General Surgery Principles Practice Questions

Q: What is the tensile strength of a wound scar compared to normal skin?

Approximately 80% of normal skin. ### Explanation The tensile strength of a wound is a measure of its capacity to resist rupture under tension. This process is governed by the synthesis, cross-linking, and remodeling of collagen. **Why Option C is Correct:** Wound healing occurs in phases: inflammatory, proliferative, and remodeling. During the **remodeling phase** (starting at 3 weeks and lasting up to a year), Type III collagen is replaced by stronger **Type I collagen**, and fibers are reorganized along lines of tension. Despite this maturation, a healed scar never regains the full structural integrity of unwounded skin. It reaches approximately **80% of the original tensile strength** by the end of 3 months, which is considered its ultimate plateau. **Why Other Options are Incorrect:** * **Option A & B:** A scar is functionally inferior to normal skin. The lack of identical basket-weave collagen architecture and the absence of elastic fibers mean it can never be "similar to" or "more than" normal skin. * **Option D:** While tensile strength is approximately 50% at 4–5 weeks, the question asks for the final strength of a "wound scar" (implying a matured state), which reaches the 80% mark. **NEET-PG High-Yield Pearls:** * **Timeline of Strength:** * **End of 1st week:** 3% (Sutures are the only strength). * **End of 3rd week:** 20% (Rapid increase due to collagen cross-linking). * **End of 3rd month:** 80% (Plateau phase). * **Collagen Shift:** Healing begins with **Type III collagen** (granulation tissue) and matures into **Type I collagen** (scar tissue). * **Vitamin C** is a crucial cofactor for the hydroxylation of proline and lysine; deficiency leads to poor tensile strength and wound dehiscence.

Q: Which of the following statements is true regarding a paramedian incision?

The rectus sheath is cut medially.. **Explanation:** The **paramedian incision** is a vertical incision made approximately 2–5 cm lateral to the midline. Its primary advantage is that it creates a "valve-like" closure, which reduces the risk of incisional hernia compared to a midline incision. **Why Option C is correct:** In a paramedian incision, the anterior rectus sheath is divided vertically. The **rectus muscle is then retracted laterally**. To access the posterior rectus sheath and peritoneum, the incision must be made **medially** (near the linea alba). By retracting the muscle laterally, the nerve supply (which enters the muscle from the lateral side) is preserved, and the muscle acts as a biological barrier over the wound once it returns to its original position. **Why other options are incorrect:** * **Option A:** A paramedian incision can be performed both **above and below** the umbilicus, depending on the organ being accessed (e.g., gallbladder vs. sigmoid colon). * **Option B:** If the rectus sheath were cut laterally or the muscle retracted medially, the **intercostal nerves** entering the lateral border of the rectus muscle would be severed, leading to muscle atrophy. * **Option D:** Because the nerves are preserved by lateral retraction, there is **no loss of sensation or motor function** in the rectus muscle. **High-Yield NEET-PG Pearls:** * **Nerve Preservation:** The paramedian incision is "physiologic" because it avoids denervating the rectus muscle. * **Incisional Hernia:** It has a lower rate of incisional hernia compared to midline incisions but takes longer to perform and close. * **Battle’s Incision:** A variation (lateral paramedian) where the muscle is retracted medially; this is rarely used now as it risks denervating the medial portion of the muscle.

Q: Who first introduced antiseptic technique in surgery?

Joseph Lister. **Explanation:** **Joseph Lister (Option A)** is known as the **"Father of Antiseptic Surgery."** Inspired by Louis Pasteur’s germ theory, Lister hypothesized that microorganisms caused wound infections. In 1865, he introduced the use of **Carbolic acid (Phenol)** to clean surgical instruments and wounds, significantly reducing post-operative mortality from gangrene and sepsis. This shift from "cleanliness" to "antisepsis" revolutionized modern surgery. **Analysis of Incorrect Options:** * **Louis Pasteur (Option B):** Known as the "Father of Microbiology," he proposed the **Germ Theory of Disease** and developed the process of pasteurization. While his work provided the scientific foundation for Lister’s techniques, Pasteur himself was not a surgeon and did not introduce surgical antisepsis. * **Robert Koch (Option C):** A pioneer in bacteriology, he formulated **Koch’s Postulates** to link specific microbes to specific diseases (e.g., Anthrax, TB, Cholera). He later advocated for **asepsis** (steam sterilization) over Lister’s chemical antisepsis. * **Antony Van Leeuwenhoek (Option D):** Known as the "Father of Microbiology," he was the first to observe and describe microorganisms ("animalcules") using a handcrafted microscope in the 17th century. **High-Yield Clinical Pearls for NEET-PG:** * **Antisepsis vs. Asepsis:** Lister pioneered *Antisepsis* (killing germs on living tissue/wounds), while **Ernst von Bergmann** introduced *Asepsis* (preventing germs from entering the surgical field via steam sterilization/autoclaving). * **Ignaz Semmelweis:** Often called the "Father of Handwashing," he advocated for hand disinfection with chlorinated lime to prevent puerperal fever before Lister’s era. * **William Halsted:** Introduced the use of rubber gloves in surgery (initially to protect his nurse’s hands from Lister’s harsh carbolic acid).

Q: A mediastinoscope can visualize all of the following lymph nodes except?

Aortopulmonary window lymph node. **Explanation:** Mediastinoscopy is a surgical procedure used primarily for the staging of lung cancer and diagnosing mediastinal lymphadenopathy. The scope is inserted through a pretracheal plane (behind the major vessels but in front of the trachea), which dictates which nodes are accessible. **1. Why Option B is Correct:** The **Aortopulmonary (AP) window lymph nodes (Station 5)** and **Para-aortic nodes (Station 6)** are located lateral to the aortic arch and the ligamentum arteriosum. Because the mediastinoscope stays in the midline/paratracheal plane, it cannot reach these lateral structures. To visualize the AP window, a **Video-Assisted Thoracoscopic Surgery (VATS)** or a **Chamberlain procedure (Anterior Mediastinotomy)** is required. **2. Why Incorrect Options are Wrong:** * **Right paratracheal (Station 4R) and Left paratracheal (Station 4L):** These are the primary targets of cervical mediastinoscopy as they lie directly adjacent to the trachea. * **Anterior tracheal (Station 2):** These are easily accessible as the scope passes directly over the anterior surface of the trachea. * **Subcarinal (Station 7):** By following the trachea down to the bifurcation (carina), the surgeon can access the nodes located immediately below it. **Clinical Pearls for NEET-PG:** * **Standard Mediastinoscopy** can access Stations 1, 2, 3, 4, and 7. * **Chamberlain Procedure:** Specifically used for Station 5 (AP window) and Station 6 (Para-aortic) nodes. * **Complication:** The most common serious complication of mediastinoscopy is hemorrhage, usually from the **Innominate artery** or **Azygos vein**. * **Contraindication:** Previous mediastinoscopy (due to scarring/adhesions) is a relative contraindication.

Q: What is the most common location for a Morgagni hernia?

Right anterior. **Explanation:** **Morgagni hernia** is a type of congenital diaphragmatic hernia (CDH) that occurs through the **Foramen of Morgagni**. This is an anterior defect in the diaphragm located between the sternal and costal attachments. 1. **Why Right Anterior is Correct:** The Foramen of Morgagni is a retrosternal/parasternal space. While the potential space exists on both sides, **90% of Morgagni hernias occur on the right side.** This is because the left side is anatomically protected by the **pericardial attachments** and the heart, which provide a physical barrier against herniation. Therefore, the right anterior position is the most common site. 2. **Why Other Options are Incorrect:** * **Right/Left Posterior:** Posterior diaphragmatic defects are associated with **Bochdalek hernias** (the most common type of CDH overall). Remember the mnemonic: **B**ochdalek is **B**ack (Posterior). * **Left Anterior:** While Morgagni hernias can occur on the left, they are rare (approx. 2-5%) due to the protective presence of the heart and pericardium. **High-Yield Clinical Pearls for NEET-PG:** * **Morgagni vs. Bochdalek:** Bochdalek is posterior (most common CDH overall, usually left-sided); Morgagni is anterior (less common, usually right-sided). * **Contents:** The most common organ to herniate in a Morgagni hernia is the **liver**, followed by the omentum and colon. * **Presentation:** Unlike Bochdalek hernias, which present with neonatal respiratory distress, Morgagni hernias are often **asymptomatic** in childhood and are frequently discovered incidentally on chest X-rays in adults. * **Radiology:** On a lateral chest X-ray, Morgagni hernia appears as a mass in the **anterior cardiophrenic angle**.

Q: Which intravenous catheter size is preferred in a patient with severe dehydration?

18G. In a patient with severe dehydration, the primary clinical goal is rapid volume expansion to restore intravascular volume and prevent hypovolemic shock. **Why 18G is the Correct Answer:** The rate of fluid resuscitation is governed by **Poiseuille’s Law**, which states that the flow rate of a fluid is directly proportional to the fourth power of the radius of the catheter and inversely proportional to its length. Therefore, a larger internal diameter (smaller gauge number) allows for significantly faster flow. An **18G (Green)** catheter is considered a "large-bore" cannula capable of delivering approximately 90–100 mL/min, making it the standard choice for rapid fluid replacement in dehydrated adults or surgical patients. **Analysis of Incorrect Options:** * **24G (Yellow):** This is a very fine-bore catheter (approx. 20 mL/min) primarily used in neonates or for very fragile veins. It is inadequate for rapid fluid resuscitation. * **22G (Blue):** Used for older children or adults with difficult venous access. The flow rate (approx. 35 mL/min) is too slow for severe dehydration. * **20G (Pink):** A common "all-purpose" cannula (approx. 60 mL/min). While used for maintenance fluids, it is less efficient than an 18G when rapid boluses are required. **Clinical Pearls for NEET-PG:** * **The "Short and Thick" Rule:** For the fastest resuscitation, use the shortest and widest catheter possible. * **Trauma Protocol:** In trauma or massive hemorrhage, even larger bores like **14G (Orange)** or **16G (Grey)** are preferred. * **Color Coding Memory Aid:** * 14G: Orange (Largest) * 16G: Grey * 18G: Green (Standard for blood/rapid fluids) * 20G: Pink * 22G: Blue * 24G: Yellow (Smallest)

Question 1

What is the tensile strength of a wound scar compared to normal skin?

Accepted Answer

Approximately 80% of normal skin

Answer

Similar to normal skin

Answer

More than normal skin

Answer

Approximately 50% of normal skin

Question 2

Which of the following statements is true regarding a paramedian incision?

Accepted Answer

The rectus sheath is cut medially.

Answer

It is done below the umbilicus.

Answer

The rectus sheath is cut laterally.

Answer

It decreases sensation in the rectus muscle.

Question 3

Who first introduced antiseptic technique in surgery?

Accepted Answer

Joseph Lister

Answer

Louis Pasteur

Answer

Robert Koch

Answer

Antony Van Leeuwenhoek

Question 4

Which of the following statements regarding direct inguinal hernia is true?

Accepted Answer

A direct hernia is medial to the inferior epigastric artery.

Answer

It is the most common direct inguinal hernia in women.

Answer

Repair involves the transversalis fascia and the internal ring.

Answer

It typically descends downwards and inwards towards the scrotum.

Question 5

A mediastinoscope can visualize all of the following lymph nodes except?

Accepted Answer

Aortopulmonary window lymph node

Answer

Right paratracheal lymph node

Answer

Anterior tracheal lymph node

Answer

Subcarinal lymph node

Question 6

The occurrence of hypothyroidism following administration of supplemental iodine to subjects with endemic iodine deficiency goiter is known as:

Accepted Answer

Wolff-Chaikoff effect

Answer

Jod-Basedow effect

Answer

Rafetoff Syndrome

Answer

Pendred Syndrome

Question 7

What is the most common site for a hypertrophic keloid?

Accepted Answer

Presternal area

Answer

Face

Answer

Leg

Answer

Arm

Question 8

What is the most common location for a Morgagni hernia?

Accepted Answer

Right anterior

Answer

Right posterior

Answer

Left anterior

Answer

Left posterior

Question 9

A chronic wound may be defined as one that fails to heal by what duration?

Accepted Answer

3 weeks

Answer

1 week

Answer

2 weeks

Answer

4 weeks

Question 10

Which intravenous catheter size is preferred in a patient with severe dehydration?

Accepted Answer

18G

Answer

24G

Answer

22G

Answer

20G

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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