Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 611: After trauma, hypovolemic shock can be due to all EXCEPT:

A. Head injury (Correct Answer)
B. Blunt trauma to abdominal viscera
C. Hemothorax
D. Pelvic fracture

Explanation: **Explanation:** The core principle in trauma management is that **isolated head injury does not cause hypovolemic shock.** The cranial vault is a rigid, enclosed space; the volume of blood required to cause hemorrhagic shock (typically >15-30% of total blood volume) cannot accumulate inside the skull without causing fatal brain herniation first. If a patient with a head injury is in shock, the clinician must look for an extracranial source of bleeding. * **Option A (Correct):** While head injuries cause neurological deficits or "Neurogenic shock" (rarely, and usually associated with spinal cord injury), they do not cause hypovolemia. The only exception is in infants, where the open fontanelles allow enough blood to accumulate to cause shock. * **Option B:** Blunt trauma to abdominal viscera (e.g., splenic or liver laceration) is a classic cause of massive intraperitoneal hemorrhage leading to hypovolemic shock. * **Option C:** Each hemithorax can hold up to 1.5–2 liters of blood. A massive hemothorax is a common cause of rapid hemorrhagic shock. * **Option D:** Pelvic fractures, especially "open book" types, can lead to extensive retroperitoneal bleeding (often 2 liters or more), making it a major source of hypovolemia. **Clinical Pearls for NEET-PG:** * **The "Fatal Five" areas of hemorrhage:** Chest, Abdomen, Pelvis/Retroperitoneum, Long bones (Femur), and "The Floor" (external bleeding). * **Cushing’s Triad:** In head injuries with increased ICP, you see **Hypertension** and Bradycardia—the opposite of the hypotension and tachycardia seen in hypovolemic shock. * **Rule of Thumb:** If a trauma patient is hypotensive, it is **hemorrhagic shock** until proven otherwise.

Question 612: A patient involved in a road traffic accident presents with a pulse rate of 96 beats per minute, a systolic blood pressure of 68 mmHg, and a respiratory rate of 20 breaths per minute. The patient is confused. What is the likely percentage of blood loss?

A. 15%
B. 25%
C. 35% (Correct Answer)
D. 45%

Explanation: This question tests your knowledge of the **ATLS (Advanced Trauma Life Support) Classification of Hemorrhagic Shock**, a high-yield topic for NEET-PG. ### **1. Why Option C (35%) is Correct** The patient is in **Class III Hemorrhage** (1500–2000 mL or **30–40% blood loss**). The key clinical indicators in this scenario are: * **Blood Pressure:** Hypotension (SBP <90 mmHg) is the hallmark of Class III shock. In Classes I and II, compensatory mechanisms maintain a normal SBP. * **Mental Status:** The patient is **confused**. Class I and II patients are usually alert or slightly anxious; confusion signifies significant cerebral hypoperfusion. * **Heart Rate:** While the pulse is 96 bpm (borderline), the presence of hypotension and confusion overrides the heart rate in staging. ### **2. Why Other Options are Incorrect** * **Option A (15%):** Corresponds to **Class I**. Vital signs (BP, HR, RR) are typically normal, and the patient is alert. * **Option B (25%):** Corresponds to **Class II** (15–30%). While tachycardia and narrowed pulse pressure occur, the **systolic BP remains normal**. The patient is usually only anxious. * **Option D (45%):** Corresponds to **Class IV** (>40%). This is pre-terminal. The patient would be lethargic/comatose, with severe tachycardia (>140) and negligible urine output. ### **3. NEET-PG High-Yield Pearls** * **Earliest Sign of Shock:** Tachycardia (except in Class I). * **Earliest Change in Vital Signs:** Narrowed Pulse Pressure (seen in Class II). * **The "Rule of 70/80/90":** If you can feel a radial pulse, SBP is at least 80 mmHg; femoral is 70; carotid is 60 (Traditional teaching, though ATLS now emphasizes clinical shock over specific numbers). * **Management:** Class I & II usually require crystalloids; **Class III & IV require blood transfusion.**

Question 613: Which splint is most commonly used in dentulous mandibular fractures?

A. Gunning splint
B. Cap splint (Correct Answer)
C. Ribbon splint
D. All of these

Explanation: In maxillofacial surgery, the choice of splinting depends primarily on the presence or absence of teeth (dentition). **Correct Answer: B. Cap splint** Cap splints (specifically **Silver Copper Alloy Cap Splints**) are the gold standard for stabilizing fractures in a **dentulous** (teeth present) mandible. They are custom-fabricated in a laboratory after taking an impression of the patient's teeth. The splint "caps" the crowns of the teeth and is cemented into place, providing rigid internal fixation and maintaining the patient's pre-traumatic occlusion (bite). They are particularly useful in comminuted fractures or when intermaxillary fixation (IMF) is required for a prolonged period. **Explanation of Incorrect Options:** * **A. Gunning splint:** This is the classic splint used for **edentulous** (toothless) mandibular or maxillary fractures. It acts as a substitute for dentures, allowing for IMF by using the patient's alveolar ridges for support. * **C. Ribbon splint:** These are less commonly used today; they are thin metallic strips used for minor stabilization but do not provide the rigid, comprehensive coverage required for major mandibular fractures compared to cap splints. **High-Yield Clinical Pearls for NEET-PG:** * **Gunning Splint = Edentulous** patients (Think: "Gunning for the toothless"). * **Cap Splint = Dentulous** patients. * **Arch Bars (Erich’s):** The most common method for temporary Intermaxillary Fixation (IMF) in dentulous patients before definitive surgery. * **Eyelet Wiring (Ivy loops):** Used for simple, minimally displaced fractures in dentulous patients. * **Mandibular Fracture Site:** The **condyle** is the most common site of fracture in the mandible (followed by the angle and symphysis).

Question 614: Floating maxilla is typically found in which type of fracture?

A. Le Fort I or Guerin fractures (Correct Answer)
B. Le Fort II or pyramidal fractures
C. Craniomandibular dysjunction
D. All of the above

Explanation: **Explanation:** The term **"Floating Maxilla"** refers specifically to the **Le Fort I fracture**, also known as a **Guerin fracture**. 1. **Why Le Fort I is correct:** This is a horizontal fracture that runs above the level of the teeth and palate, passing through the maxillary sinus, lower nasal septum, and pterygoid plates. This detachment separates the alveolar process and hard palate from the rest of the midface. Because the entire dental arch and palate become mobile and independent of the skull base, it is clinically described as a "floating maxilla." 2. **Why other options are incorrect:** * **Le Fort II (Pyramidal fracture):** This fracture involves the nasal bones, maxillary sinuses, and infraorbital rims. It results in a **"Floating Midface"** (the nose and maxilla move as a pyramid-shaped unit), rather than just the maxilla. * **Craniomandibular dysjunction:** This is a misnomer in this context. The correct term is **Craniofacial dysjunction**, which refers to **Le Fort III** fractures. In Le Fort III, the entire facial skeleton is separated from the cranial base, leading to a massive mobility of the whole face. **High-Yield Clinical Pearls for NEET-PG:** * **Le Fort I:** Floating Maxilla (Guerin's sign: ecchymosis in the palate). * **Le Fort II:** Pyramidal fracture; involves the **infraorbital nerve** (anesthesia of the cheek). * **Le Fort III:** Craniofacial dysjunction; involves the **zygomatic arch**; associated with CSF rhinorrhea and "Dish-face" deformity. * **Pterygoid Plates:** Involvement of the pterygoid plates is a mandatory diagnostic feature for *all* Le Fort fractures.

Question 615: A male patient with blunt abdominal trauma is hemodynamically stable. What is the next line of management?

A. Observation
B. Further imaging of the abdomen (Correct Answer)
C. Exploratory laparotomy
D. Laparoscopy

Explanation: **Explanation:** The management of blunt abdominal trauma (BAT) is primarily dictated by the patient's **hemodynamic stability**. **1. Why "Further imaging of the abdomen" is correct:** In a hemodynamically stable patient, there is time to perform a detailed evaluation to identify specific organ injuries. The gold standard investigation for a stable patient with BAT is a **Contrast-Enhanced Computed Tomography (CECT) of the abdomen**. CECT is highly sensitive and specific for diagnosing solid organ injuries (liver, spleen, kidney), grading them, and detecting retroperitoneal injuries or hemoperitoneum. **2. Why other options are incorrect:** * **Observation (A):** While stable patients are observed, "observation" alone without a definitive diagnosis is incomplete. Imaging must be performed first to determine if the patient can be managed non-operatively or requires intervention. * **Exploratory Laparotomy (C):** This is indicated only if the patient is hemodynamically **unstable** with a positive FAST/DPL, or if there are signs of peritonitis or evisceration. Performing surgery on a stable patient without imaging leads to unnecessary "non-therapeutic" laparotomies. * **Laparoscopy (D):** This is generally not the first-line diagnostic tool in trauma. It may be used in specific cases (e.g., suspected diaphragmatic injury) but only after initial imaging. **High-Yield Clinical Pearls for NEET-PG:** * **Unstable Patient + Blunt Trauma:** Perform **FAST** (Focused Assessment with Sonography for Trauma). If FAST is positive $\rightarrow$ Laparotomy. * **Stable Patient + Blunt Trauma:** Perform **CECT Abdomen**. * **Most common organ injured in BAT:** Spleen (followed by Liver). * **Seat belt sign:** Associated with hollow viscus injury (small bowel) and Chance fractures of the spine. * **Kehr’s Sign:** Referred pain to the left shoulder, indicating splenic rupture/diaphragmatic irritation.

Question 616: A 23-year-old man was involved in a motor vehicle accident. What is the diagnosis?

A. Aortic dissection
B. Cardiac rupture
C. Diaphragmatic rupture
D. Pneumothorax (Correct Answer)

Explanation: ***Pneumothorax*** - **Visible pleural line** and **absent peripheral lung markings** on CXR are pathognomonic for pneumothorax in trauma patients. - Common in **blunt chest trauma** from motor vehicle accidents, causing air accumulation in the pleural space. *Aortic dissection* - Typically presents with **widened mediastinum** on CXR and severe **chest/back pain**. - Requires **CT angiography** for diagnosis and shows **intimal flap** within the aortic lumen. *Cardiac rupture* - Extremely rare and usually **fatal within minutes** due to **cardiac tamponade**. - Would show **enlarged cardiac silhouette** and **hemopericardium** on imaging, not pleural line changes. *Diaphragmatic rupture* - Shows **bowel loops** or **abdominal organs** in the chest cavity on CXR. - More common on the **left side** and requires **high suspicion** as initial CXR may be normal.

Question 617: Adson's test is elicited in a suspected case of which condition?

A. Congenital dislocation of hip
B. Cervical rib (Correct Answer)
C. Subluxation of shoulder
D. Direct inguinal hernia

Explanation: **Explanation:** **Adson’s Test** is a clinical maneuver used to diagnose **Thoracic Outlet Syndrome (TOS)**, most commonly caused by a **Cervical Rib** or scalene hypertrophy. The test aims to detect compression of the subclavian artery as it passes through the scalene triangle. **Mechanism:** The patient is asked to take a deep breath (which elevates the first rib), extend their neck, and turn their head toward the affected side. The clinician simultaneously palpates the radial pulse. A **positive test** is indicated by a significant weakening or disappearance of the radial pulse, suggesting arterial compression by the cervical rib or tight scalene muscles. **Analysis of Incorrect Options:** * **A. Congenital Dislocation of Hip (CDH/DDH):** Diagnosed using **Barlow’s** (dislocatability) and **Ortolani’s** (reducibility) maneuvers in neonates. * **C. Subluxation of Shoulder:** Evaluated using the **Apprehension test**, Sulcus sign, or Dugas test. * **D. Direct Inguinal Hernia:** Assessed via the **Malgaigne’s bulges** and the **Finger Invagination test** (Internal ring occlusion test helps differentiate it from indirect hernia). **High-Yield Clinical Pearls for NEET-PG:** * **Cervical Rib:** A supernumerary rib arising from the C7 vertebra. It is the most common cause of neurogenic TOS (compressing the lower trunk of the brachial plexus, T1 > C8). * **Other TOS Tests:** * **Halsted’s Maneuver:** Downward traction on the arm with neck hyperextension. * **Roos Test (Elevated Arm Stress Test):** The "gold standard" clinical screening where the patient opens/closes hands for 3 minutes with arms abducted. * **Clinical Presentation:** Wasting of hypothenar muscles and interossei (Gilliatt-Sumner hand) and vasomotor symptoms (Raynaud’s phenomenon).

Question 618: What percentage of circulating body fluid loss is typically within the normal compensatory mechanisms of the body?

A. 15% loss
B. 20% loss
C. 30% loss
D. 40% loss (Correct Answer)

Explanation: ### Explanation The classification of hemorrhagic shock is based on the **ATLS (Advanced Trauma Life Support)** guidelines, which categorize blood loss into four stages. **Why 40% is the correct answer:** The human body possesses remarkable compensatory mechanisms (tachycardia, peripheral vasoconstriction, and tachypnea) to maintain vital organ perfusion during acute blood loss. According to the ATLS classification, **Class III Hemorrhage** (15–30% loss) is the limit where compensation begins to fail, leading to a drop in blood pressure. However, **Class IV Hemorrhage** (>40% loss) represents the threshold of **life-threatening** exsanguination where compensatory mechanisms are maximal but exhausted. At this stage, the body can no longer maintain homeostasis without immediate massive transfusion and surgical intervention. The question identifies 40% as the critical physiological limit of these mechanisms. **Analysis of Incorrect Options:** * **A (15% loss):** This is **Class I Hemorrhage**. The body compensates so effectively that vital signs remain normal (except for slight tachycardia). * **B (20% loss):** This falls under **Class II Hemorrhage**. Compensation is achieved via increased heart rate and narrowed pulse pressure; systolic BP is still maintained. * **C (30% loss):** This is the transition into **Class III Hemorrhage**. At this point, compensatory mechanisms are no longer sufficient to maintain systolic blood pressure, and hypotension ensues. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign of Shock:** Tachycardia (except in patients on beta-blockers or with pacemakers). * **Earliest Sign of Class II Shock:** Narrowed Pulse Pressure (due to increased diastolic pressure from catecholamine release). * **Definition of Hypotension:** A drop in systolic BP is a **late sign** of shock, typically appearing only after >30% blood loss (Class III). * **Management:** Class I & II usually require crystalloids; Class III & IV require blood products and crystalloids.

Question 619: Which of the following statements concerning topical antimicrobials in common use today is/are true?

A. Of the common topical antimicrobials, only mafenide acetate is painful upon application.
B. The use of 0.5% silver nitrate is associated with trans-eschar leeching of sodium and potassium from the wound.
C. Silver sulfadiazine, mafenide acetate, and 0.5% silver nitrate all have broad-spectrum activity, however, only silver nitrate has anti-fungal activity.
D. All of the above. (Correct Answer)

Explanation: This question tests your knowledge of topical antimicrobial agents used in burn management, a high-yield topic for NEET-PG. ### **Explanation of Options** * **Option A (Mafenide Acetate):** Mafenide acetate (Sulfamylon) is unique because it is highly soluble and can penetrate thick burn eschars. However, its application is notoriously painful (burning sensation). It is also a carbonic anhydrase inhibitor, which can lead to metabolic acidosis—a classic exam fact. * **Option B (0.5% Silver Nitrate):** Silver nitrate is delivered in an aqueous solution. Because it is hypotonic, it creates a concentration gradient that leaches electrolytes (sodium, potassium, calcium, and magnesium) out of the wound, potentially leading to hyponatremia and hypokalemia. It also stains tissues and laundry black. * **Option C (Spectrum of Activity):** While all three agents cover a broad spectrum of Gram-positive and Gram-negative bacteria (including *Pseudomonas*), **Silver Nitrate** is the only one among them with significant **anti-fungal** properties. Silver sulfadiazine (the most commonly used) has poor eschar penetration and can cause transient leukopenia. Since all three statements are pharmacologically accurate, **Option D** is the correct answer. ### **High-Yield Clinical Pearls for NEET-PG** | Agent | Key Advantage | Major Disadvantage/Side Effect | | :--- | :--- | :--- | | **Silver Sulfadiazine** | Most common; painless | **Leukopenia** (transient); poor eschar penetration. | | **Mafenide Acetate** | **Best eschar penetration** | **Painful**; Metabolic acidosis (Carbonic anhydrase inhibition). | | **Silver Nitrate** | Anti-fungal activity | **Electrolyte leaching** (Hyponatremia); Black staining. | * **Rule of Thumb:** If a question mentions a burn patient with a thick eschar and subsequent respiratory compensation for metabolic acidosis, think **Mafenide Acetate**.

Question 620: An 18-year-old man presents after a motorcycle accident with a history of brief unresponsiveness. Skull films show a left temporal bone fracture. After the x-ray, he loses consciousness and develops left pupil dilation. What is the most likely diagnosis?

A. Ruptured berry aneurysm
B. Acute subdural hematoma
C. Epidural hematoma (Correct Answer)
D. Intraabdominal hemorrhage

Explanation: **Explanation:** The clinical presentation is a classic textbook description of an **Epidural Hematoma (EDH)**. The key diagnostic feature here is the **"Lucid Interval"**—a period of brief initial unconsciousness (due to concussion) followed by a temporary recovery of consciousness, and then a rapid neurological deterioration as the hematoma expands. **Why Epidural Hematoma is correct:** * **Mechanism:** Most EDHs are caused by a skull fracture (temporal bone) that lacerates the **Middle Meningeal Artery**. * **Clinical Progression:** The arterial bleed rapidly increases intracranial pressure, leading to herniation. * **Pupillary Findings:** The **ipsilateral (left) pupil dilation** is due to uncal herniation compressing the third cranial nerve (Oculomotor nerve), while the contralateral hemiparesis (if present) occurs due to pressure on the motor cortex. **Why other options are incorrect:** * **A. Ruptured berry aneurysm:** Typically presents as a Subarachnoid Hemorrhage (SAH) with a "thunderclap headache" and no history of trauma. * **B. Acute subdural hematoma:** Usually results from tearing of **bridging veins**. It is more common in elderly patients or severe deceleration injuries and typically lacks a lucid interval, presenting with a more gradual or persistently depressed level of consciousness. * **C. Intraabdominal hemorrhage:** While common in trauma, it would present with signs of hemorrhagic shock (tachycardia, hypotension) rather than focal neurological deficits like pupil dilation. **NEET-PG High-Yield Pearls:** * **Imaging Gold Standard:** Non-contrast CT (NCCT) Head shows a **Biconvex (Lentiform)**, hyperdense, lens-shaped opacity that does not cross suture lines. * **Source of Bleed:** Middle Meningeal Artery (most common) or dural venous sinuses. * **Management:** Urgent surgical evacuation via craniotomy/burr hole if the hematoma is large or causing a midline shift.

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Spinal Trauma

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Extremity Trauma

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Trauma — MCQs

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