General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 891: A central line is inserted into a patient for chemotherapy administration. What is the most appropriate position for the tip of the catheter?

A. Superior vena cava (Correct Answer)
B. Inferior vena cava
C. Pulmonary artery
D. Right atrium

Explanation: ***Superior vena cava*** - The **superior vena cava (SVC)** is the ideal placement for a central line tip, approximately at the junction of the SVC and the **right atrium**. - This position ensures rapid dilution of infusates, such as **chemotherapeutic agents**, minimizing vascular irritation and the risk of vein thrombosis or damage. *Pulmonary artery* - Advancing a central line into the **pulmonary artery** is typically done for **pulmonary artery catheterization** (e.g., Swan-Ganz catheter) to monitor hemodynamic pressures, not for routine chemotherapy. - Placement here would carry a significant risk of **pulmonary artery perforation** or obstruction. *Inferior vena cava* - The **inferior vena cava (IVC)** is accessed via lower extremity veins (e.g., femoral vein) and is not generally preferred for chemotherapy administration due to higher rates of **deep vein thrombosis** and less optimal dilution compared to SVC placement. - Catheter tips placed in the IVC are primarily for filters or infusions in patients with limited upper body access. *Right atrium* - While close to the SVC, positioning the catheter tip directly within the **right atrium** is generally avoided due to the risk of cardiac irritation, leading to **arrhythmias** or local damage. - The turbulent flow within the atrium can also contribute to **thrombus formation** around the catheter tip.

Question 892: During an appendectomy, the surgeon notices an abnormally positioned appendix. Which congenital condition could account for this finding?

A. Intestinal malrotation
B. Meckel's diverticulum
C. Situs inversus (Correct Answer)
D. Hirschsprung's disease

Explanation: ***Situs inversus*** - This condition involves the **mirror-image reversal** of all visceral organs, which would explain an abnormally positioned appendix. - In *situs inversus totalis*, the appendix (and cecum) would be located on the **left side of the abdomen** rather than the typical right lower quadrant. - This represents a **complete positional anomaly** affecting all abdominal organs systematically. *Intestinal malrotation* - This condition results from **incomplete rotation of the midgut** during embryonic development (normally 270° counterclockwise rotation). - Can indeed cause **abnormal cecal and appendix positioning** (e.g., subhepatic cecum), which is a recognized surgical finding. - However, the question context of "during appendectomy" discovering an abnormally positioned appendix suggests a **more dramatic positional anomaly** (such as left-sided location) rather than the variable cecal positions seen in malrotation. - More commonly presents with complications like **midgut volvulus** or Ladd's bands causing obstruction. *Meckel's diverticulum* - This is a **true diverticulum** of the small intestine (ileum), representing a remnant of the vitelline duct. - Located approximately **2 feet from the ileocecal valve** ("rule of 2s"). - While it can cause abdominal pathology (bleeding, inflammation, intussusception), it is a **separate structure** and does not affect appendix position. *Hirschsprung's disease* - Characterized by the **absence of ganglion cells** in the distal colon (aganglionosis), leading to functional obstruction. - This is a **neuromuscular motility disorder**, not an anatomical positional anomaly. - Does not cause an **ectopic appendix** or affect organ positioning.

Question 893: During a surgical procedure, the surgeon decides to close the wound with an absorbable suture. Which of the following suture materials is the most appropriate?

A. Vicryl (Correct Answer)
B. Nylon
C. Silk
D. Prolene

Explanation: ***Vicryl*** - **Vicryl** is a synthetic absorbable suture composed of **polyglactin 910**, known for its predictable absorption profile. - It maintains good tensile strength for several weeks and is completely hydrolyzed within **56-70 days**, making it suitable for internal closures where temporary support is needed. *Nylon* - **Nylon** (polyamide) is a **non-absorbable**, monofilament suture material known for its high tensile strength and minimal tissue reactivity. - It is primarily used for **skin closure** and other applications where permanent strength retention is desired, not for absorbable closure. *Silk* - **Silk** is a **non-absorbable**, braided natural fiber suture that causes a significant tissue reaction due to its proteinaceous nature. - Although it feels soft and handles well, its strength degrades over time and it is considered a **historical non-absorbable** rather than a predictably absorbable material. *Prolene* - **Prolene** (polypropylene) is a **non-absorbable**, monofilament suture with excellent tensile strength and very low tissue reactivity. - It is ideal for **vascular anastomoses** and permanent implants where long-term support and minimal inflammation are crucial, not for absorbable closure.

Question 894: In an abdominal surgery, which muscular layer is encountered immediately after the skin and subcutaneous tissue?

A. External oblique muscle (Correct Answer)
B. Internal oblique muscle
C. Transversus abdominis muscle
D. Transversalis fascia

Explanation: ***External oblique muscle*** - This is the **most superficial** of the three flat abdominal muscles, lying directly beneath the subcutaneous tissue. - Its fibers run **inferomedially**, contributing to abdominal wall strength and movement. *Internal oblique muscle* - This muscle lies **deep to the external oblique muscle**, with its fibers generally running superomedially. - It is encountered after passing through the external oblique layer. *Transversus abdominis muscle* - This is the **deepest** of the three flat abdominal muscles, lying beneath both the external and internal oblique muscles. - Its fibers run **transversely** across the abdomen, playing a key role in core stability. *Transversalis fascia* - The transversalis fascia is a **thin layer of connective tissue** that lies immediately deep to the transversus abdominis muscle, not a muscular layer itself. - It forms part of the posterior wall of the rectus sheath and is important for containing abdominal contents.

Question 895: Which procedure is typically performed to treat severe carpal tunnel syndrome?

A. Carpal tunnel release (Correct Answer)
B. Ulnar nerve transposition
C. Radial tunnel release
D. Flexor tendon repair

Explanation: ***Carpal tunnel release*** - This procedure involves **cutting the transverse carpal ligament** to relieve pressure on the median nerve. - It is the definitive surgical treatment for **severe carpal tunnel syndrome** when conservative measures fail. *Ulnar nerve transposition* - This procedure is performed to treat **cubital tunnel syndrome**, which involves compression of the ulnar nerve at the elbow. - It repositions the **ulnar nerve** to protect it from compression or stretching, rather than addressing carpal tunnel syndrome. *Radial tunnel release* - This surgery targets **radial tunnel syndrome**, a condition where the radial nerve is compressed in the forearm. - Symptoms typically involve **pain in the forearm** and elbow, not the hand and wrist numbness characteristic of carpal tunnel syndrome. *Flexor tendon repair* - This procedure is performed to **repair damaged or severed flexor tendons** in the hand or wrist. - It addresses injuries that impair finger movement but is unrelated to **nerve compression** in carpal tunnel syndrome.

Question 896: What is the primary treatment for a patient diagnosed with an incarcerated inguinal hernia that shows signs of strangulation?

A. Elective surgical repair
B. Manual reduction
C. Emergency surgical intervention (Correct Answer)
D. Observation and analgesia

Explanation: ***Emergency surgical intervention*** - An incarcerated inguinal hernia with signs of **strangulation** indicates compromised blood supply to the herniated tissue. This is a surgical emergency requiring immediate intervention to prevent **necrosis** and other life-threatening complications. - Delay in surgery for a **strangulated hernia** can lead to **bowel ischemia**, perforation, peritonitis, sepsis, and even death. *Elective surgical repair* - This is appropriate for **reducible** or **non-strangulated incarcerated hernias** without signs of ischemia. - Elective repair allows for patient optimization and scheduled surgery, avoiding the urgency and risks associated with emergency procedures. *Manual reduction* - Manual reduction may be attempted for an **incarcerated but non-strangulated hernia** to relieve symptoms and reduce the risk of strangulation. - However, in the presence of **strangulation signs**, it is contraindicated as it can push damaged, ischemic tissue back into the abdomen, leading to peritonitis and sepsis. *Observation and analgesia* - This approach is inappropriate and dangerous for a **strangulated hernia** because it does not address the underlying blood supply compromise. - Observing a strangulated hernia can lead to **irreversible tissue damage** and systemic complications, increasing morbidity and mortality.

Question 897: Which type of hernia is most likely to result in bowel strangulation?

A. Femoral hernia (Correct Answer)
B. Inguinal hernia
C. Umbilical hernia
D. Incisional hernia

Explanation: ***Femoral hernia*** - **Femoral hernias** have a higher risk of strangulation due to their **narrow neck** and rigid boundaries (inguinal ligament, Cooper's ligament, lacunar ligament). - The tight space through the femoral canal makes incarceration and subsequent strangulation more likely, leading to a compromise in blood supply. *Inguinal hernia* - While **inguinal hernias** are the most common type, their neck is generally wider than that of femoral hernias, leading to a lower proportionate risk of strangulation. - They can be either direct or indirect, with the latter passing through the deep inguinal ring and along the inguinal canal. *Umbilical hernia* - **Umbilical hernias** occur at the umbilicus and are common in infants, often resolving spontaneously. In adults, they are typically acquired. - They have a relatively wide defect, which makes strangulation less common compared to femoral hernias, although it can still occur, especially with larger defects. *Incisional hernia* - **Incisional hernias** develop at the site of a previous surgical incision, often due to inadequate wound healing or increased intra-abdominal pressure. - They typically have a wide defect, which reduces the likelihood of strangulation, though larger hernias can still incarcerate.

Question 898: Identify the surgical instrument based on its characteristics: a small, triangular blade used for precise incisions.

A. Blade no. 15
B. Blade no. 10
C. Blade no. 11 (Correct Answer)
D. Blade no. 12

Explanation: ***Blade no. 11*** - This blade has a **triangular shape** with a strong, pointed tip, making it ideal for **stab incisions** and precise, short cuts. - Its design allows for sharp, accurate penetration, often used in procedures requiring **minimal tissue disruption**. *Blade no. 15* - This is a small, curved blade, primarily used for **fine, precise cuts** in superficial tissues. - Its small size and rounded belly make it suitable for tasks like excising skin lesions or making incisions in delicate areas, not for triangular stab incisions. *Blade no. 10* - The No. 10 blade has a **large, curved cutting edge** and is generally used for making large incisions in skin and muscle. - It is not designed for precise, triangular stab incisions, but rather for broader, sweeping cuts. *Blade no. 12* - This blade is **sickle-shaped** with the cutting edge on the inside curve, used primarily for mucogingival surgery or removing sutures. - Its unique shape allows it to get into tight spaces and cut from a different angle, but it does not have a triangular tip for precise stab incisions.

Question 899: Which of the following statements is true about absorbable suture materials?

A. Degraded by enzymatic degradation (Correct Answer)
B. Made of synthetic material
C. Derived from natural materials (e.g., animal sources)
D. Not degraded (used in non-absorbable sutures)

Explanation: ***Degraded by enzymatic degradation*** - **Absorbable sutures** are designed to break down and be absorbed by the body over time. - This degradation primarily occurs through **enzymatic activity** for natural absorbable sutures (e.g., catgut) or **hydrolysis** for synthetic absorbable sutures (e.g., Vicryl, PDS). *Derived from natural materials (e.g., animal sources)* - While some absorbable sutures like **catgut** are indeed derived from natural animal sources, many common absorbable sutures (e.g., **Vicryl, PDS, Monocryl**) are **synthetic**. - Therefore, this statement is not universally true for *all* absorbable suture materials. *Made of synthetic material* - Similar to the previous option, many absorbable sutures are **synthetic**, but some well-known absorbable sutures, such as **catgut**, are **natural**. - This statement does not encompass the entire range of absorbable suture materials. *Not degraded (used in non-absorbable sutures)* - This statement describes the characteristic of **non-absorbable sutures**, which are designed to remain in the tissue permanently or until they are removed. - **Absorbable sutures**, by definition, are designed to be degraded and lose their tensile strength over time.

Question 900: Which of the following statements about the management of haematomas is NOT correct?

A. Haematoma must be operated. (Correct Answer)
B. Some haematomas require surgical intervention.
C. GCS assessment is helpful in prognosis.
D. CT scan is the investigation of choice for acute haemorrhage.

Explanation: ***Haematoma must be operated.*** - This statement is **incorrect** because not all hematomas require surgical intervention. - The decision to operate depends on **size**, **location**, **neurological status**, **mass effect**, and rate of expansion. - Small, asymptomatic hematomas can be managed **conservatively** with serial imaging and close neurological monitoring. - Absolute statements like "must be operated" are incorrect in clinical practice where individualized management is essential. *Some haematomas require surgical intervention.* - This statement is **correct** - many hematomas necessitate surgical evacuation. - Indications for surgery include: **significant mass effect**, **midline shift >5mm**, **neurological deterioration**, **large volume** (>30mL for SDH, >50mL for ICH), or **posterior fossa hematomas** causing brainstem compression. - Surgical intervention aims to relieve intracranial pressure and prevent secondary brain injury. *GCS assessment is helpful in prognosis.* - This statement is **correct** - the **Glasgow Coma Scale (GCS)** is a critical prognostic tool. - GCS is used to assess severity of neurological injury and predict outcomes in head trauma patients. - Lower GCS scores (≤8) indicate severe injury with poorer prognosis, while higher scores suggest better outcomes. - GCS also guides management decisions including need for intubation and intensive monitoring. *CT scan is the investigation of choice for acute haemorrhage.* - This statement is **correct** - **Non-contrast CT (NCCT)** is the gold standard for acute intracranial hemorrhage. - CT is rapid, widely available, and highly sensitive for detecting acute blood. - It helps identify location, size, mass effect, and associated injuries like skull fractures. - MRI has limited role in acute settings but is useful for subacute/chronic hemorrhage and detecting diffuse axonal injury.

Practice by Chapter

Wound Healing and Care

Practice Questions

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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