Trauma Practice Questions

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.

Q: The TRISS methodology includes all of the following components except?

Urine output. The **TRISS (Trauma and Injury Severity Score)** methodology is the international standard used to predict the probability of survival ($P_s$) in trauma patients. It combines anatomical and physiological parameters to provide a comprehensive outcome analysis. ### **Why "Urine Output" is the Correct Answer** Urine output is a clinical indicator of renal perfusion and shock status, but it is **not** a component of the TRISS formula. TRISS relies on static anatomical data (ISS), dynamic physiological data (RTS), and demographic data (Age). ### **Analysis of Other Options** * **Injury Severity Score (ISS):** This represents the **anatomical** component. It is calculated by summing the squares of the highest Abbreviated Injury Scale (AIS) scores in the three most severely injured body regions. * **Revised Trauma Score (RTS):** This represents the **physiological** component. It is calculated using three parameters: Glasgow Coma Scale (GCS), Systolic Blood Pressure (SBP), and Respiratory Rate (RR). * **Patient's Age:** Age is a critical prognostic factor. In TRISS, age is treated as a binary variable: patients are categorized as either $<55$ years or $\geq 55$ years. ### **High-Yield Clinical Pearls for NEET-PG** * **The Formula:** $P_s = 1 / (1 + e^{-b})$, where '$b$' is derived from a regression equation: $b = w + (f_1 \times \text{RTS}) + (f_2 \times \text{ISS}) + (f_3 \times \text{Age Index})$. * **Mechanism of Injury:** TRISS uses different coefficients ($w, f_1, f_2, f_3$) depending on whether the trauma is **Blunt** or **Penetrating**. * **Limitation:** TRISS does not account for pre-existing comorbidities (except age) or the cumulative effect of multiple injuries in the same body region. * **ASCOT:** The "Addressed Severity Characterization of Trauma" is a newer system intended to improve upon TRISS by including more detailed age categories and specific injury profiles.

Q: Bucket handle type of fractures are typically seen in which population group?

Edentulous persons. **Explanation:** The correct answer is **Edentulous persons**. **Why Edentulous Persons?** In the context of maxillofacial trauma, a "bucket handle" fracture refers to **bilateral fractures of the body of the mandible** in an edentulous (toothless) patient. In these individuals, the mandible undergoes significant alveolar bone resorption, making it thin and atrophic. When a bilateral fracture occurs, the anterior segment of the mandible is displaced downwards and backwards by the action of the geniohyoid and genioglossus muscles. This displacement resembles the movement of a bucket handle. This is a critical clinical scenario because the posterior displacement of the tongue (attached to the genial tubercles) can lead to acute airway obstruction. **Analysis of Incorrect Options:** * **Children:** Pediatric mandibular fractures are more likely to be "Greenstick" fractures due to the high organic content and elasticity of the bone. * **Soldiers:** This group is typically associated with "March fractures" (stress fractures of the metatarsals) due to repetitive loading, or high-velocity ballistic trauma. * **Young Adults:** This demographic most commonly sustains mandibular fractures due to road traffic accidents or assaults, but they usually have dentition that provides structural stability, preventing the specific "bucket handle" displacement pattern. **Clinical Pearls for NEET-PG:** * **Airway Emergency:** The primary concern in a bucket handle fracture is the loss of tongue support, leading to upper airway obstruction. * **Atrophic Mandible:** The risk of this fracture increases as the vertical height of the mandible decreases below 10-15mm. * **Management:** Unlike dentate patients, these are often managed with Gunning splints or internal fixation, as there are no teeth for intermaxillary fixation (IMF).

Q: Lower lip paresthesia occurs in which type of fracture?

Body fracture. **Explanation:** The correct answer is **Body fracture**. This clinical finding is based on the anatomical course of the **Inferior Alveolar Nerve (IAN)**, a branch of the mandibular nerve (V3). 1. **Why Body Fracture is Correct:** The IAN enters the mandible through the mandibular foramen on the medial side of the ramus and travels within the **mandibular canal**, which runs through the body of the mandible. It exits as the **mental nerve** through the mental foramen (typically located between the first and second premolars). A fracture of the mandibular body distal to the mandibular foramen often compresses or lacerates the IAN, leading to anesthesia or paresthesia of the lower lip and chin (the sensory distribution of the mental nerve). 2. **Why Other Options are Incorrect:** * **Symphysis/Parasymphysis fracture:** These occur in the midline or between the canine teeth. While they can occasionally affect the terminal branches of the mental nerve, the nerve is more frequently spared or the injury is localized compared to the direct canal involvement seen in body fractures. * **Coronoid fracture:** This involves the superior-anterior projection of the ramus. The IAN is located much lower and more medial, so it is rarely affected. * **Condyle fracture:** This is the most common site of mandibular fracture. However, because the fracture occurs above the entry point of the IAN into the mandibular foramen, lip sensation remains intact. **High-Yield Clinical Pearls for NEET-PG:** * **Vincent’s Sign:** Paresthesia of the lower lip following a mandibular fracture; it is a pathognomonic sign of a fracture distal to the mandibular foramen. * **Most common site of Mandibular Fracture:** Condyle > Angle > Body. * **Guardsman Fracture:** A midline symphysis fracture combined with bilateral condylar fractures, often caused by a direct blow to the chin.

Q: A patient with a head injury presents with clear nasal discharge from the right nostril while conscious. Non-contrast computed tomography (NCCT) of the head reveals a non-operable injury to the frontobasal area. What is the most appropriate management?

Wait and watch for 4-5 days to allow spontaneous healing.. **Explanation:** The clinical presentation of clear nasal discharge following head trauma is diagnostic of **CSF Rhinorrhea**, resulting from a dural tear and a fracture in the anterior skull base (commonly the cribriform plate or frontal sinus). **1. Why Option A is Correct:** The cornerstone of managing post-traumatic CSF leaks is **conservative management**. Approximately 70–85% of traumatic CSF leaks heal spontaneously within 7–10 days. The initial management involves bed rest with the head elevated (30–45°), avoiding straining (Valsalva maneuvers), and observation. A waiting period of 4–7 days is standard before considering invasive interventions, as most dural defects seal as the brain edema subsides and fibrin deposition occurs. **2. Why Other Options are Incorrect:** * **Option B:** MRI (specifically MR Cisternography) is useful for localizing a persistent leak but is not indicated in the acute phase before a trial of conservative management. * **Option C:** Lumbar drains (dural catheters) are second-line treatments used if the leak persists beyond the initial observation period; they are not the immediate first step. * **Option D:** Surgical repair (transcranial or endoscopic) is reserved for "non-healing" leaks (usually persisting >7–14 days), cases of meningitis, or large intracranial complications. **Clinical Pearls for NEET-PG:** * **Diagnosis:** The "Target sign" or "Halo sign" on bedsheets and a **Beta-2 Transferrin test** (most specific) confirm CSF. * **Imaging:** High-resolution CT (HRCT) of the paranasal sinuses is the gold standard for locating the bony defect. * **Prophylaxis:** Routine use of prophylactic antibiotics is **not recommended** as it does not prevent meningitis and may select for resistant organisms. * **Glucose:** CSF glucose >40 mg/dL (or >60% of blood glucose) helps differentiate it from allergic rhinitis.

Q: Which of the following is true regarding superficial burns?

Can be healed within 7 to 10 days. ### Explanation **Correct Answer: D. Can be healed within 7 to 10 days** **1. Understanding the Concept** Superficial burns (specifically **First-degree burns** and **Superficial Partial-thickness burns**) involve the epidermis and potentially the superficial papillary dermis. Because the basal layer of the epidermis or the skin appendages (hair follicles, sweat glands) remain intact, these burns possess excellent regenerative capacity. They typically heal through spontaneous epithelialization within **7 to 10 days** (for first-degree) or **10 to 14 days** (for superficial partial-thickness) without significant scarring. **2. Analysis of Incorrect Options** * **A. Always requires skin grafting:** Incorrect. Superficial burns heal spontaneously. Skin grafting is reserved for **Full-thickness (3rd degree)** or deep partial-thickness burns that cannot re-epithelialize on their own. * **B. Dry and inelastic:** Incorrect. This describes **Full-thickness burns** (eschar). Superficial burns are typically moist, erythematous, and blanch on pressure due to intact capillary refill. * **C. Blister formation:** While blisters are a hallmark of **Partial-thickness (2nd degree)** burns, they are *not* a feature of simple **Superficial (1st degree)** burns (e.g., classic sunburn). Since the question asks generally about "superficial burns" and Option D is a definitive physiological timeline, D is the most accurate clinical characteristic. **3. NEET-PG High-Yield Pearls** * **Pain:** Superficial burns are **exquisitely painful** because nerve endings are exposed but intact. * **Rule of 9s (Wallace):** Used to estimate Total Body Surface Area (TBSA) in adults. * **Parkland Formula:** $4 \text{ mL} \times \text{Weight (kg)} \times \% \text{ TBSA}$ (Give half in first 8 hours). * **Jackson’s Zones of Burn:** Zone of Coagulation (necrosis), Zone of Stasis (potentially salvageable), and Zone of Hyperemia (will recover).

Question 1

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 2

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 3

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

Question 4

The TRISS methodology includes all of the following components except?

Accepted Answer

Urine output

Answer

Injury Severity Score (ISS)

Answer

Revised Trauma Score (RTS)

Answer

Patient's age

Question 5

Bucket handle type of fractures are typically seen in which population group?

Accepted Answer

Edentulous persons

Answer

Children

Answer

Soldiers

Answer

Young adults

Question 6

Lower lip paresthesia occurs in which type of fracture?

Accepted Answer

Body fracture

Answer

Symphysis fracture

Answer

Coronoid fracture

Answer

Condyle fracture

Question 7

A patient with a head injury presents with clear nasal discharge from the right nostril while conscious. Non-contrast computed tomography (NCCT) of the head reveals a non-operable injury to the frontobasal area. What is the most appropriate management?

Accepted Answer

Wait and watch for 4-5 days to allow spontaneous healing.

Answer

Perform an MRI to localize the leak and control the discharge endoscopically.

Answer

Insert a dural catheter to control the cerebrospinal fluid (CSF) leak.

Answer

Proceed with a transcranial approach to repair the damaged frontobasal region.

Question 8

Tension pneumothorax due to a fractured rib is treated by?

Accepted Answer

Tube drainage

Answer

Strapping

Answer

Intermittent positive pressure ventilation (IPPV)

Answer

Internal fixation with open reduction

Question 9

In a 60 kg man with 40% burns, what is the amount of Ringer's lactate given in the first 8 hours?

Accepted Answer

4800 ml

Answer

9600 ml

Answer

6400 ml

Answer

3200 ml

Question 10

Which of the following is true regarding superficial burns?

Accepted Answer

Can be healed within 7 to 10 days

Answer

Always requires skin grafting

Answer

Dry and inelastic

Answer

Blister formation

Trauma — MCQs

Trauma — MCQs

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