Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 671: A patient with a history of fall presents weeks later with headache and progressive neurological deterioration. What is the most likely diagnosis?

A. Acute subdural hemorrhage
B. Extradural hemorrhage
C. Chronic subdural hemorrhage (Correct Answer)
D. Fracture skull

Explanation: **Explanation:** The correct diagnosis is **Chronic Subdural Hemorrhage (cSDH)**. The hallmark of this condition is a **latent period** (weeks to months) between a relatively trivial head injury (like a fall) and the onset of symptoms. **1. Why Chronic Subdural Hemorrhage is correct:** In cSDH, the mechanism involves the tearing of **bridging veins** that drain from the cerebral cortex to the dural sinuses. In elderly patients or those with brain atrophy, these veins are stretched and more prone to rupture. The bleeding is slow and venous; over weeks, the clot liquefies and expands due to recurrent micro-bleeding from the outer membrane or osmotic shifts, leading to progressive headache, confusion, and neurological deterioration. **2. Why other options are incorrect:** * **Acute Subdural Hemorrhage:** Presents immediately (within 72 hours) after high-impact trauma, often associated with underlying brain parenchymal injury and rapid deterioration. * **Extradural Hemorrhage (EDH):** Typically follows arterial injury (Middle Meningeal Artery) and presents acutely with a "Lucid Interval" followed by rapid collapse within hours, not weeks. * **Fracture Skull:** While a fracture may coexist with trauma, it is a bony injury and does not inherently explain progressive neurological deterioration weeks later without an associated intracranial bleed. **Clinical Pearls for NEET-PG:** * **Imaging:** On CT, cSDH appears as a **crescent-shaped, hypodense (dark)** collection. (Acute is hyperdense/white). * **Risk Factors:** Elderly, chronic alcoholics, and patients on anticoagulants (due to brain atrophy and increased venous fragility). * **Management:** Symptomatic cSDH is typically treated via **Burr hole evacuation**. * **Key Distinction:** EDH is biconvex/lens-shaped; SDH is crescent-shaped.

Question 672: All of the following statements about an inhaled tooth fragment are true EXCEPT?

A. It usually enters the right bronchus.
B. It may cause a lung abscess.
C. It may cause bronchiectasis.
D. It will be coughed out spontaneously and no treatment is necessary. (Correct Answer)

Explanation: ### Explanation The correct answer is **D**. Inhaled foreign bodies, such as tooth fragments, are rarely coughed out spontaneously due to the anatomy of the tracheobronchial tree and the inflammatory response they trigger. Once a foreign body passes the vocal cords, it typically becomes lodged, requiring **Rigid Bronchoscopy** for removal. Leaving it untreated leads to chronic complications. **Analysis of Options:** * **Option A (Right Bronchus):** This is a true statement. Inhaled objects more commonly enter the **right main bronchus** because it is wider, shorter, and more vertical (aligned with the trachea) compared to the left. * **Option B (Lung Abscess):** This is a true statement. A retained tooth fragment causes bronchial obstruction and introduces oral flora (anaerobes), leading to post-obstructive pneumonia and subsequent **lung abscess** formation. * **Option C (Bronchiectasis):** This is a true statement. Long-standing foreign body obstruction leads to chronic inflammation and irreversible destruction of the bronchial walls, resulting in **localized bronchiectasis**. **Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** Rigid bronchoscopy is the procedure of choice for foreign body removal in both children and adults. * **Radiology:** Most inhaled teeth are radio-opaque; however, if the object is radiolucent, look for indirect signs like obstructive emphysema (hyperlucency) or atelectasis. * **Common Site:** In the supine position, aspirated material most commonly enters the **superior segment of the right lower lobe**. * **Triad:** The classic clinical triad of foreign body aspiration includes paroxysmal coughing, wheezing, and diminished breath sounds.

Question 673: A 60-year-old man involved in a car crash sustained multiple rib fractures over his right chest. He was not wearing a seat belt and the vehicle did not have an airbag. His pulse becomes weaker during inspiration. What is the most likely diagnosis?

A. Flail chest (Correct Answer)
B. Empyema
C. Diaphragm rupture
D. Cervical rib

Explanation: ### **Explanation** **Correct Answer: A. Flail Chest** The clinical scenario describes a high-impact blunt trauma (car crash without seatbelt/airbags) resulting in multiple rib fractures. The key clinical finding mentioned is a **pulse that becomes weaker during inspiration**, known as **Pulsus Paradoxus**. In **Flail Chest**, the paradoxical movement of the chest wall (inward during inspiration, outward during expiration) causes significant changes in intrathoracic pressure. During inspiration, the flail segment moves inward, increasing intrathoracic pressure and shifting the mediastinum. This leads to decreased venous return to the right heart and compromised left ventricular filling, manifesting as Pulsus Paradoxus. Flail chest is defined as the fracture of $\geq 3$ contiguous ribs in $\geq 2$ places. **Analysis of Incorrect Options:** * **B. Empyema:** This is a collection of pus in the pleural space, usually a late complication of pneumonia or untreated hemothorax. It presents with fever and productive cough, not acute post-traumatic hemodynamic changes. * **C. Diaphragm Rupture:** While common in blunt trauma, it typically presents with respiratory distress and bowel sounds in the chest. It does not typically cause Pulsus Paradoxus unless associated with massive herniation causing a tension effect. * **D. Cervical Rib:** This is a congenital anatomical variant (extra rib at C7) that may cause Thoracic Outlet Syndrome. It is not related to acute trauma or rib fractures. --- ### **High-Yield Pearls for NEET-PG:** * **Definition:** $\geq 3$ ribs fractured in $\geq 2$ places. * **Pathophysiology:** The primary cause of hypoxia in flail chest is the underlying **Pulmonary Contusion**, not the paradoxical breathing itself. * **Management:** The mainstay of treatment is **adequate analgesia** (e.g., epidural) and aggressive pulmonary toilet. Internal fixation (surgery) is indicated if the patient cannot be weaned from a ventilator or has severe chest wall deformity. * **Pulsus Paradoxus:** Defined as a drop in systolic BP $>10$ mmHg during inspiration. Common in Cardiac Tamponade, Tension Pneumothorax, Severe Asthma, and Flail Chest.

Question 674: A patient presents with a penetrating knife injury to the abdomen following an assault. X-ray reveals gas under the diaphragm. Which is the most common organ damaged in this scenario?

A. Spleen
B. Intestine (Correct Answer)
C. Liver
D. Lung

Explanation: **Explanation:** The correct answer is **Intestine (Small Bowel)**. In the context of **penetrating abdominal trauma** (stab wounds or knife injuries), the **small intestine** is the most frequently injured organ. This is due to its large surface area and the fact that it occupies most of the abdominal cavity. The clinical finding of **gas under the diaphragm (pneumoperitoneum)** on an X-ray is a pathognomonic sign of a hollow viscus perforation, further pointing toward the bowel as the site of injury. **Analysis of Options:** * **B. Intestine (Correct):** The small bowel is the #1 most common organ injured in stab wounds, followed by the liver. * **A. Spleen:** While the spleen is the most common organ injured in **blunt** abdominal trauma (e.g., RTA), it is less commonly involved in penetrating injuries compared to the liver and intestines. * **C. Liver:** The liver is the second most common organ injured in stab wounds, but it is a solid organ; an isolated liver injury would typically cause hemoperitoneum rather than pneumoperitoneum. * **D. Lung:** While a high abdominal stab wound can pierce the diaphragm and injure the lung, it is not the most common organ damaged in an abdominal assault. **NEET-PG High-Yield Pearls:** * **Most common organ injured in Blunt Trauma:** Spleen (followed by Liver). * **Most common organ injured in Penetrating Trauma (Stab/Knife):** Small Intestine (followed by Liver). * **Most common organ injured in Gunshot Wounds:** Small Intestine (followed by Colon). * **Pneumoperitoneum:** In trauma, this is an absolute indication for immediate **Exploratory Laparotomy**.

Question 675: All except one are formulas used to calculate fluid replacement in burn patients?

A. Brooke formula
B. Evan's formula
C. Parkland regime
D. Holiday segar formula (Correct Answer)

Explanation: The correct answer is **D. Holiday Segar formula**. ### **Explanation** Fluid resuscitation is critical in the management of major burns to prevent hypovolemic shock. The formulas used for this purpose are based on the patient's weight and the Total Body Surface Area (TBSA) affected. 1. **Why Holiday Segar is the correct answer:** The **Holliday-Segar formula** (the 100/50/20 rule) is used to calculate **maintenance fluid requirements** in pediatric and adult patients based on body weight. It is not specific to burn resuscitation and does not account for the massive fluid shifts (third-spacing) seen in thermal injuries. 2. **Analysis of Incorrect Options:** * **Parkland Regime:** The most commonly used formula. It calculates fluid for the first 24 hours as **4 mL × Weight (kg) × % TBSA**. Half is given in the first 8 hours, and the remainder over the next 16 hours. * **Brooke Formula:** An older crystalloid-based formula. The Modified Brooke formula uses **2 mL × Weight (kg) × % TBSA** of Ringer’s Lactate. * **Evan’s Formula:** A formula that incorporates both crystalloids (Normal Saline) and colloids (Blood/Plasma) along with glucose for maintenance. ### **High-Yield Clinical Pearls for NEET-PG** * **Fluid of Choice:** **Ringer’s Lactate (RL)** is the preferred crystalloid in the first 24 hours to avoid hyperchloremic metabolic acidosis. * **Monitoring Gold Standard:** The adequacy of fluid resuscitation is best monitored by **Hourly Urine Output**. * *Adults:* 0.5 mL/kg/hr (approx. 30–50 mL/hr). * *Children (<30kg):* 1 mL/kg/hr. * **Rule of Nines:** Used to quickly estimate TBSA in adults; for children, the **Lund and Browder chart** is more accurate. * **Fluid Creep:** Over-resuscitation beyond formula requirements can lead to complications like pulmonary edema and compartment syndrome.

Question 676: A patient sustains a blunt injury to the abdomen and is hemodynamically stable. What is the next investigation?

A. X-ray abdomen
B. Barium swallow
C. FAST scan (Correct Answer)
D. DPL

Explanation: In the management of Blunt Trauma Abdomen (BTA), the primary goal is to identify intra-abdominal hemorrhage or hollow viscus injury. **Why FAST is the Correct Answer:** **FAST (Focused Assessment with Sonography for Trauma)** is the initial screening investigation of choice for both stable and unstable patients. It is rapid, non-invasive, and highly sensitive for detecting free intraperitoneal fluid (hemoperitoneum) in four specific areas: the Morison pouch (RUQ), splenorenal recess (LUQ), pelvis (Pouch of Douglas), and the pericardial sac. In a stable patient, a positive FAST often leads to a CECT (Gold Standard) for further characterization, while a negative FAST warrants observation or further testing. **Why Other Options are Incorrect:** * **X-ray Abdomen:** While it can show pneumoperitoneum (air under the diaphragm), it is insensitive for detecting hemoperitoneum or solid organ injury, which are more common in blunt trauma. * **Barium Swallow:** This is used for esophageal pathology and has no role in the acute evaluation of blunt abdominal trauma. * **DPL (Diagnostic Peritoneal Lavage):** Once the gold standard, it is now largely replaced by FAST. It is invasive and cannot detect retroperitoneal injuries. It is currently reserved for hemodynamically unstable patients when FAST is unavailable or inconclusive. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** CECT Abdomen (only for hemodynamically **stable** patients). * **Unstable Patient + Positive FAST:** Proceed directly to Emergency Laparotomy. * **Most common organ injured in BTA:** Spleen. * **FAST cannot detect:** Retroperitoneal bleed or hollow viscus perforation (less than 100ml fluid).

Question 677: Fasciotomy involves cutting all of the following structures except?

A. Skin
B. Superficial fascia
C. Deep fascia
D. Muscles (Correct Answer)

Explanation: ### Explanation **Concept:** Fasciotomy is a limb-saving surgical procedure performed to treat **Acute Compartment Syndrome**. The primary goal is to release the pressure within an osteofascial compartment by increasing its volume. This is achieved by dividing the non-compliant structures that restrict expansion. **Why Muscles (Option D) is the Correct Answer:** Fasciotomy involves cutting the skin and the restrictive fascial layers to decompress the underlying tissues. The **muscles themselves are never cut**; rather, they are the structures being protected. Cutting muscle would cause further functional loss, hemorrhage, and necrosis, exacerbating the injury. The goal is to allow the edematous muscle to bulge outward through the fascial incision to restore capillary perfusion. **Analysis of Incorrect Options:** * **Skin (A) and Superficial Fascia (B):** These must be incised to gain access to the deep compartments. In many cases, tight skin can contribute to the "envelope" effect that maintains high intracompartmental pressure. * **Deep Fascia (C):** This is the **most critical structure** to cut. The deep fascia is tough, inelastic, and primarily responsible for confining the muscle groups. Dividing it (e.g., the crural fascia in the leg) is the definitive step in decompression. **Clinical Pearls for NEET-PG:** * **Indication:** Perform fasciotomy when the clinical signs of compartment syndrome are present or when the **Delta Pressure** (Diastolic BP – Compartment Pressure) is **< 30 mmHg**. * **The "6 Ps":** Pain out of proportion to injury (earliest sign), Pallor, Paresthesia, Pulselessness (late sign), Paralysis, and Poikilothermia. * **Leg Fasciotomy:** The most common site. A **double-incision technique** is typically used to decompress all four compartments (Anterior, Lateral, Superficial Posterior, and Deep Posterior). * **Complication:** If not performed timely, **Volkmann’s Ischemic Contracture** may occur due to muscle infarction and fibrosis.

Question 678: A 19-year-old man presents with a stab wound at the base of the neck (zone I). What is the most important concern for patients with such injuries?

A. Upper extremity ischemia
B. Cerebral infarction
C. Exsanguinating hemorrhage (Correct Answer)
D. Mediastinitis

Explanation: **Explanation:** The base of the neck (**Zone I**) is defined as the area between the clavicles/sternal notch and the cricoid cartilage. This region is anatomically complex and contains major vascular structures, including the **subclavian vessels, the aortic arch, and the innominate veins.** **1. Why Exsanguinating Hemorrhage is the Correct Answer:** Injuries to Zone I are particularly lethal because the major vessels located here are large-caliber and high-flow. Unlike Zone II (mid-neck), where pressure can be easily applied to control bleeding, Zone I vessels are protected by the bony thorax (clavicles and sternum). This makes manual compression nearly impossible, leading to rapid, **uncontrolled exsanguination** into the pleural or mediastinal cavities. Hemorrhagic shock is the leading cause of immediate mortality in these patients. **2. Analysis of Incorrect Options:** * **A. Upper extremity ischemia:** While subclavian artery injury can cause limb ischemia, it is rarely the *most* immediate life-threatening concern compared to massive blood loss. * **B. Cerebral infarction:** This is a primary concern in **Zone II** injuries involving the carotid arteries. While Zone I contains the origins of the carotids, hemorrhage usually precedes neurological deficits in clinical priority. * **C. Mediastinitis:** This is a delayed complication (usually >24 hours) resulting from esophageal or tracheal perforation. It is not the most immediate concern in the acute trauma setting. **High-Yield Clinical Pearls for NEET-PG:** * **Roon and Christensen Classification:** * **Zone I:** Sternal notch to cricoid cartilage (Highest mortality due to hidden hemorrhage). * **Zone II:** Cricoid to angle of mandible (Most common; easiest to access surgically). * **Zone III:** Angle of mandible to base of skull (Difficult distal vascular control). * **Management:** Any patient with "hard signs" of vascular injury (pulsatile hematoma, active bleed, shock) requires immediate surgery. For Zone I, a **median sternotomy** or **clamshell thoracotomy** is often required for exposure.

Question 679: What is triage?

A. Treating the most serious cases first
B. Categorization of patients and treating them according to available resources (Correct Answer)
C. Cautery burns
D. Treating mentally ill patients

Explanation: **Explanation:** **Triage** is derived from the French word *trier*, meaning "to sort." In a clinical or disaster setting, it is the process of prioritizing patients based on the severity of their condition and the **prognosis in relation to available resources**. 1. **Why Option B is correct:** The fundamental goal of triage is to do the "greatest good for the greatest number." It is not merely about treating the sickest person first (which is the rule in standard ER settings), but about allocating limited resources efficiently during mass casualty incidents (MCI) to maximize survival. 2. **Why other options are incorrect:** * **Option A:** This describes standard emergency care. In a disaster (triage), a patient with a non-survivable "most serious" injury may be deprioritized to save several others with treatable injuries. * **Option C & D:** These are unrelated to the systematic sorting of trauma victims. **High-Yield Clinical Pearls for NEET-PG:** * **Color Coding System:** * **Red (Immediate):** Life-threatening but treatable (e.g., tension pneumothorax, airway obstruction). * **Yellow (Delayed):** Serious but not immediately life-threatening (e.g., stable long bone fractures). * **Green (Minimal):** "Walking wounded" with minor injuries. * **Black (Expectant):** Deceased or injuries so severe that survival is unlikely even with care. * **START Protocol:** Simple Triage and Rapid Treatment. It uses three criteria: **Respiration, Perfusion, and Mental Status (RPM).** * **Reverse Triage:** Used in military settings or specific situations where those who can be returned to duty/service most quickly are treated first.

Question 680: What is the recommended temperature of water for cooling a burn wound?

A. 20°C
B. 25°C
C. 10°C
D. 15°C (Correct Answer)

Explanation: The primary goal of immediate first aid in thermal burns is to stop the burning process and dissipate heat from the tissues. ### **Why 15°C is the Correct Answer** The recommended temperature for cooling a burn wound is **15°C (range 12°C–18°C)**. Using cool running tap water at this temperature for approximately **20 minutes** is the gold standard. * **Mechanism:** It limits the depth of the injury by reducing the "zone of stasis" (preventing it from progressing to the zone of coagulation). It also provides significant analgesia by stabilizing nerve endings and reduces local edema by causing mild vasoconstriction. ### **Analysis of Incorrect Options** * **A (20°C) & B (25°C):** While lukewarm water is better than no water, these temperatures are too close to core body temperature to effectively dissipate the deep tissue heat required to halt thermal progression in a timely manner. * **C (10°C):** Temperatures below 12°C, especially ice-cold water or ice (0°C), are contraindicated. Extreme cold causes intense **vasoconstriction**, which paradoxically worsens tissue ischemia and can lead to "frostbite" injury on top of the burn. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Rule of 20":** Apply **20**°C (or cool) water for **20** minutes within the first **20** minutes of injury (though it remains beneficial up to 3 hours post-burn). * **Avoid Ice:** Never apply ice directly to a burn; it increases the depth of tissue necrosis. * **Hypothermia Risk:** In large surface area burns (>10-15%), prolonged cooling can lead to systemic hypothermia. Always keep the rest of the patient warm while cooling the wound. * **Chemical Burns:** These require much longer irrigation (up to 1-2 hours) compared to thermal burns.

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Trauma — MCQs

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