General Surgery Principles Practice Questions

Q: Massive blood transfusion is defined as?

Replacement of the entire blood volume. **Explanation:** Massive Blood Transfusion (MBT) is clinically defined based on the volume of blood replaced within a specific timeframe, reflecting a life-threatening hemorrhagic state. **Why the Correct Answer is Right:** The most widely accepted definition of MBT is the **replacement of a patient’s total blood volume within 24 hours**. In an average adult, this equates to approximately 10 units of packed red blood cells (PRBCs). Other definitions include the replacement of 50% of the total blood volume within 3 hours or a rate of loss exceeding 150 ml/min. The goal of identifying MBT is to trigger "Massive Transfusion Protocols" (MTP) to prevent the "Lethal Triad" of trauma. **Why the Incorrect Options are Wrong:** * **Options A, B, and C:** These options describe specific rates of infusion (e.g., 1 liter in 5 minutes). While these represent rapid resuscitation in hemorrhagic shock, they do not meet the standardized definition of MBT, which focuses on the **cumulative volume** relative to the patient's total circulatory capacity rather than a single 5-minute bolus. **High-Yield Clinical Pearls for NEET-PG:** * **The Lethal Triad:** MBT aims to combat **Acidosis, Hypothermia, and Coagulopathy**. * **MTP Ratio:** Modern protocols recommend a **1:1:1 ratio** (1 unit PRBC : 1 unit FFP : 1 unit Platelets) to mimic whole blood and prevent dilutional coagulopathy. * **Complications of MBT:** * **Hypocalcemia:** Due to citrate toxicity (citrate binds calcium). * **Hyperkalemia:** Due to RBC lysis in stored blood. * **Hypothermia:** If blood is not warmed. * **TRALI:** Transfusion-Related Acute Lung Injury (most common cause of transfusion-related death).

Q: Which physical principle does this scalpel operate on?

Ultrasonic waves. ***Ultrasonic waves*** - This **harmonic scalpel** operates using **ultrasonic vibrations** at approximately **55,500 Hz** to simultaneously cut and coagulate tissue. - The ultrasonic energy causes **protein denaturation** through mechanical vibration, providing precise cutting with minimal thermal damage. *Electricity* - **Electrosurgery** uses electrical current to generate heat for cutting and coagulation, not the mechanism shown in this device. - Electrocautery devices have different electrode configurations and produce more **thermal spread** compared to ultrasonic scalpels. *Laser* - **Laser scalpels** use focused **light energy** (photons) to cut tissue through thermal vaporization. - Laser devices require different safety protocols including **eye protection** and have distinct beam delivery systems. *Radiofrequency* - **Radiofrequency devices** use electromagnetic energy in the RF spectrum to generate heat for tissue ablation. - RF energy typically operates at lower frequencies than ultrasonic devices and has different tissue interaction mechanisms.

Q: What is the most common organism causing peritonitis?

E. coli. **Explanation:** The most common cause of peritonitis, particularly **secondary peritonitis**, is the translocation of indigenous flora from the gastrointestinal tract following a hollow viscus perforation (e.g., perforated peptic ulcer or appendix). Since the large intestine contains the highest concentration of bacteria, the flora is dominated by Gram-negative aerobes and anaerobes. **Escherichia coli (E. coli)** is the most frequently isolated aerobic organism in these cases, often found in polymicrobial synergy with anaerobes like *Bacteroides fragilis*. **Analysis of Options:** * **B. E. coli (Correct):** It is the leading cause of both secondary peritonitis (due to GI perforation) and Spontaneous Bacterial Peritonitis (SBP) associated with cirrhosis. * **A. Klebsiella:** While a common Gram-negative pathogen in the gut, it is the second most common cause after E. coli. * **C. Staphylococcus aureus:** This is a common cause of peritonitis specifically in patients undergoing **Continuous Ambulatory Peritoneal Dialysis (CAPD)**, where the infection is introduced via the skin/catheter. * **D. Streptococcus:** *Streptococcus pneumoniae* can cause primary peritonitis in children (especially those with nephrotic syndrome), but it is not the most common cause in the general population. **Clinical Pearls for NEET-PG:** * **Most common cause of SBP:** E. coli. * **Most common cause of CAPD peritonitis:** *Staphylococcus epidermidis* (overall) or *Staphylococcus aureus*. * **Most common cause of Post-operative peritonitis:** Often involves multi-drug resistant organisms like *Pseudomonas* or *Enterococcus*. * **Primary Peritonitis (Childhood):** Often associated with *Streptococcus pneumoniae* or Group A *Streptococcus*.

Q: Which of the following is NOT an indication for splenectomy?

Chediak-Higashi syndrome. **Explanation:** The correct answer is **Chediak-Higashi syndrome**. This is an autosomal recessive disorder characterized by a defect in the **LYST gene**, leading to impaired microtubule assembly and giant lysosomal granules. While patients present with partial albinism, recurrent pyogenic infections, and progressive neurological defects, the primary treatment is **Bone Marrow Transplantation**. Splenectomy is not a standard indication as it does not address the underlying phagocytic defect. **Analysis of other options:** * **Hereditary Spherocytosis:** Splenectomy is the **treatment of choice** for moderate to severe cases. It eliminates the site of premature red cell destruction (the splenic cords), thereby curing the anemia and preventing gallstone formation. * **Hairy Cell Leukemia:** While Cladribine is the modern drug of choice, splenectomy is indicated for patients with massive splenomegaly causing discomfort or severe cytopenias (hypersplenism) that do not respond to systemic therapy. * **Immune Thrombocytopenic Purpura (ITP):** Splenectomy is a classic **second-line treatment** for patients who fail corticosteroid therapy. It removes both the primary site of platelet destruction and a major source of anti-platelet antibody production. **Clinical Pearls for NEET-PG:** * **Vaccination:** Post-splenectomy patients must receive vaccinations against encapsulated organisms (*S. pneumoniae, H. influenzae, N. meningitidis*) ideally **2 weeks before** elective surgery or **2 weeks after** emergency surgery. * **Blood Picture:** Look for **Howell-Jolly bodies**, Pappenheimer bodies, and Heinz bodies on a peripheral smear post-splenectomy. * **OPSI:** Overwhelming Post-Splenectomy Infection is most commonly caused by *Streptococcus pneumoniae*.

Q: Which of the following is the primary use of the nasogastric tube depicted?

Gastric drainage. ***Gastric drainage*** - A **nasogastric tube** (Ryle's tube) is primarily designed for **gastric decompression** and drainage of stomach contents. - It helps remove **gastric secretions**, **air**, and **fluid** to prevent distension and aspiration, especially post-operatively. *Common bile duct drainage* - **Bile duct drainage** requires specialized tubes like **T-tubes** or **percutaneous transhepatic cholangiography (PTC)** catheters. - A nasogastric tube cannot reach the **biliary system** as it terminates in the stomach. *Jejunal feeding* - **Jejunal feeding** requires a **nasojejunal tube** or **jejunostomy tube** that extends beyond the **pylorus** into the small intestine. - A standard nasogastric tube ends in the **stomach** and is unsuitable for direct jejunal nutrition. *Pelvic drainage* - **Pelvic drainage** requires **surgical drains** placed directly in the pelvic cavity through the **abdomen** or **perineum**. - A nasogastric tube inserted through the **nose** cannot access pelvic structures anatomically.

Q: Suturing in facial wound injuries should ideally be performed within what timeframe?

6 hours. **Explanation:** The primary concern in wound management is the risk of infection and the "Golden Period" for primary closure. For most traumatic wounds, the standard timeframe for primary suturing is within **6 hours**. **1. Why 6 hours is correct:** This timeframe is based on the bacterial growth curve. After an injury, bacteria contaminate the wound but require time to colonize and multiply to a critical level (typically $>10^5$ organisms per gram of tissue). Within the first 6 hours, the wound is considered "contaminated" but not yet "infected." Primary closure during this window significantly reduces the risk of wound dehiscence and sepsis. **2. Analysis of Incorrect Options:** * **2 & 4 hours (Options A & C):** While suturing earlier is always better for tissue viability, these timeframes are unnecessarily restrictive. The risk of infection does not increase significantly between hours 2 and 6. * **8 hours (Option D):** By 8 hours, the bacterial load often reaches the threshold for clinical infection. Closing a wound after this period (especially on the trunk or limbs) increases the risk of trapping pathogens, leading to abscess formation. **3. Clinical Pearls for NEET-PG:** * **The Exception (Face and Scalp):** Due to the **excellent vascularity** of the face and scalp, the "Golden Period" can often be extended up to **12–24 hours**. However, in standard surgical teaching and general MCQ patterns, 6 hours remains the classic benchmark for primary closure. * **Primary vs. Delayed Primary Closure:** Wounds presenting after 6–8 hours (or heavily soiled wounds) should be managed by **Delayed Primary Closure (Third Intention)**—usually performed 3–5 days later after ensuring the wound is clean. * **Bites:** Human and animal bites are generally not closed primarily (regardless of the timeframe) due to high polymicrobial contamination, except in specific cosmetic areas like the face where loose suturing may be considered.

Question 1

Aseptic peritonitis is seen in which of the following conditions?

Accepted Answer

Irritation due to abnormal physiological fluid in the peritoneum

Answer

Iatrogenic or postoperative causes

Answer

Gastric perforation

Answer

Anastomosis leak

Question 2

Massive blood transfusion is defined as?

Accepted Answer

Replacement of the entire blood volume

Answer

350 ml in 5 minutes

Answer

500 ml in 5 minutes

Answer

1 liter in 5 minutes

Question 3

Which physical principle does this scalpel operate on?

Accepted Answer

Ultrasonic waves

Answer

Electricity

Answer

Laser

Answer

Radiofrequency

Question 4

Which of the following is NOT a natural response to injury?

Accepted Answer

Anabolism

Answer

Immobility/rest

Answer

Anorexia

Answer

Catabolism

Question 5

What are the differentiating features between sepsis and trauma?

Accepted Answer

Energy requirement

Answer

Catabolism

Answer

Insulin resistance

Answer

Fluid loss

Question 6

What is the most common organism causing peritonitis?

Accepted Answer

E. coli

Answer

Klebsiella

Answer

Staphylococcus aureus

Answer

Streptococcus

Question 7

In infection involving the submandibular space when extraoral incision and drainage are necessary, which of the following structures must be divided?

Accepted Answer

Skin, superficial fascia, platysma, masseter muscle, and deep cervical fascia

Answer

Skin only

Answer

Skin and superficial fascia only

Answer

Skin, superficial fascia, platysma, and masseter muscle

Question 8

Which of the following is NOT an indication for splenectomy?

Accepted Answer

Chediak-Higashi syndrome

Answer

Hereditary spherocytosis

Answer

Hairy cell leukemia

Answer

Immune thrombocytopenic purpura (ITP)

Question 9

Which of the following is the primary use of the nasogastric tube depicted?

Accepted Answer

Gastric drainage

Answer

Common bile duct drainage

Answer

Jejunal feeding

Answer

Pelvic drainage

Question 10

Suturing in facial wound injuries should ideally be performed within what timeframe?

Accepted Answer

6 hours

Answer

2 hours

Answer

4 hours

Answer

8 hours

General Surgery Principles — MCQs

General Surgery Principles — MCQs

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