General Surgery Principles Practice Questions

Q: What is the most common site for pressure sores?

Ischium. **Explanation:** Pressure sores (decubitus ulcers) occur due to prolonged ischemia caused by external pressure exceeding capillary perfusion pressure (approximately 32 mmHg). The distribution of these ulcers depends heavily on the patient's position. **Why Ischium is correct:** The **ischial tuberosity** is the most common site for pressure sores overall. This is because the highest pressure intensities in the body are recorded over the ischium while in the **sitting position**. Since many patients at risk (such as those with paraplegia) spend significant time in wheelchairs, the ischium remains the most frequent site of involvement. **Analysis of Incorrect Options:** * **Sacrum:** This is the most common site for patients in the **supine (lying down) position**. While very frequent in hospital-bed-bound patients, statistically, the ischium leads in overall prevalence across all patient populations (including chronic wheelchair users). * **Greater Trochanter:** This is the most common site for patients in the **lateral decubitus (side-lying) position**. * **Heel:** This is a common site in supine patients, particularly those with peripheral vascular disease or diabetes, but it ranks lower in frequency than the sacrum or ischium. **High-Yield Clinical Pearls for NEET-PG:** * **Order of Frequency:** Ischium (24%) > Sacrum (23%) > Greater Trochanter (15%) > Heel (8%). * **Grading:** Pressure sores are classified into 4 stages (Stage I: Non-blanchable erythema; Stage IV: Full-thickness loss with exposed bone/tendon/muscle). * **Management:** The gold standard for prevention is frequent repositioning (every 2 hours). For surgical closure, **myocutaneous flaps** are preferred over skin grafts due to better padding and blood supply.

Q: Interparietal hernia at the level of the arcuate line and lateral border of the rectus is called?

Spigelian hernia. ### Explanation **Correct Answer: A. Spigelian hernia** A **Spigelian hernia** is a type of interparietal hernia that occurs through the **Spigelian fascia** (the aponeurosis of the transversus abdominis muscle). * **Anatomy:** It is bounded laterally by the **linea semilunaris** (lateral border of the rectus muscle) and medially by the rectus sheath. * **Location:** The vast majority occur at or below the **arcuate line** (Spigelian hernia belt), where the posterior rectus sheath is absent, creating a point of potential weakness. * **Mechanism:** It is "interparietal" because the hernial sac often dissects between the internal oblique and external oblique aponeurosis, making it difficult to diagnose on physical examination as there is often no obvious external bulge. **Analysis of Incorrect Options:** * **B. Lumbar hernia:** Occurs through the posterior abdominal wall in either the superior (Grynfelt-Lesshaft) or inferior (Petit) lumbar triangles. * **C. Richter’s hernia:** A specific type of hernia where only a **portion of the circumference** of the bowel wall is trapped. It does not refer to a specific anatomical location like the Spigelian fascia. * **D. Epigastric hernia:** Occurs through the **linea alba** in the midline, anywhere between the xiphoid process and the umbilicus. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Clinical diagnosis is difficult; **Ultrasound or CT scan** is the gold standard for confirmation. * **Risk of Strangulation:** High, due to the narrow, rigid neck of the defect. * **Treatment:** Surgical repair is always indicated (open or laparoscopic) because of the high risk of incarceration. * **Key Landmark:** The intersection of the arcuate line and the linea semilunaris is the most common site.

Q: Pseudoeschar formation is seen with which of the following agents?

Silver sulfadiazine. **Explanation:** **Silver sulfadiazine (SSD)** is the most commonly used topical antibacterial agent in burn care. Its hallmark clinical feature is the formation of a **pseudoeschar**—a thick, grayish-white, gelatinous layer formed by the interaction of the cream with wound exudate. Unlike a true eschar (dead tissue), a pseudoeschar can be easily debrided or washed away during dressing changes. **Analysis of Options:** * **Silver sulfadiazine (B):** Correct. It is painless, has broad-spectrum activity (including *Pseudomonas*), but its main drawback is the formation of pseudoeschar which can sometimes harbor bacteria if not cleaned properly. * **Silver Nitrate (A):** This agent does not form a pseudoeschar. Instead, it causes **black staining** of the skin and dressings. Its major clinical side effects are electrolyte imbalances (hyponatremia, hypochloremia) due to leaching. * **Mafenide acetate / Sulfamylon (C & D):** These are the same agent. Mafenide is highly effective for deep penetration (especially in ear burns/cartilage), but it is notorious for causing **metabolic acidosis** (via carbonic anhydrase inhibition) and pain on application. It does not form a pseudoeschar. **High-Yield Clinical Pearls for NEET-PG:** * **Silver Sulfadiazine:** Can cause transient **leukopenia** (neutropenia) within 2-3 days of therapy; it is contraindicated in patients with sulfa allergies and in newborns (risk of kernicterus). * **Mafenide Acetate:** The drug of choice for **burns over cartilage** and heavily colonized wounds due to its superior tissue penetration. * **Silver Nitrate (0.5%):** Known for causing "blackening" and potential methemoglobinemia.

Q: What is the best method to monitor intracranial pressure?

Intraventricular catheter. **Explanation:** Monitoring intracranial pressure (ICP) is critical in managing severe traumatic brain injury and neurosurgical emergencies. **Why Intraventricular Catheter is the Correct Answer:** The **Intraventricular Catheter (Ventriculostomy)** is considered the **Gold Standard** for ICP monitoring. Its primary advantage is that it allows for both accurate pressure measurement and **therapeutic drainage of cerebrospinal fluid (CSF)** to acutely lower ICP. It is calibrated against an external transducer, making it the most reliable and accurate method available. **Analysis of Incorrect Options:** * **Subarachnoid Bolt (Richmond Bolt):** This is less invasive than a ventricular catheter as it does not penetrate the brain parenchyma. However, it is prone to clogging with debris or brain tissue and cannot be used to drain CSF, making it less accurate and versatile. * **Intraparenchymal Catheter:** These use fiberoptic or strain-gauge technology. While they provide accurate pressure readings and are easy to insert, they are expensive, prone to "measurement drift" (loss of accuracy over time), and do not allow for CSF drainage. * **Epidural Catheter:** These are placed between the skull and the dura. They are the least invasive but also the **least accurate**, as the dura acts as a buffer, often leading to inconsistent readings. **NEET-PG High-Yield Pearls:** * **Normal ICP:** 5–15 mmHg. Treatment is usually initiated when ICP >20–22 mmHg. * **Cerebral Perfusion Pressure (CPP):** MAP – ICP. Goal is typically maintained between 60–70 mmHg. * **Reference Point:** For an intraventricular catheter, the transducer should be leveled at the **Foramen of Monro** (approximated by the external auditory meatus). * **Complication:** The most significant risk of an intraventricular catheter is **infection (ventriculitis)**.

Q: Cystic hygroma is best described as which of the following?

Lymphangioma. **Explanation:** **Cystic Hygroma** is a congenital malformation of the lymphatic system, specifically classified as a **macrocystic lymphangioma**. It occurs due to the failure of the primary lymphatic sacs to establish a connection with the venous system, leading to the sequestration of lymphatic tissue and subsequent cystic dilatation. * **Why Option A is correct:** Cystic hygroma is the most common type of lymphangioma. It typically presents at birth or by age two as a soft, painless, compressible, and brilliantly **transilluminant** mass, most commonly located in the posterior triangle of the neck. * **Why Option B is incorrect:** Hemangiomas are benign tumors of vascular endothelium (blood vessels), not lymphatics. While they can also present in infancy, they do not typically show the same degree of transillumination as cystic hygromas. * **Why Option C is incorrect:** Lymphatic obstruction following filariasis (caused by *Wuchereria bancrofti*) leads to acquired lymphedema or elephantiasis, not congenital cystic hygromas. * **Why Option D is incorrect:** Cystic hygromas are inherently **benign** lesions. However, they can be clinically challenging due to their tendency to infiltrate local structures (nerves and vessels) and potential for rapid enlargement if infected or if hemorrhage occurs within the cyst. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Left side of the neck (Posterior triangle). * **Pathognomonic sign:** Brilliantly transilluminant (due to clear serous fluid). * **Association:** Frequently associated with chromosomal anomalies like **Turner syndrome** and Down syndrome. * **Treatment of choice:** Surgical excision is preferred; however, **Sclerotherapy** (using agents like OK-432 or Bleomycin) is an effective alternative for large, unresectable lesions.

Q: Which of the following is NOT a feature of a pilonidal sinus?

Recurrence is uncommon. **Explanation:** **Pilonidal Sinus (PNS)** is a chronic inflammatory condition occurring in the natal cleft, primarily caused by the penetration of hair into the skin, leading to a foreign body reaction and track formation. **Why Option D is the correct answer:** Recurrence is actually a **hallmark characteristic** of pilonidal sinus disease. Recurrence rates are high (ranging from 10% to 40% depending on the surgical technique) due to factors like persistent hair growth, inadequate excision of tracks, presence of deep natal clefts, and poor postoperative hygiene. Therefore, the statement "Recurrence is uncommon" is false. **Analysis of Incorrect Options:** * **Option A:** PNS is most **common in young males** (late teens to 20s). This is attributed to thicker body hair, increased sweat production, and deeper natal clefts compared to females. * **Option B:** **Abscess formation** is the most common acute presentation. If the sinus track becomes infected and drainage is blocked, a painful pilonidal abscess develops, requiring incision and drainage. * **Option C:** The **Jack-knife (Kraske) position** is the standard surgical position. The patient is prone with hips flexed and buttocks taped apart to provide optimal exposure of the sacrococcygeal area. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Obesity, sedentary lifestyle ("Jeep Rider’s Disease"), and hirsutism. * **Pathogenesis:** It is an **acquired** condition (Karydakis theory), not congenital. * **Surgical Procedures:** * *Bascom’s Procedure:* For simple disease. * *Karydakis Flap/Limberg Flap:* Transposition flaps used to flatten the natal cleft and reduce recurrence. * **Primary Treatment:** Wide local excision with primary closure or healing by secondary intention.

Q: All are true about epigastric hernia except?

The most common structure herniating is omentum. **Explanation:** An epigastric hernia occurs through a defect in the **linea alba** between the xiphoid process and the umbilicus. **1. Why Option C is the Correct Answer (The "Except" statement):** Contrary to common belief, the most common content of an epigastric hernia is **extraperitoneal fat** (preperitoneal fat), not the omentum. The defect in the linea alba is usually very small (often less than 1 cm), which allows fat to protrude but is frequently too narrow for a peritoneal sac or omentum to enter. Therefore, the statement that omentum is the most common content is incorrect. **2. Analysis of Other Options:** * **Option A:** True. These hernias occur in the midline of the epigastrium. * **Option B:** True. Like most abdominal wall hernias, a cough impulse is typically present, though it may be difficult to elicit if the hernia is small, incarcerated, or composed of tense fat. * **Option D:** True. Epigastric hernias often present with localized pain and tenderness. Because of the location, the referred pain can mimic **peptic ulcer disease** or gallbladder disease, leading to diagnostic confusion. **Clinical Pearls for NEET-PG:** * **Gender Predominance:** More common in **males** (3:1 ratio), typically aged 20–50 years. * **Clinical Presentation:** Often presents as a small, painful lump. Pain is exacerbated by straining or coughing. * **Multiple Defects:** In about 20% of cases, multiple defects are present; always palpate the entire linea alba. * **Management:** They do not resolve spontaneously. Surgical repair (herniotomy and primary closure) is the treatment of choice.

Question 1

Foley catheter is used for:

Accepted Answer

Acute limb ischaemia

Answer

Suprapubic drainage

Answer

Cardiac angioplasty

Answer

Intraventricular drainage

Question 2

What is the most common site for pressure sores?

Accepted Answer

Ischium

Answer

Greater trochanter

Answer

Sacrum

Answer

Heel

Question 3

Interparietal hernia at the level of the arcuate line and lateral border of the rectus is called?

Accepted Answer

Spigelian hernia

Answer

Lumbar hernia

Answer

Richter’s hernia

Answer

Epigastric hernia

Question 4

Pseudoeschar formation is seen with which of the following agents?

Accepted Answer

Silver sulfadiazine

Answer

Silver Nitrate

Answer

Sulfamylon

Answer

Mafenide acetate

Question 5

What is the best method to monitor intracranial pressure?

Accepted Answer

Intraventricular catheter

Answer

Subarachnoid bolt

Answer

Intraparenchymal catheter

Answer

Epidural catheter

Question 6

Cystic hygroma is best described as which of the following?

Accepted Answer

Lymphangioma

Answer

Hemangioma

Answer

A condition that follows filariasis

Answer

Malignant

Question 7

Following an oral surgical procedure, the surgical site is covered with a gauze wetted with saline because:

Accepted Answer

Saline decreases the tendency of the clot to get embedded in gauze mesh.

Answer

Saline promotes local hemostasis at the site.

Answer

Saline has localized anti-inflammatory action.

Answer

Saline accelerates the healing of the wound.

Question 8

Which of the following is true about chronic wounds?

Accepted Answer

Found in diabetes mellitus

Answer

Always require surgical treatment

Answer

May be associated with vascular compromise

Answer

Monofilament sutures prevent infection

Question 9

Which of the following is NOT a feature of a pilonidal sinus?

Accepted Answer

Recurrence is uncommon

Answer

Common in young males

Answer

Abscess formation

Answer

Jack knife position is used for surgery

Question 10

All are true about epigastric hernia except?

Accepted Answer

The most common structure herniating is omentum

Answer

Contents bulge in the epigastric region

Answer

Cough impulse is positive

Answer

Can be confused with the pain of peptic ulcer

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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