Trauma Practice Questions

Q: Which of the following is NOT a criterion for damage control surgery?

Serum lactate <2 mmol/L. **Explanation:** Damage Control Surgery (DCS) is a life-saving strategy used in trauma patients to prioritize the restoration of physiological stability over definitive anatomical repair. It is indicated when a patient reaches the "point of no return," characterized by the **Lethal Triad** (Acidosis, Hypothermia, and Coagulopathy). **Why Option C is the correct answer:** Serum lactate is a marker of tissue perfusion and anaerobic metabolism. A **serum lactate 5 mmol/L)** or a significant base deficit (>8 mEq/L), which signifies severe shock and metabolic exhaustion. **Analysis of other options (Criteria for DCS):** * **Hypothermia (Option A):** A core temperature **<35°C** impairs enzyme function and platelet activity, leading to coagulopathy. * **pH < 7.2 (Option B):** Severe metabolic **acidosis** (pH <7.2) reduces cardiac contractility and worsens the lethal triad. * **Blood Pressure <70 mmHg (Option C):** Refractory hypotension or a systolic BP consistently **<70–90 mmHg** despite resuscitation indicates exsanguination and the need for immediate abbreviated surgery. **High-Yield Facts for NEET-PG:** * **The Three Stages of DCS:** 1. Part 1: Abbreviated laparotomy (hemorrhage and contamination control). 2. Part 2: ICU resuscitation (rewarming, correcting coagulopathy/acidosis). 3. Part 3: Planned re-operation for definitive repair (usually 24–48 hours later). * **The Lethal Triad:** Acidosis, Hypothermia, Coagulopathy. * **Goal of DCS:** To stop "bleeding and leaking" only. Definitive anastomosis or complex reconstructions are contraindicated in the initial phase.

Q: In an adult, what percentage of total body surface area must be involved in a burn injury to cause shock?

15%. **Explanation:** The correct answer is **15%**. In an adult, a burn involving 15% or more of the Total Body Surface Area (TBSA) is sufficient to cause **hypovolemic (burn) shock**. **1. Why 15% is correct:** Burn shock is a complex combination of hypovolemic and distributive shock. When a burn exceeds 15% TBSA in adults (or 10% in children), the systemic inflammatory response leads to widespread capillary leak. This "third-spacing" results in massive fluid shifts from the intravascular compartment to the interstitial space. At the 15% threshold, the plasma loss is significant enough to cause hemodynamic instability, necessitating formal intravenous fluid resuscitation (e.g., Parkland Formula). **2. Why other options are incorrect:** * **20%:** While 20% is a significant burn and certainly causes shock, it is not the *minimum* threshold. In clinical practice, 20% is often the cutoff for initiating more aggressive monitoring, but shock physiology begins at 15%. * **25% & 30%:** These percentages represent major burns with a high risk of multi-organ dysfunction syndrome (MODS) and mortality, but the onset of burn shock occurs much earlier. **Clinical Pearls for NEET-PG:** * **Threshold for Fluid Resuscitation:** IV fluids are mandatory for burns **>15% in adults** and **>10% in children**. * **Parkland Formula:** $4 \text{ ml} \times \text{Body Weight (kg)} \times \% \text{ TBSA}$. Give half in the first 8 hours and the remainder over the next 16 hours. * **Fluid of Choice:** Ringer’s Lactate is the preferred crystalloid in the first 24 hours. * **Rule of nines:** Used for quick TBSA estimation; remember that the patient's palm (including fingers) represents approximately 1%.

Q: A history of lucid interval is characteristic of which type of intracranial hemorrhage?

Epidural hematoma (EDH). **Explanation:** **1. Why Epidural Hematoma (EDH) is Correct:** The **lucid interval** is a classic clinical phenomenon seen in approximately 20–30% of EDH cases. It occurs when an initial concussive injury causes a brief loss of consciousness (LOC), followed by a period of apparent recovery where the patient is awake and oriented. During this interval, an arterial bleed (most commonly the **Middle Meningeal Artery** due to a temporal bone fracture) is expanding. Once the hematoma reaches a critical volume, intracranial pressure rises sharply, leading to rapid neurological deterioration, herniation, and coma. **2. Why Other Options are Incorrect:** * **Subarachnoid Hemorrhage (SAH):** Typically presents with a "thunderclap headache" (worst headache of life) and meningeal signs. It does not follow the classic LOC-recovery-deterioration pattern. * **Intracerebral Hemorrhage (ICH):** Usually presents with focal neurological deficits that correspond to the area of brain parenchyma involved, often associated with chronic hypertension. * **Rupture of Intracranial Aneurysm:** This is the most common cause of non-traumatic SAH. While it causes sudden collapse, it does not feature a "lucid interval" as a characteristic diagnostic hallmark. **3. NEET-PG High-Yield Pearls:** * **Source of Bleed:** Middle Meningeal Artery (most common). * **CT Appearance:** **Biconvex (Lentiform)**, hyperdense, extra-axial collection that does *not* cross suture lines. * **Classic Presentation:** Trauma to the temple → Brief LOC → Lucid Interval → Ipsilateral dilated pupil (CN III palsy) → Contralateral hemiparesis. * **Management:** Urgent surgical evacuation (Burr hole or Craniotomy) if symptomatic or large (>15mm thickness or >30cm³ volume).

Q: Seat belt injury commonly involves which of the following?

Mesentery. ### Explanation **Correct Answer: B. Mesentery** **Mechanism of Injury:** Seat belt injuries typically occur due to a **sudden deceleration** force. When a vehicle stops abruptly, the lap belt acts as a fulcrum. The abdominal contents are compressed between the belt and the vertebral column. This creates a "shearing force" and a sudden rise in intraluminal pressure. The **mesentery** (especially near the ileocolic junction) and the **small bowel** are the most common structures involved because they are mobile parts of the gut attached to a fixed posterior abdominal wall, making them susceptible to deceleration-induced tearing. **Analysis of Incorrect Options:** * **A. Spleen:** While the spleen is the most common organ injured in overall blunt abdominal trauma, it is less specifically associated with seat belt compression compared to the mesentery and hollow viscera. * **C. Femoral artery:** This is rarely involved in seat belt trauma; it is more commonly associated with pelvic fractures or penetrating groin injuries. * **D. Abdominal aorta:** While traumatic aortic rupture can occur in high-velocity deceleration, it typically involves the thoracic aorta (near the ligamentum arteriosum). Abdominal aortic injury is rare and usually associated with direct, high-energy impact. **Clinical Pearls for NEET-PG:** * **Seat Belt Sign:** Ecchymosis across the lower abdomen is a high-yield clinical sign; its presence increases the risk of internal hollow viscus injury by nearly 8-fold. * **Chance Fracture:** Often associated with seat belt injuries, this is a horizontal distraction fracture of the thoracolumbar spine (T12-L2). * **Classic Triad:** Seat belt sign + Mesenteric/Bowel injury + Chance fracture. * **Management:** Mesenteric tears often present with delayed peritonitis or internal hemorrhage; CT scan with IV contrast is the investigation of choice in stable patients.

Q: According to the Parkland formula, what is the amount of Ringer's Lactate (RL) given in 24 hours for burn patients?

Percentage of burns * weight (kg) * 4. **Explanation:** The **Parkland Formula** is the gold standard for fluid resuscitation in burn patients during the first 24 hours following a thermal injury. The physiological basis for this formula is the massive fluid shift from the intravascular to the interstitial space due to increased capillary permeability (SIRS response). **Correct Answer (C):** The formula is calculated as **4 mL × Body Weight (kg) × Total Body Surface Area (TBSA) %**. * **Fluid of Choice:** Ringer’s Lactate (RL) is preferred because its composition is most similar to extracellular fluid and it helps prevent hyperchloremic metabolic acidosis (common with Normal Saline). * **Administration Schedule:** 50% of the total calculated volume is given in the **first 8 hours** (from the time of injury, not arrival), and the remaining 50% is given over the next 16 hours. **Incorrect Options:** * **Option A (2 mL):** This is the **Modified Brooke Formula**, often used in some centers to avoid "fluid creep" (over-resuscitation), but it is not the Parkland standard. * **Option B (3 mL):** This volume is typically used in the **Modified Parkland Formula** for pediatric patients or specific guidelines for chemical burns, but it does not represent the classic Parkland calculation. * **Option D (5 mL):** This exceeds the standard requirement and increases the risk of pulmonary edema and abdominal compartment syndrome. **High-Yield NEET-PG Pearls:** 1. **Rule of 9s:** Used to calculate TBSA. Note that 1st-degree burns (erythema only) are **excluded** from the calculation. 2. **Monitoring:** The best indicator of adequate fluid resuscitation is **Urine Output**. Target: **0.5–1.0 mL/kg/hr** in adults and **1.0 mL/kg/hr** in children. 3. **Pediatrics:** Children require maintenance fluids (Dextrose-containing) in addition to the Parkland formula due to limited glycogen stores.

Q: Curling's ulcer is typically seen if the burn area is more than what percentage of the total body surface area?

35%. **Explanation:** **Curling’s Ulcer** is an acute stress ulcer of the duodenum (more common) or stomach that occurs as a complication of severe burn injuries. The underlying pathophysiology involves severe hypovolemia leading to mucosal ischemia. Reduced blood flow to the gastrointestinal tract results in the breakdown of the protective mucosal barrier, allowing gastric acid to cause deep, often multiple, ulcerations. 1. **Why 35% is correct:** Clinical studies and surgical literature (including Bailey & Love) indicate that the risk of developing a Curling’s ulcer increases significantly once the burn exceeds **35% of the Total Body Surface Area (TBSA)**. At this threshold, the systemic inflammatory response and fluid shifts are profound enough to compromise splanchnic perfusion consistently. 2. **Why other options are wrong:** While patients with 45%, 55%, or 65% TBSA burns are at an even higher risk of gastrointestinal complications, 35% is the established clinical benchmark where the incidence becomes statistically significant. Options B, C, and D represent more extreme injuries but are not the "threshold" percentage typically tested in surgical exams. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most commonly found in the **proximal duodenum**. * **Cushing’s Ulcer:** Contrast this with Curling’s; Cushing’s ulcers are associated with **Increased Intracranial Pressure (ICP)** or head trauma and are typically found in the stomach (due to vagal overstimulation and hyperacidity). * **Prophylaxis:** The incidence of Curling’s ulcer has decreased significantly in modern practice due to aggressive fluid resuscitation and the routine use of H2 blockers or Proton Pump Inhibitors (PPIs) in burn units. * **Complication:** The most common presentation of a symptomatic Curling’s ulcer is painless upper GI bleeding (hematemesis or melena).

Q: Which of the following is NOT a feature of compensated hypovolemic shock?

Increased SBP. **Explanation:** In hypovolemic shock, the body initiates compensatory mechanisms to maintain perfusion to vital organs. This is primarily mediated by the **sympathetic nervous system** and the **Renin-Angiotensin-Aldosterone System (RAAS)**. **Why "Increased SBP" is the correct answer:** In compensated shock (Class I and early Class II hemorrhage), the **Systolic Blood Pressure (SBP) typically remains normal or slightly decreased**, but it **never increases**. SBP is a reflection of stroke volume; as blood volume drops, stroke volume falls. While compensatory mechanisms work to maintain SBP, they cannot elevate it above baseline in the presence of true hypovolemia. **Analysis of Incorrect Options:** * **Increased PR (Pulse Rate):** This is the **earliest sign** of shock. Tachycardia occurs via the baroreceptor reflex to maintain cardiac output ($CO = HR \times SV$) as stroke volume declines. * **Increased DBP (Diastolic Blood Pressure):** Sympathetic stimulation causes peripheral vasoconstriction (increased Systemic Vascular Resistance). This elevates the DBP, which characteristically leads to a **narrowed pulse pressure**, a hallmark of early shock. * **Increased RR (Respiratory Rate):** Tachypnea occurs early due to sympathetic activation and as a compensatory response to metabolic acidosis (lactic acidosis) resulting from tissue hypoperfusion. **NEET-PG High-Yield Pearls:** 1. **Definition of Decompensated Shock:** Shock is considered "decompensated" once the SBP begins to fall (usually after >30% blood loss, Class III). 2. **Narrow Pulse Pressure:** An early clinical sign of hypovolemia caused by the rise in DBP (vasoconstriction) and slight fall in SBP. 3. **Class II Hemorrhage (15-30% loss):** This is the stage where tachycardia and narrowed pulse pressure are most evident while SBP is still maintained. 4. **Urine Output:** A critical indicator of organ perfusion; it starts decreasing in Class II shock.

Question 1

What is the first line of therapy in the treatment of shock?

Accepted Answer

IV fluids

Answer

Antibiotics

Answer

Ionotropic agents

Answer

Chronotropic agents

Question 2

Which of the following is NOT a criterion for damage control surgery?

Accepted Answer

Serum lactate <2 mmol/L

Answer

Hypothermia

Answer

pH < 7.2

Answer

Blood pressure <70 mmHg

Question 3

Which of the following statements regarding burn management is true?

Accepted Answer

Escharotomy should be performed for a circumferential burn of a limb.

Answer

Intravenous access and fluid resuscitation are initiated, and antibiotics are not given in children.

Answer

Moist dressings are the preferred method for burn wound care.

Answer

The Parkland formula is used, calculating 8 mL/kg body weight for fluid resuscitation.

Question 4

In an adult, what percentage of total body surface area must be involved in a burn injury to cause shock?

Accepted Answer

15%

Answer

20%

Answer

25%

Answer

30%

Question 5

A 64-year-old male presents to the emergency department following a car accident with pulse 94 bpm, blood pressure 95/60 mm Hg, and HCT 30%. Severe hematuria is noted. After initial resuscitation, his blood pressure improves to 120/80 mm Hg. A CT scan shows extensive contusion of the left kidney and perirenal fat. His blood pressure subsequently declines to 80/40 mm Hg. What is the most appropriate surgical approach for an urgent laparotomy in this patient?

Accepted Answer

Midline abdominal incision

Answer

Left flank incision

Answer

Gibson incision

Answer

Thoracoabdominal incision

Question 6

A history of lucid interval is characteristic of which type of intracranial hemorrhage?

Accepted Answer

Epidural hematoma (EDH)

Answer

Subarachnoid hemorrhage (SAH)

Answer

Intracerebral hemorrhage (ICH)

Answer

Rupture of an intracranial aneurysm

Question 7

Seat belt injury commonly involves which of the following?

Accepted Answer

Mesentery

Answer

Spleen

Answer

Femoral artery

Answer

Abdominal aorta

Question 8

According to the Parkland formula, what is the amount of Ringer's Lactate (RL) given in 24 hours for burn patients?

Accepted Answer

Percentage of burns * weight (kg) * 4

Answer

Percentage of burns * weight (kg) * 2

Answer

Percentage of burns * weight (kg) * 3

Answer

Percentage of burns * weight (kg) * 5

Question 9

Curling's ulcer is typically seen if the burn area is more than what percentage of the total body surface area?

Accepted Answer

35%

Answer

45%

Answer

55%

Answer

65%

Question 10

Which of the following is NOT a feature of compensated hypovolemic shock?

Accepted Answer

Increased SBP

Answer

Increased PR

Answer

Increased DBP

Answer

Increased RR

Trauma — MCQs

Trauma — MCQs

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