Trauma — MCQs

A 68-year-old hypertensive man undergoes successful repair of a ruptured abdominal aortic aneurysm. He receives 9 L Ringer's lactate solution and 4 units of whole blood during the operation. Two hours after transfer to the surgical intensive care unit, the following hemodynamic parameters are obtained: systemic blood pressure (BP) 90/60 mm Hg, pulse 110 beats per minute, central venous pressure (CVP) 7 mm Hg, pulmonary artery pressure 28/10 mm Hg, pulmonary capillary wedge pressure (PCWP) 8 mm Hg, cardiac output 1.9 L/min, systemic vascular resistance 1400 (dyne*s)/cm5 (normal is 900-1300), PaO2 140 mm Hg (FiO2: 0.45), urine output 15 mL/h (specific gravity: 1.029), and hematocrit 35%. Given this data, which of the following is the most appropriate next step in management?

Q127Easy

Early stage of trauma is characterized by which metabolic process?

Q128Easy

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

Q129Easy

Seat belt injury commonly involves which of the following?

Q130Easy

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

Trauma Indian Medical PG Practice Questions and MCQs

Question 121: What is the first line of therapy in the treatment of shock?

A. Antibiotics
B. Ionotropic agents
C. Chronotropic agents
D. IV fluids (Correct Answer)

Explanation: **Explanation:** The management of shock, regardless of the etiology, follows the primary survey principles of **ABC (Airway, Breathing, and Circulation)**. In the "Circulation" phase, the immediate goal is to restore intravascular volume and improve tissue perfusion. **Why IV Fluids are the Correct Answer:** In the initial management of shock—especially hypovolemic (the most common type in trauma) and distributive shock—there is a deficit in effective circulating volume. **IV fluids (specifically isotonic crystalloids like Ringer’s Lactate)** are the first-line therapy because they rapidly increase preload, stroke volume, and cardiac output. According to ATLS guidelines, an initial bolus of warmed isotonic crystalloid is the standard first step to stabilize hemodynamics before considering more invasive interventions. **Why Other Options are Incorrect:** * **Antibiotics:** While crucial in septic shock, they are adjunctive treatments to control the source of infection and do not provide immediate hemodynamic stabilization. * **Inotropic/Chronotropic agents:** These (e.g., Noradrenaline, Dobutamine) are considered **second-line** therapies. They are only indicated if the patient remains hypotensive *after* adequate fluid resuscitation (fluid-refractory shock) or in specific cases like cardiogenic shock where fluid overload must be avoided. **High-Yield Clinical Pearls for NEET-PG:** * **Best Initial Fluid:** Ringer’s Lactate (Hartmann's solution) is preferred over Normal Saline to avoid hyperchloremic metabolic acidosis. * **The "Golden Hour":** The first 60 minutes post-trauma where rapid fluid resuscitation and hemorrhage control significantly reduce mortality. * **Permissive Hypotension:** In trauma patients with active non-compressible hemorrhage, aim for a lower-than-normal BP (MAP ~65 mmHg) to prevent "popping the clot" until surgical control is achieved. * **Rule of 3-for-1:** Traditionally, 3 mL of crystalloid is given for every 1 mL of blood lost.

Question 122: A newborn child presents with an inverted foot, and the dorsum of the foot cannot touch the anterior tibia. What is the most probable diagnosis?

A. Congenital vertical talus
B. Arthrogryposis multiplex
C. Congenital talipes equinovarus (Correct Answer)
D. Flat foot

Explanation: **Explanation:** The clinical presentation described—an inverted foot where the dorsum cannot touch the anterior tibia—is the classic description of **Congenital Talipes Equinovarus (CTEV)**, also known as Clubfoot. **1. Why CTEV is correct:** CTEV is characterized by four primary deformities (Mnemonic: **CAVE**): * **C**avus (high arch) * **A**dduction of the forefoot * **V**arus (inversion of the heel) * **E**quinus (plantarflexion at the ankle) The **Equinus** component is the reason the dorsum of the foot cannot touch the anterior tibia (loss of dorsiflexion). The **Varus** component causes the inversion. **2. Why other options are incorrect:** * **Congenital Vertical Talus (CVT):** Also known as "Rocker-bottom foot." Unlike CTEV, the foot is **everted** and the midfoot is dorsiflexed, making the sole convex. * **Arthrogryposis Multiplex:** While CTEV can be a feature of this syndrome, it involves multiple joint contractures present at birth throughout the body, not just an isolated foot deformity. * **Flat Foot (Pes Planus):** This involves the loss of the medial longitudinal arch. It does not present with inversion or fixed equinus deformity in a newborn. **3. High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** The **Ponseti Method** (serial casting). The order of correction is **CAVE** (Cavus first, Equinus last). * **Pirani Score:** Used to assess the severity of CTEV (0 to 6 scale). * **Radiology:** Kite’s Angle (Talo-calcaneal angle) is **decreased** (<20°) in CTEV on both AP and lateral views. * **Last deformity to be corrected:** Equinus (often requires a percutaneous Achilles tenotomy).

Question 123: Which of the following is NOT a criterion for damage control surgery?

A. Hypothermia
B. pH < 7.2
C. Serum lactate <2 mmol/L (Correct Answer)
D. Blood pressure <70 mmHg

Explanation: **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 <2 mmol/L is a normal value**, indicating adequate perfusion. In contrast, a criterion for DCS is **elevated 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.

Question 124: Which of the following statements regarding burn management is true?

A. Intravenous access and fluid resuscitation are initiated, and antibiotics are not given in children.
B. Escharotomy should be performed for a circumferential burn of a limb. (Correct Answer)
C. Moist dressings are the preferred method for burn wound care.
D. The Parkland formula is used, calculating 8 mL/kg body weight for fluid resuscitation.

Explanation: **Explanation:** **1. Why Option B is Correct:** Circumferential full-thickness (third-degree) burns create a non-distensible, leathery **eschar**. As edema develops in the underlying tissues, the rigid eschar acts like a tourniquet, increasing interstitial pressure and compromising distal circulation (similar to compartment syndrome). **Escharotomy**—an incision through the eschar down to the subcutaneous fat—is the definitive emergency procedure to relieve this pressure and restore distal perfusion. **2. Why the Other Options are Incorrect:** * **Option A:** While IV access and fluids are vital, the statement regarding antibiotics is misleading. Prophylactic systemic antibiotics are **not** recommended for any burn patient (adult or child) as they do not prevent wound sepsis and instead promote the growth of resistant organisms. However, topical antibiotics (e.g., Silver Sulfadiazine) are standard care. * **Option C:** Moist dressings are generally avoided in large burns because they can cause **hypothermia** due to evaporative heat loss. The preferred initial management is covering the wound with a clean, dry sheet or non-adherent dressing. * **Option D:** The **Parkland Formula** calculates fluid requirements as **4 mL × kg body weight × % Total Body Surface Area (TBSA)** of Ringer’s Lactate. The value "8 mL/kg" is incorrect. **Clinical Pearls for NEET-PG:** * **Parkland Timing:** Give half of the calculated fluid in the first 8 hours (from the time of injury) and the remaining half over the next 16 hours. * **Urine Output:** The best indicator of adequate fluid resuscitation (Target: 0.5–1.0 mL/kg/hr in adults; 1.0 mL/kg/hr in children). * **Rule of 9s:** Remember that in children, the head is 18% and each leg is 14% (Lund-Browder chart is more accurate for pediatrics). * **Inhalation Injury:** Suspect if there are singed nasal hairs or carbonaceous sputum; the immediate priority is **early intubation**.

Question 125: What is the most common site of injury to the aorta in patients who manage to reach the hospital for medical care?

A. Ascending aorta
B. Aortic isthmus (Correct Answer)
C. Descending thoracic aorta
D. Abdominal aorta

Explanation: **Explanation:** Traumatic Aortic Disruption (TAD) is a life-threatening injury typically caused by rapid deceleration (e.g., high-speed motor vehicle accidents or falls from heights). **Why the Aortic Isthmus is correct:** The **aortic isthmus** is the segment of the aorta located just distal to the origin of the left subclavian artery, at the site of the **ligamentum arteriosum**. It is the most common site of injury (involved in >90% of cases) because it represents a transition zone between the mobile ascending aorta/arch and the fixed descending thoracic aorta (which is tethered to the posterior chest wall). During sudden deceleration, the heart and arch continue to move forward while the descending aorta remains fixed, creating a **shearing force** at the isthmus. **Analysis of Incorrect Options:** * **Ascending Aorta:** Injuries here are usually associated with penetrating trauma or high-velocity blunt impact to the sternum. These are often immediately fatal due to cardiac tamponade or involvement of the aortic valve. * **Descending Thoracic Aorta:** While the isthmus is technically the beginning of the descending aorta, distal descending injuries are less common as the vessel is relatively well-protected by the vertebral column and pleura. * **Abdominal Aorta:** This is the least common site for deceleration-induced blunt trauma; injuries here are more frequently due to direct penetrating trauma (stab/gunshot). **High-Yield Clinical Pearls for NEET-PG:** * **Survival Paradox:** While most patients die at the scene, those who reach the hospital alive usually have a **contained hematoma** by the adventitia. * **CXR Findings:** Look for a **widened mediastinum (>8 cm)**, obliteration of the aortic knob, and deviation of the nasogastric tube to the right. * **Gold Standard Investigation:** Contrast-enhanced CT (CECT) Chest or CT Angiography. * **Management:** Initial "anti-impulse" therapy (Beta-blockers to keep SBP <120 mmHg) followed by **TEVAR** (Thoracic Endovascular Aortic Repair), which is now preferred over open surgery.

Question 126: A 68-year-old hypertensive man undergoes successful repair of a ruptured abdominal aortic aneurysm. He receives 9 L Ringer's lactate solution and 4 units of whole blood during the operation. Two hours after transfer to the surgical intensive care unit, the following hemodynamic parameters are obtained: systemic blood pressure (BP) 90/60 mm Hg, pulse 110 beats per minute, central venous pressure (CVP) 7 mm Hg, pulmonary artery pressure 28/10 mm Hg, pulmonary capillary wedge pressure (PCWP) 8 mm Hg, cardiac output 1.9 L/min, systemic vascular resistance 1400 (dyne*s)/cm5 (normal is 900-1300), PaO2 140 mm Hg (FiO2: 0.45), urine output 15 mL/h (specific gravity: 1.029), and hematocrit 35%. Given this data, which of the following is the most appropriate next step in management?

A. Administration of a diuretic to increase urine output
B. Administration of a vasopressor agent to increase systemic blood pressure
C. Administration of a fluid challenge to increase urine output (Correct Answer)
D. Administration of a vasodilating agent to decrease elevated systemic vascular resistance

Explanation: ### Explanation The patient is presenting with postoperative **hypovolemic shock** despite receiving significant intraoperative fluids. The key to solving this question lies in interpreting the hemodynamic parameters and the markers of organ perfusion. **1. Why Option C is Correct:** The patient exhibits signs of inadequate tissue perfusion: hypotension (90/60 mmHg), tachycardia (110 bpm), low cardiac output (1.9 L/min), and oliguria (15 mL/h). * **Low Filling Pressures:** Both the CVP (7 mm Hg) and PCWP (8 mm Hg) are at the lower end of the normal range (Normal PCWP: 8–12 mm Hg). In a postoperative patient who has undergone major vascular surgery, these values indicate **relative hypovolemia**. * **Renal Response:** The high urine specific gravity (1.029) confirms that the kidneys are concentrating urine in response to volume depletion (pre-renal state), rather than failing due to intrinsic damage. * **Compensatory SVR:** The elevated SVR (1400) is a physiological response to maintain BP in the face of low cardiac output. Therefore, a **fluid challenge** is the most appropriate next step to increase preload, stroke volume, and subsequent cardiac output. **2. Why Other Options are Incorrect:** * **Option A:** Diuretics are contraindicated in a hypovolemic patient. Increasing urine output at the expense of intravascular volume would worsen the hypotension and could precipitate acute tubular necrosis (ATN). * **Option B:** Vasopressors increase SVR. Since the SVR is already high, adding a vasopressor would further increase afterload and decrease cardiac output, potentially causing myocardial ischemia. * **Option D:** While SVR is high, it is a compensatory mechanism. Vasodilators would cause a catastrophic drop in blood pressure because the primary problem is low "tank" volume (preload), not high resistance. ### NEET-PG Clinical Pearls * **PCWP** is the most accurate bedside reflection of left ventricular end-diastolic volume (preload). * **Oliguria Definition:** Urine output < 0.5 mL/kg/h. In a pre-renal state, specific gravity is typically > 1.020 and Urinary Sodium < 20 mEq/L. * **Ruptured AAA Post-op:** These patients often experience "third-spacing" and require massive fluid resuscitation due to systemic inflammatory response syndrome (SIRS). * **Goal of Fluid Challenge:** To increase the PCWP by 2–4 mm Hg and observe for clinical improvement (increased BP and urine output).

Question 127: Early stage of trauma is characterized by which metabolic process?

A. Catabolism (Correct Answer)
B. Anabolism
C. Glycogenesis
D. Lipogenesis

Explanation: The metabolic response to trauma is classically divided into two phases: the **Ebb phase** (early/shock phase) and the **Flow phase** (hypermetabolic phase). ### Why Catabolism is Correct In the early stages following trauma, the body initiates a systemic stress response to mobilize energy for survival and repair. This is characterized by **Catabolism**—the breakdown of complex molecules into simpler ones. * **Hormonal Drive:** There is a surge in "stress hormones" (Catecholamines, Cortisol, and Glucagon) and a relative resistance to Insulin. * **Processes:** This leads to rapid **Glycogenolysis** (breakdown of glycogen), **Proteolysis** (breakdown of skeletal muscle protein to provide amino acids for gluconeogenesis), and **Lipolysis** (breakdown of fats). * **Goal:** The primary objective is to maintain blood glucose levels for vital organs (brain and heart) and provide substrates for wound healing. ### Why Other Options are Incorrect * **Anabolism:** This is the "building up" phase. It occurs much later during the **Recovery/Convalescent phase**, where the body restores protein stores and fat reserves. * **Glycogenesis:** This is the formation of glycogen from glucose (storage). In trauma, the body does the opposite (Glycogenolysis) to increase available blood sugar. * **Lipogenesis:** This is the synthesis of fatty acids for storage. Trauma triggers **Lipolysis** to utilize fat as an alternative energy source. ### NEET-PG High-Yield Pearls * **The Ebb Phase:** Occurs in the first 24–48 hours. Characterized by decreased cardiac output, decreased oxygen consumption, and hypothermia. * **The Flow Phase:** Follows the Ebb phase. Characterized by hypermetabolism, increased CO2 production, and negative nitrogen balance. * **Negative Nitrogen Balance:** A hallmark of the post-traumatic catabolic state due to excessive protein breakdown and nitrogen excretion in urine. * **Hyperglycemia:** Common in trauma due to increased gluconeogenesis and peripheral insulin resistance (Stress Diabetes).

Question 128: A history of lucid interval is characteristic of which type of intracranial hemorrhage?

A. Epidural hematoma (EDH) (Correct Answer)
B. Subarachnoid hemorrhage (SAH)
C. Intracerebral hemorrhage (ICH)
D. Rupture of an intracranial aneurysm

Explanation: **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).

Question 129: Seat belt injury commonly involves which of the following?

A. Spleen
B. Mesentery (Correct Answer)
C. Femoral artery
D. Abdominal aorta

Explanation: ### 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.

Question 130: Curling's ulcer is typically seen if the burn area is more than what percentage of the total body surface area?

A. 35% (Correct Answer)
B. 45%
C. 55%
D. 65%

Explanation: **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).

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