Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 541: A transverse fracture of the maxilla is classified as which type of fracture?

A. Le Fort I (Correct Answer)
B. Le Fort II
C. Le Fort III
D. Craniofacial disruption

Explanation: **Explanation:** Le Fort fractures are the standard classification for midface injuries, categorized based on the lines of weakness in the facial skeleton. **1. Why Le Fort I is correct:** Le Fort I, also known as a **Guerin fracture** or **transverse maxillary fracture**, occurs horizontally across the maxilla, superior to the alveolar process. The fracture line passes through the nasal septum, the maxillary sinuses, and the pterygoid plates. This results in a "floating palate," where the upper teeth and palate are mobile relative to the rest of the face. **2. Analysis of Incorrect Options:** * **Le Fort II (Pyramidal Fracture):** This fracture is triangular or pyramidal in shape. The fracture line extends through the nasal bones, maxillary sinuses, and the infraorbital rim. It involves the bridge of the nose. * **Le Fort III (Craniofacial Disjunction):** This is the most severe type, where the entire midface is separated from the cranial base. The fracture line passes through the zygomatic arches, orbits, and ethmoid bone, leading to a "dish-face" deformity. * **Craniofacial Disruption:** This is a general descriptive term often used interchangeably with Le Fort III, but it is not the specific anatomical classification for a simple transverse maxillary fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Pterygoid Plate Involvement:** All three Le Fort fractures must involve the pterygoid plates to be classified as such. * **Clinical Sign:** To differentiate these bedside, grasp the hard palate and move it. If only the teeth move, it is Le Fort I; if the nose moves, it is Le Fort II; if the entire face (including zygomas) moves, it is Le Fort III. * **CSF Rhinorrhea:** Most commonly associated with Le Fort II and III due to involvement of the ethmoid bone/cribriform plate.

Question 542: All of the following are causes of death in burn patients except?

A. ARDS
B. Shock
C. Sepsis
D. Hyperkalemia (Correct Answer)

Explanation: **Explanation:** In burn management, understanding the timeline of complications is crucial for NEET-PG. While electrolyte imbalances occur, **Hyperkalemia** is generally a transient finding rather than a primary cause of death. **Why Hyperkalemia is the correct answer:** Immediately following a major burn, cell lysis leads to a release of intracellular potassium, causing a transient rise. However, once fluid resuscitation begins, the combination of massive fluid shifts, renal clearance (if kidneys are functional), and the subsequent "diuretic phase" often leads to **Hypokalemia**. While severe hyperkalemia can cause arrhythmias, it is rarely the terminal event in burns compared to systemic failure or infection. **Analysis of Incorrect Options:** * **Shock (Hypovolemic):** This is the **most common cause of death in the first 48 hours** (Resuscitative phase). Increased capillary permeability leads to "Burn Shock." * **Sepsis:** This is the **most common cause of death overall** and the leading cause after the first 48–72 hours (Septic phase). *Pseudomonas aeruginosa* and *Staphylococcus aureus* are frequent culprits. * **ARDS:** Inhalation injury and systemic inflammatory response syndrome (SIRS) often lead to Acute Respiratory Distress Syndrome, a major contributor to mortality in the ICU setting. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death (<48 hrs):** Hypovolemic Shock. * **Most common cause of death (>48 hrs):** Sepsis/Multiorgan Failure. * **Fluid of Choice:** Ringer’s Lactate (Parkland Formula: 4ml × kg × %TBSA). * **Inhalation Injury:** Suspect if there are singed nasal hairs or carbonaceous sputum; it significantly increases the risk of ARDS and mortality. * **Curling’s Ulcer:** Acute stress ulcer in the stomach/duodenum associated with severe burns.

Question 543: In severe injury, which of the following is the first priority to be maintained?

A. Hypotension
B. Dehydration
C. Airway (Correct Answer)
D. Cardiac status

Explanation: **Explanation:** In the management of a trauma patient, the primary objective is to address life-threatening conditions in a specific, prioritized sequence. This is governed by the **ATLS (Advanced Trauma Life Support) protocol**, which follows the **ABCDE mnemonic**. **1. Why Airway is the Correct Answer:** The **Airway (with cervical spine protection)** is the first and most critical priority ('A' in ABCDE). Without a patent airway, oxygenation cannot occur, leading to rapid irreversible brain damage and death within minutes. Maintaining airway patency ensures that subsequent steps, like ventilation and circulation management, are effective. **2. Analysis of Incorrect Options:** * **Hypotension (Circulation):** While managing shock and maintaining blood pressure is vital, it falls under 'C' (Circulation). Circulation cannot be effectively managed if the patient is hypoxic due to an obstructed airway. * **Dehydration:** This is a subset of fluid management within 'Circulation.' In acute trauma, we focus on hemorrhagic shock rather than simple dehydration. * **Cardiac Status:** While cardiac monitoring is essential, it is secondary to ensuring the patient can breathe. Even a functioning heart cannot sustain life without oxygenated blood. **Clinical Pearls for NEET-PG:** * **The "Golden Hour":** The first hour after injury where prompt intervention significantly reduces mortality. * **Vocalizing:** If a trauma patient can speak clearly, the airway is currently patent. * **Cervical Spine:** Always assume a C-spine injury in any blunt trauma above the clavicle; maintain neutral immobilization while managing the airway. * **Definitive Airway:** A cuffed tube in the trachea (Endotracheal Intubation) is the gold standard for airway protection.

Question 544: Regarding high-voltage electrical burns to an extremity, what is indicated?

A. Injuries are generally more superficial than those of thermal burns
B. Intravenous fluid replacement is based on the percentage of body surface area burned
C. Antibiotic prophylaxis is not required
D. Evaluation for fracture of the other extremities and visceral injury is indicated (Correct Answer)

Explanation: ### Explanation **Correct Option: D** High-voltage electrical injuries (>1000V) are multisystem traumas. The massive tetanic muscle contractions triggered by the current can lead to **avulsion fractures** or long bone fractures (commonly the humerus). Furthermore, the "entry and exit" nature of the current means it travels through internal tissues, potentially causing **visceral injuries** (e.g., bowel perforation, cardiac arrhythmias, or gallbladder necrosis) and occult deep tissue damage that is not visible on the skin surface. **Why other options are incorrect:** * **Option A:** Electrical burns are typically **deeper** than thermal burns. They follow the "iceberg effect," where minimal skin damage hides extensive underlying muscle and soft tissue necrosis due to the high resistance of bone and deep tissues. * **Option B:** The standard **Parkland Formula is unreliable** in high-voltage burns because the visible Body Surface Area (BSA) does not reflect the true extent of deep tissue destruction. Fluid resuscitation must be titrated to maintain a higher urine output (75–100 mL/hr) to prevent acute tubular necrosis from **myoglobinuria**. * **Option C:** Prophylaxis is essential. High-voltage injuries result in significant dead muscle (clostridial risk), making **Tetanus prophylaxis** and often systemic antibiotics mandatory. **High-Yield Clinical Pearls for NEET-PG:** * **Iceberg Effect:** The hallmark of electrical burns; deep tissue damage exceeds skin damage. * **Most Common Arrhythmia:** Atrial fibrillation (though Ventricular Fibrillation is the most common cause of immediate death). * **Renal Protection:** If myoglobinuria is present, use **Mannitol** and **Sodium Bicarbonate** (to alkalize urine) to prevent pigment-induced nephropathy. * **Surgical Emergency:** High-voltage injuries often require early **fasciotomy** due to compartment syndrome from deep muscle edema.

Question 545: Which of the following findings indicates hypoperfusion?

A. Systolic BP < 90 mm Hg
B. Lactic acidosis
C. Oliguria
D. All of the above (Correct Answer)

Explanation: **Explanation:** Hypoperfusion is defined as a state where the delivery of oxygenated blood is insufficient to meet the metabolic demands of tissues. It is the hallmark of shock. 1. **Systolic BP < 90 mm Hg:** While the body initially uses compensatory mechanisms (like tachycardia and vasoconstriction) to maintain blood pressure, a drop in systolic BP below 90 mm Hg (or a 40 mm Hg drop from baseline) is a classic clinical sign of **decompensated shock** and systemic hypoperfusion. 2. **Lactic Acidosis:** When tissues do not receive enough oxygen (hypoperfusion), cells shift from aerobic to **anaerobic metabolism**. This results in the production of lactate. A serum lactate level >2 mmol/L is a sensitive biochemical marker of occult tissue hypoxia. 3. **Oliguria:** The kidneys are highly sensitive to changes in perfusion. Hypoperfusion leads to decreased renal blood flow and a lower Glomerular Filtration Rate (GFR). Oliguria (urine output <0.5 mL/kg/hr in adults) is a key clinical indicator of end-organ dysfunction due to poor perfusion. **Why "All of the above" is correct:** Hypoperfusion is a multisystemic phenomenon. It manifests clinically through vital signs (hypotension), end-organ function (oliguria/altered mental status), and biochemical markers (lactic acidosis). Therefore, all three findings are valid indicators. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of shock:** Tachycardia (except in neurogenic shock where bradycardia occurs). * **Best indicator of resuscitation adequacy:** Normalization of serum lactate levels and base deficit. * **Shock Index:** Heart Rate / Systolic BP (Normal: 0.5–0.7). An index >0.9 suggests significant hypoperfusion even if BP is "normal." * **Narrow Pulse Pressure:** Often precedes a drop in systolic BP in hemorrhagic shock.

Question 546: The roof of the orbit is fractured due to which of the following mechanisms?

A. Blow on the forehead
B. Blow on the lower jaw
C. Fall on the back of the head (Correct Answer)
D. Blow in the parietal region

Explanation: ### Explanation **1. Why "Fall on the back of the head" is correct:** Fractures of the orbital roof are unique because they are frequently caused by **indirect trauma** transmitted through the skull base. When a person falls on the back of the head (occipital region), the impact force is transmitted forward along the base of the skull. The roof of the orbit is composed of the orbital plate of the frontal bone and the lesser wing of the sphenoid, which are structurally thin. The "contre-coup" mechanism or the transmission of kinetic energy through the rigid cranial vault causes the thin orbital roof to buckle or fracture, even if the primary impact was posterior. **2. Analysis of Incorrect Options:** * **A. Blow on the forehead:** This typically results in a fracture of the anterior wall of the frontal sinus or the supraorbital rim. While it can involve the roof, it is a direct mechanism rather than the classic indirect mechanism associated with skull base transmission. * **B. Blow on the lower jaw:** Force from the mandible is usually transmitted to the condyle and the glenoid fossa of the temporal bone. If severe, it may lead to middle cranial fossa fractures, but rarely involves the orbital roof. * **C. Blow in the parietal region:** This usually results in linear vault fractures or middle meningeal artery injury (epidural hematoma). The force is not directed along the axis required to fracture the orbital roof. **3. Clinical Pearls for NEET-PG:** * **Blow-out Fracture:** Most commonly involves the **orbital floor** (weakest part: medial to the infraorbital canal) due to a direct blow to the globe (e.g., a tennis ball). * **Clinical Sign:** Orbital roof fractures can present with **pulsatile exophthalmos** (if there is a dural tear) and **Panda eyes** (periorbital ecchymosis without subconjunctival hemorrhage's posterior limit). * **Nerve Involvement:** Fractures involving the superior orbital fissure (at the back of the roof) can lead to **Superior Orbital Fissure Syndrome**, affecting CN III, IV, V1, and VI.

Question 547: A 20-year-old male patient presents following a road traffic accident with a pulse of 100/minute, BP of 100/70 mmHg, and a respiratory rate of 21/minute. Paradoxical chest movement is observed during respiration. What is the most likely diagnosis?

A. Flail chest (Correct Answer)
B. Tension pneumothorax
C. Sucking chest wound
D. Hemothorax

Explanation: **Explanation:** The hallmark of this clinical presentation is **paradoxical chest movement**, which is the pathognomonic sign of **Flail Chest**. **1. Why Flail Chest is Correct:** Flail chest occurs when a segment of the thoracic cage loses bony continuity with the rest of the chest wall. This is defined anatomically as **fractures of 3 or more adjacent ribs in 2 or more places**. During inspiration, the negative intrathoracic pressure causes the detached (flail) segment to move inward, while during expiration, it moves outward—the opposite of normal chest wall mechanics. This "paradoxical" motion leads to ineffective ventilation and is often associated with underlying pulmonary contusion. **2. Why Other Options are Incorrect:** * **Tension Pneumothorax:** Presents with respiratory distress, tracheal deviation to the opposite side, absent breath sounds, and hemodynamic instability (obstructive shock). It does not cause paradoxical movement. * **Sucking Chest Wound (Open Pneumothorax):** Occurs due to a large defect in the chest wall. While it causes respiratory distress, the classic sign is air "hissing" through the wound, not paradoxical motion of a rib segment. * **Hemothorax:** Characterized by dullness on percussion and decreased breath sounds due to blood in the pleural cavity. It is a restrictive pathology without the specific segmental instability seen here. **Clinical Pearls for NEET-PG:** * **Management:** The primary goal is adequate oxygenation, humidified air, and **aggressive pain control** (often via epidural analgesia) to prevent splinting and atelectasis. * **Internal Stabilization:** Most cases are managed conservatively; however, mechanical ventilation provides "internal pneumatic stabilization" if respiratory failure develops. * **Associated Injury:** The most serious consequence of flail chest is not the rib fractures themselves, but the underlying **pulmonary contusion**.

Question 548: In a fracture of the penis involving rupture of the tunica albuginea with intact Busch's fascia, which of the following would be noted clinically?

A. Hematoma involving only the shaft of the penis (Correct Answer)
B. Hematoma involving the scrotum and perineal region
C. Hematoma in the penis, scrotum, and abdominal wall
D. Hematoma in the penis, scrotum, and thigh

Explanation: ### **Explanation** The clinical presentation of a penile fracture (rupture of the **tunica albuginea**) is dictated by the integrity of **Buck’s fascia** (deep fascia of the penis). **1. Why Option A is Correct:** The tunica albuginea is the tough fibrous layer surrounding the corpora cavernosa. When it ruptures, blood escapes from the cavernous tissue. If **Buck’s fascia remains intact**, the extravasated blood is confined beneath it. Because Buck’s fascia is limited to the penile shaft, the resulting hematoma is restricted to the penis, often causing the characteristic "eggplant deformity." **2. Why Other Options are Incorrect:** * **Options B, C, and D:** These scenarios occur only if **Buck’s fascia is also ruptured**. If Buck’s fascia is breached, blood and urine (if the urethra is involved) can track into the space between Colles' fascia and the underlying muscles. * **Colles' fascia** is continuous with **Scarpa’s fascia** of the abdominal wall and the **dartos muscle/fascia** of the scrotum. * Therefore, a rupture of Buck’s fascia leads to a "butterfly-shaped" hematoma/ecchymosis involving the **scrotum, perineum, and lower abdominal wall**. * **Option D** is incorrect because Colles' fascia is firmly attached to the **fascia lata** of the thigh, preventing the hematoma from spreading into the thighs. ### **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Most commonly occurs during vigorous sexual intercourse (the penis "slips" and strikes the pubic symphysis). * **Clinical Triad:** Sudden "snapping" sound, immediate detumescence (loss of erection), and rapid swelling/discoloration. * **Diagnosis:** Primarily clinical. If the diagnosis is doubtful, **Retrograde Urethrography (RUG)** is the investigation of choice to rule out urethral injury (present in ~20% of cases). * **Management:** Immediate **surgical exploration and repair** of the tunica albuginea tear is the gold standard to prevent permanent erectile dysfunction or chordee.

Question 549: Subdural hematoma most commonly results from?

A. Rupture of intracranial aneurysm
B. Rupture of cerebral arteriovenous malformation
C. Injury to cortical bridging veins (Correct Answer)
D. Hemophilia

Explanation: **Explanation:** **Subdural Hematoma (SDH)** occurs due to the accumulation of blood in the potential space between the dura mater and the arachnoid mater. 1. **Why Option C is Correct:** The primary mechanism of SDH is the **tearing of cortical bridging veins** as they traverse the subdural space to drain into the dural venous sinuses (e.g., Superior Sagittal Sinus). These veins are particularly vulnerable to **shearing forces** during sudden acceleration-deceleration injuries. In elderly patients or those with chronic alcoholism, cerebral atrophy stretches these veins, making them susceptible to rupture even with minor trauma. 2. **Why Other Options are Incorrect:** * **Option A & B:** Rupture of an intracranial aneurysm or arteriovenous malformation (AVM) typically results in a **Subarachnoid Hemorrhage (SAH)**, characterized by blood in the CSF-filled space between the arachnoid and pia mater ("thunderclap headache"). * **Option D:** While hemophilia is a bleeding diathesis that can predispose a patient to intracranial bleeds, it is a systemic risk factor rather than the direct anatomical cause of the hematoma. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** On CT, SDH appears as a **Crescent-shaped (concave)** hyperdensity that **can cross suture lines** (unlike Epidural Hematoma). * **Chronic SDH:** Common in elderly; presents with fluctuating levels of consciousness and progressive dementia-like symptoms weeks after minor trauma. * **Epidural Hematoma (EDH):** Usually due to injury to the **Middle Meningeal Artery**; characterized by a "Lucid Interval" and a biconvex (lens-shaped) appearance on CT. * **Management:** Surgical evacuation (Burr hole or Craniotomy) is indicated if there is a significant midline shift (>5mm) or neurological deterioration.

Question 550: When is emergency endotracheal intubation indicated?

A. Glasgow Coma Scale (GCS) less than 7 (Correct Answer)
B. Tension pneumothorax
C. Cardiac tamponade
D. Bleeding gastric ulcer

Explanation: **Explanation:** The primary indication for emergency endotracheal intubation in trauma is the **protection of the airway**. According to ATLS (Advanced Trauma Life Support) guidelines, a patient with a **Glasgow Coma Scale (GCS) score of 8 or less** requires definitive airway management. A GCS < 8 (often remembered by the mnemonic *"8, terminate/intubate"*) indicates that the patient is unable to maintain airway patency or protect against aspiration due to depressed protective reflexes (gag and cough). Option A (GCS < 7) falls within this critical threshold, making it the most appropriate indication among the choices. **Analysis of Incorrect Options:** * **Tension Pneumothorax:** This is a clinical diagnosis requiring immediate **needle decompression** (at the 5th intercostal space, mid-axillary line) followed by a tube thoracostomy. Intubation is not the primary treatment and can actually worsen the condition by increasing intra-thoracic pressure. * **Cardiac Tamponade:** The definitive management is **pericardiocentesis** or a pericardial window. While hemodynamic support is needed, intubation is not the specific emergency intervention for the tamponade itself. * **Bleeding Gastric Ulcer:** Management involves resuscitation and endoscopic intervention (hemostasis). Intubation is only indicated if there is massive hematemesis causing airway compromise or if the patient is hemodynamically unstable/unconscious. **High-Yield Clinical Pearls for NEET-PG:** * **Definitive Airway:** Defined as a cuffed tube in the trachea (Endotracheal tube or Surgical airway). * **GCS Threshold:** GCS ≤ 8 is the standard indication for intubation in head injury. * **Other Indications:** Massive facial fractures, risk of aspiration (vomiting/bleeding), or impending airway obstruction (inhalation burns). * **Gold Standard for Airway:** Orotracheal intubation is the preferred route in trauma. If intubation fails, a surgical cricothyroidotomy is the next step.

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