Trauma — MCQs

A patient who sustained a traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. On the 3rd postoperative day, he develops chest pain and collapses. Examination reveals a fine petechial rash over the trunk, tachycardia, tachypnea, and hypotension. Chest X-ray shows dilatation of the right-sided heart and diffuse lung infiltrates. What is the most likely cause of this condition?

Q65Easy

Which of the following is/are a method for measuring blood loss?

Q66Medium

What investigation should be performed immediately in an unstable patient presenting with blunt abdominal trauma?

Q67Medium

In the pediatric age group, what is the most common feature of polytrauma?

Q68Easy

Following traumatic peripheral nerve transection, at what rate does regrowth usually occur?

Q69Medium

A young male is brought unconscious to the hospital with external injuries. CT brain showed no midline shift but multiple tiny hemorrhages in the brain. What is the likely diagnosis?

Q70Easy

Multi-organ failure is defined as failure of a minimum of how many organs?

Trauma Indian Medical PG Practice Questions and MCQs

Question 61: What is the first fluid of choice in hypovolemic shock?

A. Dextran
B. Normal saline (Correct Answer)
C. Dextrose normal saline
D. Hartmann solution

Explanation: **Explanation:** In the management of hypovolemic shock, the primary goal is rapid volume expansion to restore tissue perfusion. **Normal Saline (0.9% NaCl)** is considered the first fluid of choice because it is an isotonic crystalloid that is readily available, inexpensive, and compatible with blood products. While Ringer’s Lactate (Hartmann solution) is often preferred for large-volume resuscitation to avoid hyperchloremic metabolic acidosis, Normal Saline remains the standard initial answer in many classic surgical guidelines and trauma protocols (like early ATLS versions) for immediate resuscitation. **Analysis of Options:** * **Normal Saline (Correct):** An isotonic crystalloid that remains in the intravascular compartment long enough to stabilize hemodynamics. It is the safest initial choice when the specific nature of the fluid loss is unknown. * **Dextran (Incorrect):** This is a colloid. While colloids expand volume effectively, they are not first-line due to risks of anaphylaxis, coagulopathy, and acute kidney injury. * **Dextrose Normal Saline (Incorrect):** Hypertonic or glucose-containing fluids are avoided in shock. Dextrose is rapidly metabolized, leaving free water which shifts into the intracellular space, potentially causing cellular edema (especially cerebral edema) rather than maintaining intravascular volume. * **Hartmann Solution (Incorrect):** Also known as Ringer’s Lactate. While it is more "physiological" than NS, in many examination contexts, NS is still cited as the universal starting point. Note: Modern ATLS (10th ed) emphasizes balanced crystalloids, but NS remains a standard "first" answer. **High-Yield Clinical Pearls for NEET-PG:** 1. **The 3:1 Rule:** For every 1 mL of blood lost, 3 mL of crystalloid is required (as 75% of crystalloid shifts to the interstitial space within 30-60 mins). 2. **Lethal Triad of Trauma:** Acidosis, Coagulopathy, and Hypothermia. 3. **Fluid of choice in Burns:** Ringer’s Lactate (Parkland Formula). 4. **Permissive Hypotension:** In non-compressible torso hemorrhage, aim for a systolic BP of 80-90 mmHg to prevent "popping the clot" until surgical control is achieved.

Question 62: What is the normal cerebral blood flow per 100 grams of brain tissue?

A. 45 ml/min
B. 55 ml/min (Correct Answer)
C. 65 ml/min
D. 75 ml/min

Explanation: **Explanation:** The correct answer is **55 ml/min** (Option B). Cerebral Blood Flow (CBF) is a critical parameter in neurotrauma management, representing the volume of blood delivered to the brain per unit of time. In a healthy adult, the average CBF is approximately **50 to 55 ml per 100 grams of brain tissue per minute**. This flow is tightly regulated by **autoregulation**, ensuring constant perfusion despite fluctuations in Mean Arterial Pressure (MAP) between 50 and 150 mmHg. **Analysis of Options:** * **Option A (45 ml/min):** While close, this is slightly below the standard physiological average. However, it is important to note that gray matter receives higher flow (~70-80 ml) than white matter (~20 ml). * **Option B (55 ml/min):** This is the standard textbook value for global CBF used in surgical and physiological examinations. * **Options C & D (65-75 ml/min):** These values represent hyperperfusion or luxury perfusion, which is not the baseline physiological state for the entire brain. **Clinical Pearls for NEET-PG:** * **Critical Thresholds:** * **Ischemic Penumbra:** CBF < 20 ml/100g/min (functional impairment occurs). * **Irreversible Infarction:** CBF < 10 ml/100g/min (cell death/ionic pump failure). * **Cerebral Perfusion Pressure (CPP):** Calculated as **MAP – ICP**. In trauma management (ATLS/BTF guidelines), the goal is to maintain CPP between **60–70 mmHg**. * **Chemical Regulation:** CBF is most sensitive to **PaCO₂**. Hyperventilation causes hypocapnia, leading to cerebral vasoconstriction and a subsequent decrease in ICP—a high-yield maneuver for acute herniation.

Question 63: A 40-year-old male patient sustained a head injury after being hit by a car and was brought to the casualty. On examination, the patient is drowsy, aphasic, opens eyes on deep pain stimulus, and withdraws from pain stimulus. What is his Glasgow Coma Scale (GCS) score?

A. 8
B. 7 (Correct Answer)
C. 6
D. 10

Explanation: ### Explanation The Glasgow Coma Scale (GCS) is a clinical tool used to assess the level of consciousness based on three parameters: Eye opening (E), Verbal response (V), and Motor response (M). The total score ranges from 3 to 15. **Breakdown of this patient’s GCS:** * **Eye Opening (E):** The patient opens eyes only on "deep pain stimulus." This corresponds to **E2**. (E1: None, E2: To pain, E3: To sound, E4: Spontaneous). * **Verbal Response (V):** The patient is "aphasic" (unable to produce speech). In the context of trauma assessment, no verbal output corresponds to **V1**. (V1: None, V2: Incomprehensible sounds, V3: Inappropriate words, V4: Confused, V5: Oriented). * **Motor Response (M):** The patient "withdraws from pain stimulus." This corresponds to **M4**. (M1: None, M2: Extension/Decerebrate, M3: Abnormal flexion/Decorticate, M4: Withdrawal, M5: Localizes pain, M6: Obeys commands). **Total GCS = E2 + V1 + M4 = 7.** #### Analysis of Incorrect Options: * **Option A (8):** Incorrect calculation; likely misinterpreting "aphasic" as "incomprehensible sounds" (V2) or eye-opening to speech (E3). * **Option C (6):** Incorrect calculation; likely under-scoring the motor response (M3 instead of M4). * **Option D (10):** Incorrect calculation; suggests a much higher level of consciousness (e.g., E3, V3, M4). #### Clinical Pearls for NEET-PG: * **Severity Classification:** GCS 13–15 (Mild), 9–12 (Moderate), **≤8 (Severe head injury)**. * **Management Rule:** "GCS of 8, Intubate!" (Patients with a score of 8 or less usually require definitive airway protection). * **Most Important Component:** The **Motor score** is the most reliable predictor of clinical outcome. * **Note on Aphasia:** If a patient is intubated, the verbal score is recorded as **1T**.

Question 64: A patient who sustained a traffic accident undergoes emergency open reduction and internal fixation for a pelvic fracture. He recovers well during the postoperative period. On the 3rd postoperative day, he develops chest pain and collapses. Examination reveals a fine petechial rash over the trunk, tachycardia, tachypnea, and hypotension. Chest X-ray shows dilatation of the right-sided heart and diffuse lung infiltrates. What is the most likely cause of this condition?

A. Fat embolism (Correct Answer)
B. Pneumonia
C. Pneumothorax
D. Pericarditis

Explanation: ### Explanation The correct answer is **Fat Embolism (Option A)**. **Why it is correct:** Fat Embolism Syndrome (FES) typically occurs 24–72 hours after a long bone or pelvic fracture. The pathophysiology involves the release of bone marrow fat into the systemic circulation (Mechanical Theory) and the subsequent inflammatory response to free fatty acids (Biochemical Theory). The patient presents with the classic **Gurd’s Triad**: 1. **Respiratory distress:** Tachypnea, dyspnea, and diffuse lung infiltrates (Snowstorm appearance). 2. **Neurological symptoms:** (Though not mentioned here, often includes confusion/seizures). 3. **Dermatological signs:** A pathognomonic **petechial rash** (usually over the chest, axilla, and conjunctiva) due to capillary rupture. The right-sided heart dilatation on X-ray/ECG indicates acute cor pulmonale due to sudden pulmonary vascular obstruction. **Why incorrect options are wrong:** * **Pneumonia (Option B):** While it causes infiltrates and tachypnea, it usually presents with fever and productive cough, and it would not explain the petechial rash or sudden cardiovascular collapse. * **Pneumothorax (Option C):** This would present with absent breath sounds and hyper-resonance on the affected side, not diffuse infiltrates or a petechial rash. * **Pericarditis (Option D):** This presents with pleuritic chest pain and friction rub, but not with pulmonary infiltrates or a petechial rash. **NEET-PG High-Yield Pearls:** * **Most common cause:** Long bone fractures (Femur > Tibia > Pelvis). * **Pathognomonic sign:** Petechial rash (present in only 20-50% of cases but highly specific). * **Diagnosis:** Primarily clinical (Gurd’s Criteria). * **Treatment:** Mainly supportive (Oxygenation/Ventilation). Early fixation of fractures is the best preventive measure. * **Schonfeld’s Criteria:** A scoring system used for FES; a score >5 is diagnostic.

Question 65: Which of the following is/are a method for measuring blood loss?

A. Weighing swabs
B. Measurement of swelling in closed fractures
C. Measurement of blood clot
D. All of the above (Correct Answer)

Explanation: **Explanation:** Accurate estimation of blood loss is critical in trauma and surgical settings to guide fluid resuscitation and prevent hemorrhagic shock. The correct answer is **D (All of the above)** because each option represents a validated clinical method for quantifying blood loss. 1. **Weighing Swabs (Option A):** This is a standard intraoperative technique. By subtracting the known dry weight of a surgical swab from its weight when soaked with blood (1 gram ≈ 1 mL), clinicians can estimate blood loss. However, this may underestimate loss due to evaporation or overestimate it if irrigation fluid is present. 2. **Measurement of Swelling in Closed Fractures (Option B):** In trauma, significant occult bleeding occurs into soft tissues. For example, a closed femoral shaft fracture can result in 1–1.5 liters of blood loss, visible as an increase in thigh circumference. Clinical formulas use the limb's volume increase to estimate this "hidden" loss. 3. **Measurement of Blood Clot (Option C):** The size of a blood clot can provide a rough bedside estimate. A clot the size of a closed fist is approximately equal to **500 mL** of blood. **Why other options are not "wrong":** In a "Multiple Correct" or "All of the above" format, if more than one method is clinically recognized, the collective option is the most accurate choice. **High-Yield Clinical Pearls for NEET-PG:** * **The "Fist" Rule:** 1 fist-sized clot ≈ 500 mL blood. * **Fracture Blood Loss Estimates:** * Rib: 125 mL * Radius/Ulna: 250–500 mL * Humerus: 500–750 mL * Tibia/Fibula: 500–1000 mL * **Femur: 1000–1500 mL** * **Pelvis: 1500–3000+ mL (Life-threatening)** * **Class of Shock:** Remember that clinical signs (tachycardia, hypotension) usually manifest only after >15-30% of blood volume is lost (Class II/III Shock).

Question 66: What investigation should be performed immediately in an unstable patient presenting with blunt abdominal trauma?

A. Ultrasound (USG) (Correct Answer)
B. CT Scan
C. Complete Hemogram
D. Abdominal X-ray

Explanation: In the management of blunt abdominal trauma (BAT), the choice of investigation is primarily dictated by the patient's **hemodynamic stability**. ### Why Ultrasound (USG) is Correct For an **unstable patient**, the immediate goal is to identify life-threatening intra-abdominal hemorrhage rapidly without moving the patient from the resuscitation area. **FAST (Focused Assessment with Sonography for Trauma)** is the investigation of choice. It is a bedside, non-invasive, and rapid tool used to detect free intraperitoneal fluid (blood) in four areas: Morrison’s pouch (RUQ), splenorenal recess (LUQ), pelvis (Pouch of Douglas), and the pericardium. A positive FAST in an unstable patient is an indication for immediate laparotomy. ### Why Other Options are Incorrect * **B. CT Scan:** This is the "Gold Standard" for diagnosing solid organ injuries. However, it requires the patient to be **hemodynamically stable** because it is time-consuming and requires moving the patient to the radiology suite ("Death in the Donut"). * **C. Complete Hemogram:** While important for baseline data, hemoglobin levels may not drop immediately after acute hemorrhage due to compensatory mechanisms; it is not a diagnostic tool for acute trauma. * **D. Abdominal X-ray:** It has very limited utility in blunt trauma. While it may show pneumoperitoneum in hollow viscus injury, it cannot detect hemorrhage or solid organ injury effectively. ### High-Yield Clinical Pearls for NEET-PG * **Hemodynamically Unstable + Positive FAST** = Proceed to Emergency Laparotomy. * **Hemodynamically Stable + Positive FAST** = Proceed to Contrast-Enhanced CT (CECT) to grade the injury. * **DPL (Diagnostic Peritoneal Lavage)** is an alternative to FAST in unstable patients if USG is unavailable, but it is invasive and cannot detect retroperitoneal bleeds. * **Most common organ injured in BAT:** Spleen. * **Most common organ injured in penetrating trauma:** Small Intestine.

Question 67: In the pediatric age group, what is the most common feature of polytrauma?

A. Hypothermia (Correct Answer)
B. Hypotension
C. Hypovolemic shock
D. Hypoxemia

Explanation: ### Explanation **Correct Answer: A. Hypothermia** In pediatric polytrauma, **hypothermia** is the most common and significant physiological derangement. This is primarily due to the unique anatomical and physiological characteristics of children: 1. **High Surface Area to Volume Ratio:** Children have a larger body surface area relative to their mass, leading to rapid heat loss. 2. **Thin Subcutaneous Fat:** They lack the insulating fat layer found in adults. 3. **Limited Thermogenesis:** Children have a limited ability to generate heat through shivering and rely on non-shivering thermogenesis (brown fat metabolism), which is easily exhausted during stress. Hypothermia is a critical component of the "Pediatric Lethal Triad" (Hypothermia, Acidosis, and Coagulopathy). **Why the other options are incorrect:** * **B. Hypotension:** This is a **late sign** in pediatric trauma. Children have a very efficient compensatory mechanism (vasoconstriction and tachycardia) and can maintain a normal blood pressure even after losing up to 30-35% of their circulating blood volume. * **C. Hypovolemic shock:** While common, it is often "compensated" in the initial stages. It is a consequence of injury rather than a universal physiological feature as ubiquitous as heat loss. * **D. Hypoxemia:** While a major cause of secondary brain injury and cardiac arrest, it is usually secondary to airway obstruction or thoracic trauma, whereas hypothermia occurs globally in almost all significant pediatric trauma cases due to exposure and resuscitation. **High-Yield Clinical Pearls for NEET-PG:** * **The "Golden Hour"** in pediatrics is even more critical due to rapid physiological decompensation. * **Hypotension = Decompensation:** By the time a child becomes hypotensive, they are in a state of "uncompensated shock," representing a near-terminal event. * **Management:** Aggressive warming (warmed IV fluids, overhead heaters, and increased room temperature) is a priority in the primary survey (Environment control). * **Blood Volume:** Estimated at **80 mL/kg** in children.

Question 68: Following traumatic peripheral nerve transection, at what rate does regrowth usually occur?

A. 0.1 mm per day
B. 1 mm per day (Correct Answer)
C. 5 mm per day
D. 1 cm per day

Explanation: ### Explanation **1. The Correct Answer: B (1 mm per day)** Following a peripheral nerve transection, the distal segment undergoes **Wallerian degeneration**. Regeneration begins from the proximal stump through a process where axonal sprouts grow toward the distal endoneurial tubes. In clinical practice, the average rate of axonal regeneration is approximately **1 mm per day** (or roughly 1 inch per month). This rate is influenced by the metabolic activity of the cell body and the distance the axon must travel. **2. Analysis of Incorrect Options** * **Option A (0.1 mm per day):** This is significantly slower than the physiological rate of axonal transport and regeneration. Such a slow rate would mean a nerve injury at the shoulder would take decades to reach the hand. * **Option C (5 mm per day):** This is an overestimation. While regeneration can be slightly faster in children or in very proximal injuries, it rarely exceeds 2–3 mm per day and never reaches a sustained 5 mm. * **Option D (1 cm per day):** This is physiologically impossible for human peripheral nerves. Rapid growth at this scale does not occur in mammalian neural tissue. **3. High-Yield Clinical Pearls for NEET-PG** * **Tinel’s Sign:** This is a crucial clinical tool used to track recovery. A positive Tinel’s sign (paresthesia on percussion) that moves distally over time indicates active axonal regeneration at the expected rate of 1 mm/day. * **Seddon’s Classification:** * *Neuropraxia:* Temporary conduction block; recovery is rapid (days to weeks). * *Axonotmesis:* Axon damaged but sheath intact; regenerates at **1 mm/day**. * *Neurotmesis:* Complete transection; requires surgical repair for any hope of regeneration. * **Prognosis:** Recovery is better in distal injuries compared to proximal ones because the "time-clock" for motor end-plate viability is limited (usually 12–18 months). If the nerve doesn't reach the muscle within this window, permanent atrophy occurs.

Question 69: A young male is brought unconscious to the hospital with external injuries. CT brain showed no midline shift but multiple tiny hemorrhages in the brain. What is the likely diagnosis?

A. Cerebral contusion
B. Cerebral laceration
C. Multiple infarcts
D. Diffuse axonal injuries (Correct Answer)

Explanation: **Explanation:** **Diffuse Axonal Injury (DAI)** is the most likely diagnosis. It occurs due to high-velocity rotational acceleration-deceleration forces (e.g., RTA), causing shearing of axons at the interface of tissues with different densities. 1. **Why it is correct:** The clinical hallmark of DAI is a patient who is **unconscious** (low GCS) immediately following trauma, but whose **CT scan appears disproportionately normal** or shows no midline shift. Characteristic CT/MRI findings include **multiple punctate (tiny) hemorrhages** at the grey-white matter junction, corpus callosum, or brainstem. While CT is often the first investigation, **MRI (specifically Susceptibility Weighted Imaging - SWI)** is the gold standard for diagnosis. 2. **Why other options are incorrect:** * **Cerebral Contusion:** These are "bruises" of the brain, usually seen as "salt and pepper" appearance (heterogeneous areas of hemorrhage and edema) on CT, typically located at the poles (frontal/temporal) due to coup-contrecoup injuries. * **Cerebral Laceration:** Involves a physical tear in the brain tissue, usually associated with depressed skull fractures or penetrating trauma; it would show significant focal damage on CT. * **Multiple Infarcts:** These follow a vascular distribution and are typically seen in embolic events or elderly patients, not acutely following trauma in a young male. **High-Yield Pearls for NEET-PG:** * **Most common site for DAI:** Grey-white matter junction (Grade I), followed by Corpus Callosum (Grade II) and Brainstem (Grade III). * **Imaging of choice:** MRI (SWI or Gradient Echo sequences) is more sensitive than CT. * **Prognosis:** Often poor; it is a leading cause of persistent vegetative state after trauma.

Question 70: Multi-organ failure is defined as failure of a minimum of how many organs?

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

Explanation: **Explanation:** **Multi-Organ Dysfunction Syndrome (MODS)**, formerly known as Multiple Organ Failure (MOF), is a clinical condition characterized by the progressive dysfunction of two or more organ systems in an acutely ill patient, such that homeostasis cannot be maintained without therapeutic intervention. 1. **Why Option A is Correct:** By definition, the involvement of a **minimum of 2 organ systems** (e.g., respiratory failure requiring ventilation and renal failure requiring dialysis) qualifies as multi-organ failure. The condition represents a continuum of physiological insult rather than a single event, often triggered by sepsis, major trauma, or severe burns. 2. **Why Options B, C, and D are Incorrect:** While MODS can certainly involve 3, 4, or 5 organs, these numbers represent the *severity* or *progression* of the syndrome rather than the diagnostic threshold. As the number of failing organs increases, the mortality rate rises exponentially (e.g., failure of 3+ organs for more than 4 days is associated with a mortality rate approaching 90-100%). **High-Yield Clinical Pearls for NEET-PG:** * **Primary MODS:** Occurs as a direct result of a specific insult (e.g., pulmonary contusion causing respiratory failure). * **Secondary MODS:** Occurs as a result of the host’s systemic inflammatory response (SIRS) to an insult, affecting organs distant from the original injury. * **Scoring Systems:** The **SOFA (Sequential Organ Failure Assessment)** score and the **APACHE II** score are the most commonly used tools in the ICU to quantify the degree of organ dysfunction and predict mortality. * **Common Sequence:** In post-traumatic MODS, the lungs are typically the first organ to fail (ARDS), followed by the liver, kidneys, and gastrointestinal tract.

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