Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 691: Undue restlessness in a patient during the immediate post-burn period is often a manifestation of?

A. Hypoxia
B. Hypovolemia
C. Hyperkalemia
D. Anxiety (Correct Answer)

Explanation: **Explanation:** In the immediate post-burn period, **Anxiety** is the most common cause of undue restlessness. Severe thermal injury is a traumatic event characterized by intense pain, fear, and a sudden loss of control, leading to significant psychological distress. While physiological factors must be ruled out, restlessness that is "undue" or disproportionate to the clinical state is typically psychogenic. **Analysis of Options:** * **Anxiety (Correct):** The psychological impact of the burn, combined with severe pain, triggers an acute stress response. In clinical practice, if a patient is hemodynamically stable and well-oxygenated but remains restless, anxiety and pain are the primary culprits. * **Hypoxia:** While hypoxia causes restlessness and agitation (air hunger), it is usually associated with inhalation injuries, circumferential chest burns, or carbon monoxide poisoning. It is a critical "must-exclude" cause but is less common than anxiety in a general burn population. * **Hypovolemia:** Hypovolemic shock (burn shock) leads to decreased cerebral perfusion, which can cause restlessness and altered sensorium. However, this is typically accompanied by objective signs like tachycardia, hypotension, and decreased urine output. * **Hyperkalemia:** Early hyperkalemia occurs due to massive cell lysis (especially in electrical or deep burns). It primarily manifests as cardiac arrhythmias or muscle weakness rather than isolated restlessness. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** In any trauma or burn patient, always rule out **Hypoxia** and **Hypovolemia** first before attributing restlessness to anxiety. * **Pain Management:** Restlessness in burns is often an indicator of inadequate analgesia. IV Opioids (in small, titrated doses) are the gold standard. * **Fluid Resuscitation:** The Parkland Formula ($4ml \times kg \times \%TBSA$) remains the high-yield calculation for managing the hypovolemic phase of burns.

Question 692: What is not part of the curative therapy for medulloblastoma in a 1.5-year-old child?

A. Open surgery with leaving tumor margins (Correct Answer)
B. Chemotherapy
C. Total craniospinal irradiation
D. Ventricular-peritoneal shunt for obstructive hydrocephalus

Explanation: **Explanation:** Medulloblastoma is a highly malignant WHO Grade 4 embryonal tumor of the posterior fossa. The primary goal of surgery is **maximal safe resection**. **Why Option A is the correct answer:** In oncological surgery for medulloblastoma, the objective is "Gross Total Resection" (GTR). Leaving tumor margins intentionally is incorrect because the volume of residual tumor is a critical prognostic factor. A residual tumor area $>1.5 \text{ cm}^2$ classifies the patient as "High Risk," significantly worsening the prognosis. Therefore, leaving margins is not part of curative therapy. **Analysis of other options:** * **B. Chemotherapy:** This is a cornerstone of treatment, especially in children under 3 years of age, to delay or avoid the neurocognitive side effects of radiation. * **C. Total Craniospinal Irradiation (CSI):** Medulloblastoma has a high propensity for CSF seeding (drop metastases). CSI is standard for "sealing" the neuraxis, though it is often deferred in children $<3$ years old to prevent developmental delay. * **D. VP Shunt:** Approximately 80% of patients present with obstructive hydrocephalus. While many are managed with perioperative steroids or EVD, a permanent VP shunt is often required for symptomatic relief and stabilization. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Arises from the **external granular layer** of the cerebellum; typically found in the **vermis** (midline) in children. * **Histology:** Characterized by **Homer-Wright Rosettes** and small round blue cells. * **Genetics:** Four molecular subgroups exist: **WNT** (best prognosis), **SHH**, Group 3 (worst prognosis), and Group 4. * **Classic Sign:** "Drop metastasis" to the cauda equina.

Question 693: Which of the following is a characteristic feature of neurogenic shock?

A. Increased peripheral resistance and decreased cardiac output
B. Increased venous return and decreased cardiac output
C. Decreased peripheral resistance and decreased cardiac output (Correct Answer)
D. Increased venoconstriction and decreased cardiac output

Explanation: **Explanation:** Neurogenic shock occurs due to the loss of sympathetic vasomotor tone, typically following a high spinal cord injury (above T6). This leads to a classic "hemodynamic collapse" characterized by the following: 1. **Decreased Peripheral Resistance:** The loss of sympathetic outflow results in massive **vasodilation** of the arterioles. This significantly reduces Systemic Vascular Resistance (SVR). 2. **Decreased Cardiac Output:** Loss of sympathetic tone to the heart (T1-T4 segments) leads to **bradycardia** (loss of compensatory tachycardia) and decreased myocardial contractility. Additionally, venous dilation causes **pooling of blood** in the extremities, reducing venous return (preload), which further lowers cardiac output. **Analysis of Incorrect Options:** * **Option A & D:** These suggest increased resistance or venoconstriction. In neurogenic shock, the "sympathetic switch" is turned off; therefore, vasoconstriction is impossible. Increased resistance is seen in hypovolemic or cardiogenic shock as a compensatory mechanism. * **Option B:** Venous return is actually **decreased** due to peripheral venous pooling (vasodilation), not increased. **NEET-PG High-Yield Pearls:** * **The Classic Triad:** Hypotension + Bradycardia + Warm/Dry extremities (due to vasodilation). This distinguishes it from hypovolemic shock (where extremities are cold/clammy and tachycardia is present). * **Level of Injury:** Usually occurs in spinal cord injuries at or above the **T6 level**. * **Management:** Initial resuscitation with IV fluids; however, **Vasopressors** (e.g., Norepinephrine/Phenylephrine) and **Atropine** (for bradycardia) are often required to restore vascular tone. * **Spinal vs. Neurogenic Shock:** Remember that *Spinal Shock* refers to the loss of reflexes (neurological), while *Neurogenic Shock* refers to hemodynamic instability (circulatory).

Question 694: What is the ideal treatment for a fracture of the angle of the mandible?

A. Transosseous wiring
B. Intermaxillary fixation
C. Plating on the lateral side of the body of the mandible
D. Plating at the inferior border of the mandible (Correct Answer)

Explanation: **Explanation:** The management of mandibular angle fractures is governed by the biomechanical principles of the mandible, specifically **Champy’s Principle**. When the mandible functions, the superior border acts as a tension zone, while the inferior border acts as a compression zone. **Why Option D is Correct:** For fractures at the angle of the mandible, stable internal fixation is required to counteract the distracting forces of the masticatory muscles (masseter, medial pterygoid, and temporal). **Plating at the inferior border** (or along the external oblique ridge) provides rigid fixation by neutralizing these compressive forces. In modern maxillofacial surgery, a single non-compression miniplate placed according to Champy’s lines of osteosynthesis is the standard of care to ensure primary bone healing. **Analysis of Incorrect Options:** * **A. Transosseous wiring:** This is an obsolete technique. It provides poor stability, does not allow for primary bone healing, and usually requires prolonged immobilization. * **B. Intermaxillary fixation (IMF):** While IMF is used to establish occlusion, it is rarely used as a definitive monotherapy for angle fractures because it requires 4–6 weeks of jaw wiring, leading to TMJ stiffness and poor nutrition. * **C. Plating on the lateral side:** Placing a plate on the lateral surface of the body is biomechanically less stable for angle fractures compared to the inferior border or the superior tension zone (external oblique ridge). **High-Yield Clinical Pearls for NEET-PG:** * **Champy’s Line:** The ideal line for plating in the angle of the mandible is the **external oblique ridge**. * **Nerve Injury:** The most common nerve at risk during mandibular fracture repair is the **Inferior Alveolar Nerve**. * **Muscle Action:** Angle fractures are often classified as **"favorable" or "unfavorable"** based on whether the masseter muscle pulls the fragments together or apart. * **Access:** Most angle fractures are now treated via an **intra-oral approach** to avoid scarring and injury to the marginal mandibular nerve.

Question 695: Which forceps are used for maxillary fracture disimpaction?

A. Rowe's (Correct Answer)
B. Bristow's
C. Ash's
D. Walsham's

Explanation: **Explanation:** The correct answer is **Rowe’s disimpaction forceps**. Maxillary fractures, particularly Le Fort I, II, and III types, often result in the maxilla being pushed posteriorly and superiorly, becoming "impacted" against the cranial base. To achieve proper anatomical reduction, the maxilla must be forcibly mobilized. Rowe’s forceps are designed in pairs (left and right). One blade is flat and passed into the nostril to rest on the nasal floor, while the other blade is curved to fit over the alveolar ridge and hard palate. This allows the surgeon to grasp the maxilla firmly and apply forward and downward traction to disimpact it. **Analysis of Incorrect Options:** * **Bristow’s Elevator:** This is a sturdy elevator used primarily for the reduction of **Zygomatic bone (Zygomaticomaxillary complex)** fractures. It is inserted through a temporal (Gillies) approach to lever the malar bone back into position. * **Ash’s Forceps:** These are used specifically for the reduction of **Nasal Septal fractures**. The blades are straight and designed to compress and straighten the septum. * **Walsham’s Forceps:** These are used to reduce and manipulate **Nasal Bone fractures**. One blade is thin to enter the nasal cavity, while the other is covered with a rubber sleeve to protect the external skin of the nose. **High-Yield Clinical Pearls for NEET-PG:** * **Rowe’s Forceps = Maxilla** (Disimpaction). * **Walsham’s/Ash’s Forceps = Nose** (Nasal bone/Septum). * **Gillies Temporal Approach:** The classic surgical approach to reduce a fractured zygoma using a Bristow’s elevator. * **Guérin’s Sign:** Ecchymosis in the region of the greater palatine vessels, characteristic of Le Fort I fractures.

Question 696: Which is the immediate danger to a patient with severe facial injuries?

A. Bleeding
B. Associated fracture of the spine
C. Infection
D. Respiratory obstruction (Correct Answer)

Explanation: **Explanation:** In the management of a trauma patient, the **ABCDE protocol** (Airway, Breathing, Circulation, Disability, Exposure) dictates the priority of care. For severe facial injuries, **Respiratory Obstruction (Airway)** is the most immediate and life-threatening danger. **Why Respiratory Obstruction is the Correct Answer:** Facial trauma often leads to airway compromise through several mechanisms: * **Mechanical obstruction:** Posterior displacement of a fractured maxilla or a "flail mandible" (symphysis fracture) causing the tongue to fall back. * **Aspiration:** Blood, secretions, broken teeth, or bone fragments can block the glottis. * **Soft tissue swelling:** Rapidly developing edema or hematoma in the floor of the mouth or neck can compress the airway. **Analysis of Incorrect Options:** * **A. Bleeding:** While maxillofacial injuries can cause significant hemorrhage (e.g., from the internal maxillary or ethmoidal arteries), "Airway" always precedes "Circulation" in trauma priority. * **B. Associated fracture of the spine:** Cervical spine injuries are common in facial trauma and require stabilization, but they do not cause immediate death as rapidly as a blocked airway. * **C. Infection:** This is a late complication (occurring days later) and is never an "immediate" danger in the acute trauma setting. **Clinical Pearls for NEET-PG:** * **The "Golden Hour":** Airway management is the first step in the primary survey. * **Mandibular Fractures:** Bilateral parasymphyseal fractures are particularly dangerous as they result in loss of tongue support, leading to immediate airway occlusion. * **Management:** The first maneuver to open the airway in trauma is the **Jaw Thrust** (avoiding head tilt/chin lift to protect the C-spine). If unsuccessful, definitive airway (intubation or cricothyroidotomy) is required.

Question 697: What is the most important clinical finding in a case of head injury?

A. Pupillary dilatation
B. Level of consciousness (Correct Answer)
C. Focal neurological deficit
D. Skull fracture

Explanation: **Explanation:** In the management of head injury, the **level of consciousness** is the most sensitive and reliable clinical indicator of the patient's neurological status. It reflects the global functional integrity of the brain, specifically the Reticular Activating System (RAS) and the cerebral cortex. A declining level of consciousness is often the earliest sign of secondary brain injury, such as rising intracranial pressure (ICP) or an expanding hematoma, and is the primary parameter used in the **Glasgow Coma Scale (GCS)** to guide surgical intervention and prognosis. **Analysis of Options:** * **Pupillary dilatation (Option A):** While a critical sign of uncal herniation or third nerve compression, it is often a late finding. By the time a pupil dilates, significant brainstem compromise may have already occurred. * **Focal neurological deficit (Option B):** This helps in localizing a lesion (e.g., hemiparesis in an EDH), but it is not as vital as the overall conscious state for determining immediate life-saving management. * **Skull fracture (Option D):** This is a radiological or physical finding indicating the force of impact. However, a patient can have a fatal brain injury without a fracture, or a significant fracture without brain injury; thus, it is not the most important clinical finding. **Clinical Pearls for NEET-PG:** * **GCS Scoring:** The most important component of GCS is the **Motor response**, as it is the most predictive of outcome. * **Lucid Interval:** Classically associated with **Epidural Hematoma (EDH)**, usually due to a tear in the Middle Meningeal Artery. * **Cushing’s Triad:** A late sign of increased ICP consisting of hypertension, bradycardia, and irregular respiration. * **Golden Hour:** The first hour after injury where rapid assessment of consciousness can prevent irreversible primary and secondary damage.

Question 698: After falling on the pavement, a 72-year-old woman is found to have a fracture of the radius and ulna (Colles' fracture). What is true of this fracture?

A. The fall occurs on the dorsum of the wrist.
B. Open reduction is most commonly indicated.
C. Younger men are generally affected.
D. The distal radial metaphysis is displaced dorsally. (Correct Answer)

Explanation: **Explanation:** **Colles’ fracture** is a common extra-articular fracture of the distal radius, typically occurring about 2 cm proximal to the radiocarpal joint. 1. **Why Option D is correct:** The hallmark of a Colles’ fracture is the **dorsal (posterior) displacement** and dorsal angulation of the distal radial fragment. This occurs because the force of the fall is transmitted through the carpus to the dorsal aspect of the radius, resulting in the classic **"Dinner Fork Deformity."** 2. **Why other options are incorrect:** * **Option A:** The mechanism of injury is a fall on an **outstretched hand (FOOSH)** with the wrist in **extension**, not on the dorsum. A fall on a flexed wrist (dorsum) leads to a **Smith’s fracture** (Reverse Colles’). * **Option B:** Most Colles’ fractures are managed via **closed reduction** and immobilization in a Colles’ cast (below-elbow cast with slight wrist flexion and ulnar deviation). Open reduction is reserved for unstable or intra-articular fractures. * **Option C:** This fracture typically affects **elderly post-menopausal women** due to underlying osteoporosis. In younger individuals, high-energy trauma is required to cause a similar injury. **NEET-PG High-Yield Pearls:** * **Deformities in Colles’:** Dorsal displacement, dorsal tilt, lateral displacement, lateral tilt, and impaction (shortening). * **Smith’s Fracture:** Distal fragment is displaced **ventrally/palmarly** (Garden Spade deformity). * **Barton’s Fracture:** Intra-articular fracture-dislocation of the radiocarpal joint. * **Complications:** The most common late complication is **malunion**; the most common nerve involved is the **Median nerve** (Carpal Tunnel Syndrome); a specific late complication is rupture of the **Extensor Pollicis Longus (EPL)** tendon.

Question 699: During an emergency thoracotomy, an incision is made greater than 1 cm lateral to the sternal margin. This incision will preserve which of the following structures?

A. Intercostal artery
B. Superficial epigastric artery
C. Internal mammary artery (Correct Answer)
D. Intercostal vein

Explanation: **Explanation:** The **Internal Mammary Artery (IMA)**, also known as the Internal Thoracic Artery, is a branch of the first part of the subclavian artery. It descends vertically behind the costal cartilages, approximately **1 cm lateral to the sternal margin** on each side. During an emergency thoracotomy or the placement of a chest tube, incisions must be made carefully to avoid vascular injury. By making an incision **greater than 1 cm lateral** to the sternum, the surgeon ensures they stay lateral to the course of the IMA, thereby preserving it. **Analysis of Options:** * **Internal Mammary Artery (Correct):** Its anatomical location (1 cm lateral to the sternum) makes it the primary structure at risk during parasternal incisions. * **Intercostal Artery & Vein (Incorrect):** These vessels run along the **inferior margin** of each rib within the costal groove. They are avoided by making incisions or inserting needles at the **superior border** of the rib, regardless of the distance from the sternum. * **Superficial Epigastric Artery (Incorrect):** This is a branch of the femoral artery found in the inguinal region/lower abdomen; it is not relevant to the thoracic anatomy involved in a thoracotomy. **High-Yield Pearls for NEET-PG:** * **Safe Zone:** For needle thoracocentesis (tension pneumothorax), the needle is inserted in the 2nd intercostal space in the mid-clavicular line or 4th/5th in the mid-axillary line. * **IMA Usage:** The IMA is the "gold standard" conduit for Coronary Artery Bypass Grafting (CABG) due to its superior long-term patency. * **Anatomy:** The IMA terminates in the 6th intercostal space by dividing into the **musculophrenic** and **superior epigastric** arteries.

Question 700: What is the most common cause of bleeding in massive hemothorax following blunt chest trauma?

A. Intercostal vessels (Correct Answer)
B. Bronchial vessels
C. Pulmonary vessels
D. Internal mammary artery

Explanation: ### Explanation **1. Why Intercostal Vessels are Correct:** In blunt chest trauma, a **massive hemothorax** (defined as >1500 mL of blood or >200 mL/hr for 2–4 hours) is most frequently caused by the laceration of **systemic arteries**, specifically the **intercostal vessels**. Because these vessels arise directly from the high-pressure systemic circulation (the aorta), they bleed more profusely and are less likely to stop spontaneously compared to the low-pressure pulmonary circuit. They are also highly vulnerable to injury from rib fractures, which are common in blunt trauma. **2. Why the Other Options are Incorrect:** * **Bronchial vessels (B):** While these are systemic vessels, they are smaller and located deep within the mediastinum/hilum. They are more commonly associated with hemoptysis rather than massive hemothorax. * **Pulmonary vessels (C):** The pulmonary circulation is a **low-pressure system**. Bleeding from the lung parenchyma or pulmonary vessels often self-limits due to the low pressure and the tamponade effect of the expanding lung. * **Internal mammary artery (D):** This is a systemic artery that can cause massive bleeding, but it is less frequently injured in blunt trauma compared to the multiple intercostal arteries lining the rib cage. **3. NEET-PG High-Yield Pearls:** * **Most common cause of Hemothorax (General):** Lung parenchymal laceration (usually self-limiting). * **Most common cause of Massive Hemothorax:** Intercostal artery injury. * **Indication for Emergency Thoracotomy:** * Immediate drainage of **>1500 mL** of blood. * Continued bleeding of **200 mL/hr** for 2–4 consecutive hours. * Patient remains hemodynamically unstable despite resuscitation. * **Initial Management:** Large-bore (28-32 Fr) tube thoracostomy (Chest tube).

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