Trauma Practice Questions

Q: The phenomenon of Kernohan's Notch is associated with which of the following?

Transtentorial herniation. **Explanation:** **Kernohan’s Notch** is a classic "false localizing sign" seen in cases of rapidly increasing intracranial pressure, most commonly due to an expanding supratentorial mass (like an extradural hematoma). 1. **Why Transtentorial Herniation is Correct:** During **uncal (descending transtentorial) herniation**, the medial temporal lobe (uncus) is pushed downwards. This usually compresses the ipsilateral 3rd nerve and peduncle. However, in Kernohan’s phenomenon, the mass effect is so severe that it shifts the entire midbrain laterally, causing the **contralateral cerebral peduncle** to be compressed against the sharp, tough edge of the **tentorium cerebelli** (the "notch"). Since the motor fibers in the peduncle decussate lower down in the medulla, compression of the contralateral peduncle results in **ipsilateral hemiplegia** (paralysis on the same side as the primary lesion). 2. **Analysis of Incorrect Options:** * **Option A:** While 3rd nerve palsy occurs, the hallmark of Kernohan’s is *ipsilateral* hemiplegia, not the standard contralateral presentation. * **Option B:** Subfalcine herniation involves the cingulate gyrus moving under the falx cerebri; it typically causes ACA infarcts, not peduncle compression. * **Option D:** Foramen magnum herniation (tonsillar herniation) leads to respiratory arrest due to medullary compression, not notch-related peduncle injury. **NEET-PG High-Yield Pearls:** * **The Paradox:** Kernohan’s Notch produces **ipsilateral hemiparesis** (same side as the hematoma), which can mislead a surgeon regarding the site of the lesion. * **Triad of Uncal Herniation:** Ipsilateral dilated pupil (3rd nerve), contralateral hemiplegia (standard), and deteriorating consciousness. Kernohan’s flips the motor finding. * **Imaging:** Often seen on MRI as a signal abnormality in the cerebral peduncle opposite the primary mass.

Q: A patient sustained a head injury in a road traffic accident and lost consciousness instantaneously. After a few minutes, he regained consciousness, exhibited spontaneous eye opening without muscular weakness, and was fully aware of his surroundings. The GCS score is E4V5M6. However, the patient continues to complain of headache, dizziness, nausea, faintness, and an episode of emesis. What is the severity of his head injury?

Minor head injury. ### Explanation The patient is presenting with a classic case of **Minor Head Injury (Concussion)**. **1. Why "Minor Head Injury" is correct:** The severity of a traumatic brain injury (TBI) is primarily classified using the **Glasgow Coma Scale (GCS)** score assessed after initial resuscitation: * **Minor (Mild) TBI:** GCS 13–15 * **Moderate TBI:** GCS 9–12 * **Severe TBI:** GCS 3–8 In this scenario, the patient has a **GCS of 15 (E4V5M6)**, which falls squarely into the "Minor" category. The brief loss of consciousness (LOC) followed by a "lucid" recovery with symptoms like headache, nausea, and dizziness are hallmark features of a concussion. Despite the symptoms, the neurological status remains intact. **2. Why the other options are incorrect:** * **Severe head injury:** This is defined by a GCS of 8 or less. These patients are typically comatose, unable to follow commands, and often require intubation for airway protection. * **Intermediate (Moderate) severity:** This corresponds to a GCS of 9–12. These patients usually exhibit significant lethargy or focal neurological deficits, which are absent in this patient. **3. Clinical Pearls for NEET-PG:** * **Concussion definition:** A transient, trauma-induced alteration in mental status (e.g., LOC, amnesia) with or without loss of consciousness, where imaging (CT/MRI) is typically normal. * **The "Lucid Interval":** While this patient regained consciousness, do not confuse a simple concussion with an **Epidural Hematoma (EDH)**. In EDH, the "lucid interval" is followed by rapid deterioration. * **Indications for CT in Minor Head Injury (Canadian CT Head Rule):** GCS 2 episodes of vomiting, or age >65. * **Post-concussion syndrome:** Persistent symptoms like headache and dizziness (as seen here) can last for weeks but do not change the initial injury classification.

Q: The Parkland formula for burns is primarily used to calculate the fluid resuscitation needs, typically with which type of intravenous fluid?

Ringer's lactate. The **Parkland formula** is the most widely used guideline for initial fluid resuscitation in burn patients. The correct answer is **Ringer’s Lactate (RL)** because it is a balanced crystalloid that closely mimics the electrolyte composition of human plasma. ### Why Ringer’s Lactate is the Gold Standard: In major burns, there is a massive systemic inflammatory response leading to "capillary leak," resulting in the loss of water and electrolytes into the interstitial space. RL is preferred because: 1. **Prevents Hyperchloremic Acidosis:** Unlike Normal Saline, RL has a lower chloride concentration, reducing the risk of metabolic acidosis. 2. **Buffering Capacity:** The lactate in RL is metabolized by the liver into bicarbonate, which helps counteract the metabolic acidosis often seen in burn shock. ### Why Other Options are Incorrect: * **Normal Saline (0.9% NaCl):** Contains high levels of chloride (154 mEq/L). Large volumes can lead to hyperchloremic metabolic acidosis and may worsen renal perfusion. * **Glucose Saline / 25% Dextrose:** Glucose-containing fluids are avoided in the first 24 hours of adult burn resuscitation because the stress response causes endogenous hyperglycemia. Dextrose can cause osmotic diuresis, which makes "urine output" an unreliable indicator of fluid resuscitation. ### High-Yield Clinical Pearls for NEET-PG: * **The Formula:** Total fluid in 24 hours = **4 mL × Body Weight (kg) × % Total Body Surface Area (TBSA) burned.** * **Administration:** Give **half** of the calculated volume in the first **8 hours** (from the time of injury, not arrival) and the remaining half over the next 16 hours. * **Monitoring:** The best indicator of adequate fluid resuscitation is **Urine Output** (Target: 0.5 mL/kg/hr in adults; 1 mL/kg/hr in children). * **Modified Brooke Formula:** Uses 2 mL/kg/% TBSA instead of 4 mL.

Q: What is the primary aim of an abbreviated laparotomy?

To ensure adequate haemostasis. **Explanation:** The primary aim of an **abbreviated laparotomy**, also known as **Damage Control Surgery (DCS)**, is to rapidly control life-threatening hemorrhage and limit gastrointestinal contamination. This approach is utilized in critically ill trauma patients who are physiological exhausted and at risk of the "Lethal Triad" (acidosis, hypothermia, and coagulopathy). **1. Why Option D is Correct:** In the setting of severe trauma, the goal is not definitive anatomical repair but **physiological restoration**. Ensuring **adequate haemostasis** (via packing, shunting, or simple ligation) is the most critical step to stop the "bloody vicious cycle." By quickly controlling bleeding and contamination, the surgeon can terminate the operation early to allow the patient to be stabilized in the ICU. **2. Why Other Options are Incorrect:** * **Option A:** While sterile technique is maintained, abbreviated laparotomy actually carries a *higher* risk of infection due to the use of temporary abdominal closures and intra-abdominal packing. * **Option B:** These patients are critically ill and often kept sedated/paralyzed in the ICU; early ambulation is not a priority in the acute damage control phase. * **Option C:** The abdomen is often left open with a temporary dressing (e.g., Bogota bag or VAC); primary wound healing is intentionally delayed until the patient is stable enough for a "re-look" surgery. **High-Yield Clinical Pearls for NEET-PG:** * **The Lethal Triad:** Hypothermia, Acidosis, and Coagulopathy. DCS aims to interrupt this cycle. * **Stages of Damage Control:** 1. **Part I:** Abbreviated laparotomy (Haemostasis & Contamination control). 2. **Part II:** ICU resuscitation (Rewarming & Correction of coagulopathy). 3. **Part III:** Planned re-operation for definitive repair. * **Indications:** pH 10 units).

Q: Which of the following is NOT typically seen in a midface fracture?

Facial shortening. In midface fractures, particularly **Le Fort II and III** types, the anatomical hallmark is **facial lengthening**, not shortening. This occurs because the midface complex is separated from the cranial base and displaced **downward and backward** due to the pull of the pterygoid muscles and the force of gravity. This displacement creates a characteristic "donkey face" or "dish-face" appearance. **Explanation of Options:** * **Facial Shortening (Correct Answer):** This is incorrect because the midface drops inferiorly. Facial shortening is more characteristic of mandibular fractures with significant vertical displacement or specific types of impacted zygomatic fractures, but not classic Le Fort midface injuries. * **Facial Lengthening:** As the fractured segment separates from the skull base and slides down the inclined plane of the sphenoid bone, the vertical height of the face increases. * **Dental Malocclusion:** This is a cardinal sign of midface fractures. The posterior displacement of the maxilla leads to an **"anterior open bite,"** where the posterior teeth meet prematurely, preventing the front teeth from closing. * **CSF Rhinorrhea:** Because Le Fort II and III fractures involve the ethmoid bone and the cribriform plate, dural tears are common, leading to the leakage of cerebrospinal fluid through the nose. **High-Yield Clinical Pearls for NEET-PG:** * **Guerin’s Sign:** Ecchymosis in the region of the greater palatine vessels (seen in Le Fort I). * **Panda Sign/Raccoon Eyes:** Periorbital ecchymosis associated with Le Fort II/III or basilar skull fractures. * **Battle’s Sign:** Post-auricular ecchymosis indicating a fracture of the posterior cranial fossa/petrous temporal bone. * **Dish-face Deformity:** Specifically refers to the concave facial profile seen in Le Fort III fractures due to the recession of the midface.

Q: In a case of acute trauma, what is the best guideline for quick replacement of fluids?

Urine Output. **Explanation:** In the management of acute trauma and hemorrhagic shock, **Urine Output (UOP)** is considered the most reliable and practical bedside indicator for the adequacy of fluid resuscitation. **Why Urine Output is the Correct Answer:** Urine output serves as a direct surrogate for **renal perfusion** and, by extension, global tissue perfusion and cardiac output. In trauma, the body compensates for volume loss by diverting blood away from non-essential organs (like the kidneys) to the heart and brain. A steady urine output of **0.5 ml/kg/hr in adults** (or 1 ml/kg/hr in children) indicates that the kidneys are being adequately perfused, signifying that the circulating volume has been sufficiently restored. **Why Other Options are Incorrect:** * **Pulse (A):** While tachycardia is an early sign of shock, it is non-specific. It can be influenced by pain, anxiety, or medications (e.g., beta-blockers), making it an unreliable guide for the *titration* of fluid replacement. * **Hemoglobin (B):** In acute trauma, hemoglobin levels do not drop immediately because the patient loses whole blood (both cells and plasma). It takes hours for compensatory fluid shifts or resuscitation fluids to dilute the blood and reflect a drop in Hb. * **Central Venous Pressure (D):** CVP measures right atrial pressure. While it can help assess fluid status, it is an invasive procedure and can be misleading in cases of obstructive shock (e.g., tension pneumothorax or cardiac tamponade), which are common in trauma. **Clinical Pearls for NEET-PG:** * **Target UOP:** Adults: 0.5 ml/kg/hr; Children: 1 ml/kg/hr; Infants (<1 year): 2 ml/kg/hr. * **Class of Shock:** Significant drop in UOP is typically seen in **Class III Hemorrhage** (30-40% blood loss). * **Golden Rule:** If a trauma patient is not producing urine despite fluid boluses, the first step is to rule out urethral injury or a blocked catheter before assuming persistent shock.

Q: Which of the following is NOT a sign of cerebral compression?

Hypotension. The correct answer is **Hypotension**. ### **Explanation** Cerebral compression occurs when intracranial pressure (ICP) rises due to space-occupying lesions (like hematomas or edema). The physiological response to increased ICP is governed by the **Cushing’s Reflex**, which consists of a classic triad: 1. **Hypertension** (Widening pulse pressure): The body raises systemic blood pressure to maintain Cerebral Perfusion Pressure (CPP). 2. **Bradycardia**: A reflex response to the sudden rise in systemic blood pressure. 3. **Irregular Respiration**: Due to brainstem compression. Therefore, **Hypertension**, not hypotension, is a sign of cerebral compression. Hypotension in a head injury patient usually suggests internal hemorrhage elsewhere (e.g., abdomen or thorax) rather than the brain injury itself. ### **Analysis of Other Options** * **Bradycardia:** Part of the Cushing’s triad; it occurs as a compensatory baroreceptor response to systemic hypertension. * **Papilloedema:** A classic sign of chronic or subacute increased ICP caused by the mechanical compression of the optic nerve sheath. * **Vomiting:** Specifically "projectile vomiting" without preceding nausea, caused by direct pressure on the postrema area in the medulla. ### **High-Yield Clinical Pearls for NEET-PG** * **Cerebral Perfusion Pressure (CPP) Formula:** $CPP = MAP - ICP$. To keep CPP constant when ICP rises, the Mean Arterial Pressure (MAP) must increase. * **Earliest Sign of Compression:** Altered level of consciousness (GCS) or an ipsilateral dilated pupil (due to 3rd nerve compression). * **Late Sign:** Cushing’s Triad is often a late/pre-terminal sign indicating impending transtentorial herniation. * **Management:** Mannitol (20%), hypertonic saline, and head elevation (30°) are used to reduce ICP.

Question 1

The phenomenon of Kernohan's Notch is associated with which of the following?

Accepted Answer

Transtentorial herniation

Answer

Third nerve palsy with contralateral hemiplegia

Answer

Subfalcine herniation

Answer

Foramen magnum fracture

Question 2

What is the recommended treatment for a mandibular fracture located between the incisors?

Accepted Answer

Risdon wiring

Answer

Essig wiring

Answer

Cap splint with circum-mandibular wiring

Answer

Transosseous wiring

Question 3

A patient sustained a head injury in a road traffic accident and lost consciousness instantaneously. After a few minutes, he regained consciousness, exhibited spontaneous eye opening without muscular weakness, and was fully aware of his surroundings. The GCS score is E4V5M6. However, the patient continues to complain of headache, dizziness, nausea, faintness, and an episode of emesis. What is the severity of his head injury?

Accepted Answer

Minor head injury

Answer

Severe head injury

Answer

Intermediate severity

Answer

None of the above

Question 4

A 38-year-old male patient presents after a road traffic accident with multiple rib fractures, tenderness in the left chest wall and left hypochondrium, guarding, and rigidity. X-ray shows free fluid in the abdomen. What is the most likely diagnosis?

Accepted Answer

Splenic injury

Answer

Liver injury

Answer

Lung injury

Answer

Diaphragmatic injury

Question 5

The Parkland formula for burns is primarily used to calculate the fluid resuscitation needs, typically with which type of intravenous fluid?

Accepted Answer

Ringer's lactate

Answer

Glucose saline

Answer

Normal saline

Answer

25% dextrose

Question 6

What is the primary aim of an abbreviated laparotomy?

Accepted Answer

To ensure adequate haemostasis

Answer

To decrease the chance of infection

Answer

To facilitate early ambulation

Answer

To promote early wound healing

Question 7

Which of the following is NOT typically seen in a midface fracture?

Accepted Answer

Facial shortening

Answer

Facial lengthening

Answer

Dental malocclusion

Answer

Cerebrospinal fluid (CSF) rhinorrhea

Question 8

In a case of acute trauma, what is the best guideline for quick replacement of fluids?

Accepted Answer

Urine Output

Answer

Pulse

Answer

Hemoglobin

Answer

Central Venous Pressure (CVP)

Question 9

Which of the following is NOT a sign of cerebral compression?

Accepted Answer

Hypotension

Answer

Bradycardia

Answer

Papilloedema

Answer

Vomiting

Question 10

Tension pneumothorax results in all of the following except?

Accepted Answer

Respiratory alkalosis

Answer

Decreased cardiac output

Answer

Decreased venous return

Answer

Absent breath sounds

Trauma — MCQs

Trauma — MCQs

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