Trauma Practice Questions

Q: A 30-year-old patient with a head injury presented to the emergency department. NCCT findings are provided. All of the following are true about this condition except:

Full recovery is rare even after treatment. ***Full recovery is rare even after treatment*** - This statement is **incorrect** - full recovery is actually **common** with prompt surgical treatment of epidural hematoma. - Early recognition and **immediate surgical evacuation** leads to excellent prognosis in most cases, making this the exception among the given statements. *Lucid interval is positive* - **Classic feature** of epidural hematoma where patient initially loses consciousness, then appears normal before deteriorating. - Occurs due to **progressive hematoma expansion** causing delayed compression of brain structures. *Immediate surgical evacuation should be done* - **Emergency craniotomy** and hematoma evacuation is the standard treatment for epidural hematoma. - Delay in surgical intervention can lead to **brain herniation** and death due to increasing intracranial pressure. *Arterial bleeding* - Epidural hematoma typically results from **middle meningeal artery** rupture following temporal bone fracture. - **High-pressure arterial bleeding** causes rapid hematoma formation, unlike venous subdural hematomas.

Q: A 50-year-old male presents with severe vomiting and retching accompanied by sharp substernal pain. Four hours later, a chest X-ray reveals air density outlining the left descending aorta. What is the optimum strategy for his care?

Immediate thoracotomy. **Explanation:** The clinical presentation of severe vomiting followed by sharp substernal pain, combined with the radiographic finding of air outlining the aorta (**V-sign of Naclerio**), is pathognomonic for **Boerhaave Syndrome** (spontaneous transmural esophageal perforation). **1. Why Immediate Thoracotomy is Correct:** Boerhaave syndrome is a surgical emergency. The perforation leads to the leakage of gastric contents into the mediastinum, causing fulminant mediastinitis, sepsis, and shock. Within the first 24 hours, the treatment of choice is **immediate primary surgical repair** (thoracotomy) and mediastinal debridement. The prognosis worsens significantly with every hour of delay. **2. Why Incorrect Options are Wrong:** * **Option B:** While MI can present with chest pain, the history of retching and the presence of pneumomediastinum on X-ray point directly to esophageal rupture. Delaying surgery for cardiac enzymes increases mortality. * **Option C:** A chest tube alone is insufficient for a transmural rupture as it does not address the esophageal defect or the contaminated mediastinum. * **Option D:** While diagnosis can be confirmed via Gastrografin swallow, **flexible endoscopy is generally avoided** in suspected Boerhaave syndrome because the insufflation of air can worsen the pneumomediastinum and tension pneumothorax. **High-Yield Clinical Pearls for NEET-PG:** * **Mackler’s Triad:** Vomiting, chest pain, and subcutaneous emphysema. * **Most common site:** Left posterolateral aspect of the distal esophagus (2-3 cm above the GE junction). * **Radiology:** Look for the "V-sign of Naclerio" (air between the diaphragm and aorta) and "Hamman’s Crunch" (systolic crunching sound on auscultation). * **Gold Standard Diagnosis:** Water-soluble contrast (Gastrografin) swallow.

Q: After an open injury, what is the optimum time for nerve suture?

When the wound is free from infection. **Explanation:** The timing of nerve repair after an open injury is primarily dictated by the **nature of the wound** and the **mechanism of injury**. In open trauma, the risk of contamination and subsequent infection is high. **Why Option D is Correct:** The fundamental principle of nerve surgery is that a nerve suture should only be attempted in a **clean, well-vascularized field**. If a nerve is sutured in an infected environment, the resulting inflammatory response leads to excessive fibrosis and scarring at the suture site. This prevents axonal regeneration across the repair, leading to a failed functional outcome. Therefore, the "optimum time" in the context of an open, potentially contaminated injury is as soon as the wound is confirmed to be healthy and free from infection. **Analysis of Incorrect Options:** * **A. Immediately:** While "Primary Repair" (within 24 hours) is ideal for clean, sharp incised wounds (e.g., a surgical blade or glass cut), it is contraindicated in ragged, contaminated open injuries where the extent of nerve contusion is not yet clear. * **B & C. Within one month / 1-2 months:** These represent "Delayed Primary" or "Secondary" repairs. While these are common timeframes, they are arbitrary. The biological prerequisite is wound healing; if a wound remains infected at two months, suturing the nerve would still result in failure. **NEET-PG High-Yield Pearls:** * **Primary Repair:** Best for clean, sharp transections. * **Delayed Repair (3–6 weeks):** Preferred for blunt trauma or crush injuries. This allows the zone of injury (extent of scarring) to become clearly demarcated, ensuring the surgeon trims back to healthy fascicles. * **Wallerian Degeneration:** Begins within 24–48 hours post-injury. * **Regeneration Rate:** Nerve fibers typically regrow at a rate of **1 mm/day**.

Q: In burns, when does pus formation typically occur?

3-5 days. **Explanation:** In burn injuries, the formation of pus is primarily associated with the **liquefaction of the burn eschar** due to bacterial colonization. While a burn wound is initially sterile due to the heat of the injury, it becomes colonized by skin flora and environmental pathogens within 48 to 72 hours. By **3 to 5 days**, the bacterial load (commonly *Staphylococcus aureus* or *Pseudomonas*) increases significantly, leading to the inflammatory response and enzymatic breakdown of necrotic tissue, which manifests clinically as pus. **Analysis of Options:** * **A (2-3 days):** This is the period of initial bacterial colonization. While the wound is no longer sterile, there is usually insufficient leukocytic infiltration and tissue liquefaction to form visible pus. * **B (3-5 days):** **Correct.** This timeframe aligns with the peak of the inflammatory phase and the establishment of a significant bacterial count in the eschar, leading to suppuration. * **C & D (2-4 weeks):** By this stage, if the burn is deep, the eschar has typically already separated (sloughing). These timeframes are more associated with the formation of granulation tissue or the development of chronic wound infections/sepsis rather than the initial onset of pus. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of early infection:** *Staphylococcus aureus*. * **Most common cause of late/opportunistic infection:** *Pseudomonas aeruginosa* (characterized by a greenish-blue discharge and a fruity odor). * **Burn Wound Sepsis:** Defined as a bacterial count >$10^5$ organisms per gram of tissue. * **Silver Sulfadiazine:** The most commonly used topical antibiotic; however, it can cause transient leukopenia. * **Mafenide Acetate:** Used for thick eschars and ear burns (penetrates cartilage) but can cause metabolic acidosis via carbonic anhydrase inhibition.

Q: Which of the following are causes of secondary brain injury?

All of the above. **Explanation:** Traumatic Brain Injury (TBI) is divided into two phases: **Primary injury**, which occurs at the moment of impact (e.g., contusions, diffuse axonal injury), and **Secondary injury**, which refers to the subsequent biochemical and physiological cascades that further damage brain tissue. The core principle in managing TBI is the prevention of secondary brain injury by maintaining adequate **Cerebral Perfusion Pressure (CPP)** and oxygenation. * **Option A (Pyrexia and Hypotension):** Hypotension reduces the Mean Arterial Pressure (MAP), directly lowering CPP ($CPP = MAP - ICP$). Pyrexia (fever) increases the cerebral metabolic rate of oxygen ($CMRO_2$), exacerbating the mismatch between oxygen supply and demand. * **Option B (Seizures and Metabolic Disturbance):** Seizures cause a massive spike in metabolic demand and can increase intracranial pressure (ICP). Metabolic disturbances (like hyponatremia or hyperglycemia) lead to cerebral edema and neuronal toxicity. * **Option C (Low CPP):** Low CPP leads to cerebral ischemia. If the brain's autoregulation is impaired (common in trauma), any drop in CPP results in immediate infarction of vulnerable "penumbra" tissue. Since all these factors contribute to the worsening of the initial insult, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **The "Lethal Duo":** Hypotension (Systolic BP < 90 mmHg) and Hypoxia ($PaO_2$ < 60 mmHg) are the two most significant avoidable causes of secondary brain injury. * **Cushing’s Triad (Sign of increased ICP):** Hypertension, Bradycardia, and Irregular Respiration. * **Target CPP:** In TBI management, the goal is typically to maintain CPP between **60–70 mmHg**. * **Monroe-Kellie Doctrine:** The cranial vault is a fixed volume; an increase in one component (blood, CSF, or brain/mass) must be compensated by a decrease in another, or ICP will rise.

Q: Kernohan's notch is seen in which organ injury?

Brain. **Explanation:** **Kernohan’s notch** is a classic neurosurgical phenomenon associated with **uncal herniation** (a type of transtentorial herniation). When a space-occupying lesion (like an extradural or subdural hematoma) causes the medial temporal lobe (uncus) to shift, it pushes the midbrain against the sharp, rigid edge of the **contralateral tentorial incisura**. This mechanical compression creates a groove or "notch" in the cerebral peduncle, known as Kernohan’s notch. **Why Option A is correct:** The injury occurs in the **brain**. Specifically, compression of the contralateral cerebral peduncle affects the descending corticospinal fibers *above* their decussation. This results in **ipsilateral hemiparesis** (weakness on the same side as the primary lesion), which is considered a **false localizing sign**. **Why other options are incorrect:** * **Options B, C, and D:** Lungs and Liver (Right/Left lobes) are solid or visceral organs prone to blunt or penetrating trauma (e.g., Couinaud segments in liver trauma). However, "Kernohan’s notch" is a specific anatomical term reserved exclusively for midbrain compression in neurotrauma. It has no correlation with thoracic or abdominal organ injuries. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Uncal Herniation:** Ipsilateral dilated pupil (CN III compression), contralateral hemiparesis (standard), or ipsilateral hemiparesis (Kernohan’s notch phenomenon), and deteriorating GCS. * **False Localizing Sign:** Kernohan’s notch is the most common cause of a false localizing motor sign in head injury. * **Burr Hole Site:** In emergencies, the first burr hole is typically placed on the side of the **dilated pupil**, not necessarily the side of the hemiparesis.

Q: A 25-year-old female was involved in a car accident. Her Glasgow Coma Scale (GCS) was normal. On examination, her heart rate was 150/min, blood pressure was 90/60 mm Hg, and respiratory rate was 20/min. Her jugular venous pressure (JVP) was raised, her abdomen was not tender, and she had ecchymosis over her anterior chest. Breath sounds were absent on one side. What is the most appropriate diagnosis?

Tension pneumothorax. ### Explanation The patient presents with signs of **obstructive shock** (tachycardia, hypotension, and raised JVP) following blunt chest trauma. The clinical triad of **hypotension, raised JVP, and absent breath sounds** on one side is pathognomonic for **Tension Pneumothorax**. #### Why Tension Pneumothorax is Correct: In a tension pneumothorax, a "one-way valve" mechanism allows air into the pleural space but prevents its escape. This leads to increased intrapleural pressure, causing: 1. **Lung collapse:** Resulting in absent breath sounds. 2. **Mediastinal shift:** Compressing the vena cava and heart, leading to decreased venous return (raised JVP) and decreased cardiac output (hypotension/tachycardia). #### Why Other Options are Incorrect: * **Cardiac Tamponade:** While it presents with Beck’s Triad (hypotension, raised JVP, muffled heart sounds), **breath sounds remain normal and equal** bilaterally. * **Massive Hemothorax:** This presents with hypotension and absent breath sounds; however, due to significant blood loss, the **JVP would be flat (collapsed)**, not raised. * **Pleural Effusion:** This is typically a chronic or subacute finding and does not cause acute obstructive shock in a trauma setting. #### NEET-PG High-Yield Pearls: * **Diagnosis:** Tension pneumothorax is a **clinical diagnosis**. Do NOT wait for a Chest X-ray if the patient is unstable. * **Immediate Management:** Needle decompression (traditionally 2nd intercostal space in the mid-clavicular line; ATLS 10th ed. now prefers the **5th intercostal space** anterior to the mid-axillary line). * **Definitive Management:** Tube thoracostomy (Chest tube). * **Differentiating Feature:** The presence of **hyper-resonance** on percussion further confirms pneumothorax over hemothorax (which is dull to percuss).

Question 1

A 30-year-old patient with a head injury presented to the emergency department. NCCT findings are provided. All of the following are true about this condition except:

Accepted Answer

Full recovery is rare even after treatment

Answer

Lucid interval is positive

Answer

Immediate surgical evacuation should be done

Answer

Arterial bleeding

Question 2

A 50-year-old male presents with severe vomiting and retching accompanied by sharp substernal pain. Four hours later, a chest X-ray reveals air density outlining the left descending aorta. What is the optimum strategy for his care?

Accepted Answer

Immediate thoracotomy

Answer

Serial ECGs and CPKs to rule out myocardial infarction

Answer

Left chest tube and spiroid fistula

Answer

Esophagogastroscopy to establish the diagnosis

Question 3

After an open injury, what is the optimum time for nerve suture?

Accepted Answer

When the wound is free from infection

Answer

Immediately

Answer

Within one month

Answer

1-2 months

Question 4

In burns, when does pus formation typically occur?

Accepted Answer

3-5 days

Answer

2-3 days

Answer

2-3 weeks

Answer

4 weeks

Question 5

Which of the following are causes of secondary brain injury?

Accepted Answer

All of the above

Answer

Pyrexia and hypotension

Answer

Seizures and metabolic disturbance

Answer

Low cerebral perfusion pressure

Question 6

A 50-year-old man with a history of being a Jehovah's Witness, who refuses blood transfusions, is brought to the emergency department after a motor vehicle accident. He presents with signs of shock (hypotension, tachycardia) and abdominal ultrasound reveals free fluid, necessitating an emergency laparotomy. If the patient requires blood during the operation, what is the surgeon's best course of action?

Accepted Answer

Proceed with the surgery without administering blood, even if indicated.

Answer

Seek an ethics consultation.

Answer

Attempt to contact the patient's neighbor for guidance.

Answer

Administer cross-matched blood to the patient.

Question 7

Kernohan's notch is seen in which organ injury?

Accepted Answer

Brain

Answer

Lungs

Answer

Right lobe of the liver

Answer

Left lobe of the liver

Question 8

What is the correct method for examining the spine of a polytrauma patient?

Accepted Answer

Log roll

Answer

Barrel roll

Answer

Chin lift

Answer

None of the above

Question 9

A 40-year-old man sustained injuries to the liver, gallbladder, small intestine, and colon from gunshot wounds. At the time of surgery, a cholecystostomy was placed in the injured gallbladder to expedite operative management. Four weeks later, the patient is doing well. Which is the next step in management?

Accepted Answer

Perform a cholangiogram through the cholecystostomy tube.

Answer

Remove the cholecystostomy tube.

Answer

Perform a cholecystectomy.

Answer

Perform a choledochoduodenostomy.

Question 10

A 25-year-old female was involved in a car accident. Her Glasgow Coma Scale (GCS) was normal. On examination, her heart rate was 150/min, blood pressure was 90/60 mm Hg, and respiratory rate was 20/min. Her jugular venous pressure (JVP) was raised, her abdomen was not tender, and she had ecchymosis over her anterior chest. Breath sounds were absent on one side. What is the most appropriate diagnosis?

Accepted Answer

Tension pneumothorax

Answer

Cardiac tamponade

Answer

Massive hemothorax

Answer

Pleural effusion

Trauma — MCQs

Trauma — MCQs

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