Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 681: A 43-year-old man presents to the emergency department with massive facial swelling, ecchymosis, and an elongated face after being hit in the face with a baseball bat. There is mobility of the middle third of the face on digital manipulation of the maxilla. What is the likely diagnosis?

A. Lambdoid injury
B. Odontoid fracture
C. LeFort III fracture (Correct Answer)
D. Palatal split

Explanation: ### Explanation **Correct Option: C. LeFort III fracture** The clinical presentation of **massive facial swelling**, **periorbital ecchymosis** (panda eyes), and an **elongated face** (dish-face deformity) following high-velocity blunt trauma is classic for a **LeFort III fracture**, also known as **Craniofacial Dysjunction**. In a LeFort III fracture, the entire middle third of the facial skeleton is separated from the cranial base. The fracture line passes through the nasofrontal suture, the orbit (medial wall, floor, and lateral wall), and the zygomaticofrontal suture. This results in the characteristic mobility of the entire midface when the maxilla is manipulated. The "elongated face" occurs because the midface drops downward and backward due to the pull of the pterygoid muscles and gravity. **Why other options are incorrect:** * **A. Lambdoid injury:** This refers to the lambdoid suture of the skull (posterior). It is associated with occipital trauma and would not cause midfacial mobility or an elongated face. * **B. Odontoid fracture:** This is a fracture of the C2 vertebra. While it is a serious trauma injury, it presents with neck pain and neurological deficits, not facial mobility. * **D. Palatal split:** This involves a sagittal fracture of the hard palate, usually associated with LeFort I or II fractures, but it does not account for the craniofacial dysjunction seen here. ### NEET-PG High-Yield Pearls: * **LeFort I (Guerin’s fracture):** Low-level horizontal fracture; only the **maxilla** is mobile (Floating palate). * **LeFort II (Pyramidal fracture):** Involves the nasal bones and infraorbital rim; the **maxilla and nose** move together. * **LeFort III (Craniofacial Dysjunction):** The **entire midface** (including zygomas) is mobile relative to the skull. * **Clinical Sign:** Always check for **CSF rhinorrhea** in LeFort II and III due to involvement of the ethmoid bone/cribriform plate. * **Imaging:** The gold standard for diagnosis is a **Non-Contrast CT (NCCT) of the face** with 3D reconstruction.

Question 682: In case of pelvic fracture with urethral injury, what is the most important first step in management?

A. Repair of the injured urethra
B. Fixation of pelvic fracture
C. Treatment of shock and haemorrhage (Correct Answer)
D. Splinting the urethra with catheters

Explanation: ### Explanation **1. Why "Treatment of shock and haemorrhage" is correct:** In any major trauma involving a pelvic fracture, the **ATLS (Advanced Trauma Life Support)** protocols dictate that life-threatening conditions must be addressed before limb- or organ-threatening ones. Pelvic fractures are frequently associated with massive retroperitoneal hemorrhage (often from the presacral venous plexus or internal iliac artery branches), which can lead to rapid exsanguination. Therefore, the immediate priority is **hemodynamic stabilization** (Airway, Breathing, and Circulation) to prevent death from hemorrhagic shock. **2. Why the other options are incorrect:** * **Repair of the injured urethra (Option A):** Urethral repair is never an emergency. Immediate primary repair is contraindicated in the acute phase as it increases the risk of impotence, incontinence, and stricture. * **Fixation of pelvic fracture (Option B):** While pelvic stabilization (e.g., pelvic binder or external fixator) is part of hemorrhage control, "treatment of shock" is the broader, more immediate clinical priority. Definitive internal fixation is a delayed procedure. * **Splinting the urethra with catheters (Option D):** In a suspected urethral injury (signaled by blood at the meatus), a blind urethral catheterization is **contraindicated** as it may convert a partial tear into a complete transection. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of Urethral Injury:** Blood at the external meatus, inability to void, and a palpable "high-riding" prostate on Digital Rectal Examination (DRE). * **Gold Standard Investigation:** Retrograde Urethrogram (RUG) is the investigation of choice to diagnose urethral injury. * **Initial Urological Management:** If the patient cannot void, the preferred initial management is a **Suprapubic Cystostomy (SPC)** to divert urine, followed by delayed repair (Urethroplasty) 3–6 months later. * **Most common site:** Posterior urethra (membranous part) is most commonly injured in pelvic fractures.

Question 683: Pediatric fracture of the mandible typically follows which pattern?

A. Downwards and forwards.
B. Downwards and backwards.
C. Zig-zag pattern due to the presence of tooth buds. (Correct Answer)
D. Comminuted fractures.

Explanation: **Explanation:** **Why Option C is Correct:** In pediatric patients, the mandible is highly cellular and contains numerous **developing permanent tooth buds** within the alveolar bone. These tooth buds act as areas of relative weakness and structural interruption. When a fracture occurs, the line of cleavage does not follow a straight path; instead, it tends to deviate around these follicles, resulting in a characteristic **"zig-zag" or "stair-step" pattern**. Additionally, the high elasticity of the pediatric bone and the thick periosteum often lead to "greenstick" fractures rather than complete displacements. **Analysis of Incorrect Options:** * **Options A and B:** These describe patterns of displacement rather than the intrinsic fracture line pattern. While the pull of the suprahyoid and pterygoid muscles can displace fragments, they do not define the pediatric-specific morphology of the break. * **Option D:** Comminuted fractures (multiple fragments) are rare in children because their bones are more resilient and flexible. Comminution is more typical of high-energy trauma in brittle, elderly bone. **High-Yield Clinical Pearls for NEET-PG:** * **Growth Center:** The **mandibular condyle** is the primary growth center. Fractures here in children can lead to future growth retardation and facial asymmetry (ankylosis). * **Most Common Site:** The **condyle** is the most common site of mandibular fracture in children (unlike adults, where the body/symphysis is more frequent). * **Management:** Conservative management is preferred. If surgery is needed, **resorbable plates** are used to avoid interfering with the developing dentition and future bone growth.

Question 684: In CPR, where are chest compressions performed?

A. On the upper part of the sternum
B. On the xiphoid process
C. On the middle of the lower part of the sternum (Correct Answer)
D. On the left side of the chest

Explanation: **Explanation:** The primary objective of chest compressions in CPR is to create a "cardiac pump" effect and increase intrathoracic pressure to maintain systemic circulation. According to the latest **AHA (American Heart Association) and ERC (European Resuscitation Council) guidelines**, the correct site for compressions is the **lower half of the sternum**. **Why Option C is correct:** The heart is located anatomically behind the lower half of the sternum. Compressing this specific area effectively squeezes the ventricles between the sternum and the vertebral column, maximizing stroke volume. It also provides a stable bony surface to apply the necessary force (5–6 cm depth in adults) without immediate structural collapse. **Analysis of Incorrect Options:** * **Option A (Upper Sternum):** Compressing the manubrium or upper sternum is ineffective as it is further from the cardiac chambers and requires significantly more force to depress due to the attachment of the first and second ribs. * **Option B (Xiphoid Process):** This is a high-risk area. The xiphoid is a fragile cartilaginous projection; pressure here can cause it to fracture and lacerate the underlying liver, stomach, or diaphragm. * **Option D (Left side of the chest):** While the heart is tilted to the left, the ribs are flexible and prone to multiple fractures if compressed directly. The sternum acts as a central "plunger" that distributes pressure more safely and effectively. **High-Yield Clinical Pearls for NEET-PG:** * **Hand Placement:** Place the heel of one hand on the lower half of the sternum, with the other hand on top. * **Compression Rate:** 100–120 compressions per minute. * **Compression Depth:** At least 2 inches (5 cm) but not more than 2.4 inches (6 cm). * **Recoil:** Allow for **complete chest recoil** after each compression to ensure adequate venous return and ventricular filling. * **Ratio:** 30:2 (Compressions to Breaths) in adults for both single and two-rescuer CPR.

Question 685: What is the most common site of a mandibular fracture?

A. Angle of the mandible
B. Condylar process (Correct Answer)
C. Coronoid process
D. Ramus

Explanation: The mandible is the most commonly fractured bone of the facial skeleton after the nasal bone. Understanding the distribution of these fractures is high-yield for NEET-PG. **Why Condylar Process is Correct:** The **condylar process** is the most common site of mandibular fracture (approx. 29–35%). This is due to a protective evolutionary mechanism: the condylar neck is thin and acts as a "safety valve." In the event of a severe blow to the chin, the condyle fractures and displaces, preventing the mandibular head from being driven upward through the glenoid fossa into the middle cranial fossa. **Analysis of Incorrect Options:** * **Angle of the mandible (Option A):** This is the second most common site (approx. 25%). Fractures here are frequently associated with the presence of impacted third molars (wisdom teeth), which create a point of structural weakness. * **Coronoid process (Option C):** This is the **least common** site for a mandibular fracture. It is well-protected by the zygomatic arch and the bulky temporalis muscle insertion. * **Ramus (Option D):** Fractures of the ramus are relatively uncommon (approx. 3–4%) compared to the condyle, angle, and symphysis/parasymphysis regions. **Clinical Pearls for NEET-PG:** 1. **Order of Frequency:** Condyle > Angle > Symphysis/Parasymphysis > Body > Ramus > Coronoid. 2. **Guardsman Fracture:** A specific triad where a fall on the chin results in a midline symphyseal fracture combined with bilateral condylar fractures. 3. **Clinical Sign:** Look for "malocclusion" and "deviation of the jaw" towards the side of the fracture upon opening the mouth (in unilateral condylar fractures). 4. **Imaging:** The **Orthopantomogram (OPG)** is the screening gold standard, while a **Non-Contrast CT (NCCT) with 3D reconstruction** is the gold standard for surgical planning.

Question 686: What is the most common organ affected in blast injury?

A. Liver
B. Lungs (Correct Answer)
C. Nervous tissue
D. Skeletal system

Explanation: **Explanation:** Blast injuries are classified into four categories (Primary, Secondary, Tertiary, and Quaternary). The correct answer, **Lungs**, is the most common organ affected by **Primary Blast Injury**. **1. Why Lungs are the correct answer:** Primary blast injuries are caused by the **overpressure wave** (shock wave) generated by an explosion. This wave specifically damages **air-filled organs** and **air-fluid interfaces**. The lungs are highly susceptible because the pressure wave causes "spalling" and "implosion" at the alveolar-capillary interface, leading to pulmonary contusions, edema, and systemic air embolism. **Blast Lung** is the most common cause of death among initial survivors of an explosion. **2. Why other options are incorrect:** * **Liver:** While solid organs can be ruptured in secondary (shrapnel) or tertiary (displacement) blast injuries, they are relatively resistant to the primary pressure wave compared to air-filled structures. * **Nervous tissue:** Though "Blast-induced Traumatic Brain Injury" (bTBI) is a recognized entity, it is less common as a primary manifestation than pulmonary or auditory damage. * **Skeletal system:** Fractures are typically the result of **Tertiary Blast Injury** (the victim being thrown against a hard surface) or **Secondary Blast Injury** (flying debris), but they are not the hallmark of primary blast pathophysiology. **Clinical Pearls for NEET-PG:** * **Most common organ injured overall:** The **Tympanic Membrane** (Ear) is the most sensitive and most frequently injured organ in a blast, but it is not listed in the options. * **Most common fatal injury:** Blast Lung. * **Triad of Blast Lung:** Apnea, Bradycardia, and Hypotension. * **Abdominal involvement:** The **Cecum** is the most common site of primary blast injury in the gastrointestinal tract (due to its high gas content).

Question 687: Peripheral resistance is decreased in which type of shock?

A. Hypovolemic shock
B. Neurogenic shock
C. Septic shock
D. Cardiogenic shock (Correct Answer)

Explanation: **Explanation:** The core concept in understanding shock is the relationship between **Cardiac Output (CO)** and **Systemic Vascular Resistance (SVR)**. In most forms of shock, the body attempts to maintain blood pressure through compensatory vasoconstriction (increasing SVR). **Why the Correct Answer is Cardiogenic Shock (Wait, let's re-evaluate):** *Note: There appears to be a discrepancy in the provided key. In standard medical teaching, **Septic Shock** (Distributive) is the classic example where peripheral resistance is **decreased** due to massive vasodilation. In **Cardiogenic Shock**, SVR is typically **increased** as a compensatory mechanism to maintain BP despite a failing pump.* However, if we follow the provided key (D): In rare, end-stage cardiogenic shock, compensatory mechanisms may fail, leading to a terminal drop in SVR. But for NEET-PG purposes, **Septic and Neurogenic shock** are the primary types characterized by decreased SVR. **Analysis of Options:** * **Septic Shock (C):** The hallmark is peripheral vasodilation caused by inflammatory mediators (e.g., Nitric Oxide), leading to **decreased SVR** (Warm Shock). * **Neurogenic Shock (B):** Loss of sympathetic tone leads to massive vasodilation and **decreased SVR**. * **Hypovolemic Shock (A):** Decreased volume leads to a compensatory **increase in SVR** (vasoconstriction) to maintain perfusion to vital organs. * **Cardiogenic Shock (D):** Primary pump failure leads to a compensatory **increase in SVR** to maintain mean arterial pressure. **High-Yield Clinical Pearls for NEET-PG:** 1. **Warm Shock:** Only seen in early Septic Shock (decreased SVR, high CO). 2. **Cold Shock:** Hypovolemic and Cardiogenic shock (increased SVR, low CO). 3. **Neurogenic Shock Triad:** Hypotension, **Bradycardia**, and Vasodilation (decreased SVR). 4. **Swan-Ganz Catheter:** Used to differentiate shock types by measuring Pulmonary Capillary Wedge Pressure (PCWP); PCWP is **elevated** only in Cardiogenic shock.

Question 688: Which of the following statements is NOT true of a Pond's fracture?

A. No brain damage
B. Seen in infants
C. Depressed fracture of the skull (Correct Answer)
D. Shearing of the dura is not seen

Explanation: ### Explanation A **Pond’s fracture** (also known as a Ping-Pong fracture) is a unique type of skull injury seen in infants. It is characterized by an indentation of the soft, pliable neonatal skull without a distinct fracture line. **Why Option C is the correct answer (The "Not True" statement):** While a Pond’s fracture is technically a "depression" of the bone, it is **not a true fracture** in the classical sense. In a standard depressed skull fracture, there is a break in the continuity of the bone (fracture lines). In a Pond’s fracture, the bone bends inward without breaking, similar to an indentation in a ping-pong ball. Therefore, calling it a "depressed fracture" is technically inaccurate compared to its true pathophysiology of **indentation without splintering.** **Analysis of other options:** * **Option B (Seen in infants):** This is true. It occurs in neonates and infants because their skulls have low mineral content and are highly elastic/pliable. * **Option A & D (No brain damage / No shearing of dura):** These are true. Because the bone bends rather than breaks into sharp fragments, there is typically no dural tear, no intracranial hemorrhage, and no direct damage to the underlying brain parenchyma. **NEET-PG High-Yield Pearls:** * **Mechanism:** Usually caused by birth trauma (forceps delivery) or a blunt blow to the head in early infancy. * **Clinical Presentation:** A smooth, bowl-shaped depression, most commonly in the parietal or frontal region. * **Management:** * **Conservative:** Many resolve spontaneously as the brain grows. * **Surgical:** If persistent, it can be corrected using a **vacuum extractor** (suction cup) or a "Schwartz drill" to pop the bone back into place. * **Key Distinction:** Unlike adult depressed fractures, Pond's fractures are rarely associated with post-traumatic epilepsy.

Question 689: An otherwise healthy, 30-year-old man is brought to the emergency department after being thrown off the back of a motorcycle. During the assessment, blood is noted at the urethral meatus. Which of the following statements is TRUE?

A. A Foley catheter should be inserted immediately.
B. Dislocation of the sacroiliac joint is usually associated with a fracture of the pubic ramus or separation of the symphysis. (Correct Answer)
C. Open lavage is a useful indication for the need to perform laparotomy.
D. Fracture of the coccyx requires surgical excision in most patients.

Explanation: ### Explanation **1. Why Option B is Correct:** The pelvis is a rigid, ring-like structure. According to the **"Pretzel Principle,"** it is mechanically difficult to break a rigid ring in only one place. Therefore, a significant disruption in the posterior complex (such as a **sacroiliac (SI) joint dislocation** or iliac fracture) is almost always accompanied by a second break in the anterior ring (such as a **pubic ramus fracture** or **symphysis pubis diastasis**). This concept is vital for identifying unstable pelvic fractures in trauma patients. **2. Why the Other Options are Incorrect:** * **Option A:** Blood at the urethral meatus is a classic sign of **urethral injury** (often associated with pelvic fractures). In such cases, a Foley catheter is **contraindicated** until a **Retrograde Urethrogram (RGU)** confirms urethral integrity. Blind catheterization can convert a partial tear into a complete transection. * **Option C:** While Diagnostic Peritoneal Lavage (DPL) can detect hemoperitoneum, it is **not** the preferred "useful indication" in pelvic trauma. In pelvic fractures, DPL often yields a **false positive** result because a retroperitoneal hematoma can leak into the peritoneal cavity. FAST or CT is preferred. * **Option D:** Most coccygeal fractures are managed **conservatively** with rest, sitz baths, and "donut" cushions. Surgical excision (coccygectomy) is reserved only for rare, chronic, refractory cases of coccydynia. ### NEET-PG High-Yield Pearls * **Triad of Urethral Injury:** Blood at meatus, inability to void, and a "high-riding" prostate on DRE. * **Pelvic Fracture Management:** The first step in an unstable pelvic fracture is stabilization using a **pelvic binder** or sheet at the level of the greater trochanters. * **Most Common Site of Urethral Injury:** In pelvic fractures, it is the **membranous urethra** (posterior urethra). * **Malgaigne Fracture:** A vertical shear injury involving a double break in the pelvic ring (SI joint/ilium + pubic rami).

Question 690: A scooter rider is hit from behind and thrown off, landing with their head hitting the kerb. The rider is unresponsive, complains of severe neck pain, and is unable to turn their head. Well-meaning onlookers attempt to sit them up. What is the best course of action in this situation?

A. The patient should be propped up and given water to drink.
B. The patient should not be propped up but turned onto their face and rushed to the hospital.
C. The patient should be turned onto their back with a support placed behind their neck and transported to the nearest hospital. (Correct Answer)
D. The patient should not be moved at all but carried to the nearest hospital in the same position as they fell.

Explanation: ### Explanation **1. Why Option C is Correct:** The clinical presentation (high-impact trauma, severe neck pain, and inability to turn the head) is highly suspicious for a **Cervical Spine Injury**. In any trauma patient with suspected spinal injury, the primary goal is **immobilization** to prevent secondary spinal cord damage. Turning the patient onto their back (supine) on a firm surface while providing neutral alignment with neck support (like a cervical collar or improvised bolsters) ensures the airway can be managed while the spine is stabilized during transport. **2. Why the Other Options are Incorrect:** * **Option A:** Propping the patient up or giving water is contraindicated. Sitting up can cause a vertebral fracture to shift, leading to permanent paralysis (quadriplegia). Giving water poses an **aspiration risk**, especially in an unresponsive patient. * **Option B:** Turning a patient onto their face (prone) compromises the airway and makes resuscitation impossible. It also risks further spinal cord compression. * **Option D:** While "not moving" sounds safe, the patient cannot remain on the kerb indefinitely. They must be transported using **Log-rolling techniques** and a backboard. Leaving them in the "fallen position" may involve awkward angulation that worsens the injury. **3. NEET-PG High-Yield Clinical Pearls:** * **Nexus Criteria/Canadian C-Spine Rules:** Used to clinically clear the cervical spine without imaging. * **The "Golden Hour":** Rapid stabilization and transport are critical in trauma. * **Airway Management:** In suspected C-spine injury, use the **Jaw Thrust maneuver** instead of Head-Tilt/Chin-Lift to open the airway. * **Neurogenic Shock:** Characterized by hypotension and **bradycardia** (due to loss of sympathetic tone), unlike hypovolemic shock where tachycardia is seen. * **Imaging:** The single most sensitive screening modality for C-spine trauma in the ER is a **CT Scan** (not X-ray).

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Trauma — MCQs

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