Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 551: Fracture at the angle of the mandible most commonly involves which tooth?

A. Second premolar
B. First molar
C. Incisor
D. Third molars (Correct Answer)

Explanation: **Explanation:** The **third molar (wisdom tooth)** is the correct answer due to the structural anatomy of the mandible. The angle of the mandible is a transition zone between the horizontal body and the vertical ramus. This area is inherently weakened by the presence of the third molar socket, especially if the tooth is **impacted**. An impacted third molar reduces the cross-sectional area of bone at the angle, creating a point of least resistance. Biomechanically, when a force is applied to the mandible, stress concentrates at this site, making it the most common location for fractures in the posterior mandible. **Analysis of Incorrect Options:** * **Second Premolar (A):** Fractures in this region are typically associated with the **mental foramen**, which is a weak point in the body of the mandible, but it is not the most common site compared to the angle. * **First Molar (B):** While the body of the mandible is a common site for fractures, the first molar region is structurally thicker and more robust than the angle containing a third molar. * **Incisors (C):** Fractures in the midline (symphysis) or parasymphysis are common in "guardsman fractures" (falls on the chin), but they do not occur at the angle. **Clinical Pearls for NEET-PG:** * **Most common site of Mandibular Fracture:** Condyle (overall), followed by the Angle and Symphysis. * **Weakest points of the Mandible:** Condylar neck, Angle (due to 3rd molars), and Mental foramen. * **Nerve Injury:** Angle fractures frequently involve the **Inferior Alveolar Nerve**, leading to paresthesia of the lower lip. * **Muscle Pull:** The displacement of angle fractures is determined by the pull of the masseter, medial pterygoid, and temporal muscles (classified as "favorable" or "unfavorable" fractures).

Question 552: Which of the following does NOT require hospitalization?

A. 5% burns in children (Correct Answer)
B. 10% scalds in children
C. Electrocution
D. 15% deep burns in adults

Explanation: **Explanation:** The decision to hospitalize a burn patient is based on the **American Burn Association (ABA) criteria** for referral to a burn center. These criteria consider the Total Body Surface Area (TBSA) affected, the depth of the burn, the age of the patient, and the mechanism of injury. **1. Why Option A is correct:** In children, hospitalization is generally indicated for partial-thickness burns involving **>10% TBSA**. A 5% burn in a child, provided it is superficial, does not involve critical areas (face, hands, feet, genitalia), and is not associated with inhalation injury or suspected abuse, can typically be managed on an outpatient basis. **2. Analysis of Incorrect Options:** * **B. 10% scalds in children:** Scalds are often deep partial-thickness burns. In the pediatric population, any burn approaching or exceeding 10% TBSA requires admission for fluid resuscitation and specialized wound care. * **C. Electrocution:** All high-voltage electrical burns require mandatory hospitalization. These injuries are notorious for "iceberg" effects, where significant deep tissue/muscle damage exists despite minimal skin findings, posing a high risk for rhabdomyolysis, acute kidney injury, and cardiac arrhythmias. * **D. 15% deep burns in adults:** For adults (ages 10–50), the threshold for hospitalization is **>15% TBSA** for partial-thickness burns or any full-thickness (3rd degree) burn >5%. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 9s:** Used for adults; for children, use the **Lund-Browder chart** (as head size is proportionally larger). * **Parkland Formula:** $4 \text{ ml} \times \text{kg} \times \% \text{TBSA}$. Give half in the first 8 hours. * **Critical Areas:** Burns to the face, hands, feet, genitalia, or major joints always require specialist referral regardless of TBSA percentage. * **Inhalation Injury:** Suspect if there are singed nasal hairs, carbonaceous sputum, or history of confinement in a fire; these patients require immediate intubation/admission.

Question 553: A 35-year-old chemical factory worker presents to the emergency department after a sudden splash of an unknown chemical onto his hands and feet. Which of the following statements is true regarding the management of chemical burns, except?

A. Copious irrigation with water should be performed.
B. Alkali burns are generally more destructive and dangerous than acid burns.
C. Attempts should be made to neutralize the chemical. (Correct Answer)
D. Topical calcium gluconate is used in the treatment of hydrofluoric acid burns.

Explanation: **Explanation:** The management of chemical burns focuses on immediate decontamination and preventing further tissue damage. **Why Option C is the correct (False) statement:** Neutralization of a chemical (e.g., adding an acid to an alkali) is **strictly contraindicated**. The chemical reaction of neutralization is exothermic, meaning it releases significant heat. This can cause additional thermal injury to already damaged tissues, potentially worsening the depth of the burn. **Analysis of other options:** * **Option A:** Copious irrigation with water or saline is the cornerstone of management. It dilutes the chemical and washes it away. Irrigation should continue for at least 30–60 minutes (longer for alkalis). * **Option B:** Alkali burns are more dangerous because they cause **liquefactive necrosis**, which allows the chemical to penetrate deeper into the tissues. Acid burns cause **coagulative necrosis**, forming a leathery eschar that acts as a barrier to further penetration. * **Option D:** Hydrofluoric acid (HF) is unique; it causes deep tissue destruction and life-threatening hypocalcemia. Topical **calcium gluconate gel** (or intra-arterial injection) is the specific antidote used to neutralize the fluoride ion. **NEET-PG High-Yield Pearls:** 1. **Initial Step:** Remove all contaminated clothing and brush off dry powders (like lime) before irrigation. 2. **Alkali vs. Acid:** Alkali = Liquefactive necrosis (Deep); Acid = Coagulative necrosis (Superficial). 3. **Specific Antidotes:** * **Hydrofluoric Acid:** Calcium gluconate. * **White Phosphorus:** 1% Copper sulfate (turns particles black for easy removal). * **Phenol:** Polyethylene glycol (PEG) or glycerol.

Question 554: What is the Glasgow Coma Scale score for a mild head injury?

A. 3-8
B. 9-12
C. 13-14
D. 15 (Correct Answer)

Explanation: ### Explanation The Glasgow Coma Scale (GCS) is the gold standard for assessing the level of consciousness and severity of traumatic brain injury (TBI). It evaluates three components: Eye opening (4), Verbal response (5), and Motor response (6), with a total score ranging from 3 to 15. **1. Why Option D is Correct:** According to the Advanced Trauma Life Support (ATLS) guidelines, head injuries are classified based on the GCS score: * **Mild TBI:** GCS 13–15 * **Moderate TBI:** GCS 9–12 * **Severe TBI:** GCS 3–8 While "Mild" traditionally encompasses 13–15, in many competitive exams like NEET-PG, a score of **15** is specifically highlighted as the hallmark of a mild injury where the patient is awake and oriented. **2. Analysis of Incorrect Options:** * **Option A (3-8):** This represents **Severe TBI**. A score of 8 or less is the clinical threshold for coma and typically indicates the need for definitive airway management (intubation). * **Option B (9-12):** This represents **Moderate TBI**. These patients are lethargic or stuporous and require urgent CT imaging and close neurosurgical monitoring. * **Option C (13-14):** While these scores fall under the "Mild" category, they often indicate a slightly higher risk of intracranial pathology compared to a perfect score of 15. **3. Clinical Pearls for NEET-PG:** * **Minimum GCS:** 3 (Dead/Deep Coma); **Maximum GCS:** 15 (Normal). * **Motor Component:** The most reliable prognostic indicator of the three components. * **GCS-P:** A newer variant that subtracts the "Pupillary response" from the GCS score to better predict mortality. * **Mnemonic:** "Less than 8, Intubate" (Crucial for trauma management).

Question 555: What is the initial management for a patient with 40% blood volume loss?

A. Vasopressor agents
B. Cardiac stimulants
C. Crystalloid infusion (Correct Answer)
D. Intracardiac adrenaline

Explanation: **Explanation:** The patient is in **Class III/IV Hemorrhagic Shock** (40% blood loss corresponds to Class IV, where blood loss is >2000 mL). The primary pathophysiology in trauma-induced hemorrhagic shock is a critical reduction in circulating volume (hypovolemia), leading to decreased preload and tissue hypoperfusion. **1. Why Crystalloid Infusion is Correct:** The cornerstone of initial resuscitation (ATLS guidelines) is the restoration of intravascular volume. **Isotonic crystalloids** (like Ringer’s Lactate or Normal Saline) are the first-line fluids used to stabilize hemodynamics and maintain organ perfusion. While Class IV shock eventually requires blood transfusion (MTP), the *initial* immediate management in any trauma setting is establishing IV access and starting crystalloid boluses. **2. Why Incorrect Options are Wrong:** * **A & B (Vasopressors/Cardiac Stimulants):** These are contraindicated as initial therapy. Vasopressors cause vasoconstriction in an already depleted vascular bed, worsening tissue ischemia. The heart is usually already tachycardic to compensate; stimulants increase myocardial oxygen demand without fixing the underlying volume deficit. * **D (Intracardiac Adrenaline):** This is an obsolete practice reserved only for specific cardiac arrest scenarios, not for the management of hypovolemic shock. **High-Yield Clinical Pearls for NEET-PG:** * **ATLS Classification:** Class I (<15%), Class II (15-30%), Class III (30-40%), Class IV (>40%). * **Fluid of Choice:** Ringer’s Lactate is preferred over Normal Saline to avoid hyperchloremic metabolic acidosis. * **The "Golden Hour":** Rapid volume replacement within the first hour significantly improves survival. * **Permissive Hypotension:** In non-compressible torso hemorrhage, target a lower MAP (approx. 65 mmHg) until bleeding is surgically controlled to prevent "popping the clot."

Question 556: The above procedure is contraindicated in which of the following conditions?

A. Pleural effusion
B. Lung abscess (Correct Answer)
C. Hemothorax
D. Hydropneumothorax

Explanation: ***Lung abscess*** - **Intercostal chest drain (ICD)** insertion is contraindicated as it risks **pleural contamination** and development of **empyema** by creating a direct communication between the infected lung parenchyma and pleural space. - The procedure could lead to **spillage of purulent material** into the pleural cavity, converting a localized parenchymal infection into a more serious pleural space infection. *Pleural effusion* - **ICD insertion** is a **standard treatment** for large or symptomatic pleural effusions to drain accumulated fluid and improve respiratory function. - The procedure is safe and effective for removing **transudate** or **exudate** from the pleural space without risk of contamination. *Hemothorax* - **ICD insertion** is **indicated** for hemothorax to drain accumulated blood from the pleural space and prevent **fibrothorax** formation. - Early drainage helps assess ongoing bleeding and facilitates **lung re-expansion**, making it a therapeutic rather than contraindicated procedure. *Hydropneumothorax* - **ICD insertion** is the **treatment of choice** for hydropneumothorax to simultaneously drain both air and fluid from the pleural space. - The procedure effectively manages both components of the condition, allowing **lung re-expansion** and resolution of respiratory compromise.

Question 557: Which of the following is true for shock?

A. hypotension
B. hypoperfusion to tissues
C. hypoxia
D. all of the above (Correct Answer)

Explanation: **Explanation:** Shock is fundamentally defined as a state of **acute circulatory failure** where the cardiovascular system fails to provide adequate oxygenated blood to the tissues. 1. **Hypoperfusion to tissues (Option B):** This is the core physiological hallmark of shock. Regardless of the etiology (hypovolemic, cardiogenic, distributive, or obstructive), the primary defect is the failure of the microcirculation to meet the metabolic demands of the tissues. 2. **Hypoxia (Option C):** As a direct consequence of hypoperfusion, there is a mismatch between oxygen delivery ($DO_2$) and oxygen consumption ($VO_2$). This leads to **cellular hypoxia**, forcing cells to shift from aerobic to anaerobic metabolism, resulting in lactic acidosis. 3. **Hypotension (Option A):** While shock can be "compensated" in early stages (where BP remains normal due to sympathetic activation), **hypotension** (Systolic BP <90 mmHg or a 40 mmHg drop from baseline) is a classic clinical sign of progressive and decompensated shock. Since all three components—low blood pressure, inadequate tissue perfusion, and subsequent cellular oxygen debt—characterize the syndrome, **Option D** is the correct answer. **Clinical Pearls for NEET-PG:** * **Earliest sign of shock:** Tachycardia (except in neurogenic shock, which presents with bradycardia). * **Best indicator of tissue perfusion:** Urine output (aim for >0.5 ml/kg/hr) and Serum Lactate levels. * **Shock Index:** Heart Rate / Systolic BP (Normal: 0.5–0.7). An index >0.9 suggests significant occult shock. * **Warm Shock vs. Cold Shock:** Distributive shock (Sepsis/Anaphylaxis) initially presents with vasodilation (warm), whereas Hypovolemic and Cardiogenic shock present with peripheral vasoconstriction (cold/clammy).

Question 558: Le Fort II facial fracture implies which of the following?

A. Fracture running through the alveolar ridge
B. Fracture running through the midline of the palate and zygomaticomaxillary suture
C. Fracture running through the zygomatic process of the maxilla, floor of orbit, and root of nose on one side only
D. Fracture running through the zygomatic process of the maxilla, floor of orbit, and root of nose on both sides (Correct Answer)

Explanation: ### Explanation The **Le Fort classification** system categorizes midface fractures based on the lines of weakness in the facial skeleton. **Le Fort II (Pyramidal Fracture)** involves a fracture line that starts at the nasal bones (nasofrontal suture), extends through the lacrimal bones, the inferior orbital floor, and the infraorbital rim, and then passes through the **zygomaticomaxillary suture** down to the pterygoid plates. Because these fractures are typically the result of a central impact, they are **bilateral**, resulting in a pyramid-shaped mobile segment of the midface. #### Analysis of Options: * **Option D (Correct):** Accurately describes the anatomical path of a Le Fort II fracture involving the root of the nose, orbital floor, and zygomatic process of the maxilla bilaterally. * **Option A:** Describes a **Le Fort I (Guerin’s fracture)**, which is a horizontal fracture separating the alveolar ridge and palate from the rest of the maxilla (floating palate). * **Option B:** A midline palate fracture is a sagittal fracture, not part of the standard Le Fort classification. * **Option C:** Le Fort fractures are by definition bilateral in their classical description; a unilateral fracture would be described as a complex maxillary or zygomaticomaxillary complex (ZMC) fracture. #### High-Yield Clinical Pearls for NEET-PG: * **Le Fort I:** Horizontal fracture; "Floating Palate." * **Le Fort II:** Pyramidal fracture; involves the **infraorbital nerve** (leading to anesthesia of the cheek). * **Le Fort III:** Craniofacial dysjunction; the fracture line passes through the zygomatic arches and the orbits, separating the entire facial skeleton from the cranial base. * **Clinical Sign:** "Dish-face deformity" is most characteristic of Le Fort II and III. * **Management:** Always prioritize the airway; Le Fort fractures can cause posterior displacement of the maxilla, obstructing the oropharynx. Nasotracheal intubation is generally contraindicated if a cribriform plate fracture is suspected.

Question 559: What is the probable cause of sudden death in a case of superficial injury to the neck?

A. Injury to phrenic nerve
B. Air embolism through external jugular vein (Correct Answer)
C. Bleeding from subclavian artery
D. Injury to trachea

Explanation: ### **Explanation** **1. Why Option B is Correct:** The neck contains superficial veins, most notably the **External Jugular Vein (EJV)**, which lies superficial to the sternocleidomastoid muscle. In the event of a superficial laceration, the EJV can be injured. Because the venous pressure in the neck is often **sub-atmospheric (negative)**—especially during inspiration—air can be sucked into the venous system. Furthermore, the EJV is held patent by the deep fascia, preventing the vessel from collapsing when cut. This leads to a **Venous Air Embolism (VAE)**. If a large volume of air (typically >100ml) reaches the right ventricle, it creates an "air lock," obstructing blood flow to the lungs, leading to sudden cardiovascular collapse and death. **2. Why Other Options are Incorrect:** * **A. Injury to Phrenic Nerve:** The phrenic nerve (C3-C5) lies deep to the prevertebral fascia on the anterior scalene muscle. A superficial injury is unlikely to reach it. Even if injured, unilateral palsy causes diaphragmatic paralysis but not sudden death. * **C. Bleeding from Subclavian Artery:** The subclavian artery is a deep structure protected by the clavicle and dense fascia. While injury causes massive hemorrhage, it is not considered a "superficial" neck injury. * **D. Injury to Trachea:** Tracheal injuries cause respiratory distress, surgical emphysema, or pneumothorax, but they rarely result in "sudden" death unless there is total airway occlusion or massive aspiration of blood. **3. Clinical Pearls for NEET-PG:** * **Mill-Wheel Murmur:** A characteristic splashing auscultatory sound heard over the precordium in air embolism. * **Durant’s Maneuver:** Management involves placing the patient in the **Left Lateral Decubitus and Trendelenburg position** to trap the air bubble in the apex of the right ventricle, away from the pulmonary artery. * **Negative Pressure:** The risk of air embolism is highest in the "danger zone" of the neck where venous pressure is lower than atmospheric pressure.

Question 560: Massive blood transfusion is defined as:

A. Replacement of the entire blood volume within a 24-hour period (Correct Answer)
B. Replacement of half the blood volume within a 24-hour period
C. Replacement of 40% of the blood volume within a 24-hour period
D. Replacement of 60% of the blood volume within a 24-hour period

Explanation: **Explanation:** **Massive Blood Transfusion (MBT)** is a critical clinical intervention defined by the volume of blood products required to stabilize a patient with life-threatening hemorrhage. The classic and most widely accepted definition is the **replacement of a patient’s total blood volume within a 24-hour period** (approximately 10 units of packed red blood cells in a 70kg adult). **Why Option A is correct:** The definition reflects the physiological threshold where the patient’s original blood has been entirely replaced by exogenous products. This is a critical milestone because it marks the point where complications like dilutional coagulopathy, hypocalcemia, and hypothermia become significantly more likely, requiring a shift from standard resuscitation to a "Massive Transfusion Protocol" (MTP). **Why other options are incorrect:** Options B, C, and D (40%, 50%, or 60% replacement) do not meet the standard threshold for MBT. While these volumes represent significant blood loss (Class III or IV shock), they do not traditionally trigger the specific definition or the aggressive multi-component replacement protocols associated with "Massive" transfusion. **High-Yield Clinical Pearls for NEET-PG:** * **Alternative Definition:** Transfusion of >4 units of PRBCs in 1 hour or replacement of 50% of total blood volume within 3 hours. * **The Lethal Triad:** MBT is often initiated to combat the "Lethal Triad" of trauma: **Acidosis, Hypothermia, and Coagulopathy.** * **MTP Ratio:** Modern trauma surgery emphasizes a **1:1:1 ratio** (PRBC: FFP: Platelets) to mimic whole blood and prevent dilutional coagulopathy. * **Complications:** Watch for **hypocalcemia** (due to citrate toxicity), **hyperkalemia** (from stored RBC lysis), and **metabolic alkalosis** (as citrate converts to bicarbonate).

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Trauma — MCQs

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