Trauma — MCQs

Following a car crash in which her face hit the steering wheel, a 37-year-old woman presents to the emergency department with facial deformity. Facial x-rays showed a transverse fracture through the articulation of the maxillary and nasal bones with the frontal bone. The fracture also passed below the zygomatic bone. What is the diagnosis?

Q586Easy

The management of fat embolism includes all of the following except?

Q587Easy

Diagnostic peritoneal lavage is confirmed positive by which of the following parameters?

Q588Medium

Which of the following statements is NOT true regarding subdural hematoma?

Q589Easy

True about frostbite are all, except:

Q590Easy

What is the rigidity characteristic of Champy's mini plates?

Trauma Indian Medical PG Practice Questions and MCQs

Question 581: Gillies approach for reduction of zygomatic fractures is done through which anatomical space?

A. Temporal fossa (Correct Answer)
B. Infratemporal fossa
C. Infraorbital fossa
D. All of the above

Explanation: **Explanation:** The **Gillies approach** (or Gillies temporal approach) is a classic surgical technique used for the indirect reduction of isolated fractures of the zygomatic arch or zygomaticomalar complex. **Why Temporal Fossa is Correct:** The procedure involves making an incision within the hairline, approximately 2.5 cm superior and anterior to the helix of the ear. The dissection is carried down through the skin and subcutaneous tissue until the **deep temporal fascia** is identified. An incision is made through this fascia to reveal the **temporalis muscle**. A Rowe’s zygomatic elevator or a Bristow’s elevator is then passed deep to the temporal fascia but superficial to the temporalis muscle. This specific plane leads directly into the **temporal fossa**, allowing the instrument to slide inferiorly behind the zygomatic arch to exert upward and outward pressure for reduction. **Why Other Options are Incorrect:** * **Infratemporal Fossa:** This space lies deep and inferior to the zygomatic arch. Entering this space would involve unnecessary risk to the maxillary artery and pterygoid venous plexus, and it is not the surgical plane used in the Gillies technique. * **Infraorbital Fossa:** This is located on the anterior surface of the maxilla. While zygomatic fractures may involve the infraorbital rim, the Gillies approach specifically utilizes the temporal route to leverage the arch from behind. **Clinical Pearls for NEET-PG:** * **Key Landmark:** The elevator must be placed **deep to the deep temporal fascia** to ensure it slides behind the zygomatic arch. * **Alternative Approach:** The **Keen’s approach** is an intraoral method (buccal sulcus incision) used for the same purpose. * **Dingman’s Approach:** A lateral brow incision used for zygomaticofrontal suture reduction. * **High-Yield Fact:** The Gillies approach is preferred because it leaves no visible facial scar and utilizes the strong temporal fascia as a guide.

Question 582: A 45-year-old woman presents with intracranial extradural hemorrhage. Which of the following is least likely?

A. Absence of a lucid interval (Correct Answer)
B. It is not commonly seen in old age
C. Middle meningeal artery involvement
D. Temporoparietal region fracture

Explanation: **Explanation:** **Extradural Hemorrhage (EDH)**, also known as epidural hemorrhage, typically occurs due to arterial bleeding between the skull and the dura mater. **Why Option A is the Correct Answer (Least Likely):** The **"Lucid Interval"**—a period of temporary improvement in consciousness followed by rapid deterioration—is a **classic hallmark** of EDH, occurring in approximately 20–50% of cases. While not present in every patient, stating that its "absence" is a characteristic feature is incorrect. In clinical practice, the presence of a lucid interval strongly suggests EDH over other intracranial bleeds. **Analysis of Incorrect Options:** * **Option B (Not common in old age):** This is a **true** statement. EDH is less common in the elderly because the dura mater becomes more tightly adherent to the inner table of the skull with age, making it difficult for a hematoma to strip the dura away. It is most common in young adults. * **Option C (Middle meningeal artery):** This is **true**. The most common source of bleeding in EDH (85% of cases) is the **Middle Meningeal Artery (MMA)**, specifically its anterior branch. * **Option D (Temporoparietal fracture):** This is **true**. The MMA runs beneath the **pterion**, where the skull is thinnest. A fracture in the temporoparietal region is the most frequent cause of MMA laceration. **High-Yield Clinical Pearls for NEET-PG:** * **CT Appearance:** EDH presents as a **Biconvex (Lentiform)**, hyperdense, extra-axial collection that **does not cross suture lines** (as the dura is fixed at sutures). * **Source of Bleed:** MMA (Arterial) is most common; however, dural venous sinus injury can cause EDH in the posterior fossa. * **Management:** Urgent surgical evacuation (burr hole or craniotomy) is required if the hematoma is symptomatic or >15mm in thickness.

Question 583: Which of the following conditions is associated with a "moon face" appearance?

A. Isolated LeFort I fracture
B. LeFort II and Le Fort III fractures (Correct Answer)
C. Mandibular fractures
D. Unilateral zygomatic complex fractures

Explanation: **Explanation:** The "moon face" appearance is a classic clinical sign in midface trauma, specifically associated with **Le Fort II (Pyramidal)** and **Le Fort III (Craniofacial dysjunction)** fractures. **1. Why Le Fort II and III are correct:** In these high-energy injuries, the entire midface complex becomes detached from the cranial base and displaced downward and backward due to the pull of the pterygoid muscles. This results in: * **Lengthening of the face:** The downward displacement increases the vertical dimension. * **Facial Flattening:** The backward displacement creates a "dish-face" deformity. * **Edema:** Significant soft tissue swelling and hematoma (often accompanied by bilateral periorbital ecchymosis or "raccoon eyes") round out the facial contours, resulting in the characteristic **"moon face."** **2. Why other options are incorrect:** * **Isolated Le Fort I:** This is a low-level horizontal fracture of the maxilla (Guérin's fracture). While it causes a "floating palate," it does not involve the orbit or the zygomatic complex, thus lacking the extensive edema and structural displacement required for a moon face. * **Mandibular fractures:** These affect the lower third of the face. They typically present with malocclusion, trismus, or step-deformities, but do not cause midface lengthening. * **Unilateral zygomatic complex fractures:** These are localized injuries. They usually cause a "flattened cheekbone" or facial asymmetry rather than a symmetrical, rounded moon face. **High-Yield Clinical Pearls for NEET-PG:** * **Le Fort I:** Floating palate. * **Le Fort II:** Pyramidal shape; involves the infraorbital rim. * **Le Fort III:** Craniofacial dysjunction; involves the zygomatic arch. * **CSF Rhinorrhea:** Most common in Le Fort II and III due to involvement of the ethmoid bone/cribriform plate. * **Guerin’s Sign:** Ecchymosis in the region of the greater palatine vessels (seen in Le Fort fractures).

Question 584: Intrapleural pressure greater than atmospheric pressure is diagnostic of which condition?

A. Valvular pneumothorax (Correct Answer)
B. Closed pneumothorax
C. Open pneumothorax
D. All of the above

Explanation: **Explanation:** The core concept behind this question is the relationship between intrapleural pressure and atmospheric pressure in various types of pneumothorax. **1. Why Valvular Pneumothorax is Correct:** Valvular pneumothorax, also known as **Tension Pneumothorax**, occurs when a "one-way valve" mechanism is created (either by a chest wall wound or a lung parenchymal injury). Air enters the pleural space during inspiration but cannot escape during expiration. This leads to a progressive accumulation of air, causing the intrapleural pressure to rise and eventually **exceed atmospheric pressure**. This positive pressure causes the collapse of the ipsilateral lung and a mediastinal shift to the opposite side, leading to hemodynamic instability. **2. Why Other Options are Incorrect:** * **Closed Pneumothorax:** Air enters the pleural space (usually from a lung leak) but the leak seals off. The intrapleural pressure remains **negative** (less than atmospheric), though it is higher than normal. * **Open Pneumothorax (Sucking Chest Wound):** There is a direct communication between the atmosphere and the pleural space. The intrapleural pressure **equilibrates** with atmospheric pressure but does not exceed it. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Tension pneumothorax is a **clinical diagnosis**. Do not wait for a Chest X-ray if the patient is symptomatic (tracheal shift, respiratory distress, hypotension). * **Management:** Immediate **needle decompression** (5th intercostal space, mid-axillary line in adults) followed by Tube Thoracostomy (ICD). * **Radiological Sign:** Deviation of the mediastinum and flattening/inversion of the diaphragm on the affected side.

Question 585: Following a car crash in which her face hit the steering wheel, a 37-year-old woman presents to the emergency department with facial deformity. Facial x-rays showed a transverse fracture through the articulation of the maxillary and nasal bones with the frontal bone. The fracture also passed below the zygomatic bone. What is the diagnosis?

A. Sphenoid wing fracture
B. LeFort II fracture (Correct Answer)
C. Petrous temporal fracture
D. Palatal split

Explanation: **Explanation:** The diagnosis is a **LeFort II fracture**, also known as a **pyramidal fracture**. This classification is based on the René Le Fort system, which describes common patterns of midface fractures. **Why LeFort II is correct:** The description provided—a transverse fracture through the **nasofrontal suture** (articulation of maxillary/nasal bones with the frontal bone) that passes **below the zygomatic bone** (specifically through the infraorbital margin and maxillary sinus)—is the classic anatomical path of a LeFort II fracture. This results in a pyramid-shaped mobile segment of the midface. **Analysis of Incorrect Options:** * **A. Sphenoid wing fracture:** These are typically associated with high-energy lateral skull trauma and involve the orbit or cranial base, not the central midface/maxilla. * **C. Petrous temporal fracture:** These involve the base of the skull and present with symptoms like hemotympanum, Battle’s sign, or CSF otorrhea, rather than facial deformity. * **D. Palatal split:** This is a sagittal fracture of the hard palate, often associated with LeFort I or II, but it does not involve the nasofrontal suture. **High-Yield Clinical Pearls for NEET-PG:** * **LeFort I (Guerin’s):** Horizontal fracture above the teeth; separates the alveolar process from the maxilla ("Floating Palate"). * **LeFort II (Pyramidal):** Involves the bridge of the nose and infraorbital margin; the zygomatic bones remain attached to the skull. * **LeFort III (Craniofacial Dysjunction):** The fracture line passes through the zygomatic arches and frontozygomatic suture; the entire midface is separated from the cranium ("Floating Face"). * **Clinical Sign:** To differentiate these, stabilize the forehead and move the hard palate. In LeFort II, the nose moves with the teeth; in LeFort III, the entire face moves.

Question 586: The management of fat embolism includes all of the following except?

A. Oxygen
B. Heparinization
C. Low Molecular Weight Dextran
D. Pulmonary Embolectomy (Correct Answer)

Explanation: **Explanation:** Fat Embolism Syndrome (FES) is a clinical diagnosis typically following long bone fractures (e.g., femur). The pathophysiology involves mechanical obstruction of small vessels by fat globules and a secondary chemical pneumonitis caused by free fatty acids. **Why Pulmonary Embolectomy is the Correct Answer (The "Except"):** Pulmonary embolectomy is the definitive surgical treatment for **Massive Thromboembolism** (blood clots), where a large embolus obstructs the main pulmonary arteries. In Fat Embolism, the fat globules are microscopic and lodge in the distal pulmonary **capillaries and microvasculature**, making surgical removal physically impossible. Therefore, management is primarily supportive, not surgical. **Analysis of Incorrect Options:** * **Oxygen:** This is the **most important** initial step. Hypoxemia is a hallmark of FES; maintaining adequate oxygenation (sometimes requiring mechanical ventilation with PEEP) prevents secondary organ damage. * **Heparinization:** Historically used to clear lipemia by stimulating lipoprotein lipase. While its routine use is now controversial due to bleeding risks in trauma patients, it remains a documented pharmacological option in textbooks. * **Low Molecular Weight Dextran:** Used to improve microcirculation by reducing blood viscosity and preventing red cell aggregation around fat globules. **NEET-PG High-Yield Pearls:** * **Gurd’s Criteria:** Used for diagnosis. Major signs include Axillary/Subconjunctival **petechiae** (pathognomonic), respiratory insufficiency, and CNS depression. * **Classic Triad:** Dyspnea, Confusion, and Petechiae (occurs in only 20-50% of cases). * **Snowstorm Appearance:** Characteristic finding on Chest X-ray (diffuse bilateral pulmonary infiltrates). * **Prevention:** Early internal fixation/stabilization of fractures is the best way to prevent FES.

Question 587: Diagnostic peritoneal lavage is confirmed positive by which of the following parameters?

A. More than 1 lakh red blood cells/ml
B. More than 500 white blood cells/ml
C. Increased amylase
D. All the above (Correct Answer)

Explanation: **Explanation:** Diagnostic Peritoneal Lavage (DPL) is a rapid bedside procedure used to detect intra-abdominal hemorrhage or hollow viscus injury following blunt trauma. While largely replaced by FAST and CT scans, it remains high-yield for exams due to its specific diagnostic criteria. **Why "All the Above" is Correct:** A DPL is considered **positive** if any of the following quantitative criteria are met after instilling 1 liter of warm normal saline (10ml/kg in children) into the peritoneal cavity: 1. **Red Blood Cells (RBCs):** >100,000 cells/mm³ (or 1 lakh/ml). This is the most common indicator of significant intraperitoneal bleeding. 2. **White Blood Cells (WBCs):** >500 cells/mm³. An elevated WBC count suggests an inflammatory response, often seen in delayed presentations or hollow viscus perforation. 3. **Amylase/Lipase:** Levels >20 IU/L (or greater than serum levels) indicate potential pancreatic injury or small bowel perforation. 4. **Other Criteria:** Presence of bile, bacteria (on Gram stain), or food particles in the effluent. **Analysis of Options:** * **Option A:** Correct. 1 lakh RBCs/ml is the standard threshold for blunt trauma. (Note: For penetrating trauma, the threshold is lower, often 5,000–10,000 RBCs/ml). * **Option B:** Correct. >500 WBCs/ml is a classic marker for bowel injury. * **Option C:** Correct. Elevated amylase in the lavage fluid is a specific marker for pancreatic or upper GI injury. **Clinical Pearls for NEET-PG:** * **Absolute Contraindication:** Need for immediate laparotomy (hemodynamic instability with obvious source). * **Relative Contraindications:** Prior abdominal surgeries, morbid obesity, advanced cirrhosis, and coagulopathy. * **Technical Note:** Always perform a **gastric tube** and **urinary catheterization** before the procedure to decompress the stomach and bladder to prevent accidental injury. * **Initial Aspirate:** If >10 ml of frank blood is aspirated immediately upon inserting the catheter (before instilling saline), it is a "Grossly Positive" DPL, and the procedure stops—the patient goes to the OR.

Question 588: Which of the following statements is NOT true regarding subdural hematoma?

A. It occurs bilaterally. (Correct Answer)
B. It is not visible on X-ray.
C. Surgical intervention is possible.
D. Surgery is typically unilateral.

Explanation: ### Explanation **Subdural Hematoma (SDH)** is a collection of blood between the dura mater and the arachnoid mater, usually resulting from the tearing of **bridging veins**. **1. Why Option A is the Correct Answer (The "Not True" Statement):** While chronic subdural hematomas can occasionally be bilateral (especially in elderly patients or those with brain atrophy), **acute subdural hematomas are typically unilateral**. In the context of trauma and standard surgical presentations, SDH is characterized as a focal collection on one side of the brain. Therefore, stating that it "occurs bilaterally" as a general rule or defining characteristic is incorrect. **2. Analysis of Other Options:** * **Option B (Not visible on X-ray):** This is **true**. X-rays only visualize bony structures. To diagnose SDH, a **Non-Contrast CT (NCCT) Head** is the gold standard, showing a characteristic **crescent-shaped (concave)** hyperdensity. * **Option C (Surgical intervention is possible):** This is **true**. Surgery (Craniotomy or Burr hole evacuation) is indicated if there is significant midline shift (>5mm), clot thickness >10mm, or declining GCS. * **Option D (Surgery is typically unilateral):** This is **true**. Since the hematoma is usually located on one side, the surgical decompression is performed only on the affected side. **Clinical Pearls for NEET-PG:** * **Shape:** SDH is **Crescentic/Concave**, whereas Epidural Hematoma (EDH) is Biconvex/Lenticular. * **Source of Bleed:** Bridging veins (SDH) vs. Middle Meningeal Artery (EDH). * **Suture Lines:** SDH **can cross suture lines** (unlike EDH) but is limited by dural reflections like the falx cerebri. * **Chronic SDH:** Often presents in elderly patients or alcoholics after minor trauma; NCCT shows a **hypodense** (dark) collection.

Question 589: True about frostbite are all, except:

A. Occurs due to extreme cold
B. Formation of ice crystals within tissues
C. Rewarming is not done (Correct Answer)
D. Seen in fingers and toes

Explanation: **Explanation:** Frostbite is a localized cold injury caused by exposure to freezing temperatures (usually below 0°C). The pathophysiology involves the **formation of ice crystals within the extracellular space** (Option B), which leads to cell dehydration, protein denaturation, and direct mechanical damage to cell membranes. It most commonly affects the **distal extremities** like fingers, toes, ears, and the nose (Option D) due to peripheral vasoconstriction and a high surface-area-to-volume ratio. **Why Option C is the correct (False) statement:** The cornerstone of frostbite management is **rapid rewarming**. The standard protocol involves immersing the affected part in a controlled water bath at **37°C to 42°C** (ideally 40-42°C) for 20–30 minutes. Rewarming should only be delayed if there is a risk of **refreezing**, as the "freeze-thaw-refreeze" cycle causes significantly more tissue necrosis than a single prolonged freeze. **Analysis of other options:** * **Option A:** Correct. Frostbite is strictly an injury caused by extreme cold/freezing. * **Option B:** Correct. Ice crystal formation is the hallmark of frostbite (unlike frostnip or chilblains). * **Option D:** Correct. These are the most vulnerable anatomical sites. **High-Yield Clinical Pearls for NEET-PG:** 1. **Management Rule:** "Frozen in January, amputate in July." Early surgical debridement is contraindicated; wait for a clear line of demarcation (usually 1–3 months). 2. **Avoid Friction:** Never rub or massage the frostbitten area, as this causes further mechanical trauma to the fragile tissues. 3. **Classification:** Similar to burns, frostbite is classified into four degrees (1st: erythema; 2nd: clear blisters; 3rd: hemorrhagic blisters; 4th: involvement of bone/tendon). 4. **Adjuvant Therapy:** Tetanus prophylaxis and Ibuprofen (to inhibit the arachidonic acid cascade) are recommended.

Question 590: What is the rigidity characteristic of Champy's mini plates?

A. Non-rigid
B. Semi-rigid (Correct Answer)
C. Rigid
D. None of the above

Explanation: **Explanation:** The concept of **Champy’s technique** is based on the principle of **monocortical osteosynthesis** using mini-plates. It is the gold standard for managing non-comminuted mandibular fractures (especially at the angle and symphysis). **1. Why Semi-rigid is correct:** Champy’s mini-plates are classified as **semi-rigid** because they provide enough stability to allow primary bone healing while still permitting microscopic movement at the fracture site. Unlike rigid fixation, these plates are applied along the **"Ideal Osteosynthesis Lines"** (lines of tension). They counteract the distracting tensile forces at the superior border of the mandible while allowing the patient’s own masticatory muscles to provide compressive forces at the inferior border. This "functional" stability defines semi-rigid fixation. **2. Why other options are incorrect:** * **Non-rigid:** This refers to methods like Intermaxillary Fixation (IMF) or wiring, which do not provide internal structural stability to the bone fragments. * **Rigid:** Rigid fixation (e.g., large reconstruction plates or compression plates with bicortical screws) completely immobilizes the fracture site, preventing any interfragmentary motion. While stable, it requires larger incisions and carries a higher risk of stress shielding compared to Champy’s mini-plates. **Clinical Pearls for NEET-PG:** * **Material:** Usually made of **Titanium** (biocompatible and non-magnetic). * **Placement:** Placed at the **superior border** (tension zone) of the mandible to avoid the inferior alveolar nerve. * **Screws:** Uses **monocortical screws** (only engage the outer cortex). * **Advantage:** Allows immediate post-operative jaw function and avoids the discomfort of prolonged IMF.

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