Trauma Practice Questions

Q: What does the return of the bulbocavernous reflex signify in the context of spinal shock?

A sign of recovery from spinal shock. ### Explanation **Concept Overview:** Spinal shock is a state of transient physiological reflex depression following an acute spinal cord injury. It is characterized by the loss of all sensorimotor functions and autonomic reflexes below the level of the lesion. The **Bulbocavernous Reflex (BCR)**—elicited by squeezing the glans penis or tugging on a Foley catheter while palpating the anal sphincter for contraction—is one of the first spinal reflexes to return as spinal shock resolves. **Why Option A is Correct:** The return of the BCR marks the **end of spinal shock**. It signifies that the spinal cord segments below the level of injury have regained their reflex arc activity, even if they remain disconnected from the brain. Until the BCR returns, a clinician cannot accurately determine the true extent of the neurological deficit (complete vs. incomplete). **Why Other Options are Incorrect:** * **Options B, C, and D:** The return of the BCR does **not** indicate the severity or type of the lesion (partial, complete, or incomplete). It only confirms that the "shock" phase is over. Once the BCR is present, any remaining sensory or motor deficit is then considered permanent or representative of the actual cord injury. For example, if the BCR has returned but there is still no motor or sensory function, the injury is classified as a **complete** spinal cord injury. **NEET-PG High-Yield Pearls:** * **First reflex to return:** Bulbocavernous reflex (usually within 24–48 hours). * **First sign of recovery from spinal shock:** Return of the BCR. * **Definition of Spinal Shock:** Total loss of reflexes, motor, and sensory function (flaccid paralysis). * **Neurogenic Shock vs. Spinal Shock:** Do not confuse the two. Neurogenic shock is a **hemodynamic** phenomenon (hypotension + bradycardia) due to loss of sympathetic tone, whereas spinal shock is a **neurological** phenomenon (loss of reflexes).

Q: An ulcer that may develop in burn tissue is called?

Marjolin's ulcer. **Explanation:** **Marjolin’s Ulcer (Correct Answer):** A Marjolin’s ulcer is a **Squamous Cell Carcinoma (SCC)** that arises in areas of chronic inflammation, long-standing scars, or non-healing wounds. It is most classically associated with **old burn scars** (cicatrix). The underlying mechanism involves chronic irritation and poor lymphatic drainage in the scar tissue, leading to malignant transformation. These ulcers are typically aggressive, have everted edges, and carry a higher risk of metastasis compared to SCC arising in healthy skin. **Analysis of Incorrect Options:** * **Rodent Ulcer:** This is a clinical term for **Basal Cell Carcinoma (BCC)**. It typically occurs on sun-exposed areas (above the line joining the tragus to the angle of the mouth) and is characterized by a pearly rolled-out border and slow local invasion. It is not specifically associated with burn scars. * **Melanoma:** This is a malignancy of melanocytes. While it can occur anywhere on the skin, it is not a characteristic complication of chronic burn scars. * **Curling’s Ulcer:** This is an **acute gastric erosion/ulcer** resulting from severe burns (hypovolemia leads to reduced mucosal blood flow). While it is associated with burns, it occurs in the **gastrointestinal tract**, not the burn tissue itself. **High-Yield Clinical Pearls for NEET-PG:** * **Latency Period:** Marjolin’s ulcer usually develops 20–30 years after the initial burn injury. * **Biopsy:** Any ulcer developing in a chronic scar that shows new growth, bleeding, or induration must undergo biopsy to rule out malignancy. * **Treatment:** Wide local excision (usually with 2 cm margins) is the treatment of choice; lymph node dissection is indicated if nodes are palpable. * **Prognosis:** Marjolin’s ulcers are more aggressive than standard SCC because the scar tissue lacks protective lymphatics, allowing for late but rapid spread once the basement membrane is breached.

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.

Question 1

The cold water treatment of burns has the disadvantage that it increases the chances of which of the following?

Accepted Answer

Infection

Answer

Pain

Answer

Exudation

Answer

None of the above

Question 2

A patient with an unfavorable fracture of the angle of the mandible is best treated by:

Accepted Answer

Open reduction with bone plate fixation

Answer

Closed reduction with intermaxillary fixation (IMF)

Answer

Closed reduction with cap splint

Answer

Circum mandibular wiring

Question 3

All of the following are ominous signs in a case of severe head injury, EXCEPT:

Accepted Answer

Development of diabetes insipidus

Answer

Anisocoria

Answer

Decoicate posturing

Answer

Decerebrate posturing

Question 4

What does the return of the bulbocavernous reflex signify in the context of spinal shock?

Accepted Answer

A sign of recovery from spinal shock

Answer

A partial lesion of the spinal cord

Answer

A complete transection of the spinal cord

Answer

An incomplete transection of the spinal cord

Question 5

An ulcer that may develop in burn tissue is called?

Accepted Answer

Marjolin's ulcer

Answer

Rodent ulcer

Answer

Melanoma

Answer

Curling's ulcer

Question 6

In a head injury patient, mannitol should not be used for control of increased intracranial pressure when?

Accepted Answer

Serum osmolality is greater than 320 mOsmol/kg

Answer

Arterial PaCO2 is greater than 35 mm Hg

Answer

Arterial PaCO2 is greater than 100 mm Hg

Answer

Arterial pH is 7.4

Question 7

Which of the following is an indication for emergency thoracotomy?

Accepted Answer

Greater than 200 ml of blood drained by chest tube over 3 consecutive hours

Answer

Output of greater than 1 L at the time of intercostal chest tube insertion

Answer

Penetrating chest trauma

Answer

All of the above

Question 8

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 9

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 10

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

Accepted Answer

42°C

Answer

37°C

Answer

45°C

Answer

30°C

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