Trauma — MCQs
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In traumatic cases, shock is most likely due to what?
A patient presents with lower chest trauma and abdominal pain. Their blood pressure is 60/40 mmHg and pulse is 120 beats/min. What is the next best investigation?
A 25-year-old man presented to the emergency department with severe colicky abdominal pain and vomiting after blunt abdominal trauma due to assault. CECT reveals an obstruction of the duodenum with a coiled spring appearance of the 2nd and 3rd parts of the duodenum. What is the next best step in the management of this patient?
All of the following are indications for CT scan in a patient with head injury except?
Paradoxical breathing is seen in which of the following conditions?
Pyramidal fracture of the maxilla is:
Animal and clinical studies have shown that administration of lactated Ringer's solution to patients with hypovolemic shock may what?
What is the most effective treatment for frostbite on the lower extremities?
A 45-year-old woman is admitted to the hospital after her automobile left the highway in a rainstorm and hit a tree. She had been wearing a seat belt. On radiographic examination, it is observed that she has suffered fractures of the ninth and tenth rib on her left side and that she has intraabdominal bleeding. Physical examination reveals hypovolemic shock and progressive hypotension. Which of the following organs is most likely injured to result in these clinical signs?
A Bristow elevator is used for which of the following procedures?
Trauma Indian Medical PG Practice Questions and MCQs
Question 631: In traumatic cases, shock is most likely due to what?
- A. Injury to an intra-abdominal solid organ (Correct Answer)
- B. Head injury
- C. Septicemia
- D. Cardiac failure
Explanation: In the context of trauma, the most common cause of shock is **hypovolemic (hemorrhagic) shock**. **Explanation of the Correct Answer:** **Injury to an intra-abdominal solid organ** (such as the spleen or liver) is a major cause of significant internal hemorrhage. The abdominal cavity can sequester large volumes of blood (up to several liters) without immediate external signs. In blunt trauma, the spleen is the most commonly injured organ, while the liver is the most common cause of fatal intra-abdominal hemorrhage. Rapid blood loss leads to decreased venous return, reduced cardiac output, and subsequent tissue hypoperfusion. **Why the other options are incorrect:** * **Head injury:** Isolated head injuries rarely cause shock in adults. If a patient with a head injury is in shock, the clinician must look for an extracranial source of bleeding (e.g., abdomen or chest). Shock in head injury usually only occurs as a terminal event (Cushing’s reflex). * **Septicemia:** While a cause of distributive shock, it typically develops days after the initial trauma due to secondary infections or bowel perforation, rather than being the immediate cause of shock in the acute setting. * **Cardiac failure:** Cardiogenic shock in trauma is usually due to blunt cardiac injury or tamponade, which are less frequent than hemorrhagic causes. **High-Yield Clinical Pearls for NEET-PG:** * **Golden Rule:** In any trauma patient, shock is **hemorrhagic** until proven otherwise. * **Most common organ injured (Blunt Trauma):** Spleen. * **Most common organ injured (Stab/Penetrating):** Liver. * **Lethal Triad of Trauma:** Acidosis, Coagulopathy, and Hypothermia. * **Initial Management:** The first step in managing hemorrhagic shock is volume resuscitation (crystalloids) and immediate hemorrhage control.
Question 632: A patient presents with lower chest trauma and abdominal pain. Their blood pressure is 60/40 mmHg and pulse is 120 beats/min. What is the next best investigation?
- A. CT abdomen
- B. USG FAST (Focused Assessment with Sonography for Trauma) (Correct Answer)
- C. MR Angiography
- D. X-ray abdomen
Explanation: ### Explanation The patient presents with signs of **hypovolemic shock** (BP 60/40 mmHg, Pulse 120 bpm) following blunt trauma. In an **hemodynamically unstable** patient, the primary goal is to identify the source of internal bleeding rapidly without moving the patient out of the resuscitation bay. **Why USG FAST is the Correct Answer:** FAST (Focused Assessment with Sonography for Trauma) is the investigation of choice for hemodynamically unstable patients with suspected abdominal or lower chest trauma. It is a rapid, non-invasive, bedside tool used to detect free intraperitoneal fluid (hemoperitoneum) or pericardial tamponade. In this scenario, a positive FAST would lead directly to an emergency laparotomy. **Why Other Options are Incorrect:** * **CT Abdomen:** While the "gold standard" for identifying specific organ injuries, it is **contraindicated** in unstable patients. CT requires the patient to be moved to the radiology suite, which is unsafe for someone with a BP of 60/40 mmHg ("Death begins in the CT scanner"). * **MR Angiography:** This is time-consuming, expensive, and has no role in the acute management of trauma resuscitation. * **X-ray Abdomen:** It has very low sensitivity for detecting hemoperitoneum or solid organ injury and delays definitive management. **Clinical Pearls for NEET-PG:** * **Hemodynamically Unstable + Positive FAST:** Proceed to Laparotomy. * **Hemodynamically Unstable + Negative FAST:** Look for other sources of blood loss (pelvis, long bones, or retroperitoneum) or consider DPL (Diagnostic Peritoneal Lavage). * **Hemodynamically Stable:** CT Abdomen with contrast is the investigation of choice. * **FAST Windows:** 1. Perihepatic (Morison’s Pouch), 2. Perisplenic, 3. Pelvic (Pouch of Douglas/Retrovesical), 4. Pericardial. E-FAST (Extended FAST) adds pleural views to detect pneumothorax/hemothorax.
Question 633: A 25-year-old man presented to the emergency department with severe colicky abdominal pain and vomiting after blunt abdominal trauma due to assault. CECT reveals an obstruction of the duodenum with a coiled spring appearance of the 2nd and 3rd parts of the duodenum. What is the next best step in the management of this patient?
- A. Nasogastric suction and observation (Correct Answer)
- B. Gastrojejunostomy
- C. Duodenal resection
- D. Duodenojejunostomy
Explanation: ### **Explanation** The clinical presentation of blunt abdominal trauma followed by delayed onset of colicky pain, vomiting, and the classic **"coiled spring appearance"** on CECT is pathognomonic for a **Duodenal Intramural Hematoma**. #### **1. Why Option A is Correct** Duodenal hematomas occur when blunt force (often a direct blow to the epigastrium) causes the rupture of subepithelial vessels, leading to blood accumulation between the submucosa and muscularis layers. This creates an intramural mass that obstructs the lumen. * **Management:** The vast majority of these cases are managed **conservatively**. * **Protocol:** Nasogastric (NG) suction for decompression, intravenous fluids, and total parenteral nutrition (TPN) if needed. Most hematomas resorb spontaneously within **2 to 3 weeks**. #### **2. Why Other Options are Incorrect** * **Options B, C, and D (Surgical Interventions):** Surgery is generally contraindicated as the first-line treatment. Procedures like Gastrojejunostomy or Duodenojejunostomy are reserved for cases where conservative management fails after 2–3 weeks or if there is a suspected duodenal perforation. Resection is rarely required unless there is extensive gangrene or devitalization. #### **3. NEET-PG High-Yield Pearls** * **Mechanism:** Most common in children and young adults due to the lack of abdominal fat and the fixed position of the duodenum against the vertebral column. * **Radiology:** * **Barium Study:** "Coiled spring" or "Stacked coin" appearance (due to crowded mucosal folds). * **CT Scan:** Choice of investigation; shows a high-attenuation intramural mass. * **Key Association:** Always rule out **concomitant pancreatitis**, as the trauma or the hematoma itself can obstruct the pancreatic duct. * **Indications for Surgery:** Peritonitis (suggesting perforation), failure of hematoma to resolve after 14–21 days of conservative therapy, or rapid expansion of the hematoma.
Question 634: All of the following are indications for CT scan in a patient with head injury except?
- A. Focal neurological deficit
- B. Glasgow Coma Scale <13 at presentation
- C. An episode of vomiting (Correct Answer)
- D. Patient is on warfarin
Explanation: In the management of head injuries, the decision to perform a CT scan is guided by clinical decision rules like the **Canadian CT Head Rule (CCHR)** and **NICE guidelines**. **Why "An episode of vomiting" is the correct answer:** According to the Canadian CT Head Rule, **two or more episodes** of vomiting are required to justify a CT scan. A single, isolated episode of vomiting in an otherwise stable patient is not a high-risk indicator for intracranial hemorrhage and does not mandate immediate imaging. **Explanation of Incorrect Options:** * **Focal neurological deficit:** This is a "High Risk" criteria. Any deficit (e.g., limb weakness, cranial nerve palsy) suggests a localized brain injury or mass effect (like an EDH or SDH), requiring urgent CT. * **GCS <13 at presentation:** A GCS score of <13 at any point, or <15 two hours after injury, indicates a significant risk of neurosurgical intervention. * **Patient is on warfarin:** Patients on anticoagulants (Warfarin, NOACs) or antiplatelets are at high risk for "delayed intracranial hemorrhage," even after minor trauma. Imaging is mandatory regardless of the GCS score. **High-Yield Clinical Pearls for NEET-PG:** * **Canadian CT Head Rule (High Risk for Intervention):** GCS <15 at 2 hours, suspected open/depressed skull fracture, signs of basal skull fracture (Battle’s sign, Raccoon eyes), **≥2 episodes of vomiting**, and age ≥65. * **Retrograde Amnesia:** Amnesia of events >30 minutes before the impact is an indication for CT. * **Gold Standard:** Non-Contrast CT (NCCT) Head is the investigation of choice for acute head trauma to rule out hemorrhage.
Question 635: Paradoxical breathing is seen in which of the following conditions?
- A. Pneumonia
- B. Pneumothorax
- C. Atelectasis
- D. Flail chest (Correct Answer)
Explanation: ### Explanation **Correct Answer: D. Flail Chest** **Mechanism of Paradoxical Breathing:** Flail chest occurs when **three or more contiguous ribs are fractured in two or more places**, creating a segment of the chest wall that is no longer bone-anchored to the rest of the thoracic cage. * **Inspiration:** Normally, the chest wall expands outward due to negative intrathoracic pressure. In flail chest, this negative pressure sucks the detached (flail) segment **inward**. * **Expiration:** As intrathoracic pressure becomes positive to push air out, the flail segment is pushed **outward**. This "reverse" movement relative to the rest of the chest wall is termed **paradoxical breathing**. It significantly impairs ventilation and is often associated with underlying pulmonary contusion. **Why Other Options are Incorrect:** * **A. Pneumonia:** This is an infectious consolidation of lung parenchyma. While it causes tachypnea and accessory muscle use, the chest wall moves symmetrically. * **B. Pneumothorax:** Characterized by air in the pleural space. Clinical signs include decreased breath sounds and hyper-resonance, but the chest wall typically shows decreased movement on the affected side, not paradoxical movement. * **C. Atelectasis:** This refers to alveolar collapse. It may cause a mediastinal shift toward the affected side in massive cases, but it does not cause a segment of the chest wall to move paradoxically. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Flail chest is primarily a **clinical diagnosis** made by observation of chest wall motion. * **Management:** The mainstay of treatment is **adequate analgesia** (often epidural) and aggressive pulmonary toilet. * **Indication for Intubation:** Mechanical ventilation is not mandatory for all cases; it is reserved for patients with respiratory failure (PaO2 <60 mmHg or Sat <90% on room air) or severe associated injuries. * **Associated Injury:** The most common cause of hypoxia in flail chest is the underlying **pulmonary contusion**, not the paradoxical movement itself.
Question 636: Pyramidal fracture of the maxilla is:
- A. Le Fort I
- B. Le Fort II (Correct Answer)
- C. Le Fort III
- D. Craniofacial disruption
Explanation: **Explanation:** The Le Fort classification system is used to categorize fractures of the midface based on the lines of weakness in the facial skeleton. **Le Fort II (Pyramidal Fracture):** This is the correct answer because the fracture line takes a pyramidal shape. It extends from the nasal bridge through the frontal process of the maxilla, lacrimal bones, and inferior orbital rim, then passes through the zygomaticomaxillary suture and into the pterygoid plates. The result is a pyramid-shaped segment of the midface (including the nose and palate) that becomes mobile. **Incorrect Options:** * **Le Fort I (Guerin’s Fracture):** This is a **horizontal** fracture. It separates the alveolar process and palate from the rest of the maxilla. It is often called a "floating palate." * **Le Fort III (Craniofacial Disjunction):** This is a complete separation of the facial bones from the cranial base. The fracture line passes through the frontonasal suture, orbits, and zygomatic arches. * **Craniofacial Disruption:** This is a general descriptive term often used synonymously with Le Fort III, but it is not the specific anatomical name for a pyramidal fracture. **Clinical Pearls for NEET-PG:** * **Key Clinical Sign:** In Le Fort II and III, "dish-face" deformity and CSF rhinorrhea (due to cribriform plate involvement) may be seen. * **Airway Management:** In severe midface trauma, avoid blind nasotracheal intubation if a cribriform plate fracture is suspected. * **Pterygoid Plates:** All three Le Fort fractures involve the pterygoid plates; if these are not fractured, it is not a classic Le Fort injury. * **Sensory Deficit:** Infraorbital nerve anesthesia is most common in Le Fort II due to the involvement of the inferior orbital rim.
Question 637: Animal and clinical studies have shown that administration of lactated Ringer's solution to patients with hypovolemic shock may what?
- A. Increase serum lactate concentration
- B. Impair liver function
- C. Improve hemodynamics by alleviating the deficit in the interstitial fluid compartment (Correct Answer)
- D. Increase metabolic acidosis
Explanation: ### Explanation The management of hypovolemic shock relies on restoring both intravascular volume and the **interstitial fluid deficit**. In hemorrhagic shock, fluid shifts from the interstitial space into the intravascular compartment to maintain blood pressure (transcapillary refill). This leaves the interstitium severely depleted. **Why Option C is Correct:** Lactated Ringer’s (LR) is an isotonic crystalloid. Unlike colloids, which primarily stay in the vessels, crystalloids equilibrate across the extracellular fluid (ECF) compartment. Administration of LR not only expands the plasma volume but, more importantly, **replenishes the interstitial fluid deficit**. This stabilization of the ECF is crucial for improving overall hemodynamics and cellular perfusion. **Analysis of Incorrect Options:** * **Option A & D:** While LR contains lactate, it is **sodium lactate**, not lactic acid. In the liver, this lactate is metabolized into **bicarbonate**, which actually helps buffer and **improve metabolic acidosis** rather than worsening it or increasing serum lactate levels (unless the patient has end-stage liver failure). * **Option B:** LR does not impair liver function. In fact, by improving visceral perfusion and reversing shock, it helps protect the liver from ischemic injury. **NEET-PG High-Yield Pearls:** * **Fluid of Choice:** LR is the preferred initial crystalloid in trauma (ATLS guidelines) because its electrolyte composition is more physiological than Normal Saline (0.9% NaCl). * **Normal Saline Risk:** Large volumes of 0.9% NaCl can lead to **Hyperchloremic Metabolic Acidosis**. * **Lactate Metabolism:** The conversion of lactate to bicarbonate requires oxidative metabolism; therefore, LR should be used cautiously in patients with severe hepatic dysfunction. * **The 3:1 Rule:** Traditionally, 3 mL of crystalloid is required for every 1 mL of blood lost to account for the shift into the interstitium.
Question 638: What is the most effective treatment for frostbite on the lower extremities?
- A. Rewarming with friction and/or massage
- B. Rewarming with blankets
- C. Rewarming with immersion in warm water (Correct Answer)
- D. Rewarming with encouragement of walking on warm surfaces
Explanation: **Explanation:** The primary goal in treating frostbite is to restore tissue temperature rapidly and uniformly to prevent further ice crystal formation and minimize tissue necrosis. **Why Option C is Correct:** **Rapid Active Rewarming** via immersion in a controlled water bath is the gold standard. The water should be maintained at a temperature of **40°C to 42°C (104°F to 108°F)**. This temperature range is warm enough to thaw tissues efficiently but not hot enough to cause thermal burns. Rewarming should continue until the distal part of the extremity becomes flushed (hyperemic), which typically takes 20–30 minutes. **Why Incorrect Options are Wrong:** * **Option A (Friction/Massage):** This is strictly contraindicated. Frostbitten tissue contains ice crystals; mechanical friction or massage can cause significant mechanical trauma and worsen tissue damage. * **Option B (Blankets):** This is a form of passive rewarming. While useful for systemic hypothermia, it is too slow for frostbite and increases the risk of progressive ischemia. * **Option D (Walking):** Weight-bearing on a frostbitten limb causes mechanical "grinding" of frozen tissues, leading to irreversible damage. Patients should be kept non-weight-bearing until the limb is fully thawed. **High-Yield Clinical Pearls for NEET-PG:** 1. **Thaw-Refreeze Cycle:** Never initiate rewarming if there is a risk of the tissue refreezing before reaching definitive care. Refreezing causes the most severe tissue damage. 2. **Analgesia:** Rapid rewarming is extremely painful; parenteral opioids are often required. 3. **Blister Management:** Clear blisters (contain prostaglandins/thromboxanes) should be aspirated or debrided, while hemorrhagic blisters (indicate deeper damage) should be left intact to prevent infection. 4. **Prophylaxis:** Tetanus prophylaxis is mandatory in all frostbite cases.
Question 639: A 45-year-old woman is admitted to the hospital after her automobile left the highway in a rainstorm and hit a tree. She had been wearing a seat belt. On radiographic examination, it is observed that she has suffered fractures of the ninth and tenth rib on her left side and that she has intraabdominal bleeding. Physical examination reveals hypovolemic shock and progressive hypotension. Which of the following organs is most likely injured to result in these clinical signs?
- A. Liver
- B. Pancreas
- C. Left kidney
- D. Spleen (Correct Answer)
Explanation: ### Explanation **Correct Answer: D. Spleen** The spleen is the most frequently injured organ in blunt abdominal trauma. In this clinical scenario, the mechanism of injury (motor vehicle accident with seatbelt use) and the specific anatomical markers (fractures of the **left 9th and 10th ribs**) strongly point toward splenic laceration. The spleen is located in the left hypochondrium, protected by the 9th through 11th ribs; thus, fractures in this region often result in direct parenchymal injury or capsule rupture. The presentation of **hypovolemic shock** and progressive hypotension indicates significant intraperitoneal hemorrhage, a hallmark of high-grade splenic trauma. **Analysis of Incorrect Options:** * **A. Liver:** While the liver is the second most common organ injured in blunt trauma, it is located in the right upper quadrant. It would more likely be associated with fractures of the right lower ribs. * **B. Pancreas:** The pancreas is a retroperitoneal organ. Injuries usually result from direct epigastric blows (e.g., handlebar injuries) and typically present with signs of peritonitis or localized pain rather than rapid, massive exsanguination. * **C. Left Kidney:** Although the left kidney is near the 10th rib, it is a retroperitoneal structure. While injury can cause hypotension, it more classically presents with hematuria and flank ecchymosis (Grey Turner sign) rather than rapid intraabdominal bleeding. **NEET-PG High-Yield Pearls:** * **Most common organ injured in blunt trauma:** Spleen (Overall), but Liver is most common in some specific series involving penetrating trauma. * **Kehr’s Sign:** Referred pain to the left shoulder due to diaphragmatic irritation by splenic blood (classic exam finding). * **Investigation of Choice:** **CECT Abdomen** is the gold standard for hemodynamically stable patients; **FAST** (Focused Assessment with Sonography for Trauma) is preferred for unstable patients. * **Overtwhelming Post-Splenectomy Infection (OPSI):** The most feared long-term complication; caused by encapsulated organisms (*S. pneumoniae, H. influenzae, N. meningitidis*).
Question 640: A Bristow elevator is used for which of the following procedures?
- A. Luxating teeth.
- B. Elevating a fractured zygomatic bone. (Correct Answer)
- C. Reduction of a nasal complex fracture.
- D. All of the above.
Explanation: The **Bristow elevator** is a specialized surgical instrument primarily used in maxillofacial surgery for the **reduction of zygomatic bone fractures** (specifically zygomatic arch or malar complex fractures). ### Why Option B is Correct: The zygomatic bone is often displaced medially and inferiorly during trauma. The Bristow elevator is designed with a sturdy, slightly curved blade that allows the surgeon to apply significant leverage. In the **Gilles’ temporal approach**, a small incision is made in the temporal hairline; the elevator is then passed deep to the temporal fascia and superficial to the temporalis muscle to reach the medial surface of the zygomatic bone, "elevating" it back into its anatomical position. ### Why Other Options are Incorrect: * **Option A (Luxating teeth):** While elevators are used in dentistry (e.g., Coupland’s or Cryer’s elevators), the Bristow elevator is too large and lacks the specific tip geometry required for dental luxation. * **Option C (Reduction of nasal complex fracture):** Nasal fractures are typically reduced using instruments like the **Walsham’s forceps** (for the septum) or **Asch’s forceps** (for the nasal bones), which are designed to grasp and manipulate the thin nasal architecture. ### NEET-PG High-Yield Pearls: * **Gilles’ Approach:** The classic surgical approach for using a Bristow elevator to reduce a zygomatic arch fracture. * **Rowe’s Zygomatic Elevator:** Another common instrument used for the same purpose; it is often heavier and more robust than the Bristow. * **Key Landmark:** When using the Bristow elevator, the instrument must stay **deep to the deep temporal fascia** to avoid damaging the frontal branch of the facial nerve.
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Initial Assessment of Trauma Patient
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Advanced Trauma Life Support (ATLS) Principles
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Chest Trauma
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Abdominal Trauma
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Head Trauma
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Spinal Trauma
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Extremity Trauma
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Vascular Trauma
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Genitourinary Trauma
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Burns Management
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Mass Casualty Management
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Damage Control Surgery
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