Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 191: Which of the following structures remains intact in a closed head injury?

A. Scalp
B. Skull
C. Dura mater (Correct Answer)
D. Arachnoid mater

Explanation: In neurosurgery and trauma management, the classification of head injuries is primarily based on the integrity of the **Dura Mater**. ### **Why Dura Mater is the Correct Answer** A **closed head injury** is defined as a traumatic brain injury where the **dura mater remains intact**. Even if there are extensive fractures of the skull or severe underlying brain parenchymal damage (like contusions or diffuse axonal injury), the injury is classified as "closed" as long as the protective dural barrier is not breached. This is a critical distinction because an intact dura prevents direct communication between the external environment and the cerebrospinal fluid (CSF), significantly reducing the risk of meningitis and intracranial sepsis. ### **Analysis of Incorrect Options** * **A. Scalp & B. Skull:** In a closed head injury, the scalp may have lacerations and the skull may have displaced or non-displaced fractures. The presence of a skull fracture does not automatically make an injury "open." * **D. Arachnoid Mater:** The arachnoid mater is deep to the dura. If the dura mater is breached (making it an open injury), the arachnoid is almost always breached as well. However, the defining anatomical boundary for the classification is the dura. ### **High-Yield Clinical Pearls for NEET-PG** * **Open Head Injury:** Defined by a breach in the dura mater. Clinical signs include CSF rhinorrhea, CSF otorrhea, or brain tissue herniating through a wound. * **Compound Fracture:** A skull fracture associated with an overlying scalp laceration. If the dura is torn underneath, it becomes an open head injury. * **The "Dural Barrier":** The dura is the toughest layer of the meninges (pachymeninx). Its integrity is the single most important factor in preventing post-traumatic intracranial infection.

Question 192: Which type of shock is typically seen in patients with severe burns?

A. Cardiogenic shock
B. Hypovolemic shock (Correct Answer)
C. Both cardiogenic and hypovolemic shock
D. None of the above

Explanation: **Explanation:** In severe burns, the primary mechanism of shock is **Hypovolemic Shock**, specifically a sub-type often referred to as "Burn Shock." **Why Hypovolemic Shock is Correct:** The pathophysiology involves a massive systemic inflammatory response leading to increased capillary permeability. This causes a rapid shift of fluid, electrolytes, and plasma proteins from the intravascular compartment into the interstitial space (edema). Additionally, the loss of the skin barrier leads to significant evaporative fluid loss. This results in decreased circulating blood volume, reduced cardiac output, and tissue hypoperfusion. **Analysis of Incorrect Options:** * **Cardiogenic Shock:** This occurs due to primary pump failure (e.g., Myocardial Infarction). While severe burns can cause secondary myocardial depression due to circulating inflammatory cytokines (like TNF-α), the initiating and predominant cause of shock is fluid loss, not primary heart failure. * **Both Cardiogenic and Hypovolemic:** While there is a cardiac depressive component in the late stages of burn shock, the standard clinical classification and the immediate life-threatening priority in burn management is the hypovolemic component. For NEET-PG purposes, hypovolemia is the definitive answer. **High-Yield Clinical Pearls for NEET-PG:** * **Parkland Formula:** The gold standard for fluid resuscitation in the first 24 hours is **4 mL × Body Weight (kg) × % TBSA** (Total Body Surface Area) of Ringer’s Lactate. * **Fluid of Choice:** Crystalloids, specifically **Ringer’s Lactate**, are preferred because they help combat the metabolic acidosis often seen in burn patients. * **Rule of Nines:** Used to quickly estimate TBSA; remember that only 2nd and 3rd-degree burns are included in the calculation. * **Indicator of Resuscitation:** The most reliable indicator of adequate fluid resuscitation is **Urinary Output** (Target: 0.5–1.0 mL/kg/hr in adults).

Question 193: Which of the following statements is true regarding esophageal injury?

A. Most common after penetrating injury
B. Can lead to mediastinal collection
C. Barium swallow is diagnostic
D. All of the above (Correct Answer)

Explanation: **Explanation:** Esophageal injury is a surgical emergency with high morbidity due to its lack of a serosal layer, which allows infection to spread rapidly into the mediastinum. * **Option A (Most common after penetrating injury):** In the context of **trauma**, the esophagus is most frequently injured by penetrating mechanisms (stab or gunshot wounds), particularly in the cervical region. While iatrogenic injury (endoscopy) is the most common cause of esophageal perforation *overall*, penetrating trauma remains the primary cause in a trauma setting. * **Option B (Can lead to mediastinal collection):** The esophagus is located in the posterior mediastinum. Perforation leads to the leakage of saliva, gastric acid, and bacteria, causing **mediastinitis**. This often manifests as mediastinal collections, abscesses, or pleural effusions (usually on the left side). * **Option C (Barium swallow is diagnostic):** Contrast esophagography is the gold standard for diagnosis. While **Gastrografin** (water-soluble) is typically used first to avoid barium-induced granulomas, **Barium** is more sensitive for detecting small leaks and is used if the Gastrografin study is negative but clinical suspicion remains high. **High-Yield Clinical Pearls for NEET-PG:** * **Mackler’s Triad:** Vomiting, chest pain, and subcutaneous emphysema (classic for Boerhaave Syndrome). * **Most common site of injury:** Cervical esophagus (trauma); Left posterolateral aspect 2-3 cm above the GE junction (Boerhaave). * **Chest X-ray findings:** Pneumomediastinum, "V sign of Naclerio," or pleural effusion. * **Management:** If diagnosed within 24 hours, primary surgical repair is preferred. Beyond 24 hours, diversion or esophagostomy may be required due to tissue friability.

Question 194: From the following list, choose the appropriate order of priorities in the management of a patient with polytrauma: 1. Control of external haemorrhage 2. Intravenous infusion and transfusion 3. Maintenance of patent airway 4. Relief of a tension pneumothorax 5. Splinting of fractures.

A. 3,4,1,2,5
B. 3,4,1,2,5 (Correct Answer)
C. 4,1,5,3,2
D. 2,1,5,3,4

Explanation: The management of a polytrauma patient follows the standardized **ATLS (Advanced Trauma Life Support)** protocol, which prioritizes life-threatening conditions in a specific sequence: **ABCDE** (Airway, Breathing, Circulation, Disability, Exposure). ### 1. Why Option B (3,4,1,2,5) is Correct: The sequence follows the hierarchy of "what kills the patient first": * **3 (Airway):** Maintenance of a patent airway is the absolute first priority. Without oxygenation, brain death occurs within minutes. * **4 (Breathing):** Relief of a **tension pneumothorax** is the next priority. Even with a clear airway, a tension pneumothorax prevents ventilation and causes obstructive shock. * **1 & 2 (Circulation):** Control of external hemorrhage (1) must precede or occur simultaneously with fluid resuscitation (2). Giving IV fluids while a major vessel is still bleeding is ineffective ("filling a leaky bucket"). * **5 (Fractures):** Splinting of fractures is part of the secondary survey or the end of the primary survey (adjuncts), as it is rarely immediately life-threatening compared to airway or tension pneumothorax. ### 2. Why Other Options are Incorrect: * **Options C and D:** These are incorrect because they place circulation (2) or breathing (4) before the airway (3). In trauma, the "A" always precedes "B" and "C." * **Note on Option A vs B:** Both are identical in your list; however, any sequence that deviates from the **3-4-1-2-5** order fails to address the physiological urgency of hypoxia over hypovolemia. ### 3. Clinical Pearls for NEET-PG: * **The "Golden Hour":** The critical period where prompt intervention significantly reduces mortality. * **Tension Pneumothorax:** Diagnosis is **clinical** (distended neck veins, tracheal shift, absent breath sounds). Do NOT wait for an X-ray; perform immediate needle decompression (5th intercostal space, mid-axillary line). * **Circulation:** Two large-bore IV cannulas (14G or 16G) are the standard for initial resuscitation. * **Lethal Triad of Trauma:** Acidosis, Coagulopathy, and Hypothermia. Management aims to prevent this cycle.

Question 195: What is the treatment of choice for a gunshot injury?

A. Primary suture only
B. Debridement (Correct Answer)
C. Debridement and primary suture
D. Debridement and secondary suture

Explanation: **Explanation:** The treatment of choice for a gunshot injury is **thorough debridement**. Gunshot wounds are classified as high-energy trauma characterized by "cavitation." As a projectile passes through tissue, it creates a temporary pulsating cavity that sucks in debris, clothing, and bacteria, leading to extensive "zone of injury" beyond the visible track. **Why Debridement is the Correct Answer:** The primary goal in managing ballistic trauma is the removal of devitalized tissue, foreign bodies, and contaminants. Debridement (specifically "wound excision") converts a contaminated, ragged wound into a clean one, preventing necrotizing infections and gas gangrene. In surgical priority, stabilizing the wound bed through debridement always precedes closure. **Analysis of Incorrect Options:** * **A. Primary suture only:** This is contraindicated. Closing a gunshot wound primarily traps contaminants and anaerobic bacteria in deep tissues, leading to abscess formation or sepsis. * **C. Debridement and primary suture:** Even after debridement, gunshot wounds are considered "dirty/infected." Primary closure carries a high risk of wound dehiscence and infection due to delayed tissue necrosis (the "wait and see" zone). * **D. Debridement and secondary suture:** While this is a common management strategy (Delayed Primary Closure), the **initial and most critical step** (treatment of choice) remains the debridement itself. **NEET-PG High-Yield Pearls:** * **Cavitation Effect:** Proportional to the velocity of the bullet ($KE = \frac{1}{2}mv^2$). High-velocity bullets (>600-750 m/s) cause massive tissue disruption. * **Management Rule:** "Leave the bullet, treat the track." Unless the bullet is intra-articular, in a vessel, or easily accessible, searching for it is secondary to debridement. * **Antibiotics:** Always administer Tetanus prophylaxis and broad-spectrum antibiotics (covering Gram-positives and anaerobes).

Question 196: What is the safest strategy for treating a patient with an inhalational burn injury who presents within 4-5 hours?

A. Binasal catheter oxygen inhalation
B. Oxygen therapy with a well-fitting face mask
C. Elective cricothyroidotomy
D. Elective endotracheal intubation (Correct Answer)

Explanation: **Explanation:** Inhalational burn injuries are dynamic and life-threatening. The primary concern is **progressive upper airway edema**, which can lead to complete airway obstruction within 24 hours, even if the patient appears stable initially. **Why Option D is Correct:** **Elective endotracheal intubation** is the safest strategy because it secures the airway *before* the onset of massive edema. Once laryngeal edema develops, intubation becomes technically difficult or impossible, often necessitating a risky emergency surgical airway. Proactive management is indicated if there are signs of airway involvement (e.g., singed nasal hair, carbonaceous sputum, or oropharyngeal burns). **Why Other Options are Incorrect:** * **Options A & B:** While supplemental oxygen is necessary, nasal catheters and face masks do not protect the airway from mechanical obstruction caused by swelling. Relying on these in a patient with significant inhalational risk is dangerous "watchful waiting." * **Option C:** Cricothyroidotomy is a rescue procedure for a "cannot intubate, cannot ventilate" scenario. It is not an elective first-line treatment. Elective intubation is less invasive and carries fewer long-term complications (like subglottic stenosis). **Clinical Pearls for NEET-PG:** * **Gold Standard for Diagnosis:** Fiberoptic bronchoscopy (to visualize soot, edema, or mucosal ulceration). * **Classic Indicators:** Singed nasal hair, soot in the oral cavity, hoarseness of voice, and history of fire in an enclosed space. * **Carbon Monoxide (CO) Poisoning:** Always suspect CO poisoning in inhalational burns; treat with 100% humidified oxygen (reduces CO half-life from 4 hours to 40-60 minutes). * **Rule of Thumb:** If in doubt about the airway in a burn patient, **intubate early.**

Question 197: What percentage of burn surface area is equal to the palmar surface?

A. 2%
B. 9%
C. 18%
D. 1% (Correct Answer)

Explanation: **Explanation:** The correct answer is **1% (Option D)**. This is based on the **"Rule of Palms,"** a clinical tool used in emergency medicine and burn surgery to estimate the Total Body Surface Area (TBSA) of small, patchy, or irregular burns. **Why 1% is correct:** According to the Rule of Palms, the surface area of a patient’s entire hand (including the palm and the palmar surface of the fingers) is approximately equal to **1% of their total body surface area**. This method is particularly useful for assessing burns that do not follow the distribution of the "Rule of Nines." **Analysis of Incorrect Options:** * **Option A (2%):** This is incorrect. While some older texts debated whether the palm alone (without fingers) was 0.5% or 1%, the standard teaching for NEET-PG remains 1% for the entire palmar surface. * **Option B (9%):** This represents the surface area of one entire upper limb or the head and neck in an adult, according to Wallace’s Rule of Nines. * **Option C (18%):** This represents the surface area of one entire lower limb, the anterior torso, or the posterior torso in an adult. **Clinical Pearls for NEET-PG:** * **Wallace’s Rule of Nines:** Used for large burns. Note that in **pediatric patients**, the head is 18% and each leg is 14% (Lund and Browder chart is more accurate for children). * **First-degree burns:** These (e.g., simple sunburn) are **excluded** from TBSA calculations for fluid resuscitation. * **Parkland Formula:** $4 \text{ ml} \times \text{Body Weight (kg)} \times \% \text{ TBSA}$. Half is given in the first 8 hours, and the remainder over the next 16 hours. * **Critical Area:** The "palm" used for measurement must be the **patient's hand**, not the examiner's.

Question 198: The Rule of 9 in burns is used to denote what?

A. Depth of burns
B. Total body surface area involved (Correct Answer)
C. Severity of burns
D. Type of burns

Explanation: **Explanation:** The **Wallace Rule of Nines** is a standardized clinical tool used in emergency medicine and trauma surgery to estimate the **Total Body Surface Area (TBSA)** affected by partial-thickness (2nd degree) and full-thickness (3rd degree) burns. This estimation is critical because it dictates the volume of fluid resuscitation required (via the Parkland Formula) and determines the necessity of referral to a specialized burn center. **Why Option B is Correct:** The Rule of Nines divides the adult body into anatomical sections representing 9% (or multiples of 9%) of the TBSA: * Head and Neck: 9% * Each Upper Limb: 9% (4.5% anterior, 4.5% posterior) * Each Lower Limb: 18% (9% anterior, 9% posterior) * Anterior Trunk: 18% * Posterior Trunk: 18% * Perineum/Genitalia: 1% **Why Other Options are Incorrect:** * **Depth of burns (A):** Depth is classified as superficial (1st degree), partial-thickness (2nd degree), or full-thickness (3rd degree) based on clinical appearance (blistering, blanching, sensation). * **Severity of burns (C):** Severity is a composite assessment involving TBSA, depth, age of the patient, inhalation injury, and co-morbidities. * **Type of burns (D):** This refers to the mechanism of injury (thermal, chemical, electrical, or radiation). **High-Yield Clinical Pearls for NEET-PG:** 1. **Lund and Browder Chart:** The most accurate method for TBSA estimation in **pediatrics**, as it accounts for the larger head-to-body ratio in children. 2. **Palmar Method:** The patient’s palm (including fingers) represents approximately **1% TBSA**; useful for small or patchy burns. 3. **First-degree burns** (e.g., simple sunburn) are **excluded** from TBSA calculations for fluid resuscitation. 4. **Fluid of Choice:** Ringer’s Lactate is the preferred crystalloid for burn resuscitation.

Question 199: What is the best method to assess the adequacy of fluid replacement in a case of shock?

A. Decrease in thirst
B. Increased PaO2
C. Increase in urine output (Correct Answer)
D. Blood pressure

Explanation: **Explanation:** In the management of shock, the primary goal of fluid resuscitation is to restore **end-organ perfusion**. **Why Urine Output is the Best Indicator:** The kidney is highly sensitive to changes in perfusion pressure and sympathetic nervous system activation. During shock, compensatory mechanisms (RAAS and ADH) cause vasoconstriction and water retention to preserve core volume, leading to oliguria. An **increase in urine output (target: 0.5 ml/kg/hr in adults)** is the most reliable, non-invasive bedside indicator that renal blood flow has been restored and, by extension, that systemic tissue perfusion is becoming adequate. **Analysis of Incorrect Options:** * **Decrease in thirst (A):** Thirst is a subjective symptom influenced by various factors (like dry mouth or medications) and is not a reliable hemodynamic parameter. * **Increased PaO2 (B):** Partial pressure of arterial oxygen reflects pulmonary gas exchange and oxygenation status, not the adequacy of circulating volume or tissue perfusion. * **Blood Pressure (D):** While important, BP is a poor early indicator. Due to compensatory vasoconstriction, BP may remain normal even after a 30% loss of blood volume (compensated shock). Therefore, "normal" BP does not guarantee adequate tissue perfusion. **High-Yield Clinical Pearls for NEET-PG:** * **Target Urine Output:** Adults: 0.5 ml/kg/hr; Children: 1 ml/kg/hr; Infants: 2 ml/kg/hr. * **Best Initial Fluid:** Isotonic Crystalloids (Ringer’s Lactate is preferred in trauma). * **End-points of Resuscitation:** While urine output is the best clinical bedside monitor, **Serum Lactate** and **Base Deficit** are the best biochemical markers for monitoring the resolution of global tissue hypoxia.

Question 200: A man falls from a height, directly hitting his pelvis on the ground, and presents with urinary incontinence. What is the probable injury he sustained?

A. Cervical spine injury
B. Pelvic hematoma (Correct Answer)
C. Blunt injury abdomen
D. Injury to loin region

Explanation: **Explanation:** The clinical presentation of urinary incontinence following a high-impact pelvic trauma is a classic indicator of a **Pelvic Hematoma** causing **Overflow Incontinence**. **Why Pelvic Hematoma is correct:** In high-velocity falls or pelvic fractures, significant retroperitoneal bleeding occurs, leading to a large pelvic hematoma. This hematoma can compress the bladder neck or the posterior urethra. Additionally, the trauma often causes autonomic nerve dysfunction (injury to the pelvic plexus/nervi erigentes). This results in an **atonic bladder** that overfills; once the intravesical pressure exceeds the urethral resistance, the patient experiences "overflow" incontinence. **Why other options are incorrect:** * **Cervical spine injury:** While spinal cord injuries cause bladder dysfunction, a fall directly on the pelvis is more likely to cause local mechanical and neurological damage to the pelvic floor and bladder outlet. * **Blunt injury abdomen:** This typically presents with features of peritonitis (if a hollow viscus is ruptured) or hemoperitoneum (if solid organs like the spleen/liver are injured), rather than isolated urinary incontinence. * **Injury to loin region:** This usually involves renal trauma, presenting with hematuria and flank pain, but does not typically cause immediate incontinence. **High-Yield NEET-PG Pearls:** * **Most common cause of death in pelvic fracture:** Hemorrhage (often from the presacral venous plexus or internal iliac artery). * **Nerve supply:** Parasympathetic nerves (S2-S4) are responsible for bladder contraction; their injury leads to urinary retention and overflow. * **Clinical Sign:** Always look for "High-riding prostate" on DRE in pelvic trauma, which suggests a membranous urethral tear. * **Management:** The first step in stabilizing a suspected pelvic fracture with hematoma is a **Pelvic Binder** or circumferential sheet wrap to reduce pelvic volume and tamponade bleeding.

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