Trauma Practice Questions

Q: CSF rhinorrhoea is commonest following a fracture to which anatomical structure?

Cribriform plate. **Explanation:** **CSF Rhinorrhoea** occurs when there is a breach in the dura mater, arachnoid mater, and the bony floor of the anterior cranial fossa, creating a communication between the subarachnoid space and the nasal cavity. **Why Cribriform Plate is Correct:** The **cribriform plate of the ethmoid bone** is the most common site for CSF rhinorrhoea. Anatomically, it is extremely thin and fragile. Furthermore, the dura mater is tightly adherent to the bone in this region, making it highly susceptible to dural tears even with minor linear fractures of the anterior cranial fossa. **Analysis of Incorrect Options:** * **Temporal bone:** Fractures here (especially petrous part) more commonly lead to **CSF Otorrhoea**. While CSF can reach the nose via the Eustachian tube (paradoxical rhinorrhoea), it is less common than direct leakage via the ethmoid. * **Nasal bones:** These are extracranial structures. Fractures of the nasal bones cause epistaxis and deformity but do not involve the dural layers unless the underlying ethmoid bone is also fractured. * **Temporo-sphenoid region:** While sphenoid sinus fractures can cause rhinorrhoea, they are statistically less frequent than ethmoid/cribriform injuries. **Clinical Pearls for NEET-PG:** 1. **Diagnosis:** The most specific biochemical test is **Beta-2 Transferrin** (highly sensitive and specific for CSF). 2. **Target Sign/Halo Sign:** On a paper or linen, CSF forms a clear outer ring around a central red spot of blood. 3. **Management:** Most cases (80%) resolve with conservative management (bed rest, head elevation, avoiding straining). If persistent, endoscopic endonasal repair is the gold standard. 4. **Imaging:** **High-Resolution CT (HRCT)** of the paranasal sinuses is the investigation of choice to locate the bony defect.

Q: Trauma to spleen in a stable patient is best diagnosed by?

CT scan. **Explanation:** The gold standard for diagnosing splenic trauma in a **hemodynamically stable** patient is a **Contrast-Enhanced Computed Tomography (CECT) scan**. **Why CT Scan is the Correct Choice:** In a stable patient, CECT provides the highest sensitivity and specificity. It allows for accurate **grading of the injury** (AAST Scale), identifies the presence of a "contrast blush" (indicating active extravasation), and evaluates the retroperitoneum and other solid organs. This information is crucial for deciding between non-operative management (NOM) and surgical intervention. **Analysis of Incorrect Options:** * **X-ray Abdomen:** This is non-specific. While it may show indirect signs like the "Ballance’s sign" or "Kehr’s sign" (referred pain), it cannot visualize parenchymal damage or grade the injury. * **USG (FAST):** Focused Assessment with Sonography for Trauma is the initial screening tool of choice for **unstable** patients. While it detects free intraperitoneal fluid (hemoperitoneum), it is operator-dependent and poor at grading specific organ injuries or detecting subcapsular hematomas. * **Diagnostic Peritoneal Lavage (DPL):** This is an invasive procedure used primarily in **unstable** patients when USG is unavailable. It is highly sensitive for blood but cannot localize the source of bleeding or grade the injury, often leading to unnecessary laparotomies. **Clinical Pearls for NEET-PG:** * **Hemodynamically Stable:** CECT is the investigation of choice. * **Hemodynamically Unstable:** FAST is the initial investigation of choice. * **Most common organ injured** in blunt trauma abdomen: Spleen (followed by Liver). * **Management Trend:** Most splenic injuries (Grades I-III) in stable patients are now managed conservatively (Non-operative management).

Q: What are the principles of treatment for a pyogenic infection of the skeletal system?

Antibiotics. **Explanation:** Pyogenic infections of the skeletal system, such as **Acute Osteomyelitis** or **Septic Arthritis**, are primarily bacterial in origin (most commonly *Staphylococcus aureus*). The cornerstone of management is the prompt administration of **intravenous antibiotics** to eradicate the pathogen, prevent bone necrosis (sequestrum formation), and avoid systemic sepsis. **Why Antibiotics is the Correct Answer:** The pathophysiology involves bacterial proliferation within the metaphysis of long bones or the joint space. Early empirical antibiotic therapy (later tailored by culture and sensitivity) is mandatory to halt the inflammatory process and prevent the transition from acute to chronic osteomyelitis. **Analysis of Incorrect Options:** * **Analgesics (A):** While important for symptomatic pain relief, they do not treat the underlying infectious etiology and are considered supportive, not definitive, therapy. * **Steroids (C):** These are generally contraindicated as they suppress the immune response, potentially worsening the infection and delaying healing. * **Non-operative management (D):** While some early cases respond to antibiotics alone, "non-operative management" is a broad term. In many cases, surgical drainage (sequestrectomy or arthrotomy) is required if there is no response to antibiotics within 48 hours or if an abscess is present. **Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus* (overall); *Salmonella* (in Sickle Cell Anemia patients). * **Initial Investigation of Choice:** MRI (most sensitive for early changes). * **Gold Standard Diagnosis:** Bone aspiration/biopsy for culture. * **Rule of Thumb:** If clinical improvement is not seen within 24–48 hours of starting antibiotics, surgical decompression/drainage is indicated.

Q: A patient presented with acute respiratory insufficiency within one week of injury. Which of the following is NOT a potential cause?

Shock lung. **Explanation:** The question asks for the condition that is **NOT** a potential cause of acute respiratory insufficiency within one week of injury. The correct answer is **Shock Lung (Option D)** because it is an outdated clinical term. **1. Why "Shock Lung" is the correct answer:** Historically, "Shock Lung" was used to describe what we now define as **Acute Respiratory Distress Syndrome (ARDS)**. In modern surgical practice and trauma classifications (such as the Berlin definition), "Shock Lung" is no longer considered a specific diagnosis or a distinct clinical entity. While ARDS itself is a major cause of respiratory failure post-trauma, the term "Shock Lung" is considered obsolete in contemporary medical literature and examinations. **2. Why the other options are incorrect (Potential causes):** * **Contusion of the lung:** This is the most common cause of respiratory failure following blunt chest trauma. It typically manifests within 24–48 hours as localized parenchymal hemorrhage and edema. * **Fat embolism:** Classically occurs 24–72 hours after long bone fractures (e.g., femur). It presents with the triad of respiratory distress, cerebral symptoms, and petechial rashes. * **Pneumothorax:** This can cause immediate or delayed respiratory insufficiency (if a simple pneumothorax progresses or is missed initially) due to lung collapse and ventilation-perfusion mismatch. **Clinical Pearls for NEET-PG:** * **ARDS Timing:** By definition, ARDS occurs within **one week** of a known clinical insult, with bilateral opacities on imaging not fully explained by effusions or heart failure. * **Fat Embolism Syndrome (FES):** Remember **Gurd’s Criteria** for diagnosis. The most common site for petechiae is the axilla and base of the neck. * **Pulmonary Contusion:** Management is supportive (analgesia and fluid restriction); avoid over-hydration as it worsens the contusion.

Q: A patient with burns presents to the emergency room and has started on intravenous fluids. What is the best method to assess the adequacy of volume replacement?

Urine output. **Explanation:** In the management of acute burn injury, the primary goal of fluid resuscitation is to maintain end-organ perfusion while avoiding fluid overload. **Why Urine Output (UOP) is the Correct Answer:** Urine output is considered the **most reliable, non-invasive, and sensitive clinical indicator** of visceral organ perfusion and cardiac output in burn patients. It reflects the adequacy of renal blood flow, which serves as a proxy for overall tissue perfusion. * **Target UOP for Adults:** 0.5 ml/kg/hr (or approx. 30–50 ml/hr). * **Target UOP for Children (<30kg):** 1 ml/kg/hr. * **Target UOP for Electrical Burns:** 75–100 ml/hr (to prevent acute tubular necrosis from myoglobinuria). **Why Other Options are Incorrect:** * **Pulse Rate & Systolic BP:** These are unreliable in the early stages of burns. The massive release of catecholamines (stress response) causes tachycardia and peripheral vasoconstriction, which may maintain blood pressure even in a state of significant hypovolemia. * **Central Venous Pressure (CVP):** While CVP measures right atrial pressure, it is an invasive procedure and does not always correlate with total intravascular volume in burn patients due to changes in pulmonary vascular resistance and chest wall compliance (especially in circumferential chest burns). **High-Yield Clinical Pearls for NEET-PG:** * **Parkland Formula:** 4 ml × TBSA% × Weight (kg). Give half in the first 8 hours and the remainder over the next 16 hours. * **Fluid of Choice:** Ringer’s Lactate (Isotonic crystalloid). * **Baxter’s Formula:** Same as Parkland but uses 4ml/kg/%. * **Modified Brooke Formula:** Uses 2ml/kg/%. * **Rule of 10s:** A simplified method for initial fluid rates: (TBSA% × 10) for patients 40–80 kg.

Q: Which fluid is commonly used for initial resuscitation in hypovolemic shock?

Ringer's Lactate. **Explanation:** In the management of hypovolemic shock, the primary goal of initial resuscitation is to restore intravascular volume and improve tissue perfusion. **Ringer’s Lactate (RL)** is the preferred choice (as per ATLS guidelines) because it is an isotonic crystalloid with an electrolyte composition that closely mimics human plasma. Unlike normal saline, RL contains lactate, which is metabolized by the liver into bicarbonate, helping to buffer the metabolic acidosis often associated with shock. **Analysis of Options:** * **0.9% Sodium Chloride (Normal Saline):** While isotonic and frequently used, it contains a supra-physiological concentration of chloride (154 mEq/L). Large volumes can lead to **hyperchloremic metabolic acidosis**, which can worsen the patient's acid-base status. * **Whole Blood:** This is not used for *initial* resuscitation. Crystalloids are started first while blood is being cross-matched. Blood products are indicated if the patient remains hemodynamically unstable after 1–2 liters of crystalloids (Class III/IV hemorrhage). * **5% Dextrose in Water (D5W):** This is a hypotonic solution once the glucose is metabolized. It rapidly leaves the intravascular space and enters the intracellular compartment, making it ineffective for volume expansion and potentially causing cerebral edema. **Clinical Pearls for NEET-PG:** * **Standard Initial Bolus:** 1 Liter of warmed isotonic crystalloid for adults (20 ml/kg for pediatrics). * **Balanced Salt Solutions:** RL and Plasmalyte are preferred over Normal Saline to prevent "Resuscitation-induced Hyperchloremia." * **Lactate Metabolism:** RL is contraindicated in patients with severe liver failure (who cannot metabolize lactate) or those receiving blood transfusions through the same line (calcium in RL may cause clotting).

Question 1

CSF rhinorrhoea is commonest following a fracture to which anatomical structure?

Accepted Answer

Cribriform plate

Answer

Temporal bone

Answer

Nasal bones

Answer

Temporo-sphenoid region

Question 2

Which of the following investigations is/are true regarding rupture of the diaphragm?

Accepted Answer

Chest X-ray, Repair by laparotomy, Laparoscopy

Answer

Diagnostic peritoneal lavage (DPL), Repair by laparotomy, Laparoscopy

Answer

Chest X-ray, Repair by laparotomy

Answer

Chest X-ray, Diagnostic peritoneal lavage (DPL)

Question 3

Penetrating neck trauma is defined as injury violating which structure?

Accepted Answer

Violating the platysma

Answer

2 cm deep

Answer

Damaging a vital structure

Answer

Injury by a sharp object

Question 4

What is true regarding 'Damage control surgery'?

Accepted Answer

Minimal intervention to stabilize the patient for later definitive surgery

Answer

Performed during a critical event

Answer

Performed during patient triage

Answer

Maximum possible surgical intervention considering the event

Question 5

Trauma to spleen in a stable patient is best diagnosed by?

Accepted Answer

CT scan

Answer

X-ray abdomen

Answer

USG

Answer

Diagnostic peritoneal lavage

Question 6

What are the principles of treatment for a pyogenic infection of the skeletal system?

Accepted Answer

Antibiotics

Answer

Analgesics

Answer

Steroids

Answer

Non-operative management

Question 7

A patient presented with acute respiratory insufficiency within one week of injury. Which of the following is NOT a potential cause?

Accepted Answer

Shock lung

Answer

Contusion of the lung

Answer

Fat embolism

Answer

Pneumothorax

Question 8

A patient with burns presents to the emergency room and has started on intravenous fluids. What is the best method to assess the adequacy of volume replacement?

Accepted Answer

Urine output

Answer

Pulse rate

Answer

Systolic blood pressure

Answer

Central venous pressure

Question 9

Which fluid is commonly used for initial resuscitation in hypovolemic shock?

Accepted Answer

Ringer's Lactate

Answer

0.9% Sodium Chloride

Answer

Whole Blood

Answer

5% Dextrose in Water

Question 10

A 26-year-old man is stabbed in the right intercostal space in the midclavicular line and presents to the emergency department. On examination, subcutaneous emphysema of the right chest wall, absent breath sounds, and a trachea shifted to the left are noted. What is the most likely serious diagnosis?

Accepted Answer

Tension pneumothorax

Answer

Pneumothorax

Answer

Massive hemothorax

Answer

Hemopneumothorax

Trauma — MCQs

Trauma — MCQs

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