Trauma — MCQs

A 26-year-old man is stabbed in the right intercostal space in the midclavicular line and presents to the emergency department. On examination, subcutaneous emphysema of the right chest wall, absent breath sounds, and a trachea shifted to the left are noted. What is the most likely serious diagnosis?

Trauma Indian Medical PG Practice Questions and MCQs

Question 91: CSF rhinorrhoea is commonest following a fracture to which anatomical structure?

A. Temporal bone
B. Cribriform plate (Correct Answer)
C. Nasal bones
D. Temporo-sphenoid region

Explanation: **Explanation:** **CSF Rhinorrhoea** occurs when there is a breach in the dura mater, arachnoid mater, and the bony floor of the anterior cranial fossa, creating a communication between the subarachnoid space and the nasal cavity. **Why Cribriform Plate is Correct:** The **cribriform plate of the ethmoid bone** is the most common site for CSF rhinorrhoea. Anatomically, it is extremely thin and fragile. Furthermore, the dura mater is tightly adherent to the bone in this region, making it highly susceptible to dural tears even with minor linear fractures of the anterior cranial fossa. **Analysis of Incorrect Options:** * **Temporal bone:** Fractures here (especially petrous part) more commonly lead to **CSF Otorrhoea**. While CSF can reach the nose via the Eustachian tube (paradoxical rhinorrhoea), it is less common than direct leakage via the ethmoid. * **Nasal bones:** These are extracranial structures. Fractures of the nasal bones cause epistaxis and deformity but do not involve the dural layers unless the underlying ethmoid bone is also fractured. * **Temporo-sphenoid region:** While sphenoid sinus fractures can cause rhinorrhoea, they are statistically less frequent than ethmoid/cribriform injuries. **Clinical Pearls for NEET-PG:** 1. **Diagnosis:** The most specific biochemical test is **Beta-2 Transferrin** (highly sensitive and specific for CSF). 2. **Target Sign/Halo Sign:** On a paper or linen, CSF forms a clear outer ring around a central red spot of blood. 3. **Management:** Most cases (80%) resolve with conservative management (bed rest, head elevation, avoiding straining). If persistent, endoscopic endonasal repair is the gold standard. 4. **Imaging:** **High-Resolution CT (HRCT)** of the paranasal sinuses is the investigation of choice to locate the bony defect.

Question 92: Which of the following investigations is/are true regarding rupture of the diaphragm?

A. Diagnostic peritoneal lavage (DPL), Repair by laparotomy, Laparoscopy
B. Chest X-ray, Repair by laparotomy, Laparoscopy (Correct Answer)
C. Chest X-ray, Repair by laparotomy
D. Chest X-ray, Diagnostic peritoneal lavage (DPL)

Explanation: **Explanation:** Diaphragmatic rupture is a critical diagnosis in trauma, often resulting from blunt (high-impact) or penetrating injuries. 1. **Why Option B is Correct:** * **Chest X-ray (CXR):** This is the initial screening tool of choice. Classic findings include a blurred diaphragmatic contour, "gastric bubble" in the chest, or the pathognomonic sign—the presence of a nasogastric tube (NGT) coiled in the thorax. * **Repair by Laparotomy:** In acute trauma, **laparotomy** is the preferred surgical approach because it allows for a thorough inspection of the abdominal cavity to manage frequently associated visceral injuries (e.g., splenic or liver lacerations). * **Laparoscopy:** This is highly sensitive and specific for diagnosing small diaphragmatic tears (especially on the left side) that may be missed by CT scans. It is both a diagnostic and therapeutic tool in hemodynamically stable patients. 2. **Why Other Options are Incorrect:** * **Diagnostic Peritoneal Lavage (DPL):** DPL is notoriously unreliable for diaphragmatic injuries because the diaphragm is a "hidden" area; blood may drain into the pleural space rather than the peritoneum, leading to a false-negative result. * **Options C and D:** These are incomplete. While CXR and laparotomy are standard, modern trauma protocols emphasize the role of laparoscopy/thoracoscopy for definitive diagnosis in occult injuries. **NEET-PG High-Yield Pearls:** * **Most Common Site:** The **left side** (posterolateral) is more commonly involved (80%) because the liver protects the right side. * **Gold Standard Diagnosis:** While CT is common, **Laparoscopy/Thoracoscopy** is the most accurate for identifying small injuries. * **Surgical Approach:** Use **Laparotomy** for acute cases; use **Thoracotomy** for chronic/delayed presentations (to manage adhesions in the chest). * **Sign to Remember:** The **"Grummel's sign"** refers to the visualization of bowel loops in the chest on X-ray.

Question 93: Penetrating neck trauma is defined as injury violating which structure?

A. 2 cm deep
B. Damaging a vital structure
C. Injury by a sharp object
D. Violating the platysma (Correct Answer)

Explanation: ### Explanation **1. Why the correct answer is right:** In surgical trauma management, a penetrating neck injury is defined anatomically by the **violation of the platysma muscle**. The platysma is a thin, superficial muscle of the neck located within the subcutaneous tissue. It serves as the critical surgical landmark because it acts as a protective barrier; if the platysma is breached, there is a significant risk of injury to deeper vital structures, including major vessels (carotid, jugular), the aerodigestive tract (trachea, esophagus), and nerves. Any wound deep to the platysma requires formal evaluation (imaging or exploration), whereas wounds superficial to it can often be managed with simple wound care. **2. Why the incorrect options are wrong:** * **Option A (2 cm deep):** Depth is subjective and unreliable in the neck due to varying anatomy. A 1 cm wound in a thin patient may be fatal, while a 3 cm wound in an obese patient may remain superficial. * **Option B (Damaging a vital structure):** This describes the *consequence* of a penetrating injury, not the definition. The definition is used to decide which patients need further investigation to *rule out* such damage. * **Option C (Injury by a sharp object):** This describes the mechanism (e.g., stab wound), but penetrating trauma can also be caused by high-velocity projectiles (bullets) or blunt objects that break the skin. **3. High-Yield Clinical Pearls for NEET-PG:** * **Zones of the Neck (Monson’s Classification):** * **Zone I:** Base of neck (Clavicle to Cricoid). Highest mortality due to thoracic outlet vessels. * **Zone II:** Cricoid to Angle of Mandible. Most common; easiest to access surgically. * **Zone III:** Angle of Mandible to Base of Skull. Difficult surgical access. * **Management Shift:** The traditional "mandatory exploration" for all injuries violating the platysma has been replaced by **Selective Non-operative Management (SNOM)**, guided by physical exam findings ("hard signs" vs. "soft signs") and CT Angiography. * **Hard Signs (Indicating immediate surgery):** Expanding hematoma, pulsatile bleeding, air bubbling from wound, or shock.

Question 94: What is true regarding 'Damage control surgery'?

A. Performed during a critical event
B. Performed during patient triage
C. Minimal intervention to stabilize the patient for later definitive surgery (Correct Answer)
D. Maximum possible surgical intervention considering the event

Explanation: **Explanation:** **Damage Control Surgery (DCS)** is a life-saving strategy used in major trauma patients who are physiologically exhausted. The core concept is to prioritize **physiology over anatomy**. Instead of performing a lengthy, definitive repair, the surgeon performs the absolute minimum necessary to stop bleeding and control contamination. * **Why Option C is Correct:** DCS aims to break the **"Lethal Triad"** (Acidosis, Hypothermia, and Coagulopathy). By performing minimal intervention (e.g., packing the liver, rapid bowel stapling without anastomosis), the surgeon can quickly transfer the patient to the ICU for physiological resuscitation. Definitive repair is delayed until the patient is stable (usually 24–48 hours later). **Analysis of Incorrect Options:** * **Option A:** While DCS is performed during a crisis, the term refers to a specific surgical *strategy*, not just the timing of the event. * **Option B:** Triage is the process of sorting patients based on the severity of their injuries; DCS is a surgical procedure that follows triage. * **Option D:** This is the opposite of DCS. "Maximum intervention" (Definitive Surgery) in a physiologically unstable patient often leads to the "bloody vicious cycle" and death on the operating table. **High-Yield Facts for NEET-PG:** 1. **The Three Stages of DCS:** * **Stage I:** Immediate laparotomy (Hemorrhage and contamination control, temporary abdominal closure). * **Stage II:** ICU Resuscitation (Rewarming, correcting coagulopathy/acidosis). * **Stage III:** Planned re-operation for definitive repair and closure. 2. **The Lethal Triad:** Hypothermia, Coagulopathy, and Metabolic Acidosis. 3. **Indication:** pH < 7.2, Temperature < 34°C, or massive transfusion requirements.

Question 95: Trauma to spleen in a stable patient is best diagnosed by?

A. X-ray abdomen
B. USG
C. CT scan (Correct Answer)
D. Diagnostic peritoneal lavage

Explanation: **Explanation:** The gold standard for diagnosing splenic trauma in a **hemodynamically stable** patient is a **Contrast-Enhanced Computed Tomography (CECT) scan**. **Why CT Scan is the Correct Choice:** In a stable patient, CECT provides the highest sensitivity and specificity. It allows for accurate **grading of the injury** (AAST Scale), identifies the presence of a "contrast blush" (indicating active extravasation), and evaluates the retroperitoneum and other solid organs. This information is crucial for deciding between non-operative management (NOM) and surgical intervention. **Analysis of Incorrect Options:** * **X-ray Abdomen:** This is non-specific. While it may show indirect signs like the "Ballance’s sign" or "Kehr’s sign" (referred pain), it cannot visualize parenchymal damage or grade the injury. * **USG (FAST):** Focused Assessment with Sonography for Trauma is the initial screening tool of choice for **unstable** patients. While it detects free intraperitoneal fluid (hemoperitoneum), it is operator-dependent and poor at grading specific organ injuries or detecting subcapsular hematomas. * **Diagnostic Peritoneal Lavage (DPL):** This is an invasive procedure used primarily in **unstable** patients when USG is unavailable. It is highly sensitive for blood but cannot localize the source of bleeding or grade the injury, often leading to unnecessary laparotomies. **Clinical Pearls for NEET-PG:** * **Hemodynamically Stable:** CECT is the investigation of choice. * **Hemodynamically Unstable:** FAST is the initial investigation of choice. * **Most common organ injured** in blunt trauma abdomen: Spleen (followed by Liver). * **Management Trend:** Most splenic injuries (Grades I-III) in stable patients are now managed conservatively (Non-operative management).

Question 96: What are the principles of treatment for a pyogenic infection of the skeletal system?

A. Analgesics
B. Antibiotics (Correct Answer)
C. Steroids
D. Non-operative management

Explanation: **Explanation:** Pyogenic infections of the skeletal system, such as **Acute Osteomyelitis** or **Septic Arthritis**, are primarily bacterial in origin (most commonly *Staphylococcus aureus*). The cornerstone of management is the prompt administration of **intravenous antibiotics** to eradicate the pathogen, prevent bone necrosis (sequestrum formation), and avoid systemic sepsis. **Why Antibiotics is the Correct Answer:** The pathophysiology involves bacterial proliferation within the metaphysis of long bones or the joint space. Early empirical antibiotic therapy (later tailored by culture and sensitivity) is mandatory to halt the inflammatory process and prevent the transition from acute to chronic osteomyelitis. **Analysis of Incorrect Options:** * **Analgesics (A):** While important for symptomatic pain relief, they do not treat the underlying infectious etiology and are considered supportive, not definitive, therapy. * **Steroids (C):** These are generally contraindicated as they suppress the immune response, potentially worsening the infection and delaying healing. * **Non-operative management (D):** While some early cases respond to antibiotics alone, "non-operative management" is a broad term. In many cases, surgical drainage (sequestrectomy or arthrotomy) is required if there is no response to antibiotics within 48 hours or if an abscess is present. **Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus* (overall); *Salmonella* (in Sickle Cell Anemia patients). * **Initial Investigation of Choice:** MRI (most sensitive for early changes). * **Gold Standard Diagnosis:** Bone aspiration/biopsy for culture. * **Rule of Thumb:** If clinical improvement is not seen within 24–48 hours of starting antibiotics, surgical decompression/drainage is indicated.

Question 97: A patient presented with acute respiratory insufficiency within one week of injury. Which of the following is NOT a potential cause?

A. Contusion of the lung
B. Fat embolism
C. Pneumothorax
D. Shock lung (Correct Answer)

Explanation: **Explanation:** The question asks for the condition that is **NOT** a potential cause of acute respiratory insufficiency within one week of injury. The correct answer is **Shock Lung (Option D)** because it is an outdated clinical term. **1. Why "Shock Lung" is the correct answer:** Historically, "Shock Lung" was used to describe what we now define as **Acute Respiratory Distress Syndrome (ARDS)**. In modern surgical practice and trauma classifications (such as the Berlin definition), "Shock Lung" is no longer considered a specific diagnosis or a distinct clinical entity. While ARDS itself is a major cause of respiratory failure post-trauma, the term "Shock Lung" is considered obsolete in contemporary medical literature and examinations. **2. Why the other options are incorrect (Potential causes):** * **Contusion of the lung:** This is the most common cause of respiratory failure following blunt chest trauma. It typically manifests within 24–48 hours as localized parenchymal hemorrhage and edema. * **Fat embolism:** Classically occurs 24–72 hours after long bone fractures (e.g., femur). It presents with the triad of respiratory distress, cerebral symptoms, and petechial rashes. * **Pneumothorax:** This can cause immediate or delayed respiratory insufficiency (if a simple pneumothorax progresses or is missed initially) due to lung collapse and ventilation-perfusion mismatch. **Clinical Pearls for NEET-PG:** * **ARDS Timing:** By definition, ARDS occurs within **one week** of a known clinical insult, with bilateral opacities on imaging not fully explained by effusions or heart failure. * **Fat Embolism Syndrome (FES):** Remember **Gurd’s Criteria** for diagnosis. The most common site for petechiae is the axilla and base of the neck. * **Pulmonary Contusion:** Management is supportive (analgesia and fluid restriction); avoid over-hydration as it worsens the contusion.

Question 98: A patient with burns presents to the emergency room and has started on intravenous fluids. What is the best method to assess the adequacy of volume replacement?

A. Pulse rate
B. Urine output (Correct Answer)
C. Systolic blood pressure
D. Central venous pressure

Explanation: **Explanation:** In the management of acute burn injury, the primary goal of fluid resuscitation is to maintain end-organ perfusion while avoiding fluid overload. **Why Urine Output (UOP) is the Correct Answer:** Urine output is considered the **most reliable, non-invasive, and sensitive clinical indicator** of visceral organ perfusion and cardiac output in burn patients. It reflects the adequacy of renal blood flow, which serves as a proxy for overall tissue perfusion. * **Target UOP for Adults:** 0.5 ml/kg/hr (or approx. 30–50 ml/hr). * **Target UOP for Children (<30kg):** 1 ml/kg/hr. * **Target UOP for Electrical Burns:** 75–100 ml/hr (to prevent acute tubular necrosis from myoglobinuria). **Why Other Options are Incorrect:** * **Pulse Rate & Systolic BP:** These are unreliable in the early stages of burns. The massive release of catecholamines (stress response) causes tachycardia and peripheral vasoconstriction, which may maintain blood pressure even in a state of significant hypovolemia. * **Central Venous Pressure (CVP):** While CVP measures right atrial pressure, it is an invasive procedure and does not always correlate with total intravascular volume in burn patients due to changes in pulmonary vascular resistance and chest wall compliance (especially in circumferential chest burns). **High-Yield Clinical Pearls for NEET-PG:** * **Parkland Formula:** 4 ml × TBSA% × Weight (kg). Give half in the first 8 hours and the remainder over the next 16 hours. * **Fluid of Choice:** Ringer’s Lactate (Isotonic crystalloid). * **Baxter’s Formula:** Same as Parkland but uses 4ml/kg/%. * **Modified Brooke Formula:** Uses 2ml/kg/%. * **Rule of 10s:** A simplified method for initial fluid rates: (TBSA% × 10) for patients 40–80 kg.

Question 99: Which fluid is commonly used for initial resuscitation in hypovolemic shock?

A. Ringer's Lactate (Correct Answer)
B. 0.9% Sodium Chloride
C. Whole Blood
D. 5% Dextrose in Water

Explanation: **Explanation:** In the management of hypovolemic shock, the primary goal of initial resuscitation is to restore intravascular volume and improve tissue perfusion. **Ringer’s Lactate (RL)** is the preferred choice (as per ATLS guidelines) because it is an isotonic crystalloid with an electrolyte composition that closely mimics human plasma. Unlike normal saline, RL contains lactate, which is metabolized by the liver into bicarbonate, helping to buffer the metabolic acidosis often associated with shock. **Analysis of Options:** * **0.9% Sodium Chloride (Normal Saline):** While isotonic and frequently used, it contains a supra-physiological concentration of chloride (154 mEq/L). Large volumes can lead to **hyperchloremic metabolic acidosis**, which can worsen the patient's acid-base status. * **Whole Blood:** This is not used for *initial* resuscitation. Crystalloids are started first while blood is being cross-matched. Blood products are indicated if the patient remains hemodynamically unstable after 1–2 liters of crystalloids (Class III/IV hemorrhage). * **5% Dextrose in Water (D5W):** This is a hypotonic solution once the glucose is metabolized. It rapidly leaves the intravascular space and enters the intracellular compartment, making it ineffective for volume expansion and potentially causing cerebral edema. **Clinical Pearls for NEET-PG:** * **Standard Initial Bolus:** 1 Liter of warmed isotonic crystalloid for adults (20 ml/kg for pediatrics). * **Balanced Salt Solutions:** RL and Plasmalyte are preferred over Normal Saline to prevent "Resuscitation-induced Hyperchloremia." * **Lactate Metabolism:** RL is contraindicated in patients with severe liver failure (who cannot metabolize lactate) or those receiving blood transfusions through the same line (calcium in RL may cause clotting).

Question 100: A 26-year-old man is stabbed in the right intercostal space in the midclavicular line and presents to the emergency department. On examination, subcutaneous emphysema of the right chest wall, absent breath sounds, and a trachea shifted to the left are noted. What is the most likely serious diagnosis?

A. Pneumothorax
B. Tension pneumothorax (Correct Answer)
C. Massive hemothorax
D. Hemopneumothorax

Explanation: ### Explanation The clinical presentation described is a classic medical emergency: **Tension Pneumothorax**. **1. Why Tension Pneumothorax is Correct:** A tension pneumothorax occurs when a "one-way valve" mechanism develops (due to blunt or penetrating trauma). Air enters the pleural space during inspiration but cannot escape during expiration. This leads to a progressive buildup of intrapleural pressure, causing: * **Ipsilateral lung collapse:** Resulting in absent breath sounds. * **Mediastinal shift:** Increased pressure pushes the trachea and heart toward the opposite (contralateral) side. * **Subcutaneous emphysema:** Air dissecting into the soft tissues of the chest wall. * **Hemodynamic instability:** (Implicitly the "serious" concern) as the shift compresses the vena cava, reducing venous return and leading to obstructive shock. **2. Why Other Options are Incorrect:** * **A. Pneumothorax:** While a simple pneumothorax features absent breath sounds, it does **not** cause a tracheal shift or significant mediastinal displacement. * **C. Massive Hemothorax:** Characterized by dullness on percussion (not hyper-resonance) and usually presents with collapsed neck veins due to hypovolemia, rather than the tracheal deviation seen here. * **D. Hemopneumothorax:** A combination of air and blood in the pleural space. While possible, the specific finding of **tracheal shift** signifies the "tension" component, which is the most critical diagnosis to address. **3. High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Tension pneumothorax is a **clinical diagnosis**. Do NOT wait for a Chest X-ray if the classic triad (absent breath sounds, tracheal shift, hypotension/distended neck veins) is present. * **Immediate Management:** Needle thoracocentesis (decompression). * *Adults:* 5th intercostal space, anterior to the mid-axillary line (ATLS 10th ed. update). * **Definitive Management:** Intercostal chest tube insertion (Tube Thoracostomy). * **Tracheal Shift:** Always shifts **away** from the side of the tension pneumothorax.

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Trauma — MCQs

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