General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 311: What is the daily requirement of sodium in an adult?

A. 30-40 mM
B. 50-90 mM (Correct Answer)
C. 80-120 mM
D. 120-150 mM

Explanation: **Explanation:** The maintenance of fluid and electrolyte balance is a cornerstone of surgical care. In a healthy adult, the daily requirement for **Sodium (Na+) is approximately 1 to 1.5 mmol/kg/day**. For an average 60–70 kg adult, this translates to roughly **50–90 mmol/day** (often cited as 70–100 mmol in some texts). This amount is sufficient to cover obligatory losses through urine, sweat, and feces while maintaining plasma osmolality. **Analysis of Options:** * **Option B (50-90 mM):** This is the correct physiological range for maintenance. In clinical practice, this is typically provided by 1–2 liters of Normal Saline (0.9% NaCl contains 154 mmol/L) or balanced salt solutions. * **Option A (30-40 mM):** This is below the standard maintenance requirement for a healthy adult and may lead to hyponatremia if continued long-term without adequate intake. * **Option C & D (80-150 mM):** These ranges exceed the standard daily requirement. While the kidneys can usually excrete excess sodium, providing 120–150 mmol/day unnecessarily increases the risk of fluid overload and hypernatremia, especially in post-operative patients with increased ADH secretion. **High-Yield Clinical Pearls for NEET-PG:** * **Potassium (K+) Requirement:** 0.5–1 mmol/kg/day (approx. 40–60 mmol/day). * **Water Requirement:** 30–40 ml/kg/day (approx. 2–2.5 Liters/day). * **Caloric Requirement:** 25–30 kcal/kg/day. * **Post-operative Fluid Shift:** In the first 24–48 hours post-surgery, the body undergoes a "stress response," leading to sodium and water retention due to increased Aldosterone and ADH. Therefore, over-replacement of sodium during this period should be avoided to prevent pulmonary edema.

Question 312: Regarding pectus excavatum, all of the following are true except?

A. Gross cardiovascular system dysfunction (Correct Answer)
B. Decrease in lung capacity
C. Cosmetic deformity
D. Depression in the chest

Explanation: **Explanation:** **Pectus excavatum** (Funnel chest) is the most common congenital chest wall deformity, characterized by a posterior depression of the sternum and adjacent costal cartilages. **Why Option A is the Correct Answer (The "Except"):** While the heart is often displaced to the left and may show a "pancake" appearance on imaging, **gross cardiovascular dysfunction is rare**. Most patients are asymptomatic at rest. While some may experience a slight decrease in stroke volume or mitral valve prolapse during extreme exercise, they do not typically present with gross heart failure or significant hemodynamic instability. Therefore, stating they have "gross" dysfunction is clinically incorrect. **Analysis of Other Options:** * **B. Decrease in lung capacity:** The inward displacement of the sternum restricts the thoracic volume, leading to a **restrictive lung defect**. This results in a measurable decrease in total lung capacity and vital capacity. * **C. Cosmetic deformity:** This is the most common presenting complaint. The "sunken chest" appearance often leads to significant psychosocial distress and body image issues, especially in adolescents. * **D. Depression in the chest:** This is the hallmark anatomical feature of the condition, caused by the overgrowth of costal cartilages pushing the sternum inward. **High-Yield Clinical Pearls for NEET-PG:** * **Haller Index:** Used to assess severity via CT scan (Transverse diameter / Anteroposterior diameter). A score **>3.25** is considered severe and may require surgery. * **Surgical Procedures:** * **Ravitch Procedure:** Open repair involving cartilage resection. * **Nuss Procedure:** Minimally invasive repair using a retrosternal metal bar (current gold standard). * **Associated Conditions:** Frequently associated with Marfan syndrome and Ehlers-Danlos syndrome.

Question 313: A Denver shunt is used in which of the following conditions?

A. Ascites (Correct Answer)
B. Dialysis
C. Raised Intracranial pressure
D. Raised Intraocular pressure

Explanation: **Explanation:** A **Denver shunt** is a type of **peritoneovenous shunt (PVS)** designed to manage refractory ascites. It consists of a multi-perforated peritoneal catheter, a one-way valve housed in a compressible pump chamber, and a venous catheter that terminates in the internal jugular vein or superior vena cava. The underlying medical concept is the continuous drainage of ascitic fluid from the high-pressure peritoneal cavity into the low-pressure venous system. This helps maintain intravascular volume, improves renal blood flow, and reduces the need for frequent large-volume paracentesis. **Analysis of Options:** * **Option A (Correct):** Denver and LeVeen shunts are the two primary types of peritoneovenous shunts used for **refractory ascites** (often secondary to cirrhosis or malignancy). * **Option B (Incorrect):** Dialysis requires an Arteriovenous (AV) fistula, a graft, or a double-lumen venous catheter (e.g., Permcath), not a Denver shunt. * **Option C (Incorrect):** Raised intracranial pressure is managed by **Ventriculoperitoneal (VP) shunts**, which move fluid in the opposite direction (brain to peritoneum). * **Option D (Incorrect):** Raised intraocular pressure (glaucoma) is managed by pharmacological agents or aqueous shunt devices (e.g., Ahmed valve), which are micro-scale compared to a Denver shunt. **Clinical Pearls for NEET-PG:** * **Denver vs. LeVeen:** The Denver shunt has a **manual pump chamber** that can be percutaneously compressed to clear fibrin/clots, whereas the LeVeen shunt is entirely pressure-sensitive. * **Complications:** The most serious complication of peritoneovenous shunts is **Disseminated Intravascular Coagulation (DIC)**, caused by the sudden infusion of ascitic clotting factors into the systemic circulation. Other risks include shunt occlusion and "Sepsis." * **Current Status:** These shunts have largely been replaced by **TIPS** (Transjugular Intrahepatic Portosystemic Shunt) in modern practice.

Question 314: Morgagni hernia is defined as:

A. A hernia between the costal and sternal parts of the diaphragm. (Correct Answer)
B. A hernia through the pleuriperitoneal canal.
C. A hernia through the lumbar triangle.
D. A hernia through the inguinal canal.

Explanation: **Explanation:** **Morgagni Hernia** is a type of congenital diaphragmatic hernia (CDH) that occurs through the **Foramen of Morgagni**. This foramen is a retrosternal anatomical defect located between the **sternal and costal attachments** of the diaphragm. It is typically found on the right side (90% of cases) because the heart and pericardium provide protection on the left. **Analysis of Options:** * **Option A (Correct):** As described, the defect lies anteriorly between the xiphoid process (sternal part) and the ribs (costal part). It is often discovered incidentally in adults or presents with respiratory distress in children. * **Option B:** A hernia through the pleuroperitoneal canal is known as a **Bochdalek Hernia**. This is the most common type of CDH, occurs posterolaterally (usually on the left), and often presents with severe neonatal respiratory distress. * **Option C:** A hernia through the lumbar triangle (specifically the inferior lumbar triangle of Petit or superior triangle of Grynfeltt) is a **Lumbar Hernia**, which is a type of posterior abdominal wall hernia. * **Option D:** A hernia through the inguinal canal is an **Inguinal Hernia**, the most common type of abdominal wall hernia, unrelated to the diaphragm. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** **M**orgagni is **M**edial and **A**nterior; **B**ochdalek is **B**ack and **B**ig (more common/larger). * **Contents:** The most common content of a Morgagni hernia is the **omentum**, followed by the transverse colon. * **Radiology:** On a Chest X-ray, it appears as a radio-opaque mass in the **right cardiophrenic angle**. * **Surgical Note:** Unlike Bochdalek hernias, Morgagni hernias usually have a **true hernial sac**.

Question 315: Which of the following is a Nobel laureate?

A. Banker
B. William Halsted
C. Turek
D. Theodor Kocher (Correct Answer)

Explanation: **Theodor Kocher** is the correct answer as he was the first surgeon to receive the **Nobel Prize in Physiology or Medicine (1909)**. He was awarded this honor for his pioneering work on the physiology, pathology, and surgery of the **thyroid gland**. His meticulous surgical techniques significantly reduced the mortality rate of thyroidectomies and led to the discovery of the clinical features of hypothyroidism (cachexia strumipriva). **Analysis of Options:** * **Theodor Kocher (Correct):** Known as the "Father of Modern Abdominal Surgery," he is famous for **Kocher’s Maneuver** (mobilization of the duodenum) and **Kocher’s Incision** (subcostal incision for gallbladder surgery). * **William Halsted:** A legendary American surgeon who pioneered the residency training system, radical mastectomy, and the use of rubber gloves. Despite his massive contributions to surgery, he **never received a Nobel Prize**. * **Banker & Turek:** These names are not associated with Nobel-level contributions in the field of surgery. They do not represent major historical figures in the context of surgical Nobel laureates. **High-Yield Clinical Pearls for NEET-PG:** * **Kocher’s Maneuver:** Used to expose the retroperitoneal structures (pancreas, IVC, and distal CBD) by reflecting the duodenum and head of the pancreas medially. * **Kocher’s Point:** A common entry point for an external ventricular drain (EVD) into the frontal horn of the lateral ventricle. * **Other Surgical Nobel Laureates:** **Alexis Carrel** (1912, for vascular suture and organ transplantation) and **Joseph Murray** (1990, for the first successful human kidney transplant).

Question 316: Which of the following statements is true about hypertrophic scars?

A. They do not improve with time.
B. Flexor surfaces are usually affected. (Correct Answer)
C. They usually develop months after surgery.
D. The lesion overgrows its boundaries.

Explanation: ### Explanation Hypertrophic scars are a common topic in NEET-PG, often requiring differentiation from keloids. **Why Option B is Correct:** Hypertrophic scars are characterized by an overabundance of collagen within the boundaries of the original wound. They are strongly associated with **tension** across the wound. **Flexor surfaces** (such as the front of the elbow or behind the knee) are frequently affected because the constant movement and stretching across these joints create high mechanical tension, stimulating fibroblasts to produce excess collagen. **Analysis of Incorrect Options:** * **Option A:** Unlike keloids, hypertrophic scars **do improve with time**. They often undergo a "maturation" phase where they become flatter, softer, and paler over 6 to 18 months. * **Option C:** Hypertrophic scars typically develop **early** (usually within 4 weeks) after the initial injury or surgery. In contrast, keloids may appear several months or even years later. * **Option D:** This is the classic definition of a **keloid**. Hypertrophic scars stay **within the boundaries** of the original wound, whereas keloids invade the surrounding healthy tissue. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Both contain collagen, but hypertrophic scars have organized **parallel bundles** of Type III collagen, while keloids have thick, **disorganized (whorled)** bundles of Type I and III collagen. * **Site Predilection:** Keloids favor the "Keloid Triangle" (pre-sternal area, deltoid, and upper back/earlobes). Hypertrophic scars occur anywhere there is high tension (flexor surfaces). * **Treatment:** First-line treatment for both includes **intralesional triamcinolone** (steroids) and silicone gel sheeting. Pressure garments are also effective for hypertrophic scars.

Question 317: What is true about incisional hernia?

A. Not seen post-laparoscopic procedures
B. Strangulation is common
C. Multiple defects may be seen within the same scar (Correct Answer)
D. Mesh is not recommended in repair

Explanation: **Explanation:** An **incisional hernia** occurs due to the protrusion of abdominal contents through a previously healed surgical scar. It is a common complication, occurring in approximately 10–15% of laparotomy incisions. **Why Option C is Correct:** Incisional hernias are often characterized by a "Swiss-cheese" appearance. The scar tissue may weaken at multiple points along the length of the incision, leading to **multiple distinct fascial defects** within the same scar. This is a critical surgical consideration, as missing a secondary defect during repair leads to early recurrence. **Analysis of Incorrect Options:** * **Option A:** While the incidence is lower compared to open surgery, incisional hernias **can occur** after laparoscopic procedures, typically at the **10mm or larger trocar sites** (Port-site hernia). * **Option B:** Strangulation is **uncommon** in incisional hernias because the defect is usually large and the neck is wide. While incarceration can occur, the risk of vascular compromise (strangulation) is lower than in femoral or indirect inguinal hernias. * **Option D:** **Mesh repair (Hernioplasty)** is the gold standard. Simple suture repair (Herniorrhaphy) has a high recurrence rate (up to 30-50%). Mesh provides a tension-free repair, significantly reducing recurrence. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Wound infection (the single most important local factor). * **Risk Factors:** Obesity, malnutrition, chronic cough (increased intra-abdominal pressure), and smoking. * **Management:** Laparoscopic IPOM (Intraperitoneal Onlay Mesh) or open sublay/preperitoneal mesh repair are preferred techniques. * **Timing:** Most incisional hernias appear within the first 1–2 years after surgery.

Question 318: Which one of the following cases is considered a clean contaminated wound?

A. Open cholecystectomy for cholelithiasis (Correct Answer)
B. Herniorrhaphy with mesh repair
C. Lumpectomy with axillary node dissection
D. Gunshot wound to the abdomen with injuries to the small bowel

Explanation: ### Explanation The classification of surgical wounds is a high-yield topic for NEET-PG, based on the **CDC Surgical Wound Classification** system which predicts the risk of postoperative surgical site infection (SSI). **1. Why Option A is Correct:** **Open cholecystectomy for cholelithiasis** is classified as a **Clean-Contaminated (Class II)** wound. These are operative wounds 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 if there is no evidence of infection (cholecystitis) and no major break in technique, it remains Class II. **2. Analysis of Incorrect Options:** * **Option B (Herniorrhaphy with mesh repair):** This is a **Clean (Class I)** wound. It is an elective procedure, primarily closed, where no hollow viscus is entered and no inflammation is present. * **Option C (Lumpectomy with axillary node dissection):** This is also a **Clean (Class I)** wound. The surgery involves skin and soft tissue without entering the respiratory or GI tracts. * **Option D (Gunshot wound with small bowel injury):** This is a **Contaminated (Class III)** wound. Traumatic wounds less than 4 hours old or surgeries with a major break in sterile technique or gross spillage from the GI tract fall into this category. (If the wound is >4 hours old or involves fecal contamination, it becomes **Dirty/Class IV**). **3. Clinical Pearls for NEET-PG:** * **Clean (Class I):** No inflammation; no tracts entered. SSI risk: <2%. * **Clean-Contaminated (Class II):** Tracts entered under controlled conditions. SSI risk: <10%. * **Contaminated (Class III):** Accidental wounds, gross GI spill, or acute non-purulent inflammation. SSI risk: 15-20%. * **Dirty (Class IV):** Established infection (pus), perforated viscera, or old traumatic wounds with retained devitalized tissue. SSI risk: up to 40%.

Question 319: A Maylard incision involves a transverse cut through which of the following muscles?

A. Rectus abdominis (Correct Answer)
B. Serratus anterior
C. Pectoralis major
D. Psoas major

Explanation: **Explanation:** The **Maylard incision** is a transverse muscle-cutting incision used primarily in pelvic and gynecological surgeries to provide excellent exposure to the pelvic organs. 1. **Why Rectus Abdominis is correct:** Unlike the Pfannenstiel incision (which is muscle-splitting), the Maylard incision involves a **transverse division of the rectus abdominis muscles** across their entire width. To prevent retraction of the muscle bellies, the rectus muscles are often ligated to the overlying anterior rectus sheath or the underlying inferior epigastric vessels are secured before transection. This provides a wider operative field than a standard Pfannenstiel incision. 2. **Why other options are incorrect:** * **Serratus anterior:** Located on the lateral thoracic wall; involved in thoracotomy or axillary dissections, not pelvic incisions. * **Pectoralis major:** A chest wall muscle; involved in breast surgery or thoracic access. * **Psoas major:** A deep posterior abdominal wall muscle; it is never electively transected for abdominal access. **High-Yield Clinical Pearls for NEET-PG:** * **Pfannenstiel Incision:** Transverse skin incision, but the rectus muscles are **separated vertically** (muscle-splitting) at the linea alba. * **Cherney Incision:** Transverse incision where the rectus abdominis tendons are **detached from the pubic symphysis** rather than being cut through the muscle belly. * **Vascular Caution:** In a Maylard incision, the **inferior epigastric arteries** must be identified and ligated because they run lateral to the rectus muscles and are at risk during the transverse cut. * **Indication:** Preferred when more lateral pelvic exposure is needed (e.g., radical hysterectomy or staging laparotomy).

Question 320: All of the following statements regarding neck dissection are true EXCEPT:

A. Central compartment neck dissection involves removal of level VI lymph nodes.
B. Supraomohyoid neck dissection involves removal of level I-III lymph nodes.
C. Type II Modified Radical Neck Dissection (MRND) preserves both the spinal accessory nerve and the sternocleidomastoid muscle. (Correct Answer)
D. Lateral neck dissection involves the removal of lymph nodes in levels II-V along with the internal jugular vein.

Explanation: ### Explanation The correct answer is **C** because it incorrectly describes the structures preserved in a Type II Modified Radical Neck Dissection (MRND). #### 1. Understanding Modified Radical Neck Dissection (MRND) MRND involves the removal of lymph node levels I–V, similar to a Radical Neck Dissection (RND), but with the preservation of one or more non-lymphatic structures: the **Spinal Accessory Nerve (SAN)**, the **Internal Jugular Vein (IJV)**, and the **Sternocleidomastoid Muscle (SCM)**. The classification is as follows: * **Type I:** Preserves the **SAN** only. * **Type II:** Preserves the **SAN** and the **IJV**. (Option C is false because it claims the SCM is preserved instead of the IJV). * **Type III (Functional Neck Dissection):** Preserves all three (SAN, IJV, and SCM). #### 2. Analysis of Other Options * **Option A:** True. The **Central Compartment** (Level VI) includes the pretracheal, paratracheal, and precricoid (Delphian) nodes. * **Option B:** True. **Supraomohyoid Neck Dissection** is a selective neck dissection (SND) typically performed for oral cavity cancers, involving levels **I, II, and III**. * **Option D:** True. **Lateral Neck Dissection** involves levels **II–IV or II–V**. While the term is sometimes used for selective dissections, in the context of thyroid cancer or specific protocols, it involves removing these levels while potentially sacrificing or preserving the IJV depending on the extent of disease. #### Clinical Pearls for NEET-PG * **Radical Neck Dissection (RND):** Removes levels I–V + SAN + IJV + SCM. * **Most commonly sacrificed structure in MRND Type I:** Spinal Accessory Nerve is the most important to *save* to prevent "Shoulder Syndrome" (shoulder drop and pain). * **Level VI boundaries:** Hyoid bone (superior), Suprasternal notch (inferior), and Carotid arteries (lateral). * **Sentinel Node in Oral Cancer:** Usually found in Level I or II.

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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