Trauma Practice Questions

Q: Which of the following is used for 'Figure of eight' wiring for stabilization of subluxated teeth in alveolar injuries?

0.35mm stainless steel wire. **Explanation:** In the management of alveolar fractures and dental trauma, stabilization of subluxated or luxated teeth is crucial to allow periodontal ligament healing. The **'Figure of eight' wiring** (also known as Essig’s splinting) is a common technique used for this purpose. **1. Why 0.35mm is the Correct Answer:** The standard wire used for dental splinting and intermaxillary fixation (IMF) in maxillofacial surgery is **0.35 mm (28 gauge)** stainless steel wire. This specific thickness provides the ideal balance between **tensile strength** (to stabilize the tooth against occlusal forces) and **malleability** (allowing the surgeon to twist and adapt the wire around the cervical margins of the teeth without snapping). **2. Analysis of Incorrect Options:** * **0.23 mm (Option A):** This wire is too thin and fragile. It lacks the structural integrity to provide rigid or semi-rigid stabilization and is prone to breakage during the tightening process. * **0.45 mm & 0.55 mm (Options C & D):** These wires are too thick and rigid. They are difficult to contour around the dental anatomy and can exert excessive orthodontic forces on the injured teeth, potentially hindering the healing of the periodontal ligament or causing further trauma. **Clinical Pearls for NEET-PG:** * **Duration of Splinting:** For subluxated teeth or alveolar fractures, the splint is typically kept for **4 weeks**. If the injury involves a root fracture, the duration may extend to **2–4 months**. * **Ideal Splint Characteristics:** A good splint should be passive (not moving the tooth), allow for physiological mobility, and be easy to clean to prevent gingival inflammation. * **Other uses of 0.35mm wire:** It is also the standard wire used for securing **Eyelet (Ivy) wiring** and **Arch bars** in mandibular or maxillary fractures.

Q: A patient presents with a blood pressure of 100/70 mmHg, a pulse rate of 110 beats/min, and respiratory distress indicated by accessory muscle use. What is the most likely diagnosis?

Pneumothorax. **Explanation:** The patient presents with signs of **respiratory distress** (accessory muscle use) and **hemodynamic instability** (tachycardia and borderline hypotension). In the context of trauma, these findings are classic for a **Pneumothorax**, specifically a tension pneumothorax if it progresses. **1. Why Pneumothorax is correct:** Pneumothorax occurs when air enters the pleural space, causing lung collapse. This leads to immediate respiratory distress and hypoxia, triggering compensatory tachycardia (110 bpm). As intrapleural pressure increases (Tension Pneumothorax), it causes a mediastinal shift, compressing the vena cava and decreasing venous return (preload), which leads to hypotension. The hallmark is the combination of respiratory distress with signs of obstructive shock. **2. Why other options are incorrect:** * **Hemothorax:** While it also causes tachycardia and hypotension (hemorrhagic shock), the primary feature is usually dullness on percussion and decreased breath sounds. Respiratory distress is present, but the hemodynamic collapse is due to blood loss rather than air pressure. * **Cardiac Tamponade:** This presents with **Beck’s Triad** (hypotension, muffled heart sounds, and JVD). While it causes tachycardia and hypotension, it typically does *not* present with significant respiratory distress or accessory muscle use unless there is associated lung injury. **Clinical Pearls for NEET-PG:** * **Tension Pneumothorax** is a **clinical diagnosis**. Do NOT wait for an X-ray; immediate needle decompression (4th/5th ICS mid-axillary line in adults) is required. * **Differentiating Tip:** Hyper-resonance on percussion = Pneumothorax; Dullness = Hemothorax. * **Tracheal deviation** is a late sign and occurs away from the side of the tension pneumothorax.

Q: What percentage of burns in a child involves the head region?

20%. **Explanation:** The assessment of burn surface area in children differs significantly from adults due to their unique body proportions. In adults, the **Rule of Nines** (Wallace) is used, where the head and neck account for 9%. However, children have a disproportionately larger head and smaller lower limbs. **1. Why 20% is Correct:** According to the modified Rule of Nines for infants/children, the **head and neck account for 18%** (often rounded to 20% in clinical exams). As a child grows, 1% is subtracted from the head and added to each leg for every year of age over one. By age 10, the child’s proportions approximate those of an adult. **2. Analysis of Incorrect Options:** * **A (10%):** This is closer to the adult value (9%). Selecting this would underestimate the fluid resuscitation requirements in a pediatric patient. * **C & D (30% & 40%):** These values are excessively high. Even in a neonate, the head does not exceed 18-20% of the total body surface area (TBSA). **3. Clinical Pearls for NEET-PG:** * **Lund and Browder Chart:** This is the **most accurate** method for calculating TBSA in children as it accounts for age-specific changes in body surface area. * **Palmar Method:** The patient’s palm (including fingers) represents approximately **1% TBSA**. This is useful for small or patchy burns. * **Fluid Resuscitation:** Children require more maintenance fluid than adults. The **Parkland Formula** (4ml/kg/% burn) is used, but in children, maintenance fluids (using the Holliday-Segar formula) must be added to the resuscitation volume to prevent hypoglycemia and dehydration. * **Critical Area:** In children, the head is a major source of heat loss; hence, keeping the head covered during burn management is vital to prevent hypothermia.

Q: An 81-year-old female falls and presents to the emergency department. What injury to a tissue or structure causes lower leg extremities to be externally rotated?

Lateral meniscus. **Explanation:** The correct answer is **Lateral meniscus**. This question focuses on the **"Screw-home mechanism"** of the knee joint. In the final stages of knee extension (the last 30 degrees), the femur undergoes internal rotation relative to the tibia to "lock" the knee. Conversely, to initiate flexion, the knee must "unlock." If there is a tear or displacement of the **lateral meniscus**, it can act as a mechanical wedge, preventing normal tracking and causing the tibia to remain in a position of **external rotation** (or the femur in internal rotation) to accommodate the displaced tissue. **Analysis of Options:** * **A. Sacroiliac joint:** Injuries here typically present with pelvic instability and pain but do not result in a characteristic external rotation of the lower leg. * **B. Neck of femur & D. Intertrochanteric fracture:** While these fractures classically present with external rotation and shortening of the limb, the rotation occurs at the **hip joint**, involving the entire lower extremity. The question specifically points toward a structure causing rotation of the **lower leg extremities** (distal to the knee), which is a classic sign of a "locked knee" due to meniscal pathology. **Clinical Pearls for NEET-PG:** * **Screw-home mechanism:** Medial rotation of the femur on the tibia during the terminal phase of extension. * **Unlocking the knee:** Performed by the **Popliteus muscle** (the "key" to the knee), which laterally rotates the femur on the tibia. * **Bucket-handle tears:** Most common cause of a "locked knee" where the patient cannot fully extend the leg, often held in slight external rotation.

Q: Which statement about diaphragmatic injury is true?

Left-sided injury is more common. **Explanation:** Diaphragmatic injuries typically result from blunt or penetrating trauma. **Option C is correct** because left-sided diaphragmatic ruptures are significantly more common (approx. 70-80% of cases). This is due to two primary factors: 1. **The Protective Effect of the Liver:** On the right side, the liver acts as a buffer, absorbing and distributing the kinetic energy of the impact. 2. **Congenital Weakness:** The left hemidiaphragm has a natural point of weakness at the posterolateral aspect (the site of embryonic fusion). **Analysis of Incorrect Options:** * **Options A & B:** Diaphragmatic injuries **never** resolve spontaneously and cannot be treated conservatively. Due to the pressure gradient between the positive-pressure abdomen and negative-pressure thorax, abdominal viscera will eventually herniate into the chest. Therefore, surgical repair (laparotomy or thoracotomy) is mandatory once diagnosed. * **Option D:** While a pneumothorax *can* coexist with trauma, diaphragmatic injury is classically associated with **hemothorax** or the presence of **bowel sounds/hollow viscera** in the thoracic cavity, rather than being defined by pneumothorax itself. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Diagnostic Laparoscopy (especially for small penetrating wounds). * **Chest X-ray Finding:** Look for the "Gurgle sign" (bowel loops in the chest) or a nasogastric tube coiled in the thorax. * **Surgical Approach:** In acute cases, **Laparotomy** is preferred to inspect for associated intra-abdominal organ injuries. In chronic/delayed presentations, a **Thoracotomy** is often preferred due to adhesions.

Q: A 27-year-old patient presented with left-sided abdominal pain to the emergency room, 6 hours after trauma. The patient is hemodynamically stable and FAST positive. A contrast-enhanced CT scan shows a contrast blush along with a Grade I laceration. What is the most appropriate management?

Splenic Artery Embolization. ### **Explanation** The management of splenic trauma is primarily dictated by the patient's **hemodynamic stability** rather than the grade of injury alone. **1. Why Splenic Artery Embolization (SAE) is Correct:** The patient is **hemodynamically stable**, which is the prerequisite for Non-Operative Management (NOM). However, the presence of a **"contrast blush"** on CECT indicates active extravasation of contrast (active bleeding) or a pseudoaneurysm. In a stable patient, a contrast blush is a specific indication for **Angiography and Embolization**. SAE increases the success rate of NOM by stopping the focal bleed while preserving splenic immune function. **2. Why the other options are incorrect:** * **Splenectomy (A) & Splenorrhaphy (B):** These are operative interventions. Surgery is indicated only if the patient is hemodynamically **unstable**, has peritonitis, or if NOM/Embolization fails. * **Conservative Management (D):** While Grade I injuries are often managed conservatively (observation), the presence of a **contrast blush** is a "red flag" that significantly increases the risk of delayed rupture and failure of simple observation. Therefore, active intervention via embolization is required. --- ### **High-Yield Clinical Pearls for NEET-PG** * **Gold Standard Investigation:** CECT (only for stable patients). * **Most Common Organ Injured:** Spleen (in Blunt Abdominal Trauma). * **Indications for SAE:** Hemodynamically stable patient with CECT showing contrast blush, pseudoaneurysm, or high-grade injury (Grade IV/V). * **Kehr’s Sign:** Referred pain to the left shoulder due to diaphragmatic irritation (classic for splenic rupture). * **Post-Splenectomy Prophylaxis:** Vaccination against encapsulated organisms (*H. influenzae, B. meningitidis, S. pneumoniae*) should be given 14 days after emergency surgery or 14 days before elective surgery.

Q: What diameter of cerebellar hematoma requires surgical evacuation?

Greater than 3 cm. **Explanation:** The management of cerebellar hematomas is a critical topic in neurotrauma because the posterior fossa is a confined space. Unlike supratentorial bleeds, even small increases in volume here can rapidly lead to brainstem compression, obstructive hydrocephalus, or tonsillar herniation. **Why Option D is Correct:** According to the **Guidelines for the Management of Spontaneous Intracerebral Hemorrhage**, surgical evacuation is indicated for patients with a cerebellar hemorrhage greater than **3 cm in diameter** who are experiencing neurological deterioration or who have brainstem compression and/or hydrocephalus. A 3 cm threshold is the established clinical "cutoff" where the risk of fatal brainstem herniation outweighs the risks of suboccipital craniectomy. **Why Other Options are Incorrect:** * **Options A & B (0.5 cm and 1 cm):** These are considered small hematomas. They are typically managed conservatively with close neurological monitoring and serial CT scans, as they rarely cause significant mass effect. * **Option C (2 cm):** While a 2 cm bleed requires vigilant observation, it does not meet the standard surgical criteria unless accompanied by significant clinical deterioration or acute hydrocephalus. **High-Yield Clinical Pearls for NEET-PG:** 1. **The "Rule of 3":** For cerebellar hematomas, think of **3 cm** as the magic number for surgery. 2. **Clinical Presentation:** Look for the triad of ataxia, headache, and vomiting. 3. **GCS vs. Size:** Even if a patient has a high GCS, a hematoma >3 cm is often treated surgically because "talk and die" syndrome is common due to sudden brainstem compression. 4. **Associated Findings:** Always check for **obstructive hydrocephalus** (due to 4th ventricle compression), which may require an EVD (External Ventricular Drain) in addition to or before evacuation.

Question 1

Which of the following is used for 'Figure of eight' wiring for stabilization of subluxated teeth in alveolar injuries?

Accepted Answer

0.35mm stainless steel wire

Answer

0.23mm stainless steel wire

Answer

0.45mm stainless steel wire

Answer

0.55mm stainless steel wire

Question 2

A patient presents with a blood pressure of 100/70 mmHg, a pulse rate of 110 beats/min, and respiratory distress indicated by accessory muscle use. What is the most likely diagnosis?

Accepted Answer

Pneumothorax

Answer

Hemothorax

Answer

Cardiac tamponade

Answer

None of the above

Question 3

What is the recommended temperature for rapid rewarming in frostbite treatment?

Accepted Answer

42°C

Answer

37°C

Answer

45°C

Answer

30°C

Question 4

All of the following are true about rib fractures except:

Accepted Answer

Intermittent positive pressure ventilation is the preferred treatment for flail chest.

Answer

The most common rib fractured during CPR is the 4th-6th rib.

Answer

Fracture of the 11th, 12th, and first rib is uncommon.

Answer

In flail chest, two or more consecutive ribs are fractured in two or more places.

Question 5

What percentage of burns in a child involves the head region?

Accepted Answer

20%

Answer

10%

Answer

30%

Answer

40%

Question 6

An 81-year-old female falls and presents to the emergency department. What injury to a tissue or structure causes lower leg extremities to be externally rotated?

Accepted Answer

Lateral meniscus

Answer

Sacroiliac joint

Answer

Neck of femur

Answer

Intertrochanteric fracture

Question 7

Which statement about diaphragmatic injury is true?

Accepted Answer

Left-sided injury is more common

Answer

Treatment is conservative

Answer

It resolves spontaneously

Answer

It is associated with pneumothorax

Question 8

A 27-year-old patient presented with left-sided abdominal pain to the emergency room, 6 hours after trauma. The patient is hemodynamically stable and FAST positive. A contrast-enhanced CT scan shows a contrast blush along with a Grade I laceration. What is the most appropriate management?

Accepted Answer

Splenic Artery Embolization

Answer

Splenectomy

Answer

Splenorrhaphy

Answer

Conservative management

Question 9

Which criteria indicate that a burn patient should be referred for specialized care?

Accepted Answer

25% deep burn in an adult

Answer

10% superficial burn in a child

Answer

Scald burn on the face

Answer

25% superficial burn in an adult

Question 10

What diameter of cerebellar hematoma requires surgical evacuation?

Accepted Answer

Greater than 3 cm

Answer

Greater than 0.5 cm

Answer

Greater than 1 cm

Answer

Greater than 2 cm

Trauma — MCQs

Trauma — MCQs

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