Trauma Practice Questions

Q: A young male is brought unconscious to the hospital with external injuries. CT brain showed no midline shift but multiple tiny hemorrhages in the brain. What is the likely diagnosis?

Diffuse axonal injuries. **Explanation:** **Diffuse Axonal Injury (DAI)** is the most likely diagnosis. It occurs due to high-velocity rotational acceleration-deceleration forces (e.g., RTA), causing shearing of axons at the interface of tissues with different densities. 1. **Why it is correct:** The clinical hallmark of DAI is a patient who is **unconscious** (low GCS) immediately following trauma, but whose **CT scan appears disproportionately normal** or shows no midline shift. Characteristic CT/MRI findings include **multiple punctate (tiny) hemorrhages** at the grey-white matter junction, corpus callosum, or brainstem. While CT is often the first investigation, **MRI (specifically Susceptibility Weighted Imaging - SWI)** is the gold standard for diagnosis. 2. **Why other options are incorrect:** * **Cerebral Contusion:** These are "bruises" of the brain, usually seen as "salt and pepper" appearance (heterogeneous areas of hemorrhage and edema) on CT, typically located at the poles (frontal/temporal) due to coup-contrecoup injuries. * **Cerebral Laceration:** Involves a physical tear in the brain tissue, usually associated with depressed skull fractures or penetrating trauma; it would show significant focal damage on CT. * **Multiple Infarcts:** These follow a vascular distribution and are typically seen in embolic events or elderly patients, not acutely following trauma in a young male. **High-Yield Pearls for NEET-PG:** * **Most common site for DAI:** Grey-white matter junction (Grade I), followed by Corpus Callosum (Grade II) and Brainstem (Grade III). * **Imaging of choice:** MRI (SWI or Gradient Echo sequences) is more sensitive than CT. * **Prognosis:** Often poor; it is a leading cause of persistent vegetative state after trauma.

Q: Subcutaneous emphysema may be found in which of the following conditions?

All of the above. **Explanation:** Subcutaneous emphysema occurs when air infiltrates the subcutaneous layer of the skin. This typically happens when air escapes from a gas-containing organ (like the lungs, trachea, or esophagus) due to a breach in the mucosal or pleural integrity. * **Tracheostomy:** This is a common surgical cause. If the skin incision is closed too tightly around the tracheostomy tube or if there is a malposition of the tube, air can be forced into the surrounding soft tissues of the neck during expiration or coughing. * **Heimlich Maneuver:** While rare, the forceful abdominal thrusts can lead to a sudden increase in intrathoracic pressure, potentially causing alveolar rupture (Macklin effect) or, in extreme cases, esophageal perforation. This allows air to track into the mediastinum and subsequently the subcutaneous tissues. * **Chest Injury:** This is the most frequent clinical cause. Both blunt and penetrating trauma can cause a pneumothorax. If the parietal pleura is breached, air escapes from the pleural space into the chest wall. It is often a hallmark sign of a tension pneumothorax or a rib fracture puncturing the lung. **Clinical Pearls for NEET-PG:** 1. **Palpation:** The classic physical finding is **crepitus** (a "Rice Krispies" or crackling sensation) under the skin. 2. **Hamman’s Sign:** A crunching sound heard over the precordium synchronous with the heartbeat, indicating pneumomediastinum (often associated with subcutaneous emphysema). 3. **Management:** Usually, it is self-limiting as the body reabsorbs the air once the underlying leak is sealed. However, if it spreads rapidly to the neck, it can theoretically cause airway compression. 4. **Imaging:** On a chest X-ray, it appears as radiolucent (black) streaks outlining muscle fibers (e.g., the **Ginkgo leaf sign** over the pectoralis major).

Q: What is the most common site of traumatic aortic rupture?

Descending thoracic aorta. **Explanation:** The most common site of traumatic aortic rupture is the **descending thoracic aorta**, specifically at the **aortic isthmus**. This is the segment located just distal to the origin of the left subclavian artery, where the ligamentum arteriosum attaches. **Why it is the correct answer:** The mechanism is based on **differential deceleration**. During a high-velocity impact (e.g., a motor vehicle accident or fall from height), the heart and the aortic arch are relatively mobile, whereas the descending aorta is fixed to the posterior thoracic wall. The aortic isthmus acts as a transition point between the mobile and fixed segments. The resulting shear stress at this point leads to a tear, most commonly involving the intima and media. **Analysis of Incorrect Options:** * **Arch of aorta:** While the arch is subject to stress, it is more mobile than the descending aorta and less prone to the specific shearing forces seen at the isthmus. * **Aortic root:** Ruptures here are rare in blunt trauma and are more commonly associated with penetrating injuries or underlying pathologies like Marfan syndrome (dissection). * **Ascending aorta:** This is the second most common site but occurs much less frequently than the isthmus in blunt trauma survivors. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CT Angiography (CTA) is the investigation of choice in hemodynamically stable patients. * **Chest X-ray findings:** Look for **widened mediastinum (>8cm)**, obliteration of the aortic knob, and deviation of the nasogastric tube to the right. * **Survival:** Approximately 80-85% of patients die at the scene; for those who reach the hospital, the hematoma is often contained by the adventitia (pseudoaneurysm).

Q: Which one of the following statements is not true regarding the Glasgow Coma Scale?

All of the above statements are true.. The **Glasgow Coma Scale (GCS)** is a standardized clinical tool used to assess the level of consciousness in patients with head injuries or acute neurological insults. It evaluates three specific parameters: **Eye Opening (E)**, **Verbal Response (V)**, and **Motor Response (M)**. ### Explanation of Options: * **Option A (Scores range from 3 to 15):** This is **true**. The minimum score for any individual component is 1, and the maximum total score is 15 (E4 + V5 + M6). A score of 0 is impossible; even a brain-dead patient scores a 3. * **Option B (Motor response maximum 6 points):** This is **true**. The motor component (M) is scored from 1 (no response) to 6 (obeys commands). It is considered the most reliable predictor of outcome. * **Option C (Eye opening maximum 4 points):** This is **true**. Eye opening (E) is scored from 1 (none) to 4 (spontaneous). * **Option D (Correct Answer):** Since all the individual statements (A, B, and C) accurately describe the components and scoring of the GCS, this is the correct choice. ### High-Yield Clinical Pearls for NEET-PG: * **Mnemonic (EVM 456):** Eye = 4, Verbal = 5, Motor = 6. * **Severity Classification:** * **GCS 13–15:** Mild Head Injury. * **GCS 9–12:** Moderate Head Injury. * **GCS ≤ 8:** Severe Head Injury (Indicative of Coma; "GCS of 8, Intubate"). * **Modified GCS:** If a patient is intubated, the Verbal score is recorded as **'T'** (e.g., GCS 10T). * **GCS-P:** A newer variant that includes **Pupillary reactivity** (GCS score minus number of non-reactive pupils).

Q: A Grade 2 burn indicates involvement of which layer of the skin?

Dermis. ### Explanation The classification of burns is based on the **depth of tissue destruction**. A **Grade 2 (Partial-thickness)** burn involves the entire epidermis and extends into the underlying **dermis**. * **Why Dermis is Correct:** Grade 2 burns are subdivided into superficial and deep partial-thickness. Superficial partial-thickness burns involve the papillary dermis and are characterized by painful blisters. Deep partial-thickness burns involve the reticular dermis; these may appear waxy white and have reduced sensation. Because the dermis contains sensory nerve endings and microvasculature, these burns are typically very painful and show blanching. **Analysis of Incorrect Options:** * **A. Epidermis:** This corresponds to a **Grade 1 (Superficial)** burn. A classic example is a sunburn. It involves only the outermost layer, presenting with erythema and pain but no blisters. * **C. Subcutaneous tissue:** This corresponds to a **Grade 3 (Full-thickness)** burn. The destruction extends through the entire dermis into the subcutaneous fat. These burns are leathery (eschar), non-blanching, and painless due to the destruction of nerve endings. * **D. Deep fascia:** This corresponds to a **Grade 4** burn. These are deep injuries involving underlying structures like fascia, muscle, or bone, often seen in high-voltage electrical injuries. **High-Yield Clinical Pearls for NEET-PG:** 1. **Wallace Rule of Nines:** Used to estimate Total Body Surface Area (TBSA) in adults. Note that the head is 9% in adults but 18% in infants. 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. **Fluid of Choice:** Ringer’s Lactate is the preferred crystalloid for resuscitation. 4. **Pain Paradox:** Grade 1 and 2 burns are highly painful; Grade 3 burns are anesthetic (painless).

Q: Flail chest means fracture of:

Four ribs on two sides. ### Explanation **Concept and Definition** Flail chest is a clinical diagnosis defined by the fracture of **two or more adjacent ribs** in **two or more places** along their length. This creates a "flail segment"—a portion of the chest wall that is no longer in bony continuity with the rest of the thoracic cage. This segment moves **paradoxically**: it sucks inward during inspiration (due to negative intrathoracic pressure) and bulges outward during expiration. **Why Option C is Correct** Option C ("Four ribs on two sides") is the most accurate description among the choices because it fulfills the criteria of multiple fractures per rib. If four ribs are fractured at two different sites (sides) each, it creates a large, unstable segment that results in the classic clinical presentation of flail chest. **Analysis of Incorrect Options** * **Option A & B:** A single fracture in two ribs (whether on the same or opposite sides) does not create a free-floating segment. The chest wall remains stable. * **Option D:** While fracturing all ribs would certainly cause instability, it is not the minimum definition required for the diagnosis. **Clinical Pearls for NEET-PG** * **Primary Pathology:** The main cause of respiratory failure in flail chest is not the paradoxical movement itself, but the underlying **Pulmonary Contusion**. * **Management:** The mainstay of treatment is **adequate analgesia** (often epidural) and aggressive pulmonary toilet. Mechanical ventilation is reserved for patients with respiratory failure, not for "internal splinting" of the fractures. * **Associated Findings:** Always look for associated injuries like hemothorax or pneumothorax. * **Radiology:** Flail chest is a **clinical diagnosis**, though X-rays or CT scans are used to confirm the number and location of fractures.

Q: For the evaluation of blunt abdominal trauma, which of the following imaging modalities is ideal?

Computed tomography. In blunt abdominal trauma (BAT), **Computed Tomography (CT) with IV contrast** is the gold standard and the imaging modality of choice for hemodynamically stable patients. ### Why CT is the Correct Answer: * **Superior Sensitivity and Specificity:** CT is highly accurate in identifying and grading solid organ injuries (liver, spleen, kidneys) and detecting hemoperitoneum. * **Retroperitoneal Evaluation:** Unlike ultrasound, CT can reliably visualize the retroperitoneum, including the pancreas, duodenum, and major vessels. * **Hollow Viscus Injury:** It is the most sensitive tool for detecting signs of bowel injury (e.g., wall thickening, free air, or mesenteric hematoma). * **Whole-Body Imaging:** In polytrauma, CT allows for a "Pan-scan" to evaluate the head, chest, and pelvis simultaneously. ### Why Other Options are Incorrect: * **A. Ultrasonography:** While **FAST (Focused Assessment with Sonography for Trauma)** is the initial screening tool for hemodynamically unstable patients, it cannot grade organ injuries or reliably detect retroperitoneal pathology. * **C. Nuclear Scintigraphy:** This is too time-consuming and lacks the anatomical detail required for acute trauma management. * **D. Magnetic Resonance Imaging:** MRI is contraindicated in emergency settings due to long scan times, difficulty in monitoring unstable patients, and incompatibility with metallic life-support equipment. ### High-Yield Clinical Pearls for NEET-PG: * **Hemodynamically Unstable + Positive FAST:** Proceed directly to **Laparotomy**. * **Hemodynamically Stable:** **CECT (Contrast-Enhanced CT)** is the investigation of choice. * **CT "Shock Bowel":** Look for diffuse small bowel wall thickening and hyper-enhancement, indicating hypovolemic shock. * **Splenic Injury:** The spleen is the most commonly injured organ in blunt abdominal trauma.

Q: Which of the following are signs of tentorial herniation?

All of the above. Tentorial herniation (specifically central or uncal herniation) occurs when increased intracranial pressure (ICP) forces brain tissue through the tentorial notch [2], [3]. This leads to the compression of vital brainstem structures and cranial nerves, manifesting in the signs listed. * **Sunset Sign:** This refers to the downward deviation of the eyes where the iris is partially covered by the lower eyelid. It occurs due to pressure on the midbrain tectum (specifically the superior colliculi) and is a classic sign of increased ICP and obstructive hydrocephalus. * **Sixth Nerve Palsy:** The Abducens nerve (CN VI) has a long intracranial course. Increased ICP causes the nerve to be stretched against the petrous part of the temporal bone or compressed during herniation, leading to lateral rectus palsy (false localizing sign) [2]. * **Decerebrate Rigidity:** As herniation progresses, it causes midbrain and upper pontine dysfunction. This results in an abnormal posturing characterized by extension of the elbows and knees, internal rotation of the shoulders, and plantar flexion, indicating severe brainstem distress [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Uncal Herniation Triad:** Ipsilateral dilated pupil (CN III compression), contralateral hemiparesis (compression of the cerebral peduncle), and deteriorating consciousness [1], [2]. * **Kernohan’s Notch Phenomenon:** A paradoxical sign where the herniating uncus displaces the brainstem, compressing the *opposite* cerebral peduncle, resulting in **ipsilateral** hemiparesis [2]. * **Cushing’s Triad:** Hypertension, bradycardia, and irregular respirations—a late sign of impending herniation [2].

Question 1

A young male is brought unconscious to the hospital with external injuries. CT brain showed no midline shift but multiple tiny hemorrhages in the brain. What is the likely diagnosis?

Accepted Answer

Diffuse axonal injuries

Answer

Cerebral contusion

Answer

Cerebral laceration

Answer

Multiple infarcts

Question 2

Subcutaneous emphysema may be found in which of the following conditions?

Accepted Answer

All of the above

Answer

Tracheostomy

Answer

Heimlich maneuver

Answer

Chest injury

Question 3

What is the most common site of traumatic aortic rupture?

Accepted Answer

Descending thoracic aorta

Answer

Arch of aorta

Answer

Aortic root

Question 4

How should a displaced mandibular fracture in a child be managed?

Accepted Answer

Early mobilization

Answer

Circum mandibular wiring

Answer

Intermaxillary fixation

Answer

Transosseous wiring

Question 5

Which one of the following statements is not true regarding the Glasgow Coma Scale?

Accepted Answer

All of the above statements are true.

Answer

Scores range from 3 to 15.

Answer

The motor response component has a maximum of 6 points.

Answer

The eye opening component has a maximum of 4 points.

Question 6

A 60-year-old man presents to the emergency department following an accident with engorged neck veins, pallor, and a rapid pulse. He has muffled heart sounds. What is the likely diagnosis?

Accepted Answer

Aortic dissection

Answer

Cardiac tamponade

Answer

Pneumothorax

Answer

Diaphragmatic rupture

Question 7

A Grade 2 burn indicates involvement of which layer of the skin?

Accepted Answer

Dermis

Answer

Epidermis

Answer

Subcutaneous tissue

Answer

Deep fascia

Question 8

Flail chest means fracture of:

Accepted Answer

Four ribs on two sides

Answer

Two ribs on the same side

Answer

Two ribs on opposite sides

Answer

All ribs

Question 9

For the evaluation of blunt abdominal trauma, which of the following imaging modalities is ideal?

Accepted Answer

Computed tomography

Answer

Ultrasonography

Answer

Nuclear scintigraphy

Answer

Magnetic resonance imaging

Question 10

Which of the following are signs of tentorial herniation?

Accepted Answer

All of the above

Answer

Sunset sign

Answer

Sixth nerve palsy

Answer

Decerebrate rigidity

Trauma — MCQs

Trauma — MCQs

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