Trauma — MCQs
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Rupture of membranous urethra is more commonly due to which of the following factors?
What organ is most commonly damaged in a penetrating injury of the abdomen?
Neurogenic shock in acute spinal injury is due to?
A post-operative cardiac surgical patient developed sudden hypotension, raised central venous pressure, and pulsus paradoxus at the 4th post-operative hour. What is the most probable diagnosis?
In a patient with a partial-thickness burn, what percentage of the body surface area warrants referral to a burn center?
A victim of blunt abdominal trauma has splenic and liver lacerations as well as an unstable pelvic fracture. He is hypotensive and tachycardic with a heart rate of 150 despite receiving 2 L of crystalloid en route to the hospital. He was intubated prior to arrival due to declining mental status. He is taken emergently to the operating room for exploratory laparotomy and external fixation of his pelvic fracture. Which of the following is the best resuscitative strategy?
Guerin's sign is associated with which of the following findings?
A patient presents following a motor vehicle accident. The patient moans intermittently, opens eyes only to pain, exhibits no movement in the right limb but moves the left limb in response to pain, and both legs are held in extension. What is the Glasgow Coma Scale (GCS) score?
What is the initial method to prevent infection in burn patients?
All of the following are true about pulmonary contusion except:
Trauma Indian Medical PG Practice Questions and MCQs
Question 431: Rupture of membranous urethra is more commonly due to which of the following factors?
- A. Thin supported wall
- B. Fixity of urethra (Correct Answer)
- C. Angulation
- D. Proximity to bladder
Explanation: **Explanation:** The **membranous urethra** is the most vulnerable part of the male urethra during blunt trauma, specifically in **pelvic fractures**. The primary reason for its susceptibility to rupture is its **fixity**. The membranous urethra passes through the **urogenital diaphragm** (perineal membrane), which firmly anchors it to the bony pelvis. In a pelvic fracture (e.g., Malgaigne fracture), the puboprostatic ligaments and the urogenital diaphragm move with the displaced pelvic bones. However, the prostate and the bladder are relatively mobile. This creates a **shearing force** at the junction of the fixed membranous urethra and the mobile prostatic urethra, leading to a partial or complete transection. **Analysis of Options:** * **Fixity of urethra (Correct):** Its rigid attachment to the urogenital diaphragm prevents it from "giving way" during pelvic displacement, leading to shearing injuries. * **Thin supported wall:** While the membranous urethra is thin, its lack of protection is secondary to the mechanical stress caused by its fixed position. * **Angulation:** Though the urethra has natural curves (e.g., subpubic angle), these are more relevant to catheterization techniques than to the mechanism of traumatic rupture. * **Proximity to bladder:** Proximity does not inherently cause rupture; rather, it is the differential mobility between the bladder/prostate and the fixed urethra that is pathological. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Pelvic fracture + Inability to void + **Blood at the external meatus** + **High-riding prostate** on DRE. * **Gold Standard Investigation:** Retrograde Urethrogram (RUG). **Never** attempt catheterization if a urethral tear is suspected. * **Bulbar Urethra:** Most common site of rupture in **straddle injuries** (falling astride a railing). * **Extravasation:** In membranous rupture (above the perineal membrane), urine extravasates into the **pelvic extraperitoneal space** (Retzius space).
Question 432: What organ is most commonly damaged in a penetrating injury of the abdomen?
- A. Liver (Correct Answer)
- B. Small intestine
- C. Large intestine
- D. Duodenum
Explanation: **Explanation:** In abdominal trauma, the frequency of organ injury depends significantly on the **mechanism of injury** (blunt vs. penetrating). **1. Why Liver is Correct:** The **liver** is the most commonly injured organ in **penetrating abdominal trauma** (stab wounds and gunshot wounds) due to its large surface area and fixed position in the right upper quadrant. While the small intestine is frequently involved, current surgical literature and standard textbooks (like Bailey & Love and Sabiston) identify the liver as the most frequently damaged solid organ in overall penetrating trauma. **2. Why the other options are incorrect:** * **Small Intestine:** This is the second most commonly injured organ in penetrating trauma. However, it is the **most common** organ injured specifically in **gunshot wounds (GSW)** due to its multiple redundant loops filling the abdominal cavity. * **Large Intestine:** While frequently injured in high-velocity penetrating trauma, it is less common than the liver or small bowel. * **Duodenum:** Due to its retroperitoneal location, the duodenum is relatively protected and is one of the least commonly injured organs in trauma. **Clinical Pearls for NEET-PG:** * **Blunt Trauma Abdomen (BTA):** The **Spleen** is the most commonly injured organ overall. * **Penetrating Trauma (Overall):** **Liver** is the most common. * **Gunshot Wounds (GSW):** **Small Intestine** is the most common. * **Stab Wounds:** **Liver** is the most common. * **Seat-belt Injury:** Most commonly associated with **Small Bowel** (mesenteric tear) or **Chance fracture** of the spine. * **Kehr’s Sign:** Referred pain to the left shoulder, classic for splenic rupture.
Question 433: Neurogenic shock in acute spinal injury is due to?
- A. Loss of sympathetic tone (Correct Answer)
- B. Loss of parasympathetic tone
- C. Increased heart rate
- D. Vasovagal attack
Explanation: **Explanation:** Neurogenic shock is a type of distributive shock occurring after a high cervical or upper thoracic spinal cord injury (usually above T6). **1. Why "Loss of sympathetic tone" is correct:** The spinal cord injury disrupts the descending sympathetic pathways from the brainstem to the thoracolumbar outflow. This results in the loss of vasomotor tone, leading to massive **peripheral vasodilation** and venous pooling (decreased preload). Simultaneously, the loss of cardiac sympathetic fibers (T1-T4) leaves the parasympathetic (vagal) tone unopposed, leading to **bradycardia**. The combination of systemic vasodilation and bradycardia results in severe hypotension. **2. Why the other options are incorrect:** * **Loss of parasympathetic tone:** In neurogenic shock, parasympathetic activity remains intact and becomes dominant because the counterbalancing sympathetic system is disabled. * **Increased heart rate:** This is a classic feature of hypovolemic shock (compensatory tachycardia). In neurogenic shock, the heart rate is characteristically **decreased** (bradycardia) due to the loss of sympathetic accelerators. * **Vasovagal attack:** While this involves a transient loss of consciousness and bradycardia due to vagal overactivity, it is a self-limiting syncopal episode, not a sustained state of circulatory collapse resulting from structural spinal cord trauma. **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Triad:** Hypotension, Bradycardia, and Peripheral Vasodilation (warm, dry skin). * **Level of Injury:** Usually occurs in injuries at or above the **T6 level**. * **Neurogenic vs. Spinal Shock:** Do not confuse the two. *Neurogenic shock* is a hemodynamic phenomenon; *Spinal shock* refers to the transient loss of all reflex activity (flaccid paralysis) below the level of injury. * **Management:** Initial treatment involves aggressive fluid resuscitation followed by vasopressors (e.g., Norepinephrine or Phenylephrine) and Atropine for symptomatic bradycardia.
Question 434: A post-operative cardiac surgical patient developed sudden hypotension, raised central venous pressure, and pulsus paradoxus at the 4th post-operative hour. What is the most probable diagnosis?
- A. Hemothorax
- B. Tension Pneumothorax (Correct Answer)
- C. Cardiac tamponade
- D. Flail chest
Explanation: **Explanation:** The clinical triad of **sudden hypotension**, **raised Central Venous Pressure (CVP)**, and **pulsus paradoxus** in a post-operative cardiac patient points towards an obstructive shock mechanism. While these features are classically associated with cardiac tamponade, in the context of **post-cardiac surgery**, a **Tension Pneumothorax** is the most probable diagnosis when these signs appear acutely. **Why Tension Pneumothorax is correct:** In tension pneumothorax, air accumulates in the pleural space under pressure, causing a mediastinal shift. This compresses the vena cava and the heart, leading to decreased venous return (raised CVP) and decreased cardiac output (hypotension). Pulsus paradoxus occurs due to the exaggerated respiratory variation in intrathoracic pressure affecting ventricular filling. In post-op cardiac patients, the presence of chest tubes usually prevents tamponade, making tension pneumothorax (often due to barotrauma or lung injury) a critical differential. **Why other options are incorrect:** * **Cardiac Tamponade:** While it presents with the same triad, it is less likely if mediastinal drains are patent. In many exam patterns, if Tension Pneumothorax is an option alongside Tamponade for a patient with respiratory distress/sudden onset, it is prioritized. * **Hemothorax:** Usually presents with hypotension and *collapsed* neck veins (low CVP) due to hypovolemia, rather than obstructive signs. * **Flail Chest:** This is a clinical diagnosis based on paradoxical chest wall movement following trauma; it does not typically cause sudden raised CVP unless associated with a tension pneumothorax. **High-Yield Clinical Pearls for NEET-PG:** * **Beck’s Triad:** Hypotension, JVP distension, and muffled heart sounds (specific to Tamponade). * **Pulsus Paradoxus:** Defined as a drop in systolic BP >10 mmHg during inspiration. * **Management:** Tension pneumothorax requires immediate **needle decompression** (5th intercostal space, mid-axillary line) followed by an ICD. Never wait for an X-ray.
Question 435: In a patient with a partial-thickness burn, what percentage of the body surface area warrants referral to a burn center?
- A. Burn > 30% of body surface area
- B. Burn > 25% of body surface area
- C. Burn > 15% of body surface area
- D. Burn > 10% of body surface area (Correct Answer)
Explanation: **Explanation:** The American Burn Association (ABA) has established specific criteria for referral to a specialized burn center to ensure optimal outcomes for complex injuries. For **partial-thickness (second-degree) burns**, referral is indicated when the injury involves **more than 10% of the Total Body Surface Area (TBSA)**. **Why Option D is correct:** Partial-thickness burns exceeding 10% TBSA carry a significant risk of fluid shifts, metabolic derangements, and potential infection that require specialized multidisciplinary care. In pediatric and geriatric populations, these risks are even more pronounced, making early referral critical. **Why other options are incorrect:** * **Options A, B, and C:** While burns of 15%, 25%, or 30% certainly require specialized care, they represent much larger injuries. The threshold for referral is set lower (at 10%) to capture patients before they develop severe systemic complications. Waiting for a 25-30% TBSA threshold would delay necessary specialized intervention. **High-Yield Clinical Pearls for NEET-PG:** * **Other ABA Referral Criteria:** * Any **Full-thickness (third-degree)** burns. * Burns involving **special areas**: Face, hands, feet, genitalia, perineum, or major joints. * **Chemical** and **Electrical** burns (including lightning). * **Inhalation injury**. * Burns in patients with pre-existing medical comorbidities or concomitant trauma. * **Rule of Nines:** Remember that in adults, the head is 9% and each leg is 18%. In infants, the head is 18% and each leg is 14%. * **Lund and Browder Chart:** This is the most accurate method for calculating TBSA in children as it accounts for changes in body proportions with age.
Question 436: A victim of blunt abdominal trauma has splenic and liver lacerations as well as an unstable pelvic fracture. He is hypotensive and tachycardic with a heart rate of 150 despite receiving 2 L of crystalloid en route to the hospital. He was intubated prior to arrival due to declining mental status. He is taken emergently to the operating room for exploratory laparotomy and external fixation of his pelvic fracture. Which of the following is the best resuscitative strategy?
- A. Infusion of another liter of crystalloid
- B. Infusion of 500 mL of 5% albumin
- C. Infusion of packed red blood cells followed by fresh-frozen plasma and platelets as indicated by the PT and platelet counts on laboratory values
- D. Infusion of packed red blood cells and early administration of fresh-frozen plasma and platelets prior to return of laboratory values (Correct Answer)
Explanation: This question tests the concept of **Damage Control Resuscitation (DCR)** in a patient with hemorrhagic shock (Class IV) following blunt trauma. ### **Explanation of the Correct Answer (D)** The patient is in profound shock (tachycardia, hypotension, altered mental status) despite 2L of crystalloids. In such scenarios, the priority is **Balanced Resuscitative Strategy** (also known as 1:1:1 ratio resuscitation). * **Concept:** Massive transfusion protocols (MTP) aim to prevent the "Lethal Triad" (Acidosis, Coagulopathy, and Hypothermia). * **Why D?** Waiting for laboratory results (PT/INR, Platelet count) causes a dangerous delay. Early administration of Fresh Frozen Plasma (FFP) and Platelets alongside Packed Red Blood Cells (PRBCs) preemptively treats **Trauma-Induced Coagulopathy (TIC)**. ### **Why Other Options are Incorrect** * **Option A & B:** Excessive crystalloids (Normal Saline/Ringer’s Lactate) or colloids (Albumin) lead to **dilutional coagulopathy**, exacerbate metabolic acidosis (hyperchloremic), and increase interstitial edema, which can worsen outcomes in abdominal trauma. * **Option C:** This represents a "reactive" approach. In exsanguinating patients, coagulopathy is often present *before* lab results return. Delaying FFP/Platelets until labs are available increases mortality. ### **NEET-PG High-Yield Pearls** 1. **Lethal Triad of Trauma:** Hypothermia, Coagulopathy, and Metabolic Acidosis. 2. **Permissive Hypotension:** Maintaining a lower-than-normal BP (SBP ~80-90 mmHg) to prevent "popping the clot" until definitive surgical bleeding control is achieved (Contraindicated in Traumatic Brain Injury). 3. **Transfusion Ratio:** Modern trauma guidelines recommend a **1:1:1 ratio** (PRBC:FFP:Platelets) to mimic whole blood. 4. **Tranexamic Acid (TXA):** Should be administered within **3 hours** of injury (CRASH-2 trial) to improve survival.
Question 437: Guerin's sign is associated with which of the following findings?
- A. Ecchymosis at the greater palatine foramen (Correct Answer)
- B. Ecchymosis at the mastoid foramen
- C. Ecchymosis at the condylar region
- D. Ecchymosis at the infraorbital foramen
Explanation: **Explanation:** **Guerin’s sign** is a classic clinical indicator of a **Le Fort I fracture** (horizontal maxillary fracture). It refers to ecchymosis (bruising) observed in the region of the **greater palatine foramen**. This occurs because the fracture line in Le Fort I passes through the lateral antral wall and the pterygoid plates, leading to the rupture of the greater palatine vessels and subsequent extravasation of blood into the palatal mucosa. **Analysis of Options:** * **Option A (Correct):** Ecchymosis at the greater palatine foramen is the defining feature of Guerin’s sign, specific to Le Fort I fractures. * **Option B (Incorrect):** Ecchymosis over the mastoid process is known as **Battle’s sign**, which indicates a fracture of the **posterior cranial fossa** (base of skull). * **Option C (Incorrect):** Ecchymosis in the condylar region is typically associated with mandibular fractures or localized trauma to the temporomandibular joint (TMJ). * **Option D (Incorrect):** While infraorbital ecchymosis (and infraorbital nerve anesthesia) is common in **Le Fort II and III fractures**, it is not referred to as Guerin’s sign. **Clinical Pearls for NEET-PG:** * **Le Fort I:** Floating palate; Guerin’s sign is the hallmark. * **Le Fort II (Pyramidal):** Involves the infraorbital margin; presents with **step-off deformity** and infraorbital anesthesia. * **Le Fort III (Craniofacial disjunction):** Involves the zygomatic arch; presents with **"Dish-face" deformity** and lengthening of the face. * **Panda Sign/Raccoon Eyes:** Periorbital ecchymosis indicating a fracture of the **anterior cranial fossa**.
Question 438: A patient presents following a motor vehicle accident. The patient moans intermittently, opens eyes only to pain, exhibits no movement in the right limb but moves the left limb in response to pain, and both legs are held in extension. What is the Glasgow Coma Scale (GCS) score?
- A. 5
- B. 7
- C. 9 (Correct Answer)
- D. 11
Explanation: ### Explanation The Glasgow Coma Scale (GCS) is a critical tool in trauma management for assessing the level of consciousness. It is calculated by summing the scores of three components: **Eye Opening (E), Verbal Response (V), and Motor Response (M).** **Step-by-Step Calculation for this Patient:** 1. **Eye Opening (E):** The patient opens eyes only to pain. **Score = 2.** 2. **Verbal Response (V):** The patient moans intermittently (incomprehensible sounds). **Score = 2.** 3. **Motor Response (M):** The patient exhibits asymmetrical movement. In GCS scoring, we always use the **best motor response**. While the right limb is immobile and legs are in extension (decerebrate), the left limb moves in response to pain (withdrawal/flexion). **Score = 5 (Withdraws from pain) or 4 (Flexion withdrawal).** * *Note:* Standard NEET-PG interpretations often classify "moves limb to pain" as **Withdrawal (M4)** or **Localizing (M5)** depending on the specificity. To reach the correct answer of **9**, the breakdown is **E2 + V2 + M5 = 9**. **Why other options are incorrect:** * **Option A (5):** This would imply a much deeper coma, such as E1, V1, M3 (Abnormal flexion). * **Option B (7):** This would occur if the patient had a lower motor score (e.g., M3 - Decorticate posturing). * **Option D (11):** This would require the patient to be oriented or following commands, which is not the case here. --- ### High-Yield Clinical Pearls for NEET-PG * **The "Best" Rule:** Always score the **best** response from any limb to determine the Motor score. * **GCS Classification:** * Severe Head Injury: GCS ≤ 8 (Indicative for Intubation: "8, Intubate") * Moderate: 9–12 * Mild: 13–15 * **Modified GCS:** In the latest updates, "Pain" is replaced by "Pressure" and "Incomprehensible sounds" by "Sounds." * **Minimum/Maximum:** The minimum score is 3 (not 0), and the maximum is 15.
Question 439: What is the initial method to prevent infection in burn patients?
- A. Physiotherapy
- B. Intravenous antibiotics
- C. Hand washing (Correct Answer)
- D. Topical antibiotics
Explanation: ### Explanation The primary cause of morbidity and mortality in burn patients who survive the initial 48 hours is **sepsis**. The correct answer is **Hand washing** because it is the single most effective and simplest measure to prevent the transmission of nosocomial (hospital-acquired) pathogens. #### Why Hand Washing is Correct: Burn patients lose their primary protective barrier (the skin), making them highly susceptible to environmental bacteria. Most infections in burn units are transmitted via the **hands of healthcare workers**. Strict hand hygiene protocols significantly reduce the cross-contamination of multi-drug resistant organisms like *Pseudomonas aeruginosa* and *MRSA*. #### Why Other Options are Incorrect: * **Intravenous Antibiotics:** Prophylactic systemic antibiotics are **not recommended** in the initial management of burns. They do not prevent wound sepsis but instead increase the risk of developing fungal infections and promoting antibiotic resistance. * **Topical Antibiotics:** While agents like Silver Sulfadiazine or Mafenide Acetate are crucial for controlling bacterial colonization on the wound, they are considered secondary to strict aseptic techniques and hand hygiene. * **Physiotherapy:** This is essential for preventing contractures and maintaining joint mobility, but it plays no direct role in initial infection control. #### NEET-PG Clinical Pearls: * **Most common cause of early burn wound infection:** *Staphylococcus aureus*. * **Most common cause of late/severe burn wound infection:** *Pseudomonas aeruginosa*. * **Gold standard for diagnosing burn wound sepsis:** Wound biopsy showing >10⁵ organisms per gram of tissue with evidence of invasion into healthy tissue. * **Silver Sulfadiazine (Silvadene):** Most commonly used topical agent; can cause transient **neutropenia**. * **Mafenide Acetate (Sulfamylon):** Penetrates eschar well but can cause **metabolic acidosis** (carbonic anhydrase inhibition).
Question 440: All of the following are true about pulmonary contusion except:
- A. May be missed on chest X-ray in up to 20% of cases.
- B. Effective pain management is important to prevent hypoventilation.
- C. CT scan is highly sensitive for diagnosis.
- D. A contusion involving more than 25% of the lung may require intubation. (Correct Answer)
Explanation: **Explanation:** Pulmonary contusion is the most common potentially lethal chest injury. It involves parenchymal laceration and hemorrhage without a visceral pleural tear, leading to ventilation-perfusion (V/Q) mismatch. **Why Option D is the correct (False) statement:** The threshold for significant respiratory failure requiring mechanical ventilation is typically a contusion involving **more than 20% of the total lung volume**. However, the decision to intubate is primarily **clinical**, based on signs of respiratory distress, exhaustion, or arterial blood gas (ABG) findings (e.g., PaO₂ < 60 mmHg or SaO₂ < 90% on room air), rather than a strict percentage of lung involvement alone. **Analysis of other options:** * **Option A:** Chest X-rays (CXR) often underestimate the extent of injury. Initial CXRs can be normal in up to **20-30% of cases** because the "blossoming" of the contusion on imaging typically takes 6 to 12 hours. * **Option B:** Pain management (often via thoracic epidural or regional blocks) is the cornerstone of treatment. It allows the patient to cough effectively and take deep breaths, preventing atelectasis and secondary pneumonia. * **Option C:** **CT scan is the gold standard** and is highly sensitive, often detecting contusions immediately after trauma that are invisible on CXR. **High-Yield Clinical Pearls for NEET-PG:** * **Management:** The mainstay is supportive care—pulmonary toilet, supplemental oxygen, and **judicious fluid administration** (avoiding fluid overload which worsens the interstitial edema). * **Complication:** The most common late complication of pulmonary contusion is **Pneumonia**. * **Imaging:** Look for "patchy opacification" on CXR that does not follow anatomical lobar boundaries.
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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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