Trauma Practice Questions

Q: Subdural hematoma most commonly results from?

Injury to cortical bridging veins. **Explanation:** **Subdural Hematoma (SDH)** occurs due to the accumulation of blood in the potential space between the dura mater and the arachnoid mater. 1. **Why Option C is Correct:** The primary mechanism of SDH is the **tearing of cortical bridging veins** as they traverse the subdural space to drain into the dural venous sinuses (e.g., Superior Sagittal Sinus). These veins are particularly vulnerable to **shearing forces** during sudden acceleration-deceleration injuries. In elderly patients or those with chronic alcoholism, cerebral atrophy stretches these veins, making them susceptible to rupture even with minor trauma. 2. **Why Other Options are Incorrect:** * **Option A & B:** Rupture of an intracranial aneurysm or arteriovenous malformation (AVM) typically results in a **Subarachnoid Hemorrhage (SAH)**, characterized by blood in the CSF-filled space between the arachnoid and pia mater ("thunderclap headache"). * **Option D:** While hemophilia is a bleeding diathesis that can predispose a patient to intracranial bleeds, it is a systemic risk factor rather than the direct anatomical cause of the hematoma. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** On CT, SDH appears as a **Crescent-shaped (concave)** hyperdensity that **can cross suture lines** (unlike Epidural Hematoma). * **Chronic SDH:** Common in elderly; presents with fluctuating levels of consciousness and progressive dementia-like symptoms weeks after minor trauma. * **Epidural Hematoma (EDH):** Usually due to injury to the **Middle Meningeal Artery**; characterized by a "Lucid Interval" and a biconvex (lens-shaped) appearance on CT. * **Management:** Surgical evacuation (Burr hole or Craniotomy) is indicated if there is a significant midline shift (>5mm) or neurological deterioration.

Q: Fracture at the angle of the mandible most commonly involves which tooth?

Third molars. **Explanation:** The **third molar (wisdom tooth)** is the correct answer due to the structural anatomy of the mandible. The angle of the mandible is a transition zone between the horizontal body and the vertical ramus. This area is inherently weakened by the presence of the third molar socket, especially if the tooth is **impacted**. An impacted third molar reduces the cross-sectional area of bone at the angle, creating a point of least resistance. Biomechanically, when a force is applied to the mandible, stress concentrates at this site, making it the most common location for fractures in the posterior mandible. **Analysis of Incorrect Options:** * **Second Premolar (A):** Fractures in this region are typically associated with the **mental foramen**, which is a weak point in the body of the mandible, but it is not the most common site compared to the angle. * **First Molar (B):** While the body of the mandible is a common site for fractures, the first molar region is structurally thicker and more robust than the angle containing a third molar. * **Incisors (C):** Fractures in the midline (symphysis) or parasymphysis are common in "guardsman fractures" (falls on the chin), but they do not occur at the angle. **Clinical Pearls for NEET-PG:** * **Most common site of Mandibular Fracture:** Condyle (overall), followed by the Angle and Symphysis. * **Weakest points of the Mandible:** Condylar neck, Angle (due to 3rd molars), and Mental foramen. * **Nerve Injury:** Angle fractures frequently involve the **Inferior Alveolar Nerve**, leading to paresthesia of the lower lip. * **Muscle Pull:** The displacement of angle fractures is determined by the pull of the masseter, medial pterygoid, and temporal muscles (classified as "favorable" or "unfavorable" fractures).

Q: A 35-year-old chemical factory worker presents to the emergency department after a sudden splash of an unknown chemical onto his hands and feet. Which of the following statements is true regarding the management of chemical burns, except?

Attempts should be made to neutralize the chemical.. **Explanation:** The management of chemical burns focuses on immediate decontamination and preventing further tissue damage. **Why Option C is the correct (False) statement:** Neutralization of a chemical (e.g., adding an acid to an alkali) is **strictly contraindicated**. The chemical reaction of neutralization is exothermic, meaning it releases significant heat. This can cause additional thermal injury to already damaged tissues, potentially worsening the depth of the burn. **Analysis of other options:** * **Option A:** Copious irrigation with water or saline is the cornerstone of management. It dilutes the chemical and washes it away. Irrigation should continue for at least 30–60 minutes (longer for alkalis). * **Option B:** Alkali burns are more dangerous because they cause **liquefactive necrosis**, which allows the chemical to penetrate deeper into the tissues. Acid burns cause **coagulative necrosis**, forming a leathery eschar that acts as a barrier to further penetration. * **Option D:** Hydrofluoric acid (HF) is unique; it causes deep tissue destruction and life-threatening hypocalcemia. Topical **calcium gluconate gel** (or intra-arterial injection) is the specific antidote used to neutralize the fluoride ion. **NEET-PG High-Yield Pearls:** 1. **Initial Step:** Remove all contaminated clothing and brush off dry powders (like lime) before irrigation. 2. **Alkali vs. Acid:** Alkali = Liquefactive necrosis (Deep); Acid = Coagulative necrosis (Superficial). 3. **Specific Antidotes:** * **Hydrofluoric Acid:** Calcium gluconate. * **White Phosphorus:** 1% Copper sulfate (turns particles black for easy removal). * **Phenol:** Polyethylene glycol (PEG) or glycerol.

Q: What is the initial management for a patient with 40% blood volume loss?

Crystalloid infusion. **Explanation:** The patient is in **Class III/IV Hemorrhagic Shock** (40% blood loss corresponds to Class IV, where blood loss is >2000 mL). The primary pathophysiology in trauma-induced hemorrhagic shock is a critical reduction in circulating volume (hypovolemia), leading to decreased preload and tissue hypoperfusion. **1. Why Crystalloid Infusion is Correct:** The cornerstone of initial resuscitation (ATLS guidelines) is the restoration of intravascular volume. **Isotonic crystalloids** (like Ringer’s Lactate or Normal Saline) are the first-line fluids used to stabilize hemodynamics and maintain organ perfusion. While Class IV shock eventually requires blood transfusion (MTP), the *initial* immediate management in any trauma setting is establishing IV access and starting crystalloid boluses. **2. Why Incorrect Options are Wrong:** * **A & B (Vasopressors/Cardiac Stimulants):** These are contraindicated as initial therapy. Vasopressors cause vasoconstriction in an already depleted vascular bed, worsening tissue ischemia. The heart is usually already tachycardic to compensate; stimulants increase myocardial oxygen demand without fixing the underlying volume deficit. * **D (Intracardiac Adrenaline):** This is an obsolete practice reserved only for specific cardiac arrest scenarios, not for the management of hypovolemic shock. **High-Yield Clinical Pearls for NEET-PG:** * **ATLS Classification:** Class I ( 40%). * **Fluid of Choice:** Ringer’s Lactate is preferred over Normal Saline to avoid hyperchloremic metabolic acidosis. * **The "Golden Hour":** Rapid volume replacement within the first hour significantly improves survival. * **Permissive Hypotension:** In non-compressible torso hemorrhage, target a lower MAP (approx. 65 mmHg) until bleeding is surgically controlled to prevent "popping the clot."

Q: The above procedure is contraindicated in which of the following conditions?

Lung abscess. ***Lung abscess*** - **Intercostal chest drain (ICD)** insertion is contraindicated as it risks **pleural contamination** and development of **empyema** by creating a direct communication between the infected lung parenchyma and pleural space. - The procedure could lead to **spillage of purulent material** into the pleural cavity, converting a localized parenchymal infection into a more serious pleural space infection. *Pleural effusion* - **ICD insertion** is a **standard treatment** for large or symptomatic pleural effusions to drain accumulated fluid and improve respiratory function. - The procedure is safe and effective for removing **transudate** or **exudate** from the pleural space without risk of contamination. *Hemothorax* - **ICD insertion** is **indicated** for hemothorax to drain accumulated blood from the pleural space and prevent **fibrothorax** formation. - Early drainage helps assess ongoing bleeding and facilitates **lung re-expansion**, making it a therapeutic rather than contraindicated procedure. *Hydropneumothorax* - **ICD insertion** is the **treatment of choice** for hydropneumothorax to simultaneously drain both air and fluid from the pleural space. - The procedure effectively manages both components of the condition, allowing **lung re-expansion** and resolution of respiratory compromise.

Q: A young male presented with dyspnea, bleeding, and petechial hemorrhage in the chest 2 days following a fracture of the shaft of the right femur. What is the most likely cause?

Fat embolism. **Explanation:** The clinical presentation of a long-bone fracture (femur shaft) followed by a **latent period of 24–72 hours**, respiratory distress (dyspnea), and a **petechial rash** (typically over the chest, axilla, and conjunctiva) is the classic triad of **Fat Embolism Syndrome (FES)**. **Why Fat Embolism is correct:** Following a major fracture, fat globules from the bone marrow enter the systemic circulation. These globules cause mechanical obstruction of pulmonary capillaries and trigger a chemical inflammatory response (via free fatty acids), leading to lung injury and the characteristic petechial rash due to capillary rupture or thrombocytopenia. **Why other options are incorrect:** * **Air Embolism:** Usually occurs acutely following venous catheterization, neck injuries, or surgery. It does not typically present with a petechial rash or a 2-day delay. * **Pulmonary Thrombo-embolism (PTE):** While common in trauma patients due to immobility, PTE usually occurs **5–10 days** post-injury. It lacks the characteristic petechial rash. * **Amniotic Fluid Embolism:** This is an obstetric emergency occurring during labor or immediate postpartum; it is irrelevant to a male patient with a femur fracture. **High-Yield Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis. Major criteria include axillary/subconjunctival petechiae, respiratory insufficiency, and CNS depression. * **Snowstorm Appearance:** Classic finding on Chest X-ray (diffuse bilateral pulmonary infiltrates). * **Early Fixation:** The most effective way to prevent FES is the early stabilization/fixation of the fracture. * **Treatment:** Primarily supportive (Oxygenation/Ventilation). Steroids are controversial and not routinely recommended.

Question 1

Subdural hematoma most commonly results from?

Accepted Answer

Injury to cortical bridging veins

Answer

Rupture of intracranial aneurysm

Answer

Rupture of cerebral arteriovenous malformation

Answer

Hemophilia

Question 2

When is emergency endotracheal intubation indicated?

Accepted Answer

Glasgow Coma Scale (GCS) less than 7

Answer

Tension pneumothorax

Answer

Cardiac tamponade

Answer

Bleeding gastric ulcer

Question 3

Fracture at the angle of the mandible most commonly involves which tooth?

Accepted Answer

Third molars

Answer

Second premolar

Answer

First molar

Answer

Incisor

Question 4

Which of the following does NOT require hospitalization?

Accepted Answer

5% burns in children

Answer

10% scalds in children

Answer

Electrocution

Answer

15% deep burns in adults

Question 5

A 35-year-old chemical factory worker presents to the emergency department after a sudden splash of an unknown chemical onto his hands and feet. Which of the following statements is true regarding the management of chemical burns, except?

Accepted Answer

Attempts should be made to neutralize the chemical.

Answer

Copious irrigation with water should be performed.

Answer

Alkali burns are generally more destructive and dangerous than acid burns.

Answer

Topical calcium gluconate is used in the treatment of hydrofluoric acid burns.

Question 6

What is the initial management for a patient with 40% blood volume loss?

Accepted Answer

Crystalloid infusion

Answer

Vasopressor agents

Answer

Cardiac stimulants

Answer

Intracardiac adrenaline

Question 7

The above procedure is contraindicated in which of the following conditions?

Accepted Answer

Lung abscess

Answer

Pleural effusion

Answer

Hemothorax

Answer

Hydropneumothorax

Question 8

Massive blood transfusion is defined as:

Accepted Answer

Replacement of the entire blood volume within a 24-hour period

Answer

Replacement of half the blood volume within a 24-hour period

Answer

Replacement of 40% of the blood volume within a 24-hour period

Answer

Replacement of 60% of the blood volume within a 24-hour period

Question 9

If a fracture of the mandible occurs distal to a lost tooth, what is the treatment of choice?

Accepted Answer

Open reduction with bone plating

Answer

Closed reduction with intermaxillary fixation (IMF)

Answer

Open reduction with interosseous wiring

Answer

Closed reduction with cap splint

Question 10

A young male presented with dyspnea, bleeding, and petechial hemorrhage in the chest 2 days following a fracture of the shaft of the right femur. What is the most likely cause?

Accepted Answer

Fat embolism

Answer

Air embolism

Answer

Pulmonary thrombo-embolism

Answer

Amniotic fluid embolism

Trauma — MCQs

Trauma — MCQs

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