Trauma — MCQs

A 26-year-old man is resuscitated with packed red blood cells following a motor vehicle collision complicated by a fractured pelvis and resultant hemorrhage. A few hours later the patient becomes hypotensive with a normal central venous pressure (CVP), oliguric, and febrile. Upon examination, the patient is noted to have profuse oozing of blood from his intravenous (IV) sites. Which of the following is the most likely diagnosis?

Q233Medium

A 26-year-old man presents to the emergency department following a vehicular accident where a truck ran over him. A chest X-ray reveals an air-fluid level in the left lung and a nasogastric tube coiled upward into the left chest. What is the next best step in the management of this patient?

Q234Medium

Increased central venous pressure (CVP) and pulmonary wedge pressure (PWP) are typically seen in which type of shock?

Q235Medium

What is the investigation of choice for diagnosing intra-abdominal bleeding in an unstable patient?

Q236Easy

What is the first priority in the management of a burn injury?

Q237Medium

In children below 8 years of age, a high level of craniofacial disjunction (Le Fort III classification) is rarely seen because?

Q238Easy

Which nerve has the best prognosis after repair?

Q239Easy

What is the name of the wiring technique used for mandibular fractures?

Q240Easy

Which of the following causes maximum bleeding?

Trauma Indian Medical PG Practice Questions and MCQs

Question 231: A 70-year-old man presents with acute abdominal pain, a pulsating abdominal mass, and shock. What is the most appropriate immediate management?

A. Administer 6 units of blood transfusion.
B. Perform a CT scan of the abdomen to diagnose the aneurysm. (Correct Answer)
C. Immediately transfer the patient to the Operating Theatre for exploration of the abdomen.
D. Perform a laparotomy.

Explanation: ### Explanation The clinical triad of **acute abdominal/back pain, a pulsating abdominal mass, and hypotension (shock)** is pathognomonic for a **Ruptured Abdominal Aortic Aneurysm (rAAA)**. **Why Option B is Correct:** In modern vascular surgery protocols, a **CT Angiography (CTA)** of the abdomen is the gold standard for diagnosis. Even in hemodynamically unstable patients, if the diagnosis is in doubt or if the patient can be stabilized briefly, a rapid CT scan is preferred. It confirms the diagnosis, assesses the anatomy for suitability of **Endovascular Aneurysm Repair (EVAR)** versus open repair, and rules out other pathologies. Current guidelines suggest that if a CT can be performed immediately (within minutes), it is the most appropriate next step to plan the surgical approach. **Why Other Options are Wrong:** * **Option A:** While resuscitation is vital, administering 6 units of blood without definitive source control is inadequate. Over-resuscitation can lead to "pop-the-clot" phenomenon, worsening the hemorrhage. * **Options C & D:** While "immediate surgery" was the traditional teaching for unstable patients, modern management emphasizes "Permissive Hypotension" and rapid imaging to determine if the patient is a candidate for EVAR, which has lower perioperative mortality than open laparotomy. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Triad:** Pain + Pulsatile Mass + Hypotension (present in only 25-50% of cases). 2. **Permissive Hypotension:** Maintain systolic BP between 70–90 mmHg to prevent dislodging the compensatory clot until the aorta is clamped. 3. **Investigation of Choice:** CT Angiography (CTA). 4. **Screening:** USG is used for screening; CTA is used for surgical planning. 5. **Management:** EVAR is increasingly preferred over open laparotomy if the anatomy is favorable.

Question 232: A 26-year-old man is resuscitated with packed red blood cells following a motor vehicle collision complicated by a fractured pelvis and resultant hemorrhage. A few hours later the patient becomes hypotensive with a normal central venous pressure (CVP), oliguric, and febrile. Upon examination, the patient is noted to have profuse oozing of blood from his intravenous (IV) sites. Which of the following is the most likely diagnosis?

A. Hypovolemic shock
B. Acute adrenal insufficiency
C. Gram-negative bacteremia
D. Transfusion reaction (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Transfusion Reaction (Acute Hemolytic Transfusion Reaction - AHTR)** The patient is presenting with the classic triad of an **Acute Hemolytic Transfusion Reaction (AHTR)**, typically caused by ABO incompatibility. In an anesthetized or trauma patient, the signs can be subtle, but the development of **fever, hypotension (despite normal CVP), and oliguria** (due to acute tubular necrosis from free hemoglobin) are hallmark indicators. The most definitive sign in this scenario is **DIC (Disseminated Intravascular Coagulation)**, manifested as profuse oozing from IV sites and surgical wounds. **Why Incorrect Options are Wrong:** * **A. Hypovolemic shock:** While hypotension and oliguria occur, hypovolemic shock would present with a **low CVP** and would not typically cause fever or spontaneous oozing from IV sites unless it progressed to massive transfusion-related coagulopathy (which usually lacks the febrile component). * **B. Acute adrenal insufficiency:** Can cause hypotension and fever, but it does not typically cause DIC/oozing or acute renal failure (oliguria) so rapidly in a trauma setting without prior steroid use or bilateral adrenal hemorrhage (Waterhouse-Friderichsen). * **C. Gram-negative bacteremia:** While it causes fever, hypotension, and DIC (septic shock), it usually has a longer incubation period than "a few hours" post-trauma and is less likely than a transfusion reaction in a patient who just received PRBCs. **High-Yield Pearls for NEET-PG:** * **Most common cause of AHTR:** Clerical error (mislabeling or improper identification). * **Pathophysiology:** Type II Hypersensitivity; host antibodies attack donor RBCs leading to complement activation. * **First Step in Management:** Stop the transfusion immediately and initiate aggressive fluid resuscitation to protect the kidneys. * **Diagnosis:** Check for hemoglobinuria, perform a Direct Antiglobulin Test (DAT/Coombs), and re-match the blood.

Question 233: A 26-year-old man presents to the emergency department following a vehicular accident where a truck ran over him. A chest X-ray reveals an air-fluid level in the left lung and a nasogastric tube coiled upward into the left chest. What is the next best step in the management of this patient?

A. Placement of a chest tube on the left side
B. Thoracotomy
C. Diagnostic peritoneal lavage
D. Laparotomy (Correct Answer)

Explanation: ### **Explanation** The clinical presentation of an air-fluid level in the chest and a **nasogastric (NG) tube coiled in the left hemithorax** is pathognomonic for a **Traumatic Diaphragmatic Rupture (TDR)** with herniation of abdominal contents (usually the stomach) into the thoracic cavity. #### **Why Laparotomy is the Correct Answer** In the acute phase of trauma, **Laparotomy** is the preferred surgical approach for repairing a diaphragmatic injury. This is because: 1. It allows for the easy reduction of herniated abdominal organs back into the peritoneal cavity. 2. It provides a superior view to evaluate and manage associated intra-abdominal injuries (liver, spleen, or bowel), which are present in up to 80-90% of blunt trauma cases. 3. The diaphragm is repaired using non-absorbable sutures. #### **Why Other Options are Incorrect** * **A. Placement of a chest tube:** This is dangerous. If a chest tube is inserted blindly when the stomach is in the chest, it can result in **iatrogenic perforation of the stomach**, leading to tension fecopneumothorax or empyema. * **B. Thoracotomy:** While the diaphragm can be repaired via the chest, this approach is reserved for **chronic/delayed presentations** (to manage adhesions) or if there are specific thoracic injuries requiring intervention. * **C. Diagnostic Peritoneal Lavage (DPL):** DPL has low sensitivity for isolated diaphragmatic injuries and is unnecessary here as the diagnosis is already evident from the X-ray. #### **NEET-PG High-Yield Pearls** * **Mechanism:** Most commonly occurs on the **left side** (80%) because the liver protects the right side. * **Gold Standard Diagnosis:** While CXR is the initial screening tool, **Contrast CT Scan** is the investigation of choice (showing the "collar sign" or "dependent viscera sign"). * **Surgical Rule:** Acute trauma = **Laparotomy**; Chronic/Late presentation = **Thoracotomy**. * **Classic Sign:** Bowel sounds heard in the chest during auscultation.

Question 234: Increased central venous pressure (CVP) and pulmonary wedge pressure (PWP) are typically seen in which type of shock?

A. Cardiogenic shock (Correct Answer)
B. Neurogenic shock
C. Hypovolemic shock
D. Septic shock

Explanation: ### Explanation The core concept in this question is the differentiation of shock based on hemodynamic parameters. **1. Why Cardiogenic Shock is Correct:** In **Cardiogenic shock**, the primary pathology is pump failure (e.g., Myocardial Infarction). Because the heart cannot effectively eject blood, it "backs up" into the systemic and pulmonary circulation. * **Increased CVP:** Reflects high pressure in the right atrium due to the heart's inability to move blood forward. * **Increased PWP:** Reflects high pressure in the left atrium and pulmonary capillaries. This is a hallmark of cardiogenic shock and distinguishes it from other forms of shock. **2. Why the Other Options are Incorrect:** * **Hypovolemic Shock:** There is a primary loss of fluid/blood volume. This leads to **decreased** CVP and **decreased** PWP because the "tank is empty." * **Neurogenic Shock:** A type of distributive shock where loss of sympathetic tone causes massive vasodilation. This leads to "pooling" of blood in the periphery, resulting in **decreased** CVP and PWP. * **Septic Shock:** Early (hyperdynamic) septic shock involves vasodilation and capillary leak. Similar to neurogenic shock, the CVP and PWP are typically **low or normal**. **3. NEET-PG High-Yield Clinical Pearls:** * **Obstructive Shock:** (e.g., Cardiac Tamponade, Tension Pneumothorax) also presents with **increased CVP**, but PWP may vary. In Tamponade, all diastolic pressures (CVP, PA Diastolic, PWP) tend to equalize. * **The "Cold vs. Warm" Rule:** Cardiogenic and Hypovolemic shock present with cold, clammy extremities (high systemic vascular resistance). Septic and Neurogenic shock often present with warm extremities (low systemic vascular resistance). * **PWP** is the most accurate clinical reflection of **Left Atrial Pressure**.

Question 235: What is the investigation of choice for diagnosing intra-abdominal bleeding in an unstable patient?

A. CT scan
B. MRI scan
C. Ultrasound (USG) (Correct Answer)
D. Diagnostic peritoneal lavage

Explanation: **Explanation:** The management of abdominal trauma is primarily dictated by the patient's **hemodynamic stability**. **Why Ultrasound (USG) is correct:** In an **unstable patient** (tachycardia, hypotension, or altered sensorium), the goal is a rapid, non-invasive bedside assessment to identify life-threatening hemorrhage. **FAST (Focused Assessment with Sonography for Trauma)** is the investigation of choice. It is highly sensitive for detecting free intraperitoneal fluid (hemoperitoneum) in the Morison’s pouch, splenorenal recess, and pelvis. Its portability allows it to be performed simultaneously with resuscitation without moving the patient. **Why other options are incorrect:** * **CT Scan:** While the "Gold Standard" for identifying specific organ injuries and retroperitoneal bleeds, it is **contraindicated in unstable patients** because it requires transporting the patient to the radiology suite ("Death in the CT suite"). * **MRI Scan:** It has no role in acute trauma due to long acquisition times and incompatibility with resuscitation equipment. * **Diagnostic Peritoneal Lavage (DPL):** Once the gold standard, it is now largely replaced by FAST. It is invasive, time-consuming, and carries a risk of iatrogenic injury. It is reserved for cases where FAST is inconclusive or unavailable in an unstable patient. **High-Yield Clinical Pearls for NEET-PG:** * **Stable Patient + Blunt Trauma:** CECT Abdomen is the investigation of choice. * **Unstable Patient + Positive FAST:** Proceed directly to **Exploratory Laparotomy**. * **FAST Components:** Evaluates 4 areas—Hepatorenal pouch, Splenorenal pouch, Pelvis (Pouch of Douglas), and Pericardium. * **Limitation of FAST:** It cannot reliably detect retroperitoneal hemorrhage or hollow viscus perforation.

Question 236: What is the first priority in the management of a burn injury?

A. Exposure
B. Fluid resuscitation
C. Circulation
D. Airway control (Correct Answer)

Explanation: **Explanation:** The management of a burn patient follows the standard **Advanced Trauma Life Support (ATLS)** protocol, where the primary survey begins with **ABCDE**. **1. Why Airway Control is the First Priority:** In burn injuries, the airway is the most critical immediate concern due to the risk of **inhalation injury**. Thermal injury to the upper airway can lead to rapid, life-threatening edema. If a patient presents with signs of inhalation injury (e.g., singed nasal hairs, carbonaceous sputum, or facial burns), the airway must be secured via endotracheal intubation immediately, as subsequent swelling may make later intubation impossible. **2. Why other options are incorrect:** * **Circulation (C) and Fluid Resuscitation (B):** While fluid resuscitation is vital in burns to prevent hypovolemic shock (using the Parkland formula), it follows Airway (A) and Breathing (B) in the priority sequence. Circulation is the "C" in ABCDE. * **Exposure (E):** This is the final step of the primary survey. While important to remove smoldering clothing and assess the Total Body Surface Area (TBSA) of the burn, it is never prioritized over life-saving airway management. **Clinical Pearls for NEET-PG:** * **Indication for early intubation:** Stridor, hoarseness, or use of accessory muscles in a burn victim. * **Carbon Monoxide (CO) Poisoning:** Always suspect this in closed-space fires. Treat with 100% humidified oxygen. Note that pulse oximetry is unreliable in CO poisoning as it cannot distinguish carboxyhemoglobin from oxyhemoglobin. * **Rule of Nines:** Used for rapid TBSA assessment; remember that first-degree burns (erythema only) are **not** included in fluid calculations.

Question 237: In children below 8 years of age, a high level of craniofacial disjunction (Le Fort III classification) is rarely seen because?

A. Children in this age group rarely experience such traumatic incidents.
B. The facial skeleton is covered with thick soft tissue.
C. There is a lack of poorly developed ethmoidal and sphenoidal sinuses. (Correct Answer)
D. The line of demarcation between medullary and cortical bone is less evident.

Explanation: ### Explanation **1. Why Option C is Correct:** The pediatric facial skeleton is remarkably resilient to fractures compared to adults due to its unique anatomy. In children under 8 years of age, the **paranasal sinuses (specifically the ethmoidal and sphenoidal sinuses) are poorly developed or pneumatized.** In adults, these air-filled sinuses act as "lines of weakness" or structural voids that allow fracture lines to propagate across the craniofacial skeleton (the Le Fort pathways). In young children, the absence of these voids means the midface is a solid, compact block of bone. Additionally, the high **tooth-to-bone ratio** (with unerupted teeth acting as internal reinforcement) and the high elasticity of pediatric bone further prevent the complex disjunction seen in Le Fort III fractures. **2. Why Other Options are Incorrect:** * **Option A:** While the mechanism of injury differs (falls vs. high-velocity RTA), children are frequently involved in trauma. The rarity of Le Fort III is due to anatomy, not a lack of exposure to trauma. * **Option B:** While children do have a thicker subcutaneous fat pad, this provides protection against soft tissue injury but does not account for the structural resistance of the underlying bone to specific fracture patterns. * **Option D:** While pediatric bone is more cancellous and has a different medullary-to-cortical ratio, this contributes to "greenstick" fractures rather than preventing craniofacial disjunction. The primary anatomical deterrent is the lack of sinus pneumatization. **3. High-Yield Clinical Pearls for NEET-PG:** * **Le Fort III (Craniofacial Disjunction):** The fracture line passes through the frontozygomatic suture, orbit, and ethmoid bone, separating the entire midface from the skull base. * **Pediatric Skull vs. Face:** In infants, the **cranium-to-face ratio is 8:1**. By adulthood, it becomes 2:1. Because the forehead is more prominent in children, **cranial/frontal bone injuries** are more common than midface fractures. * **Most Common Pediatric Facial Fracture:** Nasal bone fractures (similar to adults). * **Growth Centers:** Trauma to the pediatric midface is critical because it can disrupt the **synchondroses**, leading to future growth retardation and facial asymmetry.

Question 238: Which nerve has the best prognosis after repair?

A. Radial nerve (Correct Answer)
B. Median nerve
C. Sciatic nerve
D. Ulnar nerve

Explanation: **Explanation:** The prognosis of nerve repair depends on several factors, including the nerve's composition (sensory vs. motor), the distance to the target organ, and the complexity of the muscle groups it innervates. **1. Why Radial Nerve is the Correct Answer:** The **Radial nerve** has the best prognosis for recovery after repair among all major peripheral nerves. This is primarily because it is a **predominantly motor nerve** that supplies large, bulky muscles (extensors of the forearm) which perform relatively simple, gross movements. Unlike the small intrinsic muscles of the hand, these large muscles do not require highly refined re-innervation to function effectively. Additionally, the radial nerve has a high proportion of motor fibers, reducing the chance of "mismatched" axonal regrowth during regeneration. **2. Why the Other Options are Incorrect:** * **Median and Ulnar Nerves:** These nerves have a poorer prognosis compared to the radial nerve because they supply the **intrinsic muscles of the hand**. These muscles are responsible for fine, coordinated movements and are located far from the site of most proximal injuries. By the time axons regenerate to reach these distal muscles, irreversible motor end-plate atrophy often occurs. * **Sciatic Nerve:** This nerve has the **worst prognosis** among the options. It is a very thick nerve with a long distance to travel to the target organs (especially the foot). The sheer distance and the mixed nature of the nerve make complete functional recovery rare. **Clinical Pearls for NEET-PG:** * **Order of recovery (Best to Worst):** Radial > Median > Ulnar > Sciatic. * **Pure nerves** (purely motor or purely sensory) generally heal better than **mixed nerves** due to less axonal "mismatching." * **Nerve Regeneration Rate:** Approximately **1 mm/day** (or 1 inch per month). * The most important factor in nerve repair success is the **age of the patient** (younger patients have better outcomes).

Question 239: What is the name of the wiring technique used for mandibular fractures?

A. Ivy's wiring
B. Risdon wiring (Correct Answer)
C. Gilmer wiring
D. Eyelet wiring

Explanation: **Explanation:** The management of mandibular fractures often involves **Intermaxillary Fixation (IMF)** to stabilize the jaw. **Risdon wiring** is the correct answer because it is a specific technique used to provide stable anchorage for IMF, particularly in cases where multiple teeth are missing or when additional horizontal stability is required. In this technique, a long wire is passed around the most posterior teeth on both sides and twisted to form a "horizontal cable" or arch wire along the buccal vestibule, to which other wires can be attached. **Analysis of Incorrect Options:** * **Ivy’s wiring:** This is a method of interdental wiring used to stabilize two adjacent teeth. It involves forming a small loop (eyelet) between two teeth to provide an attachment point for maxillomandibular fixation. * **Eyelet wiring:** This is essentially the same as Ivy’s wiring. It is used for temporary stabilization and is not a "full-arch" wiring technique like Risdon. * **Gilmer wiring:** This is the simplest and oldest form of IMF where wires are passed directly around the necks of individual upper and lower teeth and then twisted together. Its main disadvantage is that the mouth cannot be opened in an emergency without cutting the wires. **Clinical Pearls for NEET-PG:** * **Most common site of Mandibular fracture:** Condyle (followed by the Angle and Symphysis). * **Champy’s Line:** The ideal line of osteosynthesis for placing mini-plates in mandibular fractures (along the line of tension). * **Guardsman Fracture:** A midline symphysis fracture combined with bilateral condylar fractures, often caused by a blow to the chin. * **First-line investigation:** Orthopantomogram (OPG). For the symphysis/parasymphysis, a **Lower Occlusal View** is preferred.

Question 240: Which of the following causes maximum bleeding?

A. Partial arterial severing
B. Complete arterial severing
C. Artery caught between fractured ends of bones (Correct Answer)
D. Intimal tear

Explanation: ### Explanation The amount of bleeding from an arterial injury depends primarily on the vessel's ability to undergo **vasospasm and retraction**. **Why Option C is Correct:** When an artery is caught between fractured bone ends, it is held **distended and patent**. The mechanical entrapment prevents the vessel from retracting into the surrounding soft tissues and prevents the muscular wall from contracting (vasospasm). This keeps the lumen wide open, leading to continuous, profuse, and often fatal hemorrhage. **Analysis of Incorrect Options:** * **B. Complete arterial severing:** Contrary to intuition, a completely transected artery often bleeds less than a partially injured one. The severed ends can retract into the sheath and undergo intense circumferential vasospasm, which facilitates clot formation and natural hemostasis. * **A. Partial arterial severing:** In a partial tear (e.g., a longitudinal or transverse nick), the intact portion of the arterial wall prevents the vessel from retracting or contracting fully. While this bleeds more than a complete transection, it typically bleeds less than an artery held open by bone fragments. * **D. Intimal tear:** This involves an internal injury to the vessel lining. While it is highly dangerous because it leads to **thrombosis and distal ischemia**, it rarely causes significant external or cavitary bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **The "Retraction Principle":** A completely severed artery is safer than a partially torn one because retraction is the body's primary defense against exsanguination. * **Fracture Association:** Brachial artery injuries are most common with supracondylar fractures of the humerus, while Popliteal artery injuries are common with knee dislocations or distal femur fractures. * **Management:** In trauma, the priority is always "Control the Bleed" (Pressure > Tourniquet) followed by restoring distal perfusion.

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