General Surgery Principles Practice Questions

Q: Gut suturing material is absorbed by which process?

Hydrolysis. **Explanation:** Suture materials are classified based on their absorption profile. The mechanism of absorption depends entirely on whether the suture is **natural** or **synthetic**. **Why Hydrolysis is Correct:** Modern synthetic absorbable sutures (e.g., **Vicryl/Polyglactin 910, Monocryl, PDS**) are broken down by **Hydrolysis**. This is a non-enzymatic process where water molecules penetrate the polymer chains, causing them to fragment. This process is predictable and causes minimal tissue reaction, making it the preferred mechanism for most surgical procedures. **Analysis of Incorrect Options:** * **Proteolysis (Option D):** This is the mechanism for **Natural** absorbable sutures (e.g., **Surgical Catgut**). Catgut is derived from bovine or ovine intestinal submucosa/serosa. Being a foreign protein, it is degraded by lysosomal enzymes from inflammatory cells (proteolysis). This process is unpredictable and causes significant tissue inflammation. * **Oxidation (Option A):** This is not a standard mechanism for suture degradation. While some materials may undergo oxidative stress in the body, it is not the primary mode of absorption for surgical gut or synthetic sutures. * **Fibrinolysis (Option C):** This refers to the breakdown of fibrin clots in the blood coagulation cascade and is unrelated to the degradation of suture polymers. **NEET-PG High-Yield Pearls:** * **Fastest Absorption:** Plain Catgut (loses strength in 7-10 days). * **Longest Strength Retention:** PDS (Polydioxanone) – ideal for slow-healing tissues like fascia. * **Vicryl (Polyglactin 910):** A braided synthetic suture absorbed by hydrolysis; it is the most commonly used suture in general surgery. * **Key Distinction:** Natural = Proteolysis (High inflammation); Synthetic = Hydrolysis (Low inflammation).

Q: Petersen hernia is defined as:

An internal hernia located behind the Roux-en-Y limb. **Explanation:** **Petersen’s Hernia** is a type of internal hernia that occurs through **Petersen’s space**. This space is a potential defect created between the mesentery of the Roux-en-Y limb (alimentary limb) and the transverse mesocolon. It is a well-known complication following gastric bypass surgery (RYGB) or any Roux-en-Y reconstruction. * **Why Option A is Correct:** In a Roux-en-Y configuration, the lifted jejunal limb creates a gap behind it. If this space is not surgically closed, loops of the small bowel can herniate through it, leading to bowel obstruction, ischemia, or necrosis. * **Why Option B is Incorrect:** A hernia through the transverse mesocolon is specifically called a **Transmesocolic hernia**. This occurs if the defect created to pass the Roux limb (in retrocolic repairs) is not closed. * **Why Option C is Incorrect:** Cervical hernias are not a standard classification in general surgery; hernias in the neck region are usually related to discs (orthopedics) or lung apices (Sibson’s fascia). * **Why Option D is Incorrect:** A hernia through the epiploic foramen is known as a **Winslow’s foramen hernia**. **Clinical Pearls for NEET-PG:** 1. **Incidence:** Petersen’s hernia is more common in **Laparoscopic** Roux-en-Y Gastric Bypass compared to open surgery because laparoscopy results in fewer adhesions, allowing the bowel to move more freely into potential spaces. 2. **Presentation:** Patients often present with intermittent, "colicky" post-prandial abdominal pain before progressing to acute intestinal obstruction. 3. **Imaging:** On CT scan, look for the **"Swirl sign"** (torsion of the mesenteric vessels). 4. **Prevention:** The standard of care is the meticulous closure of both Petersen’s space and the mesenteric defect during the primary surgery.

Q: What is the most common form of shock?

Hypovolemic shock. **Explanation:** Shock is defined as a state of cellular and tissue hypoxia due to reduced oxygen delivery, increased oxygen consumption, or inadequate oxygen utilization. **1. Why Hypovolemic Shock is the Correct Answer:** Hypovolemic shock is statistically the **most common form of shock** encountered in clinical practice, particularly in surgical and emergency settings. It results from a decrease in intravascular volume, most frequently due to **hemorrhage** (trauma, GI bleed) or non-hemorrhagic fluid loss (vomiting, diarrhea, burns). In the context of trauma—a high-yield area for NEET-PG—hemorrhagic shock is the leading cause of preventable death. **2. Analysis of Incorrect Options:** * **Cardiogenic Shock:** Caused by primary pump failure (e.g., Myocardial Infarction). While common in cardiac ICUs, it is less frequent than hypovolemia in the general population. * **Neurogenic Shock:** A form of distributive shock caused by the loss of sympathetic tone following spinal cord injury. It is relatively rare. * **Septicemic (Septic) Shock:** A subset of distributive shock caused by a dysregulated host response to infection. While it is the most common cause of death in non-cardiac ICUs, it ranks second to hypovolemia in overall global incidence. **NEET-PG High-Yield Pearls:** * **Most common shock in trauma:** Hypovolemic (Hemorrhagic) shock. * **Most common cause of distributive shock:** Septic shock. * **Early sign of shock:** Tachypnea and Tachycardia (Note: Blood pressure may remain normal in "Compensated Shock"). * **The "Golden Hour":** The critical period following injury where rapid resuscitation from hypovolemic shock significantly improves survival.

Q: What is the recommended treatment for a strangulated hernia?

Immediate surgery. **Explanation:** A **strangulated hernia** is a surgical emergency where the blood supply to the herniated contents (usually bowel or omentum) is compromised, leading to ischemia, gangrene, and potential perforation. **Why "Immediate Surgery" is Correct:** The primary goal in strangulation is to restore blood flow or resect non-viable tissue. Once strangulation is suspected—characterized by a tense, tender, irreducible swelling with overlying skin changes and signs of intestinal obstruction—**immediate surgical exploration** is mandatory. Delaying surgery increases the risk of bowel necrosis, peritonitis, and sepsis, significantly raising morbidity and mortality rates. **Why Other Options are Incorrect:** * **Observation:** This is contraindicated as strangulation is a life-threatening condition that will not resolve spontaneously. * **Manual Reduction (Taxis):** This is **strictly contraindicated** in strangulated hernias. Forcing a potentially gangrenous bowel loop back into the peritoneal cavity can lead to "reduction en masse" or cause generalized peritonitis (reduction of necrotic bowel). * **Analgesics:** While pain management is part of supportive care, it does not treat the underlying vascular compromise and may mask worsening clinical signs. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** Irreducibility + Tenderness + Lack of cough impulse. * **Richter’s Hernia:** Only a part of the bowel wall is trapped; it can strangulate without causing complete intestinal obstruction. * **Maydl’s Hernia:** A "W-shaped" loop where the strangulated portion is located inside the abdomen, not in the hernia sac. * **Management Tip:** If a strangulated hernia reduces spontaneously during induction of anesthesia, the surgeon must still perform a laparotomy/laparoscopy to inspect the viability of the reduced bowel segment.

Q: Negative pressure dressing is used for which of the following indications?

Chronic non-healing diabetic ulcer. **Explanation:** **Negative Pressure Wound Therapy (NPWT)**, also known as Vacuum-Assisted Closure (VAC), is a gold-standard modality for managing complex wounds. **Why Option B is Correct:** NPWT is highly effective for **chronic non-healing diabetic ulcers** because it works through several mechanisms: * **Macro-strain:** Draws wound edges together, facilitating primary closure. * **Micro-strain:** Creates mechanical tension at the cellular level, stimulating angiogenesis and the formation of healthy **granulation tissue**. * **Exudate Management:** Continuously removes excess interstitial fluid and bacteria, reducing localized edema and improving capillary blood flow. **Why Other Options are Incorrect:** * **A. Removal of eschar:** NPWT is not a debridement tool. Wounds must be surgically debrided of all necrotic tissue and eschar before application; otherwise, the vacuum cannot reach the viable tissue. * **C. Unexplored fistulas:** NPWT is contraindicated in unexplored or non-enteric fistulas because the suction can worsen the tract or cause organ damage. * **D. Untreated osteomyelitis:** NPWT should not be applied over active, untreated bone infections as it may trap the infection and lead to sepsis. The infection must be treated with antibiotics and debridement first. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Malignancy in the wound, untreated osteomyelitis, exposed vital organs/vessels, and necrotic tissue with eschar. * **Pressure Settings:** Usually maintained between **-75 mmHg to -125 mmHg** (continuous or intermittent). * **Key Benefit:** It significantly reduces the frequency of dressing changes and prepares the wound bed for subsequent skin grafting or flaps.

Q: Hydatid cyst occurs most commonly in which organ?

Liver. **Explanation:** Hydatid disease is a parasitic infection caused by the larval stage of **Echinococcus granulosus**. The life cycle involves dogs as definitive hosts and sheep/cattle as intermediate hosts. Humans are accidental intermediate hosts. **Why Liver is the correct answer:** The primary route of infection is the ingestion of eggs (oncospheres) via contaminated food or water. Once ingested, the eggs hatch in the duodenum, and the larvae penetrate the intestinal mucosa to enter the **portal venous system**. Since the liver acts as the first major filter for portal blood, it is the most common site of involvement, accounting for approximately **70-75%** of cases. The right lobe is more frequently affected than the left. **Why other options are incorrect:** * **Lung (Option A):** This is the second most common site (15-25%). Larvae reach the lungs if they bypass the hepatic filter and enter the systemic circulation via the hepatic veins and inferior vena cava. In children, the lungs are relatively more common than in adults. * **Spleen (Option C):** Splenic involvement is rare (2-3%) and usually occurs via systemic dissemination or direct spread. * **Brain (Option D):** Cerebral hydatidosis is very rare (<1%) and typically presents with signs of increased intracranial pressure. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic Sign:** "Water lily sign" (detached endocyst membrane) on imaging. * **Serology:** ELISA is the screening test of choice; Casoni’s test is now obsolete. * **Treatment:** **PAIR** (Puncture, Aspiration, Injection of scolicidal agent, Re-aspiration) is used for specific WHO stages. * **Scolicidal agents:** Hypertonic saline (most common) or Cetrimide. **Formalin is no longer used** due to the risk of sclerosing cholangitis. * **Medical Management:** Albendazole is the drug of choice, often started pre-operatively to reduce cyst tension and prevent anaphylaxis from spillage.

Q: Reactionary hemorrhage occurs after extraction because of which of the following?

High blood pressure. **Explanation:** **Reactionary hemorrhage** is defined as bleeding that occurs within **24 hours** (usually 4–6 hours) following a surgical procedure or trauma. The underlying pathophysiology involves the **recovery of blood pressure** to normal or high levels as the effects of anesthesia (which often contains vasoconstrictors like adrenaline) wear off. During surgery, hypotension or local vasoconstriction may prevent bleeding from small vessels. As the patient’s blood pressure rises post-operatively or the vasoconstrictor effect diminishes, these small vessels dilate, or "clots are blown off," leading to reactionary hemorrhage. Therefore, **High blood pressure** is a primary systemic factor that triggers this event. **Analysis of Incorrect Options:** * **A. Broken roots:** While a retained root tip can cause delayed healing or infection, it is not a primary cause of acute reactionary hemorrhage. * **C. Sharp interdental septum:** This may cause irritation or localized pain but does not typically cause significant post-operative bleeding. * **D. Gingival laceration:** This would typically cause **Primary hemorrhage** (bleeding occurring at the time of surgery) rather than reactionary hemorrhage. **High-Yield NEET-PG Pearls:** 1. **Primary Hemorrhage:** Occurs at the time of surgery (due to vessel injury). 2. **Reactionary Hemorrhage:** Occurs within 24 hours (due to rise in BP/slippage of ligatures). 3. **Secondary Hemorrhage:** Occurs 7–14 days post-surgery (classically due to **infection** eroding a vessel wall). 4. **Management:** For reactionary hemorrhage in dental extraction, initial management includes local pressure, suturing, or hemostatic agents (like Gelfoam); systemic hypertension must be controlled.

Question 1

Gut suturing material is absorbed by which process?

Accepted Answer

Hydrolysis

Answer

Oxidation

Answer

Fibrinolysis

Answer

Proteolysis

Question 2

Petersen hernia is defined as:

Accepted Answer

An internal hernia located behind the Roux-en-Y limb

Answer

An internal hernia through the transverse mesocolon

Answer

A cervical hernia

Answer

A hernia through the epiploic foramen

Question 3

Which of the following is an evidence that splenectomy might benefit a patient with idiopathic thrombocytopenic purpura?

Accepted Answer

An increase in platelet count on corticosteroid therapy

Answer

A significantly enlarged spleen

Answer

A high reticulocyte count

Answer

Patient's age less than five years

Question 4

What is the most common form of shock?

Accepted Answer

Hypovolemic shock

Answer

Cardiogenic shock

Answer

Neurogenic shock

Answer

Septicemic shock

Question 5

Which of the following is NOT true about the components separation technique?

Accepted Answer

None of the above statements are true.

Answer

It is associated with a high wound infection risk.

Answer

Ramirez first described the technique.

Answer

It has a recurrence rate of around 20%.

Question 6

What is the recommended treatment for a strangulated hernia?

Accepted Answer

Immediate surgery

Answer

Observation

Answer

Manual reduction

Answer

Analgesics

Question 7

Negative pressure dressing is used for which of the following indications?

Accepted Answer

Chronic non-healing diabetic ulcer

Answer

Removal of eschar

Answer

Unexplored fistulas

Answer

Untreated osteomyelitis

Question 8

Hydatid cyst occurs most commonly in which organ?

Accepted Answer

Liver

Answer

Lung

Answer

Spleen

Answer

Brain

Question 9

Reactionary hemorrhage occurs after extraction because of which of the following?

Accepted Answer

High blood pressure

Answer

Broken roots

Answer

Sharp interdental septum

Answer

Gingival laceration

Question 10

A Grade III wound is considered contaminated if it is:

Accepted Answer

A wound contaminated with gross fecal material spillage

Answer

An appendicular perforation

Answer

A wound in the urinary tract without unusual contamination

Answer

A surgical site with no unusual contamination

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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