Trauma — MCQs

A teenage boy sustains a severe crush injury after falling from his bicycle and being run over by a truck. On arrival in the emergency room, he is awake and alert, appearing frightened but in no acute distress. A chest radiograph reveals an air-fluid level in the left lower lung field, and the nasogastric tube appears to be coiled upward into the left chest. What is the next best step in management?

Trauma Indian Medical PG Practice Questions and MCQs

Question 621: Physiologic responses to all types of shock include the following except?

A. Activation of the inflammatory system.
B. Activation of the coagulation system.
C. Hypoperfusion of tissues.
D. Vasoconstriction. (Correct Answer)

Explanation: ### Explanation The key to answering this question lies in the phrase **"all types of shock."** While shock is broadly defined as a state of cellular and tissue hypoxia due to reduced oxygen delivery or increased oxygen consumption, the hemodynamic response varies depending on the etiology. **1. Why "Vasoconstriction" is the correct answer:** Vasoconstriction is a hallmark of **hypovolemic, cardiogenic, and obstructive shock** (cold shock), where the body attempts to maintain mean arterial pressure via sympathetic activation. However, in **distributive shock** (e.g., septic, anaphylactic, or neurogenic shock), the primary pathophysiology is **systemic vasodilation** (warm shock) due to the loss of vascular tone or inflammatory mediators. Therefore, vasoconstriction is not a universal response to all types of shock. **2. Why the other options are incorrect:** * **Hypoperfusion of tissues (C):** This is the **defining characteristic** of all shock states. Regardless of the cause, the end result is inadequate oxygen delivery to meet metabolic demands, leading to anaerobic metabolism and lactic acidosis. * **Activation of the inflammatory and coagulation systems (A & B):** Shock triggers a systemic "cytokine storm." Tissue hypoxia and reperfusion injury activate macrophages and neutrophils, releasing pro-inflammatory cytokines (TNF-α, IL-1). Simultaneously, the **coagulation cascade** is activated via tissue factor pathways, often leading to a pro-thrombotic state or Disseminated Intravascular Coagulation (DIC) in severe cases. ### NEET-PG High-Yield Pearls: * **Distributive Shock** is the only type where **Systemic Vascular Resistance (SVR) is decreased** and Cardiac Output (CO) is often initially increased. * **Neurogenic Shock** is unique because it presents with **bradycardia** (due to loss of sympathetic tone), whereas other shocks typically present with tachycardia. * **The "Golden Hour":** Refers to the critical period where prompt fluid resuscitation and source control can prevent the progression from reversible to irreversible shock. * **Lactate levels** are the most reliable indicator of the severity of tissue hypoperfusion and the adequacy of resuscitation.

Question 622: In a third-degree burn, which of the following findings is typically absent?

A. Absence of vesicles
B. Painful sensation (Correct Answer)
C. Leathery appearance of the skin
D. Reddish discoloration due to hemoglobin infiltration

Explanation: In burns, the depth of the injury determines the clinical presentation and the degree of nerve damage. ### **Explanation of the Correct Answer** **B. Painful sensation** is the correct answer because third-degree (full-thickness) burns involve the destruction of the entire epidermis and dermis, extending into the subcutaneous fat. This process destroys the **dermal nerve endings** and sensory receptors. Consequently, the area becomes **anaesthetic** (painless) to touch and pinprick. While the surrounding second-degree areas may be excruciatingly painful, the third-degree site itself lacks sensation. ### **Analysis of Incorrect Options** * **A. Absence of vesicles:** Vesicles (blisters) are characteristic of second-degree (partial-thickness) burns. In third-degree burns, the skin is completely coagulated, so fluid does not accumulate to form blisters. * **C. Leathery appearance:** This is a hallmark of third-degree burns. The skin becomes tough, dry, and inelastic, often referred to as **"eschar."** * **D. Reddish discoloration:** While third-degree burns can be waxy white or charred black, they can also appear dull red. This is not due to capillary refill (which is absent) but due to **hemoglobin fixation** from ruptured red blood cells in the thrombosed dermal vessels. ### **High-Yield NEET-PG Pearls** * **First-degree:** Only epidermis; painful, erythema, no blisters (e.g., sunburn). * **Second-degree (Superficial):** Painful, **blisters present**, brisk capillary refill. * **Second-degree (Deep):** Less painful, white/pink, sluggish refill. * **Third-degree:** **Painless**, leathery eschar, no capillary refill. * **Rule of 9s:** Used for initial assessment of Total Body Surface Area (TBSA). * **Parkland Formula:** $4 \text{ ml} \times \text{kg} \times \% \text{ TBSA}$ (Note: Recent guidelines often suggest $2\text{--}3 \text{ ml}$ for adults, but $4 \text{ ml}$ remains a common exam standard).

Question 623: A 5-year-old child has burns on the body surface equivalent to the size of their palm. What is the estimated percentage of total body surface area affected by the burns?

A. 1% (Correct Answer)
B. 5%
C. 10%
D. 9%

Explanation: **Explanation:** The correct answer is **1%**. This is based on the **"Rule of Palms,"** a clinical tool used to estimate the Total Body Surface Area (TBSA) of small or patchy burns. **1. Why the Correct Answer is Right:** In both pediatric and adult populations, the area of the patient’s **entire palmar surface** (including the palm and the fingers) is approximately equal to **1% of their TBSA**. This method is particularly useful in children because their body proportions differ significantly from adults (e.g., larger heads and smaller limbs), making the "Rule of Nines" less accurate for small, irregular burn areas. **2. Why the Incorrect Options are Wrong:** * **Option B (5%):** This is an overestimation. While 5% might represent a small segment of a limb, it far exceeds the area of a single palm. * **Option C (10%):** In a child, 10% TBSA is a significant burn (roughly equivalent to an entire arm). * **Option D (9%):** This refers to the **"Rule of Nines"** (Wallace’s Rule), where 9% represents the TBSA of a single upper limb or half of a lower limb in an adult. It does not correlate with the size of a palm. **3. Clinical Pearls for NEET-PG:** * **Lund and Browder Chart:** This is the **most accurate** method for calculating TBSA in children as it accounts for age-related changes in body proportions. * **Rule of Nines (Pediatric):** Unlike adults, a child’s **head** accounts for **18%**, while each **leg** accounts for **14%**. * **Fluid Resuscitation:** For children, the **Parkland Formula** (4ml x kg x %TBSA) is used, but **Maintenance Fluids** (using the 4-2-1 rule) must be added separately because children have lower glycogen stores and are prone to hypoglycemia. * **Note:** When using the Rule of Palms, ensure you use the **patient's palm size**, not the examiner's.

Question 624: What is true regarding the presentation(s) of thoracic duct injury?

A. Electrolyte disbalance
B. Lymphedema
C. Lymphopenia (Correct Answer)
D. Dehydration

Explanation: **Explanation:** Thoracic duct injury, often resulting from trauma or iatrogenic causes (e.g., esophagectomy), leads to the leakage of chyle into the pleural space (chylothorax). **Why Lymphopenia is the Correct Answer:** The thoracic duct is the primary conduit for the return of lymph and dietary lipids into the systemic circulation. Crucially, it transports a massive number of **T-lymphocytes** (predominantly CD4+ cells) from the lymphatic system back into the blood. When a persistent leak occurs, these lymphocytes are sequestered in the pleural space or lost via chest tube drainage. This depletion leads to profound **lymphopenia**, which can significantly impair cell-mediated immunity and increase the risk of opportunistic infections. **Analysis of Incorrect Options:** * **A & D (Electrolyte imbalance and Dehydration):** While chyle contains electrolytes similar to plasma, the volume lost is rarely acute or massive enough to cause systemic dehydration or significant electrolyte derangement, provided the patient is receiving maintenance IV fluids. The metabolic hallmark is more often **hypoproteinemia** (loss of albumin) rather than electrolyte shifts. * **B (Lymphedema):** Thoracic duct injury typically presents as an internal leak (chylothorax or chylous ascites). Lymphedema is usually a consequence of peripheral lymphatic obstruction or destruction (e.g., post-mastectomy or filariasis), not a central duct injury. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomy:** The thoracic duct starts at the **Cisterna Chyli (L2)**, enters the thorax through the **aortic hiatus (T12)**, and drains into the junction of the **left internal jugular and subclavian veins**. * **Diagnosis:** Pleural fluid analysis showing **Triglycerides >110 mg/dL** and the presence of **chylomicrons**. * **Management:** Initial treatment is conservative (NPO, **Medium Chain Triglycerides/MCT diet**, or TPN). If drainage exceeds 1-1.5 L/day, surgical ligation or embolization is indicated.

Question 625: Following an injury to the shoulder joint, a baseball catcher developed symptoms including swelling of the right upper extremity, skin atrophy, and vasomotor instability, along with a burning sensation in the involved extremity. What would be the next step in management?

A. Immobilization of the right arm in a cast
B. Avoidance of physical therapy for 3 months
C. Forceful shoulder joint manipulation
D. Prednisone for 2 weeks in resistant cases (Correct Answer)

Explanation: ### Explanation The clinical presentation described—burning pain, swelling, vasomotor instability (temperature/color changes), and skin atrophy following trauma—is characteristic of **Complex Regional Pain Syndrome (CRPS)**, formerly known as Reflex Sympathetic Dystrophy (RSD) or Sudeck’s atrophy. **Why Option D is Correct:** The primary management of CRPS focuses on physical therapy and pain control (NSAIDs, gabapentin). However, in **resistant cases** or those with significant inflammatory features, systemic **corticosteroids (e.g., Prednisone)** are the next step. They help reduce neurogenic inflammation and have been shown to improve functional outcomes and reduce pain during the acute phase. **Why Incorrect Options are Wrong:** * **A & B (Immobilization/Avoiding PT):** These are contraindicated. Prolonged immobilization is a known trigger for CRPS. The cornerstone of treatment is early mobilization and aggressive physical therapy to prevent joint stiffness and further atrophy. * **C (Forceful Manipulation):** Forceful manipulation under anesthesia is dangerous in CRPS patients as it can exacerbate the inflammatory response, worsen the pain, and potentially cause fractures due to underlying patchy osteoporosis (Sudeck’s atrophy). **Clinical Pearls for NEET-PG:** * **Budapest Criteria:** Used for the clinical diagnosis of CRPS (requires presence of sensory, vasomotor, sudomotor, and motor/trophic signs). * **Radiology:** X-rays may show patchy, periarticular osteopenia (Sudeck’s atrophy). * **Triple Phase Bone Scan:** Highly sensitive in the early stages, showing increased periarticular uptake. * **Vitamin C Prophylaxis:** Administering Vitamin C after distal radius fractures has been shown to reduce the incidence of CRPS.

Question 626: What is the most common cause of hypovolemic shock?

A. Hemorrhage (Correct Answer)
B. Decreased RBC formation
C. Bone marrow suppression
D. None of the above

Explanation: ### Explanation **1. Why Hemorrhage is the Correct Answer:** Hypovolemic shock occurs when there is a critical reduction in intravascular volume, leading to decreased preload, reduced cardiac output, and inadequate tissue perfusion. **Hemorrhage (acute blood loss)** is the most common cause of hypovolemic shock, particularly in surgical and trauma settings. It results in the rapid loss of whole blood, depleting both the oxygen-carrying capacity (RBCs) and the circulating plasma volume. In non-traumatic settings, severe dehydration (e.g., vomiting, diarrhea, or third-spacing in burns) is another major cause, but hemorrhage remains the leading etiology globally in emergency medicine. **2. Why Other Options are Incorrect:** * **B. Decreased RBC formation:** This leads to chronic anemia. While anemia reduces the oxygen-carrying capacity of the blood, it does not typically cause an acute drop in total intravascular volume. The body compensates over time, preventing the hemodynamic collapse seen in shock. * **C. Bone marrow suppression:** Similar to decreased formation, this results in cytopenias (anemia, leukopenia, thrombocytopenia). While it may lead to complications like infection (septic shock) or bleeding (due to low platelets), the suppression itself is a hematological failure, not a primary cause of acute hypovolemic shock. **3. Clinical Pearls for NEET-PG:** * **Classification:** Hemorrhagic shock is divided into four classes based on blood loss. **Class II** (15-30% loss) is usually the earliest stage where tachycardia is consistently seen. * **First Sign:** The earliest clinical sign of compensated hypovolemic shock is often **tachycardia**, while the earliest sign of uncompensated shock is **hypotension**. * **Lethal Triad of Trauma:** Acidosis, Hypothermia, and Coagulopathy. * **Management:** The priority is "Stop the Bleed" and volume replacement. In trauma, the current standard is **Balanced Resuscitation** (using blood products in a 1:1:1 ratio) rather than excessive crystalloids.

Question 627: Capillary refill is present in which degree of burn?

A. Third degree burns
B. First degree burns
C. Second degree burns (Correct Answer)
D. Fourth degree burns

Explanation: **Explanation:** The assessment of **capillary refill** is a critical clinical indicator used to differentiate the depth of a burn injury. It relies on the presence of intact, functioning dermal microvasculature. **Why Second-degree burns is correct:** Second-degree (partial-thickness) burns involve the epidermis and varying depths of the dermis. In **Superficial Partial-Thickness burns**, the dermal papillae and their capillary loops remain intact. When pressure is applied, the area blanches, and upon release, the capillaries refill promptly. This indicates that the blood supply to the skin is still functional, though the nerve endings are exposed, making these burns exquisitely painful. **Why other options are incorrect:** * **First-degree burns:** These involve only the epidermis (e.g., sunburn). While they show erythema and blanching, the question specifically tests the clinical classification where "capillary refill" is the hallmark of dermal involvement. * **Third-degree burns:** These are full-thickness burns extending through the entire dermis into the subcutaneous fat. The dermal capillary plexus is completely destroyed (coagulative necrosis), resulting in a leathery, charred, or pearly white appearance with **absent capillary refill**. * **Fourth-degree burns:** These involve deeper structures like muscle and bone. Similar to third-degree burns, there is no skin vascularity remaining, and thus, no capillary refill. **High-Yield Clinical Pearls for NEET-PG:** * **Pain:** Second-degree burns are the most painful. Third and fourth-degree burns are typically **painless** due to the destruction of nerve endings. * **Blisters:** The presence of blisters is a classic sign of **Second-degree burns**. * **Healing:** Superficial second-degree burns heal within 2-3 weeks without scarring, whereas deep second-degree burns may require grafting to prevent hypertrophic scarring. * **Rule of Nines:** Always remember this for calculating the Total Body Surface Area (TBSA) in the initial management of burn patients.

Question 628: What is the emergency treatment for a patient with a brain injury presenting in shock?

A. Hypotensive resuscitation to prevent brain edema
B. Increase intracranial hemorrhage
C. Emergency craniotomy
D. Maintaining euvolemia (Correct Answer)

Explanation: **Explanation:** In the management of traumatic brain injury (TBI), the primary goal is to prevent **secondary brain injury**. The brain is highly sensitive to hypotension; even a single episode of systolic blood pressure <90 mmHg significantly increases morbidity and mortality. **Why "Maintaining Euvolemia" is correct:** The physiological priority in TBI is ensuring adequate **Cerebral Perfusion Pressure (CPP)**. Since $CPP = MAP - ICP$ (Mean Arterial Pressure - Intracranial Pressure), any drop in systemic blood pressure (hypovolemia) directly reduces blood flow to the injured brain, exacerbating ischemia and edema. Therefore, aggressive fluid resuscitation to achieve euvolemia and maintain a systolic BP of at least 100–110 mmHg (depending on age) is mandatory. **Analysis of Incorrect Options:** * **A. Hypotensive resuscitation:** While "permissive hypotension" is sometimes used in isolated truncal trauma to limit bleeding, it is **strictly contraindicated** in TBI. Low BP leads to cerebral ischemia, worsening the primary injury. * **B. Increase intracranial hemorrhage:** This is a potential complication of over-resuscitation or coagulopathy, not a treatment goal. * **C. Emergency craniotomy:** While surgery may be needed for hematoma evacuation, the immediate "emergency treatment" for a patient in shock is hemodynamic stabilization (ABCDE). You cannot safely take an unstable, shocked patient to the OR without initial resuscitation. **NEET-PG High-Yield Pearls:** * **The "Lethal Triad" in Trauma:** Acidosis, Coagulopathy, and Hypothermia. * **Cushing’s Triad (Sign of high ICP):** Hypertension, Bradycardia, and Irregular respirations. * **Fluid of Choice:** Isotonic saline (0.9% NaCl) is preferred. Avoid hypotonic fluids (like D5W or 0.45% NS) as they worsen cerebral edema. * **Target MAP:** Aim for a MAP >80 mmHg to maintain CPP between 60–70 mmHg.

Question 629: Which of the following is NOT an indication for admission in a burns ward?

A. Acid burns
B. Inhalational injury
C. Partial thickness burns involving 5% of the total body surface area in an unmarried female (Correct Answer)
D. Deep burns involving 10% of the total body surface area in a male

Explanation: The American Burn Association (ABA) and standard surgical protocols define specific criteria for admission to a specialized burn unit. Admission is generally required for burns that are extensive, involve critical areas, or result from high-risk mechanisms. ### **Explanation of Options** * **Correct Answer (C):** Partial thickness (2nd degree) burns involving **<10% TBSA** in adults (who are otherwise healthy) can typically be managed on an outpatient basis. The marital status of the patient is not a clinical criterion for admission. * **Option A (Acid burns):** Chemical burns, including acid and alkali burns, carry a high risk of deep tissue destruction and systemic toxicity, necessitating inpatient monitoring and specialized wound care. * **Option B (Inhalational injury):** Any suspicion of smoke inhalation or airway injury is a mandatory indication for admission due to the risk of delayed upper airway edema and respiratory failure. * **Option D (Deep burns 10% TBSA):** Full-thickness (3rd degree) burns involving >5% TBSA or partial-thickness burns involving >10% TBSA in adults require admission for fluid resuscitation and surgical intervention (grafting). ### **High-Yield Clinical Pearls for NEET-PG** * **ABA Admission Criteria:** 1. Partial thickness burns **>10% TBSA**. 2. Burns involving **face, hands, feet, genitalia, perineum, or major joints**. 3. **Third-degree (full-thickness)** burns in any age group. 4. **Electrical burns** (including lightning) and **Chemical burns**. 5. **Inhalational injury**. 6. Burn injury in patients with **pre-existing medical disorders** (e.g., Diabetes, COPD). 7. Burn injury with **concomitant trauma** (where the burn is the major risk). * **Rule of Nines:** Used for quick TBSA estimation; remember that the palm (including fingers) of the patient represents approximately **1% TBSA**. * **Parkland Formula:** $4 \text{ mL} \times \text{Body Weight (kg)} \times \% \text{ TBSA}$. Give half in the first 8 hours.

Question 630: A teenage boy sustains a severe crush injury after falling from his bicycle and being run over by a truck. On arrival in the emergency room, he is awake and alert, appearing frightened but in no acute distress. A chest radiograph reveals an air-fluid level in the left lower lung field, and the nasogastric tube appears to be coiled upward into the left chest. What is the next best step in management?

A. Placement of a left chest tube
B. Immediate thoracotomy
C. Immediate celiotomy (Correct Answer)
D. Esophagogastroscopy

Explanation: ### Explanation **Correct Option: C. Immediate celiotomy (Laparotomy)** The clinical presentation is pathognomonic for a **Traumatic Diaphragmatic Rupture (TDR)**. The presence of an air-fluid level in the left chest (representing the stomach or bowel) and a nasogastric (NG) tube coiled in the thorax are classic radiological signs. In the **acute phase** of a traumatic diaphragmatic injury, the preferred surgical approach is **celiotomy (laparotomy)**. This is because: 1. It allows for easy reduction of herniated abdominal contents. 2. It provides superior access to evaluate and repair associated intra-abdominal injuries (liver, spleen, or bowel), which are present in the majority of blunt trauma cases. --- ### Why Other Options are Incorrect: * **A. Placement of a left chest tube:** This is dangerous. If the stomach or bowel is herniated into the chest, inserting a chest tube can result in **iatrogenic perforation** of the viscera, leading to tension fecopneumothorax or empyema. * **B. Immediate thoracotomy:** While a transthoracic approach is preferred for *chronic* diaphragmatic hernias (to manage adhesions), it is not the initial choice in acute trauma as it does not allow for a full abdominal exploration. * **D. Esophagogastroscopy:** This has no role in the primary management of diaphragmatic rupture and would delay definitive surgical repair. --- ### NEET-PG Clinical Pearls: * **Side Predilection:** Left-sided ruptures are more common (approx. 75-80%) because the liver provides a protective "buffer" on the right side. * **Gold Standard Diagnosis:** While CXR is the initial screening tool, **Contrast-enhanced CT (CECT)** is the investigation of choice, showing the "Collar sign" or "Dependent viscera sign." * **Mechanism:** Blunt trauma causes a sudden increase in intra-abdominal pressure, leading to a radial tear in the posterolateral diaphragm (the weakest point). * **Management Rule:** Acute trauma = Laparotomy; Chronic/Delayed presentation = Thoracotomy.

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