Trauma Practice Questions

Q: In which of the following conditions is surgery not useful?

Cerebral edema. ### Explanation The management of head injuries is a high-yield topic in NEET-PG, focusing on the distinction between **surgical (evacuatable)** and **medical (diffuse)** pathologies. **Why Cerebral Edema is the Correct Answer:** Cerebral edema is a diffuse physiological response to injury characterized by an increase in brain volume due to fluid accumulation. Since it is a global parenchymal process rather than a focal mass lesion, it cannot be "removed" surgically. The primary management is **medical**, utilizing osmotic diuretics (Mannitol or Hypertonic Saline), head elevation, and hyperventilation to reduce intracranial pressure (ICP). Surgery (like decompressive craniectomy) is only a last-resort measure to create space, but it does not treat the edema itself. **Analysis of Incorrect Options:** * **Depressed Fracture:** Surgery is indicated if the depression is greater than the thickness of the skull, if there is an underlying dural tear, or if it is a compound fracture (to debride and prevent infection). * **Extradural Hemorrhage (EDH):** This is a neurosurgical emergency. Since the blood is trapped between the skull and dura, urgent **burr-hole evacuation or craniotomy** is life-saving to prevent uncal herniation. * **Subdural Hemorrhage (SDH):** Acute SDH with a midline shift >5mm or clot thickness >10mm requires surgical evacuation via craniotomy to relieve mass effect. **Clinical Pearls for NEET-PG:** * **EDH:** Classic "Lucid Interval"; biconvex/lens-shaped on CT; usually involves the **Middle Meningeal Artery**. * **SDH:** Crescent-shaped on CT; involves tearing of **bridging veins**. * **Cushing’s Triad (Sign of high ICP):** Hypertension, Bradycardia, and Irregular Respiration. * **First-line medical management for raised ICP:** Mannitol (0.25–1 g/kg IV).

Q: What is the normal cerebral blood flow per 100 grams of brain tissue?

55 ml/min. **Explanation:** The correct answer is **55 ml/min** (Option B). Cerebral Blood Flow (CBF) is a critical parameter in neurotrauma management, representing the volume of blood delivered to the brain per unit of time. In a healthy adult, the average CBF is approximately **50 to 55 ml per 100 grams of brain tissue per minute**. This flow is tightly regulated by **autoregulation**, ensuring constant perfusion despite fluctuations in Mean Arterial Pressure (MAP) between 50 and 150 mmHg. **Analysis of Options:** * **Option A (45 ml/min):** While close, this is slightly below the standard physiological average. However, it is important to note that gray matter receives higher flow (~70-80 ml) than white matter (~20 ml). * **Option B (55 ml/min):** This is the standard textbook value for global CBF used in surgical and physiological examinations. * **Options C & D (65-75 ml/min):** These values represent hyperperfusion or luxury perfusion, which is not the baseline physiological state for the entire brain. **Clinical Pearls for NEET-PG:** * **Critical Thresholds:** * **Ischemic Penumbra:** CBF < 20 ml/100g/min (functional impairment occurs). * **Irreversible Infarction:** CBF < 10 ml/100g/min (cell death/ionic pump failure). * **Cerebral Perfusion Pressure (CPP):** Calculated as **MAP – ICP**. In trauma management (ATLS/BTF guidelines), the goal is to maintain CPP between **60–70 mmHg**. * **Chemical Regulation:** CBF is most sensitive to **PaCO₂**. Hyperventilation causes hypocapnia, leading to cerebral vasoconstriction and a subsequent decrease in ICP—a high-yield maneuver for acute herniation.

Q: A 40-year-old male patient sustained a head injury after being hit by a car and was brought to the casualty. On examination, the patient is drowsy, aphasic, opens eyes on deep pain stimulus, and withdraws from pain stimulus. What is his Glasgow Coma Scale (GCS) score?

7. ### Explanation The Glasgow Coma Scale (GCS) is a clinical tool used to assess the level of consciousness based on three parameters: Eye opening (E), Verbal response (V), and Motor response (M). The total score ranges from 3 to 15. **Breakdown of this patient’s GCS:** * **Eye Opening (E):** The patient opens eyes only on "deep pain stimulus." This corresponds to **E2**. (E1: None, E2: To pain, E3: To sound, E4: Spontaneous). * **Verbal Response (V):** The patient is "aphasic" (unable to produce speech). In the context of trauma assessment, no verbal output corresponds to **V1**. (V1: None, V2: Incomprehensible sounds, V3: Inappropriate words, V4: Confused, V5: Oriented). * **Motor Response (M):** The patient "withdraws from pain stimulus." This corresponds to **M4**. (M1: None, M2: Extension/Decerebrate, M3: Abnormal flexion/Decorticate, M4: Withdrawal, M5: Localizes pain, M6: Obeys commands). **Total GCS = E2 + V1 + M4 = 7.** #### Analysis of Incorrect Options: * **Option A (8):** Incorrect calculation; likely misinterpreting "aphasic" as "incomprehensible sounds" (V2) or eye-opening to speech (E3). * **Option C (6):** Incorrect calculation; likely under-scoring the motor response (M3 instead of M4). * **Option D (10):** Incorrect calculation; suggests a much higher level of consciousness (e.g., E3, V3, M4). #### Clinical Pearls for NEET-PG: * **Severity Classification:** GCS 13–15 (Mild), 9–12 (Moderate), **≤8 (Severe head injury)**. * **Management Rule:** "GCS of 8, Intubate!" (Patients with a score of 8 or less usually require definitive airway protection). * **Most Important Component:** The **Motor score** is the most reliable predictor of clinical outcome. * **Note on Aphasia:** If a patient is intubated, the verbal score is recorded as **1T**.

Q: Which of the following is/are a method for measuring blood loss?

All of the above. **Explanation:** Accurate estimation of blood loss is critical in trauma and surgical settings to guide fluid resuscitation and prevent hemorrhagic shock. The correct answer is **D (All of the above)** because each option represents a validated clinical method for quantifying blood loss. 1. **Weighing Swabs (Option A):** This is a standard intraoperative technique. By subtracting the known dry weight of a surgical swab from its weight when soaked with blood (1 gram ≈ 1 mL), clinicians can estimate blood loss. However, this may underestimate loss due to evaporation or overestimate it if irrigation fluid is present. 2. **Measurement of Swelling in Closed Fractures (Option B):** In trauma, significant occult bleeding occurs into soft tissues. For example, a closed femoral shaft fracture can result in 1–1.5 liters of blood loss, visible as an increase in thigh circumference. Clinical formulas use the limb's volume increase to estimate this "hidden" loss. 3. **Measurement of Blood Clot (Option C):** The size of a blood clot can provide a rough bedside estimate. A clot the size of a closed fist is approximately equal to **500 mL** of blood. **Why other options are not "wrong":** In a "Multiple Correct" or "All of the above" format, if more than one method is clinically recognized, the collective option is the most accurate choice. **High-Yield Clinical Pearls for NEET-PG:** * **The "Fist" Rule:** 1 fist-sized clot ≈ 500 mL blood. * **Fracture Blood Loss Estimates:** * Rib: 125 mL * Radius/Ulna: 250–500 mL * Humerus: 500–750 mL * Tibia/Fibula: 500–1000 mL * **Femur: 1000–1500 mL** * **Pelvis: 1500–3000+ mL (Life-threatening)** * **Class of Shock:** Remember that clinical signs (tachycardia, hypotension) usually manifest only after >15-30% of blood volume is lost (Class II/III Shock).

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).

Question 1

In which of the following conditions is surgery not useful?

Accepted Answer

Cerebral edema

Answer

Depressed fracture

Answer

Extradural hemorrhage

Answer

Subdural hemorrhage

Question 2

A hemodynamically unstable patient sustains a fracture of the left femoral shaft following a road traffic accident. The patient also exhibits guarding and rigidity in the abdomen. What is the next step in management?

Accepted Answer

Stabilize the fracture and monitor the patient, then perform eFAST

Answer

Open reduction and fixation of femur

Answer

CECT abdomen

Answer

Stabilize the fracture only

Question 3

What is the normal cerebral blood flow per 100 grams of brain tissue?

Accepted Answer

55 ml/min

Answer

45 ml/min

Answer

65 ml/min

Answer

75 ml/min

Question 4

A 40-year-old male patient sustained a head injury after being hit by a car and was brought to the casualty. On examination, the patient is drowsy, aphasic, opens eyes on deep pain stimulus, and withdraws from pain stimulus. What is his Glasgow Coma Scale (GCS) score?

Accepted Answer

7

Answer

8

Answer

6

Answer

10

Question 5

Which of the following is/are a method for measuring blood loss?

Accepted Answer

All of the above

Answer

Weighing swabs

Answer

Measurement of swelling in closed fractures

Answer

Measurement of blood clot

Question 6

In the pediatric age group, what is the most common feature of polytrauma?

Accepted Answer

Hypothermia

Answer

Hypotension

Answer

Hypovolemic shock

Answer

Hypoxemia

Question 7

Following traumatic peripheral nerve transection, at what rate does regrowth usually occur?

Accepted Answer

1 mm per day

Answer

0.1 mm per day

Answer

5 mm per day

Answer

1 cm per day

Question 8

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 9

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 10

What is the most common site of traumatic aortic rupture?

Accepted Answer

Descending thoracic aorta

Answer

Arch of aorta

Answer

Aortic root

Trauma — MCQs

Trauma — MCQs

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