Packed Red Blood Cells (PRBCs). Cold temperatures cause platelet activation and dysfunction. * **Option C (7 days):** While some specialized bags or pathogen-reduction technologies (PRT) allow for 7-day storage in certain countries, the standard global and Indian (DGHS/NBTC) guideline remains 5 days to minimize sepsis risk. * **Option D (25-27°C):** This temperature is too high and exceeds the physiological range, accelerating bacterial growth and platelet degradation. **3. High-Yield Clinical Pearls for NEET-PG** * **Agitation:** Must be continuous (using a platelet agitator). * **Dose:** 1 unit of Random Donor Platelets (RDP) increases the count by **5,000–10,000/µL**; 1 unit of Single Donor Platelets (SDP) increases it by **30,000–60,000/µL**. * **Transfusion Trigger:** Usually <10,000/µL in stable patients or <50,000/µL if undergoing surgery. * **Complication:** Platelets have the **highest risk of bacterial contamination** among all blood products.

Question 406: Splenectomy is not useful as a mode of treatment in which of the following conditions?

A. Porphyria (Correct Answer)
B. Thalassemia
C. Hereditary spherocytosis
D. Sickle cell disease with large spleen

Explanation: **Explanation:** The primary indication for splenectomy in hematological disorders is to reduce the excessive destruction of red blood cells (extravascular hemolysis) or to manage complications like hypersplenism and massive infarcts. **Why Porphyria is the Correct Answer:** Porphyrias are a group of metabolic disorders caused by deficiencies in enzymes involved in **heme biosynthesis**. The pathology lies in the accumulation of toxic porphyrins in the liver, bone marrow, or skin. Unlike hemolytic anemias, the spleen does not play a significant role in the pathogenesis or progression of most porphyrias (with the rare exception of Congenital Erythropoietic Porphyria, where it is still not a primary treatment). Therefore, splenectomy offers no therapeutic benefit. **Why the other options are incorrect:** * **Hereditary Spherocytosis:** This is the **most common** indication for elective splenectomy. Removing the spleen prevents the destruction of spherical RBCs, effectively "curing" the anemia (though the red cell defect remains). * **Thalassemia:** Splenectomy is indicated in Thalassemia Major when there is evidence of **hypersplenism**, increasing transfusion requirements (>200 ml/kg/year), or painful splenomegaly. * **Sickle Cell Disease (SCD):** While most SCD patients undergo "autosplenectomy" due to repeated infarcts, a splenectomy is indicated in cases of **acute splenic sequestration crisis** or when a large, persistent spleen causes pain or hypersplenism. **High-Yield Clinical Pearls for NEET-PG:** * **Vaccination:** Post-splenectomy patients must be vaccinated against encapsulated organisms (*S. pneumoniae, H. influenzae, N. meningitidis*) ideally **2 weeks before** elective surgery or **2 weeks after** emergency surgery. * **Blood Picture:** Look for **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies on a peripheral smear post-splenectomy. * **OPSI:** Overwhelming Post-Splenectomy Infection (OPSI) is the most dreaded complication, most commonly caused by *Streptococcus pneumoniae*.

Question 407: Lord's plication is done for which condition?

A. Inguinal hernia
B. Testicular cancer
C. Hydrocele (Correct Answer)
D. Testicular varices

Explanation: **Explanation:** **Lord’s Plication** is a surgical procedure specifically used for the treatment of a **primary vaginal hydrocele**. The underlying principle of this surgery is the "plication" (folding and suturing) of the redundant tunica vaginalis. Unlike the Jaboulay’s procedure, which involves eversion of the sac, Lord’s plication involves multiple radiating mattress sutures that bunch up the sac margins. This technique is preferred for small to medium-sized thin-walled hydroceles as it minimizes dissection, thereby reducing the risk of postoperative hematoma and infection. **Analysis of Incorrect Options:** * **A. Inguinal Hernia:** Managed via herniotomy (in children) or lichenstein tension-free mesh repair (in adults). Lord’s procedure does not address the patent processus vaginalis or the abdominal wall defect. * **B. Testicular Cancer:** Requires a **Radical High Inguinal Orchidectomy**. Scrotal approaches (like Lord’s) are strictly contraindicated in suspected malignancy due to the risk of altering lymphatic drainage and causing local recurrence. * **D. Testicular Varices (Varicocele):** Treated via surgical ligation of the pampiniform plexus (e.g., Palomo’s or Ivanissevich procedure) or microsurgical subinguinal varicocelectomy. **Clinical Pearls for NEET-PG:** * **Jaboulay’s Procedure:** The gold standard for large, thick-walled hydroceles (involves eversion of the sac). * **Lord’s Procedure:** Best for thin-walled sacs; has the lowest incidence of postoperative hematoma. * **Hydrocele Fluid:** Typically amber-colored, rich in albumin and cholesterol. * **Transillumination Test:** The classic clinical sign used to differentiate a hydrocele (positive) from a hernia or solid tumor (negative).

Question 408: The triangle of pain is bordered by all of the following EXCEPT?

A. Iliopubic tract
B. Ductus deferens (Correct Answer)
C. Gonadal vessels
D. Reflected peritoneum

Explanation: The **Triangle of Pain** is a critical anatomical landmark during laparoscopic inguinal hernia repair (TEP/TAPP). It is an area of potential nerve injury that surgeons must avoid when placing tacks or mesh. ### Why "Ductus Deferens" is the Correct Answer The **ductus deferens** (vas deferens) is a boundary of the **Triangle of Doom**, not the Triangle of Pain. The Triangle of Doom is located medial to the gonadal vessels and contains the external iliac artery and vein. ### Boundaries of the Triangle of Pain The Triangle of Pain is located **lateral** to the gonadal vessels. Its boundaries are: * **Superomedial:** Gonadal vessels (Spermatic vessels). * **Superolateral:** Iliopubic tract. * **Inferior:** Reflected peritoneum (or the fold of the peritoneum). ### Clinical Significance & High-Yield Facts * **Contents:** This triangle contains the **Lateral femoral cutaneous nerve** (most commonly injured), the **Femoral branch of the genitofemoral nerve**, and the **Femoral nerve**. * **Clinical Pearl:** Tacking mesh in this zone can lead to chronic post-operative pain or paresthesia in the thigh. * **Comparison:** * **Triangle of Pain:** Lateral to gonadal vessels; contains nerves. * **Triangle of Doom:** Medial to gonadal vessels; contains major iliac vessels. * **Circle of Death:** A vascular circle formed by the anastomosis between the obturator artery and the inferior epigastric artery (Corona Mortis), which can lead to uncontrollable bleeding if injured.

Question 409: Infection of the index finger spreads to which space?

A. Mid-palmar space
B. Radial bursa
C. Thenar space (Correct Answer)
D. Dorsum of hand

Explanation: ### Explanation The hand contains potential fascial spaces that dictate the spread of infection. The correct answer is **Thenar space** due to the specific anatomical arrangement of the synovial sheaths and fascial planes. **1. Why Thenar Space is Correct:** The index finger is anatomically linked to the thenar space via its flexor tendon sheath. While the synovial sheath of the index finger usually ends at the level of the proximal palmar crease, infections that escape this sheath or involve the deep fascial planes of the index finger naturally track into the **thenar space** (located lateral to the mid-palmar septum). **2. Analysis of Incorrect Options:** * **Mid-palmar space:** This space receives infections from the **middle, ring, and little fingers**. It is separated from the thenar space by a strong fibrous septum attached to the third metacarpal bone. * **Radial bursa:** This is the proximal continuation of the synovial sheath of the **thumb** (pollicis longus). Infection of the thumb spreads here, not the index finger. * **Dorsum of hand:** This is a subcutaneous or subaponeurotic space. While infection can spread here via lymphatic drainage, the primary anatomical "space" for index finger infections remains the thenar space. **3. Clinical Pearls for NEET-PG:** * **Kanavel’s Signs:** Used to diagnose infectious tenosynovitis (Flexed posture, Fusiform swelling, Tenderness along the sheath, Pain on passive extension). * **Horseshoe Abscess:** Occurs when infection spreads from the **little finger (ulnar bursa)** to the **thumb (radial bursa)** or vice versa, as these bursae communicate in 80% of individuals. * **Space Boundaries:** The mid-palmar and thenar spaces are separated by the **mid-palmar septum** (attached to the 3rd metacarpal). * **Most common site of web space infection:** The second web space (due to its proximity to the index finger).

Question 410: What is true about Abdominal compartment syndrome?

A. Decreased Cardiac Output (Correct Answer)
B. Decreased Pulmonary capillary wedge pressure
C. Decreased Venous return
D. Decreased Systemic vascular resistance

Explanation: **Abdominal Compartment Syndrome (ACS)** is defined as sustained intra-abdominal pressure (IAP) >20 mmHg associated with new-onset organ dysfunction. It creates a "domino effect" on multiple organ systems due to increased pressure within the confined abdominal space. ### Why Option A is Correct: **Decreased Cardiac Output (CO)** is a hallmark of ACS. It occurs due to a combination of two factors: 1. **Reduced Stroke Volume:** Increased IAP compresses the Inferior Vena Cava (IVC), reducing venous return (preload). 2. **Increased Afterload:** High abdominal pressure is transmitted to the thoracic cavity and peripheral vasculature, increasing systemic resistance against which the heart must pump. ### Why Other Options are Incorrect: * **B. Decreased Pulmonary Capillary Wedge Pressure (PCWP):** In ACS, the diaphragm is pushed cranially, increasing intrathoracic pressure. This pressure is transmitted to the heart chambers, leading to **falsely elevated** PCWP and Central Venous Pressure (CVP) readings, despite an actual state of intravascular volume depletion. * **C. Decreased Venous Return:** While venous return *is* decreased, this is a **pathophysiological mechanism**, not the primary hemodynamic outcome usually tested in the context of "what is true regarding the systemic effect." However, in many competitive exams, if "Decreased CO" is present, it is the most definitive clinical consequence. *(Note: In some contexts, C is also physiologically true, but A is the standard clinical manifestation).* * **D. Decreased Systemic Vascular Resistance (SVR):** SVR is actually **increased** in ACS due to direct compression of the arterial tree and activation of the Renin-Angiotensin-Aldosterone System (RAAS) in response to decreased renal perfusion. ### High-Yield Clinical Pearls for NEET-PG: * **Gold Standard Diagnosis:** Measurement of **Intra-bladder pressure** (using a Foley catheter) is the surrogate marker for IAP. * **Renal Effect:** Oliguria is one of the earliest signs (occurs at IAP >15 mmHg) due to renal vein compression. * **Respiratory Effect:** Decreased lung compliance and hypercapnia (due to diaphragmatic elevation). * **Management:** Surgical decompression (Laparostomy) is the definitive treatment for refractory ACS.

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Wound Healing and Care

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Surgical Infections

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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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Evidence-Based Surgery

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