Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 311: USG FAST does not involve scanning of which region from the following?

A. Pericardial
B. Pleural (Correct Answer)
C. Pelvic
D. Hepatic

Explanation: **Explanation:** The **FAST (Focused Assessment with Sonography for Trauma)** exam is a rapid bedside ultrasound screening test used in trauma settings to identify free fluid (usually blood) in the peritoneal, pericardial, or pleural spaces. **Why B is the Correct Answer:** The standard FAST exam focuses on four specific areas to detect **intraperitoneal** and **pericardial** fluid. While the **eFAST (Extended FAST)** includes the pleural space to look for pneumothorax and hemothorax, the traditional **FAST** exam does not. Therefore, in the context of a standard FAST protocol, the pleural space (specifically for pneumothorax) is the "odd one out." **Analysis of Options:** * **A. Pericardial:** Scanned via the subxiphoid view to rule out cardiac tamponade. * **C. Pelvic:** Scanned via the suprapubic view (Pouch of Douglas in females/retrovesical space in males) to detect dependent pelvic fluid. * **D. Hepatic:** Refers to the Right Upper Quadrant (RUQ) view, specifically **Morison’s Pouch** (hepatorenal recess), which is the most sensitive area for detecting intraperitoneal fluid. **High-Yield Clinical Pearls for NEET-PG:** * **Standard FAST Views (4):** 1. Subxiphoid (Pericardial), 2. RUQ (Hepatorenal), 3. LUQ (Splenorenal), 4. Suprapubic (Pelvic). * **eFAST:** Adds bilateral anterior thoracic views to detect **Pneumothorax** (loss of lung sliding) and **Hemothorax**. * **Sensitivity:** FAST is highly specific but lacks sensitivity for **retroperitoneal bleeds**, hollow viscus injury, and diaphragmatic tears. * **Prerequisite:** A minimum of **200–250 ml** of fluid is typically required for detection on FAST. * **Gold Standard:** For hemodynamically stable patients with blunt trauma, CT scan remains the gold standard. FAST is the investigation of choice for **hemodynamically unstable** patients.

Question 312: Which one of the following is not a type of skull fracture?

A. Simple linear
B. Depressed
C. Diffuse axonal (Correct Answer)
D. Basal skull

Explanation: ### Explanation The core concept in this question is the distinction between **structural (focal) injuries** and **functional (diffuse) injuries** of the brain. **Why "Diffuse Axonal" is the correct answer:** Diffuse Axonal Injury (DAI) is a type of **traumatic brain injury (TBI)** involving the brain parenchyma itself, not the skull. It occurs due to high-velocity rotational acceleration-deceleration forces that cause "shearing" of axons at the gray-white matter junction. It is a clinical-radiological diagnosis (often seen as punctate hemorrhages on MRI) and is not a fracture of the bone. **Analysis of incorrect options (Types of Skull Fractures):** * **Simple Linear:** The most common type of skull fracture. It is a break in the cranial bone that resembles a line, without splintering, depression, or distortion of the bone. * **Depressed:** A fracture where fragments of the skull are driven inward (at least the thickness of the skull) toward the brain parenchyma. These often require surgical elevation if they are open or causing neurological deficits. * **Basal Skull:** A fracture involving the base of the skull (cribriform plate, temporal bone, or occipital bone). It is diagnosed clinically by signs like Battle’s sign or Raccoon eyes. **NEET-PG High-Yield Pearls:** * **DAI Diagnosis:** MRI (specifically **Susceptibility Weighted Imaging - SWI**) is the investigation of choice, as CT scans are often normal despite the patient being in a deep coma. * **Basal Skull Fracture Signs:** * **Battle’s Sign:** Post-auricular ecchymosis (mastoid process). * **Raccoon Eyes:** Periorbital ecchymosis (anterior cranial fossa fracture). * **Halo Sign:** Used to detect CSF rhinorrhea/otorrhea. * **Pond Fracture:** A specific type of depressed fracture seen in infants (greenstick-like).

Question 313: What is the primary treatment for hemorrhagic shock?

A. Crystalloid solutions (Correct Answer)
B. Colloid solutions
C. Packed red blood cells
D. Fresh frozen plasma

Explanation: **Explanation:** The primary goal in the initial management of hemorrhagic shock is the restoration of intravascular volume to maintain organ perfusion. According to **ATLS (Advanced Trauma Life Support) guidelines**, the first-line treatment for fluid resuscitation is the administration of **isotonic crystalloids**, specifically **Ringer’s Lactate (RL)** or Normal Saline. * **Why Crystalloids?** They are readily available, inexpensive, and effective for initial volume expansion. Ringer’s Lactate is often preferred over Normal Saline to avoid hyperchloremic metabolic acidosis. The standard initial bolus is **1 liter for adults** (or 20 ml/kg for pediatrics). **Analysis of Incorrect Options:** * **Colloid solutions:** These (e.g., albumin, starches) are not superior to crystalloids in trauma settings and are significantly more expensive. Some synthetic colloids can also interfere with coagulation and renal function. * **Packed Red Blood Cells (PRBCs):** While essential for replacing oxygen-carrying capacity in severe hemorrhage (Class III and IV shock), they are not the *initial* step. Blood products are initiated if the patient is a "non-responder" or "transient responder" to the initial crystalloid bolus. * **Fresh Frozen Plasma (FFP):** FFP is used to manage coagulopathy but is not used for primary volume resuscitation. In massive transfusion protocols, it is given in a 1:1:1 ratio with PRBCs and platelets. **Clinical Pearls for NEET-PG:** * **Definition of Shock:** Inadequate tissue perfusion leading to cellular hypoxia. * **Lethal Triad of Trauma:** Acidosis, Hypothermia, and Coagulopathy. * **Permissive Hypotension:** In penetrating trauma (without head injury), fluid resuscitation is sometimes limited to maintain a lower-than-normal BP (MAP ~65 mmHg) to prevent "popping the clot" until surgical control is achieved. * **Best indicator of resuscitation:** Urine output (0.5 ml/kg/hr in adults).

Question 314: What is the recommended management for a fracture of the mandible in the canine region in a 6-year-old child?

A. Cap splint fixation (Correct Answer)
B. Intermaxillary fixation
C. Risdon wiring
D. Transosseous wiring

Explanation: ### Explanation The management of mandibular fractures in children (pediatric mandible) differs significantly from adults due to the presence of **developing tooth buds** and the rapid rate of bone healing. **Why Cap Splint Fixation is Correct:** In a 6-year-old child, the mandible contains permanent tooth buds (mixed dentition stage). **Cap splints** (acrylic or metal) are the preferred treatment because they are non-invasive to the bone. They are fabricated on a model of the patient's arch and cemented onto the existing teeth. This provides stable fixation without the risk of injuring the underlying permanent tooth follicles or interfering with the growth centers of the jaw. **Analysis of Incorrect Options:** * **Intermaxillary Fixation (IMF):** This is difficult in children because primary teeth have shallow, resorbing roots and a tapered shape, making them poor anchors for eyelet wires or arch bars. Furthermore, prolonged immobilization can lead to temporomandibular joint (TMJ) ankylosis in children. * **Risdon Wiring:** This is a form of horizontal wiring used to create an arch bar effect. Like IMF, it relies on stable dentition, which is lacking in the mixed dentition phase, and risks damaging the gingival tissues. * **Transosseous Wiring/ORIF:** Open reduction with internal fixation (plates/wires) is generally avoided in children unless the fracture is severely displaced. Drilling holes for wires or screws carries a high risk of **permanent damage to the developing tooth buds**. **Clinical Pearls for NEET-PG:** * **Most common site** of mandibular fracture in children: **Condyle** (often managed conservatively). * **Growth Disturbance:** The primary concern in pediatric mandibular trauma is damage to the condylar growth center, which can lead to facial asymmetry or ankylosis. * **Healing Time:** Pediatric fractures heal rapidly (usually within 2–3 weeks); therefore, any fixation must be removed early to prevent restricted jaw growth.

Question 315: Which of the following is not a hard sign of arterial injury?

A. Expanding or pulsatile hematoma
B. Arterial bleeding
C. Shock (Correct Answer)
D. Bruit

Explanation: In the evaluation of vascular trauma, clinical signs are categorized into **Hard Signs** (highly predictive of arterial injury requiring immediate intervention) and **Soft Signs** (suggestive of injury requiring further diagnostic workup). ### **Why "Shock" is the Correct Answer** **Shock** is considered a **Soft Sign** of arterial injury. While shock can occur due to massive hemorrhage from an artery, it is non-specific. In a trauma setting, shock can result from multiple other causes such as tension pneumothorax, cardiac tamponade, or internal bleeding from solid organ injuries (spleen/liver). Therefore, its presence does not definitively confirm a localized arterial injury. ### **Explanation of Incorrect Options (Hard Signs)** The following are classic **Hard Signs** of vascular injury: * **Arterial Bleeding (B):** Active, pulsatile, or "spurting" hemorrhage is a definitive indicator of a transected or lacerated artery. * **Expanding or Pulsatile Hematoma (A):** This indicates an ongoing leak from a major vessel into the surrounding tissue, often associated with a false aneurysm. * **Bruit or Thrill (D):** A palpable thrill or audible bruit over the site of injury is pathognomonic for an acute arteriovenous (AV) fistula. * **The 6 P’s of Ischemia:** Pulselessness, Pallor, Paresthesia, Pain, Paralysis, and Poikilothermia (cold limb) are also hard signs. ### **NEET-PG High-Yield Pearls** * **Management Rule:** If **Hard Signs** are present, the patient should be taken directly for **Emergency Surgical Exploration** without wasting time on imaging (unless the patient is multi-trauma and unstable). * **Soft Signs:** These include a history of moderate hemorrhage, diminished (but present) pulses, a non-expanding hematoma, and proximity of the wound to a major vessel. * **Gold Standard Investigation:** For stable patients with soft signs, **CT Angiography** is the investigation of choice. * **ABI:** An Ankle-Brachial Index of **< 0.9** is a significant soft sign indicating the need for further vascular imaging.

Question 316: A patient presents in the emergency department with a cervical spine fracture. What is the first priority in management?

A. Locate the fracture by shifting the patient side to side
B. Obtain an X-ray of the spine
C. Clear the airway and intubate the patient
D. Immobilize the cervical spine (Correct Answer)

Explanation: **Explanation:** In the management of trauma patients, the primary goal is to prevent secondary injury. When a cervical spine (C-spine) fracture is suspected, the **first priority is immobilization** to prevent further displacement of vertebral fragments, which could lead to irreversible spinal cord injury or permanent paralysis. **Why the correct answer is right:** According to ATLS (Advanced Trauma Life Support) guidelines, the management of a trauma patient follows the **ABCDE** protocol. However, in cases of suspected spinal injury, **"Airway with C-spine protection"** is the very first step. Immobilization using a rigid cervical collar, sandbags, and a backboard ensures the spine remains in a neutral position while life-saving interventions are performed. **Why the incorrect options are wrong:** * **Option A:** Shifting the patient side-to-side (log-rolling) should only be done *after* the spine is stabilized. Uncontrolled movement can cause transection of the spinal cord. * **Option B:** While imaging is necessary for diagnosis, it is a secondary step. "Treat the patient, not the X-ray." Stabilization must precede transport to the radiology suite. * **Option C:** Airway management is critical, but in a C-spine injury, intubation must be performed with **Manual Inline Stabilization (MILS)**. Attempting to intubate without first protecting/immobilizing the spine can cause hyperextension of the neck and worsen the injury. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for C-spine clearance:** Clinical assessment (NEXUS criteria/Canadian C-spine rule) followed by a **CT scan** (more sensitive than X-rays). * **MILS (Manual Inline Stabilization):** The technique used during intubation to keep the head and neck neutral. * **Neurogenic Shock:** Characterized by the triad of hypotension, **bradycardia**, and peripheral vasodilation (due to loss of sympathetic tone). * **Diaphragmatic Paralysis:** Occurs in injuries at or above **C3, C4, C5** ("keep the diaphragm alive").

Question 317: A dermoepidermal burn is classified as which degree of burn?

A. First degree
B. Second degree (Correct Answer)
C. Third degree
D. Fourth degree

Explanation: **Explanation:** The classification of burns is based on the depth of tissue involvement. A **dermoepidermal burn** involves both the epidermis and a portion of the underlying dermis, which corresponds to a **Second-degree burn**. * **Why Second-degree is correct:** These burns are divided into superficial partial-thickness (involving the papillary dermis) and deep partial-thickness (extending into the reticular dermis). Clinically, they are characterized by **blister formation**, extreme pain (as nerve endings are exposed), and a blanching, erythematous base. * **Why other options are wrong:** * **First-degree:** Only involves the **epidermis**. It presents with erythema and pain but no blisters (e.g., classic sunburn). * **Third-degree (Full-thickness):** Involves the **entire thickness of the dermis** and may reach the subcutaneous fat. These are typically painless (due to destroyed nerve endings) and appear leathery or charred. * **Fourth-degree:** Extends beyond the skin into underlying structures like **muscle, fascia, or bone**. **Clinical Pearls for NEET-PG:** 1. **Rule of Nines:** Used for rapid estimation of Total Body Surface Area (TBSA) in adults. Note that first-degree burns are **excluded** from TBSA calculations for fluid resuscitation. 2. **Parkland Formula:** $4 \text{ mL} \times \text{kg body weight} \times \% \text{ TBSA}$. Give half in the first 8 hours and the remainder over the next 16 hours. 3. **Jackson’s Thermal Zones:** The central area of maximum damage is the **Zone of Coagulation**, surrounded by the Zone of Stasis and the Zone of Hyperemia. 4. **Pain Paradox:** The deeper the burn (3rd/4th degree), the *less* painful it is because the sensory receptors are destroyed.

Question 318: A 33-year-old person involved in a motor vehicle accident develops an extradural hematoma. What is the most likely vessel to be bleeding?

A. Ophthalmic artery
B. Superior sagittal sinus
C. Occipital artery
D. Middle meningeal artery (Correct Answer)

Explanation: ### Explanation **Correct Option: D. Middle Meningeal Artery** An **Extradural Hematoma (EDH)** occurs when blood collects between the inner table of the skull and the dura mater. The most common cause is a blunt trauma to the **pterion** (the weakest point of the skull where the frontal, parietal, temporal, and sphenoid bones meet). The **Middle Meningeal Artery (MMA)**, a branch of the maxillary artery, runs directly deep to the pterion. A fracture in this region lacerates the artery, leading to rapid arterial bleeding that strips the dura away from the bone. **Analysis of Incorrect Options:** * **A. Ophthalmic artery:** This is a branch of the internal carotid artery supplying the eye and orbit; its injury does not typically result in an EDH. * **B. Superior sagittal sinus:** While venous dural sinuses can occasionally cause an EDH (especially in children or posterior fossa cases), they are much less common than arterial sources. Tearing of bridging veins typically leads to a *Subdural Hematoma (SDH)* [2], not an EDH. * **C. Occipital artery:** This is an extracranial branch of the external carotid artery supplying the scalp; it does not contribute to intracranial hematomas. **Clinical Pearls for NEET-PG:** * **Radiology:** EDH appears as a **biconvex (lentiform), hyperdense** [1] collection on CT that does *not* cross cranial sutures (as the dura is firmly attached there). * **Clinical Presentation:** Classically associated with a **"Lucid Interval"**—a period of temporary improvement in consciousness between the initial impact and subsequent neurological deterioration. * **Management:** Small, asymptomatic EDHs can be managed conservatively, but large or symptomatic clots require urgent **burr hole evacuation or craniotomy** [1].

Question 319: A 15-year-old boy sustains 20% total body surface area (TBSA) burns. After primary assessment, burn dressing with silver nitrate is applied on his wounds. Which of the following is associated with the use of silver nitrate?

A. Metabolic acidosis
B. Painful application
C. Boosts cell-mediated immunity
D. Has to be changed/wounds re-soaked every 2 to 4 hours (Correct Answer)

Explanation: **Explanation:** Silver nitrate (0.5% solution) is a classic topical antimicrobial used in burn management. The correct answer is **Option D** because silver nitrate is delivered in an aqueous solution that evaporates quickly. To maintain its antimicrobial efficacy and prevent the dressing from drying out (which would increase the concentration of silver to toxic levels), the dressings must be kept constantly moist by re-soaking them every 2 to 4 hours. **Analysis of Incorrect Options:** * **A. Metabolic acidosis:** Silver nitrate is actually associated with **metabolic alkalosis**. It is a hypotonic solution that leaches electrolytes (sodium, potassium, chloride, and magnesium) from the wound surface, leading to hyponatremia and hypochloremic alkalosis. (Note: *Mafenide acetate* is the agent associated with metabolic acidosis). * **B. Painful application:** Silver nitrate application is **painless**. In contrast, *Mafenide acetate* is notorious for causing a burning sensation upon application. * **C. Boosts cell-mediated immunity:** Silver nitrate has no such effect. In fact, it can be slightly cytotoxic to new epithelium and causes black staining of the tissues, which can interfere with the assessment of wound healing. **High-Yield Clinical Pearls for NEET-PG:** * **Silver Nitrate (0.5%):** Main side effects are **hyponatremia** and **black staining** of skin/linens. It does not penetrate eschar. * **Silver Sulfadiazine:** The most commonly used topical agent; can cause transient **neutropenia**. * **Mafenide Acetate:** Excellent eschar penetration (used in ear burns/cartilage); main side effect is **metabolic acidosis** (via carbonic anhydrase inhibition). * **Formula:** Remember that for silver nitrate, "Nitrate" starts with 'N', and it causes "Hyponatremia."

Question 320: Class III hemorrhage is defined as blood loss up to?

A. 500-750 ml
B. 750-1500 ml
C. 1500-2000 ml (Correct Answer)
D. >2000 ml

Explanation: The classification of hemorrhagic shock is a high-yield topic based on the **ATLS (Advanced Trauma Life Support)** guidelines. It categorizes blood loss into four stages based on physiological changes in a 70 kg adult. ### **Why Option C is Correct** **Class III Hemorrhage** represents a **30-40% blood loss**, which equates to **1500–2000 ml**. At this stage, compensatory mechanisms begin to fail. Key clinical markers include: * **Marked Tachycardia** (>120 bpm) and **Tachypnea** (30–40 bpm). * **Significant drop in Systolic Blood Pressure.** * **Altered Mental Status** (Anxious/Confused). * **Decreased Urine Output** (5–15 ml/hr). * **Management:** Usually requires blood transfusion along with crystalloids. ### **Analysis of Incorrect Options** * **Option A (500-750 ml):** This falls under **Class I Hemorrhage** (<15% loss). Vital signs remain stable, and the body compensates effectively. * **Option B (750-1500 ml):** This defines **Class II Hemorrhage** (15-30% loss). The hallmark is an increased pulse pressure and tachycardia, but systolic BP is usually maintained. * **Option D (>2000 ml):** This defines **Class IV Hemorrhage** (>40% loss). This is immediately life-threatening, characterized by severe hypotension, narrow pulse pressure, and negligible urine output. ### **NEET-PG High-Yield Pearls** * **Earliest Sign of Shock:** Tachycardia (except in patients on beta-blockers or with pacemakers). * **Earliest Indicator of Compensation:** Narrowing of Pulse Pressure (seen in Class II). * **Class III vs. IV:** Class III is the stage where **hypotension** typically first manifests. * **Fluid Resuscitation:** The current ATLS 10th edition emphasizes early use of blood and blood products rather than massive crystalloid infusion for Class III and IV.

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Trauma — MCQs

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